738 lines
23 KiB
PHP
738 lines
23 KiB
PHP
<?php
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/* 9 April 2008. version 1.1
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*
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* This is the php version of the Dean Edwards JavaScript's Packer,
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* Based on :
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*
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* ParseMaster, version 1.0.2 (2005-08-19) Copyright 2005, Dean Edwards
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* a multi-pattern parser.
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* KNOWN BUG: erroneous behavior when using escapeChar with a replacement
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* value that is a function
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*
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* packer, version 2.0.2 (2005-08-19) Copyright 2004-2005, Dean Edwards
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*
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* License: http://creativecommons.org/licenses/LGPL/2.1/
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*
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* Ported to PHP by Nicolas Martin.
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* modified by Mark Fabrizio Jr. to work with php 4
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*
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* ----------------------------------------------------------------------
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* changelog:
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* 1.1 : correct a bug, '\0' packed then unpacked becomes '\'.
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* ----------------------------------------------------------------------
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*
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* examples of usage :
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* $myPacker = new JavaScriptPacker($script, 62, true, false);
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* $packed = $myPacker->pack();
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*
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* or
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*
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* $myPacker = new JavaScriptPacker($script, 'Normal', true, false);
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* $packed = $myPacker->pack();
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*
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* or (default values)
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*
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* $myPacker = new JavaScriptPacker($script);
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* $packed = $myPacker->pack();
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*
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*
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* params of the constructor :
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* $script: the JavaScript to pack, string.
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* $encoding: level of encoding, int or string :
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* 0,10,62,95 or 'None', 'Numeric', 'Normal', 'High ASCII'.
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* default: 62.
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* $fastDecode: include the fast decoder in the packed result, boolean.
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* default : true.
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* $specialChars: if you are flagged your private and local variables
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* in the script, boolean.
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* default: false.
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*
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* The pack() method return the compressed JavasScript, as a string.
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*
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* see http://dean.edwards.name/packer/usage/ for more information.
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*
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* Notes :
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* # [del]need PHP 5 . Tested with PHP 5.1.2[/del]
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* this is a modified version for PHP 4
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*
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* # The packed result may be different than with the Dean Edwards
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* version, but with the same length. The reason is that the PHP
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* function usort to sort array don't necessarily preserve the
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* original order of two equal member. The Javascript sort function
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* in fact preserve this order (but that's not require by the
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* ECMAScript standard). So the encoded keywords order can be
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* different in the two results.
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*
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* # Be careful with the 'High ASCII' Level encoding if you use
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* UTF-8 in your files...
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*/
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/*
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* modified by Mark Fabrizio Jr. to work with php 4
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*/
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class JavaScriptPacker {
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var $IGNORE = '$1';
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// validate parameters
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var $_script = '';
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var $_encoding = 62;
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var $_fastDecode = true;
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var $_specialChars = false;
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var $LITERAL_ENCODING = array(
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'None' => 0,
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'Numeric' => 10,
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'Normal' => 62,
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'High ASCII' => 95
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);
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function JavaScriptPacker($_script, $_encoding = 62, $_fastDecode = true, $_specialChars = false)
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{
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$this->_script = $_script . "\n";
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if (array_key_exists($_encoding, $this->LITERAL_ENCODING))
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$_encoding = $this->LITERAL_ENCODING[$_encoding];
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$this->_encoding = min((int)$_encoding, 95);
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$this->_fastDecode = $_fastDecode;
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$this->_specialChars = $_specialChars;
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}
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function pack() {
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$this->_addParser('_basicCompression');
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if ($this->_specialChars)
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$this->_addParser('_encodeSpecialChars');
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if ($this->_encoding)
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$this->_addParser('_encodeKeywords');
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// go!
