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1352 lines
52 KiB
1352 lines
52 KiB
/*********************************************************************** |
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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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(function () { |
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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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var WHITESPACE_CHARS = array_to_hash(characters(" \n\r\t\u200b")); |
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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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// regexps adapted from http://xregexp.com/plugins/#unicode |
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var UNICODE = { |
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letter: new RegExp("[\\u0041-\\u005A\\u0061-\\u007A\\u00AA\\u00B5\\u00BA\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u0523\\u0531-\\u0556\\u0559\\u0561-\\u0587\\u05D0-\\u05EA\\u05F0-\\u05F2\\u0621-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971\\u0972\\u097B-\\u097F\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C33\\u0C35-\\u0C39\\u0C3D\\u0C58\\u0C59\\u0C60\\u0C61\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0D05-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D28\\u0D2A-\\u0D39\\u0D3D\\u0D60\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E87\\u0E88\\u0E8A\\u0E8D\\u0E94-\\u0E97\\u0E99-\\u0E9F\\u0EA1-\\u0EA3\\u0EA5\\u0EA7\\u0EAA\\u0EAB\\u0EAD-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC\\u0EDD\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8B\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10D0-\\u10FA\\u10FC\\u1100-\\u1159\\u115F-\\u11A2\\u11A8-\\u11F9\\u1200-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F4\\u1401-\\u166C\\u166F-\\u1676\\u1681-\\u169A\\u16A0-\\u16EA\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1877\\u1880-\\u18A8\\u18AA\\u1900-\\u191C\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19A9\\u19C1-\\u19C7\\u1A00-\\u1A16\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u2094\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2119-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u212D\\u212F-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2183\\u2184\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2C6F\\u2C71-\\u2C7D\\u2C80-\\u2CE4\\u2D00-\\u2D25\\u2D30-\\u2D65\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u2E2F\\u3005\\u3006\\u3031-\\u3035\\u303B\\u303C\\u3041-\\u3096\\u309D-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312D\\u3131-\\u318E\\u31A0-\\u31B7\\u31F0-\\u31FF\\u3400\\u4DB5\\u4E00\\u9FC3\\uA000-\\uA48C\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA65F\\uA662-\\uA66E\\uA67F-\\uA697\\uA717-\\uA71F\\uA722-\\uA788\\uA78B\\uA78C\\uA7FB-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA90A-\\uA925\\uA930-\\uA946\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAC00\\uD7A3\\uF900-\\uFA2D\\uFA30-\\uFA6A\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]"), |
