0,0 → 1,788 |
<?php |
/* 25 October 2011. version 1.1-FF4 |
* |
* This is the php version of the Dean Edwards JavaScript's Packer, |
* Based on : |
* |
* ParseMaster, version 1.0.2 (2005-08-19) Copyright 2005, Dean Edwards |
* a multi-pattern parser. |
* KNOWN BUG: erroneous behavior when using escapeChar with a replacement |
* value that is a function |
* |
* packer, version 2.0.2 (2005-08-19) Copyright 2004-2005, Dean Edwards |
* |
* License: http://creativecommons.org/licenses/LGPL/2.1/ |
* |
* Ported to PHP by Nicolas Martin. |
* |
* ---------------------------------------------------------------------- |
* changelog: |
* 1.1 : correct a bug, '\0' packed then unpacked becomes '\'. |
* 1.1-FF4 : Firefox 4 fix, Copyright 2011, Mieczyslaw Nalewaj |
* ---------------------------------------------------------------------- |
* |
* examples of usage : |
* $myPacker = new JavaScriptPacker($script, 62, true, false); |
* $packed = $myPacker->pack(); |
* |
* or |
* |
* $myPacker = new JavaScriptPacker($script, 'Normal', true, false); |
* $packed = $myPacker->pack(); |
* |
* or (default values) |
* |
* $myPacker = new JavaScriptPacker($script); |
* $packed = $myPacker->pack(); |
* |
* |
* params of the constructor : |
* $script: the JavaScript to pack, string. |
* $encoding: level of encoding, int or string : |
* 0,10,62,95 or 'None', 'Numeric', 'Normal', 'High ASCII'. |
* default: 62. |
* $fastDecode: include the fast decoder in the packed result, boolean. |
* default : true. |
* $specialChars: if you are flagged your private and local variables |
* in the script, boolean. |
* default: false. |
* |
* The pack() method return the compressed JavasScript, as a string. |
* |
* see http://dean.edwards.name/packer/usage/ for more information. |
* |
* Notes : |
* # need PHP 5 . Tested with PHP 5.1.2, 5.1.3, 5.1.4, 5.2.3 |
* |
* # The packed result may be different than with the Dean Edwards |
* version, but with the same length. The reason is that the PHP |
* function usort to sort array don't necessarily preserve the |
* original order of two equal member. The Javascript sort function |
* in fact preserve this order (but that's not require by the |
* ECMAScript standard). So the encoded keywords order can be |
* different in the two results. |
* |
* # Be careful with the 'High ASCII' Level encoding if you use |
* UTF-8 in your files... |
*/ |
|
|
class JavaScriptPacker |
{ |
// constants |
const IGNORE = '$1'; |
|
// validate parameters |
private $_script = ''; |
private $_encoding = 62; |
private $_fastDecode = true; |
private $_specialChars = false; |
|
private $LITERAL_ENCODING = array( |
'None' => 0, |
'Numeric' => 10, |
'Normal' => 62, |
'High ASCII' => 95 |
); |
|
public function __construct($_script, $_encoding = 62, $_fastDecode = true, $_specialChars = false) |
{ |
$this->_script = $_script . "\n"; |
if (array_key_exists($_encoding, $this->LITERAL_ENCODING)) |
$_encoding = $this->LITERAL_ENCODING[$_encoding]; |
$this->_encoding = min((int) $_encoding, 95); |
$this->_fastDecode = $_fastDecode; |
$this->_specialChars = $_specialChars; |
} |
|
public function pack() |
{ |
$this->_addParser('_basicCompression'); |
if ($this->_specialChars) |
$this->_addParser('_encodeSpecialChars'); |
if ($this->_encoding) |
$this->_addParser('_encodeKeywords'); |
|
// go! |
return $this->_pack($this->_script); |
} |
|
// apply all parsing routines |
private function _pack($script) |
{ |
for ($i = 0; isset($this->_parsers[$i]); $i++) { |
$script = call_user_func(array(&$this, $this->_parsers[$i]), $script); |
} |
|
return $script; |
} |
|
// keep a list of parsing functions, they'll be executed all at once |
private $_parsers = array(); |
private function _addParser($parser) |
{ |