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return $this->_pack($this->_script);
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}
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// apply all parsing routines
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function _pack($script) {
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for ($i = 0; isset($this->_parsers[$i]); $i++) {
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$script = call_user_func(array(&$this,$this->_parsers[$i]), $script);
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}
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return $script;
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}
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// keep a list of parsing functions, they'll be executed all at once
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var $_parsers = array();
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function _addParser($parser) {
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$this->_parsers[] = $parser;
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}
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// zero encoding - just removal of white space and comments
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function _basicCompression($script) {
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$parser = new ParseMaster();
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// make safe
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$parser->escapeChar = '\\';
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// protect strings
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$parser->add('/\'[^\'\\n\\r]*\'/',$this->IGNORE);
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$parser->add('/"[^"\\n\\r]*"/', $this->IGNORE);
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// remove comments
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$parser->add('/\\/\\/[^\\n\\r]*[\\n\\r]/', ' ');
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$parser->add('/\\/\\*[^*]*\\*+([^\\/][^*]*\\*+)*\\//', ' ');
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// protect regular expressions
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$parser->add('/\\s+(\\/[^\\/\\n\\r\\*][^\\/\\n\\r]*\\/g?i?)/', '$2'); // IGNORE
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$parser->add('/[^\\w\\x24\\/\'"*)\\?:]\\/[^\\/\\n\\r\\*][^\\/\\n\\r]*\\/g?i?/', $this->IGNORE);
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// remove: ;;; doSomething();
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if ($this->_specialChars) $parser->add('/;;;[^\\n\\r]+[\\n\\r]/');
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// remove redundant semi-colons
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$parser->add('/\\(;;\\)/', $this->IGNORE); // protect for (;;) loops
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$parser->add('/;+\\s*([};])/', '$2');
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// apply the above
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$script = $parser->exec($script);
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// remove white-space
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$parser->add('/(\\b|\\x24)\\s+(\\b|\\x24)/', '$2 $3');
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$parser->add('/([+\\-])\\s+([+\\-])/', '$2 $3');
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$parser->add('/\\s+/', '');
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// done
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return $parser->exec($script);
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}
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function _encodeSpecialChars($script) {
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$parser = new ParseMaster();
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// replace: $name -> n, $$name -> na
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$parser->add('/((\\x24+)([a-zA-Z$_]+))(\\d*)/',
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array('fn' => '_replace_name')
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);
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// replace: _name -> _0, double-underscore (__name) is ignored
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$regexp = '/\\b_[A-Za-z\\d]\\w*/';
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// build the word list
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$keywords = $this->_analyze($script, $regexp, '_encodePrivate');
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// quick ref
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$encoded = $keywords['encoded'];
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$parser->add($regexp,
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array(
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'fn' => '_replace_encoded',
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'data' => $encoded
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)
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);
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return $parser->exec($script);
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}
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function _encodeKeywords($script) {
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// escape high-ascii values already in the script (i.e. in strings)
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if ($this->_encoding > 62)
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$script = $this->_escape95($script);
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// create the parser
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$parser = new ParseMaster();
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$encode = $this->_getEncoder($this->_encoding);
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// for high-ascii, don't encode single character low-ascii
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$regexp = ($this->_encoding > 62) ? '/\\w\\w+/' : '/\\w+/';
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// build the word list
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$keywords = $this->_analyze($script, $regexp, $encode);
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$encoded = $keywords['encoded'];
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// encode
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$parser->add($regexp,
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array(
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'fn' => '_replace_encoded',
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'data' => $encoded
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)
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);
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if (empty($script)) return $script;
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else {
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//$res = $parser->exec($script);
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//$res = $this->_bootStrap($res, $keywords);
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//return $res;
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return $this->_bootStrap($parser->exec($script), $keywords);
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}
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}
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function _analyze($script, $regexp, $encode) {
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// analyse
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// retreive all words in the script
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$all = array();
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preg_match_all($regexp, $script, $all);
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$_sorted = array(); // list of words sorted by frequency
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$_encoded = array(); // dictionary of word->encoding
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$_protected = array(); // instances of "protected" words
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$all = $all[0]; // simulate the javascript comportement of global match
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if (!empty($all)) {
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$unsorted = array(); // same list, not sorted
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$protected = array(); // "protected" words (dictionary of word->"word")
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$value = array(); // dictionary of charCode->encoding (eg. 256->ff)
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$this->_count = array(); // word->count
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$i = count($all); $j = 0; //$word = null;
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// count the occurrences - used for sorting later
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do {
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--$i;
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$word = '$' . $all[$i];
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if (!isset($this->_count[$word])) {
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$this->_count[$word] = 0;
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$unsorted[$j] = $word;
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// make a dictionary of all of the protected words in this script
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// these are words that might be mistaken for encoding
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//if (is_string($encode) && method_exists($this, $encode))
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$values[$j] = call_user_func(array(&$this, $encode), $j);
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$protected['$' . $values[$j]] = $j++;
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}
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// increment the word counter
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$this->_count[$word]++;
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} while ($i > 0);
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// prepare to sort the word list, first we must protect
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// words that are also used as codes. we assign them a code
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// equivalent to the word itself.
