2089 lines
51 KiB
PHP
2089 lines
51 KiB
PHP
<?php
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namespace W3TCL\Minify;
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/**
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* JSMinPlus version 1.4
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*
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* Minifies a javascript file using a javascript parser
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*
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* This implements a PHP port of Brendan Eich's Narcissus open source javascript engine (in javascript)
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* References: http://en.wikipedia.org/wiki/Narcissus_(JavaScript_engine)
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* Narcissus sourcecode: http://mxr.mozilla.org/mozilla/source/js/narcissus/
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* JSMinPlus weblog: http://crisp.tweakblogs.net/blog/cat/716
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*
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* Tino Zijdel <crisp@tweakers.net>
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*
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* Usage: $minified = JSMinPlus::minify($script [, $filename])
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*
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* Versionlog (see also changelog.txt):
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* 23-07-2011 - remove dynamic creation of OP_* and KEYWORD_* defines and declare them on top
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* reduce memory footprint by minifying by block-scope
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* some small byte-saving and performance improvements
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* 12-05-2009 - fixed hook:colon precedence, fixed empty body in loop and if-constructs
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* 18-04-2009 - fixed crashbug in PHP 5.2.9 and several other bugfixes
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* 12-04-2009 - some small bugfixes and performance improvements
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* 09-04-2009 - initial open sourced version 1.0
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*
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* Latest version of this script: http://files.tweakers.net/jsminplus/jsminplus.zip
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*
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Narcissus JavaScript engine.
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*
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* The Initial Developer of the Original Code is
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* Brendan Eich <brendan@mozilla.org>.
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s): Tino Zijdel <crisp@tweakers.net>
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* PHP port, modifications and minifier routine are (C) 2009-2011
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK *****
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*/
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define('TOKEN_END', 1);
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define('TOKEN_NUMBER', 2);
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define('TOKEN_IDENTIFIER', 3);
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define('TOKEN_STRING', 4);
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define('TOKEN_REGEXP', 5);
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define('TOKEN_NEWLINE', 6);
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define('TOKEN_CONDCOMMENT_START', 7);
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define('TOKEN_CONDCOMMENT_END', 8);
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define('JS_SCRIPT', 100);
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define('JS_BLOCK', 101);
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define('JS_LABEL', 102);
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define('JS_FOR_IN', 103);
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define('JS_CALL', 104);
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define('JS_NEW_WITH_ARGS', 105);
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define('JS_INDEX', 106);
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define('JS_ARRAY_INIT', 107);
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define('JS_OBJECT_INIT', 108);
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define('JS_PROPERTY_INIT', 109);
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define('JS_GETTER', 110);
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define('JS_SETTER', 111);
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define('JS_GROUP', 112);
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define('JS_LIST', 113);
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define('JS_MINIFIED', 999);
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define('DECLARED_FORM', 0);
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define('EXPRESSED_FORM', 1);
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define('STATEMENT_FORM', 2);
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/* Operators */
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define('OP_SEMICOLON', ';');
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define('OP_COMMA', ',');
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define('OP_HOOK', '?');
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define('OP_COLON', ':');
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define('OP_OR', '||');
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define('OP_AND', '&&');
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define('OP_BITWISE_OR', '|');
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define('OP_BITWISE_XOR', '^');
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define('OP_BITWISE_AND', '&');
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define('OP_STRICT_EQ', '===');
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define('OP_EQ', '==');
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define('OP_ASSIGN', '=');
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define('OP_STRICT_NE', '!==');
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define('OP_NE', '!=');
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define('OP_LSH', '<<');
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define('OP_LE', '<=');
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define('OP_LT', '<');
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define('OP_URSH', '>>>');
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define('OP_RSH', '>>');
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define('OP_GE', '>=');
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define('OP_GT', '>');
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define('OP_INCREMENT', '++');
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define('OP_DECREMENT', '--');
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define('OP_PLUS', '+');
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define('OP_MINUS', '-');
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define('OP_MUL', '*');
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define('OP_DIV', '/');
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define('OP_MOD', '%');
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define('OP_NOT', '!');
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define('OP_BITWISE_NOT', '~');
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define('OP_DOT', '.');
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define('OP_LEFT_BRACKET', '[');
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define('OP_RIGHT_BRACKET', ']');
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define('OP_LEFT_CURLY', '{');
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define('OP_RIGHT_CURLY', '}');
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define('OP_LEFT_PAREN', '(');
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define('OP_RIGHT_PAREN', ')');
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define('OP_CONDCOMMENT_END', '@*/');
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define('OP_UNARY_PLUS', 'U+');
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define('OP_UNARY_MINUS', 'U-');
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/* Keywords */
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define('KEYWORD_BREAK', 'break');
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define('KEYWORD_CASE', 'case');
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define('KEYWORD_CATCH', 'catch');
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define('KEYWORD_CONST', 'const');
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define('KEYWORD_CONTINUE', 'continue');
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define('KEYWORD_DEBUGGER', 'debugger');
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define('KEYWORD_DEFAULT', 'default');
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define('KEYWORD_DELETE', 'delete');
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define('KEYWORD_DO', 'do');
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define('KEYWORD_ELSE', 'else');
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define('KEYWORD_ENUM', 'enum');
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define('KEYWORD_FALSE', 'false');
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define('KEYWORD_FINALLY', 'finally');
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define('KEYWORD_FOR', 'for');
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define('KEYWORD_FUNCTION', 'function');
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define('KEYWORD_IF', 'if');
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define('KEYWORD_IN', 'in');
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define('KEYWORD_INSTANCEOF', 'instanceof');
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define('KEYWORD_NEW', 'new');
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define('KEYWORD_NULL', 'null');
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define('KEYWORD_RETURN', 'return');
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define('KEYWORD_SWITCH', 'switch');
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define('KEYWORD_THIS', 'this');
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define('KEYWORD_THROW', 'throw');
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define('KEYWORD_TRUE', 'true');
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define('KEYWORD_TRY', 'try');
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define('KEYWORD_TYPEOF', 'typeof');
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define('KEYWORD_VAR', 'var');
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define('KEYWORD_VOID', 'void');
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define('KEYWORD_WHILE', 'while');
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define('KEYWORD_WITH', 'with');
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class JSMinPlus
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{
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private $parser;
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private $reserved = array(
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'break', 'case', 'catch', 'continue', 'default', 'delete', 'do',
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'else', 'finally', 'for', 'function', 'if', 'in', 'instanceof',
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'new', 'return', 'switch', 'this', 'throw', 'try', 'typeof', 'var',
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'void', 'while', 'with',
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// Words reserved for future use
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'abstract', 'boolean', 'byte', 'char', 'class', 'const', 'debugger',
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'double', 'enum', 'export', 'extends', 'final', 'float', 'goto',
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'implements', 'import', 'int', 'interface', 'long', 'native',
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'package', 'private', 'protected', 'public', 'short', 'static',
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'super', 'synchronized', 'throws', 'transient', 'volatile',
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// These are not reserved, but should be taken into account
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// in isValidIdentifier (See jslint source code)
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'arguments', 'eval', 'true', 'false', 'Infinity', 'NaN', 'null', 'undefined'
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);
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private function __construct()
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{
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$this->parser = new JSParser($this);
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}
