// This file was generated by libdot/bin/concat.sh.
// It has been marked read-only for your safety.  Rather
// than edit it directly, please modify one of these source
// files...
//
// hterm/js/hterm.js
// hterm/js/hterm_frame.js
// hterm/js/hterm_keyboard.js
// hterm/js/hterm_keyboard_keymap.js
// hterm/js/hterm_options.js
// hterm/js/hterm_preference_manager.js
// hterm/js/hterm_pubsub.js
// hterm/js/hterm_screen.js
// hterm/js/hterm_scrollport.js
// hterm/js/hterm_terminal.js
// hterm/js/hterm_terminal_io.js
// hterm/js/hterm_text_attributes.js
// hterm/js/hterm_vt.js
// hterm/js/hterm_vt_character_map.js
//

// SOURCE FILE: hterm/js/hterm.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.fs', 'lib.Storage');

/**
 * @fileoverview Declares the hterm.* namespace and some basic shared utilities
 * that are too small to deserve dedicated files.
 */
var hterm = {};

/**
 * The type of window hosting hterm.
 *
 * This is set as part of hterm.init().  The value is invalid until
 * initialization completes.
 */
hterm.windowType = null;

/**
 * Warning message to display in the terminal when browser zoom is enabled.
 *
 * You can replace it with your own localized message.
 */
hterm.zoomWarningMessage = 'ZOOM != 100%';

/**
 * Brief overlay message displayed when text is copied to the clipboard.
 *
 * By default it is the unicode BLACK SCISSORS character, but you can
 * replace it with your own localized message.
 *
 * This is only displayed when the 'enable-clipboard-notice' preference
 * is enabled.
 */
hterm.notifyCopyMessage = '\u2702';

/**
 * List of known hterm test suites.
 *
 * A test harness should ensure that they all exist before running.
 */
hterm.testDeps = ['hterm.ScrollPort.Tests', 'hterm.Screen.Tests',
                  'hterm.Terminal.Tests', 'hterm.VT.Tests',
                  'hterm.VT.CannedTests'];

/**
 * The hterm init function, registered with lib.registerInit().
 *
 * This is called during lib.init().
 *
 * @param {function} onInit The function lib.init() wants us to invoke when
 *     initialization is complete.
 */
lib.registerInit('hterm', function(onInit) {
  function onWindow(window) {
    hterm.windowType = window.type;
    setTimeout(onInit, 0);
  }

  function onTab(tab) {
    if (tab) {
      chrome.windows.get(tab.windowId, null, onWindow);
    } else {
      // TODO(rginda): This is where we end up for a v1 app's background page.
      // Maybe windowType = 'none' would be more appropriate, or something.
      hterm.windowType = 'normal';
      setTimeout(onInit, 0);
    }
  }

  if (!hterm.defaultStorage) {
    var ary = navigator.userAgent.match(/\sChrome\/(\d\d)/);
    var version = parseInt(ary[1]);
    if (chrome.storage && chrome.storage.sync && version > 21) {
      hterm.defaultStorage = new lib.Storage.Chrome(chrome.storage.sync);
    } else {
      hterm.defaultStorage = new lib.Storage.Local();
    }
  }

  // The chrome.tabs API is not supported in packaged apps, and detecting if
  // you're a packaged app is a little awkward.
  var isPackagedApp = false;
  if (chrome && chrome.runtime && chrome.runtime.getManifest) {
    var manifest = chrome.runtime.getManifest();
    var isPackagedApp = manifest.app && manifest.app.background;
  }

  if (isPackagedApp) {
    // Packaged apps are never displayed in browser tabs.
    setTimeout(onWindow.bind(null, {type: 'popup'}), 0);
  } else {
    if (chrome && chrome.tabs) {
      // The getCurrent method gets the tab that is "currently running", not the
      // topmost or focused tab.
      chrome.tabs.getCurrent(onTab);
    } else {
      setTimeout(onWindow.bind(null, {type: 'normal'}), 0);
    }
  }
});

/**
 * Return decimal { width, height } for a given dom node.
 */
hterm.getClientSize = function(dom) {
  return dom.getBoundingClientRect();
};

/**
 * Return decimal width for a given dom node.
 */
hterm.getClientWidth = function(dom) {
  return dom.getBoundingClientRect().width;
};

/**
 * Return decimal height for a given dom node.
 */
hterm.getClientHeight = function(dom) {
  return dom.getBoundingClientRect().height;
};

/**
 * Copy the current selection to the system clipboard.
 *
 * @param {HTMLDocument} The document with the selection to copy.
 */
hterm.copySelectionToClipboard = function(document) {
  document.execCommand('copy');
};

/**
 * Paste the system clipboard into the element with focus.
 *
 * @param {HTMLDocument} The document to paste into.
 */
hterm.pasteFromClipboard = function(document) {
  document.execCommand('paste');
};

/**
 * Constructor for a hterm.Size record.
 *
 * Instances of this class have public read/write members for width and height.
 *
 * @param {integer} width The width of this record.
 * @param {integer} height The height of this record.
 */
hterm.Size = function(width, height) {
  this.width = width;
  this.height = height;
};

/**
 * Adjust the width and height of this record.
 *
 * @param {integer} width The new width of this record.
 * @param {integer} height The new height of this record.
 */
hterm.Size.prototype.resize = function(width, height) {
  this.width = width;
  this.height = height;
};

/**
 * Return a copy of this record.
 *
 * @return {hterm.Size} A new hterm.Size instance with the same width and
 * height.
 */
hterm.Size.prototype.clone = function() {
  return new hterm.Size(this.width, this.height);
};

/**
 * Set the height and width of this instance based on another hterm.Size.
 *
 * @param {hterm.Size} that The object to copy from.
 */
hterm.Size.prototype.setTo = function(that) {
  this.width = that.width;
  this.height = that.height;
};

/**
 * Test if another hterm.Size instance is equal to this one.
 *
 * @param {hterm.Size} that The other hterm.Size instance.
 * @return {boolen} True if both instances have the same width/height, false
 *     otherwise.
 */
hterm.Size.prototype.equals = function(that) {
  return this.width == that.width && this.height == that.height;
};

/**
 * Return a string representation of this instance.
 *
 * @return {string} A string that identifies the width and height of this
 *     instance.
 */
hterm.Size.prototype.toString = function() {
  return '[hterm.Size: ' + this.width + ', ' + this.height + ']';
};

/**
 * Constructor for a hterm.RowCol record.
 *
 * Instances of this class have public read/write members for row and column.
 *
 * This class includes an 'overflow' bit which is use to indicate that the an
 * attempt has been made to move the cursor column passed the end of the
 * screen.  When this happens we leave the cursor column set to the last column
 * of the screen but set the overflow bit.  In this state cursor movement
 * happens normally, but any attempt to print new characters causes a cr/lf
 * first.
 *
 * @param {integer} row The row of this record.
 * @param {integer} column The column of this record.
 * @param {boolean} opt_overflow Optional boolean indicating that the RowCol
 *     has overflowed.
 */
hterm.RowCol = function(row, column, opt_overflow) {
  this.row = row;
  this.column = column;
  this.overflow = !!opt_overflow;
};

/**
 * Adjust the row and column of this record.
 *
 * @param {integer} row The new row of this record.
 * @param {integer} column The new column of this record.
 * @param {boolean} opt_overflow Optional boolean indicating that the RowCol
 *     has overflowed.
 */
hterm.RowCol.prototype.move = function(row, column, opt_overflow) {
  this.row = row;
  this.column = column;
  this.overflow = !!opt_overflow;
};

/**
 * Return a copy of this record.
 *
 * @return {hterm.RowCol} A new hterm.RowCol instance with the same row and
 * column.
 */
hterm.RowCol.prototype.clone = function() {
  return new hterm.RowCol(this.row, this.column, this.overflow);
};

/**
 * Set the row and column of this instance based on another hterm.RowCol.
 *
 * @param {hterm.RowCol} that The object to copy from.
 */
hterm.RowCol.prototype.setTo = function(that) {
  this.row = that.row;
  this.column = that.column;
  this.overflow = that.overflow;
};

/**
 * Test if another hterm.RowCol instance is equal to this one.
 *
 * @param {hterm.RowCol} that The other hterm.RowCol instance.
 * @return {boolen} True if both instances have the same row/column, false
 *     otherwise.
 */
hterm.RowCol.prototype.equals = function(that) {
  return (this.row == that.row && this.column == that.column &&
          this.overflow == that.overflow);
};

/**
 * Return a string representation of this instance.
 *
 * @return {string} A string that identifies the row and column of this
 *     instance.
 */
hterm.RowCol.prototype.toString = function() {
  return ('[hterm.RowCol: ' + this.row + ', ' + this.column + ', ' +
          this.overflow + ']');
};
// SOURCE FILE: hterm/js/hterm_frame.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.f');

/**
 * First draft of the interface between the terminal and a third party dialog.
 *
 * This is rough.  It's just the terminal->dialog layer.  To complete things
 * we'll also need a command->terminal layer.  That will have to facilitate
 * command->terminal->dialog or direct command->dialog communication.
 *
 * I imagine this class will change significantly when that happens.
 */

/**
 * Construct a new frame for the given terminal.
 *
 * @param terminal {hterm.Terminal} The parent terminal object.
 * @param url {String} The url to load in the frame.
 * @param opt_options {Object} Optional options for the frame.  Not implemented.
 */
hterm.Frame = function(terminal, url, opt_options) {
  this.terminal_ = terminal;
  this.div_ = terminal.div_;
  this.url = url;
  this.options = opt_options || {};
  this.iframe_ = null;
  this.container_ = null;
  this.messageChannel_ = null;
};

/**
 * Handle messages from the iframe.
 */
hterm.Frame.prototype.onMessage_ = function(e) {
  if (e.data.name != 'ipc-init-ok') {
    console.log('Unknown message from frame:', e.data);
    return;
  }

  this.sendTerminalInfo_();
  this.messageChannel_.port1.onmessage = this.onMessage.bind(this);
  this.onLoad();
};

/**
 * Clients could override this, I guess.
 *
 * It doesn't support multiple listeners, but I'm not sure that would make sense
 * here.  It's probably better to speak directly to our parents.
 */
hterm.Frame.prototype.onMessage = function() {};

/**
 * Handle iframe onLoad event.
 */
hterm.Frame.prototype.onLoad_ = function() {
  this.messageChannel_ = new MessageChannel();
  this.messageChannel_.port1.onmessage = this.onMessage_.bind(this);
  this.messageChannel_.port1.start();
  this.iframe_.contentWindow.postMessage(
      {name: 'ipc-init', argv: [{messagePort: this.messageChannel_.port2}]},
      [this.messageChannel_.port2], this.url);
};

/**
 * Clients may override this.
 */
hterm.Frame.prototype.onLoad = function() {};

/**
 * Sends the terminal-info message to the iframe.
 */
hterm.Frame.prototype.sendTerminalInfo_ = function() {
  lib.f.getAcceptLanguages(function(languages) {
      this.postMessage('terminal-info', [{
         acceptLanguages: languages,
         foregroundColor: this.terminal_.getForegroundColor(),
         backgroundColor: this.terminal_.getBackgroundColor(),
         cursorColor: this.terminal_.getCursorColor(),
         fontSize: this.terminal_.getFontSize(),
         fontFamily: this.terminal_.getFontFamily(),
         baseURL: lib.f.getURL('/')
          }]
        );
    }.bind(this));
};

/**
 * User clicked the close button on the frame decoration.
 */
hterm.Frame.prototype.onCloseClicked_ = function() {
  this.close();
};

/**
 * Close this frame.
 */
hterm.Frame.prototype.close = function() {
  if (!this.container_ || !this.container_.parentNode)
      return;

  this.container_.parentNode.removeChild(this.container_);
  this.onClose();
};


/**
 * Clients may override this.
 */
hterm.Frame.prototype.onClose = function() {};

/**
 * Send a message to the iframe.
 */
hterm.Frame.prototype.postMessage = function(name, argv) {
  if (!this.messageChannel_)
    throw new Error('Message channel is not set up.');

  this.messageChannel_.port1.postMessage({name: name, argv: argv});
};

/**
 * Show the UI for this frame.
 *
 * The iframe src is not loaded until this method is called.
 */
hterm.Frame.prototype.show = function() {
  var self = this;

  function opt(name, defaultValue) {
    if (name in self.options)
      return self.options[name];

    return defaultValue;
  }

  var self = this;

  if (this.container_ && this.container_.parentNode) {
    console.error('Frame already visible');
    return;
  }

  var headerHeight = '16px';

  var divSize = hterm.getClientSize(this.div_);

  var width = opt('width', 640);
  var height = opt('height', 480);
  var left = (divSize.width - width) / 2;
  var top = (divSize.height - height) / 2;

  var document = this.terminal_.document_;

  var container = this.container_ = document.createElement('div');
  container.style.cssText = (
      'position: absolute;' +
      'display: -webkit-flex;' +
      '-webkit-flex-direction: column;' +
      'top: 10%;' +
      'left: 4%;' +
      'width: 90%;' +
      'height: 80%;' +
      'box-shadow: 0 0 2px ' + this.terminal_.getForegroundColor() + ';' +
      'border: 2px ' + this.terminal_.getForegroundColor() + ' solid;');

  var header = document.createElement('div');
  header.style.cssText = (
      'display: -webkit-flex;' +
      '-webkit-justify-content: flex-end;' +
      'height: ' + headerHeight + ';' +
      'background-color: ' + this.terminal_.getForegroundColor() + ';' +
      'color: ' + this.terminal_.getBackgroundColor() + ';' +
      'font-size: 16px;' +
      'font-family: ' + this.terminal_.getFontFamily());
  container.appendChild(header);

  if (false) {
    // No use for the close button.
    var button = document.createElement('div');
    button.setAttribute('role', 'button');
    button.style.cssText = (
        'margin-top: -3px;' +
        'margin-right: 3px;' +
        'cursor: pointer;');
    button.textContent = '\u2a2f';
    button.addEventListener('click', this.onCloseClicked_.bind(this));
    header.appendChild(button);
  }

  var iframe = this.iframe_ = document.createElement('iframe');
  iframe.onload = this.onLoad_.bind(this);
  iframe.style.cssText = (
      'display: -webkit-flex;' +
      '-webkit-flex: 1;' +
      'width: 100%');
  iframe.setAttribute('src', this.url);
  iframe.setAttribute('seamless', true);
  container.appendChild(iframe);

  this.div_.appendChild(container);
};
// SOURCE FILE: hterm/js/hterm_keyboard.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('hterm.Keyboard.KeyMap');

/**
 * Keyboard handler.
 *
 * Consumes onKey* events and invokes onVTKeystroke on the associated
 * hterm.Terminal object.
 *
 * See also: [XTERM] as referenced in vt.js.
 *
 * @param {hterm.Terminal} The Terminal object associated with this keyboard.
 */
hterm.Keyboard = function(terminal) {
  // The parent vt interpreter.
  this.terminal = terminal;

  // The element we're currently capturing keyboard events for.
  this.keyboardElement_ = null;

  // The event handlers we are interested in, and their bound callbacks, saved
  // so they can be uninstalled with removeEventListener, when required.
  this.handlers_ = [
      ['blur', this.onBlur_.bind(this)],
      ['keydown', this.onKeyDown_.bind(this)],
      ['keypress', this.onKeyPress_.bind(this)],
      ['keyup', this.onKeyUp_.bind(this)],
      ['textInput', this.onTextInput_.bind(this)]
  ];

  /**
   * The current key map.
   */
  this.keyMap = new hterm.Keyboard.KeyMap(this);

  /**
   * If true, Shift-Insert will fall through to the browser as a paste.
   * If false, the keystroke will be sent to the host.
   */
  this.shiftInsertPaste = true;

  /**
   * If true, home/end will control the terminal scrollbar and shift home/end
   * will send the VT keycodes.  If false then home/end sends VT codes and
   * shift home/end scrolls.
   */
  this.homeKeysScroll = false;

  /**
   * Same as above, except for page up/page down.
   */
  this.pageKeysScroll = false;

  /**
   * If true, Ctrl-Plus/Minus/Zero controls zoom.
   * If false, Ctrl-Shift-Plus/Minus/Zero controls zoom, Ctrl-Minus sends ^_,
   * Ctrl-Plus/Zero do nothing.
   */
  this.ctrlPlusMinusZeroZoom = true;

  /**
   * If true, don't send Ctrl-V to the host, but instead paste the contents of
   * the clipboard. In that case, send a ^V to the host on Ctrl-Shift-V.
   */
  this.ctrlVPaste = false;

  /**
   * Enable/disable application keypad.
   *
   * This changes the way numeric keys are sent from the keyboard.
   */
  this.applicationKeypad = false;

  /**
   * Enable/disable the application cursor mode.
   *
   * This changes the way cursor keys are sent from the keyboard.
   */
  this.applicationCursor = false;

  /**
   * If true, the backspace should send BS ('\x08', aka ^H).  Otherwise
   * the backspace key should send '\x7f'.
   */
  this.backspaceSendsBackspace = false;

  /**
   * The encoding method for data sent to the host.
   */
  this.characterEncoding = 'utf-8';

  /**
   * Set whether the meta key sends a leading escape or not.
   */
  this.metaSendsEscape = true;

  /**
   * Controls how the alt key is handled.
   *
   *  escape....... Send an ESC prefix.
   *  8-bit........ Add 128 to the unshifted character as in xterm.
   *  browser-key.. Wait for the keypress event and see what the browser says.
   *                (This won't work well on platforms where the browser
   *                 performs a default action for some alt sequences.)
   *
   * This setting only matters when alt is distinct from meta (altIsMeta is
   * false.)
   */
  this.altSendsWhat = 'escape';

  /**
   * Set whether the alt key acts as a meta key, instead of producing 8-bit
   * characters.
   *
   * True to enable, false to disable, null to autodetect based on platform.
   */
  this.altIsMeta = false;

  /**
   * If true, tries to detect DEL key events that are from alt-backspace on
   * Chrome OS vs from a true DEL key press.
   *
   * Background: At the time of writing, on Chrome OS, alt-backspace is mapped
   * to DEL. Some users may be happy with this, but others may be frustrated
   * that it's impossible to do meta-backspace. If the user enables this pref,
   * we use a trick to tell a true DEL keypress from alt-backspace: on
   * alt-backspace, we will see the alt key go down, then get a DEL keystroke
   * that indicates that alt is not pressed. See http://crbug.com/174410 .
   */
  this.altBackspaceIsMetaBackspace = false;

  /**
   * Used to keep track of the current alt-key state, which is necessary for
   * the altBackspaceIsMetaBackspace preference above.
   */
  this.altIsPressed = false;

  /**
   * If true, Chrome OS media keys will be mapped to their F-key equivalent.
   * E.g. "Back" will be mapped to F1. If false, Chrome will handle the keys.
   */
  this.mediaKeysAreFKeys = false;
};

/**
 * Special handling for keyCodes in a keyboard layout.
 */
hterm.Keyboard.KeyActions = {
  /**
   * Call preventDefault and stopPropagation for this key event and nothing
   * else.
   */
  CANCEL: new String('CANCEL'),

  /**
   * This performs the default terminal action for the key.  If used in the
   * 'normal' action and the the keystroke represents a printable key, the
   * character will be sent to the host.  If used in one of the modifier
   * actions, the terminal will perform the normal action after (possibly)
   * altering it.
   *
   *  - If the normal sequence starts with CSI, the sequence will be adjusted
   *    to include the modifier parameter as described in [XTERM] in the final
   *    table of the "PC-Style Function Keys" section.
   *
   *  - If the control key is down and the key represents a printable character,
   *    and the uppercase version of the unshifted keycap is between
   *    64 (ASCII '@') and 95 (ASCII '_'), then the uppercase version of the
   *    unshifted keycap minus 64 is sent.  This makes '^@' send '\x00' and
   *    '^_' send '\x1f'.  (Note that one higher that 0x1f is 0x20, which is
   *    the first printable ASCII value.)
   *
   *  - If the alt key is down and the key represents a printable character then
   *    the value of the character is shifted up by 128.
   *
   *  - If meta is down and configured to send an escape, '\x1b' will be sent
   *    before the normal action is performed.
   */
  DEFAULT: new String('DEFAULT'),

  /**
   * Causes the terminal to opt out of handling the key event, instead letting
   * the browser deal with it.
   */
  PASS: new String('PASS'),

  /**
   * Insert the first or second character of the keyCap, based on e.shiftKey.
   * The key will be handled in onKeyDown, and e.preventDefault() will be
   * called.
   *
   * It is useful for a modified key action, where it essentially strips the
   * modifier while preventing the browser from reacting to the key.
   */
  STRIP: new String('STRIP')
};

/**
 * Encode a string according to the 'send-encoding' preference.
 */
hterm.Keyboard.prototype.encode = function(str) {
  if (this.characterEncoding == 'utf-8')
    return this.terminal.vt.encodeUTF8(str);

  return str;
};

/**
 * Capture keyboard events sent to the associated element.
 *
 * This enables the keyboard.  Captured events are consumed by this class
 * and will not perform their default action or bubble to other elements.
 *
 * Passing a null element will uninstall the keyboard handlers.
 *
 * @param {HTMLElement} element The element whose events should be captured, or
 *     null to disable the keyboard.
 */
hterm.Keyboard.prototype.installKeyboard = function(element) {
  if (element == this.keyboardElement_)
    return;

  if (element && this.keyboardElement_)
    this.installKeyboard(null);

  for (var i = 0; i < this.handlers_.length; i++) {
    var handler = this.handlers_[i];
    if (element) {
      element.addEventListener(handler[0], handler[1]);
    } else {
      this.keyboardElement_.removeEventListener(handler[0], handler[1]);
    }
  }

  this.keyboardElement_ = element;
};

/**
 * Disable keyboard event capture.
 *
 * This will allow the browser to process key events normally.
 */
hterm.Keyboard.prototype.uninstallKeyboard = function() {
  this.installKeyboard(null);
};

/**
 * Handle onTextInput events.
 *
 * We're not actually supposed to get these, but we do on the Mac in the case
 * where a third party app sends synthetic keystrokes to Chrome.
 */
hterm.Keyboard.prototype.onTextInput_ = function(e) {
  if (!e.data)
    return;

  e.data.split('').forEach(this.terminal.onVTKeystroke.bind(this.terminal));
};

/**
 * Handle onKeyPress events.
 */
hterm.Keyboard.prototype.onKeyPress_ = function(e) {
  var code;

  if (e.altKey && this.altSendsWhat == 'browser-key' && e.charCode == 0) {
    // If we got here because we were expecting the browser to handle an
    // alt sequence but it didn't do it, then we might be on an OS without
    // an enabled IME system.  In that case we fall back to xterm-like
    // behavior.
    //
    // This happens here only as a fallback.  Typically these platforms should
    // set altSendsWhat to either 'escape' or '8-bit'.
    var ch = String.fromCharCode(e.keyCode);
    if (!e.shiftKey)
      ch = ch.toLowerCase();
    code = ch.charCodeAt(0) + 128;

  } else if (e.charCode >= 32) {
    ch = e.charCode;
  }

  if (ch)
    this.terminal.onVTKeystroke(String.fromCharCode(ch));

  e.preventDefault();
  e.stopPropagation();
};

hterm.Keyboard.prototype.onBlur_ = function(e) {
  this.altIsPressed = false;
};

hterm.Keyboard.prototype.onKeyUp_ = function(e) {
  if (e.keyCode == 18)
    this.altIsPressed = false;
};

/**
 * Handle onKeyDown events.
 */
hterm.Keyboard.prototype.onKeyDown_ = function(e) {
  if (e.keyCode == 18)
    this.altIsPressed = true;

  var keyDef = this.keyMap.keyDefs[e.keyCode];
  if (!keyDef) {
    console.warn('No definition for keyCode: ' + e.keyCode);
    return;
  }

  // The type of action we're going to use.
  var resolvedActionType = null;

  var self = this;
  function getAction(name) {
    // Get the key action for the given action name.  If the action is a
    // function, dispatch it.  If the action defers to the normal action,
    // resolve that instead.

    resolvedActionType = name;

    var action = keyDef[name];
    if (typeof action == 'function')
      action = action.apply(self.keyMap, [e, keyDef]);

    if (action === DEFAULT && name != 'normal')
      action = getAction('normal');

    return action;
  }

  // Note that we use the triple-equals ('===') operator to test equality for
  // these constants, in order to distingush usage of the constant from usage
  // of a literal string that happens to contain the same bytes.
  var CANCEL = hterm.Keyboard.KeyActions.CANCEL;
  var DEFAULT = hterm.Keyboard.KeyActions.DEFAULT;
  var PASS = hterm.Keyboard.KeyActions.PASS;
  var STRIP = hterm.Keyboard.KeyActions.STRIP;

  var control = e.ctrlKey;
  var alt = this.altIsMeta ? false : e.altKey;
  var meta = this.altIsMeta ? (e.altKey || e.metaKey) : e.metaKey;

  var action;

  if (control) {
    action = getAction('control');
  } else if (alt) {
    action = getAction('alt');
  } else if (meta) {
    action = getAction('meta');
  } else {
    action = getAction('normal');
  }

  // The action may have cleared the e.shiftKey, so we wait until after
  // getAction to read it.
  var shift = e.shiftKey;

  if (alt && this.altSendsWhat == 'browser-key' && action == DEFAULT) {
    // When altSendsWhat is 'browser-key', we wait for the keypress event.
    // In keypress, the browser should have set the event.charCode to the
    // appropriate character.
    // TODO(rginda): Character compositions will need some black magic.
    action = PASS;
  }

  if (action === PASS || (action === DEFAULT && !(control || alt || meta))) {
    // If this key is supposed to be handled by the browser, or it is an
    // unmodified key with the default action, then exit this event handler.
    // If it's an unmodified key, it'll be handled in onKeyPress where we
    // can tell for sure which ASCII code to insert.
    //
    // This block needs to come before the STRIP test, otherwise we'll strip
    // the modifier and think it's ok to let the browser handle the keypress.
    // The browser won't know we're trying to ignore the modifiers and might
    // perform some default action.
    return;
  }

  if (action === STRIP) {
    alt = control = false;
    action = keyDef.normal;
    if (typeof action == 'function')
      action = action.apply(this.keyMap, [e, keyDef]);

    if (action == DEFAULT && keyDef.keyCap.length == 2)
      action = keyDef.keyCap.substr((e.shiftKey ? 1 : 0), 1);
  }

  e.preventDefault();
  e.stopPropagation();

  if (action === CANCEL)
    return;

  if (action !== DEFAULT && typeof action != 'string') {
    console.warn('Invalid action: ' + JSON.stringify(action));
    return;
  }

  // Strip the modifier that is associated with the action, since we assume that
  // modifier has already been accounted for in the action.
  if (resolvedActionType == 'control') {
    control = false;
  } else if (resolvedActionType == 'alt') {
    alt = false;
  } else if (resolvedActionType == 'meta') {
    meta = false;
  }

  if (action.substr(0, 2) == '\x1b[' && (alt || control || shift)) {
    // The action is an escape sequence that and it was triggered in the
    // presence of a keyboard modifier, we may need to alter the action to
    // include the modifier before sending it.

    var mod;

    if (shift && !(alt || control)) {
      mod = ';2';
    } else if (alt && !(shift || control)) {
      mod = ';3';
    } else if (shift && alt && !control) {
      mod = ';4';
    } else if (control && !(shift || alt)) {
      mod = ';5';
    } else if (shift && control && !alt) {
      mod = ';6';
    } else if (alt && control && !shift) {
      mod = ';7';
    } else if (shift && alt && control) {
      mod = ';8';
    }

    if (action.length == 3) {
      // Some of the CSI sequences have zero parameters unless modified.
      action = '\x1b[1' + mod + action.substr(2, 1);
    } else {
      // Others always have at least one parameter.
      action = action.substr(0, action.length - 1) + mod +
          action.substr(action.length - 1);
    }

  } else {
    if (action === DEFAULT) {
      action = keyDef.keyCap.substr((e.shiftKey ? 1 : 0), 1);

      if (control) {
        var unshifted = keyDef.keyCap.substr(0, 1);
        var code = unshifted.charCodeAt(0);
        if (code >= 64 && code <= 95) {
          action = String.fromCharCode(code - 64);
        }
      }
    }

    if (alt && this.altSendsWhat == '8-bit' && action.length == 1) {
      var code = action.charCodeAt(0) + 128;
      action = String.fromCharCode(code);
    }

    // We respect alt/metaSendsEscape even if the keymap action was a literal
    // string.  Otherwise, every overridden alt/meta action would have to
    // check alt/metaSendsEscape.
    if ((alt && this.altSendsWhat == 'escape') ||
        (meta && this.metaSendsEscape)) {
      action = '\x1b' + action;
    }
  }

  this.terminal.onVTKeystroke(action);
};
// SOURCE FILE: hterm/js/hterm_keyboard_keymap.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('hterm.Keyboard.KeyActions');

/**
 * The default key map for hterm.
 *
 * Contains a mapping of keyCodes to keyDefs (aka key definitions).  The key
 * definition tells the hterm.Keyboard class how to handle keycodes.
 *
 * This should work for most cases, as the printable characters get handled
 * in the keypress event.  In that case, even if the keycap is wrong in the
 * key map, the correct character should be sent.
 *
 * Different layouts, such as Dvorak should work with this keymap, as those
 * layouts typically move keycodes around on the keyboard without disturbing
 * the actual keycaps.
 *
 * There may be issues with control keys on non-US keyboards or with keyboards
 * that very significantly from the expectations here, in which case we may
 * have to invent new key maps.
 *
 * The sequences defined in this key map come from [XTERM] as referenced in
 * vt.js, starting with the section titled "Alt and Meta Keys".
 */
hterm.Keyboard.KeyMap = function(keyboard) {
  this.keyboard = keyboard;
  this.keyDefs = {};
  this.reset();
};

/**
 * Add a single key definition.
 *
 * The definition is a hash containing the following keys: 'keyCap', 'normal',
 * 'control', and 'alt'.
 *
 *  - keyCap is a string identifying the key.  For printable
 *    keys, the key cap should be exactly two characters, starting with the
 *    unshifted version.  For example, 'aA', 'bB', '1!' and '=+'.  For
 *    non-printable the key cap should be surrounded in square braces, as in
 *    '[INS]', '[LEFT]'.  By convention, non-printable keycaps are in uppercase
 *    but this is not a strict requirement.
 *
 *  - Normal is the action that should be performed when they key is pressed
 *    in the absence of any modifier.  See below for the supported actions.
 *
 *  - Control is the action that should be performed when they key is pressed
 *    along with the control modifier.  See below for the supported actions.
 *
 *  - Alt is the action that should be performed when they key is pressed
 *    along with the alt modifier.  See below for the supported actions.
 *
 *  - Meta is the action that should be performed when they key is pressed
 *    along with the meta modifier.  See below for the supported actions.
 *
 * Actions can be one of the hterm.Keyboard.KeyActions as documented below,
 * a literal string, or an array.  If the action is a literal string then
 * the string is sent directly to the host.  If the action is an array it
 * is taken to be an escape sequence that may be altered by modifier keys.
 * The second-to-last element of the array will be overwritten with the
 * state of the modifier keys, as specified in the final table of "PC-Style
 * Function Keys" from [XTERM].
 */
hterm.Keyboard.KeyMap.prototype.addKeyDef = function(keyCode, def) {
  if (keyCode in this.keyDefs)
    console.warn('Duplicate keyCode: ' + keyCode);

  this.keyDefs[keyCode] = def;
};

/**
 * Add mutiple key definitions in a single call.
 *
 * This function takes the key definitions as variable argument list.  Each
 * argument is the key definition specified as an array.
 *
 * (If the function took everything as one big hash we couldn't detect
 * duplicates, and there would be a lot more typing involved.)
 *
 * Each key definition should have 6 elements: (keyCode, keyCap, normal action,
 * control action, alt action and meta action).  See KeyMap.addKeyDef for the
 * meaning of these elements.
 */
hterm.Keyboard.KeyMap.prototype.addKeyDefs = function(var_args) {
  for (var i = 0; i < arguments.length; i++) {
    this.addKeyDef(arguments[i][0],
                   { keyCap: arguments[i][1],
                     normal: arguments[i][2],
                     control: arguments[i][3],
                     alt: arguments[i][4],
                     meta: arguments[i][5]
                   });
  }
};

/**
 * Inherit from hterm.Keyboard.KeyMap, as defined in keyboard.js.
 */
hterm.Keyboard.KeyMap.prototype = {
  __proto__: hterm.Keyboard.KeyMap.prototype
};

/**
 * Set up the default state for this keymap.
 */
hterm.Keyboard.KeyMap.prototype.reset = function() {
  this.keyDefs = {};

  var self = this;

  // This function us used by the "macro" functions below.  It makes it
  // possible to use the call() macro as an argument to any other macro.
  function resolve(action, e, k) {
    if (typeof action == 'function')
      return action.apply(self, [e, k]);

    return action;
  }

  // If not application keypad a, else b.  The keys that care about
  // application keypad ignore it when the key is modified.
  function ak(a, b) {
    return function(e, k) {
      var action = (e.shiftKey || e.ctrlKey || e.altKey || e.metaKey ||
                    !self.keyboard.applicationKeypad) ? a : b;
      return resolve(action, e, k);
    }
  }

  // If mod or not application cursor a, else b.  The keys that care about
  // application cursor ignore it when the key is modified.
  function ac(a, b) {
    return function(e, k) {
      var action = (e.shiftKey || e.ctrlKey || e.altKey || e.metaKey ||
                    !self.keyboard.applicationCursor) ? a : b;
      return resolve(action, e, k);
    }
  }

  // If not backspace-sends-backspace keypad a, else b.
  function bs(a, b) {
    return function(e, k) {
      var action = !self.keyboard.backspaceSendsBackspace ? a : b
      return resolve(action, e, k);
    }
  }

  // If not e.shiftKey a, else b.
  function sh(a, b) {
    return function(e, k) {
      var action = !e.shiftKey ? a : b

      // Clear e.shiftKey so that the keyboard code doesn't try to apply
      // additional modifiers to the sequence.
      delete e.shiftKey;
      e.shiftKey = false;

      return resolve(action, e, k);
    }
  }

  // If no modifiers a, else b.
  function mod(a, b) {
    return function (e, k) {
      var action = !(e.shiftKey || e.ctrlKey || e.altKey || e.metaKey) ? a : b;
      return resolve(action, e, k);
    }
  }

  // Compute a control character for a given character.
  function ctl(ch) { return String.fromCharCode(ch.charCodeAt(0) - 64) }

  // Call a method on the keymap instance.
  function c(m) { return function (e, k) { return this[m](e, k) } }

  // Ignore if not trapping media keys
  function med(fn) {
    return function(e, k) {
      if (!self.keyboard.mediaKeysAreFKeys) {
        return hterm.Keyboard.KeyActions.PASS;
      }
      return resolve(fn, e, k);
    };
  }

  var ESC = '\x1b';
  var CSI = '\x1b[';
  var SS3 = '\x1bO';

  var CANCEL = hterm.Keyboard.KeyActions.CANCEL;
  var DEFAULT = hterm.Keyboard.KeyActions.DEFAULT;
  var PASS = hterm.Keyboard.KeyActions.PASS;
  var STRIP = hterm.Keyboard.KeyActions.STRIP;

  this.addKeyDefs(
    // These fields are: [keycode, keycap, normal, control, alt, meta]

    // The browser sends the keycode 0 for some keys.  We'll just assume it's
    // going to do the right thing by default for those keys.
    [0,   '[UNKNOWN]', PASS, PASS, PASS, PASS],

    // First row.
    [27,  '[ESC]', ESC,                       DEFAULT, DEFAULT,     DEFAULT],
    [112, '[F1]',  mod(SS3 + 'P', CSI + 'P'), DEFAULT, CSI + "23~", DEFAULT],
    [113, '[F2]',  mod(SS3 + 'Q', CSI + 'Q'), DEFAULT, CSI + "24~", DEFAULT],
    [114, '[F3]',  mod(SS3 + 'R', CSI + 'R'), DEFAULT, CSI + "25~", DEFAULT],
    [115, '[F4]',  mod(SS3 + 'S', CSI + 'S'), DEFAULT, CSI + "26~", DEFAULT],
    [116, '[F5]',  CSI + '15~',               DEFAULT, CSI + "28~", DEFAULT],
    [117, '[F6]',  CSI + '17~',               DEFAULT, CSI + "29~", DEFAULT],
    [118, '[F7]',  CSI + '18~',               DEFAULT, CSI + "31~", DEFAULT],
    [119, '[F8]',  CSI + '19~',               DEFAULT, CSI + "32~", DEFAULT],
    [120, '[F9]',  CSI + '20~',               DEFAULT, CSI + "33~", DEFAULT],
    [121, '[F10]', CSI + '21~',               DEFAULT, CSI + "34~", DEFAULT],
    [122, '[F11]', CSI + '23~',               DEFAULT, CSI + "42~", DEFAULT],
    [123, '[F12]', CSI + '24~',               DEFAULT, CSI + "43~", DEFAULT],

    // Second row.
    [192, '`~', DEFAULT, sh(ctl('@'), ctl('^')),     DEFAULT,           PASS],
    [49,  '1!', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [50,  '2@', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [51,  '3#', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [52,  '4$', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [53,  '5%', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [54,  '6^', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [55,  '7&', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [56,  '8*', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [57,  '9(', DEFAULT, c('onCtrlNum_'),    c('onAltNum_'), c('onMetaNum_')],
    [48,  '0)', DEFAULT, c('onPlusMinusZero_'),c('onAltNum_'),c('onMetaNum_')],
    [189, '-_', DEFAULT, c('onPlusMinusZero_'),         DEFAULT,     DEFAULT],
    [187, '=+', DEFAULT, c('onPlusMinusZero_'),         DEFAULT,     DEFAULT],
    [8,   '[BKSP]', bs('\x7f', '\b'), bs('\b', '\x7f'), DEFAULT,     DEFAULT],

    // Third row.
    [9,   '[TAB]', sh('\t', CSI + 'Z'), STRIP,     PASS,    DEFAULT],
    [81,  'qQ',    DEFAULT,             ctl('Q'),  DEFAULT, DEFAULT],
    [87,  'wW',    DEFAULT,             ctl('W'),  DEFAULT, DEFAULT],
    [69,  'eE',    DEFAULT,             ctl('E'),  DEFAULT, DEFAULT],
    [82,  'rR',    DEFAULT,             ctl('R'),  DEFAULT, DEFAULT],
    [84,  'tT',    DEFAULT,             ctl('T'),  DEFAULT, DEFAULT],
    [89,  'yY',    DEFAULT,             ctl('Y'),  DEFAULT, DEFAULT],
    [85,  'uU',    DEFAULT,             ctl('U'),  DEFAULT, DEFAULT],
    [73,  'iI',    DEFAULT,             ctl('I'),  DEFAULT, DEFAULT],
    [79,  'oO',    DEFAULT,             ctl('O'),  DEFAULT, DEFAULT],
    [80,  'pP',    DEFAULT,             ctl('P'),  DEFAULT, DEFAULT],
    [219, '[{',    DEFAULT,             ctl('['),  DEFAULT, DEFAULT],
    [221, ']}',    DEFAULT,             ctl(']'),  DEFAULT, DEFAULT],
    [220, '\\|',   DEFAULT,             ctl('\\'), DEFAULT, DEFAULT],

    // Fourth row. (We let Ctrl-Shift-J pass for Chrome DevTools.)
    [20,  '[CAPS]',  PASS,    PASS,                           PASS,    DEFAULT],
    [65,  'aA',      DEFAULT, ctl('A'),                       DEFAULT, DEFAULT],
    [83,  'sS',      DEFAULT, ctl('S'),                       DEFAULT, DEFAULT],
    [68,  'dD',      DEFAULT, ctl('D'),                       DEFAULT, DEFAULT],
    [70,  'fF',      DEFAULT, ctl('F'),                       DEFAULT, DEFAULT],
    [71,  'gG',      DEFAULT, ctl('G'),                       DEFAULT, DEFAULT],
    [72,  'hH',      DEFAULT, ctl('H'),                       DEFAULT, DEFAULT],
    [74,  'jJ',      DEFAULT, sh(ctl('J'), PASS),             DEFAULT, DEFAULT],
    [75,  'kK',      DEFAULT, sh(ctl('K'), c('onClear_')),    DEFAULT, DEFAULT],
    [76,  'lL',      DEFAULT, sh(ctl('L'), PASS),             DEFAULT, DEFAULT],
    [186, ';:',      DEFAULT, STRIP,                          DEFAULT, DEFAULT],
    [222, '\'"',     DEFAULT, STRIP,                          DEFAULT, DEFAULT],
    [13,  '[ENTER]', '\r',    CANCEL,                         CANCEL,  DEFAULT],

    // Fifth row.  This includes the copy/paste shortcuts.  On some
    // platforms it's Ctrl-C/V, on others it's Meta-C/V.  We assume either
    // Ctrl-C/Meta-C should pass to the browser when there is a selection,
    // and Ctrl-Shift-V/Meta-*-V should always pass to the browser (since
    // these seem to be recognized as paste too).
    [16,  '[SHIFT]', PASS, PASS,                   PASS,    DEFAULT],
    [90,  'zZ',   DEFAULT, ctl('Z'),               DEFAULT, DEFAULT],
    [88,  'xX',   DEFAULT, ctl('X'),               DEFAULT, DEFAULT],
    [67,  'cC',   DEFAULT, c('onCtrlC_'),          DEFAULT, c('onMetaC_')],
    [86,  'vV',   DEFAULT, c('onCtrlV_'),          DEFAULT, PASS],
    [66,  'bB',   DEFAULT, sh(ctl('B'), PASS),     DEFAULT, sh(DEFAULT, PASS)],
    [78,  'nN',   DEFAULT, c('onCtrlN_'),          DEFAULT, c('onMetaN_')],
    [77,  'mM',   DEFAULT, ctl('M'),               DEFAULT, DEFAULT],
    [188, ',<',   DEFAULT, STRIP,                  DEFAULT, DEFAULT],
    [190, '.>',   DEFAULT, STRIP,                  DEFAULT, DEFAULT],
    [191, '/?',   DEFAULT, sh(ctl('_'), ctl('?')), DEFAULT, DEFAULT],

    // Sixth and final row.
    [17,  '[CTRL]', PASS,    PASS,     PASS,    PASS],
    [18,  '[ALT]',  PASS,    PASS,     PASS,    PASS],
    [91,  '[LAPL]', PASS,    PASS,     PASS,    PASS],
    [32,  ' ',      DEFAULT, ctl('@'), DEFAULT, DEFAULT],
    [92,  '[RAPL]', PASS,    PASS,     PASS,    PASS],

    // These things.
    [42,  '[PRTSCR]', PASS, PASS, PASS, PASS],
    [145, '[SCRLK]',  PASS, PASS, PASS, PASS],
    [19,  '[BREAK]',  PASS, PASS, PASS, PASS],

    // The block of six keys above the arrows.
    [45,  '[INSERT]', c('onKeyInsert_'),   DEFAULT, DEFAULT, DEFAULT],
    [36,  '[HOME]',   c('onKeyHome_'),     DEFAULT, DEFAULT, DEFAULT],
    [33,  '[PGUP]',   c('onKeyPageUp_'),   DEFAULT, DEFAULT, DEFAULT],
    [46,  '[DEL]',    c('onKeyDel_'),      DEFAULT, DEFAULT, DEFAULT],
    [35,  '[END]',    c('onKeyEnd_'),      DEFAULT, DEFAULT, DEFAULT],
    [34,  '[PGDOWN]', c('onKeyPageDown_'), DEFAULT, DEFAULT, DEFAULT],

    // Arrow keys.  When unmodified they respect the application cursor state,
    // otherwise they always send the CSI codes.
    [38, '[UP]',    ac(CSI + 'A', SS3 + 'A'), DEFAULT, DEFAULT, DEFAULT],
    [40, '[DOWN]',  ac(CSI + 'B', SS3 + 'B'), DEFAULT, DEFAULT, DEFAULT],
    [39, '[RIGHT]', ac(CSI + 'C', SS3 + 'C'), DEFAULT, DEFAULT, DEFAULT],
    [37, '[LEFT]',  ac(CSI + 'D', SS3 + 'D'), DEFAULT, DEFAULT, DEFAULT],

    [144, '[NUMLOCK]', PASS, PASS, PASS, PASS],

    // With numlock off, the keypad generates the same key codes as the arrows
    // and 'block of six' for some keys, and null key codes for the rest.