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// e.g. if "do" falls within our encoding range
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// then we store keywords["do"] = "do";
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// this avoids problems when decoding
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$i = count($unsorted);
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do {
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$word = $unsorted[--$i];
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if (isset($protected[$word]) /*!= null*/) {
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$_sorted[$protected[$word]] = substr($word, 1);
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$_protected[$protected[$word]] = true;
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$this->_count[$word] = 0;
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}
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} while ($i);
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// sort the words by frequency
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// Note: the javascript and php version of sort can be different :
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// in php manual, usort :
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// " If two members compare as equal,
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// their order in the sorted array is undefined."
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// so the final packed script is different of the Dean's javascript version
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// but equivalent.
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// the ECMAscript standard does not guarantee this behaviour,
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// and thus not all browsers (e.g. Mozilla versions dating back to at
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// least 2003) respect this.
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usort($unsorted, array(&$this, '_sortWords'));
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$j = 0;
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// because there are "protected" words in the list
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// we must add the sorted words around them
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do {
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if (!isset($_sorted[$i]))
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$_sorted[$i] = substr($unsorted[$j++], 1);
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$_encoded[$_sorted[$i]] = $values[$i];
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} while (++$i < count($unsorted));
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}
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return array(
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'sorted' => $_sorted,
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'encoded' => $_encoded,
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'protected' => $_protected);
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}
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var $_count = array();
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function _sortWords($match1, $match2) {
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return $this->_count[$match2] - $this->_count[$match1];
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}
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// build the boot function used for loading and decoding
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function _bootStrap($packed, $keywords) {
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$ENCODE = $this->_safeRegExp('$encode\\($count\\)');
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// $packed: the packed script
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$packed = "'" . $this->_escape($packed) . "'";
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// $ascii: base for encoding
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$ascii = min(count($keywords['sorted']), $this->_encoding);
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if ($ascii == 0) $ascii = 1;
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// $count: number of words contained in the script
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$count = count($keywords['sorted']);
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// $keywords: list of words contained in the script
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foreach ($keywords['protected'] as $i=>$value) {
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$keywords['sorted'][$i] = '';
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}
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// convert from a string to an array
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ksort($keywords['sorted']);
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$keywords = "'" . implode('|',$keywords['sorted']) . "'.split('|')";
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$encode = ($this->_encoding > 62) ? '_encode95' : $this->_getEncoder($ascii);
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$encode = $this->_getJSFunction($encode);
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$encode = preg_replace('/_encoding/','$ascii', $encode);
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$encode = preg_replace('/arguments\\.callee/','$encode', $encode);
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$inline = '\\$count' . ($ascii > 10 ? '.toString(\\$ascii)' : '');
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// $decode: code snippet to speed up decoding
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if ($this->_fastDecode) {
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// create the decoder
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$decode = $this->_getJSFunction('_decodeBody');
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if ($this->_encoding > 62)
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$decode = preg_replace('/\\\\w/', '[\\xa1-\\xff]', $decode);
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// perform the encoding inline for lower ascii values
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elseif ($ascii < 36)
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$decode = preg_replace($ENCODE, $inline, $decode);
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// special case: when $count==0 there are no keywords. I want to keep
|
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// the basic shape of the unpacking funcion so i'll frig the code...
