1248 lines
41 KiB
JavaScript
1248 lines
41 KiB
JavaScript
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/***********************************************************************
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A JavaScript tokenizer / parser / beautifier / compressor.
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This version is suitable for Node.js. With minimal changes (the
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exports stuff) it should work on any JS platform.
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This file contains the tokenizer/parser. It is a port to JavaScript
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of parse-js [1], a JavaScript parser library written in Common Lisp
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by Marijn Haverbeke. Thank you Marijn!
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[1] http://marijn.haverbeke.nl/parse-js/
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Exported functions:
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- tokenizer(code) -- returns a function. Call the returned
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function to fetch the next token.
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- parse(code) -- returns an AST of the given JavaScript code.
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-------------------------------- (C) ---------------------------------
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Author: Mihai Bazon
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<mihai.bazon@gmail.com>
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http://mihai.bazon.net/blog
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Distributed under the BSD license:
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Copyright 2010 (c) Mihai Bazon <mihai.bazon@gmail.com>
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Based on parse-js (http://marijn.haverbeke.nl/parse-js/).
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the following
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disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials
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provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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***********************************************************************/
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/* -----[ Tokenizer (constants) ]----- */
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var KEYWORDS = array_to_hash([
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"break",
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"case",
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"catch",
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"const",
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"continue",
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"default",
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"delete",
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"do",
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"else",
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"finally",
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"for",
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"function",
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"if",
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"in",
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"instanceof",
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"new",
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"return",
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"switch",
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"throw",
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"try",
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"typeof",
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"var",
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"void",
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"while",
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"with"
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]);
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var RESERVED_WORDS = array_to_hash([
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"abstract",
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"boolean",
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"byte",
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"char",
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"class",
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"debugger",
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"double",
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"enum",
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"export",
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"extends",
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"final",
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"float",
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"goto",
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"implements",
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"import",
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"int",
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"interface",
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"long",
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"native",
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"package",
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"private",
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"protected",
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"public",
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"short",
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"static",
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"super",
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"synchronized",
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"throws",
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"transient",