    // Keypad with numlock on generates unique key codes...
    [96,  '[KP0]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [97,  '[KP1]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [98,  '[KP2]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [99,  '[KP3]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [100, '[KP4]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [101, '[KP5]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [102, '[KP6]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [103, '[KP7]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [104, '[KP8]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [105, '[KP9]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [107, '[KP+]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [109, '[KP-]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [106, '[KP*]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [111, '[KP/]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],
    [110, '[KP.]', DEFAULT, DEFAULT, DEFAULT, DEFAULT],

    // Chrome OS keyboard top row.
    [166, '[BACK]',   med(mod(SS3+'P', CSI+'P')), DEFAULT, CSI+"23~", DEFAULT],
    [167, '[FWD]',    med(mod(SS3+'Q', CSI+'Q')), DEFAULT, CSI+"24~", DEFAULT],
    [168, '[RELOAD]', med(mod(SS3+'R', CSI+'R')), DEFAULT, CSI+"25~", DEFAULT],
    [183, '[FSCR]',   med(mod(SS3+'S', CSI+'S')), DEFAULT, CSI+"26~", DEFAULT],
    [182, '[WINS]',   med(CSI + '15~'),           DEFAULT, CSI+"28~", DEFAULT],
    [216, '[BRIT-]',  med(CSI + '17~'),           DEFAULT, CSI+"29~", DEFAULT],
    [217, '[BRIT+]',  med(CSI + '18~'),           DEFAULT, CSI+"31~", DEFAULT],
    [173, '[MUTE]',   med(CSI + '19~'),           DEFAULT, CSI+"32~", DEFAULT],
    [174, '[VOL-]',   med(CSI + '20~'),           DEFAULT, CSI+"33~", DEFAULT],
    [175, '[VOL+]',   med(CSI + '21~'),           DEFAULT, CSI+"34~", DEFAULT]
  );
};

/**
 * Either allow the paste or send a key sequence.
 */
hterm.Keyboard.KeyMap.prototype.onKeyInsert_ = function(e) {
  if (this.keyboard.shiftInsertPaste && e.shiftKey)
    return hterm.Keyboard.KeyActions.PASS;

  return '\x1b[2~';
};

/**
 * Either scroll the scrollback buffer or send a key sequence.
 */
hterm.Keyboard.KeyMap.prototype.onKeyHome_ = function(e) {
  if (!this.keyboard.homeKeysScroll ^ e.shiftKey) {
    if ((e.altey || e.ctrlKey || e.shiftKey) ||
        !this.keyboard.applicationKeypad) {
      return '\x1b[H';
    }

    return '\x1bOH';
  }

  this.keyboard.terminal.scrollHome();
  return hterm.Keyboard.KeyActions.CANCEL;
};

/**
 * Either scroll the scrollback buffer or send a key sequence.
 */
hterm.Keyboard.KeyMap.prototype.onKeyEnd_ = function(e) {
  if (!this.keyboard.homeKeysScroll ^ e.shiftKey) {
    if ((e.altKey || e.ctrlKey || e.shiftKey) ||
        !this.keyboard.applicationKeypad) {
      return '\x1b[F';
    }

    return '\x1bOF';
  }

  this.keyboard.terminal.scrollEnd();
  return hterm.Keyboard.KeyActions.CANCEL;
};

/**
 * Either scroll the scrollback buffer or send a key sequence.
 */
hterm.Keyboard.KeyMap.prototype.onKeyPageUp_ = function(e) {
  if (!this.keyboard.pageKeysScroll ^ e.shiftKey)
    return '\x1b[5~';

  this.keyboard.terminal.scrollPageUp();
  return hterm.Keyboard.KeyActions.CANCEL;
};

/**
 * Either send a true DEL, or sub in meta-backspace.
 *
 * On Chrome OS, if we know the alt key is down, but we get a DEL event that
 * claims that the alt key is not pressed, we know the DEL was a synthetic
 * one from a user that hit alt-backspace. Based on a user pref, we can sub
 * in meta-backspace in this case.
 */
hterm.Keyboard.KeyMap.prototype.onKeyDel_ = function(e) {
  if (this.keyboard.altBackspaceIsMetaBackspace &&
      this.keyboard.altIsPressed && !e.altKey)
    return '\x1b\x7f';
  return '\x1b[3~';
};

/**
 * Either scroll the scrollback buffer or send a key sequence.
 */
hterm.Keyboard.KeyMap.prototype.onKeyPageDown_ = function(e) {
  if (!this.keyboard.pageKeysScroll ^ e.shiftKey)
    return '\x1b[6~';

  this.keyboard.terminal.scrollPageDown();
  return hterm.Keyboard.KeyActions.CANCEL;
};

/**
 * Clear the primary/alternate screens and the scrollback buffer.
 */
hterm.Keyboard.KeyMap.prototype.onClear_ = function(e, keyDef) {
  this.keyboard.terminal.wipeContents();
  return hterm.Keyboard.KeyActions.CANCEL;
};

/**
 * Either pass Ctrl-1..9 to the browser or send them to the host.
 *
 * Note that Ctrl-1 and Ctrl-9 don't actually have special sequences mapped
 * to them in xterm or gnome-terminal.  The range is really Ctrl-2..8, but
 * we handle 1..9 since Chrome treats the whole range special.
 */
hterm.Keyboard.KeyMap.prototype.onCtrlNum_ = function(e, keyDef) {
  // Compute a control character for a given character.
  function ctl(ch) { return String.fromCharCode(ch.charCodeAt(0) - 64) }

  if (this.keyboard.terminal.passCtrlNumber && !e.shiftKey)
    return hterm.Keyboard.KeyActions.PASS;

  switch (keyDef.keyCap.substr(0, 1)) {
    case '1': return '1';
    case '2': return ctl('@');
    case '3': return ctl('[');
    case '4': return ctl('\\');
    case '5': return ctl(']');
    case '6': return ctl('^');
    case '7': return ctl('_');
    case '8': return '\x7f';
    case '9': return '9';
  }
};

/**
 * Either pass Alt-1..9 to the browser or send them to the host.
 */
hterm.Keyboard.KeyMap.prototype.onAltNum_ = function(e, keyDef) {
  if (this.keyboard.terminal.passAltNumber && !e.shiftKey)
    return hterm.Keyboard.KeyActions.PASS;

  return hterm.Keyboard.KeyActions.DEFAULT;
};

/**
 * Either pass Meta-1..9 to the browser or send them to the host.
 */
hterm.Keyboard.KeyMap.prototype.onMetaNum_ = function(e, keyDef) {
  if (this.keyboard.terminal.passMetaNumber && !e.shiftKey)
    return hterm.Keyboard.KeyActions.PASS;

  return hterm.Keyboard.KeyActions.DEFAULT;
};

/**
 * Either send a ^C or allow the browser to interpret the keystroke as a copy
 * command.
 *
 * If there is no selection, or if the user presses Ctrl-Shift-C, then we'll
 * transmit a ^C ('\x03').  If there is a selection, we defer to the
 * browser.  In this case we clear out the selection so the user knows we
 * heard them, and also to give them a chance to send a ^C by just hitting
 * the key again.
 */
hterm.Keyboard.KeyMap.prototype.onCtrlC_ = function(e, keyDef) {
  var selection = this.keyboard.terminal.getDocument().getSelection();
  if (e.shiftKey || selection.isCollapsed) {
    // If the shift key is being held or there is no document selection, then
    // send a ^C.
    return '\x03';
  }

  // Otherwise let the browser handle it as a copy command.  Clear the selection
  // soon after a Ctrl-C copy, so that it frees up Ctrl-C to send ^C.
  setTimeout(selection.collapseToEnd.bind(selection), 750);
  return hterm.Keyboard.KeyActions.PASS;
};

/**
 * Either send a ^N or open a new window to the same location.
 */
hterm.Keyboard.KeyMap.prototype.onCtrlN_ = function(e, keyDef) {
  if (e.shiftKey) {
    window.open(document.location.href, '',
                'chrome=no,close=yes,resize=yes,scrollbars=yes,' +
                'minimizable=yes,width=' + window.innerWidth +
                ',height=' + window.innerHeight);
    return hterm.Keyboard.KeyActions.CANCEL;
  }

  return '\x0e';
};

/**
 * Either send a ^V or allow the browser to interpret the keystroke as a paste
 * command.
 *
 * The default behavior is to paste if the user presses Ctrl-Shift-V, and send
 * a ^V if the user presses Ctrl-V. This can be flipped with the
 * 'ctrl-v-paste' preference.
 */
hterm.Keyboard.KeyMap.prototype.onCtrlV_ = function(e, keyDef) {
  if ((!e.shiftKey && this.keyboard.ctrlVPaste) ||
      (e.shiftKey && !this.keyboard.ctrlVPaste)) {
    return hterm.Keyboard.KeyActions.PASS;
  }
  return '\x16';
};

/**
 * Either the default action or open a new window to the same location.
 */
hterm.Keyboard.KeyMap.prototype.onMetaN_ = function(e, keyDef) {
  if (e.shiftKey) {
    window.open(document.location.href, '',
                'chrome=no,close=yes,resize=yes,scrollbars=yes,' +
                'minimizable=yes,width=' + window.outerWidth +
                ',height=' + window.outerHeight);
    return hterm.Keyboard.KeyActions.CANCEL;
  }

  return hterm.Keyboard.KeyActions.DEFAULT;
};

/**
 * Either send a Meta-C or allow the browser to interpret the keystroke as a
 * copy command.
 *
 * If there is no selection, or if the user presses Meta-Shift-C, then we'll
 * transmit an '\x1b' (if metaSendsEscape is on) followed by 'c' or 'C'.
 *
 * If there is a selection, we defer to the browser.  In this case we clear out
 * the selection so the user knows we heard them, and also to give them a
 * chance to send a Meta-C by just hitting the key again.
 */
hterm.Keyboard.KeyMap.prototype.onMetaC_ = function(e, keyDef) {
  var document = this.keyboard.terminal.getDocument();
  if (e.shiftKey || document.getSelection().isCollapsed) {
    // If the shift key is being held, or there is no document selection, send
    // a Meta-C.  The keyboard code will add the ESC if metaSendsEscape is true,
    // we just have to decide between 'c' and 'C'.
    return keyDef.keyCap.substr(e.shiftKey ? 1 : 0, 1);
  }

  // Otherwise let the browser handle it as a copy command.
  setTimeout(function() { document.getSelection().collapseToEnd() }, 50);
  return hterm.Keyboard.KeyActions.PASS;
};

/**
 * Handle font zooming.
 *
 * The browser's built-in zoom has a bit of an issue at certain zoom levels.
 * At some magnifications, the measured height of a row of text differs from
 * the height that was explicitly set.
 *
 * We override the browser zoom keys to change the ScrollPort's font size to
 * avoid the issue.
 */
hterm.Keyboard.KeyMap.prototype.onPlusMinusZero_ = function(e, keyDef) {
  if (!(this.keyboard.ctrlPlusMinusZeroZoom ^ e.shiftKey)) {
    // If ctrl-PMZ controls zoom and the shift key is pressed, or
    // ctrl-shift-PMZ controls zoom and this shift key is not pressed,
    // then we want to send the control code instead of affecting zoom.
    if (keyDef.keyCap == '-_')
      return '\x1f';  // ^_

    // Only ^_ is valid, the other sequences have no meaning.
    return hterm.Keyboard.KeyActions.CANCEL;
  }

  if (this.keyboard.terminal.getZoomFactor() != 1) {
    // If we're not at 1:1 zoom factor, let the Ctrl +/-/0 keys control the
    // browser zoom, so it's easier to for the user to get back to 100%.
    return hterm.Keyboard.KeyActions.PASS;
  }

  var cap = keyDef.keyCap.substr(0, 1);
  if (cap == '0') {
      this.keyboard.terminal.setFontSize(0);
  } else {
    var size = this.keyboard.terminal.getFontSize();

    if (cap == '-') {
      size -= 1;
    } else {
      size += 1;
    }

    this.keyboard.terminal.setFontSize(size);
  }

  return hterm.Keyboard.KeyActions.CANCEL;
};
// SOURCE FILE: hterm/js/hterm_options.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

/**
 * @fileoverview This file implements the hterm.Options class,
 * which stores current operating conditions for the terminal.  This object is
 * used instead of a series of parameters to allow saving/restoring of cursor
 * conditions easily, and to provide an easy place for common configuration
 * options.
 *
 * Original code by Cory Maccarrone.
 */

/**
 * Constructor for the hterm.Options class, optionally acting as a copy
 * constructor.
 *
 * The defaults are as defined in http://www.vt100.net/docs/vt510-rm/DECSTR
 * except that we enable autowrap (wraparound) by defaut since that seems to
 * be what xterm does.
 *
 * @param {hterm.Options=} opt_copy Optional instance to copy.
 * @constructor
 */
hterm.Options = function(opt_copy) {
  // All attributes in this class are public to allow easy access by the
  // terminal.

  this.wraparound = opt_copy ? opt_copy.wraparound : true;
  this.reverseWraparound = opt_copy ? opt_copy.reverseWraparound : false;
  this.originMode = opt_copy ? opt_copy.originMode : false;
  this.autoCarriageReturn = opt_copy ? opt_copy.autoCarriageReturn : false;
  this.cursorVisible = opt_copy ? opt_copy.cursorVisible : false;
  this.cursorBlink = opt_copy ? opt_copy.cursorBlink : false;
  this.insertMode = opt_copy ? opt_copy.insertMode : false;
  this.reverseVideo = opt_copy ? opt_copy.reverseVideo : false;
};
// SOURCE FILE: hterm/js/hterm_preference_manager.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.f', 'lib.Storage');

/**
 * PreferenceManager subclass managing global NaSSH preferences.
 *
 * This is currently just an ordered list of known connection profiles.
 */
hterm.PreferenceManager = function(profileId) {
  lib.PreferenceManager.call(this, hterm.defaultStorage,
                             '/hterm/profiles/' + profileId);
  this.definePreferences
  ([
    /**
     * If set, undoes the Chrome OS Alt-Backspace->DEL remap, so that
     * alt-backspace indeed is alt-backspace.
     */
    ['alt-backspace-is-meta-backspace', false],

    /**
     * Set whether the alt key acts as a meta key or as a distinct alt key.
     */
    ['alt-is-meta', false],

    /**
     * Controls how the alt key is handled.
     *
     *  escape....... Send an ESC prefix.
     *  8-bit........ Add 128 to the unshifted character as in xterm.
     *  browser-key.. Wait for the keypress event and see what the browser says.
     *                (This won't work well on platforms where the browser
     *                 performs a default action for some alt sequences.)
     */
    ['alt-sends-what', 'escape'],

    /**
     * Terminal bell sound.  Empty string for no audible bell.
     */
    ['audible-bell-sound', 'lib-resource:hterm/audio/bell'],

    /**
     * The background color for text with no other color attributes.
     */
    ['background-color', 'rgb(16, 16, 16)'],

    /**
     * The background image.
     */
    ['background-image', ''],

    /**
     * The background image size,
     *
     * Defaults to none.
     */
    ['background-size', ''],

    /**
     * The background image position,
     *
     * Defaults to none.
     */
    ['background-position', ''],

    /**
     * If true, the backspace should send BS ('\x08', aka ^H).  Otherwise
     * the backspace key should send '\x7f'.
     */
    ['backspace-sends-backspace', false],

    /**
     * Whether or not to close the window when the command exits.
     */
    ['close-on-exit', true],

    /**
     * Whether or not to blink the cursor by default.
     */
    ['cursor-blink', false],

    /**
     * The color of the visible cursor.
     */
    ['cursor-color', 'rgba(255,0,0,0.5)'],

    /**
     * Override colors in the default palette.
     *
     * This can be specified as an array or an object.  If specified as an
     * object it is assumed to be a sparse array, where each property
     * is a numeric index into the color palette.
     *
     * Values can be specified as css almost any css color value.  This
     * includes #RGB, #RRGGBB, rgb(...), rgba(...), and any color names
     * that are also part of the stock X11 rgb.txt file.
     *
     * You can use 'null' to specify that the default value should be not
     * be changed.  This is useful for skipping a small number of indicies
     * when the value is specified as an array.
     */
    ['color-palette-overrides', null],

    /**
     * Automatically copy mouse selection to the clipboard.
     */
    ['copy-on-select', true],

    /**
     * If true, Ctrl-Plus/Minus/Zero controls zoom.
     * If false, Ctrl-Shift-Plus/Minus/Zero controls zoom, Ctrl-Minus sends ^_,
     * Ctrl-Plus/Zero do nothing.
     */
    ['ctrl-plus-minus-zero-zoom', true],

    /**
     * Ctrl+V pastes if true, sent to host if false.
     * Ctrl+Shift+V sends a ^V to host if true, pastes if false.
     */
    ['ctrl-v-paste', false],

    /**
     * True to enable 8-bit control characters, false to ignore them.
     *
     * We'll respect the two-byte versions of these control characters
     * regardless of this setting.
     */
    ['enable-8-bit-control', false],

    /**
     * True if we should use bold weight font for text with the bold/bright
     * attribute.  False to use the normal weight font.  Null to autodetect.
     */
    ['enable-bold', null],

    /**
     * True if we should use bright colors (8-15 on a 16 color palette)
     * for any text with the bold attribute.  False otherwise.
     */
    ['enable-bold-as-bright', true],

    /**
     * Allow the host to write directly to the system clipboard.
     */
    ['enable-clipboard-notice', true],

    /**
     * Allow the host to write directly to the system clipboard.
     */
    ['enable-clipboard-write', true],

    /**
     * Respect the host's attempt to change the cursor blink status using
     * DEC Private Mode 12.
     */
    ['enable-dec12', false],

    /**
     * The default environment variables.
     */
    ['environment', {TERM: 'xterm-256color'}],

    /**
     * Default font family for the terminal text.
     */
    ['font-family', ('"DejaVu Sans Mono", "Everson Mono", ' +
                     'FreeMono, "Menlo", "Terminal", ' +
                     'monospace')],

    /**
     * The default font size in pixels.
     */
    ['font-size', 15],

    /**
     * Anti-aliasing.
     */
    ['font-smoothing', 'antialiased'],

    /**
     * The foreground color for text with no other color attributes.
     */
    ['foreground-color', 'rgb(240, 240, 240)'],

    /**
     * If true, home/end will control the terminal scrollbar and shift home/end
     * will send the VT keycodes.  If false then home/end sends VT codes and
     * shift home/end scrolls.
     */
    ['home-keys-scroll', false],

    /**
     * Max length of a DCS, OSC, PM, or APS sequence before we give up and
     * ignore the code.
     */
    ['max-string-sequence', 100000],

    /**
     * If true, convert media keys to their Fkey equivalent. If false, let
     * Chrome handle the keys.
     */
    ['media-keys-are-fkeys', false],

    /**
     * Set whether the meta key sends a leading escape or not.
     */
    ['meta-sends-escape', true],

    /**
     * Mouse paste button, or null to autodetect.
     *
     * For autodetect, we'll try to enable middle button paste for non-X11
     * platforms.
     *
     * On X11 we move it to button 3, but that'll probably be a context menu
     * in the future.
     */
    ['mouse-paste-button', null],

    /**
     * If true, page up/down will control the terminal scrollbar and shift
     * page up/down will send the VT keycodes.  If false then page up/down
     * sends VT codes and shift page up/down scrolls.
     */
    ['page-keys-scroll', false],

    /**
     * Set whether we should pass Alt-1..9 to the browser.
     *
     * This is handy when running hterm in a browser tab, so that you don't lose
     * Chrome's "switch to tab" keyboard accelerators.  When not running in a
     * tab it's better to send these keys to the host so they can be used in
     * vim or emacs.
     *
     * If true, Alt-1..9 will be handled by the browser.  If false, Alt-1..9
     * will be sent to the host.  If null, autodetect based on browser platform
     * and window type.
     */
    ['pass-alt-number', null],

    /**
     * Set whether we should pass Ctrl-1..9 to the browser.
     *
     * This is handy when running hterm in a browser tab, so that you don't lose
     * Chrome's "switch to tab" keyboard accelerators.  When not running in a
     * tab it's better to send these keys to the host so they can be used in
     * vim or emacs.
     *
     * If true, Ctrl-1..9 will be handled by the browser.  If false, Ctrl-1..9
     * will be sent to the host.  If null, autodetect based on browser platform
     * and window type.
     */
    ['pass-ctrl-number', null],

    /**
     * Set whether we should pass Meta-1..9 to the browser.
     *
     * This is handy when running hterm in a browser tab, so that you don't lose
     * Chrome's "switch to tab" keyboard accelerators.  When not running in a
     * tab it's better to send these keys to the host so they can be used in
     * vim or emacs.
     *
     * If true, Meta-1..9 will be handled by the browser.  If false, Meta-1..9
     * will be sent to the host.  If null, autodetect based on browser platform
     * and window type.
     */
    ['pass-meta-number', null],

    /**
     * Set the expected encoding for data received from the host.
     *
     * Valid values are 'utf-8' and 'raw'.
     */
    ['receive-encoding', 'utf-8'],

    /**
     * If true, scroll to the bottom on any keystroke.
     */
    ['scroll-on-keystroke', true],

    /**
     * If true, scroll to the bottom on terminal output.
     */
    ['scroll-on-output', false],

    /**
     * The vertical scrollbar mode.
     */
    ['scrollbar-visible', true],

    /**
     * Set the encoding for data sent to host.
     *
     * Valid values are 'utf-8' and 'raw'.
     */
    ['send-encoding', 'utf-8'],

    /**
     * Shift + Insert pastes if true, sent to host if false.
     */
    ['shift-insert-paste', true],

    /**
     * User stylesheet to include in the terminal document.
     */
    ['user-css', ''],
   ]);
};

hterm.PreferenceManager.prototype = {
  __proto__: lib.PreferenceManager.prototype
};
// SOURCE FILE: hterm/js/hterm_pubsub.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

/**
 * Utility class used to add publish/subscribe/unsubscribe functionality to
 * an existing object.
 */
hterm.PubSub = function() {
  this.observers_ = {};
};

/**
 * Add publish, subscribe, and unsubscribe methods to an existing object.
 *
 * No other properties of the object are touched, so there is no need to
 * worry about clashing private properties.
 *
 * @param {Object} obj The object to add this behavior to.
 */
hterm.PubSub.addBehavior = function(obj) {
  var pubsub = new hterm.PubSub();
  for (var m in hterm.PubSub.prototype) {
    obj[m] = hterm.PubSub.prototype[m].bind(pubsub);
  }
};

/**
 * Subscribe to be notified of messages about a subject.
 *
 * @param {string} subject The subject to subscribe to.
 * @param {function(Object)} callback The function to invoke for notifications.
 */
hterm.PubSub.prototype.subscribe = function(subject, callback) {
  if (!(subject in this.observers_))
    this.observers_[subject] = [];

  this.observers_[subject].push(callback);
};

/**
 * Unsubscribe from a subject.
 *
 * @param {string} subject The subject to unsubscribe from.
 * @param {function(Object)} callback A callback previously registered via
 *     subscribe().
 */
hterm.PubSub.prototype.unsubscribe = function(subject, callback) {
  var list = this.observers_[subject];
  if (!list)
    throw 'Invalid subject: ' + subject;

  var i = list.indexOf(callback);
  if (i < 0)
    throw 'Not subscribed: ' + subject;

  list.splice(i, 1);
};

/**
 * Publish a message about a subject.
 *
 * Subscribers (and the optional final callback) are invoked asynchronously.
 * This method will return before anyone is actually notified.
 *
 * @param {string} subject The subject to publish about.
 * @param {Object} e An arbitrary object associated with this notification.
 * @param {function(Object)} opt_lastCallback An optional function to call after
 *     all subscribers have been notified.
 */
hterm.PubSub.prototype.publish = function(subject, e, opt_lastCallback) {
  function notifyList(i) {
    // Set this timeout before invoking the callback, so we don't have to
    // concern ourselves with exceptions.
    if (i < list.length - 1)
      setTimeout(notifyList, 0, i + 1);

    list[i](e);
  }

  var list = this.observers_[subject];
  if (list) {
    // Copy the list, in case it changes while we're notifying.
    list = [].concat(list);
  }

  if (opt_lastCallback) {
    if (list) {
      list.push(opt_lastCallback);
    } else {
      list = [opt_lastCallback];
    }
  }

  if (list)
    setTimeout(notifyList, 0, 0);
};
// SOURCE FILE: hterm/js/hterm_screen.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.f', 'lib.wc',
          'hterm.RowCol', 'hterm.Size', 'hterm.TextAttributes');

/**
 * @fileoverview This class represents a single terminal screen full of text.
 *
 * It maintains the current cursor position and has basic methods for text
 * insert and overwrite, and adding or removing rows from the screen.
 *
 * This class has no knowledge of the scrollback buffer.
 *
 * The number of rows on the screen is determined only by the number of rows
 * that the caller inserts into the screen.  If a caller wants to ensure a
 * constant number of rows on the screen, it's their responsibility to remove a
 * row for each row inserted.
 *
 * The screen width, in contrast, is enforced locally.
 *
 *
 * In practice...
 * - The hterm.Terminal class holds two hterm.Screen instances.  One for the
 * primary screen and one for the alternate screen.
 *
 * - The html.Screen class only cares that rows are HTMLElements.  In the
 * larger context of hterm, however, the rows happen to be displayed by an
 * hterm.ScrollPort and have to follow a few rules as a result.  Each
 * row must be rooted by the custom HTML tag 'x-row', and each must have a
 * rowIndex property that corresponds to the index of the row in the context
 * of the scrollback buffer.  These invariants are enforced by hterm.Terminal
 * because that is the class using the hterm.Screen in the context of an
 * hterm.ScrollPort.
 */

/**
 * Create a new screen instance.
 *
 * The screen initially has no rows and a maximum column count of 0.
 *
 * @param {integer} opt_columnCount The maximum number of columns for this
 *    screen.  See insertString() and overwriteString() for information about
 *    what happens when too many characters are added too a row.  Defaults to
 *    0 if not provided.
 */
hterm.Screen = function(opt_columnCount) {
  /**
   * Public, read-only access to the rows in this screen.
   */
  this.rowsArray = [];

  // The max column width for this screen.
  this.columnCount_ = opt_columnCount || 80;

  // The current color, bold, underline and blink attributes.
  this.textAttributes = new hterm.TextAttributes(window.document);

  // Current zero-based cursor coordinates.
  this.cursorPosition = new hterm.RowCol(0, 0);

  // The node containing the row that the cursor is positioned on.
  this.cursorRowNode_ = null;

  // The node containing the span of text that the cursor is positioned on.
  this.cursorNode_ = null;

  // The offset in column width into cursorNode_ where the cursor is positioned.
  this.cursorOffset_ = null;
};

/**
 * Return the screen size as an hterm.Size object.
 *
 * @return {hterm.Size} hterm.Size object representing the current number
 *     of rows and columns in this screen.
 */
hterm.Screen.prototype.getSize = function() {
  return new hterm.Size(this.columnCount_, this.rowsArray.length);
};

/**
 * Return the current number of rows in this screen.
 *
 * @return {integer} The number of rows in this screen.
 */
hterm.Screen.prototype.getHeight = function() {
  return this.rowsArray.length;
};

/**
 * Return the current number of columns in this screen.
 *
 * @return {integer} The number of columns in this screen.
 */
hterm.Screen.prototype.getWidth = function() {
  return this.columnCount_;
};

/**
 * Set the maximum number of columns per row.
 *
 * @param {integer} count The maximum number of columns per row.
 */
hterm.Screen.prototype.setColumnCount = function(count) {
  this.columnCount_ = count;

  if (this.cursorPosition.column >= count)
    this.setCursorPosition(this.cursorPosition.row, count - 1);
};

/**
 * Remove the first row from the screen and return it.
 *
 * @return {HTMLElement} The first row in this screen.
 */
hterm.Screen.prototype.shiftRow = function() {
  return this.shiftRows(1)[0];
};

/**
 * Remove rows from the top of the screen and return them as an array.
 *
 * @param {integer} count The number of rows to remove.
 * @return {Array.<HTMLElement>} The selected rows.
 */
hterm.Screen.prototype.shiftRows = function(count) {
  return this.rowsArray.splice(0, count);
};

/**
 * Insert a row at the top of the screen.
 *
 * @param {HTMLElement} The row to insert.
 */
hterm.Screen.prototype.unshiftRow = function(row) {
  this.rowsArray.splice(0, 0, row);
};

/**
 * Insert rows at the top of the screen.
 *
 * @param {Array.<HTMLElement>} The rows to insert.
 */
hterm.Screen.prototype.unshiftRows = function(rows) {
  this.rowsArray.unshift.apply(this.rowsArray, rows);
};

/**
 * Remove the last row from the screen and return it.
 *
 * @return {HTMLElement} The last row in this screen.
 */
hterm.Screen.prototype.popRow = function() {
  return this.popRows(1)[0];
};

/**
 * Remove rows from the bottom of the screen and return them as an array.
 *
 * @param {integer} count The number of rows to remove.
 * @return {Array.<HTMLElement>} The selected rows.
 */
hterm.Screen.prototype.popRows = function(count) {
  return this.rowsArray.splice(this.rowsArray.length - count, count);
};

/**
 * Insert a row at the bottom of the screen.
 *
 * @param {HTMLElement} The row to insert.
 */
hterm.Screen.prototype.pushRow = function(row) {
  this.rowsArray.push(row);
};

/**
 * Insert rows at the bottom of the screen.
 *
 * @param {Array.<HTMLElement>} The rows to insert.
 */
hterm.Screen.prototype.pushRows = function(rows) {
  rows.push.apply(this.rowsArray, rows);
};

/**
 * Insert a row at the specified column of the screen.
 *
 * @param {HTMLElement} The row to insert.
 */
hterm.Screen.prototype.insertRow = function(index, row) {
  this.rowsArray.splice(index, 0, row);
};

/**
 * Insert rows at the specified column of the screen.
 *
 * @param {Array.<HTMLElement>} The rows to insert.
 */
hterm.Screen.prototype.insertRows = function(index, rows) {
  for (var i = 0; i < rows.length; i++) {
    this.rowsArray.splice(index + i, 0, rows[i]);
  }
};

/**
 * Remove a last row from the specified column of the screen and return it.
 *
 * @return {HTMLElement} The selected row.
 */
hterm.Screen.prototype.removeRow = function(index) {
  return this.rowsArray.splice(index, 1)[0];
};

/**
 * Remove rows from the bottom of the screen and return them as an array.
 *
 * @param {integer} count The number of rows to remove.
 * @return {Array.<HTMLElement>} The selected rows.
 */
hterm.Screen.prototype.removeRows = function(index, count) {
  return this.rowsArray.splice(index, count);
};

/**
 * Invalidate the current cursor position.
 *
 * This sets this.cursorPosition to (0, 0) and clears out some internal
 * data.
 *
 * Attempting to insert or overwrite text while the cursor position is invalid
 * will raise an obscure exception.
 */
hterm.Screen.prototype.invalidateCursorPosition = function() {
  this.cursorPosition.move(0, 0);
  this.cursorRowNode_ = null;
  this.cursorNode_ = null;
  this.cursorOffset_ = null;
};

/**
 * Clear the contents of the cursor row.
 */
hterm.Screen.prototype.clearCursorRow = function() {
  this.cursorRowNode_.innerHTML = '';
  this.cursorRowNode_.removeAttribute('line-overflow');
  this.cursorOffset_ = 0;
  this.cursorPosition.column = 0;
  this.cursorPosition.overflow = false;

  var text;
  if (this.textAttributes.isDefault()) {
    text = '';
  } else {
    text = lib.f.getWhitespace(this.columnCount_);
  }

  var node = this.textAttributes.createContainer(text);
  this.cursorRowNode_.appendChild(node);
  this.cursorNode_ = node;
};

/**
 * Mark the current row as having overflowed to the next line.
 *
 * The line overflow state is used when converting a range of rows into text.
 * It makes it possible to recombine two or more overflow terminal rows into
 * a single line.
 *
 * This is distinct from the cursor being in the overflow state.  Cursor
 * overflow indicates that printing at the cursor position will commit a
 * line overflow, unless it is preceded by a repositioning of the cursor
 * to a non-overflow state.
 */
hterm.Screen.prototype.commitLineOverflow = function() {
  this.cursorRowNode_.setAttribute('line-overflow', true);
};

/**
 * Relocate the cursor to a give row and column.
 *
 * @param {integer} row The zero based row.
 * @param {integer} column The zero based column.
 */
hterm.Screen.prototype.setCursorPosition = function(row, column) {
  if (!this.rowsArray.length) {
    console.warn('Attempt to set cursor position on empty screen.');
    return;
  }

  if (row >= this.rowsArray.length) {
    console.error('Row out of bounds: ' + row);
    row = this.rowsArray.length - 1;
  } else if (row < 0) {
    console.error('Row out of bounds: ' + row);
    row = 0;
  }

  if (column >= this.columnCount_) {
    console.error('Column out of bounds: ' + column);
    column = this.columnCount_ - 1;
  } else if (column < 0) {
    console.error('Column out of bounds: ' + column);
    column = 0;
  }

  this.cursorPosition.overflow = false;

  var rowNode = this.rowsArray[row];
  var node = rowNode.firstChild;

  if (!node) {
    node = rowNode.ownerDocument.createTextNode('');
    rowNode.appendChild(node);
  }

  var currentColumn = 0;

  if (rowNode == this.cursorRowNode_) {
    if (column >= this.cursorPosition.column - this.cursorOffset_) {
      node = this.cursorNode_;
      currentColumn = this.cursorPosition.column - this.cursorOffset_;
    }
  } else {
    this.cursorRowNode_ = rowNode;
  }

  this.cursorPosition.move(row, column);

  while (node) {
    var offset = column - currentColumn;
    var width = hterm.TextAttributes.nodeWidth(node);
    if (!node.nextSibling || width > offset) {
      this.cursorNode_ = node;
      this.cursorOffset_ = offset;
      return;
    }

    currentColumn += width;
    node = node.nextSibling;
  }
};

/**
 * Set the provided selection object to be a caret selection at the current
 * cursor position.
 */
hterm.Screen.prototype.syncSelectionCaret = function(selection) {
  selection.collapse(this.cursorNode_, this.cursorOffset_);
};

/**
 * Split a single node into two nodes at the given offset.
 *
 * For example:
 * Given the DOM fragment '<div><span>Hello World</span></div>', call splitNode_
 * passing the span and an offset of 6.  This would modifiy the fragment to
 * become: '<div><span>Hello </span><span>World</span></div>'.  If the span
 * had any attributes they would have been copied to the new span as well.
 *
 * The to-be-split node must have a container, so that the new node can be
 * placed next to it.
 *
 * @param {HTMLNode} node The node to split.
 * @param {integer} offset The offset into the node where the split should
 *     occur.
 */
hterm.Screen.prototype.splitNode_ = function(node, offset) {
  var afterNode = node.cloneNode(false);

  var textContent = node.textContent;
  node.textContent = hterm.TextAttributes.nodeSubstr(node, 0, offset);
  afterNode.textContent = lib.wc.substr(textContent, offset);

  if (afterNode.textContent)
    node.parentNode.insertBefore(afterNode, node.nextSibling);
  if (!node.textContent)
    node.parentNode.removeChild(node);
};

/**
 * Ensure that text is clipped and the cursor is clamped to the column count.
 */
hterm.Screen.prototype.maybeClipCurrentRow = function() {
  var width = hterm.TextAttributes.nodeWidth(this.cursorRowNode_);

  if (width <= this.columnCount_) {
    // Current row does not need clipping, but may need clamping.
    if (this.cursorPosition.column >= this.columnCount_) {
      this.setCursorPosition(this.cursorPosition.row, this.columnCount_ - 1);
      this.cursorPosition.overflow = true;
    }

    return;
  }

  // Save off the current column so we can maybe restore it later.
  var currentColumn = this.cursorPosition.column;

  // Move the cursor to the final column.
  this.setCursorPosition(this.cursorPosition.row, this.columnCount_ - 1);

  // Remove any text that partially overflows.
  width = hterm.TextAttributes.nodeWidth(this.cursorNode_);

  if (this.cursorOffset_ < width - 1) {
    this.cursorNode_.textContent = hterm.TextAttributes.nodeSubstr(
        this.cursorNode_, 0, this.cursorOffset_ + 1);
  }

  // Remove all nodes after the cursor.
  var rowNode = this.cursorRowNode_;
  var node = this.cursorNode_.nextSibling;

  while (node) {
    rowNode.removeChild(node);
    node = this.cursorNode_.nextSibling;
  }

  if (currentColumn < this.columnCount_) {
    // If the cursor was within the screen before we started then restore its
    // position.
    this.setCursorPosition(this.cursorPosition.row, currentColumn);
  } else {
    // Otherwise leave it at the the last column in the overflow state.
    this.cursorPosition.overflow = true;
  }
};