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public static function minify($js, $filename='')
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{
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static $instance;
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// this is a singleton
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if(!$instance)
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$instance = new JSMinPlus();
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return $instance->min($js, $filename);
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}
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private function min($js, $filename)
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{
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try
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{
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$n = $this->parser->parse($js, $filename, 1);
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return $this->parseTree($n);
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}
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catch(\Exception $e)
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{
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echo esc_html( $e->getMessage() ) . '\n';
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}
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return false;
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}
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public function parseTree($n, $noBlockGrouping = false)
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{
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$s = '';
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switch ($n->type)
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{
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case JS_MINIFIED:
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$s = $n->value;
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break;
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case JS_SCRIPT:
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// we do nothing yet with funDecls or varDecls
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$noBlockGrouping = true;
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// FALL THROUGH
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case JS_BLOCK:
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$childs = $n->treeNodes;
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$lastType = 0;
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for ($c = 0, $i = 0, $j = count($childs); $i < $j; $i++)
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{
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$type = $childs[$i]->type;
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$t = $this->parseTree($childs[$i]);
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if (strlen($t))
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{
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if ($c)
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{
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$s = rtrim($s, ';');
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if ($type == KEYWORD_FUNCTION && $childs[$i]->functionForm == DECLARED_FORM)
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{
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// put declared functions on a new line
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$s .= "\n";
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}
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elseif ($type == KEYWORD_VAR && $type == $lastType)
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{
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// mutiple var-statements can go into one
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$t = ',' . substr($t, 4);
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}
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else
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{
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// add terminator
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$s .= ';';
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}
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}
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$s .= $t;
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$c++;
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$lastType = $type;
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}
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}
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if ($c > 1 && !$noBlockGrouping)
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{
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$s = '{' . $s . '}';
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}
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break;
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case KEYWORD_FUNCTION:
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$s .= 'function' . ($n->name ? ' ' . $n->name : '') . '(';
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$params = $n->params;
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for ($i = 0, $j = count($params); $i < $j; $i++)
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$s .= ($i ? ',' : '') . $params[$i];
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$s .= '){' . $this->parseTree($n->body, true) . '}';
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break;
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case KEYWORD_IF:
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$s = 'if(' . $this->parseTree($n->condition) . ')';
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$thenPart = $this->parseTree($n->thenPart);
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$elsePart = $n->elsePart ? $this->parseTree($n->elsePart) : null;
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// empty if-statement
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if ($thenPart == '')
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$thenPart = ';';
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if ($elsePart)
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{
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// be carefull and always make a block out of the thenPart; could be more optimized but is a lot of trouble
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if ($thenPart != ';' && $thenPart[0] != '{')
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$thenPart = '{' . $thenPart . '}';
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$s .= $thenPart . 'else';
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// we could check for more, but that hardly ever applies so go for performance
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if ($elsePart[0] != '{')
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$s .= ' ';
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$s .= $elsePart;
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}
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else
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{
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$s .= $thenPart;
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}
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break;
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case KEYWORD_SWITCH:
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$s = 'switch(' . $this->parseTree($n->discriminant) . '){';
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$cases = $n->cases;
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for ($i = 0, $j = count($cases); $i < $j; $i++)
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{
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$case = $cases[$i];
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if ($case->type == KEYWORD_CASE)
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$s .= 'case' . ($case->caseLabel->type != TOKEN_STRING ? ' ' : '') . $this->parseTree($case->caseLabel) . ':';
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else
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$s .= 'default:';
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$statement = $this->parseTree($case->statements, true);
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if ($statement)
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{
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$s .= $statement;
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// no terminator for last statement
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if ($i + 1 < $j)
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$s .= ';';
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}
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}
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$s .= '}';
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break;
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case KEYWORD_FOR:
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$s = 'for(' . ($n->setup ? $this->parseTree($n->setup) : '')
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. ';' . ($n->condition ? $this->parseTree($n->condition) : '')
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. ';' . ($n->update ? $this->parseTree($n->update) : '') . ')';
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$body = $this->parseTree($n->body);
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if ($body == '')
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$body = ';';
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$s .= $body;
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break;
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case KEYWORD_WHILE:
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$s = 'while(' . $this->parseTree($n->condition) . ')';
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$body = $this->parseTree($n->body);
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if ($body == '')
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$body = ';';
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$s .= $body;
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break;
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case JS_FOR_IN:
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$s = 'for(' . ($n->varDecl ? $this->parseTree($n->varDecl) : $this->parseTree($n->iterator)) . ' in ' . $this->parseTree($n->object) . ')';
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$body = $this->parseTree($n->body);
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if ($body == '')
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$body = ';';
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$s .= $body;
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break;
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case KEYWORD_DO:
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$s = 'do{' . $this->parseTree($n->body, true) . '}while(' . $this->parseTree($n->condition) . ')';
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break;
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case KEYWORD_BREAK:
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case KEYWORD_CONTINUE:
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$s = $n->value . ($n->label ? ' ' . $n->label : '');
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break;
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case KEYWORD_TRY:
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$s = 'try{' . $this->parseTree($n->tryBlock, true) . '}';
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$catchClauses = $n->catchClauses;
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for ($i = 0, $j = count($catchClauses); $i < $j; $i++)
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{
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$t = $catchClauses[$i];
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$s .= 'catch(' . $t->varName . ($t->guard ? ' if ' . $this->parseTree($t->guard) : '') . '){' . $this->parseTree($t->block, true) . '}';
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}
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if ($n->finallyBlock)
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$s .= 'finally{' . $this->parseTree($n->finallyBlock, true) . '}';
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break;
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case KEYWORD_THROW:
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case KEYWORD_RETURN:
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$s = $n->type;
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if ($n->value)
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{
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$t = $this->parseTree($n->value);
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if (strlen($t))
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{
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if ($this->isWordChar($t[0]) || $t[0] == '\\')
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$s .= ' ';
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$s .= $t;
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}