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"volatile"
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]);
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var KEYWORDS_BEFORE_EXPRESSION = array_to_hash([
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"return",
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"new",
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"delete",
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"throw",
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"else",
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"case"
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]);
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var KEYWORDS_ATOM = array_to_hash([
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"false",
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"null",
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"true",
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"undefined"
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]);
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var OPERATOR_CHARS = array_to_hash(characters("+-*&%=<>!?|~^"));
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var RE_HEX_NUMBER = /^0x[0-9a-f]+$/i;
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var RE_OCT_NUMBER = /^0[0-7]+$/;
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var RE_DEC_NUMBER = /^\d*\.?\d*(?:e[+-]?\d*(?:\d\.?|\.?\d)\d*)?$/i;
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var OPERATORS = array_to_hash([
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"in",
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"instanceof",
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"typeof",
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"new",
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"void",
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"delete",
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"++",
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"--",
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"+",
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"-",
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"!",
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"~",
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"&",
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"|",
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"^",
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"*",
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"/",
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"%",
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">>",
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"<<",
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">>>",
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"<",
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">",
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"<=",
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">=",
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"==",
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"===",
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"!=",
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"!==",
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"?",
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"=",
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"+=",
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"-=",
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"/=",
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"*=",
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"%=",
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">>=",
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"<<=",
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">>>=",
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"%=",
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"|=",
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"^=",
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"&=",
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"&&",
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"||"
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]);
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var WHITESPACE_CHARS = array_to_hash(characters(" \n\r\t"));
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var PUNC_BEFORE_EXPRESSION = array_to_hash(characters("[{}(,.;:"));
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var PUNC_CHARS = array_to_hash(characters("[]{}(),;:"));
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var REGEXP_MODIFIERS = array_to_hash(characters("gmsiy"));
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/* -----[ Tokenizer ]----- */
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function is_alphanumeric_char(ch) {
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ch = ch.charCodeAt(0);
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return (ch >= 48 && ch <= 57) ||
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(ch >= 65 && ch <= 90) ||
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(ch >= 97 && ch <= 122);
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};
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function is_identifier_char(ch) {
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return is_alphanumeric_char(ch) || ch == "$" || ch == "_";
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};
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function is_digit(ch) {
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ch = ch.charCodeAt(0);
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return ch >= 48 && ch <= 57;
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};
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function parse_js_number(num) {
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if (RE_HEX_NUMBER.test(num)) {
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return parseInt(num.substr(2), 16);
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} else if (RE_OCT_NUMBER.test(num)) {