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if ($count == 0)
|
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$decode = preg_replace($this->_safeRegExp('($count)\\s*=\\s*1'), '$1=0', $decode, 1);
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}
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// boot function
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$unpack = $this->_getJSFunction('_unpack');
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if ($this->_fastDecode) {
|
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// insert the decoder
|
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$this->buffer = $decode;
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$unpack = preg_replace_callback('/\\{/', array(&$this, '_insertFastDecode'), $unpack, 1);
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}
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$unpack = preg_replace('/"/', "'", $unpack);
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if ($this->_encoding > 62) { // high-ascii
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// get rid of the word-boundaries for regexp matches
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$unpack = preg_replace('/\'\\\\\\\\b\'\s*\\+|\\+\s*\'\\\\\\\\b\'/', '', $unpack);
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}
|
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if ($ascii > 36 || $this->_encoding > 62 || $this->_fastDecode) {
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// insert the encode function
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$this->buffer = $encode;
|
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$unpack = preg_replace_callback('/\\{/', array(&$this, '_insertFastEncode'), $unpack, 1);
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} else {
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// perform the encoding inline
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$unpack = preg_replace($ENCODE, $inline, $unpack);
|
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}
|
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// pack the boot function too
|
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$unpackPacker = new JavaScriptPacker($unpack, 0, false, true);
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$unpack = $unpackPacker->pack();
|
||
|
||
// arguments
|
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$params = array($packed, $ascii, $count, $keywords);
|
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if ($this->_fastDecode) {
|
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$params[] = 0;
|
||
$params[] = '{}';
|
||
}
|
||
$params = implode(',', $params);
|
||
|
||
// the whole thing
|
||
return 'eval(' . $unpack . '(' . $params . "))\n";
|
||
}
|
||
|
||
var $buffer;
|
||
function _insertFastDecode($match) {
|
||
return '{' . $this->buffer . ';';
|
||
}
|
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function _insertFastEncode($match) {
|
||
return '{$encode=' . $this->buffer . ';';
|
||
}
|
||
|
||
// mmm.. ..which one do i need ??
|
||
function _getEncoder($ascii) {
|
||
return $ascii > 10 ? $ascii > 36 ? $ascii > 62 ?
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'_encode95' : '_encode62' : '_encode36' : '_encode10';
|
||
}
|
||
|
||
// zero encoding
|
||
// characters: 0123456789
|
||
function _encode10($charCode) {
|
||
return $charCode;
|
||
}
|
||
|
||
// inherent base36 support
|
||
// characters: 0123456789abcdefghijklmnopqrstuvwxyz
|
||
function _encode36($charCode) {
|
||
return base_convert($charCode, 10, 36);
|
||
}
|
||
|
||
// hitch a ride on base36 and add the upper case alpha characters
|
||
// characters: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||
function _encode62($charCode) {
|
||
$res = '';
|
||
if ($charCode >= $this->_encoding) {
|
||
$res = $this->_encode62((int)($charCode / $this->_encoding));
|
||
}
|
||
$charCode = $charCode % $this->_encoding;
|
||
|
||
if ($charCode > 35)
|
||
return $res . chr($charCode + 29);
|
||
else
|
||
return $res . base_convert($charCode, 10, 36);
|
||
}
|
||
|
||
// use high-ascii values
|
||
// characters: ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿À<C2BF>?ÂÃÄÅÆÇÈÉÊËÌ<C38B>?Î<>?<3F>?ÑÒÓÔÕÖ×ØÙÚÛÜ<C39B>?Þßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþ
|
||
function _encode95($charCode) {
|
||
$res = '';
|
||
if ($charCode >= $this->_encoding)
|
||
$res = $this->_encode95($charCode / $this->_encoding);
|
||
|
||
return $res . chr(($charCode % $this->_encoding) + 161);
|
||
}
|
||
|
||
function _safeRegExp($string) {
|
||
return '/'.preg_replace('/\$/', '\\\$', $string).'/';
|
||
}
|
||
|
||
function _encodePrivate($charCode) {
|
||
return "_" . $charCode;
|
||
}
|
||
|
||
// protect characters used by the parser
|
||
function _escape($script) {
|
||
return preg_replace('/([\\\\\'])/', '\\\$1', $script);
|
||
}
|
||
|
||
// protect high-ascii characters already in the script
|
||
function _escape95($script) {
|
||
return preg_replace_callback(
|
||
'/[\\xa1-\\xff]/',
|
||
array(&$this, '_escape95Bis'),
|
||
$script
|
||
);
|
||
}
|
||
function _escape95Bis($match) {
|
||
return '\x'.((string)dechex(ord($match)));
|
||
}
|
||
|
||
|
||
function _getJSFunction($aName) {
|
||
$func = 'JSFUNCTION'.$aName;
|
||
if (isset($this->$func)){
|
||
return $this->$func;
|
||
}
|
||
else
|
||
return '';
|
||
}
|
||
|
||
// JavaScript Functions used.