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}
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break;
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case KEYWORD_WITH:
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$s = 'with(' . $this->parseTree($n->object) . ')' . $this->parseTree($n->body);
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break;
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case KEYWORD_VAR:
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case KEYWORD_CONST:
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$s = $n->value . ' ';
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$childs = $n->treeNodes;
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for ($i = 0, $j = count($childs); $i < $j; $i++)
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{
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$t = $childs[$i];
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$s .= ($i ? ',' : '') . $t->name;
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$u = $t->initializer;
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if ($u)
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$s .= '=' . $this->parseTree($u);
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}
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break;
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case KEYWORD_IN:
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case KEYWORD_INSTANCEOF:
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$left = $this->parseTree($n->treeNodes[0]);
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$right = $this->parseTree($n->treeNodes[1]);
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$s = $left;
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if ($this->isWordChar(substr($left, -1)))
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$s .= ' ';
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$s .= $n->type;
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if ($this->isWordChar($right[0]) || $right[0] == '\\')
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$s .= ' ';
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$s .= $right;
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break;
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case KEYWORD_DELETE:
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case KEYWORD_TYPEOF:
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$right = $this->parseTree($n->treeNodes[0]);
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$s = $n->type;
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if ($this->isWordChar($right[0]) || $right[0] == '\\')
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$s .= ' ';
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$s .= $right;
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break;
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case KEYWORD_VOID:
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$s = 'void(' . $this->parseTree($n->treeNodes[0]) . ')';
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break;
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case KEYWORD_DEBUGGER:
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throw new \Exception('NOT IMPLEMENTED: DEBUGGER');
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break;
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case TOKEN_CONDCOMMENT_START:
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case TOKEN_CONDCOMMENT_END:
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$s = $n->value . ($n->type == TOKEN_CONDCOMMENT_START ? ' ' : '');
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$childs = $n->treeNodes;
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for ($i = 0, $j = count($childs); $i < $j; $i++)
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$s .= $this->parseTree($childs[$i]);
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break;
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case OP_SEMICOLON:
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if ($expression = $n->expression)
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$s = $this->parseTree($expression);
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break;
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case JS_LABEL:
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$s = $n->label . ':' . $this->parseTree($n->statement);
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break;
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case OP_COMMA:
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$childs = $n->treeNodes;
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for ($i = 0, $j = count($childs); $i < $j; $i++)
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$s .= ($i ? ',' : '') . $this->parseTree($childs[$i]);
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break;
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case OP_ASSIGN:
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$s = $this->parseTree($n->treeNodes[0]) . $n->value . $this->parseTree($n->treeNodes[1]);
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break;
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case OP_HOOK:
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$s = $this->parseTree($n->treeNodes[0]) . '?' . $this->parseTree($n->treeNodes[1]) . ':' . $this->parseTree($n->treeNodes[2]);
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break;
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|
|
case OP_OR: case OP_AND:
|
|
case OP_BITWISE_OR: case OP_BITWISE_XOR: case OP_BITWISE_AND:
|
|
case OP_EQ: case OP_NE: case OP_STRICT_EQ: case OP_STRICT_NE:
|
|
case OP_LT: case OP_LE: case OP_GE: case OP_GT:
|
|
case OP_LSH: case OP_RSH: case OP_URSH:
|
|
case OP_MUL: case OP_DIV: case OP_MOD:
|
|
$s = $this->parseTree($n->treeNodes[0]) . $n->type . $this->parseTree($n->treeNodes[1]);
|
|
break;
|
|
|
|
case OP_PLUS:
|
|
case OP_MINUS:
|
|
$left = $this->parseTree($n->treeNodes[0]);
|
|
$right = $this->parseTree($n->treeNodes[1]);
|
|
|
|
switch ($n->treeNodes[1]->type)
|
|
{
|
|
case OP_PLUS:
|
|
case OP_MINUS:
|
|
case OP_INCREMENT:
|
|
case OP_DECREMENT:
|
|
case OP_UNARY_PLUS:
|
|
case OP_UNARY_MINUS:
|
|
$s = $left . $n->type . ' ' . $right;
|
|
break;
|
|
|
|
case TOKEN_STRING:
|
|
//combine concatted strings with same quotestyle
|
|
if ($n->type == OP_PLUS && substr($left, -1) == $right[0])
|
|
{
|
|
$s = substr($left, 0, -1) . substr($right, 1);
|
|
break;
|
|
}
|
|
// FALL THROUGH
|
|
|
|
default:
|
|
$s = $left . $n->type . $right;
|
|
}
|
|
break;
|
|
|
|
case OP_NOT:
|
|
case OP_BITWISE_NOT:
|
|
case OP_UNARY_PLUS:
|
|
case OP_UNARY_MINUS:
|
|
$s = $n->value . $this->parseTree($n->treeNodes[0]);
|
|
break;
|
|
|
|
case OP_INCREMENT:
|
|
case OP_DECREMENT:
|
|
if ($n->postfix)
|
|
$s = $this->parseTree($n->treeNodes[0]) . $n->value;
|
|
else
|
|
$s = $n->value . $this->parseTree($n->treeNodes[0]);
|
|
break;
|
|
|
|
case OP_DOT:
|
|
$s = $this->parseTree($n->treeNodes[0]) . '.' . $this->parseTree($n->treeNodes[1]);
|
|
break;
|
|
|
|
case JS_INDEX:
|
|
$s = $this->parseTree($n->treeNodes[0]);
|
|
// See if we can replace named index with a dot saving 3 bytes
|
|
if ( $n->treeNodes[0]->type == TOKEN_IDENTIFIER &&
|
|
$n->treeNodes[1]->type == TOKEN_STRING &&
|
|
$this->isValidIdentifier(substr($n->treeNodes[1]->value, 1, -1))
|
|
)
|
|
$s .= '.' . substr($n->treeNodes[1]->value, 1, -1);
|
|
else
|
|
$s .= '[' . $this->parseTree($n->treeNodes[1]) . ']';
|
|
break;
|
|
|
|
case JS_LIST:
|
|
$childs = $n->treeNodes;
|
|
for ($i = 0, $j = count($childs); $i < $j; $i++)
|
|
$s .= ($i ? ',' : '') . $this->parseTree($childs[$i]);
|
|
break;
|
|
|
|
case JS_CALL:
|
|
$s = $this->parseTree($n->treeNodes[0]) . '(' . $this->parseTree($n->treeNodes[1]) . ')';
|
|
break;
|
|
|
|
case KEYWORD_NEW:
|
|
case JS_NEW_WITH_ARGS:
|
|
$s = 'new ' . $this->parseTree($n->treeNodes[0]) . '(' . ($n->type == JS_NEW_WITH_ARGS ? $this->parseTree($n->treeNodes[1]) : '') . ')';
|
|
break;
|
|
|
|
case JS_ARRAY_INIT:
|
|
$s = '[';
|
|
$childs = $n->treeNodes;
|
|
for ($i = 0, $j = count($childs); $i < $j; $i++)
|
|
{
|
|
$s .= ($i ? ',' : '') . $this->parseTree($childs[$i]);
|
|
}
|
|
$s .= ']';
|
|
break;
|
|
|
|
case JS_OBJECT_INIT:
|
|
$s = '{';
|
|
$childs = $n->treeNodes;
|
|
for ($i = 0, $j = count($childs); $i < $j; $i++)
|
|
{
|
|
$t = $childs[$i];
|
|
if ($i)
|
|
$s .= ',';
|
|
if ($t->type == JS_PROPERTY_INIT)
|
|
{
|
|
// Ditch the quotes when the index is a valid identifier
|
|
if ( $t->treeNodes[0]->type == TOKEN_STRING &&
|
|
$this->isValidIdentifier(substr($t->treeNodes[0]->value, 1, -1))
|
|
)
|
|
$s .= substr($t->treeNodes[0]->value, 1, -1);
|
|
else
|
|
$s .= $t->treeNodes[0]->value;
|
|
|
|
$s .= ':' . $this->parseTree($t->treeNodes[1]);
|
|
}
|
|
else
|
|
{
|
|
$s .= $t->type == JS_GETTER ? 'get' : 'set';
|
|
$s .= ' ' . $t->name . '(';
|
|
$params = $t->params;
|
|
for ($i = 0, $j = count($params); $i < $j; $i++)
|
|
$s .= ($i ? ',' : '') . $params[$i];
|
|
$s .= '){' . $this->parseTree($t->body, true) . '}';
|
|
}
|
|
}
|
|
$s .= '}';
|
|
break;
|
|
|
|
case TOKEN_NUMBER:
|
|
$s = $n->value;
|
|
if (preg_match('/^([1-9]+)(0{3,})$/', $s, $m))
|
|
$s = $m[1] . 'e' . strlen($m[2]);
|
|
break;
|
|
|
|
case KEYWORD_NULL: case KEYWORD_THIS: case KEYWORD_TRUE: case KEYWORD_FALSE:
|
|
case TOKEN_IDENTIFIER: case TOKEN_STRING: case TOKEN_REGEXP:
|
|
$s = $n->value;
|
|
break;
|
|
|
|
case JS_GROUP:
|
|
if (in_array(
|
|
$n->treeNodes[0]->type,
|
|
array(
|
|
JS_ARRAY_INIT, JS_OBJECT_INIT, JS_GROUP,
|
|
TOKEN_NUMBER, TOKEN_STRING, TOKEN_REGEXP, TOKEN_IDENTIFIER,
|
|
KEYWORD_NULL, KEYWORD_THIS, KEYWORD_TRUE, KEYWORD_FALSE
|
|
)
|
|
))
|
|
{
|
|
$s = $this->parseTree($n->treeNodes[0]);
|
|
}
|
|
else
|
|
{
|
|
$s = '(' . $this->parseTree($n->treeNodes[0]) . ')';
|
|
}
|
|
break;
|
|
|
|
default:
|
|
throw new \Exception('UNKNOWN TOKEN TYPE: ' . $n->type);
|
|
}
|
|
|
|
return $s;
|
|
}
|
|
|
|
private function isValidIdentifier($string)
|
|
{
|
|
return preg_match('/^[a-zA-Z_][a-zA-Z0-9_]*$/', $string) && !in_array($string, $this->reserved);
|
|
}
|
|
|
|
private function isWordChar($char)
|
|
{
|
|
return $char == '_' || $char == '$' || ctype_alnum($char);
|
|
}
|
|
}
|
|
|
|
class JSParser
|
|
{
|
|
private $t;
|
|
private $minifier;
|
|
|
|
private $opPrecedence = array(
|
|
';' => 0,
|
|
',' => 1,
|
|
'=' => 2, '?' => 2, ':' => 2,
|
|
// The above all have to have the same precedence, see bug 330975
|
|
'||' => 4,
|
|
'&&' => 5,
|
|
'|' => 6,
|
|
'^' => 7,
|
|
'&' => 8,
|
|
'==' => 9, '!=' => 9, '===' => 9, '!==' => 9,
|
|
'<' => 10, '<=' => 10, '>=' => 10, '>' => 10, 'in' => 10, 'instanceof' => 10,
|
|
'<<' => 11, '>>' => 11, '>>>' => 11,
|
|
'+' => 12, '-' => 12,
|
|
'*' => 13, '/' => 13, '%' => 13,
|
|
'delete' => 14, 'void' => 14, 'typeof' => 14,
|
|
'!' => 14, '~' => 14, 'U+' => 14, 'U-' => 14,
|
|
'++' => 15, '--' => 15,
|
|
'new' => 16,
|
|
'.' => 17,
|
|
JS_NEW_WITH_ARGS => 0, JS_INDEX => 0, JS_CALL => 0,
|
|
JS_ARRAY_INIT => 0, JS_OBJECT_INIT => 0, JS_GROUP => 0
|
|
);
|
|
|
|
private $opArity = array(
|
|
',' => -2,
|
|
'=' => 2,
|
|
'?' => 3,
|
|
'||' => 2,
|
|
'&&' => 2,
|
|
'|' => 2,
|
|
'^' => 2,
|
|
'&' => 2,
|
|
'==' => 2, '!=' => 2, '===' => 2, '!==' => 2,
|
|
'<' => 2, '<=' => 2, '>=' => 2, '>' => 2, 'in' => 2, 'instanceof' => 2,
|
|
'<<' => 2, '>>' => 2, '>>>' => 2,
|
|
'+' => 2, '-' => 2,
|
|
'*' => 2, '/' => 2, '%' => 2,
|
|
'delete' => 1, 'void' => 1, 'typeof' => 1,
|
|
'!' => 1, '~' => 1, 'U+' => 1, 'U-' => 1,
|
|
'++' => 1, '--' => 1,
|
|
'new' => 1,
|
|
'.' => 2,
|
|
JS_NEW_WITH_ARGS => 2, JS_INDEX => 2, JS_CALL => 2,
|
|
JS_ARRAY_INIT => 1, JS_OBJECT_INIT => 1, JS_GROUP => 1,
|
|
TOKEN_CONDCOMMENT_START => 1, TOKEN_CONDCOMMENT_END => 1
|
|
);
|
|
|
|
public function __construct($minifier=null)
|
|
{
|
|
$this->minifier = $minifier;
|
|
$this->t = new JSTokenizer();
|
|
}
|
|
|
|
public function parse($s, $f, $l)
|
|
{
|
|
// initialize tokenizer
|
|
$this->t->init($s, $f, $l);
|
|
|
|
$x = new JSCompilerContext(false);
|
|
$n = $this->Script($x);
|
|
if (!$this->t->isDone())
|
|
throw $this->t->newSyntaxError('Syntax error');
|
|
|
|
return $n;
|
|
}
|
|
|
|
private function Script($x)
|
|
{
|
|
$n = $this->Statements($x);
|
|
$n->type = JS_SCRIPT;
|
|
$n->funDecls = $x->funDecls;
|
|
$n->varDecls = $x->varDecls;
|
|
|
|
// minify by scope
|
|
if ($this->minifier)
|
|
{
|
|
$n->value = $this->minifier->parseTree($n);
|
|
|
|
// clear tree from node to save memory
|
|
$n->treeNodes = null;
|
|
$n->funDecls = null;
|
|
$n->varDecls = null;
|
|
|
|
$n->type = JS_MINIFIED;
|
|
}
|
|
|
|
return $n;
|
|
}
|
|
|
|
private function Statements($x)
|
|
{
|
|
$n = new JSNode($this->t, JS_BLOCK);
|
|
array_push($x->stmtStack, $n);
|
|
|
|
while (!$this->t->isDone() && $this->t->peek() != OP_RIGHT_CURLY)
|
|
$n->addNode($this->Statement($x));
|
|
|
|
array_pop($x->stmtStack);
|
|
|
|
return $n;
|
|
}
|
|
|
|
private function Block($x)
|
|
{
|
|
$this->t->mustMatch(OP_LEFT_CURLY);
|
|
$n = $this->Statements($x);
|
|
$this->t->mustMatch(OP_RIGHT_CURLY);
|
|
|
|
return $n;
|
|
}
|
|
|
|
private function Statement($x)
|
|
{
|
|
$tt = $this->t->get();
|
|
$n2 = null;
|
|
|
|
// Cases for statements ending in a right curly return early, avoiding the
|
|
// common semicolon insertion magic after this switch.