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return parseInt(num.substr(1), 8);
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} else if (RE_DEC_NUMBER.test(num)) {
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return parseFloat(num);
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}
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};
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function JS_Parse_Error(message, line, col, pos) {
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this.message = message;
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this.line = line;
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this.col = col;
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this.pos = pos;
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try {
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({})();
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} catch(ex) {
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this.stack = ex.stack;
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};
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};
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JS_Parse_Error.prototype.toString = function() {
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return this.message + " (line: " + this.line + ", col: " + this.col + ", pos: " + this.pos + ")" + "\n\n" + this.stack;
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};
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function js_error(message, line, col, pos) {
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throw new JS_Parse_Error(message, line, col, pos);
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};
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function is_token(token, type, val) {
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return token.type == type && (val == null || token.value == val);
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};
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var EX_EOF = {};
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function tokenizer($TEXT) {
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var S = {
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text : $TEXT.replace(/\r\n?|[\n\u2028\u2029]/g, "\n").replace(/^\uFEFF/, ''),
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pos : 0,
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tokpos : 0,
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line : 0,
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tokline : 0,
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col : 0,
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tokcol : 0,
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newline_before : false,
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regex_allowed : false,
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comments_before : []
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};
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function peek() { return S.text.charAt(S.pos); };
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function next(signal_eof) {
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var ch = S.text.charAt(S.pos++);
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if (signal_eof && !ch)
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throw EX_EOF;
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if (ch == "\n") {
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S.newline_before = true;
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++S.line;
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S.col = 0;
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} else {
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++S.col;
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}
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return ch;
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};
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function eof() {
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return !S.peek();
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};
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function find(what, signal_eof) {
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var pos = S.text.indexOf(what, S.pos);
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if (signal_eof && pos == -1) throw EX_EOF;
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return pos;
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};
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function start_token() {
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S.tokline = S.line;
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S.tokcol = S.col;
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S.tokpos = S.pos;
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};
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function token(type, value, is_comment) {
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S.regex_allowed = ((type == "operator" && !HOP(UNARY_POSTFIX, value)) ||
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(type == "keyword" && HOP(KEYWORDS_BEFORE_EXPRESSION, value)) ||
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(type == "punc" && HOP(PUNC_BEFORE_EXPRESSION, value)));
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var ret = {
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type : type,
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value : value,
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line : S.tokline,
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col : S.tokcol,
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pos : S.tokpos,
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nlb : S.newline_before
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};
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if (!is_comment) {
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ret.comments_before = S.comments_before;
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S.comments_before = [];