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non_spacing_mark: new RegExp("[\\u0300-\\u036F\\u0483-\\u0487\\u0591-\\u05BD\\u05BF\\u05C1\\u05C2\\u05C4\\u05C5\\u05C7\\u0610-\\u061A\\u064B-\\u065E\\u0670\\u06D6-\\u06DC\\u06DF-\\u06E4\\u06E7\\u06E8\\u06EA-\\u06ED\\u0711\\u0730-\\u074A\\u07A6-\\u07B0\\u07EB-\\u07F3\\u0816-\\u0819\\u081B-\\u0823\\u0825-\\u0827\\u0829-\\u082D\\u0900-\\u0902\\u093C\\u0941-\\u0948\\u094D\\u0951-\\u0955\\u0962\\u0963\\u0981\\u09BC\\u09C1-\\u09C4\\u09CD\\u09E2\\u09E3\\u0A01\\u0A02\\u0A3C\\u0A41\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A51\\u0A70\\u0A71\\u0A75\\u0A81\\u0A82\\u0ABC\\u0AC1-\\u0AC5\\u0AC7\\u0AC8\\u0ACD\\u0AE2\\u0AE3\\u0B01\\u0B3C\\u0B3F\\u0B41-\\u0B44\\u0B4D\\u0B56\\u0B62\\u0B63\\u0B82\\u0BC0\\u0BCD\\u0C3E-\\u0C40\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55\\u0C56\\u0C62\\u0C63\\u0CBC\\u0CBF\\u0CC6\\u0CCC\\u0CCD\\u0CE2\\u0CE3\\u0D41-\\u0D44\\u0D4D\\u0D62\\u0D63\\u0DCA\\u0DD2-\\u0DD4\\u0DD6\\u0E31\\u0E34-\\u0E3A\\u0E47-\\u0E4E\\u0EB1\\u0EB4-\\u0EB9\\u0EBB\\u0EBC\\u0EC8-\\u0ECD\\u0F18\\u0F19\\u0F35\\u0F37\\u0F39\\u0F71-\\u0F7E\\u0F80-\\u0F84\\u0F86\\u0F87\\u0F90-\\u0F97\\u0F99-\\u0FBC\\u0FC6\\u102D-\\u1030\\u1032-\\u1037\\u1039\\u103A\\u103D\\u103E\\u1058\\u1059\\u105E-\\u1060\\u1071-\\u1074\\u1082\\u1085\\u1086\\u108D\\u109D\\u135F\\u1712-\\u1714\\u1732-\\u1734\\u1752\\u1753\\u1772\\u1773\\u17B7-\\u17BD\\u17C6\\u17C9-\\u17D3\\u17DD\\u180B-\\u180D\\u18A9\\u1920-\\u1922\\u1927\\u1928\\u1932\\u1939-\\u193B\\u1A17\\u1A18\\u1A56\\u1A58-\\u1A5E\\u1A60\\u1A62\\u1A65-\\u1A6C\\u1A73-\\u1A7C\\u1A7F\\u1B00-\\u1B03\\u1B34\\u1B36-\\u1B3A\\u1B3C\\u1B42\\u1B6B-\\u1B73\\u1B80\\u1B81\\u1BA2-\\u1BA5\\u1BA8\\u1BA9\\u1C2C-\\u1C33\\u1C36\\u1C37\\u1CD0-\\u1CD2\\u1CD4-\\u1CE0\\u1CE2-\\u1CE8\\u1CED\\u1DC0-\\u1DE6\\u1DFD-\\u1DFF\\u20D0-\\u20DC\\u20E1\\u20E5-\\u20F0\\u2CEF-\\u2CF1\\u2DE0-\\u2DFF\\u302A-\\u302F\\u3099\\u309A\\uA66F\\uA67C\\uA67D\\uA6F0\\uA6F1\\uA802\\uA806\\uA80B\\uA825\\uA826\\uA8C4\\uA8E0-\\uA8F1\\uA926-\\uA92D\\uA947-\\uA951\\uA980-\\uA982\\uA9B3\\uA9B6-\\uA9B9\\uA9BC\\uAA29-\\uAA2E\\uAA31\\uAA32\\uAA35\\uAA36\\uAA43\\uAA4C\\uAAB0\\uAAB2-\\uAAB4\\uAAB7\\uAAB8\\uAABE\\uAABF\\uAAC1\\uABE5\\uABE8\\uABED\\uFB1E\\uFE00-\\uFE0F\\uFE20-\\uFE26]"), |
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space_combining_mark: new RegExp("[\\u0903\\u093E-\\u0940\\u0949-\\u094C\\u094E\\u0982\\u0983\\u09BE-\\u09C0\\u09C7\\u09C8\\u09CB\\u09CC\\u09D7\\u0A03\\u0A3E-\\u0A40\\u0A83\\u0ABE-\\u0AC0\\u0AC9\\u0ACB\\u0ACC\\u0B02\\u0B03\\u0B3E\\u0B40\\u0B47\\u0B48\\u0B4B\\u0B4C\\u0B57\\u0BBE\\u0BBF\\u0BC1\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCC\\u0BD7\\u0C01-\\u0C03\\u0C41-\\u0C44\\u0C82\\u0C83\\u0CBE\\u0CC0-\\u0CC4\\u0CC7\\u0CC8\\u0CCA\\u0CCB\\u0CD5\\u0CD6\\u0D02\\u0D03\\u0D3E-\\u0D40\\u0D46-\\u0D48\\u0D4A-\\u0D4C\\u0D57\\u0D82\\u0D83\\u0DCF-\\u0DD1\\u0DD8-\\u0DDF\\u0DF2\\u0DF3\\u0F3E\\u0F3F\\u0F7F\\u102B\\u102C\\u1031\\u1038\\u103B\\u103C\\u1056\\u1057\\u1062-\\u1064\\u1067-\\u106D\\u1083\\u1084\\u1087-\\u108C\\u108F\\u109A-\\u109C\\u17B6\\u17BE-\\u17C5\\u17C7\\u17C8\\u1923-\\u1926\\u1929-\\u192B\\u1930\\u1931\\u1933-\\u1938\\u19B0-\\u19C0\\u19C8\\u19C9\\u1A19-\\u1A1B\\u1A55\\u1A57\\u1A61\\u1A63\\u1A64\\u1A6D-\\u1A72\\u1B04\\u1B35\\u1B3B\\u1B3D-\\u1B41\\u1B43\\u1B44\\u1B82\\u1BA1\\u1BA6\\u1BA7\\u1BAA\\u1C24-\\u1C2B\\u1C34\\u1C35\\u1CE1\\u1CF2\\uA823\\uA824\\uA827\\uA880\\uA881\\uA8B4-\\uA8C3\\uA952\\uA953\\uA983\\uA9B4\\uA9B5\\uA9BA\\uA9BB\\uA9BD-\\uA9C0\\uAA2F\\uAA30\\uAA33\\uAA34\\uAA4D\\uAA7B\\uABE3\\uABE4\\uABE6\\uABE7\\uABE9\\uABEA\\uABEC]"), |