|
|
switch ($tt)
|
|
{
|
|
case KEYWORD_FUNCTION:
|
|
return $this->FunctionDefinition(
|
|
$x,
|
|
true,
|
|
count($x->stmtStack) > 1 ? STATEMENT_FORM : DECLARED_FORM
|
|
);
|
|
break;
|
|
|
|
case OP_LEFT_CURLY:
|
|
$n = $this->Statements($x);
|
|
$this->t->mustMatch(OP_RIGHT_CURLY);
|
|
return $n;
|
|
|
|
case KEYWORD_IF:
|
|
$n = new JSNode($this->t);
|
|
$n->condition = $this->ParenExpression($x);
|
|
array_push($x->stmtStack, $n);
|
|
$n->thenPart = $this->Statement($x);
|
|
$n->elsePart = $this->t->match(KEYWORD_ELSE) ? $this->Statement($x) : null;
|
|
array_pop($x->stmtStack);
|
|
return $n;
|
|
|
|
case KEYWORD_SWITCH:
|
|
$n = new JSNode($this->t);
|
|
$this->t->mustMatch(OP_LEFT_PAREN);
|
|
$n->discriminant = $this->Expression($x);
|
|
$this->t->mustMatch(OP_RIGHT_PAREN);
|
|
$n->cases = array();
|
|
$n->defaultIndex = -1;
|
|
|
|
array_push($x->stmtStack, $n);
|
|
|
|
$this->t->mustMatch(OP_LEFT_CURLY);
|
|
|
|
while (($tt = $this->t->get()) != OP_RIGHT_CURLY)
|
|
{
|
|
switch ($tt)
|
|
{
|
|
case KEYWORD_DEFAULT:
|
|
if ($n->defaultIndex >= 0)
|
|
throw $this->t->newSyntaxError('More than one switch default');
|
|
// FALL THROUGH
|
|
case KEYWORD_CASE:
|
|
$n2 = new JSNode($this->t);
|
|
if ($tt == KEYWORD_DEFAULT)
|
|
$n->defaultIndex = count($n->cases);
|
|
else
|
|
$n2->caseLabel = $this->Expression($x, OP_COLON);
|
|
break;
|
|
default:
|
|
throw $this->t->newSyntaxError('Invalid switch case');
|
|
}
|
|
|
|
$this->t->mustMatch(OP_COLON);
|
|
$n2->statements = new JSNode($this->t, JS_BLOCK);
|
|
while (($tt = $this->t->peek()) != KEYWORD_CASE && $tt != KEYWORD_DEFAULT && $tt != OP_RIGHT_CURLY)
|
|
$n2->statements->addNode($this->Statement($x));
|
|
|
|
array_push($n->cases, $n2);
|
|
}
|
|
|
|
array_pop($x->stmtStack);
|
|
return $n;
|
|
|
|
case KEYWORD_FOR:
|
|
$n = new JSNode($this->t);
|
|
$n->isLoop = true;
|
|
$this->t->mustMatch(OP_LEFT_PAREN);
|
|
|
|
if (($tt = $this->t->peek()) != OP_SEMICOLON)
|
|
{
|
|
$x->inForLoopInit = true;
|
|
if ($tt == KEYWORD_VAR || $tt == KEYWORD_CONST)
|
|
{
|
|
$this->t->get();
|
|
$n2 = $this->Variables($x);
|
|
}
|
|
else
|
|
{
|
|
$n2 = $this->Expression($x);
|
|
}
|
|
$x->inForLoopInit = false;
|
|
}
|
|
|
|
if ($n2 && $this->t->match(KEYWORD_IN))
|
|
{
|
|
$n->type = JS_FOR_IN;
|
|
if ($n2->type == KEYWORD_VAR)
|
|
{
|
|
if (count($n2->treeNodes) != 1)
|
|
{
|
|
throw $this->t->SyntaxError(
|
|
'Invalid for..in left-hand side',
|
|
$this->t->filename,
|
|
$n2->lineno
|
|
);
|
|
}
|
|
|
|
// NB: n2[0].type == IDENTIFIER and n2[0].value == n2[0].name.
|
|
$n->iterator = $n2->treeNodes[0];
|
|
$n->varDecl = $n2;
|
|
}
|
|
else
|
|
{
|
|
$n->iterator = $n2;
|
|
$n->varDecl = null;
|
|
}
|
|
|
|
$n->object = $this->Expression($x);
|
|
}
|
|
else
|
|
{
|
|
$n->setup = $n2 ? $n2 : null;
|
|
$this->t->mustMatch(OP_SEMICOLON);
|
|
$n->condition = $this->t->peek() == OP_SEMICOLON ? null : $this->Expression($x);
|
|
$this->t->mustMatch(OP_SEMICOLON);
|
|
$n->update = $this->t->peek() == OP_RIGHT_PAREN ? null : $this->Expression($x);
|
|
}
|
|
|
|
$this->t->mustMatch(OP_RIGHT_PAREN);
|
|
$n->body = $this->nest($x, $n);
|
|
return $n;
|
|
|
|
case KEYWORD_WHILE:
|
|
$n = new JSNode($this->t);
|
|
$n->isLoop = true;
|
|
$n->condition = $this->ParenExpression($x);
|
|
$n->body = $this->nest($x, $n);
|
|
return $n;
|
|
|
|
case KEYWORD_DO:
|
|
$n = new JSNode($this->t);
|
|
$n->isLoop = true;
|
|
$n->body = $this->nest($x, $n, KEYWORD_WHILE);
|
|
$n->condition = $this->ParenExpression($x);
|
|
if (!$x->ecmaStrictMode)
|
|
{
|
|
// <script language="JavaScript"> (without version hints) may need
|
|
// automatic semicolon insertion without a newline after do-while.
|
|
// See http://bugzilla.mozilla.org/show_bug.cgi?id=238945.
|
|
$this->t->match(OP_SEMICOLON);
|
|
return $n;
|
|
}
|
|
break;
|
|
|
|
case KEYWORD_BREAK:
|
|
case KEYWORD_CONTINUE:
|
|
$n = new JSNode($this->t);
|
|
|
|
if ($this->t->peekOnSameLine() == TOKEN_IDENTIFIER)
|
|
{
|
|
$this->t->get();
|
|
$n->label = $this->t->currentToken()->value;
|
|
}
|
|
|
|
$ss = $x->stmtStack;
|
|
$i = count($ss);
|
|
$label = $n->label;
|
|
if ($label)
|
|
{
|
|
do
|
|
{
|
|
if (--$i < 0)
|
|
throw $this->t->newSyntaxError('Label not found');
|
|
}
|
|
while ($ss[$i]->label != $label);
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
if (--$i < 0)
|
|
throw $this->t->newSyntaxError('Invalid ' . $tt);
|
|
}
|
|
while (!$ss[$i]->isLoop && ($tt != KEYWORD_BREAK || $ss[$i]->type != KEYWORD_SWITCH));
|
|
}
|
|
|
|
$n->target = $ss[$i];
|
|
break;
|
|
|
|
case KEYWORD_TRY:
|
|
$n = new JSNode($this->t);
|
|
$n->tryBlock = $this->Block($x);
|
|
$n->catchClauses = array();
|
|
|
|
while ($this->t->match(KEYWORD_CATCH))
|
|
{
|
|
$n2 = new JSNode($this->t);
|
|
$this->t->mustMatch(OP_LEFT_PAREN);
|
|
$n2->varName = $this->t->mustMatch(TOKEN_IDENTIFIER)->value;
|
|
|
|
if ($this->t->match(KEYWORD_IF))
|
|
{
|
|
if ($x->ecmaStrictMode)
|
|
throw $this->t->newSyntaxError('Illegal catch guard');
|
|
|
|
if (count($n->catchClauses) && !end($n->catchClauses)->guard)
|
|
throw $this->t->newSyntaxError('Guarded catch after unguarded');
|
|
|
|
$n2->guard = $this->Expression($x);
|
|
}
|
|
else
|
|
{
|
|
$n2->guard = null;
|
|
}
|
|
|
|
$this->t->mustMatch(OP_RIGHT_PAREN);
|
|
$n2->block = $this->Block($x);
|
|
array_push($n->catchClauses, $n2);
|
|
}
|
|
|
|
if ($this->t->match(KEYWORD_FINALLY))
|
|
$n->finallyBlock = $this->Block($x);
|
|
|
|
if (!count($n->catchClauses) && !$n->finallyBlock)
|
|
throw $this->t->newSyntaxError('Invalid try statement');
|
|
return $n;
|
|
|
|
case KEYWORD_CATCH:
|
|
case KEYWORD_FINALLY:
|
|
throw $this->t->newSyntaxError($tt + ' without preceding try');
|
|
|
|
case KEYWORD_THROW:
|
|
$n = new JSNode($this->t);
|
|
$n->value = $this->Expression($x);
|
|
break;
|
|
|
|
case KEYWORD_RETURN:
|
|
if (!$x->inFunction)
|
|
throw $this->t->newSyntaxError('Invalid return');
|
|
|
|
$n = new JSNode($this->t);
|
|
$tt = $this->t->peekOnSameLine();
|
|
if ($tt != TOKEN_END && $tt != TOKEN_NEWLINE && $tt != OP_SEMICOLON && $tt != OP_RIGHT_CURLY)
