class JavaScriptPacker in Advanced CSS/JS Aggregation 6
Same name and namespace in other branches
- 8.4 advagg_js_minify/jspacker.inc \JavaScriptPacker
- 8.2 advagg_js_minify/jspacker.inc \JavaScriptPacker
- 8.3 advagg_js_minify/jspacker.inc \JavaScriptPacker
- 7.2 advagg_js_compress/jspacker.inc \JavaScriptPacker
- 7 advagg_js_compress/jspacker.inc \JavaScriptPacker
Hierarchy
- class \JavaScriptPacker
Expanded class hierarchy of JavaScriptPacker
File
- advagg_js_compress/
jspacker.inc, line 69
View source
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])) {
$_sorted[$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]', $decode);
}
elseif ($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«¬®¯°±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 $packed;
}';
*/
// code-snippet inserted into the unpacker to speed up decoding
const JSFUNCTION_decodeBody = ' if (!\'\'.replace(/^/, String)) {
// decode all the values we need
while ($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);
}';
}