スペース区切りのコマンド等をパース

argv.js

var parse = (function () {
	var rs = /\s/, rb = /\\\\/g, re = /\\(?=[\s"'])/g;
	var or = {'"': /\\"/g, "'": /\\'/g};
	return function parse(str) {
		var args = []; var i = 0;
		for (var c; c = str.charAt(i); i++) {
			if (rs.test(c)) continue;
			var v = ''; var b = i;
			do {
				if (c == '\\') { i++; continue; }
				if (rs.test(c)) break;
				if (c == '"' || c == "'") {
					v += str.substring(b, i).replace(re, '');
					b = ++i;
					for (var d; d = str.charAt(i); i++) {
						if (d == '\\') { i++; continue; }
						if (d == c) break;
					}
					v += str.substring(b, i).replace(or[c], c);
					b = i + 1;
				}
			} while (c = str.charAt(++i));
			v += str.substring(b, i).replace(re, '');
			args.push(v.replace(rb, '\\'));
		}
		return args;
	};
})();