|
|
$n->value = $this->Expression($x);
|
|
else
|
|
$n->value = null;
|
|
break;
|
|
|
|
case KEYWORD_WITH:
|
|
$n = new JSNode($this->t);
|
|
$n->object = $this->ParenExpression($x);
|
|
$n->body = $this->nest($x, $n);
|
|
return $n;
|
|
|
|
case KEYWORD_VAR:
|
|
case KEYWORD_CONST:
|
|
$n = $this->Variables($x);
|
|
break;
|
|
|
|
case TOKEN_CONDCOMMENT_START:
|
|
case TOKEN_CONDCOMMENT_END:
|
|
$n = new JSNode($this->t);
|
|
return $n;
|
|
|
|
case KEYWORD_DEBUGGER:
|
|
$n = new JSNode($this->t);
|
|
break;
|
|
|
|
case TOKEN_NEWLINE:
|
|
case OP_SEMICOLON:
|
|
$n = new JSNode($this->t, OP_SEMICOLON);
|
|
$n->expression = null;
|
|
return $n;
|
|
|
|
default:
|
|
if ($tt == TOKEN_IDENTIFIER)
|
|
{
|
|
$this->t->scanOperand = false;
|
|
$tt = $this->t->peek();
|
|
$this->t->scanOperand = true;
|
|
if ($tt == OP_COLON)
|
|
{
|
|
$label = $this->t->currentToken()->value;
|
|
$ss = $x->stmtStack;
|
|
for ($i = count($ss) - 1; $i >= 0; --$i)
|
|
{
|
|
if ($ss[$i]->label == $label)
|
|
throw $this->t->newSyntaxError('Duplicate label');
|
|
}
|
|
|
|
$this->t->get();
|
|
$n = new JSNode($this->t, JS_LABEL);
|
|
$n->label = $label;
|
|
$n->statement = $this->nest($x, $n);
|
|
|
|
return $n;
|
|
}
|
|
}
|
|
|
|
$n = new JSNode($this->t, OP_SEMICOLON);
|
|
$this->t->unget();
|
|
$n->expression = $this->Expression($x);
|
|
$n->end = $n->expression->end;
|
|
break;
|
|
}
|
|
|
|
if ($this->t->lineno == $this->t->currentToken()->lineno)
|
|
{
|
|
$tt = $this->t->peekOnSameLine();
|
|
if ($tt != TOKEN_END && $tt != TOKEN_NEWLINE && $tt != OP_SEMICOLON && $tt != OP_RIGHT_CURLY)
|
|
throw $this->t->newSyntaxError('Missing ; before statement');
|
|
}
|
|
|
|
$this->t->match(OP_SEMICOLON);
|
|
|
|
return $n;
|
|
}
|
|
|
|
private function FunctionDefinition($x, $requireName, $functionForm)
|
|
{
|
|
$f = new JSNode($this->t);
|
|
|
|
if ($f->type != KEYWORD_FUNCTION)
|
|
$f->type = ($f->value == 'get') ? JS_GETTER : JS_SETTER;
|
|
|
|
if ($this->t->match(TOKEN_IDENTIFIER))
|
|
$f->name = $this->t->currentToken()->value;
|
|
elseif ($requireName)
|
|
throw $this->t->newSyntaxError('Missing function identifier');
|
|
|
|
$this->t->mustMatch(OP_LEFT_PAREN);
|
|
$f->params = array();
|
|
|
|
while (($tt = $this->t->get()) != OP_RIGHT_PAREN)
|
|
{
|
|
if ($tt != TOKEN_IDENTIFIER)
|
|
throw $this->t->newSyntaxError('Missing formal parameter');
|
|
|
|
array_push($f->params, $this->t->currentToken()->value);
|
|
|
|
if ($this->t->peek() != OP_RIGHT_PAREN)
|
|
$this->t->mustMatch(OP_COMMA);
|
|
}
|
|
|
|
$this->t->mustMatch(OP_LEFT_CURLY);
|
|
|
|
$x2 = new JSCompilerContext(true);
|
|
$f->body = $this->Script($x2);
|
|
|
|
$this->t->mustMatch(OP_RIGHT_CURLY);
|
|
$f->end = $this->t->currentToken()->end;
|
|
|
|
$f->functionForm = $functionForm;
|
|
if ($functionForm == DECLARED_FORM)
|
|
array_push($x->funDecls, $f);
|
|
|
|
return $f;
|
|
}
|
|
|
|
private function Variables($x)
|
|
{
|
|
$n = new JSNode($this->t);
|
|
|
|
do
|
|
{
|
|
$this->t->mustMatch(TOKEN_IDENTIFIER);
|
|
|
|
$n2 = new JSNode($this->t);
|
|
$n2->name = $n2->value;
|
|
|
|
if ($this->t->match(OP_ASSIGN))
|
|
{
|
|
if ($this->t->currentToken()->assignOp)
|
|
throw $this->t->newSyntaxError('Invalid variable initialization');
|
|
|
|
$n2->initializer = $this->Expression($x, OP_COMMA);
|
|
}
|
|
|
|
$n2->readOnly = $n->type == KEYWORD_CONST;
|
|
|
|
$n->addNode($n2);
|
|
array_push($x->varDecls, $n2);
|
|
}
|
|
while ($this->t->match(OP_COMMA));
|
|
|
|
return $n;
|
|
}
|
|
|
|
private function Expression($x, $stop=false)
|
|
{
|
|
$operators = array();
|
|
$operands = array();
|
|
$n = false;
|
|
|
|
$bl = $x->bracketLevel;
|
|
$cl = $x->curlyLevel;
|
|
$pl = $x->parenLevel;
|
|
$hl = $x->hookLevel;
|
|
|
|
while (($tt = $this->t->get()) != TOKEN_END)
|
|
{
|
|
if ($tt == $stop &&
|
|
$x->bracketLevel == $bl &&
|
|
$x->curlyLevel == $cl &&
|
|
$x->parenLevel == $pl &&
|
|
$x->hookLevel == $hl
|
|
)
|
|
{
|
|
// Stop only if tt matches the optional stop parameter, and that
|
|
// token is not quoted by some kind of bracket.
|
|
break;
|
|
}
|
|
|
|
switch ($tt)
|
|
{
|
|
case OP_SEMICOLON:
|
|
// NB: cannot be empty, Statement handled that.
|
|
break 2;
|
|
|
|
case OP_HOOK:
|
|
if ($this->t->scanOperand)
|
|
break 2;
|
|
|
|
while ( !empty($operators) &&
|
|
$this->opPrecedence[end($operators)->type] > $this->opPrecedence[$tt]
|
|
)
|
|
$this->reduce($operators, $operands);
|
|
|
|
array_push($operators, new JSNode($this->t));
|
|
|
|
++$x->hookLevel;
|
|
$this->t->scanOperand = true;
|
|
$n = $this->Expression($x);
|
|
|
|
if (!$this->t->match(OP_COLON))
|
|
break 2;
|
|
|
|
--$x->hookLevel;
|
|
array_push($operands, $n);
|
|
break;
|
|
|
|
case OP_COLON:
|
|
if ($x->hookLevel)
|
|
break 2;
|
|
|
|
throw $this->t->newSyntaxError('Invalid label');
|
|
break;
|
|
|
|
case OP_ASSIGN:
|
|
if ($this->t->scanOperand)
|
|
break 2;
|
|
|
|
// Use >, not >=, for right-associative ASSIGN
|
|
while ( !empty($operators) &&
|
|
$this->opPrecedence[end($operators)->type] > $this->opPrecedence[$tt]
|
|
)
|
|
$this->reduce($operators, $operands);
|
|
|
|
array_push($operators, new JSNode($this->t));
|
|
end($operands)->assignOp = $this->t->currentToken()->assignOp;
|
|
$this->t->scanOperand = true;
|
|
break;
|
|
|
|
case KEYWORD_IN:
|
|
// An in operator should not be parsed if we're parsing the head of
|
|
// a for (...) loop, unless it is in the then part of a conditional
|
|
// expression, or parenthesized somehow.
|
|
if ($x->inForLoopInit && !$x->hookLevel &&
|
|
!$x->bracketLevel && !$x->curlyLevel &&
|
|
!$x->parenLevel
|
|
)
|
|
break 2;
|
|
// FALL THROUGH
|
|
case OP_COMMA:
|
|
// A comma operator should not be parsed if we're parsing the then part
|
|
// of a conditional expression unless it's parenthesized somehow.
|
|
if ($tt == OP_COMMA && $x->hookLevel &&
|
|
!$x->bracketLevel && !$x->curlyLevel &&
|
|
!$x->parenLevel
|
|
)
|
|
break 2;
|
|
// Treat comma as left-associative so reduce can fold left-heavy
|
|
// COMMA trees into a single array.