/**
 * Insert a string at the current character position using the current
 * text attributes.
 *
 * You must call maybeClipCurrentRow() after in order to clip overflowed
 * text and clamp the cursor.
 *
 * It is also up to the caller to properly maintain the line overflow state
 * using hterm.Screen..commitLineOverflow().
 */
hterm.Screen.prototype.insertString = function(str) {
  var cursorNode = this.cursorNode_;
  var cursorNodeText = cursorNode.textContent;

  this.cursorRowNode_.removeAttribute('line-overflow');

  // We may alter the width of the string by prepending some missing
  // whitespaces, so we need to record the string width ahead of time.
  var strWidth = lib.wc.strWidth(str);

  // No matter what, before this function exits the cursor column will have
  // moved this much.
  this.cursorPosition.column += strWidth;

  // Local cache of the cursor offset.
  var offset = this.cursorOffset_;

  // Reverse offset is the offset measured from the end of the string.
  // Zero implies that the cursor is at the end of the cursor node.
  var reverseOffset = hterm.TextAttributes.nodeWidth(cursorNode) - offset;

  if (reverseOffset < 0) {
    // A negative reverse offset means the cursor is positioned past the end
    // of the characters on this line.  We'll need to insert the missing
    // whitespace.
    var ws = lib.f.getWhitespace(-reverseOffset);

    // This whitespace should be completely unstyled.  Underline and background
    // color would be visible on whitespace, so we can't use one of those
    // spans to hold the text.
    if (!(this.textAttributes.underline || this.textAttributes.background ||
          this.textAttributes.wcNode)) {
      // Best case scenario, we can just pretend the spaces were part of the
      // original string.
      str = ws + str;
    } else if (cursorNode.nodeType == 3 ||
               !(cursorNode.wcNode ||
                 cursorNode.style.textDecoration ||
                 cursorNode.style.backgroundColor)) {
      // Second best case, the current node is able to hold the whitespace.
      cursorNode.textContent = (cursorNodeText += ws);
    } else {
      // Worst case, we have to create a new node to hold the whitespace.
      var wsNode = cursorNode.ownerDocument.createTextNode(ws);
      this.cursorRowNode_.insertBefore(wsNode, cursorNode.nextSibling);
      this.cursorNode_ = cursorNode = wsNode;
      this.cursorOffset_ = offset = -reverseOffset;
      cursorNodeText = ws;
    }

    // We now know for sure that we're at the last character of the cursor node.
    reverseOffset = 0;
  }

  if (this.textAttributes.matchesContainer(cursorNode)) {
    // The new text can be placed directly in the cursor node.
    if (reverseOffset == 0) {
      cursorNode.textContent = cursorNodeText + str;
    } else if (offset == 0) {
      cursorNode.textContent = str + cursorNodeText;
    } else {
      cursorNode.textContent =
          hterm.TextAttributes.nodeSubstr(cursorNode, 0, offset) +
          str + hterm.TextAttributes.nodeSubstr(cursorNode, offset);
    }

    this.cursorOffset_ += strWidth;
    return;
  }

  // The cursor node is the wrong style for the new text.  If we're at the
  // beginning or end of the cursor node, then the adjacent node is also a
  // potential candidate.

  if (offset == 0) {
    // At the beginning of the cursor node, the check the previous sibling.
    var previousSibling = cursorNode.previousSibling;
    if (previousSibling &&
        this.textAttributes.matchesContainer(previousSibling)) {
      previousSibling.textContent += str;
      this.cursorNode_ = previousSibling;
      this.cursorOffset_ = lib.wc.strWidth(previousSibling.textContent);
      return;
    }

    var newNode = this.textAttributes.createContainer(str);
    this.cursorRowNode_.insertBefore(newNode, cursorNode);
    this.cursorNode_ = newNode;
    this.cursorOffset_ = strWidth;
    return;
  }

  if (reverseOffset == 0) {
    // At the end of the cursor node, the check the next sibling.
    var nextSibling = cursorNode.nextSibling;
    if (nextSibling &&
        this.textAttributes.matchesContainer(nextSibling)) {
      nextSibling.textContent = str + nextSibling.textContent;
      this.cursorNode_ = nextSibling;
      this.cursorOffset_ = lib.wc.strWidth(str);
      return;
    }

    var newNode = this.textAttributes.createContainer(str);
    this.cursorRowNode_.insertBefore(newNode, nextSibling);
    this.cursorNode_ = newNode;
    // We specifically need to include any missing whitespace here, since it's
    // going in a new node.
    this.cursorOffset_ = hterm.TextAttributes.nodeWidth(newNode);
    return;
  }

  // Worst case, we're somewhere in the middle of the cursor node.  We'll
  // have to split it into two nodes and insert our new container in between.
  this.splitNode_(cursorNode, offset);
  var newNode = this.textAttributes.createContainer(str);
  this.cursorRowNode_.insertBefore(newNode, cursorNode.nextSibling);
  this.cursorNode_ = newNode;
  this.cursorOffset_ = strWidth;
};

/**
 * Overwrite the text at the current cursor position.
 *
 * You must call maybeClipCurrentRow() after in order to clip overflowed
 * text and clamp the cursor.
 *
 * It is also up to the caller to properly maintain the line overflow state
 * using hterm.Screen..commitLineOverflow().
 */
hterm.Screen.prototype.overwriteString = function(str) {
  var maxLength = this.columnCount_ - this.cursorPosition.column;
  if (!maxLength)
    return [str];

  var width = lib.wc.strWidth(str);
  if (this.textAttributes.matchesContainer(this.cursorNode_) &&
      this.cursorNode_.textContent.substr(this.cursorOffset_) == str) {
    // This overwrite would be a no-op, just move the cursor and return.
    this.cursorOffset_ += width;
    this.cursorPosition.column += width;
    return;
  }

  this.deleteChars(Math.min(width, maxLength));
  this.insertString(str);
};

/**
 * Forward-delete one or more characters at the current cursor position.
 *
 * Text to the right of the deleted characters is shifted left.  Only affects
 * characters on the same row as the cursor.
 *
 * @param {integer} count The column width of characters to delete.  This is
 *     clamped to the column width minus the cursor column.
 * @return {integer} The column width of the characters actually deleted.
 */
hterm.Screen.prototype.deleteChars = function(count) {
  var node = this.cursorNode_;
  var offset = this.cursorOffset_;

  var currentCursorColumn = this.cursorPosition.column;
  count = Math.min(count, this.columnCount_ - currentCursorColumn);
  if (!count)
    return 0;

  var rv = count;
  var startLength, endLength;

  while (node && count) {
    startLength = hterm.TextAttributes.nodeWidth(node);
    node.textContent = hterm.TextAttributes.nodeSubstr(node, 0, offset) +
        hterm.TextAttributes.nodeSubstr(node, offset + count);
    endLength = hterm.TextAttributes.nodeWidth(node);
    count -= startLength - endLength;
    if (offset < startLength && endLength && startLength == endLength) {
      // No characters were deleted when there should be.  We're probably trying
      // to delete one column width from a wide character node.  We remove the
      // wide character node here and replace it with a single space.
      var spaceNode = this.textAttributes.createContainer(' ');
      node.parentNode.insertBefore(spaceNode, node.nextSibling);
      node.textContent = '';
      endLength = 0;
      count -= 1;
    }

    var nextNode = node.nextSibling;
    if (endLength == 0 && node != this.cursorNode_) {
      node.parentNode.removeChild(node);
    }
    node = nextNode;
    offset = 0;
  }

  // Remove this.cursorNode_ if it is an empty non-text node.
  if (this.cursorNode_.nodeType != 3 && !this.cursorNode_.textContent) {
    var cursorNode = this.cursorNode_;
    if (cursorNode.previousSibling) {
      this.cursorNode_ = cursorNode.previousSibling;
      this.cursorOffset_ = hterm.TextAttributes.nodeWidth(
          cursorNode.previousSibling);
    } else if (cursorNode.nextSibling) {
      this.cursorNode_ = cursorNode.nextSibling;
      this.cursorOffset_ = 0;
    } else {
      var emptyNode = this.cursorRowNode_.ownerDocument.createTextNode('');
      this.cursorRowNode_.appendChild(emptyNode);
      this.cursorNode_ = emptyNode;
      this.cursorOffset_ = 0;
    }
    this.cursorRowNode_.removeChild(cursorNode);
  }

  return rv;
};

/**
 * Finds first X-ROW of a line containing specified X-ROW.
 * Used to support line overflow.
 *
 * @param {Node} row X-ROW to begin search for first row of line.
 * @return {Node} The X-ROW that is at the beginning of the line.
 **/
hterm.Screen.prototype.getLineStartRow_ = function(row) {
  while (row.previousSibling &&
         row.previousSibling.hasAttribute('line-overflow')) {
    row = row.previousSibling;
  }
  return row;
};

/**
 * Gets text of a line beginning with row.
 * Supports line overflow.
 *
 * @param {Node} row First X-ROW of line.
 * @return {string} Text content of line.
 **/
hterm.Screen.prototype.getLineText_ = function(row) {
  var rowText = "";
  while (row) {
    rowText += row.textContent;
    if (row.hasAttribute('line-overflow')) {
      row = row.nextSibling;
    } else {
      break;
    }
  }
  return rowText;
};

/**
 * Returns X-ROW that is ancestor of the node.
 *
 * @param {Node} node Node to get X-ROW ancestor for.
 * @return {Node} X-ROW ancestor of node, or null if not found.
 **/
hterm.Screen.prototype.getXRowAncestor_ = function(node) {
  while (node) {
    if (node.nodeName === 'X-ROW')
      break;
    node = node.parentNode;
  }
  return node;
};

/**
 * Returns position within line of character at offset within node.
 * Supports line overflow.
 *
 * @param {Node} row X-ROW at beginning of line.
 * @param {Node} node Node to get position of.
 * @param {integer} offset Offset into node.
 *
 * @return {integer} Position within line of character at offset within node.
 **/
hterm.Screen.prototype.getPositionWithOverflow_ = function(row, node, offset) {
  if (!node)
    return -1;
  var ancestorRow = this.getXRowAncestor_(node);
  if (!ancestorRow)
    return -1;
  var position = 0;
  while (ancestorRow != row) {
    position += hterm.TextAttributes.nodeWidth(row);
    if (row.hasAttribute('line-overflow') && row.nextSibling) {
      row = row.nextSibling;
    } else {
      return -1;
    }
  }
  return position + this.getPositionWithinRow_(row, node, offset);
};

/**
 * Returns position within row of character at offset within node.
 * Does not support line overflow.
 *
 * @param {Node} row X-ROW to get position within.
 * @param {Node} node Node to get position for.
 * @param {integer} offset Offset within node to get position for.
 * @return {integer} Position within row of character at offset within node.
 **/
hterm.Screen.prototype.getPositionWithinRow_ = function(row, node, offset) {
  if (node.parentNode != row) {
    return this.getPositionWithinRow_(node.parentNode, node, offset) +
           this.getPositionWithinRow_(row, node.parentNode, 0);
  }
  var position = 0;
  for (var i = 0; i < row.childNodes.length; i++) {
    var currentNode = row.childNodes[i];
    if (currentNode == node)
      return position + offset;
    position += hterm.TextAttributes.nodeWidth(currentNode);
  }
  return -1;
};

/**
 * Returns the node and offset corresponding to position within line.
 * Supports line overflow.
 *
 * @param {Node} row X-ROW at beginning of line.
 * @param {integer} position Position within line to retrieve node and offset.
 * @return {Array} Two element array containing node and offset respectively.
 **/
hterm.Screen.prototype.getNodeAndOffsetWithOverflow_ = function(row, position) {
  while (row && position > hterm.TextAttributes.nodeWidth(row)) {
    if (row.hasAttribute('line-overflow') && row.nextSibling) {
      position -= hterm.TextAttributes.nodeWidth(row);
      row = row.nextSibling;
    } else {
      return -1;
    }
  }
  return this.getNodeAndOffsetWithinRow_(row, position);
};

/**
 * Returns the node and offset corresponding to position within row.
 * Does not support line overflow.
 *
 * @param {Node} row X-ROW to get position within.
 * @param {integer} position Position within row to retrieve node and offset.
 * @return {Array} Two element array containing node and offset respectively.
 **/
hterm.Screen.prototype.getNodeAndOffsetWithinRow_ = function(row, position) {
  for (var i = 0; i < row.childNodes.length; i++) {
    var node = row.childNodes[i];
    var nodeTextWidth = hterm.TextAttributes.nodeWidth(node);
    if (position <= nodeTextWidth) {
      if (node.nodeName === 'SPAN') {
        /** Drill down to node contained by SPAN. **/
        return this.getNodeAndOffsetWithinRow_(node, position);
      } else {
        return [node, position];
      }
    }
    position -= nodeTextWidth;
  }
  return null;
};

/**
 * Returns the node and offset corresponding to position within line.
 * Supports line overflow.
 *
 * @param {Node} row X-ROW at beginning of line.
 * @param {integer} start Start position of range within line.
 * @param {integer} end End position of range within line.
 * @param {Range} range Range to modify.
 **/
hterm.Screen.prototype.setRange_ = function(row, start, end, range) {
  var startNodeAndOffset = this.getNodeAndOffsetWithOverflow_(row, start);
  if (startNodeAndOffset == null)
    return;
  var endNodeAndOffset = this.getNodeAndOffsetWithOverflow_(row, end);
  if (endNodeAndOffset == null)
    return;
  range.setStart(startNodeAndOffset[0], startNodeAndOffset[1]);
  range.setEnd(endNodeAndOffset[0], endNodeAndOffset[1]);
};

/**
 * Expands selection to surround URLs.
 *
 * Uses this regular expression to expand the selection:
 * [^\s\[\](){}<>"'\^!@#$%&*,.;:~`]
 * [^\s\[\](){}<>"'\^]*
 * [^\s\[\](){}<>"'\^!@#$%&*,.;:~`]
 *
 * @param {Selection} selection Selection to expand.
 **/
hterm.Screen.prototype.expandSelection = function(selection) {
  if (!selection)
    return;

  var range = selection.getRangeAt(0);
  if (!range || range.toString().match(/\s/))
    return;

  var row = this.getLineStartRow_(this.getXRowAncestor_(range.startContainer));
  if (!row)
    return;

  var startPosition = this.getPositionWithOverflow_(row,
                                                    range.startContainer,
                                                    range.startOffset);
  if (startPosition == -1)
    return;
  var endPosition = this.getPositionWithOverflow_(row,
                                                  range.endContainer,
                                                  range.endOffset);
  if (endPosition == -1)
    return;

  var outsideMatch = '[^\\s\\[\\](){}<>"\'\\^!@#$%&*,.;:~`]';
  var insideMatch = '[^\\s\\[\\](){}<>"\'\\^]*';

  //Move start to the left.
  var rowText = this.getLineText_(row);
  var lineUpToRange = lib.wc.substring(rowText, 0, endPosition);
  var leftRegularExpression = new RegExp(outsideMatch + insideMatch + "$");
  var expandedStart = lineUpToRange.search(leftRegularExpression);
  if (expandedStart == -1 || expandedStart > startPosition)
    return;

  //Move end to the right.
  var lineFromRange = lib.wc.substring(rowText, startPosition,
                                       lib.wc.strWidth(rowText));
  var rightRegularExpression = new RegExp("^" + insideMatch + outsideMatch);
  var found = lineFromRange.match(rightRegularExpression);
  if (!found)
    return;
  var expandedEnd = startPosition + lib.wc.strWidth(found[0]);
  if (expandedEnd == -1 || expandedEnd < endPosition)
    return;

  this.setRange_(row, expandedStart, expandedEnd, range);
  selection.addRange(range);
};
// SOURCE FILE: hterm/js/hterm_scrollport.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('hterm.PubSub', 'hterm.Size');

/**
 * A 'viewport' view of fixed-height rows with support for selection and
 * copy-to-clipboard.
 *
 * 'Viewport' in this case means that only the visible rows are in the DOM.
 * If the rowProvider has 100,000 rows, but the ScrollPort is only 25 rows
 * tall, then only 25 dom nodes are created.  The ScrollPort will ask the
 * RowProvider to create new visible rows on demand as they are scrolled in
 * to the visible area.
 *
 * This viewport is designed so that select and copy-to-clipboard still works,
 * even when all or part of the selection is scrolled off screen.
 *
 * Note that the X11 mouse clipboard does not work properly when all or part
 * of the selection is off screen.  It would be difficult to fix this without
 * adding significant overhead to pathologically large selection cases.
 *
 * The RowProvider should return rows rooted by the custom tag name 'x-row'.
 * This ensures that we can quickly assign the correct display height
 * to the rows with css.
 *
 * @param {RowProvider} rowProvider An object capable of providing rows as
 *     raw text or row nodes.
 */
hterm.ScrollPort = function(rowProvider) {
  hterm.PubSub.addBehavior(this);

  this.rowProvider_ = rowProvider;

  // SWAG the character size until we can measure it.
  this.characterSize = new hterm.Size(10, 10);

  // DOM node used for character measurement.
  this.ruler_ = null;

  this.selection = new hterm.ScrollPort.Selection(this);

  // A map of rowIndex => rowNode for each row that is drawn as part of a
  // pending redraw_() call.  Null if there is no pending redraw_ call.
  this.currentRowNodeCache_ = null;

  // A map of rowIndex => rowNode for each row that was drawn as part of the
  // previous redraw_() call.
  this.previousRowNodeCache_ = {};

  // Used during scroll events to detect when the underlying cause is a resize.
  this.lastScreenWidth_ = null;
  this.lastScreenHeight_ = null;

  // True if the user should be allowed to select text in the terminal.
  // This is disabled when the host requests mouse drag events so that we don't
  // end up with two notions of selection.
  this.selectionEnabled_ = true;

  // The last row count returned by the row provider, re-populated during
  // syncScrollHeight().
  this.lastRowCount_ = 0;

  /**
   * True if the last scroll caused the scrollport to show the final row.
   */
  this.isScrolledEnd = true;

  // The css rule that we use to control the height of a row.
  this.xrowCssRule_ = null;

  /**
   * A guess at the current scrollbar width, fixed in resize().
   */
  this.currentScrollbarWidthPx = 16

  this.div_ = null;
  this.document_ = null;

  // Collection of active timeout handles.
  this.timeouts_ = {};

  this.observers_ = {};

  this.DEBUG_ = false;
}

/**
 * Proxy for the native selection object which understands how to walk up the
 * DOM to find the containing row node and sort out which comes first.
 *
 * @param {hterm.ScrollPort} scrollPort The parent hterm.ScrollPort instance.
 */
hterm.ScrollPort.Selection = function(scrollPort) {
  this.scrollPort_ = scrollPort;

  /**
   * The row containing the start of the selection.
   *
   * This may be partially or fully selected.  It may be the selection anchor
   * or the focus, but its rowIndex is guaranteed to be less-than-or-equal-to
   * that of the endRow.
   *
   * If only one row is selected then startRow == endRow.  If there is no
   * selection or the selection is collapsed then startRow == null.
   */
  this.startRow = null;

  /**
   * The row containing the end of the selection.
   *
   * This may be partially or fully selected.  It may be the selection anchor
   * or the focus, but its rowIndex is guaranteed to be greater-than-or-equal-to
   * that of the startRow.
   *
   * If only one row is selected then startRow == endRow.  If there is no
   * selection or the selection is collapsed then startRow == null.
   */
  this.endRow = null;

  /**
   * True if startRow != endRow.
   */
  this.isMultiline = null;

  /**
   * True if the selection is just a point rather than a range.
   */
  this.isCollapsed = null;
};

/**
 * Given a list of DOM nodes and a container, return the DOM node that
 * is first according to a depth-first search.
 *
 * Returns null if none of the children are found.
 */
hterm.ScrollPort.Selection.prototype.findFirstChild = function(
    parent, childAry) {
  var node = parent.firstChild;

  while (node) {
    if (childAry.indexOf(node) != -1)
      return node;

    if (node.childNodes.length) {
      var rv = this.findFirstChild(node, childAry);
      if (rv)
        return rv;
    }

    node = node.nextSibling;
  }

  return null;
};

/**
 * Synchronize this object with the current DOM selection.
 *
 * This is a one-way synchronization, the DOM selection is copied to this
 * object, not the other way around.
 */
hterm.ScrollPort.Selection.prototype.sync = function() {
  var self = this;

  // The dom selection object has no way to tell which nodes come first in
  // the document, so we have to figure that out.
  //
  // This function is used when we detect that the "anchor" node is first.
  function anchorFirst() {
    self.startRow = anchorRow;
    self.startNode = selection.anchorNode;
    self.startOffset = selection.anchorOffset;
    self.endRow = focusRow;
    self.endNode = selection.focusNode;
    self.endOffset = selection.focusOffset;
  }

  // This function is used when we detect that the "focus" node is first.
  function focusFirst() {
    self.startRow = focusRow;
    self.startNode = selection.focusNode;
    self.startOffset = selection.focusOffset;
    self.endRow = anchorRow;
    self.endNode = selection.anchorNode;
    self.endOffset = selection.anchorOffset;
  }

  var selection = this.scrollPort_.getDocument().getSelection();

  this.startRow = null;
  this.endRow = null;
  this.isMultiline = null;
  this.isCollapsed = !selection || selection.isCollapsed;

  if (this.isCollapsed)
    return;

  var anchorRow = selection.anchorNode;
  while (anchorRow && !('rowIndex' in anchorRow)) {
    anchorRow = anchorRow.parentNode;
  }

  if (!anchorRow) {
    console.error('Selection anchor is not rooted in a row node: ' +
                  selection.anchorNode.nodeName);
    return;
  }

  var focusRow = selection.focusNode;
  while (focusRow && !('rowIndex' in focusRow)) {
    focusRow = focusRow.parentNode;
  }

  if (!focusRow) {
    console.error('Selection focus is not rooted in a row node: ' +
                  selection.focusNode.nodeName);
    return;
  }

  if (anchorRow.rowIndex < focusRow.rowIndex) {
    anchorFirst();

  } else if (anchorRow.rowIndex > focusRow.rowIndex) {
    focusFirst();

  } else if (selection.focusNode == selection.anchorNode) {
    if (selection.anchorOffset < selection.focusOffset) {
      anchorFirst();
    } else {
      focusFirst();
    }

  } else {
    // The selection starts and ends in the same row, but isn't contained all
    // in a single node.
    var firstNode = this.findFirstChild(
        anchorRow, [selection.anchorNode, selection.focusNode]);

    if (!firstNode)
      throw new Error('Unexpected error syncing selection.');

    if (firstNode == selection.anchorNode) {
      anchorFirst();
    } else {
      focusFirst();
    }
  }

  this.isMultiline = anchorRow.rowIndex != focusRow.rowIndex;
};

/**
 * Turn a div into this hterm.ScrollPort.
 */
hterm.ScrollPort.prototype.decorate = function(div) {
  this.div_ = div;

  this.iframe_ = div.ownerDocument.createElement('iframe');
  this.iframe_.style.cssText = (
      'border: 0;' +
      'height: 100%;' +
      'position: absolute;' +
      'width: 100%');

  div.appendChild(this.iframe_);

  this.iframe_.contentWindow.addEventListener('resize',
                                              this.onResize_.bind(this));

  var doc = this.document_ = this.iframe_.contentDocument;
  doc.body.style.cssText = (
      'margin: 0px;' +
      'padding: 0px;' +
      'height: 100%;' +
      'width: 100%;' +
      'overflow: hidden;' +
      '-webkit-user-select: none;');

  var style = doc.createElement('style');
  style.textContent = 'x-row {}';
  doc.head.appendChild(style);

  this.xrowCssRule_ = doc.styleSheets[0].cssRules[0];
  this.xrowCssRule_.style.display = 'block';

  this.userCssLink_ = doc.createElement('link');
  this.userCssLink_.setAttribute('rel', 'stylesheet');

  // TODO(rginda): Sorry, this 'screen_' isn't the same thing as hterm.Screen
  // from screen.js.  I need to pick a better name for one of them to avoid
  // the collision.
  this.screen_ = doc.createElement('x-screen');
  this.screen_.setAttribute('role', 'textbox');
  this.screen_.setAttribute('tabindex', '-1');
  this.screen_.style.cssText = (
      'display: block;' +
      'font-family: monospace;' +
      'font-size: 15px;' +
      'height: 100%;' +
      'overflow-y: scroll; overflow-x: hidden;' +
      'white-space: pre;' +
      'width: 100%;' +
      'outline: none !important');

  doc.body.appendChild(this.screen_);

  this.screen_.addEventListener('scroll', this.onScroll_.bind(this));
  this.screen_.addEventListener('mousewheel', this.onScrollWheel_.bind(this));
  this.screen_.addEventListener('copy', this.onCopy_.bind(this));
  this.screen_.addEventListener('paste', this.onPaste_.bind(this));

  // We send focus to this element just before a paste happens, so we can
  // capture the pasted text and forward it on to someone who cares.
  this.pasteTarget_ = doc.createElement('textarea');
  this.pasteTarget_.setAttribute('tabindex', '-1');
  this.pasteTarget_.style.cssText = (
    'position: absolute;' +
    'top: -999px;');

  doc.body.appendChild(this.pasteTarget_);

  // This is the main container for the fixed rows.
  this.rowNodes_ = doc.createElement('div');
  this.rowNodes_.style.cssText = (
      'display: block;' +
      'position: fixed;' +
      'overflow: hidden;' +
      '-webkit-user-select: text;');
  this.screen_.appendChild(this.rowNodes_);

  // Two nodes to hold offscreen text during the copy event.
  this.topSelectBag_ = doc.createElement('x-select-bag');
  this.topSelectBag_.style.cssText = (
      'display: block;' +
      'overflow: hidden;' +
      'white-space: pre;');

  this.bottomSelectBag_ = this.topSelectBag_.cloneNode();

  // Nodes above the top fold and below the bottom fold are hidden.  They are
  // only used to hold rows that are part of the selection but are currently
  // scrolled off the top or bottom of the visible range.
  this.topFold_ = doc.createElement('x-fold');
  this.topFold_.style.cssText = 'display: block;';
  this.rowNodes_.appendChild(this.topFold_);

  this.bottomFold_ = this.topFold_.cloneNode();
  this.rowNodes_.appendChild(this.bottomFold_);

  // This hidden div accounts for the vertical space that would be consumed by
  // all the rows in the buffer if they were visible.  It's what causes the
  // scrollbar to appear on the 'x-screen', and it moves within the screen when
  // the scrollbar is moved.
  //
  // It is set 'visibility: hidden' to keep the browser from trying to include
  // it in the selection when a user 'drag selects' upwards (drag the mouse to
  // select and scroll at the same time).  Without this, the selection gets
  // out of whack.
  this.scrollArea_ = doc.createElement('div');
  this.scrollArea_.style.cssText = 'visibility: hidden';
  this.screen_.appendChild(this.scrollArea_);

  // This svg element is used to detect when the browser is zoomed.  It must be
  // placed in the outermost document for currentScale to be correct.
  // TODO(rginda): This means that hterm nested in an iframe will not correctly
  // detect browser zoom level.  We should come up with a better solution.
  this.svg_ = this.div_.ownerDocument.createElementNS(
      'http://www.w3.org/2000/svg', 'svg');
  this.svg_.setAttribute('xmlns', 'http://www.w3.org/2000/svg');
  this.svg_.setAttribute('version', '1.1');
  this.svg_.style.cssText = (
      'position: absolute;' +
      'top: 0;' +
      'left: 0;' +
      'visibility: hidden');

  this.resize();
};

/**
 * Select the font-family and font-smoothing for this scrollport.
 *
 * @param {string} fontFamily Value of the CSS 'font-family' to use for this
 *     scrollport.  Should be a monospace font.
 * @param {string} opt_smoothing Optional value for '-webkit-font-smoothing'.
 *     Defaults to an empty string if not specified.
 */
hterm.ScrollPort.prototype.setFontFamily = function(fontFamily, opt_smoothing) {
  this.screen_.style.fontFamily = fontFamily;
  if (opt_smoothing) {
    this.screen_.style.webkitFontSmoothing = opt_smoothing;
  } else {
    this.screen_.style.webkitFontSmoothing = '';
  }

  this.syncCharacterSize();
};

hterm.ScrollPort.prototype.getFontFamily = function() {
  return this.screen_.style.fontFamily;
};

/**
 * Set a custom stylesheet to include in the scrollport.
 *
 * Defaults to null, meaning no custom css is loaded.  Set it back to null or
 * the empty string to remove a previously applied custom css.
 */
hterm.ScrollPort.prototype.setUserCss = function(url) {
  if (url) {
    this.userCssLink_.setAttribute('href', url);

    if (!this.userCssLink_.parentNode)
      this.document_.head.appendChild(this.userCssLink_);
  } else if (this.userCssLink_.parentNode) {
    this.document_.head.removeChild(this.userCssLink_);
  }
};

hterm.ScrollPort.prototype.focus = function() {
  this.iframe_.focus();
  this.screen_.focus();
};

hterm.ScrollPort.prototype.getForegroundColor = function() {
  return this.screen_.style.color;
};

hterm.ScrollPort.prototype.setForegroundColor = function(color) {
  this.screen_.style.color = color;
};

hterm.ScrollPort.prototype.getBackgroundColor = function() {
  return this.screen_.style.backgroundColor;
};

hterm.ScrollPort.prototype.setBackgroundColor = function(color) {
  this.screen_.style.backgroundColor = color;
};

hterm.ScrollPort.prototype.setBackgroundImage = function(image) {
  this.screen_.style.backgroundImage = image;
};

hterm.ScrollPort.prototype.setBackgroundSize = function(size) {
  this.screen_.style.backgroundSize = size;
};

hterm.ScrollPort.prototype.setBackgroundPosition = function(position) {
  this.screen_.style.backgroundPosition = position;
};

/**
 * Get the usable size of the scrollport screen.
 *
 * The width will not include the scrollbar width.
 */
hterm.ScrollPort.prototype.getScreenSize = function() {
  var size = hterm.getClientSize(this.screen_);
  return {
    height: size.height,
    width: size.width - this.currentScrollbarWidthPx
  };
};

/**
 * Get the usable width of the scrollport screen.
 *
 * This the widget width minus scrollbar width.
 */
hterm.ScrollPort.prototype.getScreenWidth = function() {
  return this.getScreenSize().width ;
};

/**
 * Get the usable height of the scrollport screen.
 */
hterm.ScrollPort.prototype.getScreenHeight = function() {
  return this.getScreenSize().height;
};

/**
 * Return the document that holds the visible rows of this hterm.ScrollPort.
 */
hterm.ScrollPort.prototype.getDocument = function() {
  return this.document_;
};

/**
 * Returns the x-screen element that holds the rows of this hterm.ScrollPort.
 */
hterm.ScrollPort.prototype.getScreenNode = function() {
  return this.screen_;
};

/**
 * Clear out any cached rowNodes.
 */
hterm.ScrollPort.prototype.resetCache = function() {
  this.currentRowNodeCache_ = null;
  this.previousRowNodeCache_ = {};
};

/**
 * Change the current rowProvider.
 *
 * This will clear the row cache and cause a redraw.
 *
 * @param {Object} rowProvider An object capable of providing the rows
 *     in this hterm.ScrollPort.
 */
hterm.ScrollPort.prototype.setRowProvider = function(rowProvider) {
  this.resetCache();
  this.rowProvider_ = rowProvider;
  this.scheduleRedraw();
};

/**
 * Inform the ScrollPort that the root DOM nodes for some or all of the visible
 * rows are no longer valid.
 *
 * Specifically, this should be called if this.rowProvider_.getRowNode() now
 * returns an entirely different node than it did before.  It does not
 * need to be called if the content of a row node is the only thing that
 * changed.
 *
 * This skips some of the overhead of a full redraw, but should not be used
 * in cases where the scrollport has been scrolled, or when the row count has
 * changed.
 */
hterm.ScrollPort.prototype.invalidate = function() {
  var node = this.topFold_.nextSibling;
  while (node != this.bottomFold_) {
    var nextSibling = node.nextSibling;
    node.parentElement.removeChild(node);
    node = nextSibling;
  }

  this.previousRowNodeCache_ = null;
  var topRowIndex = this.getTopRowIndex();
  var bottomRowIndex = this.getBottomRowIndex(topRowIndex);

  this.drawVisibleRows_(topRowIndex, bottomRowIndex);
};

hterm.ScrollPort.prototype.scheduleInvalidate = function() {
  if (this.timeouts_.invalidate)
    return;

  var self = this;
  this.timeouts_.invalidate = setTimeout(function () {
      delete self.timeouts_.invalidate;
      self.invalidate();
    }, 0);
};

/**
 * Set the font size of the ScrollPort.
 */
hterm.ScrollPort.prototype.setFontSize = function(px) {
  this.screen_.style.fontSize = px + 'px';
  this.syncCharacterSize();
};

/**
 * Return the current font size of the ScrollPort.
 */
hterm.ScrollPort.prototype.getFontSize = function() {
  return parseInt(this.screen_.style.fontSize);
};

/**
 * Measure the size of a single character in pixels.
 *
 * @param {string} opt_weight The font weight to measure, or 'normal' if
 *     omitted.
 * @return {hterm.Size} A new hterm.Size object.
 */
hterm.ScrollPort.prototype.measureCharacterSize = function(opt_weight) {
  if (!this.ruler_) {
    this.ruler_ = this.document_.createElement('div');
    this.ruler_.style.cssText = (
        'position: absolute;' +
        'top: 0;' +
        'left: 0;' +
        'visibility: hidden;' +
        'height: auto !important;' +
        'width: auto !important;');

    this.ruler_.textContent = ('XXXXXXXXXXXXXXXXXXXX' +
                               'XXXXXXXXXXXXXXXXXXXX' +
                               'XXXXXXXXXXXXXXXXXXXX' +
                               'XXXXXXXXXXXXXXXXXXXX' +
                               'XXXXXXXXXXXXXXXXXXXX');

    this.rulerBaseline_ = this.document_.createElement('span');
    // We want to collapse it on the baseline
    this.rulerBaseline_.style.fontSize = '0px';
    this.rulerBaseline_.textContent = 'X';
  }

  this.ruler_.style.fontWeight = opt_weight || '';

  this.rowNodes_.appendChild(this.ruler_);
  var rulerSize = hterm.getClientSize(this.ruler_);

  // In some fonts, underscores actually show up below the reported height.
  // We add one to the height here to compensate, and have to add a bottom
  // border to text with a background color over in text_attributes.js.
  var size = new hterm.Size(rulerSize.width / this.ruler_.textContent.length,
                            rulerSize.height + 1);

  this.ruler_.appendChild(this.rulerBaseline_);
  size.baseline = this.rulerBaseline_.offsetTop;
  this.ruler_.removeChild(this.rulerBaseline_);

  this.rowNodes_.removeChild(this.ruler_);

  this.div_.ownerDocument.body.appendChild(this.svg_);
  size.zoomFactor = this.svg_.currentScale;
  this.div_.ownerDocument.body.removeChild(this.svg_);

  return size;
};

/**
 * Synchronize the character size.
 *
 * This will re-measure the current character size and adjust the height
 * of an x-row to match.
 */
hterm.ScrollPort.prototype.syncCharacterSize = function() {
  this.characterSize = this.measureCharacterSize();

  var lineHeight = this.characterSize.height + 'px';
  this.xrowCssRule_.style.height = lineHeight;
  this.topSelectBag_.style.height = lineHeight;
  this.bottomSelectBag_.style.height = lineHeight;

  this.resize();

  if (this.DEBUG_) {
    // When we're debugging we add padding to the body so that the offscreen
    // elements are visible.
    this.document_.body.style.paddingTop =
        this.document_.body.style.paddingBottom =
        3 * this.characterSize.height + 'px';
  }
};

/**
 * Reset dimensions and visible row count to account for a change in the
 * dimensions of the 'x-screen'.
 */
hterm.ScrollPort.prototype.resize = function() {
  this.currentScrollbarWidthPx = hterm.getClientWidth(this.screen_) -
    this.screen_.clientWidth;

  this.syncScrollHeight();
  this.syncRowNodesDimensions_();

  var self = this;
  this.publish(
      'resize', { scrollPort: this },
      function() {
        self.scrollRowToBottom(self.rowProvider_.getRowCount());
        self.scheduleRedraw();
      });
};

/**
 * Set the position and size of the row nodes element.
 */
hterm.ScrollPort.prototype.syncRowNodesDimensions_ = function() {
  var screenSize = this.getScreenSize();

  this.lastScreenWidth_ = screenSize.width;
  this.lastScreenHeight_ = screenSize.height;

  // We don't want to show a partial row because it would be distracting
  // in a terminal, so we floor any fractional row count.
  this.visibleRowCount = Math.floor(
      screenSize.height / this.characterSize.height);

  // Then compute the height of our integral number of rows.
  var visibleRowsHeight = this.visibleRowCount * this.characterSize.height;

  // Then the difference between the screen height and total row height needs to
  // be made up for as top margin.  We need to record this value so it
  // can be used later to determine the topRowIndex.
  this.visibleRowTopMargin = 0;
  this.visibleRowBottomMargin = screenSize.height - visibleRowsHeight;

  this.topFold_.style.marginBottom = this.visibleRowTopMargin + 'px';


  var topFoldOffset = 0;
  var node = this.topFold_.previousSibling;
  while (node) {
    topFoldOffset += hterm.getClientHeight(node);
    node = node.previousSibling;
  }

  // Set the dimensions of the visible rows container.
  this.rowNodes_.style.width = screenSize.width + 'px';
  this.rowNodes_.style.height = visibleRowsHeight + topFoldOffset + 'px';
  this.rowNodes_.style.left = this.screen_.offsetLeft + 'px';
  this.rowNodes_.style.top = this.screen_.offsetTop - topFoldOffset + 'px';
};

hterm.ScrollPort.prototype.syncScrollHeight = function() {
  // Resize the scroll area to appear as though it contains every row.
  this.lastRowCount_ = this.rowProvider_.getRowCount();
  this.scrollArea_.style.height = (this.characterSize.height *
                                   this.lastRowCount_ +
                                   this.visibleRowTopMargin +
                                   this.visibleRowBottomMargin +
                                   'px');
};

/**
 * Schedule a redraw to happen asynchronously.
 *
 * If this method is called multiple times before the redraw has a chance to
 * run only one redraw occurs.
 */
hterm.ScrollPort.prototype.scheduleRedraw = function() {
  if (this.timeouts_.redraw)
    return;

  var self = this;
  this.timeouts_.redraw = setTimeout(function () {
      delete self.timeouts_.redraw;
      self.redraw_();
    }, 0);
};

/**
 * Redraw the current hterm.ScrollPort based on the current scrollbar position.
 *
 * When redrawing, we are careful to make sure that the rows that start or end
 * the current selection are not touched in any way.  Doing so would disturb
 * the selection, and cleaning up after that would cause flashes at best and
 * incorrect selection at worst.  Instead, we modify the DOM around these nodes.
 * We even stash the selection start/end outside of the visible area if
 * they are not supposed to be visible in the hterm.ScrollPort.
 */
hterm.ScrollPort.prototype.redraw_ = function() {
  this.resetSelectBags_();
  this.selection.sync();

  this.syncScrollHeight();

  this.currentRowNodeCache_ = {};

  var topRowIndex = this.getTopRowIndex();
  var bottomRowIndex = this.getBottomRowIndex(topRowIndex);

  this.drawTopFold_(topRowIndex);
  this.drawBottomFold_(bottomRowIndex);
  this.drawVisibleRows_(topRowIndex, bottomRowIndex);

  this.syncRowNodesDimensions_();

  this.previousRowNodeCache_ = this.currentRowNodeCache_;
  this.currentRowNodeCache_ = null;

  this.isScrolledEnd = (
    this.getTopRowIndex() + this.visibleRowCount >= this.lastRowCount_);
};