|
||
// Note : In Dean's version, these functions are converted
|
||
// with 'String(aFunctionName);'.
|
||
// This internal conversion complete the original code, ex :
|
||
// 'while (aBool) anAction();' is converted to
|
||
// 'while (aBool) { anAction(); }'.
|
||
// The JavaScript functions below are corrected.
|
||
|
||
// unpacking function - this is the boot strap function
|
||
// data extracted from this packing routine is passed to
|
||
// this function when decoded in the target
|
||
// NOTE ! : without the ';' final.
|
||
var $JSFUNCTION_unpack = 'function($packed, $ascii, $count, $keywords, $encode, $decode) {
|
||
while ($count--) {
|
||
if ($keywords[$count]) {
|
||
$packed = $packed.replace(new RegExp(\'\\\\b\' + $encode($count) + \'\\\\b\', \'g\'), $keywords[$count]);
|
||
}
|
||
}
|
||
return $packed;
|
||
}';
|
||
/*
|
||
'function($packed, $ascii, $count, $keywords, $encode, $decode) {
|
||
while ($count--)
|
||
if ($keywords[$count])
|
||
$packed = $packed.replace(new RegExp(\'\\\\b\' + $encode($count) + \'\\\\b\', \'g\'), $keywords[$count]);
|
||
return $packed;
|
||
}';
|
||
*/
|
||
|
||
// code-snippet inserted into the unpacker to speed up decoding
|
||
var $JSFUNCTION_decodeBody = ' if (!\'\'.replace(/^/, String)) {
|
||
// decode all the values we need
|
||
while ($count--) {
|
||
$decode[$encode($count)] = $keywords[$count] || $encode($count);
|
||
}
|
||
// global replacement function
|
||
$keywords = [function ($encoded) {return $decode[$encoded]}];
|
||
// generic match
|
||
$encode = function () {return \'\\\\w+\'};
|
||
// reset the loop counter - we are now doing a global replace
|
||
$count = 1;
|
||
}
|
||
';
|
||
//};
|
||
/*
|
||
' if (!\'\'.replace(/^/, String)) {
|
||
// decode all the values we need
|
||
while ($count--) $decode[$encode($count)] = $keywords[$count] || $encode($count);
|
||
// global replacement function
|
||
$keywords = [function ($encoded) {return $decode[$encoded]}];
|
||
// generic match
|
||
$encode = function () {return\'\\\\w+\'};
|
||
// reset the loop counter - we are now doing a global replace
|
||
$count = 1;
|
||
}';
|
||
*/
|
||
|
||
// zero encoding
|
||
// characters: 0123456789
|
||
var $JSFUNCTION_encode10 = 'function($charCode) {
|
||
return $charCode;
|
||
}';//;';
|
||
|
||
// inherent base36 support
|
||
// characters: 0123456789abcdefghijklmnopqrstuvwxyz
|
||
var $JSFUNCTION_encode36 = 'function($charCode) {
|
||
return $charCode.toString(36);
|
||
}';//;';
|
||
|
||
// hitch a ride on base36 and add the upper case alpha characters
|
||
// characters: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
|
||
var $JSFUNCTION_encode62 = 'function($charCode) {
|
||
return ($charCode < _encoding ? \'\' : arguments.callee(parseInt($charCode / _encoding))) +
|
||
(($charCode = $charCode % _encoding) > 35 ? String.fromCharCode($charCode + 29) : $charCode.toString(36));
|
||
}';
|
||
|
||
// use high-ascii values
|
||
// characters: ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿À<C2BF>?ÂÃÄÅÆÇÈÉÊËÌ<C38B>?Î<>?<3F>?ÑÒÓÔÕÖ×ØÙÚÛÜ<C39B>?Þßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþ
|
||
var $JSFUNCTION_encode95 = 'function($charCode) {
|
||
return ($charCode < _encoding ? \'\' : arguments.callee($charCode / _encoding)) +
|
||