|
|
// FALL THROUGH
|
|
case OP_OR:
|
|
case OP_AND:
|
|
case OP_BITWISE_OR:
|
|
case OP_BITWISE_XOR:
|
|
case OP_BITWISE_AND:
|
|
case OP_EQ: case OP_NE: case OP_STRICT_EQ: case OP_STRICT_NE:
|
|
case OP_LT: case OP_LE: case OP_GE: case OP_GT:
|
|
case KEYWORD_INSTANCEOF:
|
|
case OP_LSH: case OP_RSH: case OP_URSH:
|
|
case OP_PLUS: case OP_MINUS:
|
|
case OP_MUL: case OP_DIV: case OP_MOD:
|
|
case OP_DOT:
|
|
if ($this->t->scanOperand)
|
|
break 2;
|
|
|
|
while ( !empty($operators) &&
|
|
$this->opPrecedence[end($operators)->type] >= $this->opPrecedence[$tt]
|
|
)
|
|
$this->reduce($operators, $operands);
|
|
|
|
if ($tt == OP_DOT)
|
|
{
|
|
$this->t->mustMatch(TOKEN_IDENTIFIER);
|
|
array_push($operands, new JSNode($this->t, OP_DOT, array_pop($operands), new JSNode($this->t)));
|
|
}
|
|
else
|
|
{
|
|
array_push($operators, new JSNode($this->t));
|
|
$this->t->scanOperand = true;
|
|
}
|
|
break;
|
|
|
|
case KEYWORD_DELETE: case KEYWORD_VOID: case KEYWORD_TYPEOF:
|
|
case OP_NOT: case OP_BITWISE_NOT: case OP_UNARY_PLUS: case OP_UNARY_MINUS:
|
|
case KEYWORD_NEW:
|
|
if (!$this->t->scanOperand)
|
|
break 2;
|
|
|
|
array_push($operators, new JSNode($this->t));
|
|
break;
|
|
|
|
case OP_INCREMENT: case OP_DECREMENT:
|
|
if ($this->t->scanOperand)
|
|
{
|
|
array_push($operators, new JSNode($this->t)); // prefix increment or decrement
|
|
}
|
|
else
|
|
{
|
|
// Don't cross a line boundary for postfix {in,de}crement.
|
|
$t = $this->t->tokens[($this->t->tokenIndex + $this->t->lookahead - 1) & 3];
|
|
if ($t && $t->lineno != $this->t->lineno)
|
|
break 2;
|
|
|
|
if (!empty($operators))
|
|
{
|
|
// Use >, not >=, so postfix has higher precedence than prefix.
|
|
while ($this->opPrecedence[end($operators)->type] > $this->opPrecedence[$tt])
|
|
$this->reduce($operators, $operands);
|
|
}
|
|
|
|
$n = new JSNode($this->t, $tt, array_pop($operands));
|
|
$n->postfix = true;
|
|
array_push($operands, $n);
|
|
}
|
|
break;
|
|
|
|
case KEYWORD_FUNCTION:
|
|
if (!$this->t->scanOperand)
|
|
break 2;
|
|
|
|
array_push($operands, $this->FunctionDefinition($x, false, EXPRESSED_FORM));
|
|
$this->t->scanOperand = false;
|
|
break;
|
|
|
|
case KEYWORD_NULL: case KEYWORD_THIS: case KEYWORD_TRUE: case KEYWORD_FALSE:
|
|
case TOKEN_IDENTIFIER: case TOKEN_NUMBER: case TOKEN_STRING: case TOKEN_REGEXP:
|
|
if (!$this->t->scanOperand)
|
|
break 2;
|
|
|
|
array_push($operands, new JSNode($this->t));
|
|
$this->t->scanOperand = false;
|
|
break;
|
|
|
|
case TOKEN_CONDCOMMENT_START:
|
|
case TOKEN_CONDCOMMENT_END:
|
|
if ($this->t->scanOperand)
|
|
array_push($operators, new JSNode($this->t));
|
|
else
|
|
array_push($operands, new JSNode($this->t));
|
|
break;
|
|
|
|
case OP_LEFT_BRACKET:
|
|
if ($this->t->scanOperand)
|
|
{
|
|
// Array initialiser. Parse using recursive descent, as the
|
|
// sub-grammar here is not an operator grammar.
|
|
$n = new JSNode($this->t, JS_ARRAY_INIT);
|
|
while (($tt = $this->t->peek()) != OP_RIGHT_BRACKET)
|
|
{
|
|
if ($tt == OP_COMMA)
|
|
{
|
|
$this->t->get();
|
|
$n->addNode(null);
|
|
continue;
|
|
}
|
|
|
|
$n->addNode($this->Expression($x, OP_COMMA));
|
|
if (!$this->t->match(OP_COMMA))
|
|
break;
|
|
}
|
|
|
|
$this->t->mustMatch(OP_RIGHT_BRACKET);
|
|
array_push($operands, $n);
|
|
$this->t->scanOperand = false;
|
|
}
|
|
else
|
|
{
|
|
// Property indexing operator.
|
|
array_push($operators, new JSNode($this->t, JS_INDEX));
|
|
$this->t->scanOperand = true;
|
|
++$x->bracketLevel;
|
|
}
|
|
break;
|
|
|
|
case OP_RIGHT_BRACKET:
|
|
if ($this->t->scanOperand || $x->bracketLevel == $bl)
|
|
break 2;
|
|
|
|
while ($this->reduce($operators, $operands)->type != JS_INDEX)
|
|
continue;
|
|
|
|
--$x->bracketLevel;
|
|
break;
|
|
|
|
case OP_LEFT_CURLY:
|
|
if (!$this->t->scanOperand)
|
|
break 2;
|
|
|
|
// Object initialiser. As for array initialisers (see above),
|
|
// parse using recursive descent.
|
|
++$x->curlyLevel;
|
|
$n = new JSNode($this->t, JS_OBJECT_INIT);
|
|
while (!$this->t->match(OP_RIGHT_CURLY))
|
|
{
|
|
do
|
|
{
|
|
$tt = $this->t->get();
|
|
$tv = $this->t->currentToken()->value;
|
|
if (($tv == 'get' || $tv == 'set') && $this->t->peek() == TOKEN_IDENTIFIER)
|
|
{
|
|
if ($x->ecmaStrictMode)
|
|
throw $this->t->newSyntaxError('Illegal property accessor');
|
|
|
|
$n->addNode($this->FunctionDefinition($x, true, EXPRESSED_FORM));
|
|
}
|
|
else
|
|
{
|
|
switch ($tt)
|
|
{
|
|
case TOKEN_IDENTIFIER:
|
|
case TOKEN_NUMBER:
|
|
case TOKEN_STRING:
|
|
$id = new JSNode($this->t);
|
|
break;
|
|
|
|
case OP_RIGHT_CURLY:
|
|
if ($x->ecmaStrictMode)
|
|
throw $this->t->newSyntaxError('Illegal trailing ,');
|
|
break 3;
|
|
|
|
default:
|
|
throw $this->t->newSyntaxError('Invalid property name');
|
|
}
|
|
|
|
$this->t->mustMatch(OP_COLON);
|
|
$n->addNode(new JSNode($this->t, JS_PROPERTY_INIT, $id, $this->Expression($x, OP_COMMA)));
|
|
}
|
|
}
|
|
while ($this->t->match(OP_COMMA));
|
|
|
|
$this->t->mustMatch(OP_RIGHT_CURLY);
|
|
break;
|
|
}
|
|
|
|
array_push($operands, $n);
|
|
$this->t->scanOperand = false;
|
|
--$x->curlyLevel;
|
|
break;
|
|
|
|
case OP_RIGHT_CURLY:
|
|
if (!$this->t->scanOperand && $x->curlyLevel != $cl)
|
|
throw new \Exception('PANIC: right curly botch');
|
|
break 2;
|
|
|
|
case OP_LEFT_PAREN:
|
|
if ($this->t->scanOperand)
|
|
{
|
|
array_push($operators, new JSNode($this->t, JS_GROUP));
|
|
}
|
|
else
|
|
{
|
|
while ( !empty($operators) &&
|
|
$this->opPrecedence[end($operators)->type] > $this->opPrecedence[KEYWORD_NEW]
|
|
)
|
|
$this->reduce($operators, $operands);
|
|
|
|
// Handle () now, to regularize the n-ary case for n > 0.
|
|
// We must set scanOperand in case there are arguments and
|
|
// the first one is a regexp or unary+/-.