/**
 * Ensure that the nodes above the top fold are as they should be.
 *
 * If the selection start and/or end nodes are above the visible range
 * of this hterm.ScrollPort then the dom will be adjusted so that they appear
 * before the top fold (the first x-fold element, aka this.topFold).
 *
 * If not, the top fold will be the first element.
 *
 * It is critical that this method does not move the selection nodes.  Doing
 * so would clear the current selection.  Instead, the rest of the DOM is
 * adjusted around them.
 */
hterm.ScrollPort.prototype.drawTopFold_ = function(topRowIndex) {
  if (!this.selection.startRow ||
      this.selection.startRow.rowIndex >= topRowIndex) {
    // Selection is entirely below the top fold, just make sure the fold is
    // the first child.
    if (this.rowNodes_.firstChild != this.topFold_)
      this.rowNodes_.insertBefore(this.topFold_, this.rowNodes_.firstChild);

    return;
  }

  if (!this.selection.isMultiline ||
      this.selection.endRow.rowIndex >= topRowIndex) {
    // Only the startRow is above the fold.
    if (this.selection.startRow.nextSibling != this.topFold_)
      this.rowNodes_.insertBefore(this.topFold_,
                                  this.selection.startRow.nextSibling);
  } else {
    // Both rows are above the fold.
    if (this.selection.endRow.nextSibling != this.topFold_) {
      this.rowNodes_.insertBefore(this.topFold_,
                                  this.selection.endRow.nextSibling);
    }

    // Trim any intermediate lines.
    while (this.selection.startRow.nextSibling !=
           this.selection.endRow) {
      this.rowNodes_.removeChild(this.selection.startRow.nextSibling);
    }
  }

  while(this.rowNodes_.firstChild != this.selection.startRow) {
    this.rowNodes_.removeChild(this.rowNodes_.firstChild);
  }
};

/**
 * Ensure that the nodes below the bottom fold are as they should be.
 *
 * If the selection start and/or end nodes are below the visible range
 * of this hterm.ScrollPort then the dom will be adjusted so that they appear
 * after the bottom fold (the second x-fold element, aka this.bottomFold).
 *
 * If not, the bottom fold will be the last element.
 *
 * It is critical that this method does not move the selection nodes.  Doing
 * so would clear the current selection.  Instead, the rest of the DOM is
 * adjusted around them.
 */
hterm.ScrollPort.prototype.drawBottomFold_ = function(bottomRowIndex) {
  if (!this.selection.endRow ||
      this.selection.endRow.rowIndex <= bottomRowIndex) {
    // Selection is entirely above the bottom fold, just make sure the fold is
    // the last child.
    if (this.rowNodes_.lastChild != this.bottomFold_)
      this.rowNodes_.appendChild(this.bottomFold_);

    return;
  }

  if (!this.selection.isMultiline ||
      this.selection.startRow.rowIndex <= bottomRowIndex) {
    // Only the endRow is below the fold.
    if (this.bottomFold_.nextSibling != this.selection.endRow)
      this.rowNodes_.insertBefore(this.bottomFold_,
                                  this.selection.endRow);
  } else {
    // Both rows are below the fold.
    if (this.bottomFold_.nextSibling != this.selection.startRow) {
      this.rowNodes_.insertBefore(this.bottomFold_,
                                  this.selection.startRow);
    }

    // Trim any intermediate lines.
    while (this.selection.startRow.nextSibling !=
           this.selection.endRow) {
      this.rowNodes_.removeChild(this.selection.startRow.nextSibling);
    }
  }

  while(this.rowNodes_.lastChild != this.selection.endRow) {
    this.rowNodes_.removeChild(this.rowNodes_.lastChild);
  }
};

/**
 * Ensure that the rows between the top and bottom folds are as they should be.
 *
 * This method assumes that drawTopFold_() and drawBottomFold_() have already
 * run, and that they have left any visible selection row (selection start
 * or selection end) between the folds.
 *
 * It recycles DOM nodes from the previous redraw where possible, but will ask
 * the rowSource to make new nodes if necessary.
 *
 * It is critical that this method does not move the selection nodes.  Doing
 * so would clear the current selection.  Instead, the rest of the DOM is
 * adjusted around them.
 */
hterm.ScrollPort.prototype.drawVisibleRows_ = function(
    topRowIndex, bottomRowIndex) {
  var self = this;

  // Keep removing nodes, starting with currentNode, until we encounter
  // targetNode.  Throws on failure.
  function removeUntilNode(currentNode, targetNode) {
    while (currentNode != targetNode) {
      if (!currentNode)
        throw 'Did not encounter target node';

      if (currentNode == self.bottomFold_)
        throw 'Encountered bottom fold before target node';

      var deadNode = currentNode;
      currentNode = currentNode.nextSibling;
      deadNode.parentNode.removeChild(deadNode);
    }
  }

  // Shorthand for things we're going to use a lot.
  var selectionStartRow = this.selection.startRow;
  var selectionEndRow = this.selection.endRow;
  var bottomFold = this.bottomFold_;

  // The node we're examining during the current iteration.
  var node = this.topFold_.nextSibling;

  var targetDrawCount = Math.min(this.visibleRowCount,
                                 this.rowProvider_.getRowCount());

  for (var drawCount = 0; drawCount < targetDrawCount; drawCount++) {
    var rowIndex = topRowIndex + drawCount;

    if (node == bottomFold) {
      // We've hit the bottom fold, we need to insert a new row.
      var newNode = this.fetchRowNode_(rowIndex);
      if (!newNode) {
        console.log("Couldn't fetch row index: " + rowIndex);
        break;
      }

      this.rowNodes_.insertBefore(newNode, node);
      continue;
    }

    if (node.rowIndex == rowIndex) {
      // This node is in the right place, move along.
      node = node.nextSibling;
      continue;
    }

    if (selectionStartRow && selectionStartRow.rowIndex == rowIndex) {
      // The selection start row is supposed to be here, remove nodes until
      // we find it.
      removeUntilNode(node, selectionStartRow);
      node = selectionStartRow.nextSibling;
      continue;
    }

    if (selectionEndRow && selectionEndRow.rowIndex == rowIndex) {
      // The selection end row is supposed to be here, remove nodes until
      // we find it.
      removeUntilNode(node, selectionEndRow);
      node = selectionEndRow.nextSibling;
      continue;
    }

    if (node == selectionStartRow || node == selectionEndRow) {
      // We encountered the start/end of the selection, but we don't want it
      // yet.  Insert a new row instead.
      var newNode = this.fetchRowNode_(rowIndex);
      if (!newNode) {
        console.log("Couldn't fetch row index: " + rowIndex);
        break;
      }

      this.rowNodes_.insertBefore(newNode, node);
      continue;
    }

    // There is nothing special about this node, but it's in our way.  Replace
    // it with the node that should be here.
    var newNode = this.fetchRowNode_(rowIndex);
    if (!newNode) {
      console.log("Couldn't fetch row index: " + rowIndex);
      break;
    }

    if (node == newNode) {
      node = node.nextSibling;
      continue;
    }

    this.rowNodes_.insertBefore(newNode, node);
    if (!newNode.nextSibling)
      debugger;
    this.rowNodes_.removeChild(node);
    node = newNode.nextSibling;
  }

  if (node != this.bottomFold_)
    removeUntilNode(node, bottomFold);
};

/**
 * Empty out both select bags and remove them from the document.
 *
 * These nodes hold the text between the start and end of the selection
 * when that text is otherwise off screen.  They are filled out in the
 * onCopy_ event.
 */
hterm.ScrollPort.prototype.resetSelectBags_ = function() {
  if (this.topSelectBag_.parentNode) {
    this.topSelectBag_.textContent = '';
    this.topSelectBag_.parentNode.removeChild(this.topSelectBag_);
  }

  if (this.bottomSelectBag_.parentNode) {
    this.bottomSelectBag_.textContent = '';
    this.bottomSelectBag_.parentNode.removeChild(this.bottomSelectBag_);
  }
};

/**
 * Place a row node in the cache of visible nodes.
 *
 * This method may only be used during a redraw_.
 */
hterm.ScrollPort.prototype.cacheRowNode_ = function(rowNode) {
  this.currentRowNodeCache_[rowNode.rowIndex] = rowNode;
};

/**
 * Fetch the row node for the given index.
 *
 * This will return a node from the cache if possible, or will request one
 * from the RowProvider if not.
 *
 * If a redraw_ is in progress the row will be added to the current cache.
 */
hterm.ScrollPort.prototype.fetchRowNode_ = function(rowIndex) {
  var node;

  if (this.previousRowNodeCache_ && rowIndex in this.previousRowNodeCache_) {
    node = this.previousRowNodeCache_[rowIndex];
  } else {
    node = this.rowProvider_.getRowNode(rowIndex);
  }

  if (this.currentRowNodeCache_)
    this.cacheRowNode_(node);

  return node;
};

/**
 * Select all rows in the viewport.
 */
hterm.ScrollPort.prototype.selectAll = function() {
  var firstRow;

  if (this.topFold_.nextSibling.rowIndex != 0) {
    while (this.topFold_.previousSibling) {
      this.rowNodes_.removeChild(this.topFold_.previousSibling);
    }

    firstRow = this.fetchRowNode_(0);
    this.rowNodes_.insertBefore(firstRow, this.topFold_);
    this.syncRowNodesDimensions_();
  } else {
    firstRow = this.topFold_.nextSibling;
  }

  var lastRowIndex = this.rowProvider_.getRowCount() - 1;
  var lastRow;

  if (this.bottomFold_.previousSibling.rowIndex != lastRowIndex) {
    while (this.bottomFold_.nextSibling) {
      this.rowNodes_.removeChild(this.bottomFold_.nextSibling);
    }

    lastRow = this.fetchRowNode_(lastRowIndex);
    this.rowNodes_.appendChild(lastRow);
  } else {
    lastRow = this.bottomFold_.previousSibling.rowIndex;
  }

  var selection = this.document_.getSelection();
  selection.collapse(firstRow, 0);
  selection.extend(lastRow, lastRow.childNodes.length);

  this.selection.sync();
};

/**
 * Return the maximum scroll position in pixels.
 */
hterm.ScrollPort.prototype.getScrollMax_ = function(e) {
  return (hterm.getClientHeight(this.scrollArea_) +
          this.visibleRowTopMargin + this.visibleRowBottomMargin -
          hterm.getClientHeight(this.screen_));
};

/**
 * Scroll the given rowIndex to the top of the hterm.ScrollPort.
 *
 * @param {integer} rowIndex Index of the target row.
 */
hterm.ScrollPort.prototype.scrollRowToTop = function(rowIndex) {
  this.syncScrollHeight();

  this.isScrolledEnd = (
    rowIndex + this.visibleRowCount >= this.lastRowCount_);

  var scrollTop = rowIndex * this.characterSize.height +
      this.visibleRowTopMargin;

  var scrollMax = this.getScrollMax_();
  if (scrollTop > scrollMax)
    scrollTop = scrollMax;

  if (this.screen_.scrollTop == scrollTop)
    return;

  this.screen_.scrollTop = scrollTop;
  this.scheduleRedraw();
};

/**
 * Scroll the given rowIndex to the bottom of the hterm.ScrollPort.
 *
 * @param {integer} rowIndex Index of the target row.
 */
hterm.ScrollPort.prototype.scrollRowToBottom = function(rowIndex) {
  this.syncScrollHeight();

  this.isScrolledEnd = (
    rowIndex + this.visibleRowCount >= this.lastRowCount_);

  var scrollTop = rowIndex * this.characterSize.height +
      this.visibleRowTopMargin + this.visibleRowBottomMargin;
  scrollTop -= this.visibleRowCount * this.characterSize.height;

  if (scrollTop < 0)
    scrollTop = 0;

  if (this.screen_.scrollTop == scrollTop)
    return;

  this.screen_.scrollTop = scrollTop;
};

/**
 * Return the row index of the first visible row.
 *
 * This is based on the scroll position.  If a redraw_ is in progress this
 * returns the row that *should* be at the top.
 */
hterm.ScrollPort.prototype.getTopRowIndex = function() {
  return Math.floor(this.screen_.scrollTop / this.characterSize.height);
};

/**
 * Return the row index of the last visible row.
 *
 * This is based on the scroll position.  If a redraw_ is in progress this
 * returns the row that *should* be at the bottom.
 */
hterm.ScrollPort.prototype.getBottomRowIndex = function(topRowIndex) {
  return topRowIndex + this.visibleRowCount - 1;
};

/**
 * Handler for scroll events.
 *
 * The onScroll event fires when scrollArea's scrollTop property changes.  This
 * may be due to the user manually move the scrollbar, or a programmatic change.
 */
hterm.ScrollPort.prototype.onScroll_ = function(e) {
  var screenSize = this.getScreenSize();
  if (screenSize.width != this.lastScreenWidth_ ||
      screenSize.height != this.lastScreenHeight_) {
    // This event may also fire during a resize (but before the resize event!).
    // This happens when the browser moves the scrollbar as part of the resize.
    // In these cases, we want to ignore the scroll event and let onResize
    // handle things.  If we don't, then we end up scrolling to the wrong
    // position after a resize.
    this.resize();
    return;
  }

  this.redraw_();
  this.publish('scroll', { scrollPort: this });
};

/**
 * Clients can override this if they want to hear scrollwheel events.
 *
 * Clients may call event.preventDefault() if they want to keep the scrollport
 * from also handling the events.
 */
hterm.ScrollPort.prototype.onScrollWheel = function(e) {};

/**
 * Handler for scroll-wheel events.
 *
 * The onScrollWheel event fires when the user moves their scrollwheel over this
 * hterm.ScrollPort.  Because the frontmost element in the hterm.ScrollPort is
 * a fixed position DIV, the scroll wheel does nothing by default.  Instead, we
 * have to handle it manually.
 */
hterm.ScrollPort.prototype.onScrollWheel_ = function(e) {
  this.onScrollWheel(e);

  if (e.defaultPrevented)
    return;

  var top = this.screen_.scrollTop - e.wheelDeltaY;
  if (top < 0)
    top = 0;

  var scrollMax = this.getScrollMax_();
  if (top > scrollMax)
    top = scrollMax;

  if (top != this.screen_.scrollTop) {
    // Moving scrollTop causes a scroll event, which triggers the redraw.
    this.screen_.scrollTop = top;

    // Only preventDefault when we've actually scrolled.  If there's nothing
    // to scroll we want to pass the event through so Chrome can detect the
    // overscroll.
    e.preventDefault();
  }
};

/**
 * Handler for resize events.
 *
 * The browser will resize us such that the top row stays at the top, but we
 * prefer to the bottom row to stay at the bottom.
 */
hterm.ScrollPort.prototype.onResize_ = function(e) {
  // Re-measure, since onResize also happens for browser zoom changes.
  this.syncCharacterSize();
  this.resize();
};

/**
 * Clients can override this if they want to hear copy events.
 *
 * Clients may call event.preventDefault() if they want to keep the scrollport
 * from also handling the events.
 */
hterm.ScrollPort.prototype.onCopy = function(e) { };

/**
 * Handler for copy-to-clipboard events.
 *
 * If some or all of the selected rows are off screen we may need to fill in
 * the rows between selection start and selection end.  This handler determines
 * if we're missing some of the selected text, and if so populates one or both
 * of the "select bags" with the missing text.
 */
hterm.ScrollPort.prototype.onCopy_ = function(e) {
  this.onCopy(e);

  if (e.defaultPrevented)
    return;

  this.resetSelectBags_();
  this.selection.sync();

  if (!this.selection.startRow ||
      this.selection.endRow.rowIndex - this.selection.startRow.rowIndex < 2) {
    return;
  }

  var topRowIndex = this.getTopRowIndex();
  var bottomRowIndex = this.getBottomRowIndex(topRowIndex);

  if (this.selection.startRow.rowIndex < topRowIndex) {
    // Start of selection is above the top fold.
    var endBackfillIndex;

    if (this.selection.endRow.rowIndex < topRowIndex) {
      // Entire selection is above the top fold.
      endBackfillIndex = this.selection.endRow.rowIndex;
    } else {
      // Selection extends below the top fold.
      endBackfillIndex = this.topFold_.nextSibling.rowIndex;
    }

    this.topSelectBag_.textContent = this.rowProvider_.getRowsText(
        this.selection.startRow.rowIndex + 1, endBackfillIndex);
    this.rowNodes_.insertBefore(this.topSelectBag_,
                                this.selection.startRow.nextSibling);
    this.syncRowNodesDimensions_();
  }

  if (this.selection.endRow.rowIndex > bottomRowIndex) {
    // Selection ends below the bottom fold.
    var startBackfillIndex;

    if (this.selection.startRow.rowIndex > bottomRowIndex) {
      // Entire selection is below the bottom fold.
      startBackfillIndex = this.selection.startRow.rowIndex + 1;
    } else {
      // Selection starts above the bottom fold.
      startBackfillIndex = this.bottomFold_.previousSibling.rowIndex + 1;
    }

    this.bottomSelectBag_.textContent = this.rowProvider_.getRowsText(
        startBackfillIndex, this.selection.endRow.rowIndex);
    this.rowNodes_.insertBefore(this.bottomSelectBag_, this.selection.endRow);
  }
};

/**
 * Handle a paste event on the the ScrollPort's screen element.
 */
hterm.ScrollPort.prototype.onPaste_ = function(e) {
  this.pasteTarget_.focus();

  var self = this;
  setTimeout(function() {
      self.publish('paste', { text: self.pasteTarget_.value });
      self.pasteTarget_.value = '';
      self.screen_.focus();
    }, 0);
};

/**
 * Set the vertical scrollbar mode of the ScrollPort.
 */
hterm.ScrollPort.prototype.setScrollbarVisible = function(state) {
  this.screen_.style.overflowY = state ? 'scroll' : 'hidden';
};
// SOURCE FILE: hterm/js/hterm_terminal.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.colors', 'lib.PreferenceManager', 'lib.resource',
          'hterm.Keyboard', 'hterm.Options', 'hterm.PreferenceManager',
          'hterm.Screen', 'hterm.ScrollPort', 'hterm.Size',
          'hterm.TextAttributes', 'hterm.VT');

/**
 * Constructor for the Terminal class.
 *
 * A Terminal pulls together the hterm.ScrollPort, hterm.Screen and hterm.VT100
 * classes to provide the complete terminal functionality.
 *
 * There are a number of lower-level Terminal methods that can be called
 * directly to manipulate the cursor, text, scroll region, and other terminal
 * attributes.  However, the primary method is interpret(), which parses VT
 * escape sequences and invokes the appropriate Terminal methods.
 *
 * This class was heavily influenced by Cory Maccarrone's Framebuffer class.
 *
 * TODO(rginda): Eventually we're going to need to support characters which are
 * displayed twice as wide as standard latin characters.  This is to support
 * CJK (and possibly other character sets).
 *
 * @param {string} opt_profileId Optional preference profile name.  If not
 *     provided, defaults to 'default'.
 */
hterm.Terminal = function(opt_profileId) {
  this.profileId_ = null;

  // Two screen instances.
  this.primaryScreen_ = new hterm.Screen();
  this.alternateScreen_ = new hterm.Screen();

  // The "current" screen.
  this.screen_ = this.primaryScreen_;

  // The local notion of the screen size.  ScreenBuffers also have a size which
  // indicates their present size.  During size changes, the two may disagree.
  // Also, the inactive screen's size is not altered until it is made the active
  // screen.
  this.screenSize = new hterm.Size(0, 0);

  // The scroll port we'll be using to display the visible rows.
  this.scrollPort_ = new hterm.ScrollPort(this);
  this.scrollPort_.subscribe('resize', this.onResize_.bind(this));
  this.scrollPort_.subscribe('scroll', this.onScroll_.bind(this));
  this.scrollPort_.subscribe('paste', this.onPaste_.bind(this));
  this.scrollPort_.onCopy = this.onCopy_.bind(this);

  // The div that contains this terminal.
  this.div_ = null;

  // The document that contains the scrollPort.  Defaulted to the global
  // document here so that the terminal is functional even if it hasn't been
  // inserted into a document yet, but re-set in decorate().
  this.document_ = window.document;

  // The rows that have scrolled off screen and are no longer addressable.
  this.scrollbackRows_ = [];

  // Saved tab stops.
  this.tabStops_ = [];

  // Keep track of whether default tab stops have been erased; after a TBC
  // clears all tab stops, defaults aren't restored on resize until a reset.
  this.defaultTabStops = true;

  // The VT's notion of the top and bottom rows.  Used during some VT
  // cursor positioning and scrolling commands.
  this.vtScrollTop_ = null;
  this.vtScrollBottom_ = null;

  // The DIV element for the visible cursor.
  this.cursorNode_ = null;

  // The current cursor shape of the terminal.
  this.cursorShape_ = hterm.Terminal.cursorShape.BLOCK;

  // The current color of the cursor.
  this.cursorColor_ = null;

  // These prefs are cached so we don't have to read from local storage with
  // each output and keystroke.  They are initialized by the preference manager.
  this.backgroundColor_ = null;
  this.foregroundColor_ = null;
  this.scrollOnOutput_ = null;
  this.scrollOnKeystroke_ = null;

  // True if we should send mouse events to the vt, false if we want them
  // to manage the local text selection.
  this.reportMouseEvents_ = false;

  // Terminal bell sound.
  this.bellAudio_ = this.document_.createElement('audio');
  this.bellAudio_.setAttribute('preload', 'auto');

  // Cursor position and attributes saved with DECSC.
  this.savedOptions_ = {};

  // The current mode bits for the terminal.
  this.options_ = new hterm.Options();

  // Timeouts we might need to clear.
  this.timeouts_ = {};

  // The VT escape sequence interpreter.
  this.vt = new hterm.VT(this);

  // The keyboard hander.
  this.keyboard = new hterm.Keyboard(this);

  // General IO interface that can be given to third parties without exposing
  // the entire terminal object.
  this.io = new hterm.Terminal.IO(this);

  // True if mouse-click-drag should scroll the terminal.
  this.enableMouseDragScroll = true;

  this.copyOnSelect = null;
  this.mousePasteButton = null;

  this.realizeSize_(80, 24);
  this.setDefaultTabStops();

  this.setProfile(opt_profileId || 'default',
                  function() { this.onTerminalReady() }.bind(this));
};

/**
 * Possible cursor shapes.
 */
hterm.Terminal.cursorShape = {
  BLOCK: 'BLOCK',
  BEAM: 'BEAM',
  UNDERLINE: 'UNDERLINE'
};

/**
 * Clients should override this to be notified when the terminal is ready
 * for use.
 *
 * The terminal initialization is asynchronous, and shouldn't be used before
 * this method is called.
 */
hterm.Terminal.prototype.onTerminalReady = function() { };

/**
 * Default tab with of 8 to match xterm.
 */
hterm.Terminal.prototype.tabWidth = 8;

/**
 * Select a preference profile.
 *
 * This will load the terminal preferences for the given profile name and
 * associate subsequent preference changes with the new preference profile.
 *
 * @param {string} newName The name of the preference profile.  Forward slash
 *     characters will be removed from the name.
 * @param {function} opt_callback Optional callback to invoke when the profile
 *     transition is complete.
 */
hterm.Terminal.prototype.setProfile = function(profileId, opt_callback) {
  this.profileId_ = profileId.replace(/\//g, '');

  var terminal = this;

  if (this.prefs_)
    this.prefs_.deactivate();

  this.prefs_ = new hterm.PreferenceManager(this.profileId_);
  this.prefs_.addObservers(null, {
    'alt-backspace-is-meta-backspace': function(v) {
      terminal.keyboard.altBackspaceIsMetaBackspace = v;
    },

    'alt-is-meta': function(v) {
      terminal.keyboard.altIsMeta = v;
    },

    'alt-sends-what': function(v) {
      if (!/^(escape|8-bit|browser-key)$/.test(v))
        v = 'escape';

      terminal.keyboard.altSendsWhat = v;
    },

    'audible-bell-sound': function(v) {
      var ary = v.match(/^lib-resource:(\S+)/);
      if (ary) {
        terminal.bellAudio_.setAttribute('src',
                                         lib.resource.getDataUrl(ary[1]));
      } else {
        terminal.bellAudio_.setAttribute('src', v);
      }
    },

    'background-color': function(v) {
      terminal.setBackgroundColor(v);
    },

    'background-image': function(v) {
      terminal.scrollPort_.setBackgroundImage(v);
    },

    'background-size': function(v) {
      terminal.scrollPort_.setBackgroundSize(v);
    },

    'background-position': function(v) {
      terminal.scrollPort_.setBackgroundPosition(v);
    },

    'backspace-sends-backspace': function(v) {
      terminal.keyboard.backspaceSendsBackspace = v;
    },

    'cursor-blink': function(v) {
      terminal.setCursorBlink(!!v);
    },

    'cursor-color': function(v) {
      terminal.setCursorColor(v);
    },

    'color-palette-overrides': function(v) {
      if (!(v == null || v instanceof Object || v instanceof Array)) {
        console.warn('Preference color-palette-overrides is not an array or ' +
                     'object: ' + v);
        return;
      }

      lib.colors.colorPalette = lib.colors.stockColorPalette.concat();

      if (v) {
        for (var key in v) {
          var i = parseInt(key);
          if (isNaN(i) || i < 0 || i > 255) {
            console.log('Invalid value in palette: ' + key + ': ' + v[key]);
            continue;
          }

          if (v[i]) {
            var rgb = lib.colors.normalizeCSS(v[i]);
            if (rgb)
              lib.colors.colorPalette[i] = rgb;
          }
        }
      }

      terminal.primaryScreen_.textAttributes.resetColorPalette()
      terminal.alternateScreen_.textAttributes.resetColorPalette();
    },

    'copy-on-select': function(v) {
      terminal.copyOnSelect = !!v;
    },

    'ctrl-plus-minus-zero-zoom': function(v) {
      terminal.keyboard.ctrlPlusMinusZeroZoom = v;
    },

    'ctrl-v-paste': function(v) {
      terminal.keyboard.ctrlVPaste = v;
    },

    'enable-8-bit-control': function(v) {
      terminal.vt.enable8BitControl = !!v;
    },

    'enable-bold': function(v) {
      terminal.syncBoldSafeState();
    },

    'enable-bold-as-bright': function(v) {
      terminal.primaryScreen_.textAttributes.enableBoldAsBright = !!v;
      terminal.alternateScreen_.textAttributes.enableBoldAsBright = !!v;
    },

    'enable-clipboard-write': function(v) {
      terminal.vt.enableClipboardWrite = !!v;
    },

    'enable-dec12': function(v) {
      terminal.vt.enableDec12 = !!v;
    },

    'font-family': function(v) {
      terminal.syncFontFamily();
    },

    'font-size': function(v) {
      terminal.setFontSize(v);
    },

    'font-smoothing': function(v) {
      terminal.syncFontFamily();
    },

    'foreground-color': function(v) {
      terminal.setForegroundColor(v);
    },

    'home-keys-scroll': function(v) {
      terminal.keyboard.homeKeysScroll = v;
    },

    'max-string-sequence': function(v) {
      terminal.vt.maxStringSequence = v;
    },

    'media-keys-are-fkeys': function(v) {
      terminal.keyboard.mediaKeysAreFKeys = v;
    },

    'meta-sends-escape': function(v) {
      terminal.keyboard.metaSendsEscape = v;
    },

    'mouse-paste-button': function(v) {
      terminal.syncMousePasteButton();
    },

    'page-keys-scroll': function(v) {
      terminal.keyboard.pageKeysScroll = v;
    },

    'pass-alt-number': function(v) {
      if (v == null) {
        var osx = window.navigator.userAgent.match(/Mac OS X/);

        // Let Alt-1..9 pass to the browser (to control tab switching) on
        // non-OS X systems, or if hterm is not opened in an app window.
        v = (!osx && hterm.windowType != 'popup');
      }

      terminal.passAltNumber = v;
    },

    'pass-ctrl-number': function(v) {
      if (v == null) {
        var osx = window.navigator.userAgent.match(/Mac OS X/);

        // Let Ctrl-1..9 pass to the browser (to control tab switching) on
        // non-OS X systems, or if hterm is not opened in an app window.
        v = (!osx && hterm.windowType != 'popup');
      }

      terminal.passCtrlNumber = v;
    },

    'pass-meta-number': function(v) {
      if (v == null) {
        var osx = window.navigator.userAgent.match(/Mac OS X/);

        // Let Meta-1..9 pass to the browser (to control tab switching) on
        // OS X systems, or if hterm is not opened in an app window.
        v = (osx && hterm.windowType != 'popup');
      }

      terminal.passMetaNumber = v;
    },

    'receive-encoding': function(v) {
       if (!(/^(utf-8|raw)$/).test(v)) {
         console.warn('Invalid value for "receive-encoding": ' + v);
         v = 'utf-8';
       }

       terminal.vt.characterEncoding = v;
    },

    'scroll-on-keystroke': function(v) {
      terminal.scrollOnKeystroke_ = v;
    },

    'scroll-on-output': function(v) {
      terminal.scrollOnOutput_ = v;
    },

    'scrollbar-visible': function(v) {
      terminal.setScrollbarVisible(v);
    },

    'send-encoding': function(v) {
       if (!(/^(utf-8|raw)$/).test(v)) {
         console.warn('Invalid value for "send-encoding": ' + v);
         v = 'utf-8';
       }

       terminal.keyboard.characterEncoding = v;
    },

    'shift-insert-paste': function(v) {
      terminal.keyboard.shiftInsertPaste = v;
    },

    'user-css': function(v) {
      terminal.scrollPort_.setUserCss(v);
    }
  });

  this.prefs_.readStorage(function() {
    this.prefs_.notifyAll();

    if (opt_callback)
      opt_callback();
  }.bind(this));
};

/**
 * Set the color for the cursor.
 *
 * If you want this setting to persist, set it through prefs_, rather than
 * with this method.
 */
hterm.Terminal.prototype.setCursorColor = function(color) {
  this.cursorColor_ = color;
  this.cursorNode_.style.backgroundColor = color;
  this.cursorNode_.style.borderColor = color;
};

/**
 * Return the current cursor color as a string.
 */
hterm.Terminal.prototype.getCursorColor = function() {
  return this.cursorColor_;
};

/**
 * Enable or disable mouse based text selection in the terminal.
 */
hterm.Terminal.prototype.setSelectionEnabled = function(state) {
  this.enableMouseDragScroll = state;
};

/**
 * Set the background color.
 *
 * If you want this setting to persist, set it through prefs_, rather than
 * with this method.
 */
hterm.Terminal.prototype.setBackgroundColor = function(color) {
  this.backgroundColor_ = lib.colors.normalizeCSS(color);
  this.primaryScreen_.textAttributes.setDefaults(
      this.foregroundColor_, this.backgroundColor_);
  this.alternateScreen_.textAttributes.setDefaults(
      this.foregroundColor_, this.backgroundColor_);
  this.scrollPort_.setBackgroundColor(color);
};

/**
 * Return the current terminal background color.
 *
 * Intended for use by other classes, so we don't have to expose the entire
 * prefs_ object.
 */
hterm.Terminal.prototype.getBackgroundColor = function() {
  return this.backgroundColor_;
};

/**
 * Set the foreground color.
 *
 * If you want this setting to persist, set it through prefs_, rather than
 * with this method.
 */
hterm.Terminal.prototype.setForegroundColor = function(color) {
  this.foregroundColor_ = lib.colors.normalizeCSS(color);
  this.primaryScreen_.textAttributes.setDefaults(
      this.foregroundColor_, this.backgroundColor_);
  this.alternateScreen_.textAttributes.setDefaults(
      this.foregroundColor_, this.backgroundColor_);
  this.scrollPort_.setForegroundColor(color);
};

/**
 * Return the current terminal foreground color.
 *
 * Intended for use by other classes, so we don't have to expose the entire
 * prefs_ object.
 */
hterm.Terminal.prototype.getForegroundColor = function() {
  return this.foregroundColor_;
};

/**
 * Create a new instance of a terminal command and run it with a given
 * argument string.
 *
 * @param {function} commandClass The constructor for a terminal command.
 * @param {string} argString The argument string to pass to the command.
 */
hterm.Terminal.prototype.runCommandClass = function(commandClass, argString) {
  var environment = this.prefs_.get('environment');
  if (typeof environment != 'object' || environment == null)
    environment = {};

  var self = this;
  this.command = new commandClass(
      { argString: argString || '',
        io: this.io.push(),
        environment: environment,
        onExit: function(code) {
          self.io.pop();
          self.uninstallKeyboard();
          if (self.prefs_.get('close-on-exit'))
              window.close();
        }
      });

  this.installKeyboard();
  this.command.run();
};

/**
 * Returns true if the current screen is the primary screen, false otherwise.
 */
hterm.Terminal.prototype.isPrimaryScreen = function() {
  return this.screen_ == this.primaryScreen_;
};

/**
 * Install the keyboard handler for this terminal.
 *
 * This will prevent the browser from seeing any keystrokes sent to the
 * terminal.
 */
hterm.Terminal.prototype.installKeyboard = function() {
  this.keyboard.installKeyboard(this.scrollPort_.getScreenNode());
}

/**
 * Uninstall the keyboard handler for this terminal.
 */
hterm.Terminal.prototype.uninstallKeyboard = function() {
  this.keyboard.installKeyboard(null);
}

/**
 * Set the font size for this terminal.
 *
 * Call setFontSize(0) to reset to the default font size.
 *
 * This function does not modify the font-size preference.
 *
 * @param {number} px The desired font size, in pixels.
 */
hterm.Terminal.prototype.setFontSize = function(px) {
  if (px === 0)
    px = this.prefs_.get('font-size');

  this.scrollPort_.setFontSize(px);
  if (this.wcCssRule_) {
    this.wcCssRule_.style.width = this.scrollPort_.characterSize.width * 2 +
        'px';
  }
};

/**
 * Get the current font size.
 */
hterm.Terminal.prototype.getFontSize = function() {
  return this.scrollPort_.getFontSize();
};

/**
 * Get the current font family.
 */
hterm.Terminal.prototype.getFontFamily = function() {
  return this.scrollPort_.getFontFamily();
};

/**
 * Set the CSS "font-family" for this terminal.
 */
hterm.Terminal.prototype.syncFontFamily = function() {
  this.scrollPort_.setFontFamily(this.prefs_.get('font-family'),
                                 this.prefs_.get('font-smoothing'));
  this.syncBoldSafeState();
};

/**
 * Set this.mousePasteButton based on the mouse-paste-button pref,
 * autodetecting if necessary.
 */
hterm.Terminal.prototype.syncMousePasteButton = function() {
  var button = this.prefs_.get('mouse-paste-button');
  if (typeof button == 'number') {
    this.mousePasteButton = button;
    return;
  }

  var ary = navigator.userAgent.match(/\(X11;\s+(\S+)/);
  if (!ary || ary[2] == 'CrOS') {
    this.mousePasteButton = 2;
  } else {
    this.mousePasteButton = 3;
  }
};

/**
 * Enable or disable bold based on the enable-bold pref, autodetecting if
 * necessary.
 */
hterm.Terminal.prototype.syncBoldSafeState = function() {
  var enableBold = this.prefs_.get('enable-bold');
  if (enableBold !== null) {
    this.primaryScreen_.textAttributes.enableBold = enableBold;
    this.alternateScreen_.textAttributes.enableBold = enableBold;
    return;
  }

  var normalSize = this.scrollPort_.measureCharacterSize();
  var boldSize = this.scrollPort_.measureCharacterSize('bold');

  var isBoldSafe = normalSize.equals(boldSize);
  if (!isBoldSafe) {
    console.warn('Bold characters disabled: Size of bold weight differs ' +
                 'from normal.  Font family is: ' +
                 this.scrollPort_.getFontFamily());
  }

  this.primaryScreen_.textAttributes.enableBold = isBoldSafe;
  this.alternateScreen_.textAttributes.enableBold = isBoldSafe;
};

/**
 * Return a copy of the current cursor position.
 *
 * @return {hterm.RowCol} The RowCol object representing the current position.
 */
hterm.Terminal.prototype.saveCursor = function() {
  return this.screen_.cursorPosition.clone();
};

hterm.Terminal.prototype.getTextAttributes = function() {
  return this.screen_.textAttributes;
};

hterm.Terminal.prototype.setTextAttributes = function(textAttributes) {
  this.screen_.textAttributes = textAttributes;
};

/**
 * Return the current browser zoom factor applied to the terminal.
 *
 * @return {number} The current browser zoom factor.
 */
hterm.Terminal.prototype.getZoomFactor = function() {
  return this.scrollPort_.characterSize.zoomFactor;
};

/**
 * Change the title of this terminal's window.
 */
hterm.Terminal.prototype.setWindowTitle = function(title) {
  window.document.title = title;
};

/**
 * Restore a previously saved cursor position.
 *
 * @param {hterm.RowCol} cursor The position to restore.
 */
hterm.Terminal.prototype.restoreCursor = function(cursor) {
  var row = lib.f.clamp(cursor.row, 0, this.screenSize.height - 1);
  var column = lib.f.clamp(cursor.column, 0, this.screenSize.width - 1);
  this.screen_.setCursorPosition(row, column);
  if (cursor.column > column ||
      cursor.column == column && cursor.overflow) {
    this.screen_.cursorPosition.overflow = true;
  }
};

/**
 * Clear the cursor's overflow flag.
 */
hterm.Terminal.prototype.clearCursorOverflow = function() {
  this.screen_.cursorPosition.overflow = false;
};

/**
 * Sets the cursor shape
 */
hterm.Terminal.prototype.setCursorShape = function(shape) {
  this.cursorShape_ = shape;
  this.restyleCursor_();
}

/**
 * Get the cursor shape
 */
hterm.Terminal.prototype.getCursorShape = function() {
  return this.cursorShape_;
}

/**
 * Set the width of the terminal, resizing the UI to match.
 */
hterm.Terminal.prototype.setWidth = function(columnCount) {
  if (columnCount == null) {
    this.div_.style.width = '100%';
    return;
  }

  this.div_.style.width = this.scrollPort_.characterSize.width *
      columnCount + this.scrollPort_.currentScrollbarWidthPx + 'px';
  this.realizeSize_(columnCount, this.screenSize.height);
  this.scheduleSyncCursorPosition_();
};

/**
 * Set the height of the terminal, resizing the UI to match.
 */
hterm.Terminal.prototype.setHeight = function(rowCount) {
  if (rowCount == null) {
    this.div_.style.height = '100%';
    return;
  }

  this.div_.style.height =
      this.scrollPort_.characterSize.height * rowCount + 'px';
  this.realizeSize_(this.screenSize.width, rowCount);
  this.scheduleSyncCursorPosition_();
};

/**
 * Deal with terminal size changes.
 *
 */
hterm.Terminal.prototype.realizeSize_ = function(columnCount, rowCount) {
  if (columnCount != this.screenSize.width)
    this.realizeWidth_(columnCount);

  if (rowCount != this.screenSize.height)
    this.realizeHeight_(rowCount);

  // Send new terminal size to plugin.
  this.io.onTerminalResize_(columnCount, rowCount);
};

/**
 * Deal with terminal width changes.
 *
 * This function does what needs to be done when the terminal width changes
 * out from under us.  It happens here rather than in onResize_() because this
 * code may need to run synchronously to handle programmatic changes of
 * terminal width.
 *
 * Relying on the browser to send us an async resize event means we may not be
 * in the correct state yet when the next escape sequence hits.
 */
hterm.Terminal.prototype.realizeWidth_ = function(columnCount) {
  if (columnCount <= 0)
    throw new Error('Attempt to realize bad width: ' + columnCount);

  var deltaColumns = columnCount - this.screen_.getWidth();

  this.screenSize.width = columnCount;
  this.screen_.setColumnCount(columnCount);

  if (deltaColumns > 0) {
    if (this.defaultTabStops)
      this.setDefaultTabStops(this.screenSize.width - deltaColumns);
  } else {
    for (var i = this.tabStops_.length - 1; i >= 0; i--) {
      if (this.tabStops_[i] < columnCount)
        break;

      this.tabStops_.pop();
    }
  }

  this.screen_.setColumnCount(this.screenSize.width);
};

/**
 * Deal with terminal height changes.
 *
 * This function does what needs to be done when the terminal height changes
 * out from under us.  It happens here rather than in onResize_() because this
 * code may need to run synchronously to handle programmatic changes of
 * terminal height.
 *
 * Relying on the browser to send us an async resize event means we may not be
 * in the correct state yet when the next escape sequence hits.
 */
hterm.Terminal.prototype.realizeHeight_ = function(rowCount) {
  if (rowCount <= 0)
    throw new Error('Attempt to realize bad height: ' + rowCount);

  var deltaRows = rowCount - this.screen_.getHeight();

  this.screenSize.height = rowCount;

  var cursor = this.saveCursor();

  if (deltaRows < 0) {
    // Screen got smaller.
    deltaRows *= -1;
    while (deltaRows) {
      var lastRow = this.getRowCount() - 1;
      if (lastRow - this.scrollbackRows_.length == cursor.row)
        break;

      if (this.getRowText(lastRow))
        break;

      this.screen_.popRow();
      deltaRows--;
    }

    var ary = this.screen_.shiftRows(deltaRows);
    this.scrollbackRows_.push.apply(this.scrollbackRows_, ary);