$this->_parsers[] = $parser; |
} |
|
// zero encoding - just removal of white space and comments |
private function _basicCompression($script) |
{ |
$parser = new ParseMaster(); |
// make safe |
$parser->escapeChar = '\\'; |
// protect strings |
$parser->add('/\'[^\'\\n\\r]*\'/', self::IGNORE); |
$parser->add('/"[^"\\n\\r]*"/', self::IGNORE); |
// remove comments |
$parser->add('/\\/\\/[^\\n\\r]*[\\n\\r]/', ' '); |
$parser->add('/\\/\\*[^*]*\\*+([^\\/][^*]*\\*+)*\\//', ' '); |
// protect regular expressions |
$parser->add('/\\s+(\\/[^\\/\\n\\r\\*][^\\/\\n\\r]*\\/g?i?)/', '$2'); // IGNORE |
$parser->add('/[^\\w\\x24\\/\'"*)\\?:]\\/[^\\/\\n\\r\\*][^\\/\\n\\r]*\\/g?i?/', self::IGNORE); |
// remove: ;;; doSomething(); |
if ($this->_specialChars) $parser->add('/;;;[^\\n\\r]+[\\n\\r]/'); |
// remove redundant semi-colons |
$parser->add('/\\(;;\\)/', self::IGNORE); // protect for (;;) loops |
$parser->add('/;+\\s*([};])/', '$2'); |
// apply the above |
$script = $parser->exec($script); |
|
// remove white-space |
$parser->add('/(\\b|\\x24)\\s+(\\b|\\x24)/', '$2 $3'); |
$parser->add('/([+\\-])\\s+([+\\-])/', '$2 $3'); |
$parser->add('/\\s+/', ''); |
// done |
return $parser->exec($script); |
} |
|
private function _encodeSpecialChars($script) |
{ |
$parser = new ParseMaster(); |
// replace: $name -> n, $$name -> na |
$parser->add('/((\\x24+)([a-zA-Z$_]+))(\\d*)/', |
array('fn' => '_replace_name') |
); |
// replace: _name -> _0, double-underscore (__name) is ignored |
$regexp = '/\\b_[A-Za-z\\d]\\w*/'; |
// build the word list |
$keywords = $this->_analyze($script, $regexp, '_encodePrivate'); |
// quick ref |
$encoded = $keywords['encoded']; |
|
$parser->add($regexp, |
array( |
'fn' => '_replace_encoded', |
'data' => $encoded |
) |
); |
|
return $parser->exec($script); |
} |
|
private function _encodeKeywords($script) |
{ |
// escape high-ascii values already in the script (i.e. in strings) |
if ($this->_encoding > 62) |
$script = $this->_escape95($script); |
// create the parser |
$parser = new ParseMaster(); |
$encode = $this->_getEncoder($this->_encoding); |
// for high-ascii, don't encode single character low-ascii |
$regexp = ($this->_encoding > 62) ? '/\\w\\w+/' : '/\\w+/'; |
// build the word list |
$keywords = $this->_analyze($script, $regexp, $encode); |
$encoded = $keywords['encoded']; |
|
// encode |
$parser->add($regexp, |
array( |
'fn' => '_replace_encoded', |
'data' => $encoded |
) |
); |
if (empty($script)) return $script; |
else { |
//$res = $parser->exec($script); |
//$res = $this->_bootStrap($res, $keywords); |
//return $res; |
return $this->_bootStrap($parser->exec($script), $keywords); |
} |
} |
|
private function _analyze($script, $regexp, $encode) |
{ |
// analyse |
// retreive all words in the script |
$all = array(); |
preg_match_all($regexp, $script, $all); |
$_sorted = array(); // list of words sorted by frequency |
$_encoded = array(); // dictionary of word->encoding |
$_protected = array(); // instances of "protected" words |
$all = $all[0]; // simulate the javascript comportement of global match |
if (!empty($all)) { |
$unsorted = array(); // same list, not sorted |
$protected = array(); // "protected" words (dictionary of word->"word") |
$value = array(); // dictionary of charCode->encoding (eg. 256->ff) |
$this->_count = array(); // word->count |
$i = count($all); $j = 0; //$word = null; |
// count the occurrences - used for sorting later |
do { |
--$i; |
$word = '$' . $all[$i]; |
if (!isset($this->_count[$word])) { |
$this->_count[$word] = 0; |
$unsorted[$j] = $word; |
// make a dictionary of all of the protected words in this script |
// these are words that might be mistaken for encoding |
//if (is_string($encode) && method_exists($this, $encode)) |