String.fromCharCode($charCode % _encoding + 161);
|
||
}';
|
||
|
||
}
|
||
|
||
|
||
class ParseMaster {
|
||
var $ignoreCase = false;
|
||
var $escapeChar = '';
|
||
|
||
// constants
|
||
var $EXPRESSION = 0;
|
||
var $REPLACEMENT = 1;
|
||
var $LENGTH = 2;
|
||
|
||
// used to determine nesting levels
|
||
var $GROUPS = '/\\(/';//g
|
||
var $SUB_REPLACE = '/\\$\\d/';
|
||
var $INDEXED = '/^\\$\\d+$/';
|
||
var $TRIM = '/([\'"])\\1\\.(.*)\\.\\1\\1$/';
|
||
var $ESCAPE = '/\\\./';//g
|
||
var $QUOTE = '/\'/';
|
||
var $DELETED = '/\\x01[^\\x01]*\\x01/';//g
|
||
|
||
function add($expression, $replacement = '') {
|
||
// count the number of sub-expressions
|
||
// - add one because each pattern is itself a sub-expression
|
||
$length = 1 + preg_match_all($this->GROUPS, $this->_internalEscape((string)$expression), $out);
|
||
|
||
// treat only strings $replacement
|
||
if (is_string($replacement)) {
|
||
// does the pattern deal with sub-expressions?
|
||
if (preg_match($this->SUB_REPLACE, $replacement)) {
|
||
// a simple lookup? (e.g. "$2")
|
||
if (preg_match($this->INDEXED, $replacement)) {
|
||
// store the index (used for fast retrieval of matched strings)
|
||
$replacement = (int)(substr($replacement, 1)) - 1;
|
||
} else { // a complicated lookup (e.g. "Hello $2 $1")
|
||
// build a function to do the lookup
|
||
$quote = preg_match($this->QUOTE, $this->_internalEscape($replacement))
|
||
? '"' : "'";
|
||
$replacement = array(
|
||
'fn' => '_backReferences',
|
||
'data' => array(
|
||
'replacement' => $replacement,
|
||
'length' => $length,
|
||
'quote' => $quote
|
||
)
|
||
);
|
||
}
|
||
}
|
||
}
|
||
// pass the modified arguments
|
||
if (!empty($expression)) $this->_add($expression, $replacement, $length);
|
||
else $this->_add('/^$/', $replacement, $length);
|
||
}
|
||
|
||
function exec($string) {
|
||
// execute the global replacement
|
||
$this->_escaped = array();
|
||
|
||
// simulate the _patterns.toSTring of Dean
|
||
$regexp = '/';
|
||
foreach ($this->_patterns as $reg) {
|
||
$regexp .= '(' . substr($reg[$this->EXPRESSION], 1, -1) . ')|';
|
||
}
|
||
$regexp = substr($regexp, 0, -1) . '/';
|
||
$regexp .= ($this->ignoreCase) ? 'i' : '';
|
||
|
||
$string = $this->_escape($string, $this->escapeChar);
|
||
$string = preg_replace_callback(
|
||
$regexp,
|
||
array(
|
||
&$this,
|
||
'_replacement'
|
||
),
|
||
$string
|
||
);
|
||
$string = $this->_unescape($string, $this->escapeChar);
|
||
|
||
return preg_replace($this->DELETED, '', $string);
|
||
}
|
||
|
||
function reset() {
|
||
// clear the patterns collection so that this object may be re-used
|
||
$this->_patterns = array();
|
||
}
|
||
|
||
// private
|
||
var $_escaped = array(); // escaped characters
|
||
var $_patterns = array(); // patterns stored by index
|
||
|
||
// create and add a new pattern to the patterns collection
|
||
function _add() {
|
||
$arguments = func_get_args();
|
||
$this->_patterns[] = $arguments;
|
||
}
|
||
|
||
// this is the global replace function (it's quite complicated)
|
||
function _replacement($arguments) {
|
||
if (empty($arguments)) return '';
|
||
|
||
$i = 1; $j = 0;
|
||
// loop through the patterns
|
||
while (isset($this->_patterns[$j])) {
|
||
$pattern = $this->_patterns[$j++];
|
||
// do we have a result?