    // We just removed rows from the top of the screen, we need to update
    // the cursor to match.
    cursor.row = Math.max(cursor.row - deltaRows, 0);
  } else if (deltaRows > 0) {
    // Screen got larger.

    if (deltaRows <= this.scrollbackRows_.length) {
      var scrollbackCount = Math.min(deltaRows, this.scrollbackRows_.length);
      var rows = this.scrollbackRows_.splice(
          this.scrollbackRows_.length - scrollbackCount, scrollbackCount);
      this.screen_.unshiftRows(rows);
      deltaRows -= scrollbackCount;
      cursor.row += scrollbackCount;
    }

    if (deltaRows)
      this.appendRows_(deltaRows);
  }

  this.setVTScrollRegion(null, null);
  this.restoreCursor(cursor);
};

/**
 * Scroll the terminal to the top of the scrollback buffer.
 */
hterm.Terminal.prototype.scrollHome = function() {
  this.scrollPort_.scrollRowToTop(0);
};

/**
 * Scroll the terminal to the end.
 */
hterm.Terminal.prototype.scrollEnd = function() {
  this.scrollPort_.scrollRowToBottom(this.getRowCount());
};

/**
 * Scroll the terminal one page up (minus one line) relative to the current
 * position.
 */
hterm.Terminal.prototype.scrollPageUp = function() {
  var i = this.scrollPort_.getTopRowIndex();
  this.scrollPort_.scrollRowToTop(i - this.screenSize.height + 1);
};

/**
 * Scroll the terminal one page down (minus one line) relative to the current
 * position.
 */
hterm.Terminal.prototype.scrollPageDown = function() {
  var i = this.scrollPort_.getTopRowIndex();
  this.scrollPort_.scrollRowToTop(i + this.screenSize.height - 1);
};

/**
 * Clear primary screen, secondary screen, and the scrollback buffer.
 */
hterm.Terminal.prototype.wipeContents = function() {
  this.scrollbackRows_.length = 0;
  this.scrollPort_.resetCache();

  [this.primaryScreen_, this.alternateScreen_].forEach(function(screen) {
    var bottom = screen.getHeight();
    if (bottom > 0) {
      this.renumberRows_(0, bottom);
      this.clearHome(screen);
    }
  }.bind(this));

  this.syncCursorPosition_();
  this.scrollPort_.invalidate();
};

/**
 * Full terminal reset.
 */
hterm.Terminal.prototype.reset = function() {
  this.clearAllTabStops();
  this.setDefaultTabStops();

  this.clearHome(this.primaryScreen_);
  this.primaryScreen_.textAttributes.reset();

  this.clearHome(this.alternateScreen_);
  this.alternateScreen_.textAttributes.reset();

  this.setCursorBlink(!!this.prefs_.get('cursor-blink'));

  this.vt.reset();

  this.softReset();
};

/**
 * Soft terminal reset.
 *
 * Perform a soft reset to the default values listed in
 * http://www.vt100.net/docs/vt510-rm/DECSTR#T5-9
 */
hterm.Terminal.prototype.softReset = function() {
  // Reset terminal options to their default values.
  this.options_ = new hterm.Options();

  // Xterm also resets the color palette on soft reset, even though it doesn't
  // seem to be documented anywhere.
  this.primaryScreen_.textAttributes.resetColorPalette();
  this.alternateScreen_.textAttributes.resetColorPalette();

  // The xterm man page explicitly says this will happen on soft reset.
  this.setVTScrollRegion(null, null);

  // Xterm also shows the cursor on soft reset, but does not alter the blink
  // state.
  this.setCursorVisible(true);
};

/**
 * Move the cursor forward to the next tab stop, or to the last column
 * if no more tab stops are set.
 */
hterm.Terminal.prototype.forwardTabStop = function() {
  var column = this.screen_.cursorPosition.column;

  for (var i = 0; i < this.tabStops_.length; i++) {
    if (this.tabStops_[i] > column) {
      this.setCursorColumn(this.tabStops_[i]);
      return;
    }
  }

  // xterm does not clear the overflow flag on HT or CHT.
  var overflow = this.screen_.cursorPosition.overflow;
  this.setCursorColumn(this.screenSize.width - 1);
  this.screen_.cursorPosition.overflow = overflow;
};

/**
 * Move the cursor backward to the previous tab stop, or to the first column
 * if no previous tab stops are set.
 */
hterm.Terminal.prototype.backwardTabStop = function() {
  var column = this.screen_.cursorPosition.column;

  for (var i = this.tabStops_.length - 1; i >= 0; i--) {
    if (this.tabStops_[i] < column) {
      this.setCursorColumn(this.tabStops_[i]);
      return;
    }
  }

  this.setCursorColumn(1);
};

/**
 * Set a tab stop at the given column.
 *
 * @param {int} column Zero based column.
 */
hterm.Terminal.prototype.setTabStop = function(column) {
  for (var i = this.tabStops_.length - 1; i >= 0; i--) {
    if (this.tabStops_[i] == column)
      return;

    if (this.tabStops_[i] < column) {
      this.tabStops_.splice(i + 1, 0, column);
      return;
    }
  }

  this.tabStops_.splice(0, 0, column);
};

/**
 * Clear the tab stop at the current cursor position.
 *
 * No effect if there is no tab stop at the current cursor position.
 */
hterm.Terminal.prototype.clearTabStopAtCursor = function() {
  var column = this.screen_.cursorPosition.column;

  var i = this.tabStops_.indexOf(column);
  if (i == -1)
    return;

  this.tabStops_.splice(i, 1);
};

/**
 * Clear all tab stops.
 */
hterm.Terminal.prototype.clearAllTabStops = function() {
  this.tabStops_.length = 0;
  this.defaultTabStops = false;
};

/**
 * Set up the default tab stops, starting from a given column.
 *
 * This sets a tabstop every (column % this.tabWidth) column, starting
 * from the specified column, or 0 if no column is provided.  It also flags
 * future resizes to set them up.
 *
 * This does not clear the existing tab stops first, use clearAllTabStops
 * for that.
 *
 * @param {int} opt_start Optional starting zero based starting column, useful
 *     for filling out missing tab stops when the terminal is resized.
 */
hterm.Terminal.prototype.setDefaultTabStops = function(opt_start) {
  var start = opt_start || 0;
  var w = this.tabWidth;
  // Round start up to a default tab stop.
  start = start - 1 - ((start - 1) % w) + w;
  for (var i = start; i < this.screenSize.width; i += w) {
    this.setTabStop(i);
  }

  this.defaultTabStops = true;
};

/**
 * Interpret a sequence of characters.
 *
 * Incomplete escape sequences are buffered until the next call.
 *
 * @param {string} str Sequence of characters to interpret or pass through.
 */
hterm.Terminal.prototype.interpret = function(str) {
  this.vt.interpret(str);
  this.scheduleSyncCursorPosition_();
};

/**
 * Take over the given DIV for use as the terminal display.
 *
 * @param {HTMLDivElement} div The div to use as the terminal display.
 */
hterm.Terminal.prototype.decorate = function(div) {
  this.div_ = div;

  this.scrollPort_.decorate(div);
  this.scrollPort_.setBackgroundImage(this.prefs_.get('background-image'));
  this.scrollPort_.setBackgroundSize(this.prefs_.get('background-size'));
  this.scrollPort_.setBackgroundPosition(
      this.prefs_.get('background-position'));
  this.scrollPort_.setUserCss(this.prefs_.get('user-css'));

  this.div_.focus = this.focus.bind(this);

  this.setFontSize(this.prefs_.get('font-size'));
  this.syncFontFamily();

  this.setScrollbarVisible(this.prefs_.get('scrollbar-visible'));

  this.document_ = this.scrollPort_.getDocument();

  this.document_.body.oncontextmenu = function() { return false };

  var onMouse = this.onMouse_.bind(this);
  var screenNode = this.scrollPort_.getScreenNode();
  screenNode.addEventListener('mousedown', onMouse);
  screenNode.addEventListener('mouseup', onMouse);
  screenNode.addEventListener('mousemove', onMouse);
  this.scrollPort_.onScrollWheel = onMouse;

  screenNode.addEventListener(
      'focus', this.onFocusChange_.bind(this, true));
  screenNode.addEventListener(
      'blur', this.onFocusChange_.bind(this, false));

  var style = this.document_.createElement('style');
  style.textContent =
      ('.cursor-node[focus="false"] {' +
       '  box-sizing: border-box;' +
       '  background-color: transparent !important;' +
       '  border-width: 2px;' +
       '  border-style: solid;' +
       '}' +
       '.wc-node {' +
       '  display: inline-block;' +
       '  text-align: center;' +
       '  width: ' + this.scrollPort_.characterSize.width * 2 + 'px;' +
       '}');
  this.document_.head.appendChild(style);

  var styleSheets = this.document_.styleSheets;
  var cssRules = styleSheets[styleSheets.length - 1].cssRules;
  this.wcCssRule_ = cssRules[cssRules.length - 1];

  this.cursorNode_ = this.document_.createElement('div');
  this.cursorNode_.className = 'cursor-node';
  this.cursorNode_.style.cssText =
      ('position: absolute;' +
       'top: -99px;' +
       'display: block;' +
       'width: ' + this.scrollPort_.characterSize.width + 'px;' +
       'height: ' + this.scrollPort_.characterSize.height + 'px;' +
       '-webkit-transition: opacity, background-color 100ms linear;');

  this.setCursorColor(this.prefs_.get('cursor-color'));
  this.setCursorBlink(!!this.prefs_.get('cursor-blink'));
  this.restyleCursor_();

  this.document_.body.appendChild(this.cursorNode_);

  // When 'enableMouseDragScroll' is off we reposition this element directly
  // under the mouse cursor after a click.  This makes Chrome associate
  // subsequent mousemove events with the scroll-blocker.  Since the
  // scroll-blocker is a peer (not a child) of the scrollport, the mousemove
  // events do not cause the scrollport to scroll.
  //
  // It's a hack, but it's the cleanest way I could find.
  this.scrollBlockerNode_ = this.document_.createElement('div');
  this.scrollBlockerNode_.style.cssText =
      ('position: absolute;' +
       'top: -99px;' +
       'display: block;' +
       'width: 10px;' +
       'height: 10px;');
  this.document_.body.appendChild(this.scrollBlockerNode_);

  var onMouse = this.onMouse_.bind(this);
  this.scrollPort_.onScrollWheel = onMouse;
  ['mousedown', 'mouseup', 'mousemove', 'click', 'dblclick',
   ].forEach(function(event) {
       this.scrollBlockerNode_.addEventListener(event, onMouse);
       this.cursorNode_.addEventListener(event, onMouse);
       this.document_.addEventListener(event, onMouse);
     }.bind(this));

  this.cursorNode_.addEventListener('mousedown', function() {
      setTimeout(this.focus.bind(this));
    }.bind(this));

  this.setReverseVideo(false);

  this.scrollPort_.focus();
  this.scrollPort_.scheduleRedraw();
};

/**
 * Return the HTML document that contains the terminal DOM nodes.
 */
hterm.Terminal.prototype.getDocument = function() {
  return this.document_;
};

/**
 * Focus the terminal.
 */
hterm.Terminal.prototype.focus = function() {
  this.scrollPort_.focus();
};

/**
 * Return the HTML Element for a given row index.
 *
 * This is a method from the RowProvider interface.  The ScrollPort uses
 * it to fetch rows on demand as they are scrolled into view.
 *
 * TODO(rginda): Consider saving scrollback rows as (HTML source, text content)
 * pairs to conserve memory.
 *
 * @param {integer} index The zero-based row index, measured relative to the
 *     start of the scrollback buffer.  On-screen rows will always have the
 *     largest indicies.
 * @return {HTMLElement} The 'x-row' element containing for the requested row.
 */
hterm.Terminal.prototype.getRowNode = function(index) {
  if (index < this.scrollbackRows_.length)
    return this.scrollbackRows_[index];

  var screenIndex = index - this.scrollbackRows_.length;
  return this.screen_.rowsArray[screenIndex];
};

/**
 * Return the text content for a given range of rows.
 *
 * This is a method from the RowProvider interface.  The ScrollPort uses
 * it to fetch text content on demand when the user attempts to copy their
 * selection to the clipboard.
 *
 * @param {integer} start The zero-based row index to start from, measured
 *     relative to the start of the scrollback buffer.  On-screen rows will
 *     always have the largest indicies.
 * @param {integer} end The zero-based row index to end on, measured
 *     relative to the start of the scrollback buffer.
 * @return {string} A single string containing the text value of the range of
 *     rows.  Lines will be newline delimited, with no trailing newline.
 */
hterm.Terminal.prototype.getRowsText = function(start, end) {
  var ary = [];
  for (var i = start; i < end; i++) {
    var node = this.getRowNode(i);
    ary.push(node.textContent);
    if (i < end - 1 && !node.getAttribute('line-overflow'))
      ary.push('\n');
  }

  return ary.join('');
};

/**
 * Return the text content for a given row.
 *
 * This is a method from the RowProvider interface.  The ScrollPort uses
 * it to fetch text content on demand when the user attempts to copy their
 * selection to the clipboard.
 *
 * @param {integer} index The zero-based row index to return, measured
 *     relative to the start of the scrollback buffer.  On-screen rows will
 *     always have the largest indicies.
 * @return {string} A string containing the text value of the selected row.
 */
hterm.Terminal.prototype.getRowText = function(index) {
  var node = this.getRowNode(index);
  return node.textContent;
};

/**
 * Return the total number of rows in the addressable screen and in the
 * scrollback buffer of this terminal.
 *
 * This is a method from the RowProvider interface.  The ScrollPort uses
 * it to compute the size of the scrollbar.
 *
 * @return {integer} The number of rows in this terminal.
 */
hterm.Terminal.prototype.getRowCount = function() {
  return this.scrollbackRows_.length + this.screen_.rowsArray.length;
};

/**
 * Create DOM nodes for new rows and append them to the end of the terminal.
 *
 * This is the only correct way to add a new DOM node for a row.  Notice that
 * the new row is appended to the bottom of the list of rows, and does not
 * require renumbering (of the rowIndex property) of previous rows.
 *
 * If you think you want a new blank row somewhere in the middle of the
 * terminal, look into moveRows_().
 *
 * This method does not pay attention to vtScrollTop/Bottom, since you should
 * be using moveRows() in cases where they would matter.
 *
 * The cursor will be positioned at column 0 of the first inserted line.
 */
hterm.Terminal.prototype.appendRows_ = function(count) {
  var cursorRow = this.screen_.rowsArray.length;
  var offset = this.scrollbackRows_.length + cursorRow;
  for (var i = 0; i < count; i++) {
    var row = this.document_.createElement('x-row');
    row.appendChild(this.document_.createTextNode(''));
    row.rowIndex = offset + i;
    this.screen_.pushRow(row);
  }

  var extraRows = this.screen_.rowsArray.length - this.screenSize.height;
  if (extraRows > 0) {
    var ary = this.screen_.shiftRows(extraRows);
    Array.prototype.push.apply(this.scrollbackRows_, ary);
    if (this.scrollPort_.isScrolledEnd)
      this.scheduleScrollDown_();
  }

  if (cursorRow >= this.screen_.rowsArray.length)
    cursorRow = this.screen_.rowsArray.length - 1;

  this.setAbsoluteCursorPosition(cursorRow, 0);
};

/**
 * Relocate rows from one part of the addressable screen to another.
 *
 * This is used to recycle rows during VT scrolls (those which are driven
 * by VT commands, rather than by the user manipulating the scrollbar.)
 *
 * In this case, the blank lines scrolled into the scroll region are made of
 * the nodes we scrolled off.  These have their rowIndex properties carefully
 * renumbered so as not to confuse the ScrollPort.
 */
hterm.Terminal.prototype.moveRows_ = function(fromIndex, count, toIndex) {
  var ary = this.screen_.removeRows(fromIndex, count);
  this.screen_.insertRows(toIndex, ary);

  var start, end;
  if (fromIndex < toIndex) {
    start = fromIndex;
    end = toIndex + count;
  } else {
    start = toIndex;
    end = fromIndex + count;
  }

  this.renumberRows_(start, end);
  this.scrollPort_.scheduleInvalidate();
};

/**
 * Renumber the rowIndex property of the given range of rows.
 *
 * The start and end indicies are relative to the screen, not the scrollback.
 * Rows in the scrollback buffer cannot be renumbered.  Since they are not
 * addressable (you can't delete them, scroll them, etc), you should have
 * no need to renumber scrollback rows.
 */
hterm.Terminal.prototype.renumberRows_ = function(start, end, opt_screen) {
  var screen = opt_screen || this.screen_;

  var offset = this.scrollbackRows_.length;
  for (var i = start; i < end; i++) {
    screen.rowsArray[i].rowIndex = offset + i;
  }
};

/**
 * Print a string to the terminal.
 *
 * This respects the current insert and wraparound modes.  It will add new lines
 * to the end of the terminal, scrolling off the top into the scrollback buffer
 * if necessary.
 *
 * The string is *not* parsed for escape codes.  Use the interpret() method if
 * that's what you're after.
 *
 * @param{string} str The string to print.
 */
hterm.Terminal.prototype.print = function(str) {
  var startOffset = 0;

  var strWidth = lib.wc.strWidth(str);

  while (startOffset < strWidth) {
    if (this.options_.wraparound && this.screen_.cursorPosition.overflow) {
      this.screen_.commitLineOverflow();
      this.newLine();
    }

    var count = strWidth - startOffset;
    var didOverflow = false;
    var substr;

    if (this.screen_.cursorPosition.column + count >= this.screenSize.width) {
      didOverflow = true;
      count = this.screenSize.width - this.screen_.cursorPosition.column;
    }

    if (didOverflow && !this.options_.wraparound) {
      // If the string overflowed the line but wraparound is off, then the
      // last printed character should be the last of the string.
      // TODO: This will add to our problems with multibyte UTF-16 characters.
      substr = lib.wc.substr(str, startOffset, count - 1) +
          lib.wc.substr(str, strWidth - 1);
      count = strWidth;
    } else {
      substr = lib.wc.substr(str, startOffset, count);
    }

    var tokens = hterm.TextAttributes.splitWidecharString(substr);
    for (var i = 0; i < tokens.length; i++) {
      if (tokens[i].wcNode)
        this.screen_.textAttributes.wcNode = true;

      if (this.options_.insertMode) {
          this.screen_.insertString(tokens[i].str);
      } else {
        this.screen_.overwriteString(tokens[i].str);
      }
      this.screen_.textAttributes.wcNode = false;
    }

    this.screen_.maybeClipCurrentRow();
    startOffset += count;
  }

  this.scheduleSyncCursorPosition_();

  if (this.scrollOnOutput_)
    this.scrollPort_.scrollRowToBottom(this.getRowCount());
};

/**
 * Set the VT scroll region.
 *
 * This also resets the cursor position to the absolute (0, 0) position, since
 * that's what xterm appears to do.
 *
 * Setting the scroll region to the full height of the terminal will clear
 * the scroll region.  This is *NOT* what most terminals do.  We're explicitly
 * going "off-spec" here because it makes `screen` and `tmux` overflow into the
 * local scrollback buffer, which means the scrollbars and shift-pgup/pgdn
 * continue to work as most users would expect.
 *
 * @param {integer} scrollTop The zero-based top of the scroll region.
 * @param {integer} scrollBottom The zero-based bottom of the scroll region,
 *     inclusive.
 */
hterm.Terminal.prototype.setVTScrollRegion = function(scrollTop, scrollBottom) {
  if (scrollTop == 0 && scrollBottom == this.screenSize.height - 1) {
    this.vtScrollTop_ = null;
    this.vtScrollBottom_ = null;
  } else {
    this.vtScrollTop_ = scrollTop;
    this.vtScrollBottom_ = scrollBottom;
  }
};

/**
 * Return the top row index according to the VT.
 *
 * This will return 0 unless the terminal has been told to restrict scrolling
 * to some lower row.  It is used for some VT cursor positioning and scrolling
 * commands.
 *
 * @return {integer} The topmost row in the terminal's scroll region.
 */
hterm.Terminal.prototype.getVTScrollTop = function() {
  if (this.vtScrollTop_ != null)
    return this.vtScrollTop_;

  return 0;
};

/**
 * Return the bottom row index according to the VT.
 *
 * This will return the height of the terminal unless the it has been told to
 * restrict scrolling to some higher row.  It is used for some VT cursor
 * positioning and scrolling commands.
 *
 * @return {integer} The bottommost row in the terminal's scroll region.
 */
hterm.Terminal.prototype.getVTScrollBottom = function() {
  if (this.vtScrollBottom_ != null)
    return this.vtScrollBottom_;

  return this.screenSize.height - 1;
}

/**
 * Process a '\n' character.
 *
 * If the cursor is on the final row of the terminal this will append a new
 * blank row to the screen and scroll the topmost row into the scrollback
 * buffer.
 *
 * Otherwise, this moves the cursor to column zero of the next row.
 */
hterm.Terminal.prototype.newLine = function() {
  var cursorAtEndOfScreen = (this.screen_.cursorPosition.row ==
                             this.screen_.rowsArray.length - 1);

  if (this.vtScrollBottom_ != null) {
    // A VT Scroll region is active, we never append new rows.
    if (this.screen_.cursorPosition.row == this.vtScrollBottom_) {
      // We're at the end of the VT Scroll Region, perform a VT scroll.
      this.vtScrollUp(1);
      this.setAbsoluteCursorPosition(this.screen_.cursorPosition.row, 0);
    } else if (cursorAtEndOfScreen) {
      // We're at the end of the screen, the only thing to do is put the
      // cursor to column 0.
      this.setAbsoluteCursorPosition(this.screen_.cursorPosition.row, 0);
    } else {
      // Anywhere else, advance the cursor row, and reset the column.
      this.setAbsoluteCursorPosition(this.screen_.cursorPosition.row + 1, 0);
    }
  } else if (cursorAtEndOfScreen) {
    // We're at the end of the screen.  Append a new row to the terminal,
    // shifting the top row into the scrollback.
    this.appendRows_(1);
  } else {
    // Anywhere else in the screen just moves the cursor.
    this.setAbsoluteCursorPosition(this.screen_.cursorPosition.row + 1, 0);
  }
};

/**
 * Like newLine(), except maintain the cursor column.
 */
hterm.Terminal.prototype.lineFeed = function() {
  var column = this.screen_.cursorPosition.column;
  this.newLine();
  this.setCursorColumn(column);
};

/**
 * If autoCarriageReturn is set then newLine(), else lineFeed().
 */
hterm.Terminal.prototype.formFeed = function() {
  if (this.options_.autoCarriageReturn) {
    this.newLine();
  } else {
    this.lineFeed();
  }
};

/**
 * Move the cursor up one row, possibly inserting a blank line.
 *
 * The cursor column is not changed.
 */
hterm.Terminal.prototype.reverseLineFeed = function() {
  var scrollTop = this.getVTScrollTop();
  var currentRow = this.screen_.cursorPosition.row;

  if (currentRow == scrollTop) {
    this.insertLines(1);
  } else {
    this.setAbsoluteCursorRow(currentRow - 1);
  }
};

/**
 * Replace all characters to the left of the current cursor with the space
 * character.
 *
 * TODO(rginda): This should probably *remove* the characters (not just replace
 * with a space) if there are no characters at or beyond the current cursor
 * position.
 */
hterm.Terminal.prototype.eraseToLeft = function() {
  var cursor = this.saveCursor();
  this.setCursorColumn(0);
  this.screen_.overwriteString(lib.f.getWhitespace(cursor.column + 1));
  this.restoreCursor(cursor);
};

/**
 * Erase a given number of characters to the right of the cursor.
 *
 * The cursor position is unchanged.
 *
 * If the current background color is not the default background color this
 * will insert spaces rather than delete.  This is unfortunate because the
 * trailing space will affect text selection, but it's difficult to come up
 * with a way to style empty space that wouldn't trip up the hterm.Screen
 * code.
 *
 * eraseToRight is ignored in the presence of a cursor overflow.  This deviates
 * from xterm, but agrees with gnome-terminal and konsole, xfce4-terminal.  See
 * crbug.com/232390 for details.
 */
hterm.Terminal.prototype.eraseToRight = function(opt_count) {
  if (this.screen_.cursorPosition.overflow)
    return;

  var maxCount = this.screenSize.width - this.screen_.cursorPosition.column;
  var count = opt_count ? Math.min(opt_count, maxCount) : maxCount;

  if (this.screen_.textAttributes.background ===
      this.screen_.textAttributes.DEFAULT_COLOR) {
    var cursorRow = this.screen_.rowsArray[this.screen_.cursorPosition.row];
    if (hterm.TextAttributes.nodeWidth(cursorRow) <=
        this.screen_.cursorPosition.column + count) {
      this.screen_.deleteChars(count);
      this.clearCursorOverflow();
      return;
    }
  }

  var cursor = this.saveCursor();
  this.screen_.overwriteString(lib.f.getWhitespace(count));
  this.restoreCursor(cursor);
  this.clearCursorOverflow();
};

/**
 * Erase the current line.
 *
 * The cursor position is unchanged.
 */
hterm.Terminal.prototype.eraseLine = function() {
  var cursor = this.saveCursor();
  this.screen_.clearCursorRow();
  this.restoreCursor(cursor);
  this.clearCursorOverflow();
};

/**
 * Erase all characters from the start of the screen to the current cursor
 * position, regardless of scroll region.
 *
 * The cursor position is unchanged.
 */
hterm.Terminal.prototype.eraseAbove = function() {
  var cursor = this.saveCursor();

  this.eraseToLeft();

  for (var i = 0; i < cursor.row; i++) {
    this.setAbsoluteCursorPosition(i, 0);
    this.screen_.clearCursorRow();
  }

  this.restoreCursor(cursor);
  this.clearCursorOverflow();
};

/**
 * Erase all characters from the current cursor position to the end of the
 * screen, regardless of scroll region.
 *
 * The cursor position is unchanged.
 */
hterm.Terminal.prototype.eraseBelow = function() {
  var cursor = this.saveCursor();

  this.eraseToRight();

  var bottom = this.screenSize.height - 1;
  for (var i = cursor.row + 1; i <= bottom; i++) {
    this.setAbsoluteCursorPosition(i, 0);
    this.screen_.clearCursorRow();
  }

  this.restoreCursor(cursor);
  this.clearCursorOverflow();
};

/**
 * Fill the terminal with a given character.
 *
 * This methods does not respect the VT scroll region.
 *
 * @param {string} ch The character to use for the fill.
 */
hterm.Terminal.prototype.fill = function(ch) {
  var cursor = this.saveCursor();

  this.setAbsoluteCursorPosition(0, 0);
  for (var row = 0; row < this.screenSize.height; row++) {
    for (var col = 0; col < this.screenSize.width; col++) {
      this.setAbsoluteCursorPosition(row, col);
      this.screen_.overwriteString(ch);
    }
  }

  this.restoreCursor(cursor);
};

/**
 * Erase the entire display and leave the cursor at (0, 0).
 *
 * This does not respect the scroll region.
 *
 * @param {hterm.Screen} opt_screen Optional screen to operate on.  Defaults
 *     to the current screen.
 */
hterm.Terminal.prototype.clearHome = function(opt_screen) {
  var screen = opt_screen || this.screen_;
  var bottom = screen.getHeight();

  if (bottom == 0) {
    // Empty screen, nothing to do.
    return;
  }

  for (var i = 0; i < bottom; i++) {
    screen.setCursorPosition(i, 0);
    screen.clearCursorRow();
  }

  screen.setCursorPosition(0, 0);
};

/**
 * Erase the entire display without changing the cursor position.
 *
 * The cursor position is unchanged.  This does not respect the scroll
 * region.
 *
 * @param {hterm.Screen} opt_screen Optional screen to operate on.  Defaults
 *     to the current screen.
 */
hterm.Terminal.prototype.clear = function(opt_screen) {
  var screen = opt_screen || this.screen_;
  var cursor = screen.cursorPosition.clone();
  this.clearHome(screen);
  screen.setCursorPosition(cursor.row, cursor.column);
};

/**
 * VT command to insert lines at the current cursor row.
 *
 * This respects the current scroll region.  Rows pushed off the bottom are
 * lost (they won't show up in the scrollback buffer).
 *
 * @param {integer} count The number of lines to insert.
 */
hterm.Terminal.prototype.insertLines = function(count) {
  var cursorRow = this.screen_.cursorPosition.row;

  var bottom = this.getVTScrollBottom();
  count = Math.min(count, bottom - cursorRow);

  // The moveCount is the number of rows we need to relocate to make room for
  // the new row(s).  The count is the distance to move them.
  var moveCount = bottom - cursorRow - count + 1;
  if (moveCount)
    this.moveRows_(cursorRow, moveCount, cursorRow + count);

  for (var i = count - 1; i >= 0; i--) {
    this.setAbsoluteCursorPosition(cursorRow + i, 0);
    this.screen_.clearCursorRow();
  }
};

/**
 * VT command to delete lines at the current cursor row.
 *
 * New rows are added to the bottom of scroll region to take their place.  New
 * rows are strictly there to take up space and have no content or style.
 */
hterm.Terminal.prototype.deleteLines = function(count) {
  var cursor = this.saveCursor();

  var top = cursor.row;
  var bottom = this.getVTScrollBottom();

  var maxCount = bottom - top + 1;
  count = Math.min(count, maxCount);

  var moveStart = bottom - count + 1;
  if (count != maxCount)
    this.moveRows_(top, count, moveStart);

  for (var i = 0; i < count; i++) {
    this.setAbsoluteCursorPosition(moveStart + i, 0);
    this.screen_.clearCursorRow();
  }

  this.restoreCursor(cursor);
  this.clearCursorOverflow();
};

/**
 * Inserts the given number of spaces at the current cursor position.
 *
 * The cursor position is not changed.
 */
hterm.Terminal.prototype.insertSpace = function(count) {
  var cursor = this.saveCursor();

  var ws = lib.f.getWhitespace(count || 1);
  this.screen_.insertString(ws);
  this.screen_.maybeClipCurrentRow();

  this.restoreCursor(cursor);
  this.clearCursorOverflow();
};

/**
 * Forward-delete the specified number of characters starting at the cursor
 * position.
 *
 * @param {integer} count The number of characters to delete.
 */
hterm.Terminal.prototype.deleteChars = function(count) {
  var deleted = this.screen_.deleteChars(count);
  if (deleted && !this.screen_.textAttributes.isDefault()) {
    var cursor = this.saveCursor();
    this.setCursorColumn(this.screenSize.width - deleted);
    this.screen_.insertString(lib.f.getWhitespace(deleted));
    this.restoreCursor(cursor);
  }

  this.clearCursorOverflow();
};

/**
 * Shift rows in the scroll region upwards by a given number of lines.
 *
 * New rows are inserted at the bottom of the scroll region to fill the
 * vacated rows.  The new rows not filled out with the current text attributes.
 *
 * This function does not affect the scrollback rows at all.  Rows shifted
 * off the top are lost.
 *
 * The cursor position is not altered.
 *
 * @param {integer} count The number of rows to scroll.
 */
hterm.Terminal.prototype.vtScrollUp = function(count) {
  var cursor = this.saveCursor();

  this.setAbsoluteCursorRow(this.getVTScrollTop());
  this.deleteLines(count);

  this.restoreCursor(cursor);
};

/**
 * Shift rows below the cursor down by a given number of lines.
 *
 * This function respects the current scroll region.
 *
 * New rows are inserted at the top of the scroll region to fill the
 * vacated rows.  The new rows not filled out with the current text attributes.
 *
 * This function does not affect the scrollback rows at all.  Rows shifted
 * off the bottom are lost.
 *
 * @param {integer} count The number of rows to scroll.
 */
hterm.Terminal.prototype.vtScrollDown = function(opt_count) {
  var cursor = this.saveCursor();

  this.setAbsoluteCursorPosition(this.getVTScrollTop(), 0);
  this.insertLines(opt_count);

  this.restoreCursor(cursor);
};


/**
 * Set the cursor position.
 *
 * The cursor row is relative to the scroll region if the terminal has
 * 'origin mode' enabled, or relative to the addressable screen otherwise.
 *
 * @param {integer} row The new zero-based cursor row.
 * @param {integer} row The new zero-based cursor column.
 */
hterm.Terminal.prototype.setCursorPosition = function(row, column) {
  if (this.options_.originMode) {
    this.setRelativeCursorPosition(row, column);
  } else {
    this.setAbsoluteCursorPosition(row, column);
  }
};

hterm.Terminal.prototype.setRelativeCursorPosition = function(row, column) {
  var scrollTop = this.getVTScrollTop();
  row = lib.f.clamp(row + scrollTop, scrollTop, this.getVTScrollBottom());
  column = lib.f.clamp(column, 0, this.screenSize.width - 1);
  this.screen_.setCursorPosition(row, column);
};

hterm.Terminal.prototype.setAbsoluteCursorPosition = function(row, column) {
  row = lib.f.clamp(row, 0, this.screenSize.height - 1);
  column = lib.f.clamp(column, 0, this.screenSize.width - 1);
  this.screen_.setCursorPosition(row, column);
};

/**
 * Set the cursor column.
 *
 * @param {integer} column The new zero-based cursor column.
 */
hterm.Terminal.prototype.setCursorColumn = function(column) {
  this.setAbsoluteCursorPosition(this.screen_.cursorPosition.row, column);
};

/**
 * Return the cursor column.
 *
 * @return {integer} The zero-based cursor column.
 */
hterm.Terminal.prototype.getCursorColumn = function() {
  return this.screen_.cursorPosition.column;
};

/**
 * Set the cursor row.
 *
 * The cursor row is relative to the scroll region if the terminal has
 * 'origin mode' enabled, or relative to the addressable screen otherwise.
 *
 * @param {integer} row The new cursor row.
 */
hterm.Terminal.prototype.setAbsoluteCursorRow = function(row) {
  this.setAbsoluteCursorPosition(row, this.screen_.cursorPosition.column);
};

/**
 * Return the cursor row.
 *
 * @return {integer} The zero-based cursor row.
 */
hterm.Terminal.prototype.getCursorRow = function(row) {
  return this.screen_.cursorPosition.row;
};

/**
 * Request that the ScrollPort redraw itself soon.
 *
 * The redraw will happen asynchronously, soon after the call stack winds down.
 * Multiple calls will be coalesced into a single redraw.
 */
hterm.Terminal.prototype.scheduleRedraw_ = function() {
  if (this.timeouts_.redraw)
    return;

  var self = this;
  this.timeouts_.redraw = setTimeout(function() {
      delete self.timeouts_.redraw;
      self.scrollPort_.redraw_();
    }, 0);
};

/**
 * Request that the ScrollPort be scrolled to the bottom.
 *
 * The scroll will happen asynchronously, soon after the call stack winds down.
 * Multiple calls will be coalesced into a single scroll.
 *
 * This affects the scrollbar position of the ScrollPort, and has nothing to
 * do with the VT scroll commands.
 */
hterm.Terminal.prototype.scheduleScrollDown_ = function() {
  if (this.timeouts_.scrollDown)
    return;

  var self = this;
  this.timeouts_.scrollDown = setTimeout(function() {
      delete self.timeouts_.scrollDown;
      self.scrollPort_.scrollRowToBottom(self.getRowCount());
    }, 10);
};

/**
 * Move the cursor up a specified number of rows.
 *
 * @param {integer} count The number of rows to move the cursor.
 */
hterm.Terminal.prototype.cursorUp = function(count) {
  return this.cursorDown(-(count || 1));
};

/**
 * Move the cursor down a specified number of rows.
 *
 * @param {integer} count The number of rows to move the cursor.
 */
hterm.Terminal.prototype.cursorDown = function(count) {
  count = count || 1;
  var minHeight = (this.options_.originMode ? this.getVTScrollTop() : 0);
  var maxHeight = (this.options_.originMode ? this.getVTScrollBottom() :
                   this.screenSize.height - 1);

  var row = lib.f.clamp(this.screen_.cursorPosition.row + count,
                        minHeight, maxHeight);
  this.setAbsoluteCursorRow(row);
};

/**
 * Move the cursor left a specified number of columns.
 *
 * @param {integer} count The number of columns to move the cursor.
 */
hterm.Terminal.prototype.cursorLeft = function(count) {
  return this.cursorRight(-(count || 1));
};

/**
 * Move the cursor right a specified number of columns.
 *
 * @param {integer} count The number of columns to move the cursor.
 */
hterm.Terminal.prototype.cursorRight = function(count) {
  count = count || 1;
  var column = lib.f.clamp(this.screen_.cursorPosition.column + count,
                           0, this.screenSize.width - 1);
  this.setCursorColumn(column);
};

/**
 * Reverse the foreground and background colors of the terminal.
 *
 * This only affects text that was drawn with no attributes.
 *
 * TODO(rginda): Test xterm to see if reverse is respected for text that has
 * been drawn with attributes that happen to coincide with the default
 * 'no-attribute' colors.  My guess is probably not.
 */
hterm.Terminal.prototype.setReverseVideo = function(state) {
  this.options_.reverseVideo = state;
  if (state) {
    this.scrollPort_.setForegroundColor(this.prefs_.get('background-color'));
    this.scrollPort_.setBackgroundColor(this.prefs_.get('foreground-color'));
  } else {
    this.scrollPort_.setForegroundColor(this.prefs_.get('foreground-color'));
    this.scrollPort_.setBackgroundColor(this.prefs_.get('background-color'));
  }
};

/**
 * Ring the terminal bell.
 *
 * This will not play the bell audio more than once per second.
 */
hterm.Terminal.prototype.ringBell = function() {
  this.cursorNode_.style.backgroundColor =
      this.scrollPort_.getForegroundColor();

  var self = this;
  setTimeout(function() {
      self.cursorNode_.style.backgroundColor = self.prefs_.get('cursor-color');
    }, 200);

  if (this.bellAudio_.getAttribute('src')) {
    if (this.bellSquelchTimeout_)
      return;

    this.bellAudio_.play();

    this.bellSequelchTimeout_ = setTimeout(function() {
        delete this.bellSquelchTimeout_;
      }.bind(this), 500);
  } else {
    delete this.bellSquelchTimeout_;
  }
};

/**
 * Set the origin mode bit.
 *
 * If origin mode is on, certain VT cursor and scrolling commands measure their
 * row parameter relative to the VT scroll region.  Otherwise, row 0 corresponds
 * to the top of the addressable screen.
 *
 * Defaults to off.
 *
 * @param {boolean} state True to set origin mode, false to unset.
 */
hterm.Terminal.prototype.setOriginMode = function(state) {
  this.options_.originMode = state;
  this.setCursorPosition(0, 0);
};

/**
 * Set the insert mode bit.
 *
 * If insert mode is on, existing text beyond the cursor position will be
 * shifted right to make room for new text.  Otherwise, new text overwrites
 * any existing text.
 *
 * Defaults to off.
 *
 * @param {boolean} state True to set insert mode, false to unset.
 */
hterm.Terminal.prototype.setInsertMode = function(state) {
  this.options_.insertMode = state;
};

/**
 * Set the auto carriage return bit.
 *
 * If auto carriage return is on then a formfeed character is interpreted
 * as a newline, otherwise it's the same as a linefeed.  The difference boils
 * down to whether or not the cursor column is reset.
 */
hterm.Terminal.prototype.setAutoCarriageReturn = function(state) {
  this.options_.autoCarriageReturn = state;
};

/**
 * Set the wraparound mode bit.
 *
 * If wraparound mode is on, certain VT commands will allow the cursor to wrap
 * to the start of the following row.  Otherwise, the cursor is clamped to the
 * end of the screen and attempts to write past it are ignored.
 *
 * Defaults to on.
 *
 * @param {boolean} state True to set wraparound mode, false to unset.
 */
hterm.Terminal.prototype.setWraparound = function(state) {
  this.options_.wraparound = state;
};

/**
 * Set the reverse-wraparound mode bit.
 *
 * If wraparound mode is off, certain VT commands will allow the cursor to wrap
 * to the end of the previous row.  Otherwise, the cursor is clamped to column
 * 0.
 *
 * Defaults to off.
 *
 * @param {boolean} state True to set reverse-wraparound mode, false to unset.
 */
hterm.Terminal.prototype.setReverseWraparound = function(state) {
  this.options_.reverseWraparound = state;
};