$values[$j] = call_user_func(array(&$this, $encode), $j); |
$protected['$' . $values[$j]] = $j++; |
} |
// increment the word counter |
$this->_count[$word]++; |
} while ($i > 0); |
// prepare to sort the word list, first we must protect |
// words that are also used as codes. we assign them a code |
// equivalent to the word itself. |
// e.g. if "do" falls within our encoding range |
// then we store keywords["do"] = "do"; |
// this avoids problems when decoding |
$i = count($unsorted); |
do { |
$word = $unsorted[--$i]; |
if (isset($protected[$word]) /*!= null*/) { |
$_sorted[$protected[$word]] = substr($word, 1); |
$_protected[$protected[$word]] = true; |
$this->_count[$word] = 0; |
} |
} while ($i); |
|
// sort the words by frequency |
// Note: the javascript and php version of sort can be different : |
// in php manual, usort : |
// " If two members compare as equal, |
// their order in the sorted array is undefined." |
// so the final packed script is different of the Dean's javascript version |
// but equivalent. |
// the ECMAscript standard does not guarantee this behaviour, |
// and thus not all browsers (e.g. Mozilla versions dating back to at |
// least 2003) respect this. |
usort($unsorted, array(&$this, '_sortWords')); |
$j = 0; |
// because there are "protected" words in the list |
// we must add the sorted words around them |
do { |
if (!isset($_sorted[$i])) |
$_sorted[$i] = substr($unsorted[$j++], 1); |
$_encoded[$_sorted[$i]] = $values[$i]; |
} while (++$i < count($unsorted)); |
} |
|
return array( |
'sorted' => $_sorted, |
'encoded' => $_encoded, |
'protected' => $_protected); |
} |
|
private $_count = array(); |
private function _sortWords($match1, $match2) |
{ |
return $this->_count[$match2] - $this->_count[$match1]; |
} |
|
// build the boot function used for loading and decoding |
private function _bootStrap($packed, $keywords) |
{ |
$ENCODE = $this->_safeRegExp('$encode\\($count\\)'); |
|
// $packed: the packed script |
$packed = "'" . $this->_escape($packed) . "'"; |
|
// $ascii: base for encoding |
$ascii = min(count($keywords['sorted']), $this->_encoding); |
if ($ascii == 0) $ascii = 1; |
|
// $count: number of words contained in the script |
$count = count($keywords['sorted']); |
|
// $keywords: list of words contained in the script |
foreach ($keywords['protected'] as $i=>$value) { |
$keywords['sorted'][$i] = ''; |
} |
// convert from a string to an array |
ksort($keywords['sorted']); |
$keywords = "'" . implode('|', $keywords['sorted']) . "'.split('|')"; |
|
$encode = ($this->_encoding > 62) ? '_encode95' : $this->_getEncoder($ascii); |
$encode = $this->_getJSFunction($encode); |
$encode = preg_replace('/_encoding/', '$ascii', $encode); |
$encode = preg_replace('/arguments\\.callee/', '$encode', $encode); |
$inline = '\\$count' . ($ascii > 10 ? '.toString(\\$ascii)' : ''); |
|
// $decode: code snippet to speed up decoding |
if ($this->_fastDecode) { |
// create the decoder |
$decode = $this->_getJSFunction('_decodeBody'); |
if ($this->_encoding > 62) |
$decode = preg_replace('/\\\\w/', '[\\xa1-\\xff]', $decode); |
// perform the encoding inline for lower ascii values |
elseif ($ascii < 36) |
$decode = preg_replace($ENCODE, $inline, $decode); |
// special case: when $count==0 there are no keywords. I want to keep |
// the basic shape of the unpacking funcion so i'll frig the code... |
if ($count == 0) |
$decode = preg_replace($this->_safeRegExp('($count)\\s*=\\s*1'), '$1=0', $decode, 1); |
} |
|
// boot function |
$unpack = $this->_getJSFunction('_unpack'); |
if ($this->_fastDecode) { |
// insert the decoder |
$this->buffer = $decode; |
$unpack = preg_replace_callback('/\\{/', array(&$this, '_insertFastDecode'), $unpack, 1); |
