CLI Tokenizer - feels like bash

cli_tokenizer.js

function tokenize (input) {
	function Token(type, isOpenUntil) {
		this.type = type;
		this.value = "";
		this.isOpenUntil = isOpenUntil || false;
	}

	var i = 0,
		len = input.length,
		tokens = [],
		currentToken = new Token("EMPTY"),
		currentChar;

	function next (type, isOpenUntil) {
		tokens.push(currentToken);
		currentToken = new Token(type, isOpenUntil);
	}

	while (i < len) {
		currentChar = input.charAt(i);
		
		if (currentToken.isOpenUntil) {
			if (currentChar == currentToken.isOpenUntil)
				currentToken.isOpenUntil = false;
			else
				currentToken.value += currentChar;
		} else {
			if (currentChar == "\\") {
				if (currentToken.type != "WORD") next("WORD");
				i++;
				currentToken.value += input.charAt(i);
			} else if (currentChar == "&") {
				if (currentToken.type == "AMP") currentToken.type = "AND";
				else next("AMP");
			} else if (currentChar == "|") {
				if (currentToken.type == "PIPE") currentToken.type = "OR";
				else next("PIPE");
			} else if (currentChar == ">")	next("OUT");
			else if (currentChar == "<")	next("IN");
			else if (currentChar == ";")	next("SEMICOLON");
			else if (currentChar == "\"")	next("STRING", "\"");
			else if (currentChar == "'")	next("STRING", "'");
			else if (currentChar == "(")	next("SUBOPEN");
			else if (currentChar == ")")	next("SUBCLOSE");
			else {
				if (currentToken.type == "WORD")
					currentToken.value += currentChar;
				else {
					next("WORD");
					currentToken.value = currentChar;
				}
			}
		}
		
		i++;
	}

	tokens.push(currentToken); // append current token
	tokens.shift(); // remove empty token

	return tokens;
}

var input = '(true||false)&& echo foo bar \\> > baz | world; echo "bla bla" && \'foo\'';
require("console").log(tokenize(input));

/* result:
[ { type: 'SUBOPEN', value: '', isOpenUntil: false },
  { type: 'WORD', value: 'true', isOpenUntil: false },
  { type: 'OR', value: '', isOpenUntil: false },
  { type: 'WORD', value: 'false', isOpenUntil: false },
  { type: 'SUBCLOSE', value: '', isOpenUntil: false },
  { type: 'AND', value: '', isOpenUntil: false },
  { type: 'WORD', value: ' echo foo bar > ', isOpenUntil: false },
  { type: 'OUT', value: '', isOpenUntil: false },
  { type: 'WORD', value: ' baz ', isOpenUntil: false },
  { type: 'PIPE', value: '', isOpenUntil: false },
  { type: 'WORD', value: ' world', isOpenUntil: false },
  { type: 'SEMICOLON', value: '', isOpenUntil: false },
  { type: 'WORD', value: ' echo ', isOpenUntil: false },
  { type: 'STRING', value: 'bla bla', isOpenUntil: false },
  { type: 'WORD', value: ' ', isOpenUntil: false },
  { type: 'AND', value: '', isOpenUntil: false },
  { type: 'WORD', value: ' ', isOpenUntil: false },
  { type: 'STRING', value: 'foo', isOpenUntil: false } ]*/