/**
 * Selects between the primary and alternate screens.
 *
 * If alternate mode is on, the alternate screen is active.  Otherwise the
 * primary screen is active.
 *
 * Swapping screens has no effect on the scrollback buffer.
 *
 * Each screen maintains its own cursor position.
 *
 * Defaults to off.
 *
 * @param {boolean} state True to set alternate mode, false to unset.
 */
hterm.Terminal.prototype.setAlternateMode = function(state) {
  var cursor = this.saveCursor();
  this.screen_ = state ? this.alternateScreen_ : this.primaryScreen_;

  if (this.screen_.rowsArray.length &&
      this.screen_.rowsArray[0].rowIndex != this.scrollbackRows_.length) {
    // If the screen changed sizes while we were away, our rowIndexes may
    // be incorrect.
    var offset = this.scrollbackRows_.length;
    var ary = this.screen_.rowsArray;
    for (var i = 0; i < ary.length; i++) {
      ary[i].rowIndex = offset + i;
    }
  }

  this.realizeWidth_(this.screenSize.width);
  this.realizeHeight_(this.screenSize.height);
  this.scrollPort_.syncScrollHeight();
  this.scrollPort_.invalidate();

  this.restoreCursor(cursor);
  this.scrollPort_.resize();
};

/**
 * Set the cursor-blink mode bit.
 *
 * If cursor-blink is on, the cursor will blink when it is visible.  Otherwise
 * a visible cursor does not blink.
 *
 * You should make sure to turn blinking off if you're going to dispose of a
 * terminal, otherwise you'll leak a timeout.
 *
 * Defaults to on.
 *
 * @param {boolean} state True to set cursor-blink mode, false to unset.
 */
hterm.Terminal.prototype.setCursorBlink = function(state) {
  this.options_.cursorBlink = state;

  if (!state && this.timeouts_.cursorBlink) {
    clearTimeout(this.timeouts_.cursorBlink);
    delete this.timeouts_.cursorBlink;
  }

  if (this.options_.cursorVisible)
    this.setCursorVisible(true);
};

/**
 * Set the cursor-visible mode bit.
 *
 * If cursor-visible is on, the cursor will be visible.  Otherwise it will not.
 *
 * Defaults to on.
 *
 * @param {boolean} state True to set cursor-visible mode, false to unset.
 */
hterm.Terminal.prototype.setCursorVisible = function(state) {
  this.options_.cursorVisible = state;

  if (!state) {
    this.cursorNode_.style.opacity = '0';
    return;
  }

  this.syncCursorPosition_();

  this.cursorNode_.style.opacity = '1';

  if (this.options_.cursorBlink) {
    if (this.timeouts_.cursorBlink)
      return;

    this.timeouts_.cursorBlink = setInterval(this.onCursorBlink_.bind(this),
                                             500);
  } else {
    if (this.timeouts_.cursorBlink) {
      clearTimeout(this.timeouts_.cursorBlink);
      delete this.timeouts_.cursorBlink;
    }
  }
};

/**
 * Synchronizes the visible cursor and document selection with the current
 * cursor coordinates.
 */
hterm.Terminal.prototype.syncCursorPosition_ = function() {
  var topRowIndex = this.scrollPort_.getTopRowIndex();
  var bottomRowIndex = this.scrollPort_.getBottomRowIndex(topRowIndex);
  var cursorRowIndex = this.scrollbackRows_.length +
      this.screen_.cursorPosition.row;

  if (cursorRowIndex > bottomRowIndex) {
    // Cursor is scrolled off screen, move it outside of the visible area.
    this.cursorNode_.style.top = -this.scrollPort_.characterSize.height + 'px';
    return;
  }

  this.cursorNode_.style.top = this.scrollPort_.visibleRowTopMargin +
      this.scrollPort_.characterSize.height * (cursorRowIndex - topRowIndex) +
      'px';
  this.cursorNode_.style.left = this.scrollPort_.characterSize.width *
      this.screen_.cursorPosition.column + 'px';

  this.cursorNode_.setAttribute('title',
                                '(' + this.screen_.cursorPosition.row +
                                ', ' + this.screen_.cursorPosition.column +
                                ')');

  // Update the caret for a11y purposes.
  var selection = this.document_.getSelection();
  if (selection && selection.isCollapsed)
    this.screen_.syncSelectionCaret(selection);
};

/**
 * Adjusts the style of this.cursorNode_ according to the current cursor shape
 * and character cell dimensions.
 */
hterm.Terminal.prototype.restyleCursor_ = function() {
  var shape = this.cursorShape_;

  if (this.cursorNode_.getAttribute('focus') == 'false') {
    // Always show a block cursor when unfocused.
    shape = hterm.Terminal.cursorShape.BLOCK;
  }

  var style = this.cursorNode_.style;

  style.width = this.scrollPort_.characterSize.width + 'px';

  switch (shape) {
    case hterm.Terminal.cursorShape.BEAM:
      style.height = this.scrollPort_.characterSize.height + 'px';
      style.backgroundColor = 'transparent';
      style.borderBottomStyle = null;
      style.borderLeftStyle = 'solid';
      break;

    case hterm.Terminal.cursorShape.UNDERLINE:
      style.height = this.scrollPort_.characterSize.baseline + 'px';
      style.backgroundColor = 'transparent';
      style.borderBottomStyle = 'solid';
      // correct the size to put it exactly at the baseline
      style.borderLeftStyle = null;
      break;

    default:
      style.height = this.scrollPort_.characterSize.height + 'px';
      style.backgroundColor = this.cursorColor_;
      style.borderBottomStyle = null;
      style.borderLeftStyle = null;
      break;
  }
};

/**
 * Synchronizes the visible cursor with the current cursor coordinates.
 *
 * The sync will happen asynchronously, soon after the call stack winds down.
 * Multiple calls will be coalesced into a single sync.
 */
hterm.Terminal.prototype.scheduleSyncCursorPosition_ = function() {
  if (this.timeouts_.syncCursor)
    return;

  var self = this;
  this.timeouts_.syncCursor = setTimeout(function() {
      self.syncCursorPosition_();
      delete self.timeouts_.syncCursor;
    }, 0);
};

/**
 * Show or hide the zoom warning.
 *
 * The zoom warning is a message warning the user that their browser zoom must
 * be set to 100% in order for hterm to function properly.
 *
 * @param {boolean} state True to show the message, false to hide it.
 */
hterm.Terminal.prototype.showZoomWarning_ = function(state) {
  if (!this.zoomWarningNode_) {
    if (!state)
      return;

    this.zoomWarningNode_ = this.document_.createElement('div');
    this.zoomWarningNode_.style.cssText = (
        'color: black;' +
        'background-color: #ff2222;' +
        'font-size: large;' +
        'border-radius: 8px;' +
        'opacity: 0.75;' +
        'padding: 0.2em 0.5em 0.2em 0.5em;' +
        'top: 0.5em;' +
        'right: 1.2em;' +
        'position: absolute;' +
        '-webkit-text-size-adjust: none;' +
        '-webkit-user-select: none;');
  }

  this.zoomWarningNode_.textContent = lib.MessageManager.replaceReferences(
      hterm.zoomWarningMessage,
      [parseInt(this.scrollPort_.characterSize.zoomFactor * 100)]);

  this.zoomWarningNode_.style.fontFamily = this.prefs_.get('font-family');

  if (state) {
    if (!this.zoomWarningNode_.parentNode)
      this.div_.parentNode.appendChild(this.zoomWarningNode_);
  } else if (this.zoomWarningNode_.parentNode) {
    this.zoomWarningNode_.parentNode.removeChild(this.zoomWarningNode_);
  }
};

/**
 * Show the terminal overlay for a given amount of time.
 *
 * The terminal overlay appears in inverse video in a large font, centered
 * over the terminal.  You should probably keep the overlay message brief,
 * since it's in a large font and you probably aren't going to check the size
 * of the terminal first.
 *
 * @param {string} msg The text (not HTML) message to display in the overlay.
 * @param {number} opt_timeout The amount of time to wait before fading out
 *     the overlay.  Defaults to 1.5 seconds.  Pass null to have the overlay
 *     stay up forever (or until the next overlay).
 */
hterm.Terminal.prototype.showOverlay = function(msg, opt_timeout) {
  if (!this.overlayNode_) {
    if (!this.div_)
      return;

    this.overlayNode_ = this.document_.createElement('div');
    this.overlayNode_.style.cssText = (
        'border-radius: 15px;' +
        'font-size: xx-large;' +
        'opacity: 0.75;' +
        'padding: 0.2em 0.5em 0.2em 0.5em;' +
        'position: absolute;' +
        '-webkit-user-select: none;' +
        '-webkit-transition: opacity 180ms ease-in;');

    this.overlayNode_.addEventListener('mousedown', function(e) {
      e.preventDefault();
      e.stopPropagation();
    }, true);
  }

  this.overlayNode_.style.color = this.prefs_.get('background-color');
  this.overlayNode_.style.backgroundColor = this.prefs_.get('foreground-color');
  this.overlayNode_.style.fontFamily = this.prefs_.get('font-family');

  this.overlayNode_.textContent = msg;
  this.overlayNode_.style.opacity = '0.75';

  if (!this.overlayNode_.parentNode)
    this.div_.appendChild(this.overlayNode_);

  var divSize = hterm.getClientSize(this.div_);
  var overlaySize = hterm.getClientSize(this.overlayNode_);

  this.overlayNode_.style.top = (divSize.height - overlaySize.height) / 2;
  this.overlayNode_.style.left = (divSize.width - overlaySize.width -
      this.scrollPort_.currentScrollbarWidthPx) / 2;

  var self = this;

  if (this.overlayTimeout_)
    clearTimeout(this.overlayTimeout_);

  if (opt_timeout === null)
    return;

  this.overlayTimeout_ = setTimeout(function() {
      self.overlayNode_.style.opacity = '0';
      self.overlayTimeout_ = setTimeout(function() {
          if (self.overlayNode_.parentNode)
            self.overlayNode_.parentNode.removeChild(self.overlayNode_);
          self.overlayTimeout_ = null;
          self.overlayNode_.style.opacity = '0.75';
        }, 200);
    }, opt_timeout || 1500);
};

/**
 * Paste from the system clipboard to the terminal.
 */
hterm.Terminal.prototype.paste = function() {
  hterm.pasteFromClipboard(this.document_);
};

/**
 * Copy a string to the system clipboard.
 *
 * Note: If there is a selected range in the terminal, it'll be cleared.
 */
hterm.Terminal.prototype.copyStringToClipboard = function(str) {
  if (this.prefs_.get('enable-clipboard-notice'))
    setTimeout(this.showOverlay.bind(this, hterm.notifyCopyMessage, 500), 200);

  var copySource = this.document_.createElement('pre');
  copySource.textContent = str;
  copySource.style.cssText = (
      '-webkit-user-select: text;' +
      'position: absolute;' +
      'top: -99px');

  this.document_.body.appendChild(copySource);

  var selection = this.document_.getSelection();
  var anchorNode = selection.anchorNode;
  var anchorOffset = selection.anchorOffset;
  var focusNode = selection.focusNode;
  var focusOffset = selection.focusOffset;

  selection.selectAllChildren(copySource);

  hterm.copySelectionToClipboard(this.document_);

  selection.collapse(anchorNode, anchorOffset);
  selection.extend(focusNode, focusOffset);

  copySource.parentNode.removeChild(copySource);
};

hterm.Terminal.prototype.getSelectionText = function() {
  var selection = this.scrollPort_.selection;
  selection.sync();

  if (selection.isCollapsed)
    return null;


  // Start offset measures from the beginning of the line.
  var startOffset = selection.startOffset;
  var node = selection.startNode;

  if (node.nodeName != 'X-ROW') {
    // If the selection doesn't start on an x-row node, then it must be
    // somewhere inside the x-row.  Add any characters from previous siblings
    // into the start offset.

    if (node.nodeName == '#text' && node.parentNode.nodeName == 'SPAN') {
      // If node is the text node in a styled span, move up to the span node.
      node = node.parentNode;
    }

    while (node.previousSibling) {
      node = node.previousSibling;
      startOffset += hterm.TextAttributes.nodeWidth(node);
    }
  }

  // End offset measures from the end of the line.
  var endOffset = (hterm.TextAttributes.nodeWidth(selection.endNode) -
                   selection.endOffset);
  var node = selection.endNode;

  if (node.nodeName != 'X-ROW') {
    // If the selection doesn't end on an x-row node, then it must be
    // somewhere inside the x-row.  Add any characters from following siblings
    // into the end offset.

    if (node.nodeName == '#text' && node.parentNode.nodeName == 'SPAN') {
      // If node is the text node in a styled span, move up to the span node.
      node = node.parentNode;
    }

    while (node.nextSibling) {
      node = node.nextSibling;
      endOffset += hterm.TextAttributes.nodeWidth(node);
    }
  }

  var rv = this.getRowsText(selection.startRow.rowIndex,
                            selection.endRow.rowIndex + 1);
  return lib.wc.substring(rv, startOffset, lib.wc.strWidth(rv) - endOffset);
};

/**
 * Copy the current selection to the system clipboard, then clear it after a
 * short delay.
 */
hterm.Terminal.prototype.copySelectionToClipboard = function() {
  var text = this.getSelectionText();
  if (text != null)
    this.copyStringToClipboard(text);
};

hterm.Terminal.prototype.overlaySize = function() {
  this.showOverlay(this.screenSize.width + 'x' + this.screenSize.height);
};

/**
 * Invoked by hterm.Terminal.Keyboard when a VT keystroke is detected.
 *
 * @param {string} string The VT string representing the keystroke, in UTF-16.
 */
hterm.Terminal.prototype.onVTKeystroke = function(string) {
  if (this.scrollOnKeystroke_)
    this.scrollPort_.scrollRowToBottom(this.getRowCount());

  this.io.onVTKeystroke(this.keyboard.encode(string));
};

/**
 * Add the terminalRow and terminalColumn properties to mouse events and
 * then forward on to onMouse().
 *
 * The terminalRow and terminalColumn properties contain the (row, column)
 * coordinates for the mouse event.
 */
hterm.Terminal.prototype.onMouse_ = function(e) {
  if (e.processedByTerminalHandler_) {
    // We register our event handlers on the document, as well as the cursor
    // and the scroll blocker.  Mouse events that occur on the cursor or
    // scroll blocker will also appear on the document, but we don't want to
    // process them twice.
    //
    // We can't just prevent bubbling because that has other side effects, so
    // we decorate the event object with this property instead.
    return;
  }

  e.processedByTerminalHandler_ = true;

  if (e.type == 'mousedown' && e.terminalColumn > this.screenSize.width) {
    // Mousedown in the scrollbar area.
    return;
  }

  e.terminalRow = parseInt((e.clientY - this.scrollPort_.visibleRowTopMargin) /
                           this.scrollPort_.characterSize.height) + 1;
  e.terminalColumn = parseInt(e.clientX /
                              this.scrollPort_.characterSize.width) + 1;

  if (e.type == 'mousedown') {
    if (e.altKey || this.vt.mouseReport == this.vt.MOUSE_REPORT_DISABLED) {
      // If VT mouse reporting is disabled, or has been defeated with
      // alt-mousedown, then the mouse will act on the local selection.
      this.reportMouseEvents_ = false;
      this.setSelectionEnabled(true);
    } else {
      // Otherwise we defer ownership of the mouse to the VT.
      this.reportMouseEvents_ = true;
      this.document_.getSelection().collapse();
      this.setSelectionEnabled(false);
      e.preventDefault();
    }
  }

  if (!this.reportMouseEvents_) {
    if (e.type == 'dblclick') {
      this.screen_.expandSelection(this.document_.getSelection());
      hterm.copySelectionToClipboard(this.document_);
    }

    if (e.type == 'mousedown' && e.which == this.mousePasteButton)
      this.paste();

    if (e.type == 'mouseup' && e.which == 1 && this.copyOnSelect &&
        !this.document_.getSelection().isCollapsed) {
      hterm.copySelectionToClipboard(this.document_);
    }

    if ((e.type == 'mousemove' || e.type == 'mouseup') &&
        this.scrollBlockerNode_.engaged) {
      // Disengage the scroll-blocker after one of these events.
      this.scrollBlockerNode_.engaged = false;
      this.scrollBlockerNode_.style.top = '-99px';
    }

  } else /* if (this.reportMouseEvents) */ {
    if (!this.scrollBlockerNode_.engaged) {
      if (e.type == 'mousedown') {
        // Move the scroll-blocker into place if we want to keep the scrollport
        // from scrolling.
        this.scrollBlockerNode_.engaged = true;
        this.scrollBlockerNode_.style.top = (e.clientY - 5) + 'px';
        this.scrollBlockerNode_.style.left = (e.clientX - 5) + 'px';
      } else if (e.type == 'mousemove') {
        // Oh.  This means that drag-scroll was disabled AFTER the mouse down,
        // in which case it's too late to engage the scroll-blocker.
        this.document_.getSelection().collapse();
        e.preventDefault();
      }
    }

    this.onMouse(e);
  }

  if (e.type == 'mouseup' && this.document_.getSelection().isCollapsed) {
    // Restore this on mouseup in case it was temporarily defeated with a
    // alt-mousedown.  Only do this when the selection is empty so that
    // we don't immediately kill the users selection.
    this.reportMouseEvents_ = (this.vt.mouseReport !=
                               this.vt.MOUSE_REPORT_DISABLED);
  }
};

/**
 * Clients should override this if they care to know about mouse events.
 *
 * The event parameter will be a normal DOM mouse click event with additional
 * 'terminalRow' and 'terminalColumn' properties.
 */
hterm.Terminal.prototype.onMouse = function(e) { };

/**
 * React when focus changes.
 */
hterm.Terminal.prototype.onFocusChange_ = function(state) {
  this.cursorNode_.setAttribute('focus', state ? 'true' : 'false');
  this.restyleCursor_();
};

/**
 * React when the ScrollPort is scrolled.
 */
hterm.Terminal.prototype.onScroll_ = function() {
  this.scheduleSyncCursorPosition_();
};

/**
 * React when text is pasted into the scrollPort.
 */
hterm.Terminal.prototype.onPaste_ = function(e) {
  this.onVTKeystroke(e.text.replace(/\n/mg, '\r'));
};

/**
 * React when the user tries to copy from the scrollPort.
 */
hterm.Terminal.prototype.onCopy_ = function(e) {
  e.preventDefault();
  setTimeout(this.copySelectionToClipboard.bind(this), 0);
};

/**
 * React when the ScrollPort is resized.
 *
 * Note: This function should not directly contain code that alters the internal
 * state of the terminal.  That kind of code belongs in realizeWidth or
 * realizeHeight, so that it can be executed synchronously in the case of a
 * programmatic width change.
 */
hterm.Terminal.prototype.onResize_ = function() {
  var columnCount = Math.floor(this.scrollPort_.getScreenWidth() /
                               this.scrollPort_.characterSize.width);
  var rowCount = Math.floor(this.scrollPort_.getScreenHeight() /
                            this.scrollPort_.characterSize.height);

  if (columnCount <= 0 || rowCount <= 0) {
    // We avoid these situations since they happen sometimes when the terminal
    // gets removed from the document or during the initial load, and we can't
    // deal with that.
    return;
  }

  var isNewSize = (columnCount != this.screenSize.width ||
                   rowCount != this.screenSize.height);

  // We do this even if the size didn't change, just to be sure everything is
  // in sync.
  this.realizeSize_(columnCount, rowCount);
  this.showZoomWarning_(this.scrollPort_.characterSize.zoomFactor != 1);

  if (isNewSize)
    this.overlaySize();

  this.restyleCursor_();
  this.scheduleSyncCursorPosition_();
};

/**
 * Service the cursor blink timeout.
 */
hterm.Terminal.prototype.onCursorBlink_ = function() {
  if (this.cursorNode_.getAttribute('focus') == 'false' ||
      this.cursorNode_.style.opacity == '0') {
    this.cursorNode_.style.opacity = '1';
  } else {
    this.cursorNode_.style.opacity = '0';
  }
};

/**
 * Set the scrollbar-visible mode bit.
 *
 * If scrollbar-visible is on, the vertical scrollbar will be visible.
 * Otherwise it will not.
 *
 * Defaults to on.
 *
 * @param {boolean} state True to set scrollbar-visible mode, false to unset.
 */
hterm.Terminal.prototype.setScrollbarVisible = function(state) {
  this.scrollPort_.setScrollbarVisible(state);
};
// SOURCE FILE: hterm/js/hterm_terminal_io.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.encodeUTF8');

/**
 * Input/Output interface used by commands to communicate with the terminal.
 *
 * Commands like `nassh` and `crosh` receive an instance of this class as
 * part of their argv object.  This allows them to write to and read from the
 * terminal without exposing them to an entire hterm.Terminal instance.
 *
 * The active command must override the onVTKeystroke() and sendString() methods
 * of this class in order to receive keystrokes and send output to the correct
 * destination.
 *
 * Isolating commands from the terminal provides the following benefits:
 * - Provides a mechanism to save and restore onVTKeystroke and sendString
 *   handlers when invoking subcommands (see the push() and pop() methods).
 * - The isolation makes it easier to make changes in Terminal and supporting
 *   classes without affecting commands.
 * - In The Future commands may run in web workers where they would only be able
 *   to talk to a Terminal instance through an IPC mechanism.
 *
 * @param {hterm.Terminal}
 */
hterm.Terminal.IO = function(terminal) {
  this.terminal_ = terminal;

  // The IO object to restore on IO.pop().
  this.previousIO_ = null;
};

/**
 * Show the terminal overlay for a given amount of time.
 *
 * The terminal overlay appears in inverse video in a large font, centered
 * over the terminal.  You should probably keep the overlay message brief,
 * since it's in a large font and you probably aren't going to check the size
 * of the terminal first.
 *
 * @param {string} msg The text (not HTML) message to display in the overlay.
 * @param {number} opt_timeout The amount of time to wait before fading out
 *     the overlay.  Defaults to 1.5 seconds.  Pass null to have the overlay
 *     stay up forever (or until the next overlay).
 */
hterm.Terminal.IO.prototype.showOverlay = function(message, opt_timeout) {
  this.terminal_.showOverlay(message, opt_timeout);
};

/**
 * Open an frame in the current terminal window, pointed to the specified
 * url.
 *
 * Eventually we'll probably need size/position/decoration options.
 * The user should also be able to move/resize the frame.
 *
 * @param {string} url The URL to load in the frame.
 * @param {Object} opt_options Optional frame options.  Not implemented.
 */
hterm.Terminal.IO.prototype.createFrame = function(url, opt_options) {
  return new hterm.Frame(this.terminal_, url, opt_options);
};

/**
 * Change the preference profile for the terminal.
 *
 * @param profileName {string} The name of the preference profile to activate.
 */
hterm.Terminal.IO.prototype.setTerminalProfile = function(profileName) {
  this.terminal_.setProfile(profileName);
};

/**
 * Create a new hterm.Terminal.IO instance and make it active on the Terminal
 * object associated with this instance.
 *
 * This is used to pass control of the terminal IO off to a subcommand.  The
 * IO.pop() method can be used to restore control when the subcommand completes.
 */
hterm.Terminal.IO.prototype.push = function() {
  var io = new hterm.Terminal.IO(this.terminal_);
  io.keyboardCaptured_ = this.keyboardCaptured_;

  io.columnCount = this.columnCount;
  io.rowCount = this.rowCount;

  io.previousIO_ = this.terminal_.io;
  this.terminal_.io = io;

  return io;
};

/**
 * Restore the Terminal's previous IO object.
 */
hterm.Terminal.IO.prototype.pop = function() {
  this.terminal_.io = this.previousIO_;
};

/**
 * Called when data needs to be sent to the current command.
 *
 * Clients should override this to receive notification of pending data.
 *
 * @param {string} string The data to send.
 */
hterm.Terminal.IO.prototype.sendString = function(string) {
  // Override this.
  console.log('Unhandled sendString: ' + string);
};

/**
 * Called when a terminal keystroke is detected.
 *
 * Clients should override this to receive notification of keystrokes.
 *
 * The keystroke data will be encoded according to the 'send-encoding'
 * preference.
 *
 * @param {string} string The VT key sequence.
 */
hterm.Terminal.IO.prototype.onVTKeystroke = function(string) {
  // Override this.
  console.log('Unobserverd VT keystroke: ' + JSON.stringify(string));
};

hterm.Terminal.IO.prototype.onTerminalResize_ = function(width, height) {
  var obj = this;
  while (obj) {
    obj.columnCount = width;
    obj.rowCount = height;
    obj = obj.previousIO_;
  }

  this.onTerminalResize(width, height);
};

/**
 * Called when terminal size is changed.
 *
 * Clients should override this to receive notification of resize.
 *
 * @param {string|integer} terminal width.
 * @param {string|integer} terminal height.
 */
hterm.Terminal.IO.prototype.onTerminalResize = function(width, height) {
  // Override this.
};

/**
 * Write a UTF-8 encoded byte string to the terminal.
 *
 * @param {string} string The UTF-8 encoded string to print.
 */
hterm.Terminal.IO.prototype.writeUTF8 = function(string) {
  if (this.terminal_.io != this)
    throw 'Attempt to print from inactive IO object.';

  this.terminal_.interpret(string);
};

/**
 * Write a UTF-8 encoded byte string to the terminal followed by crlf.
 *
 * @param {string} string The UTF-8 encoded string to print.
 */
hterm.Terminal.IO.prototype.writelnUTF8 = function(string) {
  if (this.terminal_.io != this)
    throw 'Attempt to print from inactive IO object.';

  this.terminal_.interpret(string + '\r\n');
};

/**
 * Write a UTF-16 JavaScript string to the terminal.
 *
 * @param {string} string The string to print.
 */
hterm.Terminal.IO.prototype.print =
hterm.Terminal.IO.prototype.writeUTF16 = function(string) {
  this.writeUTF8(lib.encodeUTF8(string));
};

/**
 * Print a UTF-16 JavaScript string to the terminal followed by a newline.
 *
 * @param {string} string The string to print.
 */
hterm.Terminal.IO.prototype.println =
hterm.Terminal.IO.prototype.writelnUTF16 = function(string) {
  this.writelnUTF8(lib.encodeUTF8(string));
};
// SOURCE FILE: hterm/js/hterm_text_attributes.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.colors');

/**
 * Constructor for TextAttribute objects.
 *
 * These objects manage a set of text attributes such as foreground/
 * background color, bold, italic, blink and underline.
 *
 * TextAttribute instances can be used to construct a DOM container implementing
 * the current attributes, or to test an existing DOM container for
 * compatibility with the current attributes.
 *
 * @constructor
 * @param {HTMLDocument} document The parent document to use when creating
 *     new DOM containers.
 */
hterm.TextAttributes = function(document) {
  this.document_ = document;
  this.foregroundIndex = null;
  this.backgroundIndex = null;

  // These properties cache the value in the color table, but foregroundIndex
  // and backgroundIndex contain the canonical values.
  this.foreground = this.DEFAULT_COLOR;
  this.background = this.DEFAULT_COLOR;

  this.defaultForeground = 'rgb(255, 255, 255)';
  this.defaultBackground = 'rgb(0, 0, 0)';

  this.bold = false;
  this.blink = false;
  this.underline = false;
  this.inverse = false;
  this.invisible = false;
  this.wcNode = false;

  this.colorPalette = null;
  this.resetColorPalette();
};

/**
 * If false, we ignore the bold attribute.
 *
 * This is used for fonts that have a bold version that is a different size
 * than the normal weight version.
 */
hterm.TextAttributes.prototype.enableBold = true;

/**
 * If true, use bright colors (if available) for bold text.
 *
 * This setting is independent of the enableBold setting.
 */
hterm.TextAttributes.prototype.enableBoldAsBright = true;

/**
 * A sentinel constant meaning "whatever the default color is in this context".
 */
hterm.TextAttributes.prototype.DEFAULT_COLOR = new String('');

/**
 * The document object which should own the DOM nodes created by this instance.
 *
 * @param {HTMLDocument} document The parent document.
 */
hterm.TextAttributes.prototype.setDocument = function(document) {
  this.document_ = document;
};

/**
 * Create a deep copy of this object.
 *
 * @return {hterm.TextAttributes} A deep copy of this object.
 */
hterm.TextAttributes.prototype.clone = function() {
  var rv = new hterm.TextAttributes(null);

  for (var key in this) {
    rv[key] = this[key];
  }

  rv.colorPalette = this.colorPalette.concat();
  return rv;
};

/**
 * Reset the current set of attributes.
 *
 * This does not affect the palette.  Use resetColorPalette() for that.
 */
hterm.TextAttributes.prototype.reset = function() {
  this.foregroundIndex = null;
  this.backgroundIndex = null;
  this.foreground = this.DEFAULT_COLOR;
  this.background = this.DEFAULT_COLOR;
  this.bold = false;
  this.blink = false;
  this.underline = false;
  this.inverse = false;
  this.invisible = false;
  this.wcNode = false;
};

/**
 * Reset the color palette to the default state.
 */
hterm.TextAttributes.prototype.resetColorPalette = function() {
  this.colorPalette = lib.colors.colorPalette.concat();
  this.syncColors();
};

/**
 * Test if the current attributes describe unstyled text.
 *
 * @return {boolean} True if the current attributes describe unstyled text.
 */
hterm.TextAttributes.prototype.isDefault = function() {
  return (this.foregroundIndex == null &&
          this.backgroundIndex == null &&
          !this.bold &&
          !this.blink &&
          !this.underline &&
          !this.inverse &&
          !this.invisible &&
          !this.wcNode);
};

/**
 * Create a DOM container (a span or a text node) with a style to match the
 * current set of attributes.
 *
 * This method will create a plain text node if the text is unstyled, or
 * an HTML span if the text is styled.  Due to lack of monospace wide character
 * fonts on certain systems (e.g. Chrome OS), we need to put each wide character
 * in a span of CSS class '.wc-node' which has double column width.
 *
 * @param {string} opt_textContent Optional text content for the new container.
 * @return {HTMLNode} An HTML span or text nodes styled to match the current
 *     attributes.
 */
hterm.TextAttributes.prototype.createContainer = function(opt_textContent) {
  if (this.isDefault())
    return this.document_.createTextNode(opt_textContent);

  var span = this.document_.createElement('span');
  var style = span.style;

  if (this.foreground != this.DEFAULT_COLOR)
    style.color = this.foreground;

  if (this.background != this.DEFAULT_COLOR) {
    style.backgroundColor = this.background;
    // This bottom border ensures that the extra row of pixels at the bottom of
    // the character cell (used to hold underscores in some fonts) has the
    // correct background color.
    style.borderBottom = '1px ' + this.background + ' solid';
  }

  if (this.enableBold && this.bold)
    style.fontWeight = 'bold';

  if (this.blink)
    style.fontStyle = 'italic';

  if (this.underline)
    style.textDecoration = 'underline';

  if (this.wcNode) {
    span.className = 'wc-node';
    span.wcNode = true;
  }

  if (opt_textContent)
    span.textContent = opt_textContent;

  return span;
};

/**
 * Tests if the provided object (string, span or text node) has the same
 * style as this TextAttributes instance.
 *
 * This indicates that text with these attributes could be inserted directly
 * into the target DOM node.
 *
 * For the purposes of this method, a string is considered a text node.
 *
 * @param {string|HTMLNode} obj The object to test.
 * @return {boolean} True if the provided container has the same style as
 *     this attributes instance.
 */
hterm.TextAttributes.prototype.matchesContainer = function(obj) {
  if (typeof obj == 'string' || obj.nodeType == 3)
    return this.isDefault();

  var style = obj.style;

  // We don't want to put multiple wide characters in a wcNode. See the comment
  // in createContainer.
  return (!(this.wcNode || obj.wcNode) &&
          this.foreground == style.color &&
          this.background == style.backgroundColor &&
          (this.enableBold && this.bold) == !!style.fontWeight &&
          this.blink == !!style.fontStyle &&
          this.underline == !!style.textDecoration);
};

hterm.TextAttributes.prototype.setDefaults = function(foreground, background) {
  this.defaultForeground = foreground;
  this.defaultBackground = background;

  this.syncColors();
};

/**
 * Updates foreground and background properties based on current indices and
 * other state.
 *
 * @param {string} terminalForeground The terminal foreground color for use as
 *     inverse text background.
 * @param {string} terminalBackground The terminal background color for use as
 *     inverse text foreground.
 *
 */
hterm.TextAttributes.prototype.syncColors = function() {
  function getBrightIndex(i) {
    if (i < 8) {
      // If the color is from the lower half of the ANSI 16, add 8.
      return i + 8;
    }

    // If it's not from the 16 color palette, ignore bold requests.  This
    // matches the behavior of gnome-terminal.
    return i;
  }

  var foregroundIndex = this.foregroundIndex;
  var backgroundIndex = this.backgroundIndex;
  var defaultForeground = this.DEFAULT_COLOR;
  var defaultBackground = this.DEFAULT_COLOR;

  if (this.inverse) {
    foregroundIndex = this.backgroundIndex;
    backgroundIndex = this.foregroundIndex;
    // We can't inherit the container's color anymore.
    defaultForeground = this.defaultBackground;
    defaultBackground = this.defaultForeground;
  }

  if (this.enableBoldAsBright && this.bold) {
    if (foregroundIndex != null)
      foregroundIndex = getBrightIndex(foregroundIndex);
  }

  if (this.invisible)
    foregroundIndex = backgroundIndex;

  this.foreground = ((foregroundIndex == null) ? defaultForeground :
                     this.colorPalette[foregroundIndex]);
  this.background = ((backgroundIndex == null) ? defaultBackground :
                     this.colorPalette[backgroundIndex]);
};

/**
 * Static method used to test if the provided objects (strings, spans or
 * text nodes) have the same style.
 *
 * For the purposes of this method, a string is considered a text node.
 *
 * @param {string|HTMLNode} obj1 An object to test.
 * @param {string|HTMLNode} obj2 Another object to test.
 * @return {boolean} True if the containers have the same style.
 */
hterm.TextAttributes.containersMatch = function(obj1, obj2) {
  if (typeof obj1 == 'string')
    return hterm.TextAttributes.containerIsDefault(obj2);

  if (obj1.nodeType != obj2.nodeType)
    return false;

  if (obj1.nodeType == 3)
    return true;

  var style1 = obj1.style;
  var style2 = obj2.style;

  return (style1.color == style2.color &&
          style1.backgroundColor == style2.backgroundColor &&
          style1.fontWeight == style2.fontWeight &&
          style1.fontStyle == style2.fontStyle &&
          style1.textDecoration == style2.textDecoration);
};

/**
 * Static method to test if a given DOM container represents unstyled text.
 *
 * For the purposes of this method, a string is considered a text node.
 *
 * @param {string|HTMLNode} obj1 An object to test.
 * @return {boolean} True if the object is unstyled.
 */
hterm.TextAttributes.containerIsDefault = function(obj) {
  return typeof obj == 'string'  || obj.nodeType == 3;
};

/**
 * Static method to get the column width of a node's textContent.
 *
 * @param {HTMLElement} node The HTML element to get the width of textContent
 *     from.
 * @return {integer} The column width of the node's textContent.
 */
hterm.TextAttributes.nodeWidth = function(node) {
  if (node.wcNode) {
    return lib.wc.strWidth(node.textContent);
  } else {
    return node.textContent.length;
  }
}

/**
 * Static method to get the substr of a node's textContent.  The start index
 * and substr width are computed in column width.
 *
 * @param {HTMLElement} node The HTML element to get the substr of textContent
 *     from.
 * @param {integer} start The starting offset in column width.
 * @param {integer} width The width to capture in column width.
 * @return {integer} The extracted substr of the node's textContent.
 */
hterm.TextAttributes.nodeSubstr = function(node, start, width) {
  if (node.wcNode) {
    return lib.wc.substr(node.textContent, start, width);
  } else {
    return node.textContent.substr(start, width);
  }
}

/**
 * Static method to get the substring based of a node's textContent.  The
 * start index of end index are computed in column width.
 *
 * @param {HTMLElement} node The HTML element to get the substr of textContent
 *     from.
 * @param {integer} start The starting offset in column width.
 * @param {integer} end The ending offset in column width.
 * @return {integer} The extracted substring of the node's textContent.
 */
hterm.TextAttributes.nodeSubstring = function(node, start, end) {
  if (node.wcNode) {
    return lib.wc.substring(node.textContent, start, end);
  } else {
    return node.textContent.substring(start, end);
  }
}

/**
 * Static method to split a string into contiguous runs of single-width
 * characters and runs of double-width characters.
 *
 * @param {string} str The string to split.
 * @return {Array} An array of objects that contain substrings of str, where
 *     each substring is either a contiguous runs of single-width characters
 *     or a double-width character.  For object that contains a double-width
 *     character, its wcNode property is set to true.
 */
hterm.TextAttributes.splitWidecharString = function(str) {
  var rv = [];
  var base = 0, length = 0;

  for (var i = 0; i < str.length; i++) {
    var c = str.charCodeAt(i);
    if (c < 128 || lib.wc.charWidth(c) == 1) {
      length++;
    } else {
      if (length) {
        rv.push({str: str.substr(base, length)});
      }
      rv.push({str: str.substr(i, 1), wcNode: true});
      base = i + 1;
      length = 0;
    }
  }

  if (length)
    rv.push({str: str.substr(base, length)});

  return rv;
}
// SOURCE FILE: hterm/js/hterm_vt.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.colors', 'lib.f', 'lib.UTF8Decoder',
          'hterm.VT.CharacterMap');

/**
 * Constructor for the VT escape sequence interpreter.
 *
 * The interpreter operates on a terminal object capable of performing cursor
 * move operations, painting characters, etc.
 *
 * This interpreter is intended to be compatible with xterm, though it
 * ignores some of the more esoteric escape sequences.
 *
 * Some sequences are marked "Will not implement", meaning that they aren't
 * considered relevant to hterm and will probably never be implemented.
 *
 * Others are marked "Not currently implemented", meaning that they are lower
 * priority items that may be useful to implement at some point.
 *
 * See also:
 *   [VT100] VT100 User Guide
 *           http://vt100.net/docs/vt100-ug/chapter3.html
 *   [VT510] VT510 Video Terminal Programmer Information
 *           http://vt100.net/docs/vt510-rm/contents
 *   [XTERM] Xterm Control Sequences
 *           http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
 *   [CTRL]  Wikipedia: C0 and C1 Control Codes
 *           http://en.wikipedia.org/wiki/C0_and_C1_control_codes
 *   [CSI]   Wikipedia: ANSI Escape Code
 *           http://en.wikipedia.org/wiki/Control_Sequence_Introducer
 *   man 5 terminfo, man infocmp, infocmp -L xterm-new
 *
 * @param {hterm.Terminal} terminal Terminal to use with the interpreter.
 */
hterm.VT = function(terminal) {
  /**
   * The display terminal object associated with this virtual terminal.
   */
  this.terminal = terminal;

  terminal.onMouse = this.onTerminalMouse_.bind(this);
  this.mouseReport = this.MOUSE_REPORT_DISABLED;

  // Parse state left over from the last parse.  You should use the parseState
  // instance passed into your parse routine, rather than reading
  // this.parseState_ directly.
  this.parseState_ = new hterm.VT.ParseState(this.parseUnknown_);

  // Any "leading modifiers" for the escape sequence, such as '?', ' ', or the
  // other modifiers handled in this.parseCSI_.
  this.leadingModifier_ = '';

  // Any "trailing modifiers".  Same character set as a leading modifier,
  // except these are found after the numeric arguments.
  this.trailingModifier_ = '';

  // Whether or not to respect the escape codes for setting terminal width.
  this.allowColumnWidthChanges_ = false;

  // The amount of time we're willing to wait for the end of an OSC sequence.
  this.oscTimeLimit_ = 20000;

  // Construct a regular expression to match the known one-byte control chars.
  // This is used in parseUnknown_ to quickly scan a string for the next
  // control character.
  var cc1 = Object.keys(hterm.VT.CC1).map(
      function(e) {
        return '\\x' + lib.f.zpad(e.charCodeAt().toString(16), 2)
      }).join('');
  this.cc1Pattern_ = new RegExp('[' + cc1 + ']');

  // Decoder to maintain UTF-8 decode state.
  this.utf8Decoder_ = new lib.UTF8Decoder();

  /**
   * Whether to accept the 8-bit control characters.
   *
   * An 8-bit control character is one with the eighth bit set.  These
   * didn't work on 7-bit terminals so they all have two byte equivalents.
   * Most hosts still only use the two-byte versions.
   *
   * We ignore 8-bit control codes by default.  This is in order to avoid
   * issues with "accidental" usage of codes that need to be terminated.
   * The "accident" usually involves cat'ing binary data.
   */
  this.enable8BitControl = false;

  /**
   * Whether to allow the OSC 52 sequence to write to the system clipboard.
   */
  this.enableClipboardWrite = true;

  /**
   * Respect the host's attempt to change the cursor blink status using
   * the DEC Private mode 12.
   */
  this.enableDec12 = false;