|
|
$n = end($operators);
|
|
$this->t->scanOperand = true;
|
|
if ($this->t->match(OP_RIGHT_PAREN))
|
|
{
|
|
if ($n && $n->type == KEYWORD_NEW)
|
|
{
|
|
array_pop($operators);
|
|
$n->addNode(array_pop($operands));
|
|
}
|
|
else
|
|
{
|
|
$n = new JSNode($this->t, JS_CALL, array_pop($operands), new JSNode($this->t, JS_LIST));
|
|
}
|
|
|
|
array_push($operands, $n);
|
|
$this->t->scanOperand = false;
|
|
break;
|
|
}
|
|
|
|
if ($n && $n->type == KEYWORD_NEW)
|
|
$n->type = JS_NEW_WITH_ARGS;
|
|
else
|
|
array_push($operators, new JSNode($this->t, JS_CALL));
|
|
}
|
|
|
|
++$x->parenLevel;
|
|
break;
|
|
|
|
case OP_RIGHT_PAREN:
|
|
if ($this->t->scanOperand || $x->parenLevel == $pl)
|
|
break 2;
|
|
|
|
while (($tt = $this->reduce($operators, $operands)->type) != JS_GROUP &&
|
|
$tt != JS_CALL && $tt != JS_NEW_WITH_ARGS
|
|
)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
if ($tt != JS_GROUP)
|
|
{
|
|
$n = end($operands);
|
|
if ($n->treeNodes[1]->type != OP_COMMA)
|
|
$n->treeNodes[1] = new JSNode($this->t, JS_LIST, $n->treeNodes[1]);
|
|
else
|
|
$n->treeNodes[1]->type = JS_LIST;
|
|
}
|
|
|
|
--$x->parenLevel;
|
|
break;
|
|
|
|
// Automatic semicolon insertion means we may scan across a newline
|
|
// and into the beginning of another statement. If so, break out of
|
|
// the while loop and let the t.scanOperand logic handle errors.
|
|
default:
|
|
break 2;
|
|
}
|
|
}
|
|
|
|
if ($x->hookLevel != $hl)
|
|
throw $this->t->newSyntaxError('Missing : in conditional expression');
|
|
|
|
if ($x->parenLevel != $pl)
|
|
throw $this->t->newSyntaxError('Missing ) in parenthetical');
|
|
|
|
if ($x->bracketLevel != $bl)
|
|
throw $this->t->newSyntaxError('Missing ] in index expression');
|
|
|
|
if ($this->t->scanOperand)
|
|
throw $this->t->newSyntaxError('Missing operand');
|
|
|
|
// Resume default mode, scanning for operands, not operators.
|
|
$this->t->scanOperand = true;
|
|
$this->t->unget();
|
|
|
|
while (count($operators))
|
|
$this->reduce($operators, $operands);
|
|
|
|
return array_pop($operands);
|
|
}
|
|
|
|
private function ParenExpression($x)
|
|
{
|
|
$this->t->mustMatch(OP_LEFT_PAREN);
|
|
$n = $this->Expression($x);
|
|
$this->t->mustMatch(OP_RIGHT_PAREN);
|
|
|
|
return $n;
|
|
}
|
|
|
|
// Statement stack and nested statement handler.
|
|
private function nest($x, $node, $end = false)
|
|
{
|
|
array_push($x->stmtStack, $node);
|
|
$n = $this->statement($x);
|
|
array_pop($x->stmtStack);
|
|
|
|
if ($end)
|
|
$this->t->mustMatch($end);
|
|
|
|
return $n;
|
|
}
|
|
|
|
private function reduce(&$operators, &$operands)
|
|
{
|
|
$n = array_pop($operators);
|
|
$op = $n->type;
|
|
$arity = $this->opArity[$op];
|
|
$c = count($operands);
|
|
if ($arity == -2)
|
|
{
|
|
// Flatten left-associative trees
|
|
if ($c >= 2)
|
|
{
|
|
$left = $operands[$c - 2];
|
|
if ($left->type == $op)
|
|
{
|
|
$right = array_pop($operands);
|
|
$left->addNode($right);
|
|
return $left;
|
|
}
|
|
}
|
|
$arity = 2;
|
|
}
|
|
|
|
// Always use push to add operands to n, to update start and end
|
|
$a = array_splice($operands, $c - $arity);
|
|
for ($i = 0; $i < $arity; $i++)
|
|
$n->addNode($a[$i]);
|
|
|
|
// Include closing bracket or postfix operator in [start,end]
|
|
$te = $this->t->currentToken()->end;
|
|
if ($n->end < $te)
|
|
$n->end = $te;
|
|
|
|
array_push($operands, $n);
|
|
|
|
return $n;
|
|
}
|
|
}
|
|
|
|
class JSCompilerContext
|
|
{
|
|
public $inFunction = false;
|
|
public $inForLoopInit = false;
|
|
public $ecmaStrictMode = false;
|
|
public $bracketLevel = 0;
|
|
public $curlyLevel = 0;
|
|
public $parenLevel = 0;
|
|
public $hookLevel = 0;
|
|
|
|
public $stmtStack = array();
|
|
public $funDecls = array();
|
|
public $varDecls = array();
|
|
|
|
public function __construct($inFunction)
|
|
{
|
|
$this->inFunction = $inFunction;
|
|
}
|
|
}
|
|
|
|
class JSNode
|
|
{
|
|
private $type;
|
|
private $value;
|
|
private $lineno;
|
|
private $start;
|
|
private $end;
|
|
|
|
public $treeNodes = array();
|
|
public $funDecls = array();
|
|
public $varDecls = array();
|
|
|
|
public function __construct($t, $type=0)
|
|
{
|
|
if ($token = $t->currentToken())
|
|
{
|
|
$this->type = $type ? $type : $token->type;
|
|
$this->value = $token->value;
|
|
$this->lineno = $token->lineno;
|
|
$this->start = $token->start;
|
|
$this->end = $token->end;
|
|
}
|
|
else
|
|
{
|
|
$this->type = $type;
|
|
$this->lineno = $t->lineno;
|
|
}
|
|
|
|
if (($numargs = func_num_args()) > 2)
|
|
{
|
|
$args = func_get_args();
|
|
for ($i = 2; $i < $numargs; $i++)
|
|
$this->addNode($args[$i]);
|
|
}
|
|
}
|
|
|
|
// we don't want to bloat our object with all kind of specific properties, so we use overloading
|
|
public function __set($name, $value)
|
|
{
|
|
$this->$name = $value;
|
|
}
|
|
|
|
public function __get($name)
|
|
{
|
|
if (isset($this->$name))
|
|
return $this->$name;
|
|
|
|
return null;
|
|
}
|
|
|
|
public function addNode($node)
|
|
{
|
|
if ($node !== null)
|
|
{
|
|
if ($node->start < $this->start)
|
|
$this->start = $node->start;
|
|
if ($this->end < $node->end)
|
|
$this->end = $node->end;
|
|
}
|
|
|
|
$this->treeNodes[] = $node;
|
|
}
|
|
}
|
|
|
|
class JSTokenizer
|
|
{
|
|
private $cursor = 0;
|
|
private $source;
|
|
|
|
public $tokens = array();
|
|
public $tokenIndex = 0;
|
|
public $lookahead = 0;
|
|
public $scanNewlines = false;
|
|
public $scanOperand = true;
|
|
|
|
public $filename;
|
|
public $lineno;
|
|
|
|
private $keywords = array(
|
|
'break',
|
|
'case', 'catch', 'const', 'continue',
|
|
'debugger', 'default', 'delete', 'do',
|
|
'else', 'enum',
|
|
'false', 'finally', 'for', 'function',
|
|
'if', 'in', 'instanceof',
|
|
'new', 'null',
|
|
'return',
|
|
'switch',
|
|
'this', 'throw', 'true', 'try', 'typeof',
|
|
'var', 'void',
|
|
'while', 'with'
|
|
);
|
|
|
|
private $opTypeNames = array(
|
|
';', ',', '?', ':', '||', '&&', '|', '^',
|
|
'&', '===', '==', '=', '!==', '!=', '<<', '<=',
|
|
'<', '>>>', '>>', '>=', '>', '++', '--', '+',
|
|
'-', '*', '/', '%', '!', '~', '.', '[',
|
|
']', '{', '}', '(', ')', '@*/'
|
|
);
|
|
|
|
private $assignOps = array('|', '^', '&', '<<', '>>', '>>>', '+', '-', '*', '/', '%');
|
|
private $opRegExp;
|
|
|
|
public function __construct()
|
|
{
|
|
$this->opRegExp = '#^(' . implode('|', array_map('preg_quote', $this->opTypeNames)) . ')#';
|
|
}
|
|
|
|
public function init($source, $filename = '', $lineno = 1)
|
|
{
|
|
$this->source = $source;
|
|
$this->filename = $filename ? $filename : '[inline]';
|
|
$this->lineno = $lineno;
|
|
|
|
$this->cursor = 0;
|
|
$this->tokens = array();
|
|
$this->tokenIndex = 0;
|
|
$this->lookahead = 0;
|
|
$this->scanNewlines = false;
|
|
$this->scanOperand = true;
|
|
}
|
|
|
|
public function getInput($chunksize)
|
|
{
|
|
if ($chunksize)
|
|
return substr($this->source, $this->cursor, $chunksize);
|
|
|
|
return substr($this->source, $this->cursor);
|
|
}
|
|
|
|
public function isDone()
|
|
{
|
|
return $this->peek() == TOKEN_END;
|
|
}
|
|
|
|
public function match($tt)
|
|
{
|
|
return $this->get() == $tt || $this->unget();
|
|
}
|
|
|
|
public function mustMatch($tt)
|
|
{
|
|
if (!$this->match($tt))
|
|
throw $this->newSyntaxError('Unexpected token; token ' . $tt . ' expected');
|
|
|
|
return $this->currentToken();
|
|
}
|
|
|
|
public function peek()
|
|
{
|
|
if ($this->lookahead)
|
|
{
|
|
$next = $this->tokens[($this->tokenIndex + $this->lookahead) & 3];
|
|
if ($this->scanNewlines && $next->lineno != $this->lineno)
|
|
$tt = TOKEN_NEWLINE;
|
|
else
|
|
$tt = $next->type;
|
|
}
|
|
else
|
|
{
|
|
$tt = $this->get();
|
|
$this->unget();
|
|
}
|
|
|
|
return $tt;
|
|
}
|
|
|
|
public function peekOnSameLine()
|
|
{
|
|
$this->scanNewlines = true;
|
|
$tt = $this->peek();
|
|
$this->scanNewlines = false;
|
|
|
|
return $tt;
|
|
}
|
|
|
|
public function currentToken()
|
|
{
|
|
if (!empty($this->tokens))
|
|
return $this->tokens[$this->tokenIndex];
|
|
}
|
|
|
|
public function get($chunksize = 1000)
|
|
{
|
|
while($this->lookahead)
|
|
{
|
|
$this->lookahead--;
|
|
$this->tokenIndex = ($this->tokenIndex + 1) & 3;
|
|
$token = $this->tokens[$this->tokenIndex];
|
|
if ($token->type != TOKEN_NEWLINE || $this->scanNewlines)
|
|
return $token->type;
|
|
}
|
|
|
|
$conditional_comment = false;
|
|
|
|
// strip whitespace and comments
|
|
while(true)
|
|
{
|
|
$input = $this->getInput($chunksize);
|
|
|
|
// whitespace handling; gobble up \r as well (effectively we don't have support for MAC newlines!)