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}
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S.newline_before = false;
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return ret;
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};
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function skip_whitespace() {
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while (HOP(WHITESPACE_CHARS, peek()))
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next();
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};
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function read_while(pred) {
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var ret = "", ch = peek(), i = 0;
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while (ch && pred(ch, i++)) {
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ret += next();
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ch = peek();
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}
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return ret;
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};
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function parse_error(err) {
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js_error(err, S.tokline, S.tokcol, S.tokpos);
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};
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function read_num(prefix) {
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var has_e = false, after_e = false, has_x = false, has_dot = prefix == ".";
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var num = read_while(function(ch, i){
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if (ch == "x" || ch == "X") {
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if (has_x) return false;
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return has_x = true;
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}
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if (!has_x && (ch == "E" || ch == "e")) {
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if (has_e) return false;
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return has_e = after_e = true;
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}
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if (ch == "-") {
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if (after_e || (i == 0 && !prefix)) return true;
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return false;
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}
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if (ch == "+") return after_e;
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after_e = false;
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if (ch == ".") {
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if (!has_dot)
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return has_dot = true;
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return false;
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}
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return is_alphanumeric_char(ch);
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});
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if (prefix)
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num = prefix + num;
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var valid = parse_js_number(num);
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if (!isNaN(valid)) {
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return token("num", valid);
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} else {
|
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parse_error("Invalid syntax: " + num);
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}
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};
|
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function read_escaped_char() {
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var ch = next(true);
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switch (ch) {
|
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case "n" : return "\n";
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case "r" : return "\r";
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case "t" : return "\t";
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case "b" : return "\b";
|
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case "v" : return "\v";
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case "f" : return "\f";
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case "0" : return "\0";
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case "x" : return String.fromCharCode(hex_bytes(2));
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case "u" : return String.fromCharCode(hex_bytes(4));
|
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default : return ch;
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||
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}
|
||
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};
|
||
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|
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function hex_bytes(n) {
|
||
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var num = 0;
|
||
|
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for (; n > 0; --n) {
|
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|
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var digit = parseInt(next(true), 16);
|
||
|
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if (isNaN(digit))
|
||
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parse_error("Invalid hex-character pattern in string");
|
||
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num = (num << 4) | digit;
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||
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}
|
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return num;
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||
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};
|
||
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|
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|