  /**
   * The expected encoding method for data received from the host.
   */
  this.characterEncoding = 'utf-8';

  /**
   * Max length of an unterminated DCS, OSC, PM or APC sequence before we give
   * up and ignore the code.
   *
   * These all end with a String Terminator (ST, '\x9c', ESC '\\') or
   * (BEL, '\x07') character, hence the "string sequence" moniker.
   */
  this.maxStringSequence = 1024;

  /**
   * If true, emit warnings when we encounter a control character or escape
   * sequence that we don't recognize or explicitly ignore.
   */
  this.warnUnimplemented = true;

  /**
   * The default G0...G3 character maps.
   */
  this.G0 = hterm.VT.CharacterMap.maps['B'];
  this.G1 = hterm.VT.CharacterMap.maps['0'];
  this.G2 = hterm.VT.CharacterMap.maps['B'];
  this.G3 = hterm.VT.CharacterMap.maps['B'];

  /**
   * The 7-bit visible character set.
   *
   * This is a mapping from inbound data to display glyph.  The GL set
   * contains the 94 bytes from 0x21 to 0x7e.
   *
   * The default GL set is 'B', US ASCII.
   */
  this.GL = 'G0';

  /**
   * The 8-bit visible character set.
   *
   * This is a mapping from inbound data to display glyph.  The GR set
   * contains the 94 bytes from 0xa1 to 0xfe.
   */
  this.GR = 'G0';

  // Saved state used in DECSC.
  //
  // This is a place to store a copy VT state, it is *not* the active state.
  this.savedState_ = new hterm.VT.CursorState(this);
};

/**
 * No mouse events.
 */
hterm.VT.prototype.MOUSE_REPORT_DISABLED = 0;

/**
 * DECSET mode 1000.
 *
 * Report mouse down/up events only.
 */
hterm.VT.prototype.MOUSE_REPORT_CLICK = 1;

/**
 * DECSET mode 1002.
 *
 * Report mouse down/up and movement while a button is down.
 */
hterm.VT.prototype.MOUSE_REPORT_DRAG = 3;

/**
 * ParseState constructor.
 *
 * This object tracks the current state of the parse.  It has fields for the
 * current buffer, position in the buffer, and the parse function.
 *
 * @param {function} defaultFunc The default parser function.
 * @param {string} opt_buf Optional string to use as the current buffer.
 */
hterm.VT.ParseState = function(defaultFunction, opt_buf) {
  this.defaultFunction = defaultFunction;
  this.buf = opt_buf || null;
  this.pos = 0;
  this.func = defaultFunction;
  this.args = [];
};

/**
 * Reset the parser function, buffer, and position.
 */
hterm.VT.ParseState.prototype.reset = function(opt_buf) {
  this.resetParseFunction();
  this.resetBuf(opt_buf || '');
  this.resetArguments();
};

/**
 * Reset the parser function only.
 */
hterm.VT.ParseState.prototype.resetParseFunction = function() {
  this.func = this.defaultFunction;
};

/**
 * Reset the buffer and position only.
 *
 * @param {string} buf Optional new value for buf, defaults to null.
 */
hterm.VT.ParseState.prototype.resetBuf = function(opt_buf) {
  this.buf = (typeof opt_buf == 'string') ? opt_buf : null;
  this.pos = 0;
};

/**
 * Reset the arguments list only.
 *
 * @param {string} opt_arg_zero Optional initial value for args[0].
 */
hterm.VT.ParseState.prototype.resetArguments = function(opt_arg_zero) {
  this.args.length = 0;
  if (typeof opt_arg_zero != 'undefined')
    this.args[0] = opt_arg_zero;
};

/**
 * Get an argument as an integer.
 *
 * @param {number} argnum The argument number to retreive.
 */
hterm.VT.ParseState.prototype.iarg = function(argnum, defaultValue) {
  var str = this.args[argnum];
  if (str) {
    var ret = parseInt(str, 10);
    // An argument of zero is treated as the default value.
    if (ret == 0)
      ret = defaultValue;
    return ret;
  }
  return defaultValue;
};

/**
 * Advance the parse postion.
 *
 * @param {integer} count The number of bytes to advance.
 */
hterm.VT.ParseState.prototype.advance = function(count) {
  this.pos += count;
};

/**
 * Return the remaining portion of the buffer without affecting the parse
 * position.
 *
 * @return {string} The remaining portion of the buffer.
 */
hterm.VT.ParseState.prototype.peekRemainingBuf = function() {
  return this.buf.substr(this.pos);
};

/**
 * Return the next single character in the buffer without affecting the parse
 * position.
 *
 * @return {string} The next character in the buffer.
 */
hterm.VT.ParseState.prototype.peekChar = function() {
  return this.buf.substr(this.pos, 1);
};

/**
 * Return the next single character in the buffer and advance the parse
 * position one byte.
 *
 * @return {string} The next character in the buffer.
 */
hterm.VT.ParseState.prototype.consumeChar = function() {
  return this.buf.substr(this.pos++, 1);
};

/**
 * Return true if the buffer is empty, or the position is past the end.
 */
hterm.VT.ParseState.prototype.isComplete = function() {
  return this.buf == null || this.buf.length <= this.pos;
};

hterm.VT.CursorState = function(vt) {
  this.vt_ = vt;
  this.save();
};

hterm.VT.CursorState.prototype.save = function() {
  this.cursor = this.vt_.terminal.saveCursor();

  this.textAttributes = this.vt_.terminal.getTextAttributes().clone();

  this.GL = this.vt_.GL;
  this.GR = this.vt_.GR;

  this.G0 = this.vt_.G0;
  this.G1 = this.vt_.G1;
  this.G2 = this.vt_.G2;
  this.G3 = this.vt_.G3;
};

hterm.VT.CursorState.prototype.restore = function() {
  this.vt_.terminal.restoreCursor(this.cursor);

  this.vt_.terminal.setTextAttributes(this.textAttributes.clone());

  this.vt_.GL = this.GL;
  this.vt_.GR = this.GR;

  this.vt_.G0 = this.G0;
  this.vt_.G1 = this.G1;
  this.vt_.G2 = this.G2;
  this.vt_.G3 = this.G3;
};

hterm.VT.prototype.reset = function() {
  this.G0 = hterm.VT.CharacterMap.maps['B'];
  this.G1 = hterm.VT.CharacterMap.maps['0'];
  this.G2 = hterm.VT.CharacterMap.maps['B'];
  this.G3 = hterm.VT.CharacterMap.maps['B'];

  this.GL = 'G0';
  this.GR = 'G0';

  this.savedState_ = new hterm.VT.CursorState(this);

  this.mouseReport = this.MOUSE_REPORT_DISABLED;
};

/**
 * Handle terminal mouse events.
 *
 * See the "Mouse Tracking" section of [xterm].
 */
hterm.VT.prototype.onTerminalMouse_ = function(e) {
  if (this.mouseReport == this.MOUSE_REPORT_DISABLED)
    return;

  // Temporary storage for our response.
  var response;

  // Modifier key state.
  var mod = 0;
  if (e.shiftKey)
    mod |= 4;
  if (e.metaKey || (this.terminal.keyboard.altIsMeta && e.altKey))
    mod |= 8;
  if (e.ctrlKey)
    mod |= 16;

  // TODO(rginda): We should also support mode 1005 and/or 1006 to extend the
  // coordinate space.  Though, after poking around just a little, I wasn't
  // able to get vi or emacs to use either of these modes.
  var x = String.fromCharCode(lib.f.clamp(e.terminalColumn + 32, 32, 255));
  var y = String.fromCharCode(lib.f.clamp(e.terminalRow + 32, 32, 255));

  switch (e.type) {
    case 'mousewheel':
      // Mouse wheel is treated as button 1 or 2 plus an additional 64.
      b = ((e.wheelDeltaY > 0) ? 0 : 1) + 96;
      b |= mod;
      response = '\x1b[M' + String.fromCharCode(b) + x + y;

      // Keep the terminal from scrolling.
      e.preventDefault();
      break;

    case 'mousedown':
      // Buttons are encoded as button number plus 32.
      var b = Math.min(e.which - 1, 2) + 32;

      // And mix in the modifier keys.
      b |= mod;

      response = '\x1b[M' + String.fromCharCode(b) + x + y;
      break;

    case 'mouseup':
      // Mouse up has no indication of which button was released.
      response = '\x1b[M\x23' + x + y;
      break;

    case 'mousemove':
      if (this.mouseReport == this.MOUSE_REPORT_DRAG && e.which) {
        // Standard button bits.
        b = 32 + Math.min(e.which - 1, 2);

        // Add 32 to indicate mouse motion.
        b += 32;

        // And mix in the modifier keys.
        b |= mod;

        response = '\x1b[M' + String.fromCharCode(b) + x + y;
      }

      break;

    case 'click':
    case 'dblclick':
      break;

    default:
      console.error('Unknown mouse event: ' + e.type, e);
      break;
  }

  if (response)
    this.terminal.io.sendString(response);
};

/**
 * Interpret a string of characters, displaying the results on the associated
 * terminal object.
 *
 * The buffer will be decoded according to the 'receive-encoding' preference.
 */
hterm.VT.prototype.interpret = function(buf) {
  this.parseState_.resetBuf(this.decode(buf));

  while (!this.parseState_.isComplete()) {
    var func = this.parseState_.func;
    var pos = this.parseState_.pos;
    var buf = this.parseState_.buf;

    this.parseState_.func.call(this, this.parseState_);

    if (this.parseState_.func == func && this.parseState_.pos == pos &&
        this.parseState_.buf == buf) {
      throw 'Parser did not alter the state!';
    }
  }
};

/**
 * Decode a string according to the 'receive-encoding' preference.
 */
hterm.VT.prototype.decode = function(str) {
  if (this.characterEncoding == 'utf-8')
    return this.decodeUTF8(str);

  return str;
};

/**
 * Encode a UTF-16 string as UTF-8.
 *
 * See also: http://en.wikipedia.org/wiki/UTF-16
 */
hterm.VT.prototype.encodeUTF8 = function(str) {
  return lib.encodeUTF8(str);
};

/**
 * Decode a UTF-8 string into UTF-16.
 */
hterm.VT.prototype.decodeUTF8 = function(str) {
  return this.utf8Decoder_.decode(str);
};

/**
 * The default parse function.
 *
 * This will scan the string for the first 1-byte control character (C0/C1
 * characters from [CTRL]).  Any plain text coming before the code will be
 * printed to the terminal, then the control character will be dispatched.
 */
hterm.VT.prototype.parseUnknown_ = function(parseState) {
  var self = this;

  function print(str) {
    if (self[self.GL].GL)
      str = self[self.GL].GL(str);

    if (self[self.GR].GR)
      str = self[self.GR].GR(str);

    self.terminal.print(str);
  };

  // Search for the next contiguous block of plain text.
  var buf = parseState.peekRemainingBuf();
  var nextControl = buf.search(this.cc1Pattern_);

  if (nextControl == 0) {
    // We've stumbled right into a control character.
    this.dispatch('CC1', buf.substr(0, 1), parseState);
    parseState.advance(1);
    return;
  }

  if (nextControl == -1) {
    // There are no control characters in this string.
    print(buf);
    parseState.reset();
    return;
  }

  print(buf.substr(0, nextControl));
  this.dispatch('CC1', buf.substr(nextControl, 1), parseState);
  parseState.advance(nextControl + 1);
};

/**
 * Parse a Control Sequence Introducer code and dispatch it.
 *
 * See [CSI] for some useful information about these codes.
 */
hterm.VT.prototype.parseCSI_ = function(parseState) {
  var ch = parseState.peekChar();
  var args = parseState.args;

  if (ch >= '@' && ch <= '~') {
    // This is the final character.
    this.dispatch('CSI', this.leadingModifier_ + this.trailingModifier_ + ch,
                  parseState);
    parseState.resetParseFunction();

  } else if (ch == ';') {
    // Parameter delimeter.
    if (this.trailingModifier_) {
      // Parameter delimiter after the trailing modifier.  That's a paddlin'.
      parseState.resetParseFunction();

    } else {
      if (!args.length) {
        // They omitted the first param, we need to supply it.
        args.push('');
      }

      args.push('');
    }

  } else if (ch >= '0' && ch <= '9') {
    // Next byte in the current parameter.

    if (this.trailingModifier_) {
      // Numeric parameter after the trailing modifier.  That's a paddlin'.
      parseState.resetParseFunction();
    } else {
      if (!args.length) {
        args[0] = ch;
      } else {
        args[args.length - 1] += ch;
      }
    }

  } else if (ch >= ' ' && ch <= '?' && ch != ':') {
    // Modifier character.
    if (!args.length) {
      this.leadingModifier_ += ch;
    } else {
      this.trailingModifier_ += ch;
    }

  } else if (this.cc1Pattern_.test(ch)) {
    // Control character.
    this.dispatch('CC1', ch, parseState);

  } else {
    // Unexpected character in sequence, bail out.
    parseState.resetParseFunction();
  }

  parseState.advance(1);
};

/**
 * Skip over the string until the next String Terminator (ST, 'ESC \') or
 * Bell (BEL, '\x07').
 *
 * The string is accumulated in parseState.args[0].  Make sure to reset the
 * arguments (with parseState.resetArguments) before starting the parse.
 *
 * You can detect that parsing in complete by checking that the parse
 * function has changed back to the default parse function.
 *
 * If we encounter more than maxStringSequence characters, we send back
 * the unterminated sequence to be re-parsed with the default parser function.
 *
 * @return {boolean} If true, parsing is ongoing or complete.  If false, we've
 *     exceeded the max string sequence.
 */
hterm.VT.prototype.parseUntilStringTerminator_ = function(parseState) {
  var buf = parseState.peekRemainingBuf();
  var nextTerminator = buf.search(/(\x1b\\|\x07)/);
  var args = parseState.args;

  if (!args.length) {
    args[0] = '';
    args[1] = new Date();
  }

  if (nextTerminator == -1) {
    // No terminator here, have to wait for the next string.

    args[0] += buf;

    var abortReason;

    if (args[0].length > this.maxStringSequence)
      abortReason = 'too long: ' + args[0].length;

    if (args[0].indexOf('\x1b') != -1)
      abortReason = 'embedded escape: ' + args[0].indexOf('\x1b');

    if (new Date() - args[1] > this.oscTimeLimit_)
      abortReason = 'timeout expired: ' + new Date() - args[1];

    if (abortReason) {
      console.log('parseUntilStringTerminator_: aborting: ' + abortReason,
                  args[0]);
      parseState.reset(args[0]);
      return false;
    }

    parseState.advance(buf.length);
    return true;
  }

  if (args[0].length + nextTerminator > this.maxStringSequence) {
    // We found the end of the sequence, but we still think it's too long.
    parseState.reset(args[0] + buf);
    return false;
  }

  args[0] += buf.substr(0, nextTerminator);

  parseState.resetParseFunction();
  parseState.advance(nextTerminator +
                     (buf.substr(nextTerminator, 1) == '\x1b' ? 2 : 1));

  return true;
};

/**
 * Dispatch to the function that handles a given CC1, ESC, or CSI or VT52 code.
 */
hterm.VT.prototype.dispatch = function(type, code, parseState) {
  var handler = hterm.VT[type][code];
  if (!handler) {
    if (this.warnUnimplemented)
      console.warn('Unknown ' + type + ' code: ' + JSON.stringify(code));
    return;
  }

  if (handler == hterm.VT.ignore) {
    if (this.warnUnimplemented)
      console.warn('Ignored ' + type + ' code: ' + JSON.stringify(code));
    return;
  }

  if (type == 'CC1' && code > '\x7f' && !this.enable8BitControl) {
    // It's kind of a hack to put this here, but...
    //
    // If we're dispatching a 'CC1' code, and it's got the eighth bit set,
    // but we're not supposed to handle 8-bit codes?  Just ignore it.
    //
    // This prevents an errant (DCS, '\x90'), (OSC, '\x9d'), (PM, '\x9e') or
    // (APC, '\x9f') from locking up the terminal waiting for its expected
    // (ST, '\x9c') or (BEL, '\x07').
    console.warn('Ignoring 8-bit control code: 0x' +
                 code.charCodeAt(0).toString(16));
    return;
  }

  handler.apply(this, [parseState, code]);
};

/**
 * Set one of the ANSI defined terminal mode bits.
 *
 * Invoked in response to SM/RM.
 *
 * Expected values for code:
 *   2 - Keyboard Action Mode (AM).  Will not implement.
 *   4 - Insert Mode (IRM).
 *   12 - Send/receive (SRM).  Will not implement.
 *   20 - Automatic Newline (LNM).
 *
 * Unexpected and unimplemented values are silently ignored.
 */
hterm.VT.prototype.setANSIMode = function(code, state) {
  if (code == '4') {
    this.terminal.setInsertMode(state);
  } else if (code == '20') {
    this.terminal.setAutoCarriageReturn(state);
  } else if (this.warnUnimplemented) {
    console.warn('Unimplemented ANSI Mode: ' + code);
  }
};

/**
 * Set or reset one of the DEC Private modes.
 *
 * Invoked in response to DECSET/DECRST.
 *
 * Expected values for code:
 *      1 - Application Cursor Keys (DECCKM).
 *      2 - [!] Designate USASCII for character sets G0-G3 (DECANM), and set
 *          VT100 mode.
 *      3 - 132 Column Mode (DECCOLM).
 *      4 - [x] Smooth (Slow) Scroll (DECSCLM).
 *      5 - Reverse Video (DECSCNM).
 *      6 - Origin Mode (DECOM).
 *      7 - Wraparound Mode (DECAWM).
 *      8 - [x] Auto-repeat Keys (DECARM).
 *      9 - [!] Send Mouse X & Y on button press.
 *     10 - [x] Show toolbar (rxvt).
 *     12 - Start Blinking Cursor (att610).
 *     18 - [!] Print form feed (DECPFF).
 *     19 - [x] Set print extent to full screen (DECPEX).
 *     25 - Show Cursor (DECTCEM).
 *     30 - [!] Show scrollbar (rxvt).
 *     35 - [x] Enable font-shifting functions (rxvt).
 *     38 - [x] Enter Tektronix Mode (DECTEK).
 *     40 - Allow 80 - 132 Mode.
 *     41 - [!] more(1) fix (see curses resource).
 *     42 - [!] Enable Nation Replacement Character sets (DECNRCM).
 *     44 - [!] Turn On Margin Bell.
 *     45 - Reverse-wraparound Mode.
 *     46 - [x] Start Logging.
 *     47 - [!] Use Alternate Screen Buffer.
 *     66 - [!] Application keypad (DECNKM).
 *     67 - Backarrow key sends backspace (DECBKM).
 *   1000 - Send Mouse X & Y on button press and release.  (MOUSE_REPORT_CLICK)
 *   1001 - [!] Use Hilite Mouse Tracking.
 *   1002 - Use Cell Motion Mouse Tracking.  (MOUSE_REPORT_DRAG)
 *   1003 - [!] Use All Motion Mouse Tracking.
 *   1004 - [!] Send FocusIn/FocusOut events.
 *   1005 - [!] Enable Extended Mouse Mode.
 *   1010 - Scroll to bottom on tty output (rxvt).
 *   1011 - Scroll to bottom on key press (rxvt).
 *   1034 - [x] Interpret "meta" key, sets eighth bit.
 *   1035 - [x] Enable special modifiers for Alt and NumLock keys.
 *   1036 - Send ESC when Meta modifies a key.
 *   1037 - [!] Send DEL from the editing-keypad Delete key.
 *   1039 - Send ESC when Alt modifies a key.
 *   1040 - [x] Keep selection even if not highlighted.
 *   1041 - [x] Use the CLIPBOARD selection.
 *   1042 - [!] Enable Urgency window manager hint when Control-G is received.
 *   1043 - [!] Enable raising of the window when Control-G is received.
 *   1047 - [!] Use Alternate Screen Buffer.
 *   1048 - Save cursor as in DECSC.
 *   1049 - Save cursor as in DECSC and use Alternate Screen Buffer, clearing
 *          it first. (This may be disabled by the titeInhibit resource). This
 *          combines the effects of the 1047 and 1048 modes. Use this with
 *          terminfo-based applications rather than the 47 mode.
 *   1050 - [!] Set terminfo/termcap function-key mode.
 *   1051 - [x] Set Sun function-key mode.
 *   1052 - [x] Set HP function-key mode.
 *   1053 - [x] Set SCO function-key mode.
 *   1060 - [x] Set legacy keyboard emulation (X11R6).
 *   1061 - [!] Set VT220 keyboard emulation.
 *   2004 - [!] Set bracketed paste mode.
 *
 * [!] - Not currently implemented, may be in the future.
 * [x] - Will not implement.
 */
hterm.VT.prototype.setDECMode = function(code, state) {
  switch (code) {
    case '1':  // DECCKM
      this.terminal.keyboard.applicationCursor = state;
      break;

    case '3':  // DECCOLM
      if (this.allowColumnWidthChanges_) {
        this.terminal.setWidth(state ? 132 : 80);

        this.terminal.clearHome();
        this.terminal.setVTScrollRegion(null, null);
      }
      break;

    case '5':  // DECSCNM
      this.terminal.setReverseVideo(state);
      break;

    case '6':  // DECOM
      this.terminal.setOriginMode(state);
      break;

    case '7':  // DECAWM
      this.terminal.setWraparound(state);
      break;

    case '12':  // att610
      if (this.enableDec12)
        this.terminal.setCursorBlink(state);
      break;

    case '25':  // DECTCEM
      this.terminal.setCursorVisible(state);
      break;

    case '40':  // no-spec
      this.terminal.allowColumnWidthChanges_ = state;
      break;

    case '45':  // no-spec
      this.terminal.setReverseWraparound(state);
      break;

    case '67':  // DECBKM
      this.terminal.keyboard.backspaceSendsBackspace = state;
      break;

    case '1000':  // Report on mouse clicks only.
      this.mouseReport = (
          state ? this.MOUSE_REPORT_CLICK : this.MOUSE_REPORT_DISABLED);
      break;

    case '1002':  // Report on mouse clicks and drags
      this.mouseReport = (
          state ? this.MOUSE_REPORT_DRAG : this.MOUSE_REPORT_DISABLED);
      break;

    case '1010':  // rxvt
      this.terminal.scrollOnOutput = state;
      break;

    case '1011':  // rxvt
      this.terminal.scrollOnKeystroke = state;
      break;

    case '1036':  // no-spec
      this.terminal.keyboard.metaSendsEscape = state;
      break;

    case '1039':  // no-spec
      this.terminal.keyboard.altSendsEscape = state;
      break;

    case '47':
    case '1047':  // no-spec
      this.terminal.setAlternateMode(state);
      break;

    case '1048':  // Save cursor as in DECSC.
      this.savedState_.save();

    case '1049':  // 1047 + 1048 + clear.
      if (state) {
        this.savedState_.save();
        this.terminal.setAlternateMode(state);
        this.terminal.clear();
      } else {
        this.terminal.setAlternateMode(state);
        this.savedState_.restore();
      }

      break;

    default:
      if (this.warnUnimplemented)
        console.warn('Unimplemented DEC Private Mode: ' + code);
      break;
  }
};

/**
 * Function shared by control characters and escape sequences that are
 * ignored.
 */
hterm.VT.ignore = function() {};

/**
 * Collection of control characters expressed in a single byte.
 *
 * This includes the characters from the C0 and C1 sets (see [CTRL]) that we
 * care about.  Two byte versions of the C1 codes are defined in the
 * hterm.VT.ESC collection.
 *
 * The 'CC1' mnemonic here refers to the fact that these are one-byte Control
 * Codes.  It's only used in this source file and not defined in any of the
 * referenced documents.
 */
hterm.VT.CC1 = {};

/**
 * Collection of two-byte and three-byte sequences starting with ESC.
 */
hterm.VT.ESC = {};

/**
 * Collection of CSI (Control Sequence Introducer) sequences.
 *
 * These sequences begin with 'ESC [', and may take zero or more arguments.
 */
hterm.VT.CSI = {};

/**
 * Collection of OSC (Operating System Control) sequences.
 *
 * These sequences begin with 'ESC ]', followed by a function number and a
 * string terminated by either ST or BEL.
 */
hterm.VT.OSC = {};

/**
 * Collection of VT52 sequences.
 *
 * When in VT52 mode, other sequences are disabled.
 */
hterm.VT.VT52 = {};

/**
 * Null (NUL).
 *
 * Silently ignored.
 */
hterm.VT.CC1['\x00'] = function () {};

/**
 * Enquiry (ENQ).
 *
 * Transmit answerback message.
 *
 * The default answerback message in xterm is an empty string, so we just
 * ignore this.
 */
hterm.VT.CC1['\x05'] = hterm.VT.ignore;

/**
 * Ring Bell (BEL).
 */
hterm.VT.CC1['\x07'] = function() {
  this.terminal.ringBell();
};

/**
 * Backspace (BS).
 *
 * Move the cursor to the left one character position, unless it is at the
 * left margin, in which case no action occurs.
 */
hterm.VT.CC1['\x08'] = function() {
  this.terminal.cursorLeft(1);
};

/**
 * Horizontal Tab (HT).
 *
 * Move the cursor to the next tab stop, or to the right margin if no further
 * tab stops are present on the line.
 */
hterm.VT.CC1['\x09'] = function() {
  this.terminal.forwardTabStop();
};

/**
 * Line Feed (LF).
 *
 * This code causes a line feed or a new line operation.  See Automatic
 * Newline (LNM).
 */
hterm.VT.CC1['\x0a'] = function() {
  this.terminal.formFeed();
};

/**
 * Vertical Tab (VT).
 *
 * Interpreted as LF.
 */
hterm.VT.CC1['\x0b'] = hterm.VT.CC1['\x0a'];

/**
 * Form Feed (FF).
 *
 * Interpreted as LF.
 */
hterm.VT.CC1['\x0c'] = function() {
  this.terminal.formFeed();
};

/**
 * Carriage Return (CR).
 *
 * Move cursor to the left margin on the current line.
 */
hterm.VT.CC1['\x0d'] = function() {
  this.terminal.setCursorColumn(0);
};

/**
 * Shift Out (SO), aka Lock Shift 0 (LS1).
 *
 * Invoke G1 character set in GL.
 */
hterm.VT.CC1['\x0e'] = function() {
  this.GL = 'G1';
};

/**
 * Shift In (SI), aka Lock Shift 0 (LS0).
 *
 * Invoke G0 character set in GL.
 */
hterm.VT.CC1['\x0f'] = function() {
  this.GL = 'G0';
};

/**
 * Transmit On (XON).
 *
 * Not currently implemented.
 *
 * TODO(rginda): Implement?
 */
hterm.VT.CC1['\x11'] = hterm.VT.ignore;

/**
 * Transmit Off (XOFF).
 *
 * Not currently implemented.
 *
 * TODO(rginda): Implement?
 */
hterm.VT.CC1['\x13'] = hterm.VT.ignore;

/**
 * Cancel (CAN).
 *
 * If sent during a control sequence, the sequence is immediately terminated
 * and not executed.
 *
 * It also causes the error character to be displayed.
 */
hterm.VT.CC1['\x18'] = function(parseState) {
  parseState.resetParseFunction();
  this.terminal.print('?');
};

/**
 * Substitute (SUB).
 *
 * Interpreted as CAN.
 */
hterm.VT.CC1['\x1a'] = hterm.VT.CC1['\x18'];

/**
 * Escape (ESC).
 */
hterm.VT.CC1['\x1b'] = function(parseState) {
  function parseESC(parseState) {
    var ch = parseState.consumeChar();

    if (ch == '\x1b')
      return;

    this.dispatch('ESC', ch, parseState);

    if (parseState.func == parseESC)
      parseState.resetParseFunction();
  };

  parseState.func = parseESC;
};

/**
 * Delete (DEL).
 */
hterm.VT.CC1['\x7f'] = hterm.VT.ignore;

// 8 bit control characters and their two byte equivalents, below...

/**
 * Index (IND).
 *
 * Like newline, only keep the X position
 */
hterm.VT.CC1['\x84'] =
hterm.VT.ESC['D'] = function() {
  this.terminal.lineFeed();
};

/**
 * Next Line (NEL).
 *
 * Like newline, but doesn't add lines.
 */
hterm.VT.CC1['\x85'] =
hterm.VT.ESC['E'] = function() {
  this.terminal.setCursorColumn(0);
  this.terminal.cursorDown(1);
};

/**
 * Horizontal Tabulation Set (HTS).
 */
hterm.VT.CC1['\x88'] =
hterm.VT.ESC['H'] = function() {
  this.terminal.setTabStop(this.terminal.getCursorColumn());
};

/**
 * Reverse Index (RI).
 *
 * Move up one line.
 */
hterm.VT.CC1['\x8d'] =
hterm.VT.ESC['M'] = function() {
  this.terminal.reverseLineFeed();
};

/**
 * Single Shift 2 (SS2).
 *
 * Select of G2 Character Set for the next character only.
 *
 * Not currently implemented.
 */
hterm.VT.CC1['\x8e'] =
hterm.VT.ESC['N'] = hterm.VT.ignore;

/**
 * Single Shift 3 (SS3).
 *
 * Select of G3 Character Set for the next character only.
 *
 * Not currently implemented.
 */
hterm.VT.CC1['\x8f'] =
hterm.VT.ESC['O'] = hterm.VT.ignore;

/**
 * Device Control String (DCS).
 *
 * Indicate a DCS sequence.  See Device-Control functions in [XTERM].
 * Not currently implemented.
 *
 * TODO(rginda): Consider implementing DECRQSS, the rest don't seem applicable.
 */
hterm.VT.CC1['\x90'] =
hterm.VT.ESC['P'] = function(parseState) {
  parseState.resetArguments();
  parseState.func = this.parseUntilStringTerminator_;
};

/**
 * Start of Protected Area (SPA).
 *
 * Will not implement.
 */
hterm.VT.CC1['\x96'] =
hterm.VT.ESC['V'] = hterm.VT.ignore;

/**
 * End of Protected Area (EPA).
 *
 * Will not implement.
 */
hterm.VT.CC1['\x97'] =
hterm.VT.ESC['W'] = hterm.VT.ignore;

/**
 * Start of String (SOS).
 *
 * Will not implement.
 */
hterm.VT.CC1['\x98'] =
hterm.VT.ESC['X'] = hterm.VT.ignore;

/**
 * Single Character Introducer (SCI, also DECID).
 *
 * Return Terminal ID.  Obsolete form of 'ESC [ c' (DA).
 */
hterm.VT.CC1['\x9a'] =
hterm.VT.ESC['Z'] = function() {
  this.terminal.io.sendString('\x1b[?1;2c');
};

/**
 * Control Sequence Introducer (CSI).
 *
 * The lead into most escape sequences.  See [CSI].
 */
hterm.VT.CC1['\x9b'] =
hterm.VT.ESC['['] = function(parseState) {
  parseState.resetArguments();
  this.leadingModifier_ = '';
  this.trailingModifier_ = '';
  parseState.func = this.parseCSI_;
};

/**
 * String Terminator (ST).
 *
 * Used to terminate DCS/OSC/PM/APC commands which may take string arguments.
 *
 * We don't directly handle it here, as it's only used to terminate other
 * sequences.  See the 'parseUntilStringTerminator_' method.
 */
hterm.VT.CC1['\x9c'] =
hterm.VT.ESC['\\'] = hterm.VT.ignore;

/**
 * Operating System Command (OSC).
 *
 * Commands relating to the operating system.
 */
hterm.VT.CC1['\x9d'] =
hterm.VT.ESC[']'] = function(parseState) {
  parseState.resetArguments();

  function parseOSC(parseState) {
    if (!this.parseUntilStringTerminator_(parseState)) {
      // The string sequence was too long.
      return;
    }

    if (parseState.func == parseOSC) {
      // We're not done parsing the string yet.
      return;
    }

    // We're done.
    var ary = parseState.args[0].match(/^(\d+);(.*)$/);
    if (ary) {
      parseState.args[0] = ary[2];
      this.dispatch('OSC', ary[1], parseState);
    } else {
      console.warn('Invalid OSC: ' + JSON.stringify(parseState.args[0]));
    }
  };

  parseState.func = parseOSC;
};

/**
 * Privacy Message (PM).
 *
 * Will not implement.
 */
hterm.VT.CC1['\x9e'] =
hterm.VT.ESC['^'] = function(parseState) {
  parseState.resetArguments();
  parseState.func = this.parseUntilStringTerminator_;
};

/**
 * Application Program Control (APC).
 *
 * Will not implement.
 */
hterm.VT.CC1['\x9f'] =
hterm.VT.ESC['_'] = function(parseState) {
  parseState.resetArguments();
  parseState.func = this.parseUntilStringTerminator_;
};

/**
 * ESC \x20 - Unclear to me where these originated, possibly in xterm.
 *
 * Not currently implemented:
 *   ESC \x20 F - Select 7 bit escape codes in responses (S7C1T).
 *   ESC \x20 G - Select 8 bit escape codes in responses (S8C1T).
 *                NB: We currently assume S7C1T always.
 *
 * Will not implement:
 *   ESC \x20 L - Set ANSI conformance level 1.
 *   ESC \x20 M - Set ANSI conformance level 2.
 *   ESC \x20 N - Set ANSI conformance level 3.
 */
hterm.VT.ESC['\x20'] = function(parseState) {
  parseState.func = function(parseState) {
    var ch = parseState.consumeChar();
    if (this.warnUnimplemented)
      console.warn('Unimplemented sequence: ESC 0x20 ' + ch);
    parseState.resetParseFunction();
  };
};

/**
 * DEC 'ESC #' sequences.
 *
 * Handled:
 *   ESC # 8 - DEC Screen Alignment Test (DECALN).
 *             Fills the terminal with 'E's.  Used liberally by vttest.
 *
 * Ignored:
 *   ESC # 3 - DEC double-height line, top half (DECDHL).
 *   ESC # 4 - DEC double-height line, bottom half (DECDHL).
 *   ESC # 5 - DEC single-width line (DECSWL).
 *   ESC # 6 - DEC double-width line (DECDWL).
 */
hterm.VT.ESC['#'] = function(parseState) {
  parseState.func = function(parseState) {
    var ch = parseState.consumeChar();
    if (ch == '8')
      this.terminal.fill('E');

    parseState.resetParseFunction();
  };
};

/**
 * 'ESC %' sequences, character set control.  Not currently implemented.
 *
 * To be implemented (currently ignored):
 *   ESC % @ - Set ISO 8859-1 character set.
 *   ESC % G - Set UTF-8 character set.
 *
 * All other ESC # sequences are echoed to the terminal.
 *
 * TODO(rginda): Implement.
 */
hterm.VT.ESC['%'] = function(parseState) {
  parseState.func = function(parseState) {
    var ch = parseState.consumeChar();
    if (ch != '@' && ch != 'G' && this.warnUnimplemented)
      console.warn('Unknown ESC % argument: ' + JSON.stringify(ch));
    parseState.resetParseFunction();
  };
};

/**
 * Character Set Selection (SCS).
 *
 *   ESC ( Ps - Set G0 character set (VT100).
 *   ESC ) Ps - Set G1 character set (VT220).
 *   ESC * Ps - Set G2 character set (VT220).
 *   ESC + Ps - Set G3 character set (VT220).
 *   ESC - Ps - Set G1 character set (VT300).
 *   ESC . Ps - Set G2 character set (VT300).
 *   ESC / Ps - Set G3 character set (VT300).
 *
 * Values for Ps are:
 *   0 - DEC Special Character and Line Drawing Set.
 *   A - United Kingdom (UK).
 *   B - United States (USASCII).
 *   4 - Dutch.
 *   C or 5 - Finnish.
 *   R - French.
 *   Q - French Canadian.
 *   K - German.
 *   Y - Italian.
 *   E or 6 - Norwegian/Danish.
 *   Z - Spanish.
 *   H or 7 - Swedish.
 *   = - Swiss.
 *
 * All other sequences are echoed to the terminal.
 *
 * TODO(rginda): Implement.
 */
hterm.VT.ESC['('] =
hterm.VT.ESC[')'] =
hterm.VT.ESC['*'] =
hterm.VT.ESC['+'] =
hterm.VT.ESC['-'] =
hterm.VT.ESC['.'] =
hterm.VT.ESC['/'] = function(parseState, code) {
  parseState.func = function(parseState) {
    var ch = parseState.consumeChar();
    if (ch == '\x1b') {
      parseState.resetParseFunction();
      parseState.func();
      return;
    }

    if (ch in hterm.VT.CharacterMap.maps) {
      if (code == '(') {
        this.G0 = hterm.VT.CharacterMap.maps[ch];
      } else if (code == ')' || code == '-') {
        this.G1 = hterm.VT.CharacterMap.maps[ch];
      } else if (code == '*' || code == '.') {
        this.G2 = hterm.VT.CharacterMap.maps[ch];
      } else if (code == '+' || code == '/') {
        this.G3 = hterm.VT.CharacterMap.maps[ch];
      }
    } else if (this.warnUnimplemented) {
      console.log('Invalid character set for "' + code + '": ' + ch);
    }

    parseState.resetParseFunction();
  };
};

/**
 * Back Index (DECBI).
 *
 * VT420 and up.  Not currently implemented.
 */
hterm.VT.ESC['6'] = hterm.VT.ignore;

/**
 * Save Cursor (DECSC).
 */
hterm.VT.ESC['7'] = function() {
  this.savedState_.save();
};

/**
 * Restore Cursor (DECSC).
 */
hterm.VT.ESC['8'] = function() {
  this.savedState_.restore();
};

/**
 * Forward Index (DECFI).
 *
 * VT210 and up.  Not currently implemented.
 */
hterm.VT.ESC['9'] = hterm.VT.ignore;

/**
 * Application keypad (DECPAM).
 */
hterm.VT.ESC['='] = function() {
  this.terminal.keyboard.applicationKeypad = true;
};

/**
 * Normal keypad (DECPNM).
 */
hterm.VT.ESC['>'] = function() {
  this.terminal.keyboard.applicationKeypad = false;
};

/**
 * Cursor to lower left corner of screen.
 *
 * Will not implement.
 *
 * This is only recognized by xterm when the hpLowerleftBugCompat resource is
 * set.
 */
hterm.VT.ESC['F'] = hterm.VT.ignore;

/**
 * Full Reset (RIS).
 */
hterm.VT.ESC['c'] = function() {
  this.reset();
  this.terminal.reset();
};

/**
 * Memory lock/unlock.
 *
 * Will not implement.
 */
hterm.VT.ESC['l'] =
hterm.VT.ESC['m'] = hterm.VT.ignore;

/**
 * Lock Shift 2 (LS2)
 *
 * Invoke the G2 Character Set as GL.
 */
hterm.VT.ESC['n'] = function() {
  this.GL = 'G2';
};

/**
 * Lock Shift 3 (LS3)
 *
 * Invoke the G3 Character Set as GL.
 */
hterm.VT.ESC['o'] = function() {
  this.GL = 'G3';
};

/**
 * Lock Shift 2, Right (LS3R)
 *
 * Invoke the G3 Character Set as GR.
 */
hterm.VT.ESC['|'] = function() {
  this.GR = 'G3';
};

/**
 * Lock Shift 2, Right (LS2R)
 *
 * Invoke the G2 Character Set as GR.
 */
hterm.VT.ESC['}'] = function() {
  this.GR = 'G2';
};

/**
 * Lock Shift 1, Right (LS1R)
 *
 * Invoke the G1 Character Set as GR.
 */
hterm.VT.ESC['~'] = function() {
  this.GR = 'G1';
};

/**
 * Change icon name and window title.
 *
 * We only change the window title.
 */
hterm.VT.OSC['0'] = function(parseState) {
  this.terminal.setWindowTitle(parseState.args[0]);
};

/**
 * Change window title.
 */
hterm.VT.OSC['2'] = hterm.VT.OSC['0'];

/**
 * Set/read color palette.
 */
hterm.VT.OSC['4'] = function(parseState) {
  // Args come in as a single 'index1;rgb1 ... ;indexN;rgbN' string.
  // We split on the semicolon and iterate through the pairs.
  var args = parseState.args[0].split(';');

  var pairCount = parseInt(args.length / 2);
  var colorPalette = this.terminal.getTextAttributes().colorPalette;
  var responseArray = [];

  for (var pairNumber = 0; pairNumber < pairCount; ++pairNumber) {
    var colorIndex = parseInt(args[pairNumber * 2]);
    var colorValue = args[pairNumber * 2 + 1];

    if (colorIndex >= colorPalette.length)
      continue;

    if (colorValue == '?') {
      // '?' means we should report back the current color value.
      colorValue = lib.colors.rgbToX11(colorPalette[colorIndex]);
      if (colorValue)
        responseArray.push(colorIndex + ';' + colorValue);

      continue;
    }

    colorValue = lib.colors.x11ToCSS(colorValue);
    if (colorValue)
      colorPalette[colorIndex] = colorValue;
  }

  if (responseArray.length)
    this.terminal.io.sendString('\x1b]4;' + responseArray.join(';') + '\x07');
};