|
||
if (isset($arguments[$i]) && ($arguments[$i] != '')) {
|
||
$replacement = $pattern[$this->REPLACEMENT];
|
||
|
||
if (is_array($replacement) && isset($replacement['fn'])) {
|
||
|
||
if (isset($replacement['data'])) $this->buffer = $replacement['data'];
|
||
return call_user_func(array(&$this, $replacement['fn']), $arguments, $i);
|
||
|
||
} elseif (is_int($replacement)) {
|
||
return $arguments[$replacement + $i];
|
||
|
||
}
|
||
$delete = ($this->escapeChar == '' ||
|
||
strpos($arguments[$i], $this->escapeChar) === false)
|
||
? '' : "\x01" . $arguments[$i] . "\x01";
|
||
return $delete . $replacement;
|
||
|
||
// skip over references to sub-expressions
|
||
} else {
|
||
$i += $pattern[$this->LENGTH];
|
||
}
|
||
}
|
||
}
|
||
|
||
function _backReferences($match, $offset) {
|
||
$replacement = $this->buffer['replacement'];
|
||
$quote = $this->buffer['quote'];
|
||
$i = $this->buffer['length'];
|
||
while ($i) {
|
||
$replacement = str_replace('$'.$i--, $match[$offset + $i], $replacement);
|
||
}
|
||
return $replacement;
|
||
}
|
||
|
||
function _replace_name($match, $offset){
|
||
$length = strlen($match[$offset + 2]);
|
||
$start = $length - max($length - strlen($match[$offset + 3]), 0);
|
||
return substr($match[$offset + 1], $start, $length) . $match[$offset + 4];
|
||
}
|
||
|
||
function _replace_encoded($match, $offset) {
|
||
return $this->buffer[$match[$offset]];
|
||
}
|
||
|
||
|
||
// php : we cannot pass additional data to preg_replace_callback,
|
||
// and we cannot use &$this in create_function, so let's go to lower level
|
||
var $buffer;
|
||
|
||
// encode escaped characters
|
||
function _escape($string, $escapeChar) {
|
||
if ($escapeChar) {
|
||
$this->buffer = $escapeChar;
|
||
return preg_replace_callback(
|
||
'/\\' . $escapeChar . '(.)' .'/',
|
||
array(&$this, '_escapeBis'),
|
||
$string
|
||
);
|
||
|
||
} else {
|
||
return $string;
|
||
}
|
||
}
|
||
function _escapeBis($match) {
|
||
$this->_escaped[] = $match[1];
|
||
return $this->buffer;
|
||
}
|
||
|
||
// decode escaped characters
|
||
function _unescape($string, $escapeChar) {
|
||
if ($escapeChar) {
|
||
$regexp = '/'.'\\'.$escapeChar.'/';
|
||
$this->buffer = array('escapeChar'=> $escapeChar, 'i' => 0);
|
||
return preg_replace_callback
|
||
(
|
||
$regexp,
|
||
array(&$this, '_unescapeBis'),
|
||
$string
|
||
);
|
||
|
||
} else {
|
||
return $string;
|
||
}
|
||
}
|
||
function _unescapeBis() {
|
||
if (isset($this->_escaped[$this->buffer['i']])
|
||
&& $this->_escaped[$this->buffer['i']] != '')
|
||
{
|
||
$temp = $this->_escaped[$this->buffer['i']];
|
||
} else {
|
||
$temp = '';
|
||
}
|
||
$this->buffer['i']++;
|
||
return $this->buffer['escapeChar'] . $temp;
|
||
}
|
||
|
||
function _internalEscape($string) {
|
||
return preg_replace($this->ESCAPE, '', $string);
|
||
}
|
||
}
|
||
?>
|