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function read_string() {
|
||
|
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return with_eof_error("Unterminated string constant", function(){
|
||
|
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var quote = next(), ret = "";
|
||
|
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for (;;) {
|
||
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var ch = next(true);
|
||
|
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if (ch == "\\") ch = read_escaped_char();
|
||
|
|
else if (ch == quote) break;
|
||
|
|
ret += ch;
|
||
|
|
}
|
||
|
|
return token("string", ret);
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
function read_line_comment() {
|
||
|
|
next();
|
||
|
|
var i = find("\n"), ret;
|
||
|
|
if (i == -1) {
|
||
|
|
ret = S.text.substr(S.pos);
|
||
|
|
S.pos = S.text.length;
|
||
|
|
} else {
|
||
|
|
ret = S.text.substring(S.pos, i);
|
||
|
|
S.pos = i;
|
||
|
|
}
|
||
|
|
return token("comment1", ret, true);
|
||
|
|
};
|
||
|
|
|
||
|
|
function read_multiline_comment() {
|
||
|
|
next();
|
||
|
|
return with_eof_error("Unterminated multiline comment", function(){
|
||
|
|
var i = find("*/", true),
|
||
|
|
text = S.text.substring(S.pos, i),
|
||
|
|
tok = token("comment2", text, true);
|
||
|
|
S.pos = i + 2;
|
||
|
|
S.line += text.split("\n").length - 1;
|
||
|
|
S.newline_before = text.indexOf("\n") >= 0;
|
||
|
|
return tok;
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
function read_regexp() {
|
||
|
|
return with_eof_error("Unterminated regular expression", function(){
|
||
|
|
var prev_backslash = false, regexp = "", ch, in_class = false;
|
||
|
|
while ((ch = next(true))) if (prev_backslash) {
|
||
|
|
regexp += "\\" + ch;
|
||
|
|
prev_backslash = false;
|
||
|
|
} else if (ch == "[") {
|
||
|
|
in_class = true;
|
||
|
|
regexp += ch;
|
||
|
|
} else if (ch == "]" && in_class) {
|
||
|
|
in_class = false;
|
||
|
|
regexp += ch;
|
||
|
|
} else if (ch == "/" && !in_class) {
|
||
|
|
break;
|
||
|
|
} else if (ch == "\\") {
|
||
|
|
prev_backslash = true;
|
||
|
|
} else {
|
||
|
|
regexp += ch;
|
||
|
|
}
|
||
|
|
var mods = read_while(function(ch){
|
||
|
|
return HOP(REGEXP_MODIFIERS, ch);
|
||
|
|
});
|
||
|
|
return token("regexp", [ regexp, mods ]);
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
function read_operator(prefix) {
|
||
|
|
function grow(op) {
|
||
|
|
if (!peek()) return op;
|
||
|
|
var bigger = op + peek();
|
||
|
|
if (HOP(OPERATORS, bigger)) {
|
||
|
|
next();
|
||
|
|
return grow(bigger);
|
||
|
|
} else {
|
||
|
|
return op;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
return token("operator", grow(prefix || next()));
|
||
|
|
};
|
||
|
|
|
||
|
|
function handle_slash() {
|
||
|
|
next();
|
||
|
|
var regex_allowed = S.regex_allowed;
|
||
|
|
switch (peek()) {
|
||
|
|
case "/":
|
||
|
|
S.comments_before.push(read_line_comment());
|
||
|
|
S.regex_allowed = regex_allowed;
|
||
|
|
return next_token();
|
||
|
|
case "*":
|
||
|
|
S.comments_before.push(read_multiline_comment());
|
||
|
|
S.regex_allowed = regex_allowed;
|
||
|
|
return next_token();
|
||
|
|
}
|
||
|
|
return S.regex_allowed ? read_regexp() : read_operator("/");
|
||
|
|
};
|
||
|
|
|
||
|
|
function handle_dot() {
|
||
|
|
next();
|
||
|
|
return is_digit(peek())
|
||
|
|
? read_num(".")
|
||
|
|
: token("punc", ".");
|
||
|
|
};
|
||
|
|
|
||
|
|
function read_word() {
|
||
|
|
var word = read_while(is_identifier_char);
|
||
|
|
return !HOP(KEYWORDS, word)
|
||
|
|
? token("name", word)
|
||
|
|
: HOP(OPERATORS, word)
|
||
|
|
? token("operator", word)
|
||
|
|
: HOP(KEYWORDS_ATOM, word)
|
||
|
|
? token("atom", word)
|
||
|
|
: token("keyword", word);
|
||
|
|
};
|
||
|
|
|
||
|
|
function with_eof_error(eof_error, cont) {
|
||
|
|
try {
|
||
|
|
return cont();
|
||
|
|
} catch(ex) {
|
||
|
|
if (ex === EX_EOF) parse_error(eof_error);
|
||
|
|
else throw ex;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
function next_token(force_regexp) {
|
||
|
|
if (force_regexp)
|
||
|
|
return read_regexp();
|
||
|
|
skip_whitespace();
|
||
|
|
start_token();
|
||
|
|
var ch = peek();
|
||
|
|
if (!ch) return token("eof");
|
||
|
|
if (is_digit(ch)) return read_num();
|
||
|
|
if (ch == '"' || ch == "'") return read_string();
|
||
|
|
if (HOP(PUNC_CHARS, ch)) return token("punc", next());
|
||
|
|
if (ch == ".") return handle_dot();
|
||
|
|
if (ch == "/") return handle_slash();
|
||
|
|
if (HOP(OPERATOR_CHARS, ch)) return read_operator();
|
||
|
|
if (is_identifier_char(ch)) return read_word();
|
||
|
|
parse_error("Unexpected character '" + ch + "'");
|
||
|
|
};
|
||
|
|
|
||
|
|
next_token.context = function(nc) {
|
||
|
|
if (nc) S = nc;
|
||
|
|
return S;
|
||
|
|
};
|
||
|
|
|
||
|
|
return next_token;
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
/* -----[ Parser (constants) ]----- */
|
||
|
|
|
||
|
|
var UNARY_PREFIX = array_to_hash([
|
||
|
|
"typeof",
|
||
|
|
"void",
|
||
|
|
"delete",
|
||
|
|
"--",
|
||
|
|
"++",
|
||
|
|
"!",
|
||
|
|
"~",
|
||
|
|
"-",
|
||
|
|
"+"
|
||
|
|
]);
|
||
|
|
|
||
|
|
var UNARY_POSTFIX = array_to_hash([ "--", "++" ]);
|
||
|
|
|
||
|
|
var ASSIGNMENT = (function(a, ret, i){
|
||
|
|
while (i < a.length) {
|
||
|
|
ret[a[i]] = a[i].substr(0, a[i].length - 1);
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
})(
|
||
|
|
["+=", "-=", "/=", "*=", "%=", ">>=", "<<=", ">>>=", "|=", "^=", "&="],
|
||
|
|
{ "=": true },
|
||
|
|
0
|
||
|
|
);
|
||
|
|
|
||
|
|
var PRECEDENCE = (function(a, ret){
|
||
|
|
for (var i = 0, n = 1; i < a.length; ++i, ++n) {
|
||
|
|
var b = a[i];
|
||
|
|
for (var j = 0; j < b.length; ++j) {
|
||
|
|
ret[b[j]] = n;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
})(
|
||
|
|
[
|
||
|
|
["||"],
|
||
|
|
["&&"],
|
||
|
|
["|"],
|
||
|
|
["^"],
|
||
|
|
["&"],
|
||
|
|
["==", "===", "!=", "!=="],
|
||
|
|
["<", ">", "<=", ">=", "in", "instanceof"],
|
||
|
|
[">>", "<<", ">>>"],
|
||
|
|
["+", "-"],
|
||
|
|
["*", "/", "%"]
|
||
|
|
],
|
||
|
|
{}
|
||
|
|
);
|
||
|
|
|
||
|
|
var STATEMENTS_WITH_LABELS = array_to_hash([ "for", "do", "while", "switch" ]);