|
|
$re = $this->scanNewlines ? '/^[ \r\t]+/' : '/^\s+/';
|
|
if (preg_match($re, $input, $match))
|
|
{
|
|
$spaces = $match[0];
|
|
$spacelen = strlen($spaces);
|
|
$this->cursor += $spacelen;
|
|
if (!$this->scanNewlines)
|
|
$this->lineno += substr_count($spaces, "\n");
|
|
|
|
if ($spacelen == $chunksize)
|
|
continue; // complete chunk contained whitespace
|
|
|
|
$input = $this->getInput($chunksize);
|
|
if ($input == '' || $input[0] != '/')
|
|
break;
|
|
}
|
|
|
|
// Comments
|
|
if (!preg_match('/^\/(?:\*(@(?:cc_on|if|elif|else|end))?.*?\*\/|\/[^\n]*)/s', $input, $match))
|
|
{
|
|
if (!$chunksize)
|
|
break;
|
|
|
|
// retry with a full chunk fetch; this also prevents breakage of long regular expressions (which will never match a comment)
|
|
$chunksize = null;
|
|
continue;
|
|
}
|
|
|
|
// check if this is a conditional (JScript) comment
|
|
if (!empty($match[1]))
|
|
{
|
|
$match[0] = '/*' . $match[1];
|
|
$conditional_comment = true;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
$this->cursor += strlen($match[0]);
|
|
$this->lineno += substr_count($match[0], "\n");
|
|
}
|
|
}
|
|
|
|
if ($input == '')
|
|
{
|
|
$tt = TOKEN_END;
|
|
$match = array('');
|
|
}
|
|
elseif ($conditional_comment)
|
|
{
|
|
$tt = TOKEN_CONDCOMMENT_START;
|
|
}
|
|
else
|
|
{
|
|
switch ($input[0])
|
|
{
|
|
case '0':
|
|
// hexadecimal
|
|
if (($input[1] == 'x' || $input[1] == 'X') && preg_match('/^0x[0-9a-f]+/i', $input, $match))
|
|
{
|
|
$tt = TOKEN_NUMBER;
|
|
break;
|
|
}
|
|
// FALL THROUGH
|
|
|
|
case '1': case '2': case '3': case '4': case '5':
|
|
case '6': case '7': case '8': case '9':
|
|
// should always match
|
|
preg_match('/^\d+(?:\.\d*)?(?:[eE][-+]?\d+)?/', $input, $match);
|
|
$tt = TOKEN_NUMBER;
|
|
break;
|
|
|
|
case "'":
|
|
if (preg_match('/^\'(?:[^\\\\\'\r\n]++|\\\\(?:.|\r?\n))*\'/', $input, $match))
|
|
{
|
|
$tt = TOKEN_STRING;
|
|
}
|
|
else
|
|
{
|
|
if ($chunksize)
|
|
return $this->get(null); // retry with a full chunk fetch
|
|
|
|
throw $this->newSyntaxError('Unterminated string literal');
|
|
}
|
|
break;
|
|
|
|
case '"':
|
|
if (preg_match('/^"(?:[^\\\\"\r\n]++|\\\\(?:.|\r?\n))*"/', $input, $match))
|
|
{
|
|
$tt = TOKEN_STRING;
|
|
}
|
|
else
|
|
{
|
|
if ($chunksize)
|
|
return $this->get(null); // retry with a full chunk fetch
|
|
|
|
throw $this->newSyntaxError('Unterminated string literal');
|
|
}
|
|
break;
|
|
|
|
case '/':
|
|
if ($this->scanOperand && preg_match('/^\/((?:\\\\.|\[(?:\\\\.|[^\]])*\]|[^\/])+)\/([gimy]*)/', $input, $match))
|
|
{
|
|
$tt = TOKEN_REGEXP;
|
|
break;
|
|
}
|
|
// FALL THROUGH
|
|
|
|
case '|':
|
|
case '^':
|
|
case '&':
|
|
case '<':
|
|
case '>':
|
|
case '+':
|
|
case '-':
|
|
case '*':
|
|
case '%':
|
|
case '=':
|
|
case '!':
|
|
// should always match
|
|
preg_match($this->opRegExp, $input, $match);
|
|
$op = $match[0];
|
|
if (in_array($op, $this->assignOps) && $input[strlen($op)] == '=')
|
|
{
|
|
$tt = OP_ASSIGN;
|
|
$match[0] .= '=';
|
|
}
|
|
else
|
|
{
|
|
$tt = $op;
|
|
if ($this->scanOperand)
|
|
{
|
|
if ($op == OP_PLUS)
|
|
$tt = OP_UNARY_PLUS;
|
|
elseif ($op == OP_MINUS)
|
|
$tt = OP_UNARY_MINUS;
|
|
}
|
|
$op = null;
|
|
}
|
|
break;
|
|
|
|
case '.':
|
|
if (preg_match('/^\.\d+(?:[eE][-+]?\d+)?/', $input, $match))
|
|
{
|
|
$tt = TOKEN_NUMBER;
|
|
break;
|
|
}
|
|
// FALL THROUGH
|
|
|
|
case ';':
|
|
case ',':
|
|
case '?':
|
|
case ':':
|
|
case '~':
|
|
case '[':
|
|
case ']':
|
|
case '{':
|
|
case '}':
|
|
case '(':
|
|
case ')':
|
|
// these are all single
|
|
$match = array($input[0]);
|
|
$tt = $input[0];
|
|
break;
|
|
|
|
case '@':
|
|
// check end of conditional comment
|
|
if (substr($input, 0, 3) == '@*/')
|
|
{
|
|
$match = array('@*/');
|
|
$tt = TOKEN_CONDCOMMENT_END;
|
|
}
|
|
else
|
|
throw $this->newSyntaxError('Illegal token');
|
|
break;
|
|
|
|
case "\n":
|
|
if ($this->scanNewlines)
|
|
{
|
|
$match = array("\n");
|
|
$tt = TOKEN_NEWLINE;
|
|
}
|
|
else
|
|
throw $this->newSyntaxError('Illegal token');
|
|
break;
|
|
|
|
default:
|
|
// FIXME: add support for unicode and unicode escape sequence \uHHHH
|
|
if (preg_match('/^[$\w]+/', $input, $match))
|
|
{
|
|
$tt = in_array($match[0], $this->keywords) ? $match[0] : TOKEN_IDENTIFIER;
|
|
}
|
|
else
|
|
throw $this->newSyntaxError('Illegal token');
|
|
}
|
|
}
|
|
|
|
$this->tokenIndex = ($this->tokenIndex + 1) & 3;
|
|
|
|
if (!isset($this->tokens[$this->tokenIndex]))
|
|
$this->tokens[$this->tokenIndex] = new JSToken();
|
|
|
|
$token = $this->tokens[$this->tokenIndex];
|
|
$token->type = $tt;
|
|
|
|
if ($tt == OP_ASSIGN)
|
|
$token->assignOp = $op;
|
|
|
|
$token->start = $this->cursor;
|
|
|
|
$token->value = $match[0];
|
|
$this->cursor += strlen($match[0]);
|
|
|
|
$token->end = $this->cursor;
|
|
$token->lineno = $this->lineno;
|
|
|
|
return $tt;
|
|
}
|
|
|
|
public function unget()
|
|
{
|
|
if (++$this->lookahead == 4)
|
|
throw $this->newSyntaxError('PANIC: too much lookahead!');
|
|
|
|
$this->tokenIndex = ($this->tokenIndex - 1) & 3;
|
|
}
|
|
|
|
public function newSyntaxError($m)
|
|
{
|
|
return new \Exception('Parse error: ' . $m . ' in file \'' . $this->filename . '\' on line ' . $this->lineno);
|
|
}
|
|
}
|
|
|
|
class JSToken
|
|
{
|
|
public $type;
|
|
public $value;
|
|
public $start;
|
|
public $end;
|
|
public $lineno;
|
|
public $assignOp;
|
|
}
|