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446 lines
11 KiB
446 lines
11 KiB
10 months ago
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<?php
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/**
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* Copyright © 2024 ExacTI Technology Solutions. All rights reserved.
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* GPLv3 General License.
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* https://exacti.com.br
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* Phacil PHP Framework - https://github.com/exacti/phacil-framework
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*/
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namespace Phacil\Framework\ECompress\Helpers\JSMinPlus;
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use Phacil\Framework\Exception;
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use Phacil\Framework\ECompress\Helpers\JSMinPlus\JSToken;
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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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class JSTokenizer
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{
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private $cursor = 0;
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private $source;
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public $tokens = array();
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public $tokenIndex = 0;
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public $lookahead = 0;
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public $scanNewlines = false;
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public $scanOperand = true;
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public $filename;
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public $lineno;
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private $keywords = array(
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'break',
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'case', 'catch', 'const', 'continue',
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'debugger', 'default', 'delete', 'do',
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'else', 'enum',
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'false', 'finally', 'for', 'function',
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'if', 'in', 'instanceof',
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'new', 'null',
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'return',
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'switch',
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'this', 'throw', 'true', 'try', 'typeof',
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'var', 'void',
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'while', 'with'
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);
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private $opTypeNames = array(
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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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private $assignOps = array('|', '^', '&', '<<', '>>', '>>>', '+', '-', '*', '/', '%');
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private $opRegExp;
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public function __construct()
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{
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$this->opRegExp = '#^(' . implode('|', array_map('preg_quote', $this->opTypeNames)) . ')#';
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}
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public function init($source, $filename = '', $lineno = 1)
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{
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$this->source = $source;
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$this->filename = $filename ? $filename : '[inline]';
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$this->lineno = $lineno;
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$this->cursor = 0;
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$this->tokens = array();
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$this->tokenIndex = 0;
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$this->lookahead = 0;
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$this->scanNewlines = false;
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$this->scanOperand = true;
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}
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public function getInput($chunksize)
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{
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if ($chunksize)
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return substr($this->source, $this->cursor, $chunksize);
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return substr($this->source, $this->cursor);
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}
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public function isDone()
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{
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return $this->peek() == TOKEN_END;
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}
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public function match($tt)
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{
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return $this->get() == $tt || $this->unget();
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}
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public function mustMatch($tt)
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{
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if (!$this->match($tt))
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throw $this->newSyntaxError('Unexpected token; token ' . $tt . ' expected');
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return $this->currentToken();
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}
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public function peek()
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{
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if ($this->lookahead)
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{
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$next = $this->tokens[($this->tokenIndex + $this->lookahead) & 3];
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if ($this->scanNewlines && $next->lineno != $this->lineno)
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$tt = TOKEN_NEWLINE;
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else
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$tt = $next->type;
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}
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else
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{
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$tt = $this->get();
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$this->unget();
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}
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return $tt;
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}
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public function peekOnSameLine()
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{
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$this->scanNewlines = true;
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$tt = $this->peek();
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$this->scanNewlines = false;
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return $tt;
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}
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public function currentToken()
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{
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if (!empty($this->tokens))
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return $this->tokens[$this->tokenIndex];
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}
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public function get($chunksize = 1000)
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{
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while($this->lookahead)
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{
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$this->lookahead--;
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$this->tokenIndex = ($this->tokenIndex + 1) & 3;
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$token = $this->tokens[$this->tokenIndex];
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if ($token->type != TOKEN_NEWLINE || $this->scanNewlines)
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return $token->type;
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}
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$conditional_comment = false;
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// strip whitespace and comments
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while(true)
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{
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$input = $this->getInput($chunksize);
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// whitespace handling; gobble up \r as well (effectively we don't have support for MAC newlines!)