} |
$unpack = preg_replace('/"/', "'", $unpack); |
if ($this->_encoding > 62) { // high-ascii |
// get rid of the word-boundaries for regexp matches |
$unpack = preg_replace('/\'\\\\\\\\b\'\s*\\+|\\+\s*\'\\\\\\\\b\'/', '', $unpack); |
} |
if ($ascii > 36 || $this->_encoding > 62 || $this->_fastDecode) { |
// insert the encode function |
$this->buffer = $encode; |
$unpack = preg_replace_callback('/\\{/', array(&$this, '_insertFastEncode'), $unpack, 1); |
} else { |
// perform the encoding inline |
$unpack = preg_replace($ENCODE, $inline, $unpack); |
} |
// pack the boot function too |
$unpackPacker = new JavaScriptPacker($unpack, 0, false, true); |
$unpack = $unpackPacker->pack(); |
|
// arguments |
$params = array($packed, $ascii, $count, $keywords); |
if ($this->_fastDecode) { |
$params[] = 0; |
$params[] = '{}'; |
} |
$params = implode(',', $params); |
|
// the whole thing |
//Firefox 4 fix, old: return 'eval(' . $unpack . '(' . $params . "))\n"; |
return "(typeof setTimeout=='function'?setTimeout:eval)(" . $unpack . "(" . $params . "));\n"; |
} |
|
private $buffer; |
private function _insertFastDecode($match) |
{ |
return '{' . $this->buffer . ';'; |
} |
private function _insertFastEncode($match) |
{ |
return '{$encode=' . $this->buffer . ';'; |
} |
|
// mmm.. ..which one do i need ?? |
private function _getEncoder($ascii) |
{ |
return $ascii > 10 ? $ascii > 36 ? $ascii > 62 ? |
'_encode95' : '_encode62' : '_encode36' : '_encode10'; |
} |
|
// zero encoding |
// characters: 0123456789 |
private function _encode10($charCode) |
{ |
return $charCode; |
} |
|
// inherent base36 support |
// characters: 0123456789abcdefghijklmnopqrstuvwxyz |
private function _encode36($charCode) |
{ |
return base_convert($charCode, 10, 36); |
} |
|
// hitch a ride on base36 and add the upper case alpha characters |
// characters: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ |
private function _encode62($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¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþ |
private function _encode95($charCode) |
{ |
$res = ''; |
if ($charCode >= $this->_encoding) |
$res = $this->_encode95($charCode / $this->_encoding); |
|
return $res . chr(($charCode % $this->_encoding) + 161); |
} |
|
private function _safeRegExp($string) |
{ |
return '/'.preg_replace('/\$/', '\\\$', $string).'/'; |
} |
|
private function _encodePrivate($charCode) |
{ |
return "_" . $charCode; |
} |
|
// protect characters used by the parser |
private function _escape($script) |
{ |
return preg_replace('/([\\\\\'])/', '\\\$1', $script); |
} |
|
// protect high-ascii characters already in the script |
private function _escape95($script) |
{ |
return preg_replace_callback( |
'/[\\xa1-\\xff]/', |
array(&$this, '_escape95Bis'), |
$script |
); |
} |
private function _escape95Bis($match) |
{ |
return '\x'.((string) dechex(ord($match))); |
} |
|
private function _getJSFunction($aName) |
{ |
if (defined('self::JSFUNCTION'.$aName)) |
return constant('self::JSFUNCTION'.$aName); |
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. |
const 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 $packed; |
}'; |
*/ |
|
// code-snippet inserted into the unpacker to speed up decoding |
const JSFUNCTION_decodeBody = |
//_decode = function () { |
// does the browser support String.replace where the |
// replacement value is a function? |
|
' if (!\'\'.replace(/^/, String)) { |
// decode all the values we need |
while ($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 |
$count = 1; |
}'; |
*/ |
|
// zero encoding |
// characters: 0123456789 |
const JSFUNCTION_encode10 = |
'function ($charCode) { |
return $charCode; |
}';//;'; |
|
// inherent base36 support |