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connector_punctuation: new RegExp("[\\u005F\\u203F\\u2040\\u2054\\uFE33\\uFE34\\uFE4D-\\uFE4F\\uFF3F]") |
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}; |
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|
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function is_letter(ch) { |
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return UNICODE.letter.test(ch); |
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}; |
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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; //XXX: find out if "UnicodeDigit" means something else than 0..9 |
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}; |
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|
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function is_alphanumeric_char(ch) { |
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return is_digit(ch) || is_letter(ch); |
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}; |
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|
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function is_unicode_combining_mark(ch) { |
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return UNICODE.non_spacing_mark.test(ch) || UNICODE.space_combining_mark.test(ch); |
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}; |
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|
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function is_unicode_connector_punctuation(ch) { |
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return UNICODE.connector_punctuation.test(ch); |
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}; |
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|
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function is_identifier_start(ch) { |
|
return ch == "$" || ch == "_" || is_letter(ch); |
|
}; |
|
|
|
function is_identifier_char(ch) { |
|
return is_identifier_start(ch) |
|
|| is_unicode_combining_mark(ch) |
|
|| is_digit(ch) |
|
|| is_unicode_connector_punctuation(ch) |
|
|| ch == "\u200c" // zero-width non-joiner <ZWNJ> |
|
|| ch == "\u200d" // zero-width joiner <ZWJ> (in my ECMA-262 PDF, this is also 200c) |
|
; |
|
}; |
|
|
|
function parse_js_number(num) { |
|
if (RE_HEX_NUMBER.test(num)) { |
|
return parseInt(num.substr(2), 16); |
|
} else if (RE_OCT_NUMBER.test(num)) { |
|
return parseInt(num.substr(1), 8); |
|
} else if (RE_DEC_NUMBER.test(num)) { |
|
return parseFloat(num); |
|
} |
|
}; |
|
|
|
function JS_Parse_Error(message, line, col, pos) { |
|
this.message = message; |
|
this.line = line; |
|
this.col = col; |
|
this.pos = pos; |
|
try { |
|
({})(); |
|
} catch(ex) { |
|
this.stack = ex.stack; |
|
}; |
|
}; |
|
|
|
JS_Parse_Error.prototype.toString = function() { |
|
return this.message + " (line: " + this.line + ", col: " + this.col + ", pos: " + this.pos + ")" + "\n\n" + this.stack; |
|
}; |
|
|
|
function js_error(message, line, col, pos) { |
|
throw new JS_Parse_Error(message, line, col, pos); |
|
}; |
|
|
|
function is_token(token, type, val) { |
|