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$re = $this->scanNewlines ? '/^[ \r\t]+/' : '/^\s+/';
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if (preg_match($re, $input, $match))
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{
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$spaces = $match[0];
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$spacelen = strlen($spaces);
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$this->cursor += $spacelen;
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if (!$this->scanNewlines)
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$this->lineno += substr_count($spaces, "\n");
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if ($spacelen == $chunksize)
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continue; // complete chunk contained whitespace
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$input = $this->getInput($chunksize);
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if ($input == '' || $input[0] != '/')
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break;
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}
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// Comments
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if (!preg_match('/^\/(?:\*(@(?:cc_on|if|elif|else|end))?.*?\*\/|\/[^\n]*)/s', $input, $match))
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{
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if (!$chunksize)
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break;
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// retry with a full chunk fetch; this also prevents breakage of long regular expressions (which will never match a comment)
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$chunksize = null;
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continue;
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}
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// check if this is a conditional (JScript) comment
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if (!empty($match[1]))
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{
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$match[0] = '/*' . $match[1];
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$conditional_comment = true;
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break;
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}
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else
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{
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$this->cursor += strlen($match[0]);
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$this->lineno += substr_count($match[0], "\n");
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}
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}
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if ($input == '')
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{
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$tt = TOKEN_END;
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$match = array('');
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}
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elseif ($conditional_comment)
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{
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$tt = TOKEN_CONDCOMMENT_START;
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}
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else
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{
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switch ($input[0])
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{
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case '0':
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// hexadecimal
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if (($input[1] == 'x' || $input[1] == 'X') && preg_match('/^0x[0-9a-f]+/i', $input, $match))
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{
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$tt = TOKEN_NUMBER;
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break;
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}
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// FALL THROUGH
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case '1': case '2': case '3': case '4': case '5':
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case '6': case '7': case '8': case '9':
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// should always match
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preg_match('/^\d+(?:\.\d*)?(?:[eE][-+]?\d+)?/', $input, $match);
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$tt = TOKEN_NUMBER;
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break;
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case "'":
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if (preg_match('/^\'(?:[^\\\\\'\r\n]++|\\\\(?:.|\r?\n))*\'/', $input, $match))
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{
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$tt = TOKEN_STRING;
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}
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else
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{
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if ($chunksize)
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return $this->get(null); // retry with a full chunk fetch
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throw $this->newSyntaxError('Unterminated string literal');
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}
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break;
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case '"':
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if (preg_match('/^"(?:[^\\\\"\r\n]++|\\\\(?:.|\r?\n))*"/', $input, $match))
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{
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$tt = TOKEN_STRING;
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}
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else
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{
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if ($chunksize)
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return $this->get(null); // retry with a full chunk fetch
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throw $this->newSyntaxError('Unterminated string literal');
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}
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break;
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case '/':
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if ($this->scanOperand && preg_match('/^\/((?:\\\\.|\[(?:\\\\.|[^\]])*\]|[^\/])+)\/([gimy]*)/', $input, $match))
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{
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$tt = TOKEN_REGEXP;
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break;
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}
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// FALL THROUGH
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case '|':
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case '^':
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case '&':
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case '<':
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case '>':
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case '+':
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case '-':
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case '*':
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case '%':
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case '=':
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case '!':
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// should always match
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preg_match($this->opRegExp, $input, $match);
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$op = $match[0];
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if (in_array($op, $this->assignOps) && $input[strlen($op)] == '=')
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{
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$tt = OP_ASSIGN;
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$match[0] .= '=';
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}
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else
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{
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$tt = $op;
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if ($this->scanOperand)
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{
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if ($op == OP_PLUS)
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$tt = OP_UNARY_PLUS;
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elseif ($op == OP_MINUS)
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$tt = OP_UNARY_MINUS;
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}
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$op = null;
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}
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break;
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case '.':
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if (preg_match('/^\.\d+(?:[eE][-+]?\d+)?/', $input, $match))
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{
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$tt = TOKEN_NUMBER;
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break;
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}
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// FALL THROUGH
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case ';':
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case ',':
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case '?':
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case ':':
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case '~':
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case '[':
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case ']':
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case '{':
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case '}':
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case '(':
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case ')':
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// these are all single
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$match = array($input[0]);
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$tt = $input[0];
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break;
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case '@':
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// check end of conditional comment
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if (substr($input, 0, 3) == '@*/')
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||
|
|
{
|
||
|
|
$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);
|
||
|
|
}
|
||
|
|
}
|