// From the top to the bottom:
//
// - A shell line is composed of multiple command lines, first separated by ";" and then chained by "&&" / "||"
// - A command line is composed of multiple commands chained by "|" / "|&"
// - A command is composed of multiple arguments separated by spaces
// - An argument can be a value argument (sent to the underlying program), or a redirection
// - A value argument is a combination of argument segments

export type ArgumentSegment =
  | {type: `text`, text: string}
  | {type: `glob`, pattern: string}
  | {type: `shell`, shell: ShellLine, quoted: boolean}
  | {type: `variable`, name: string, defaultValue?: Array<ValueArgument>, alternativeValue?: Array<ValueArgument>, quoted: boolean}
  | {type: `arithmetic`, arithmetic: ArithmeticExpression};

export type Argument =
  | RedirectArgument
  | ValueArgument;

export type RedirectArgument = {
  type: `redirection`;
  subtype: `>` | `<` | '>&' | '<&' | `>>` | `<<<`;
  fd: number | null;
  args: Array<ValueArgument>;
};

export type ValueArgument =
  | {type: `argument`, segments: Array<ArgumentSegment>};

export type EnvSegment = {
  name: string;
  args: [] | [ValueArgument];
};

export type Command = {
  type: `command`;
  args: Array<Argument>;
  envs: Array<EnvSegment>;
} | {
  type: `subshell`;
  subshell: ShellLine;
  args: Array<RedirectArgument>;
} | {
  type: `group`;
  group: ShellLine;
  args: Array<RedirectArgument>;
} | {
  type: `envs`;
  envs: Array<EnvSegment>;
};

export type CommandChain = Command & {
  then?: CommandChainThen;
};

export type CommandChainThen = {
  type: `|&` | `|`;
  chain: CommandChain;
};

export type CommandLine = {
  chain: CommandChain;
  then?: CommandLineThen;
};

export type CommandLineThen = {
  type: `&&` | `||`;
  line: CommandLine;
};

export type ShellLine = Array<{
  type: ';' | '&';
  command: CommandLine;
}>;

export type ArithmeticPrimary = {
  type: `number`;
  value: number;
} | {
  type: `variable`;
  name: string;
};

export type ArithmeticOperatorExpression = {
  type: `multiplication` | `division` | `addition` | `subtraction`;
  left: ArithmeticExpression;
  right: ArithmeticExpression;
};

export type ArithmeticExpression = ArithmeticPrimary | ArithmeticOperatorExpression;

export declare const parse: (code: string, options: {isGlobPattern: (arg: string) => boolean}) => ShellLine;