|
||
|
|
|
||
|
|
var ATOMIC_START_TOKEN = array_to_hash([ "atom", "num", "string", "regexp", "name" ]);
|
||
|
|
|
||
|
|
/* -----[ Parser ]----- */
|
||
|
|
|
||
|
|
function NodeWithToken(str, start, end) {
|
||
|
|
this.name = str;
|
||
|
|
this.start = start;
|
||
|
|
this.end = end;
|
||
|
|
};
|
||
|
|
|
||
|
|
NodeWithToken.prototype.toString = function() { return this.name; };
|
||
|
|
|
||
|
|
function parse($TEXT, strict_mode, embed_tokens) {
|
||
|
|
|
||
|
|
var S = {
|
||
|
|
input : typeof $TEXT == "string" ? tokenizer($TEXT, true) : $TEXT,
|
||
|
|
token : null,
|
||
|
|
prev : null,
|
||
|
|
peeked : null,
|
||
|
|
in_function : 0,
|
||
|
|
in_loop : 0,
|
||
|
|
labels : []
|
||
|
|
};
|
||
|
|
|
||
|
|
S.token = next();
|
||
|
|
|
||
|
|
function is(type, value) {
|
||
|
|
return is_token(S.token, type, value);
|
||
|
|
};
|
||
|
|
|
||
|
|
function peek() { return S.peeked || (S.peeked = S.input()); };
|
||
|
|
|
||
|
|
function next() {
|
||
|
|
S.prev = S.token;
|
||
|
|
if (S.peeked) {
|
||
|
|
S.token = S.peeked;
|
||
|
|
S.peeked = null;
|
||
|
|
} else {
|
||
|
|
S.token = S.input();
|
||
|
|
}
|
||
|
|
return S.token;
|
||
|
|
};
|
||
|
|
|
||
|
|
function prev() {
|
||
|
|
return S.prev;
|
||
|
|
};
|
||
|
|
|
||
|
|
function croak(msg, line, col, pos) {
|
||
|
|
var ctx = S.input.context();
|
||
|
|
js_error(msg,
|
||
|
|
line != null ? line : ctx.tokline,
|
||
|
|
col != null ? col : ctx.tokcol,
|
||
|
|
pos != null ? pos : ctx.tokpos);
|
||
|
|
};
|
||
|
|
|
||
|
|
function token_error(token, msg) {
|
||
|
|
croak(msg, token.line, token.col);
|
||
|
|
};
|
||
|
|
|
||
|
|
function unexpected(token) {
|
||
|
|
if (token == null)
|
||
|
|
token = S.token;
|
||
|
|
token_error(token, "Unexpected token: " + token.type + " (" + token.value + ")");
|
||
|
|
};
|
||
|
|
|
||
|
|
function expect_token(type, val) {
|
||
|
|
if (is(type, val)) {
|
||
|
|
return next();
|
||
|
|
}
|
||
|
|
token_error(S.token, "Unexpected token " + S.token.type + ", expected " + type);
|
||
|
|
};
|
||
|
|
|
||
|
|
function expect(punc) { return expect_token("punc", punc); };
|
||
|
|
|
||
|
|
function can_insert_semicolon() {
|
||
|
|
return !strict_mode && (
|
||
|
|
S.token.nlb || is("eof") || is("punc", "}")
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
function semicolon() {
|
||
|
|
if (is("punc", ";")) next();
|
||
|
|
else if (!can_insert_semicolon()) unexpected();
|
||
|
|
};
|
||
|
|
|
||
|
|
function as() {
|
||
|
|
return slice(arguments);
|
||
|
|
};
|
||
|
|
|
||
|
|
function parenthesised() {
|
||
|
|
expect("(");
|
||
|
|
var ex = expression();
|
||
|
|
expect(")");
|
||
|
|
return ex;
|
||
|
|
};
|
||
|
|
|
||
|
|
function add_tokens(str, start, end) {
|
||
|
|
return new NodeWithToken(str, start, end);
|
||
|
|
};
|
||
|
|
|
||
|
|
var statement = embed_tokens ? function() {
|
||
|
|
var start = S.token;
|
||
|
|
var stmt = $statement();
|
||
|
|
stmt[0] = add_tokens(stmt[0], start, prev());
|
||
|
|
return stmt;
|
||
|
|
} : $statement;
|
||
|
|
|
||
|
|
function $statement() {
|
||
|
|
if (is("operator", "/")) {
|
||
|
|
S.peeked = null;
|
||
|
|
S.token = S.input(true); // force regexp
|
||
|
|
}
|
||
|
|
switch (S.token.type) {
|
||
|
|
case "num":
|
||
|
|
case "string":
|
||
|
|
case "regexp":
|
||
|
|
case "operator":
|
||
|
|
case "atom":
|
||
|
|
return simple_statement();
|
||
|
|
|
||
|
|
case "name":
|
||
|
|
return is_token(peek(), "punc", ":")
|
||
|
|
? labeled_statement(prog1(S.token.value, next, next))
|
||
|
|
: simple_statement();
|
||
|
|
|
||
|
|
case "punc":
|
||
|
|
switch (S.token.value) {
|
||
|
|
case "{":
|
||
|
|
return as("block", block_());
|
||
|
|
case "[":
|
||
|
|
case "(":
|
||
|
|
return simple_statement();
|
||
|
|
case ";":
|
||
|
|
next();
|
||
|
|
return as("block");
|
||
|
|
default:
|
||
|
|
unexpected();
|
||
|
|
}
|
||
|
|
|
||
|
|
case "keyword":
|
||
|
|
switch (prog1(S.token.value, next)) {
|
||
|
|
case "break":
|
||
|
|
return break_cont("break");
|
||
|
|
|
||
|
|
case "continue":
|
||
|
|
return break_cont("continue");
|
||
|
|
|
||
|
|
case "debugger":
|
||
|
|
semicolon();
|
||
|
|
return as("debugger");
|
||
|
|
|
||
|
|
case "do":
|
||
|
|
return (function(body){
|
||
|
|
expect_token("keyword", "while");
|
||
|
|
return as("do", prog1(parenthesised, semicolon), body);
|
||
|
|
})(in_loop(statement));
|
||
|
|
|
||
|
|
case "for":
|
||
|
|
return for_();
|
||
|
|
|
||
|
|
case "function":
|
||
|
|
return function_(true);
|
||
|
|
|
||
|
|
case "if":
|
||
|
|
return if_();
|
||
|
|
|
||
|
|
case "return":
|
||
|
|
if (S.in_function == 0)
|
||
|
|
croak("'return' outside of function");
|
||
|
|
return as("return",
|
||
|
|
is("punc", ";")
|
||
|
|
? (next(), null)
|
||
|
|
: can_insert_semicolon()
|
||
|
|
? null
|
||
|
|
: prog1(expression, semicolon));
|
||
|
|
|
||
|
|
case "switch":
|
||
|
|
return as("switch", parenthesised(), switch_block_());
|
||
|
|
|
||
|
|
case "throw":
|
||
|
|
return as("throw", prog1(expression, semicolon));
|
||
|
|
|
||
|
|
case "try":
|
||
|
|
return try_();
|
||
|
|
|
||
|
|
case "var":
|
||
|
|
return prog1(var_, semicolon);
|
||
|
|
|
||
|
|
case "const":
|
||
|
|
return prog1(const_, semicolon);
|
||
|
|
|
||
|
|
case "while":
|
||
|
|
return as("while", parenthesised(), in_loop(statement));
|
||
|
|
|
||
|
|
case "with":
|
||
|
|
return as("with", parenthesised(), statement());
|
||
|
|
|
||
|
|
default:
|
||
|
|
unexpected();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
function labeled_statement(label) {
|
||
|
|
S.labels.push(label);
|
||
|
|
var start = S.token, stat = statement();
|
||
|
|
if (strict_mode && !HOP(STATEMENTS_WITH_LABELS, stat[0]))
|
||
|
|
unexpected(start);
|
||
|
|
S.labels.pop();
|
||
|
|
return as("label", label, stat);
|
||
|
|
};
|
||
|
|
|
||
|
|
function simple_statement() {
|
||
|
|
return as("stat", prog1(expression, semicolon));
|
||
|
|
};
|
||
|
|
|
||
|
|
function break_cont(type) {
|
||
|
|
var name = is("name") ? S.token.value : null;
|
||
|
|
if (name != null) {
|
||
|
|
next();
|
||
|
|
if (!member(name, S.labels))
|
||
|
|