return token.type == type && (val == null || token.value == val); |
|
}; |
|
|
|
var EX_EOF = {}; |
|
|
|
function tokenizer($TEXT) { |
|
|
|
var S = { |
|
text : $TEXT.replace(/\r\n?|[\n\u2028\u2029]/g, "\n").replace(/^\uFEFF/, ''), |
|
pos : 0, |
|
tokpos : 0, |
|
line : 0, |
|
tokline : 0, |
|
col : 0, |
|
tokcol : 0, |
|
newline_before : false, |
|
regex_allowed : false, |
|
comments_before : [] |
|
}; |
|
|
|
function peek() { return S.text.charAt(S.pos); }; |
|
|
|
function next(signal_eof) { |
|
var ch = S.text.charAt(S.pos++); |
|
if (signal_eof && !ch) |
|
throw EX_EOF; |
|
if (ch == "\n") { |
|
S.newline_before = true; |
|
++S.line; |
|
S.col = 0; |
|
} else { |
|
++S.col; |
|
} |
|
return ch; |
|
}; |
|
|
|
function eof() { |
|
return !S.peek(); |
|
}; |
|
|
|
function find(what, signal_eof) { |
|
var pos = S.text.indexOf(what, S.pos); |
|
if (signal_eof && pos == -1) throw EX_EOF; |
|
return pos; |
|
}; |
|
|
|
function start_token() { |
|
S.tokline = S.line; |
|
S.tokcol = S.col; |
|
S.tokpos = S.pos; |
|
}; |
|
|
|
function token(type, value, is_comment) { |
|
S.regex_allowed = ((type == "operator" && !HOP(UNARY_POSTFIX, value)) || |
|
(type == "keyword" && HOP(KEYWORDS_BEFORE_EXPRESSION, value)) || |
|
(type == "punc" && HOP(PUNC_BEFORE_EXPRESSION, value))); |
|
var ret = { |
|
type : type, |
|
value : value, |
|
line : S.tokline, |
|
col : S.tokcol, |
|
pos : S.tokpos, |
|
nlb : S.newline_before |
|
}; |
|
if (!is_comment) { |
|
ret.comments_before = S.comments_before; |
|
S.comments_before = []; |
|
} |
|
S.newline_before = false; |
|
return ret; |
|
}; |
|
|
|
function skip_whitespace() { |
|
while (HOP(WHITESPACE_CHARS, peek())) |
|
next(); |
|
}; |
|
|
|
function read_while(pred) { |
|
var ret = "", ch = peek(), i = 0; |
|
while (ch && pred(ch, i++)) { |
|
ret += next(); |
|
ch = peek(); |
|
} |
|
return ret; |
|
}; |
|
|
|
function parse_error(err) { |
|
js_error(err, S.tokline, S.tokcol, S.tokpos); |
|
}; |
|
|
|
function read_num(prefix) { |
|
var has_e = false, after_e = false, has_x = false, has_dot = prefix == "."; |
|
var num = read_while(function(ch, i){ |
|
if (ch == "x" || ch == "X") { |
|
if (has_x) return false; |
|
return has_x = true; |
|
} |
|
if (!has_x && (ch == "E" || ch == "e")) { |
|
if (has_e) return false; |
|
return has_e = after_e = true; |
|
} |
|
if (ch == "-") { |
|
if (after_e || (i == 0 && !prefix)) return true; |
|
return false; |
|
} |
|
if (ch == "+") return after_e; |
|
after_e = false; |
|
if (ch == ".") { |
|
if (!has_dot && !has_x) |
|
return has_dot = true; |
|
return false; |
|
} |
|
return is_alphanumeric_char(ch); |
|
}); |
|
if (prefix) |
|
num = prefix + num; |
|
var valid = parse_js_number(num); |
|
if (!isNaN(valid)) { |
|
return token("num", valid); |
|
} else { |
|
parse_error("Invalid syntax: " + num); |
|
} |
|
}; |
|
|
|
function read_escaped_char() { |
|
var ch = next(true); |
|
switch (ch) { |
|
case "n" : return "\n"; |
|
case "r" : return "\r"; |
|
case "t" : return "\t"; |
|
case "b" : return "\b"; |
|
case "v" : return "\v"; |
|
case "f" : return "\f"; |
|
case "0" : return "\0"; |
|
case "x" : return String.fromCharCode(hex_bytes(2)); |
|
case "u" : return String.fromCharCode(hex_bytes(4)); |
|
default : return ch; |
|
} |
|
}; |
|
|
|
function hex_bytes(n) { |
|
var num = 0; |