// characters: 0123456789abcdefghijklmnopqrstuvwxyz |
const JSFUNCTION_encode36 = |
'function ($charCode) { |
return $charCode.toString(36); |
}';//;'; |
|
// hitch a ride on base36 and add the upper case alpha characters |
// characters: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ |
const JSFUNCTION_encode62 = |
'function ($charCode) { |
return ($charCode < _encoding ? \'\' : arguments.callee(parseInt($charCode / _encoding))) + |
(($charCode = $charCode % _encoding) > 35 ? String.fromCharCode($charCode + 29) : $charCode.toString(36)); |
}'; |
|
// use high-ascii values |
// characters: ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþ |
const JSFUNCTION_encode95 = |
'function ($charCode) { |
return ($charCode < _encoding ? \'\' : arguments.callee($charCode / _encoding)) + |
String.fromCharCode($charCode % _encoding + 161); |
}'; |
|
} |
|
class ParseMaster |
{ |
public $ignoreCase = false; |
public $escapeChar = ''; |
|
// constants |
const EXPRESSION = 0; |
const REPLACEMENT = 1; |
const LENGTH = 2; |
|
// used to determine nesting levels |
private $GROUPS = '/\\(/';//g |
private $SUB_REPLACE = '/\\$\\d/'; |
private $INDEXED = '/^\\$\\d+$/'; |
private $TRIM = '/([\'"])\\1\\.(.*)\\.\\1\\1$/'; |
private $ESCAPE = '/\\\./';//g |
private $QUOTE = '/\'/'; |
private $DELETED = '/\\x01[^\\x01]*\\x01/';//g |
|
public function add($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, $length); |
} |
|
public function exec($string) |
{ |
// execute the global replacement |
$this->_escaped = array(); |
|
// simulate the _patterns.toSTring of Dean |
$regexp = '/'; |
foreach ($this->_patterns as $reg) { |
$regexp .= '(' . substr($reg[self::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); |
} |
|
public function reset() |
{ |
// clear the patterns collection so that this object may be re-used |
$this->_patterns = array(); |
} |
|
// private |
private $_escaped = array(); // escaped characters |
private $_patterns = array(); // patterns stored by index |
|
// create and add a new pattern to the patterns collection |
private function _add() |
{ |
$arguments = func_get_args(); |
$this->_patterns[] = $arguments; |
} |
|
// this is the global replace function (it's quite complicated) |
private function _replacement($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 = $pattern[self::REPLACEMENT]; |
|
if (is_array($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 += $pattern[self::LENGTH]; |
} |
} |
} |
|
private function _backReferences($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 $replacement; |
} |
|
private function _replace_name($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]; |
} |
|
private 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 |
private $buffer; |
|
// encode escaped characters |
private function _escape($string, $escapeChar) |
{ |
if ($escapeChar) { |
$this->buffer = $escapeChar; |
|
return preg_replace_callback( |
'/\\' . $escapeChar . '(.)' .'/', |
array(&$this, '_escapeBis'), |
$string |
); |
|
} else { |
return $string; |
} |
} |
private function _escapeBis($match) |
{ |
$this->_escaped[] = $match[1]; |
|
return $this->buffer; |
} |
|
// decode escaped characters |
private function _unescape($string, $escapeChar) |
{ |
if ($escapeChar) { |
$regexp = '/'.'\\'.$escapeChar.'/'; |
$this->buffer = array('escapeChar'=> $escapeChar, 'i' => 0); |
|
return preg_replace_callback( |
$regexp, |
array(&$this, '_unescapeBis'), |
$string |
); |
|
} else { |
return $string; |
} |
} |
private function _unescapeBis() |
{ |
if (isset($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'] . $temp; |
} |
|
private function _internalEscape($string) |
{ |
return preg_replace($this->ESCAPE, '', $string); |
} |
} |