croak("Label " + name + " without matching loop or statement");
|
||
|
|
}
|
||
|
|
else if (S.in_loop == 0)
|
||
|
|
croak(type + " not inside a loop or switch");
|
||
|
|
semicolon();
|
||
|
|
return as(type, name);
|
||
|
|
};
|
||
|
|
|
||
|
|
function for_() {
|
||
|
|
expect("(");
|
||
|
|
var has_var = is("keyword", "var");
|
||
|
|
if (has_var)
|
||
|
|
next();
|
||
|
|
if (is("name") && is_token(peek(), "operator", "in")) {
|
||
|
|
// for (i in foo)
|
||
|
|
var name = S.token.value;
|
||
|
|
next(); next();
|
||
|
|
var obj = expression();
|
||
|
|
expect(")");
|
||
|
|
return as("for-in", has_var, name, obj, in_loop(statement));
|
||
|
|
} else {
|
||
|
|
// classic for
|
||
|
|
var init = is("punc", ";") ? null : has_var ? var_() : expression();
|
||
|
|
expect(";");
|
||
|
|
var test = is("punc", ";") ? null : expression();
|
||
|
|
expect(";");
|
||
|
|
var step = is("punc", ")") ? null : expression();
|
||
|
|
expect(")");
|
||
|
|
return as("for", init, test, step, in_loop(statement));
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
function function_(in_statement) {
|
||
|
|
var name = is("name") ? prog1(S.token.value, next) : null;
|
||
|
|
if (in_statement && !name)
|
||
|
|
unexpected();
|
||
|
|
expect("(");
|
||
|
|
return as(in_statement ? "defun" : "function",
|
||
|
|
name,
|
||
|
|
// arguments
|
||
|
|
(function(first, a){
|
||
|
|
while (!is("punc", ")")) {
|
||
|
|
if (first) first = false; else expect(",");
|
||
|
|
if (!is("name")) unexpected();
|
||
|
|
a.push(S.token.value);
|
||
|
|
next();
|
||
|
|
}
|
||
|
|
next();
|
||
|
|
return a;
|
||
|
|
})(true, []),
|
||
|
|
// body
|
||
|
|
(function(){
|
||
|
|
++S.in_function;
|
||
|
|
var loop = S.in_loop;
|
||
|
|
S.in_loop = 0;
|
||
|
|
var a = block_();
|
||
|
|
--S.in_function;
|
||
|
|
S.in_loop = loop;
|
||
|
|
return a;
|
||
|
|
})());
|
||
|
|
};
|
||
|
|
|
||
|
|
function if_() {
|
||
|
|
var cond = parenthesised(), body = statement(), belse;
|
||
|
|
if (is("keyword", "else")) {
|
||
|
|
next();
|
||
|
|
belse = statement();
|
||
|
|
}
|
||
|
|
return as("if", cond, body, belse);
|
||
|
|
};
|
||
|
|
|
||
|
|
function block_() {
|
||
|
|
expect("{");
|
||
|
|
var a = [];
|
||
|
|
while (!is("punc", "}")) {
|
||
|
|
if (is("eof")) unexpected();
|
||
|
|
a.push(statement());
|
||
|
|
}
|
||
|
|
next();
|
||
|
|
return a;
|
||
|
|
};
|
||
|
|
|
||
|
|
var switch_block_ = curry(in_loop, function(){
|
||
|
|
expect("{");
|
||
|
|
var a = [], cur = null;
|
||
|
|
while (!is("punc", "}")) {
|
||
|
|
if (is("eof")) unexpected();
|
||
|
|
if (is("keyword", "case")) {
|
||
|
|
next();
|
||
|
|
cur = [];
|
||
|
|
a.push([ expression(), cur ]);
|
||
|
|
expect(":");
|
||
|
|
}
|
||
|
|
else if (is("keyword", "default")) {
|
||
|
|
next();
|
||
|
|
expect(":");
|
||
|
|
cur = [];
|
||
|
|
a.push([ null, cur ]);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
if (!cur) unexpected();
|
||
|
|
cur.push(statement());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
next();
|
||
|
|
return a;
|
||
|
|
});
|
||
|
|
|
||
|
|
function try_() {
|
||
|
|
var body = block_(), bcatch, bfinally;
|
||
|
|
if (is("keyword", "catch")) {
|
||
|
|
next();
|
||
|
|
expect("(");
|
||
|
|
if (!is("name"))
|
||
|
|
croak("Name expected");
|
||
|
|
var name = S.token.value;
|
||
|
|
next();
|
||
|
|
expect(")");
|
||
|
|
bcatch = [ name, block_() ];
|
||
|
|
}
|
||
|
|
if (is("keyword", "finally")) {
|
||
|
|
next();
|
||
|
|
bfinally = block_();
|
||
|
|
}
|
||
|
|
if (!bcatch && !bfinally)
|
||
|
|
croak("Missing catch/finally blocks");
|
||
|
|
return as("try", body, bcatch, bfinally);
|
||
|
|
};
|
||
|
|
|
||
|
|
function vardefs() {
|
||
|
|
var a = [];
|
||
|
|
for (;;) {
|
||
|
|
if (!is("name"))
|
||
|
|
unexpected();
|
||
|
|
var name = S.token.value;
|
||
|
|
next();
|
||
|
|
if (is("operator", "=")) {
|
||
|
|
next();
|
||
|
|
a.push([ name, expression(false) ]);
|
||
|
|
} else {
|
||
|
|
a.push([ name ]);
|
||
|
|
}
|
||
|
|
if (!is("punc", ","))
|
||
|
|
break;
|
||
|
|
next();
|
||
|
|
}
|
||
|
|
return a;
|
||
|
|
};
|
||
|
|
|
||
|
|
function var_() {
|
||
|
|
return as("var", vardefs());
|
||
|
|
};
|
||
|
|
|
||
|
|
function const_() {
|
||
|
|
return as("const", vardefs());
|
||
|
|
};
|
||
|
|
|
||
|
|
function new_() {
|
||
|
|
var newexp = expr_atom(false), args;
|
||
|
|
if (is("punc", "(")) {
|
||
|
|
next();
|
||
|
|
args = expr_list(")");
|
||
|
|
} else {
|
||
|
|
args = [];
|
||
|
|
}
|
||
|
|
return subscripts(as("new", newexp, args), true);
|
||
|
|
};
|
||
|
|
|
||
|
|
function expr_atom(allow_calls) {
|
||
|
|
if (is("operator", "new")) {
|
||
|
|
next();
|
||
|
|
return new_();
|
||
|
|
}
|
||
|
|
if (is("operator") && HOP(UNARY_PREFIX, S.token.value)) {
|
||
|
|
return make_unary("unary-prefix",
|
||
|
|
prog1(S.token.value, next),
|
||
|
|
expr_atom(allow_calls));
|
||
|
|
}
|
||
|
|
if (is("punc")) {
|
||
|
|
switch (S.token.value) {
|
||
|
|
case "(":
|
||
|
|
next();
|
||
|
|
return subscripts(prog1(expression, curry(expect, ")")), allow_calls);
|
||
|
|
case "[":
|
||
|
|
next();
|
||
|
|
return subscripts(array_(), allow_calls);
|
||
|
|
case "{":
|
||
|
|
next();
|
||
|
|
return subscripts(object_(), allow_calls);
|
||
|
|
}
|
||
|
|
unexpected();
|
||
|
|
}
|
||
|
|
if (is("keyword", "function")) {
|
||
|
|
next();
|
||
|
|
return subscripts(function_(false), allow_calls);
|
||
|
|
}
|
||
|
|
if (HOP(ATOMIC_START_TOKEN, S.token.type)) {
|
||
|
|
var atom = S.token.type == "regexp"
|
||
|
|
? as("regexp", S.token.value[0], S.token.value[1])
|
||
|
|
: as(S.token.type, S.token.value);
|
||
|
|
return subscripts(prog1(atom, next), allow_calls);
|
||
|
|
}
|
||
|
|
unexpected();
|
||
|
|
};
|
||
|
|
|
||
|
|
function expr_list(closing, allow_trailing_comma, allow_empty) {
|
||
|
|
var first = true, a = [];
|
||
|
|
while (!is("punc", closing)) {
|
||
|
|
if (first) first = false; else expect(",");
|
||
|
|
if (allow_trailing_comma && is("punc", closing)) break;
|
||
|
|
if (is("punc", ",") && allow_empty) {
|
||
|
|
a.push([ "atom", "undefined" ]);
|
||
|
|
} else {
|
||
|
|
a.push(expression(false));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