/**
 * Set the cursor shape.
 *
 * Parameter is expected to be in the form "CursorShape=number", where number is
 * one of:
 *
 *   0 - Block
 *   1 - I-Beam
 *   2 - Underline
 *
 * This is a bit of a de-facto standard supported by iTerm 2 and Konsole.  See
 * also: DECSCUSR.
 *
 * Invalid numbers will restore the cursor to the block shape.
 */
hterm.VT.OSC['50'] = function(parseState) {
  var args = parseState.args[0].match(/CursorShape=(.)/i);
  if (!args) {
    console.warn('Could not parse OSC 50 args: ' + parseState.args[0]);
    return;
  }

  switch (args[1]) {
    case '1':
      this.terminal.setCursorShape(hterm.Terminal.cursorShape.BEAM);
      break;

    case '2':
      this.terminal.setCursorShape(hterm.Terminal.cursorShape.UNDERLINE);
      break;

    default:
      this.terminal.setCursorShape(hterm.Terminal.cursorShape.BLOCK);
  }
};

/**
 * Set/read system clipboard.
 *
 * Read is not implemented due to security considerations.  A remote app
 * that is able to both write and read to the clipboard could essentially
 * take over your session.
 *
 * The clipboard data will be decoded according to the 'receive-encoding'
 * preference.
 */
hterm.VT.OSC['52'] = function(parseState) {
  // Args come in as a single 'clipboard;b64-data' string.  The clipboard
  // parameter is used to select which of the X clipboards to address.  Since
  // we're not integrating with X, we treat them all the same.
  var args = parseState.args[0].match(/^[cps01234567]+;(.*)/);
  if (!args)
    return;

  var data = window.atob(args[1]);
  if (data)
    this.terminal.copyStringToClipboard(this.decode(data));
};

/**
 * Insert (blank) characters (ICH).
 */
hterm.VT.CSI['@'] = function(parseState) {
  this.terminal.insertSpace(parseState.iarg(0, 1));
};

/**
 * Cursor Up (CUU).
 */
hterm.VT.CSI['A'] = function(parseState) {
  this.terminal.cursorUp(parseState.iarg(0, 1));
};

/**
 * Cursor Down (CUD).
 */
hterm.VT.CSI['B'] = function(parseState) {
  this.terminal.cursorDown(parseState.iarg(0, 1));
};

/**
 * Cursor Forward (CUF).
 */
hterm.VT.CSI['C'] = function(parseState) {
  this.terminal.cursorRight(parseState.iarg(0, 1));
};

/**
 * Cursor Backward (CUB).
 */
hterm.VT.CSI['D'] = function(parseState) {
  this.terminal.cursorLeft(parseState.iarg(0, 1));
};

/**
 * Cursor Next Line (CNL).
 *
 * This is like Cursor Down, except the cursor moves to the beginning of the
 * line as well.
 */
hterm.VT.CSI['E'] = function(parseState) {
  this.terminal.cursorDown(parseState.iarg(0, 1));
  this.terminal.setCursorColumn(0);
};

/**
 * Cursor Preceding Line (CPL).
 *
 * This is like Cursor Up, except the cursor moves to the beginning of the
 * line as well.
 */
hterm.VT.CSI['F'] = function(parseState) {
  this.terminal.cursorUp(parseState.iarg(0, 1));
  this.terminal.setCursorColumn(0);
};

/**
 * Cursor Character Absolute (CHA).
 */
hterm.VT.CSI['G'] = function(parseState) {
  this.terminal.setCursorColumn(parseState.iarg(0, 1) - 1);
};

/**
 * Cursor Position (CUP).
 */
hterm.VT.CSI['H'] = function(parseState) {
  this.terminal.setCursorPosition(parseState.iarg(0, 1) - 1,
                                  parseState.iarg(1, 1) - 1);
};

/**
 * Cursor Forward Tabulation (CHT).
 */
hterm.VT.CSI['I'] = function(parseState) {
  var count = parseState.iarg(0, 1);
  count = lib.f.clamp(count, 1, this.terminal.screenSize.width);
  for (var i = 0; i < count; i++) {
    this.terminal.forwardTabStop();
  }
};

/**
 * Erase in Display (ED, DECSED).
 */
hterm.VT.CSI['J'] =
hterm.VT.CSI['?J'] = function(parseState, code) {
  var arg = parseState.args[0];

  if (!arg || arg == '0') {
      this.terminal.eraseBelow();
  } else if (arg == '1') {
    this.terminal.eraseAbove();
  } else if (arg == '2') {
    this.terminal.clear();
  } else if (arg == '3') {
    // The xterm docs say this means "Erase saved lines", but we'll just clear
    // the display since killing the scrollback seems rude.
    this.terminal.clear();
  }
};

/**
 * Erase in line (EL, DECSEL).
 */
hterm.VT.CSI['K'] =
hterm.VT.CSI['?K'] = function(parseState, code) {
  var arg = parseState.args[0];

  if (!arg || arg == '0') {
    this.terminal.eraseToRight();
  } else if (arg == '1'){
    this.terminal.eraseToLeft();
  } else if (arg == '2') {
    this.terminal.eraseLine();
  }
};

/**
 * Insert Lines (IL).
 */
hterm.VT.CSI['L'] = function(parseState) {
  this.terminal.insertLines(parseState.iarg(0, 1));
};

/**
 * Delete Lines (DL).
 */
hterm.VT.CSI['M'] = function(parseState) {
  this.terminal.deleteLines(parseState.iarg(0, 1));
};

/**
 * Delete Characters (DCH).
 *
 * This command shifts the line contents left, starting at the cursor position.
 */
hterm.VT.CSI['P'] = function(parseState) {
  this.terminal.deleteChars(parseState.iarg(0, 1));
};

/**
 * Scroll Up (SU).
 */
hterm.VT.CSI['S'] = function(parseState) {
  this.terminal.vtScrollUp(parseState.iarg(0, 1));
};

/**
 * Scroll Down (SD).
 * Also 'Initiate highlight mouse tracking'.  Will not implement this part.
 */
hterm.VT.CSI['T'] = function(parseState) {
  if (parseState.args.length <= 1)
    this.terminal.vtScrollDown(parseState.iarg(0, 1));
};

/**
 * Reset one or more features of the title modes to the default value.
 *
 *   ESC [ > Ps T
 *
 * Normally, "reset" disables the feature. It is possible to disable the
 * ability to reset features by compiling a different default for the title
 * modes into xterm.
 *
 * Ps values:
 *   0 - Do not set window/icon labels using hexadecimal.
 *   1 - Do not query window/icon labels using hexadecimal.
 *   2 - Do not set window/icon labels using UTF-8.
 *   3 - Do not query window/icon labels using UTF-8.
 *
 * Will not implement.
 */
hterm.VT.CSI['>T'] = hterm.VT.ignore;

/**
 * Erase Characters (ECH).
 */
hterm.VT.CSI['X'] = function(parseState) {
  this.terminal.eraseToRight(parseState.iarg(0, 1));
};

/**
 * Cursor Backward Tabulation (CBT).
 */
hterm.VT.CSI['Z'] = function(parseState) {
  var count = parseState.iarg(0, 1);
  count = lib.f.clamp(count, 1, this.terminal.screenSize.width);
  for (var i = 0; i < count; i++) {
    this.terminal.backwardTabStop();
  }
};

/**
 * Character Position Absolute (HPA).
 */
hterm.VT.CSI['`'] = function(parseState) {
  this.terminal.setCursorColumn(parseState.iarg(0, 1) - 1);
};

/**
 * Repeat the preceding graphic character.
 *
 * Not currently implemented.
 */
hterm.VT.CSI['b'] = hterm.VT.ignore;

/**
 * Send Device Attributes (Primary DA).
 *
 * TODO(rginda): This is hardcoded to send back 'VT100 with Advanced Video
 * Option', but it may be more correct to send a VT220 response once
 * we fill out the 'Not currently implemented' parts.
 */
hterm.VT.CSI['c'] = function(parseState) {
  if (!parseState.args[0] || parseState.args[0] == '0') {
    this.terminal.io.sendString('\x1b[?1;2c');
  }
};

/**
 * Send Device Attributes (Secondary DA).
 *
 * TODO(rginda): This is hardcoded to send back 'VT100' but it may be more
 * correct to send a VT220 response once we fill out more 'Not currently
 * implemented' parts.
 */
hterm.VT.CSI['>c'] = function(parseState) {
  this.terminal.io.sendString('\x1b[>0;256;0c');
};

/**
 * Line Position Absolute (VPA).
 */
hterm.VT.CSI['d'] = function(parseState) {
  this.terminal.setAbsoluteCursorRow(parseState.iarg(0, 1) - 1);
};

/**
 * Horizontal and Vertical Position (HVP).
 *
 * Same as Cursor Position (CUP).
 */
hterm.VT.CSI['f'] = hterm.VT.CSI['H'];

/**
 * Tab Clear (TBC).
 */
hterm.VT.CSI['g'] = function(parseState) {
  if (!parseState.args[0] || parseState.args[0] == '0') {
    // Clear tab stop at cursor.
    this.terminal.clearTabStopAtCursor(false);
  } else if (parseState.args[0] == '3') {
    // Clear all tab stops.
    this.terminal.clearAllTabStops();
  }
};

/**
 * Set Mode (SM).
 */
hterm.VT.CSI['h'] = function(parseState) {
  for (var i = 0; i < parseState.args.length; i++) {
    this.setANSIMode(parseState.args[i], true);
  }
};

/**
 * DEC Private Mode Set (DECSET).
 */
hterm.VT.CSI['?h'] = function(parseState) {
  for (var i = 0; i < parseState.args.length; i++) {
    this.setDECMode(parseState.args[i], true);
  }
};

/**
 * Media Copy (MC).
 * Media Copy (MC, DEC Specific).
 *
 * These commands control the printer.  Will not implement.
 */
hterm.VT.CSI['i'] =
hterm.VT.CSI['?i'] = hterm.VT.ignore;

/**
 * Reset Mode (RM).
 */
hterm.VT.CSI['l'] = function(parseState) {
  for (var i = 0; i < parseState.args.length; i++) {
    this.setANSIMode(parseState.args[i], false);
  }
};

/**
 * DEC Private Mode Reset (DECRST).
 */
hterm.VT.CSI['?l'] = function(parseState) {
  for (var i = 0; i < parseState.args.length; i++) {
    this.setDECMode(parseState.args[i], false);
  }
};

/**
 * Character Attributes (SGR).
 *
 * Iterate through the list of arguments, applying the following attribute
 * changes based on the argument value...
 *
 *    0 Normal (default).
 *    1 Bold.
 *    4 Underlined.
 *    5 Blink (appears as Bold).
 *    7 Inverse.
 *    8 Invisible, i.e., hidden (VT300).
 *   22 Normal (neither bold nor faint).
 *   24 Not underlined.
 *   25 Steady (not blinking).
 *   27 Positive (not inverse).
 *   28 Visible, i.e., not hidden (VT300).
 *   30 Set foreground color to Black.
 *   31 Set foreground color to Red.
 *   32 Set foreground color to Green.
 *   33 Set foreground color to Yellow.
 *   34 Set foreground color to Blue.
 *   35 Set foreground color to Magenta.
 *   36 Set foreground color to Cyan.
 *   37 Set foreground color to White.
 *   39 Set foreground color to default (original).
 *   40 Set background color to Black.
 *   41 Set background color to Red.
 *   42 Set background color to Green.
 *   43 Set background color to Yellow.
 *   44 Set background color to Blue.
 *   45 Set background color to Magenta.
 *   46 Set background color to Cyan.
 *   47 Set background color to White.
 *   49 Set background color to default (original)
 *
 * For 16-color support, the following apply.
 *
 *   90 Set foreground color to Bright Black.
 *   91 Set foreground color to Bright Red.
 *   92 Set foreground color to Bright Green.
 *   93 Set foreground color to Bright Yellow.
 *   94 Set foreground color to Bright Blue.
 *   95 Set foreground color to Bright Magenta.
 *   96 Set foreground color to Bright Cyan.
 *   97 Set foreground color to Bright White.
 *  100 Set background color to Bright Black.
 *  101 Set background color to Bright Red.
 *  102 Set background color to Bright Green.
 *  103 Set background color to Bright Yellow.
 *  104 Set background color to Bright Blue.
 *  105 Set background color to Bright Magenta.
 *  106 Set background color to Bright Cyan.
 *  107 Set background color to Bright White.
 *
 * For 88- or 256-color support, the following apply.
 *  38 ; 5 ; P Set foreground color to P.
 *  48 ; 5 ; P Set background color to P.
 *
 * Note that most terminals consider "bold" to be "bold and bright".  In
 * some documents the bold state is even referred to as bright.  We interpret
 * bold as bold-bright here too, but only when the "bold" setting comes before
 * the color selection.
 */
hterm.VT.CSI['m'] = function(parseState) {
  function get256(i) {
    if (parseState.args.length < i + 2 || parseState.args[i + 1] != '5')
      return null;

    return parseState.iarg(i + 2, 0);
  }

  var attrs = this.terminal.getTextAttributes();

  if (!parseState.args.length) {
    attrs.reset();
    return;
  }

  for (var i = 0; i < parseState.args.length; i++) {
    var arg = parseState.iarg(i, 0);

    if (arg < 30) {
      if (arg == 0) {
        attrs.reset();
      } else if (arg == 1) {
        attrs.bold = true;
      } else if (arg == 4) {
        attrs.underline = true;
      } else if (arg == 5) {
        attrs.blink = true;
      } else if (arg == 7) {  // Inverse.
        attrs.inverse = true;
      } else if (arg == 8) {  // Invisible.
        attrs.invisible = true;
      } else if (arg == 22) {
        attrs.bold = false;
      } else if (arg == 24) {
        attrs.underline = false;
      } else if (arg == 25) {
        attrs.blink = false;
      } else if (arg == 27) {
        attrs.inverse = false;
      } else if (arg == 28) {
        attrs.invisible = false;
      }

    } else if (arg < 50) {
      // Select fore/background color from bottom half of 16 color palette
      // or from the 256 color palette.
      if (arg < 38) {
        attrs.foregroundIndex = arg - 30;

      } else if (arg == 38) {
        var c = get256(i);
        if (c == null)
          break;

        i += 2;

        if (c >= attrs.colorPalette.length)
          continue;

        attrs.foregroundIndex = c;

      } else if (arg == 39) {
        attrs.foregroundIndex = null;

      } else if (arg < 48) {
        attrs.backgroundIndex = arg - 40;

      } else if (arg == 48) {
        var c = get256(i);
        if (c == null)
          break;

        i += 2;

        if (c >= attrs.colorPalette.length)
          continue;

        attrs.backgroundIndex = c;
      } else {
        attrs.backgroundIndex = null;
      }

    } else if (arg >= 90 && arg <= 97) {
      attrs.foregroundIndex = arg - 90 + 8;

    } else if (arg >= 100 && arg <= 107) {
      attrs.backgroundIndex = arg - 100 + 8;
    }
  }

  attrs.setDefaults(this.terminal.getForegroundColor(),
                    this.terminal.getBackgroundColor());
};

/**
 * Set xterm-specific keyboard modes.
 *
 * Will not implement.
 */
hterm.VT.CSI['>m'] = hterm.VT.ignore;

/**
 * Device Status Report (DSR, DEC Specific).
 *
 * 5 - Status Report. Result (OK) is CSI 0 n
 * 6 - Report Cursor Position (CPR) [row;column]. Result is CSI r ; c R
 */
hterm.VT.CSI['n'] = function(parseState) {
  if (parseState.args[0] == '5') {
    this.terminal.io.sendString('\x1b0n');
  } else if (parseState.args[0] == '6') {
    var row = this.terminal.getCursorRow() + 1;
    var col = this.terminal.getCursorColumn() + 1;
    this.terminal.io.sendString('\x1b[' + row + ';' + col + 'R');
  }
};

/**
 * Disable modifiers which may be enabled via CSI['>m'].
 *
 * Will not implement.
 */
hterm.VT.CSI['>n'] = hterm.VT.ignore;

/**
 * Device Status Report (DSR, DEC Specific).
 *
 * 6  - Report Cursor Position (CPR) [row;column] as CSI ? r ; c R
 * 15 - Report Printer status as CSI ? 1 0 n (ready) or
 *      CSI ? 1 1 n (not ready).
 * 25 - Report UDK status as CSI ? 2 0 n (unlocked) or CSI ? 2 1 n (locked).
 * 26 - Report Keyboard status as CSI ? 2 7 ; 1 ; 0 ; 0 n (North American).
 *      The last two parameters apply to VT400 & up, and denote keyboard ready
 *      and LK01 respectively.
 * 53 - Report Locator status as CSI ? 5 3 n Locator available, if compiled-in,
 *      or CSI ? 5 0 n No Locator, if not.
 */
hterm.VT.CSI['?n'] = function(parseState) {
  if (parseState.args[0] == '6') {
    var row = this.terminal.getCursorRow() + 1;
    var col = this.terminal.getCursorColumn() + 1;
    this.terminal.io.sendString('\x1b[' + row + ';' + col + 'R');
  } else if (parseState.args[0] == '15') {
    this.terminal.io.sendString('\x1b[?11n');
  } else if (parseState.args[0] == '25') {
    this.terminal.io.sendString('\x1b[?21n');
  } else if (parseState.args[0] == '26') {
    this.terminal.io.sendString('\x1b[?12;1;0;0n');
  } else if (parseState.args[0] == '53') {
    this.terminal.io.sendString('\x1b[?50n');
  }
};

/**
 * This is used by xterm to decide whether to hide the pointer cursor as the
 * user types.
 *
 * Valid values for the parameter:
 *   0 - Never hide the pointer.
 *   1 - Hide if the mouse tracking mode is not enabled.
 *   2 - Always hide the pointer.
 *
 * If no parameter is given, xterm uses the default, which is 1.
 *
 * Not currently implemented.
 */
hterm.VT.CSI['>p'] = hterm.VT.ignore;

/**
 * Soft terminal reset (DECSTR).
 */
hterm.VT.CSI['!p'] = function() {
  this.reset();
  this.terminal.softReset();
};

/**
 * Request ANSI Mode (DECRQM).
 *
 * Not currently implemented.
 */
hterm.VT.CSI['$p'] = hterm.VT.ignore;
hterm.VT.CSI['?$p'] = hterm.VT.ignore;

/**
 * Set conformance level (DECSCL).
 *
 * Not currently implemented.
 */
hterm.VT.CSI['"p'] = hterm.VT.ignore;

/**
 * Load LEDs (DECLL).
 *
 * Not currently implemented.  Could be implemented as virtual LEDs overlaying
 * the terminal if anyone cares.
 */
hterm.VT.CSI['q'] = hterm.VT.ignore;

/**
 * Set cursor style (DECSCUSR, VT520).
 *
 *   0 - Blinking block.
 *   1 - Blinking block (default).
 *   2 - Steady block.
 *   3 - Blinking underline.
 *   4 - Steady underline.
 */
hterm.VT.CSI[' q'] = function(parseState) {
  var arg = parseState.args[0];

  if (arg == '0' || arg == '1') {
    this.terminal.setCursorShape(hterm.Terminal.cursorShape.BLOCK);
    this.terminal.setCursorBlink(true);
  } else if (arg == '2') {
    this.terminal.setCursorShape(hterm.Terminal.cursorShape.BLOCK);
    this.terminal.setCursorBlink(false);
  } else if (arg == '3') {
    this.terminal.setCursorShape(hterm.Terminal.cursorShape.UNDERLINE);
    this.terminal.setCursorBlink(true);
  } else if (arg == '4') {
    this.terminal.setCursorShape(hterm.Terminal.cursorShape.UNDERLINE);
    this.terminal.setCursorBlink(false);
  } else {
    console.warn('Unknown cursor style: ' + arg);
  }
};

/**
 * Select character protection attribute (DECSCA).
 *
 * Will not implement.
 */
hterm.VT.CSI['"q'] = hterm.VT.ignore;

/**
 * Set Scrolling Region (DECSTBM).
 */
hterm.VT.CSI['r'] = function(parseState) {
  var args = parseState.args;
  var scrollTop = args[0] ? parseInt(args[0], 10) -1 : null;
  var scrollBottom = args[1] ? parseInt(args[1], 10) - 1 : null;
  this.terminal.setVTScrollRegion(scrollTop, scrollBottom);
  this.terminal.setCursorPosition(0, 0);
};

/**
 * Restore DEC Private Mode Values.
 *
 * Will not implement.
 */
hterm.VT.CSI['?r'] = hterm.VT.ignore;

/**
 * Change Attributes in Rectangular Area (DECCARA)
 *
 * Will not implement.
 */
hterm.VT.CSI['$r'] = hterm.VT.ignore;

/**
 * Save cursor (ANSI.SYS)
 */
hterm.VT.CSI['s'] = function() {
  this.savedState_.save();
};

/**
 * Save DEC Private Mode Values.
 *
 * Will not implement.
 */
hterm.VT.CSI['?s'] = hterm.VT.ignore;

/**
 * Window manipulation (from dtterm, as well as extensions).
 *
 * Will not implement.
 */
hterm.VT.CSI['t'] = hterm.VT.ignore;

/**
 * Reverse Attributes in Rectangular Area (DECRARA).
 *
 * Will not implement.
 */
hterm.VT.CSI['$t'] = hterm.VT.ignore;

/**
 * Set one or more features of the title modes.
 *
 * Will not implement.
 */
hterm.VT.CSI['>t'] = hterm.VT.ignore;

/**
 * Set warning-bell volume (DECSWBV, VT520).
 *
 * Will not implement.
 */
hterm.VT.CSI[' t'] = hterm.VT.ignore;

/**
 * Restore cursor (ANSI.SYS).
 */
hterm.VT.CSI['u'] = function() {
  this.terminal.restoreOptions();
};

/**
 * Set margin-bell volume (DECSMBV, VT520).
 *
 * Will not implement.
 */
hterm.VT.CSI[' u'] = hterm.VT.ignore;

/**
 * Copy Rectangular Area (DECCRA, VT400 and up).
 *
 * Will not implement.
 */
hterm.VT.CSI['$v'] = hterm.VT.ignore;

/**
 * Enable Filter Rectangle (DECEFR).
 *
 * Will not implement.
 */
hterm.VT.CSI['\'w'] = hterm.VT.ignore;

/**
 * Request Terminal Parameters (DECREQTPARM).
 *
 * Not currently implemented.
 */
hterm.VT.CSI['x'] = hterm.VT.ignore;

/**
 * Select Attribute Change Extent (DECSACE).
 *
 * Will not implement.
 */
hterm.VT.CSI['*x'] = hterm.VT.ignore;

/**
 * Fill Rectangular Area (DECFRA), VT420 and up.
 *
 * Will not implement.
 */
hterm.VT.CSI['$x'] = hterm.VT.ignore;

/**
 * Enable Locator Reporting (DECELR).
 *
 * Not currently implemented.
 */
hterm.VT.CSI['\'z'] = hterm.VT.ignore;

/**
 * Erase Rectangular Area (DECERA), VT400 and up.
 *
 * Will not implement.
 */
hterm.VT.CSI['$z'] = hterm.VT.ignore;

/**
 * Select Locator Events (DECSLE).
 *
 * Not currently implemented.
 */
hterm.VT.CSI['\'{'] = hterm.VT.ignore;

/**
 * Request Locator Position (DECRQLP).
 *
 * Not currently implemented.
 */
hterm.VT.CSI['\'|'] = hterm.VT.ignore;

/**
 * Insert Columns (DECIC), VT420 and up.
 *
 * Will not implement.
 */
hterm.VT.CSI[' }'] = hterm.VT.ignore;

/**
 * Delete P s Columns (DECDC), VT420 and up.
 *
 * Will not implement.
 */
hterm.VT.CSI[' ~'] = hterm.VT.ignore;
// SOURCE FILE: hterm/js/hterm_vt_character_map.js
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

lib.rtdep('lib.f');

/**
 * Character map object.
 *
 * @param {object} The GL mapping from input characters to output characters.
 *     The GR mapping will be automatically created.
 */
hterm.VT.CharacterMap = function(name, glmap) {
  /**
   * Short name for this character set, useful for debugging.
   */
  this.name = name;

  /**
   * The function to call to when this map is installed in GL.
   */
  this.GL = null;

  /**
   * The function to call to when this map is installed in GR.
   */
  this.GR = null;

  if (glmap)
    this.reset(glmap);
};

/**
 * @param {object} The GL mapping from input characters to output characters.
 *     The GR mapping will be automatically created.
 */
hterm.VT.CharacterMap.prototype.reset = function(glmap) {
  // Set the the GL mapping.
  this.glmap = glmap;

  var glkeys = Object.keys(this.glmap).map(function(key) {
      return '\\x' + lib.f.zpad(key.charCodeAt(0).toString(16));
    });

  this.glre = new RegExp('[' + glkeys.join('') + ']', 'g');

  // Compute the GR mapping.
  // This is the same as GL except all keys have their MSB set.
  this.grmap = {};

  glkeys.forEach(function(glkey) {
      var grkey = String.fromCharCode(glkey.charCodeAt(0) & 0x80);
      this.grmap[grkey] = this.glmap[glkey];
    }.bind(this));

  var grkeys = Object.keys(this.grmap).map(function(key) {
      return '\\x' + lib.f.zpad(key.charCodeAt(0).toString(16), 2);
    });

  this.grre = new RegExp('[' + grkeys.join('') + ']', 'g');

  this.GL = function(str) {
    return str.replace(this.glre,
                       function(ch) { return this.glmap[ch] }.bind(this));
  }.bind(this);

  this.GR = function(str) {
    return str.replace(this.grre,
                       function(ch) { return this.grmap[ch] }.bind(this));
  }.bind(this);
};

/**
 * Mapping from received to display character, used depending on the active
 * VT character set.
 */
hterm.VT.CharacterMap.maps = {};

/**
 * VT100 Graphic character map.
 * http://vt100.net/docs/vt220-rm/table2-4.html
 */
hterm.VT.CharacterMap.maps['0'] = new hterm.VT.CharacterMap(
    'graphic', {
      '\x60':'\u25c6',  // ` -> diamond
      '\x61':'\u2592',  // a -> grey-box
      '\x62':'\u2409',  // b -> h/t
      '\x63':'\u240c',  // c -> f/f
      '\x64':'\u240d',  // d -> c/r
      '\x65':'\u240a',  // e -> l/f
      '\x66':'\u00b0',  // f -> degree
      '\x67':'\u00b1',  // g -> +/-
      '\x68':'\u2424',  // h -> n/l
      '\x69':'\u240b',  // i -> v/t
      '\x6a':'\u2518',  // j -> bottom-right
      '\x6b':'\u2510',  // k -> top-right
      '\x6c':'\u250c',  // l -> top-left
      '\x6d':'\u2514',  // m -> bottom-left
      '\x6e':'\u253c',  // n -> line-cross
      '\x6f':'\u23ba',  // o -> scan1
      '\x70':'\u23bb',  // p -> scan3
      '\x71':'\u2500',  // q -> scan5
      '\x72':'\u23bc',  // r -> scan7
      '\x73':'\u23bd',  // s -> scan9
      '\x74':'\u251c',  // t -> left-tee
      '\x75':'\u2524',  // u -> right-tee
      '\x76':'\u2534',  // v -> bottom-tee
      '\x77':'\u252c',  // w -> top-tee
      '\x78':'\u2502',  // x -> vertical-line
      '\x79':'\u2264',  // y -> less-equal
      '\x7a':'\u2265',  // z -> greater-equal
      '\x7b':'\u03c0',  // { -> pi
      '\x7c':'\u2260',  // | -> not-equal
      '\x7d':'\u00a3',  // } -> british-pound
      '\x7e':'\u00b7',  // ~ -> dot
    });

/**
 * British character map.
 * http://vt100.net/docs/vt220-rm/table2-5.html
 */
hterm.VT.CharacterMap.maps['A'] = new hterm.VT.CharacterMap(
    'british', {
      '\x23': '\u00a3',  // # -> british-pound
    });

/**
 * US ASCII map, no changes.
 */
hterm.VT.CharacterMap.maps['B'] = new hterm.VT.CharacterMap(
    'us', null);

/**
 * Dutch character map.
 * http://vt100.net/docs/vt220-rm/table2-6.html
 */
hterm.VT.CharacterMap.maps['4'] = new hterm.VT.CharacterMap(
    'dutch', {
      '\x23': '\u00a3',  // # -> british-pound

      '\x40': '\u00be',  // @ -> 3/4

      '\x5b': '\u0132',  // [ -> 'ij' ligature (xterm goes with \u00ff?)
      '\x5c': '\u00bd',  // \ -> 1/2
      '\x5d': '\u007c',  // ] -> vertical bar

      '\x7b': '\u00a8',  // { -> two dots
      '\x7c': '\u0066',  // | -> f
      '\x7d': '\u00bc',  // } -> 1/4
      '\x7e': '\u00b4',  // ~ -> acute
    });

/**
 * Finnish character map.
 * http://vt100.net/docs/vt220-rm/table2-7.html
 */
hterm.VT.CharacterMap.maps['C'] =
hterm.VT.CharacterMap.maps['5'] = new hterm.VT.CharacterMap(
    'finnish', {
      '\x5b': '\u00c4',  // [ -> 'A' umlaut
      '\x5c': '\u00d6',  // \ -> 'O' umlaut
      '\x5d': '\u00c5',  // ] -> 'A' ring
      '\x5e': '\u00dc',  // ~ -> 'u' umlaut

      '\x60': '\u00e9',  // ` -> 'e' acute

      '\x7b': '\u00e4',  // { -> 'a' umlaut
      '\x7c': '\u00f6',  // | -> 'o' umlaut
      '\x7d': '\u00e5',  // } -> 'a' ring
      '\x7e': '\u00fc',  // ~ -> 'u' umlaut
    });

/**
 * French character map.
 * http://vt100.net/docs/vt220-rm/table2-8.html
 */
hterm.VT.CharacterMap.maps['R'] = new hterm.VT.CharacterMap(
    'french', {
      '\x23': '\u00a3',  // # -> british-pound

      '\x40': '\u00e0',  // @ -> 'a' grave

      '\x5b': '\u00b0',  // [ -> ring
      '\x5c': '\u00e7',  // \ -> 'c' cedilla
      '\x5d': '\u00a7',  // ] -> section symbol (double s)

      '\x7b': '\u00e9',  // { -> 'e' acute
      '\x7c': '\u00f9',  // | -> 'u' grave
      '\x7d': '\u00e8',  // } -> 'e' grave
      '\x7e': '\u00a8',  // ~ -> umlaut
    });

/**
 * French Canadian character map.
 * http://vt100.net/docs/vt220-rm/table2-9.html
 */
hterm.VT.CharacterMap.maps['Q'] = new hterm.VT.CharacterMap(
    'french canadian', {
      '\x40': '\u00e0',  // @ -> 'a' grave

      '\x5b': '\u00e2',  // [ -> 'a' circumflex
      '\x5c': '\u00e7',  // \ -> 'c' cedilla
      '\x5d': '\u00ea',  // ] -> 'e' circumflex
      '\x5e': '\u00ee',  // ^ -> 'i' circumflex

      '\x60': '\u00f4',  // ` -> 'o' circumflex

      '\x7b': '\u00e9',  // { -> 'e' acute
      '\x7c': '\u00f9',  // | -> 'u' grave
      '\x7d': '\u00e8',  // } -> 'e' grave
      '\x7e': '\u00fb',  // ~ -> 'u' circumflex
    });

/**
 * German character map.
 * http://vt100.net/docs/vt220-rm/table2-10.html
 */
hterm.VT.CharacterMap.maps['K'] = new hterm.VT.CharacterMap(
    'german', {
      '\x40': '\u00a7',  // @ -> section symbol (double s)

      '\x5b': '\u00c4',  // [ -> 'A' umlaut
      '\x5c': '\u00d6',  // \ -> 'O' umlaut
      '\x5d': '\u00dc',  // ] -> 'U' umlaut

      '\x7b': '\u00e4',  // { -> 'a' umlaut
      '\x7c': '\u00f6',  // | -> 'o' umlaut
      '\x7d': '\u00fc',  // } -> 'u' umlaut
      '\x7e': '\u00df',  // ~ -> eszett
    });

/**
 * Italian character map.
 * http://vt100.net/docs/vt220-rm/table2-11.html
 */
hterm.VT.CharacterMap.maps['Y'] = new hterm.VT.CharacterMap(
    'italian', {
      '\x23': '\u00a3',  // # -> british-pound

      '\x40': '\u00a7',  // @ -> section symbol (double s)

      '\x5b': '\u00b0',  // [ -> ring
      '\x5c': '\u00e7',  // \ -> 'c' cedilla
      '\x5d': '\u00e9',  // ] -> 'e' acute

      '\x60': '\u00f9',  // ` -> 'u' grave

      '\x7b': '\u00e0',  // { -> 'a' grave
      '\x7c': '\u00f2',  // | -> 'o' grave
      '\x7d': '\u00e8',  // } -> 'e' grave
      '\x7e': '\u00ec',  // ~ -> 'i' grave
    });

/**
 * Norwegian/Danish character map.
 * http://vt100.net/docs/vt220-rm/table2-12.html
 */
hterm.VT.CharacterMap.maps['E'] =
hterm.VT.CharacterMap.maps['6'] = new hterm.VT.CharacterMap(
    'norwegian/danish', {
      '\x40': '\u00c4',  // @ -> 'A' umlaut

      '\x5b': '\u00c6',  // [ -> 'AE' ligature
      '\x5c': '\u00d8',  // \ -> 'O' stroke
      '\x5d': '\u00c5',  // ] -> 'A' ring
      '\x5e': '\u00dc',  // ^ -> 'U' umlaut

      '\x60': '\u00e4',  // ` -> 'a' umlaut

      '\x7b': '\u00e6',  // { -> 'ae' ligature
      '\x7c': '\u00f8',  // | -> 'o' stroke
      '\x7d': '\u00e5',  // } -> 'a' ring
      '\x7e': '\u00fc',  // ~ -> 'u' umlaut
    });

/**
 * Spanish character map.
 * http://vt100.net/docs/vt220-rm/table2-13.html
 */
hterm.VT.CharacterMap.maps['Z'] = new hterm.VT.CharacterMap(
    'spanish', {
      '\x23': '\u00a3',  // # -> british-pound

      '\x40': '\u00a7',  // @ -> section symbol (double s)

      '\x5b': '\u00a1',  // [ -> '!' inverted
      '\x5c': '\u00d1',  // \ -> 'N' tilde
      '\x5d': '\u00bf',  // ] -> '?' inverted

      '\x7b': '\u00b0',  // { -> ring
      '\x7c': '\u00f1',  // | -> 'n' tilde
      '\x7d': '\u00e7',  // } -> 'c' cedilla
    });

/**
 * Swedish character map.
 * http://vt100.net/docs/vt220-rm/table2-14.html
 */
hterm.VT.CharacterMap.maps['7'] =
hterm.VT.CharacterMap.maps['H'] = new hterm.VT.CharacterMap(
    'swedish', {
      '\x40': '\u00c9',  // @ -> 'E' acute

      '\x5b': '\u00c4',  // [ -> 'A' umlaut
      '\x5c': '\u00d6',  // \ -> 'O' umlaut
      '\x5d': '\u00c5',  // ] -> 'A' ring
      '\x5e': '\u00dc',  // ^ -> 'U' umlaut

      '\x60': '\u00e9',  // ` -> 'e' acute

      '\x7b': '\u00e4',  // { -> 'a' umlaut
      '\x7c': '\u00f6',  // | -> 'o' umlaut
      '\x7d': '\u00e5',  // } -> 'a' ring
      '\x7e': '\u00fc',  // ~ -> 'u' umlaut
    });

/**
 * Swiss character map.
 * http://vt100.net/docs/vt220-rm/table2-15.html
 */
hterm.VT.CharacterMap.maps['='] = new hterm.VT.CharacterMap(
    'swiss', {
      '\x23': '\u00f9',  // # -> 'u' grave

      '\x40': '\u00e0',  // @ -> 'a' grave

      '\x5b': '\u00e9',  // [ -> 'e' acute
      '\x5c': '\u00e7',  // \ -> 'c' cedilla
      '\x5d': '\u00ea',  // ] -> 'e' circumflex
      '\x5e': '\u00ee',  // ^ -> 'i' circumflex
      '\x5f': '\u00e8',  // _ -> 'e' grave

      '\x60': '\u00f4',  // ` -> 'o' circumflex

      '\x7b': '\u00e4',  // { -> 'a' umlaut
      '\x7c': '\u00f6',  // | -> 'o' umlaut
      '\x7d': '\u00fc',  // } -> 'u' umlaut
      '\x7e': '\u00fb',  // ~ -> 'u' circumflex
    });
lib.resource.add('hterm/audio/bell', 'audio/ogg;base64',
'T2dnUwACAAAAAAAAAADhqW5KAAAAAMFvEjYBHgF2b3JiaXMAAAAAAYC7AAAAAAAAAHcBAAAAAAC4' +
'AU9nZ1MAAAAAAAAAAAAA4aluSgEAAAAAesI3EC3//////////////////8kDdm9yYmlzHQAAAFhp' +
'cGguT3JnIGxpYlZvcmJpcyBJIDIwMDkwNzA5AAAAAAEFdm9yYmlzKUJDVgEACAAAADFMIMWA0JBV' +
'AAAQAABgJCkOk2ZJKaWUoSh5mJRISSmllMUwiZiUicUYY4wxxhhjjDHGGGOMIDRkFQAABACAKAmO' +
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'IYYYYoghhxxyyCGnnHIKKqigggoyyCCDTDLppJNOOumoo4466ii00EILLbTSSkwx1VZjrr0GXXxz' +
'zjnnnHPOOeecc84JQkNWAQAgAAAEQgYZZBBCCCGFFFKIKaaYcgoyyIDQkFUAACAAgAAAAABHkRRJ' +
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'GIZh+H3f933f930gNGQVACABAKAjOZbjKaIiGqLiOaIDhIasAgBkAAAEACAJkiIpkqNJpmZqrmmb' +
'tmirtm3LsizLsgyEhqwCAAABAAQAAAAAAKBpmqZpmqZpmqZpmqZpmqZpmqZpmmZZlmVZlmVZlmVZ' +
'lmVZlmVZlmVZlmVZlmVZlmVZlmVZlmVZlmVZQGjIKgBAAgBAx3Ecx3EkRVIkx3IsBwgNWQUAyAAA' +
'CABAUizFcjRHczTHczzHczxHdETJlEzN9EwPCA1ZBQAAAgAIAAAAAABAMRzFcRzJ0SRPUi3TcjVX' +
'cz3Xc03XdV1XVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYHQkFUAAAQAACGdZpZq' +
'gAgzkGEgNGQVAIAAAAAYoQhDDAgNWQUAAAQAAIih5CCa0JrzzTkOmuWgqRSb08GJVJsnuamYm3PO' +
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'zQnhnHPOOeecc84555xzzglCQ1YBAEAAAARh2BjGnYIgfY4GYhQhpiGTHnSPDpOgMcgppB6NjkZK' +
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'0xZlUzZd0zVl01Vl1XZl2bZlW7d9WbZ93/d93/d93/d93/d939d1IDRkFQAgAQCgIzmSIimSIjmO' +
'40iSBISGrAIAZAAABACgKI7iOI4jSZIkWZImeZZniZqpmZ7pqaIKhIasAgAAAQAEAAAAAACgaIqn' +
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'yCoAQAIAQEdyJEdyJEVSJEVyJAcIDVkFAMgAAAgAwDEcQ1Ikx7IsTfM0T/M00RM90TM9VXRFFwgN' +
'WQUAAAIACAAAAAAAwJAMS7EczdEkUVIt1VI11VItVVQ9VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV' +
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''
);

lib.resource.add('hterm/concat/date', 'text/plain',
'Fri, 28 Mar 2014 15:50:05 +0000' +
''
);

lib.resource.add('hterm/changelog/version', 'text/plain',
'1.35' +
''
);

lib.resource.add('hterm/changelog/date', 'text/plain',
'2014-03-25' +
''
);

lib.resource.add('hterm/git/HEAD', 'text/plain',
'e1883c2670d32ee4e394b3a6d1e1c18de47f036f' +
''
);