|
for (; n > 0; --n) { |
|
var digit = parseInt(next(true), 16); |
|
if (isNaN(digit)) |
|
parse_error("Invalid hex-character pattern in string"); |
|
num = (num << 4) | digit; |
|
} |
|
return num; |
|
}; |
|
|
|
function read_string() { |
|
return with_eof_error("Unterminated string constant", function(){ |
|
var quote = next(), ret = ""; |
|
for (;;) { |
|
var ch = next(true); |
|
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; |
|
|
|
// https://github.com/mishoo/UglifyJS/issues/#issue/100 |
|
if (/^@cc_on/i.test(text)) { |
|
warn("WARNING: at line " + S.line); |
|
warn("*** Found \"conditional comment\": " + text); |
|
warn("*** UglifyJS DISCARDS ALL COMMENTS. This means your code might no longer work properly in Internet Explorer."); |
|
} |
|
|
|
return tok; |
|
}); |
|
}; |
|
|
|
function read_name() { |
|
var backslash = false, name = "", ch; |
|
while ((ch = peek()) != null) { |
|
if (!backslash) { |
|
if (ch == "\\") backslash = true, next(); |
|
else if (is_identifier_char(ch)) name += next(); |
|
else break; |
|
} |
|
else { |
|
if (ch != "u") parse_error("Expecting UnicodeEscapeSequence -- uXXXX"); |
|
ch = read_escaped_char(); |
|
if (!is_identifier_char(ch)) parse_error("Unicode char: " + ch.charCodeAt(0) + " is not valid in identifier"); |
|
name += ch; |
|
backslash = false; |
|
} |
|
} |
|
return name; |
|
}; |
|
|
|
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_name(); |
|
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_name(); |
|
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 (ch == "\\" || is_identifier_start(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, exigent_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 !exigent_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 str instanceof NodeWithToken ? str : new NodeWithToken(str, start, end); |
|
}; |
|
|
|
var statement = embed_tokens ? function() { |
|
var start = S.token; |
|
var ast = $statement.apply(this, arguments); |
|
ast[0] = add_tokens(ast[0], start, prev()); |
|
return ast; |
|
} : $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 (exigent_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 init = null; |
|
if (!is("punc", ";")) { |
|
init = is("keyword", "var") |
|
? (next(), var_(true)) |
|
: expression(true, true); |
|
if (is("operator", "in")) |
|
return for_in(init); |
|
} |
|
return regular_for(init); |
|
}; |
|
|
|
function regular_for(init) { |
|
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 for_in(init) { |
|
var lhs = init[0] == "var" ? as("name", init[1][0]) : init; |
|
next(); |
|
var obj = expression(); |
|
expect(")"); |
|
return as("for-in", init, lhs, obj, in_loop(statement)); |
|
}; |
|
|
|
var function_ = embed_tokens ? function() { |
|
var start = prev(); |
|
var ast = $function_.apply(this, arguments); |
|
ast[0] = add_tokens(ast[0], start, prev()); |
|
return ast; |
|
} : $function_; |
|
|
|
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(no_in) { |
|
var a = []; |
|
for (;;) { |
|
if (!is("name")) |
|
unexpected(); |
|
var name = S.token.value; |
|
next(); |
|
if (is("operator", "=")) { |
|
next(); |
|
a.push([ name, expression(false, no_in) ]); |
|
} else { |
|
a.push([ name ]); |
|
} |
|
if (!is("punc", ",")) |
|
break; |
|
next(); |
|
} |
|
return a; |