next();
|
||
|
|
return a;
|
||
|
|
};
|
||
|
|
|
||
|
|
function array_() {
|
||
|
|
return as("array", expr_list("]", !strict_mode, true));
|
||
|
|
};
|
||
|
|
|
||
|
|
function object_() {
|
||
|
|
var first = true, a = [];
|
||
|
|
while (!is("punc", "}")) {
|
||
|
|
if (first) first = false; else expect(",");
|
||
|
|
if (!strict_mode && is("punc", "}"))
|
||
|
|
// allow trailing comma
|
||
|
|
break;
|
||
|
|
var type = S.token.type;
|
||
|
|
var name = as_property_name();
|
||
|
|
if (type == "name" && (name == "get" || name == "set") && !is("punc", ":")) {
|
||
|
|
a.push([ as_name(), function_(false), name ]);
|
||
|
|
} else {
|
||
|
|
expect(":");
|
||
|
|
a.push([ name, expression(false) ]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
next();
|
||
|
|
return as("object", a);
|
||
|
|
};
|
||
|
|
|
||
|
|
function as_property_name() {
|
||
|
|
switch (S.token.type) {
|
||
|
|
case "num":
|
||
|
|
case "string":
|
||
|
|
return prog1(S.token.value, next);
|
||
|
|
}
|
||
|
|
return as_name();
|
||
|
|
};
|
||
|
|
|
||
|
|
function as_name() {
|
||
|
|
switch (S.token.type) {
|
||
|
|
case "name":
|
||
|
|
case "operator":
|
||
|
|
case "keyword":
|
||
|
|
case "atom":
|
||
|
|
return prog1(S.token.value, next);
|
||
|
|
default:
|
||
|
|
unexpected();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
function subscripts(expr, allow_calls) {
|
||
|
|
if (is("punc", ".")) {
|
||
|
|
next();
|
||
|
|
return subscripts(as("dot", expr, as_name()), allow_calls);
|
||
|
|
}
|
||
|
|
if (is("punc", "[")) {
|
||
|
|
next();
|
||
|
|
return subscripts(as("sub", expr, prog1(expression, curry(expect, "]"))), allow_calls);
|
||
|
|
}
|
||
|
|
if (allow_calls && is("punc", "(")) {
|
||
|
|
next();
|
||
|
|
return subscripts(as("call", expr, expr_list(")")), true);
|
||
|
|
}
|
||
|
|
if (allow_calls && is("operator") && HOP(UNARY_POSTFIX, S.token.value)) {
|
||
|
|
return prog1(curry(make_unary, "unary-postfix", S.token.value, expr),
|
||
|
|
next);
|
||
|
|
}
|
||
|
|
return expr;
|
||
|
|
};
|
||
|
|
|
||
|
|
function make_unary(tag, op, expr) {
|
||
|
|
if ((op == "++" || op == "--") && !is_assignable(expr))
|
||
|
|
croak("Invalid use of " + op + " operator");
|
||
|
|
return as(tag, op, expr);
|
||
|
|
};
|
||
|
|
|
||
|
|
function expr_op(left, min_prec) {
|
||
|
|
var op = is("operator") ? S.token.value : null;
|
||
|
|
var prec = op != null ? PRECEDENCE[op] : null;
|
||
|
|
if (prec != null && prec > min_prec) {
|
||
|
|
next();
|
||
|
|
var right = expr_op(expr_atom(true), prec);
|
||
|
|
return expr_op(as("binary", op, left, right), min_prec);
|
||
|
|
}
|
||
|
|
return left;
|
||
|
|
};
|
||
|
|
|
||
|
|
function expr_ops() {
|
||
|
|
return expr_op(expr_atom(true), 0);
|
||
|
|
};
|
||
|
|
|
||
|
|
function maybe_conditional() {
|
||
|
|
var expr = expr_ops();
|
||
|
|
if (is("operator", "?")) {
|
||
|
|
next();
|
||
|
|
var yes = expression(false);
|
||
|
|
expect(":");
|
||
|
|
return as("conditional", expr, yes, expression(false));
|
||
|
|
}
|
||
|
|
return expr;
|
||
|
|
};
|
||
|
|
|
||
|
|
function is_assignable(expr) {
|
||
|
|
switch (expr[0]) {
|
||
|
|
case "dot":
|
||
|
|
case "sub":
|
||
|
|
return true;
|
||
|
|
case "name":
|
||
|
|
return expr[1] != "this";
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
function maybe_assign() {
|
||
|
|
var left = maybe_conditional(), val = S.token.value;
|
||
|
|
if (is("operator") && HOP(ASSIGNMENT, val)) {
|
||
|
|
if (is_assignable(left)) {
|
||
|
|
next();
|
||
|
|
return as("assign", ASSIGNMENT[val], left, maybe_assign());
|
||
|
|
}
|
||
|
|
croak("Invalid assignment");
|
||
|
|
}
|
||
|
|
return left;
|
||
|
|
};
|
||
|
|
|
||
|
|
function expression(commas) {
|
||
|
|
if (arguments.length == 0)
|
||
|
|
commas = true;
|
||
|
|
var expr = maybe_assign();
|
||
|
|
if (commas && is("punc", ",")) {
|
||
|
|
next();
|
||
|
|
return as("seq", expr, expression());
|
||
|
|
}
|
||
|
|
return expr;
|
||
|
|
};
|
||
|
|
|
||
|
|
function in_loop(cont) {
|
||
|
|
try {
|
||
|
|
++S.in_loop;
|
||
|
|
return cont();
|
||
|
|
} finally {
|
||
|
|
--S.in_loop;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
return as("toplevel", (function(a){
|
||
|
|
while (!is("eof"))
|
||
|
|
a.push(statement());
|
||
|
|
return a;
|
||
|
|
})([]));
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
/* -----[ Utilities ]----- */
|
||
|
|
|
||
|
|
function curry(f) {
|
||
|
|
var args = slice(arguments, 1);
|
||
|
|
return function() { return f.apply(this, args.concat(slice(arguments))); };
|
||
|
|
};
|
||
|
|
|
||
|
|
function prog1(ret) {
|
||
|
|
if (ret instanceof Function)
|
||
|
|
ret = ret();
|
||
|
|
for (var i = 1, n = arguments.length; --n > 0; ++i)
|
||
|
|
arguments[i]();
|
||
|
|
return ret;
|
||
|
|
};
|
||
|
|
|
||
|
|
function array_to_hash(a) {
|
||
|
|
var ret = {};
|
||
|
|
for (var i = 0; i < a.length; ++i)
|
||
|
|
ret[a[i]] = true;
|
||
|
|
return ret;
|
||
|
|
};
|
||
|
|
|
||
|
|
function slice(a, start) {
|
||
|
|
return Array.prototype.slice.call(a, start == null ? 0 : start);
|
||
|
|
};
|
||
|
|
|
||
|
|
function characters(str) {
|
||
|
|
return str.split("");
|
||
|
|
};
|
||
|
|
|
||
|
|
function member(name, array) {
|
||
|
|
for (var i = array.length; --i >= 0;)
|
||
|
|
if (array[i] === name)
|
||
|
|
return true;
|
||
|
|
return false;
|
||
|
|
};
|
||
|
|
|
||
|
|
function HOP(obj, prop) {
|
||
|
|
return Object.prototype.hasOwnProperty.call(obj, prop);
|
||
|
|
};
|
||
|
|
|
||
|
|
/* -----[ Exports ]----- */
|
||
|
|
|
||
|
|
exports.tokenizer = tokenizer;
|
||
|
|
exports.parse = parse;
|
||
|
|
exports.slice = slice;
|
||
|
|
exports.curry = curry;
|
||
|
|
exports.member = member;
|
||
|
|
exports.array_to_hash = array_to_hash;
|
||
|
|
exports.PRECEDENCE = PRECEDENCE;
|
||
|
|
exports.KEYWORDS_ATOM = KEYWORDS_ATOM;
|
||
|
|
exports.RESERVED_WORDS = RESERVED_WORDS;
|
||
|
|
exports.KEYWORDS = KEYWORDS;
|
||
|
|
exports.ATOMIC_START_TOKEN = ATOMIC_START_TOKEN;
|
||
|
|
exports.OPERATORS = OPERATORS;
|
||
|
|
exports.is_alphanumeric_char = is_alphanumeric_char;
|
||
|
|
exports.is_identifier_char = is_identifier_char;
|