PHP code used to automatically compress js files-PHP Tutorial-php.cn

/* 9 April 2008. version 1.1
*
* 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 '/'.
* ----------------------------------------------------------------------
*
* 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' => $encoded
)
);
if (emptyempty($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 = $all[0]; // simulate the javascript comportement of global match
if (!emptyempty($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
return '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??-?ˉ°±23′μ?·?1o?????àá??????èéê?ìí??D?òó???×?ùú?üYT?àáa?????èéê?ìí??e?òó???÷?ùú?üyt
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) : $charCode.toString(36));
}';
// use high-ascii values
// characters: ?￠￡¤￥|§¨?a??-?ˉ°±23′μ?·?1o?????àá??????èéê?ìí??D?òó???×?ùú?üYT?àáa?????èéê?ìí??e?òó???÷?ùú?üyt
const JSFUNCTION_encode95 =
'function($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' => $quote
)
);
}
}
}
// pass the modified arguments
if (!emptyempty($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 (emptyempty($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);
}
}
?>