|
}; |
|
|
|
function var_(no_in) { |
|
return as("var", vardefs(no_in)); |
|
}; |
|
|
|
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("]", !exigent_mode, true)); |
|
}; |
|
|
|
function object_() { |
|
var first = true, a = []; |
|
while (!is("punc", "}")) { |
|
if (first) first = false; else expect(","); |
|
if (!exigent_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, no_in) { |
|
var op = is("operator") ? S.token.value : null; |
|
if (op && op == "in" && no_in) op = null; |
|
var prec = op != null ? PRECEDENCE[op] : null; |
|
if (prec != null && prec > min_prec) { |
|
next(); |
|
var right = expr_op(expr_atom(true), prec, no_in); |
|
return expr_op(as("binary", op, left, right), min_prec, no_in); |
|
} |
|
return left; |
|
}; |
|
|
|
function expr_ops(no_in) { |
|
return expr_op(expr_atom(true), 0, no_in); |
|
}; |
|
|
|
function maybe_conditional(no_in) { |
|
var expr = expr_ops(no_in); |
|
if (is("operator", "?")) { |
|
next(); |
|
var yes = expression(false); |
|
expect(":"); |
|
return as("conditional", expr, yes, expression(false, no_in)); |
|
} |
|
return expr; |
|
}; |
|
|
|
function is_assignable(expr) { |
|
if (!exigent_mode) return true; |
|
switch (expr[0]) { |
|
case "dot": |
|
case "sub": |
|
case "new": |
|
case "call": |
|
return true; |
|
case "name": |
|
return expr[1] != "this"; |
|
} |
|
}; |
|
|
|
function maybe_assign(no_in) { |
|
var left = maybe_conditional(no_in), val = S.token.value; |
|
if (is("operator") && HOP(ASSIGNMENT, val)) { |
|
if (is_assignable(left)) { |
|
next(); |
|
return as("assign", ASSIGNMENT[val], left, maybe_assign(no_in)); |
|
} |
|
croak("Invalid assignment"); |
|
} |
|
return left; |
|
}; |
|
|
|
function expression(commas, no_in) { |
|
if (arguments.length == 0) |
|
commas = true; |
|
var expr = maybe_assign(no_in); |
|
if (commas && is("punc", ",")) { |
|
next(); |
|
return as("seq", expr, expression(true, no_in)); |
|
} |
|
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); |
|
}; |
|
|
|
var warn = function() {}; |
|
|
|
/* -----[ Exports ]----- */ |
|
|
|
var init = function (root) { |
|
if (root.modules["parser"]) { |
|
return; |
|
} |
|
|
|
root.parse = parse; |
|
|
|
root.modules["parser"] = true; |
|
} |
|
|
|
var isCommonJS = (typeof require !== "undefined" && typeof module !== "undefined" && module.exports); |
|
var isAmd = (typeof define !== "undefined" && define.amd); |
|
|
|
if (isCommonJS) { |
|
module.exports.init = init; |
|
} else if (isAmd) { |
|
define("jscex-parser", function () { |
|
return { init: init }; |
|
}); |
|
} else { |
|
if (typeof Jscex === "undefined") { |
|
throw new Error('Missing root object, please load "jscex" module first.'); |
|
} |
|
|
|
init(Jscex); |
|
} |
|
|
|
/* |
|
scope.tokenizer = tokenizer; |
|
scope.parse = parse; |
|
scope.slice = slice; |
|
scope.curry = curry; |
|
scope.member = member; |
|
scope.array_to_hash = array_to_hash; |
|
scope.PRECEDENCE = PRECEDENCE; |
|
scope.KEYWORDS_ATOM = KEYWORDS_ATOM; |
|
scope.RESERVED_WORDS = RESERVED_WORDS; |
|
scope.KEYWORDS = KEYWORDS; |
|
scope.ATOMIC_START_TOKEN = ATOMIC_START_TOKEN; |
|
scope.OPERATORS = OPERATORS; |
|
scope.is_alphanumeric_char = is_alphanumeric_char; |
|
scope.set_logger = function (logger) { |
|
warn = logger; |
|
}; |
|
*/ |
|
|
|
})(); |