1 /*
\r packer, version 2.0.2 (2005-08-19)
\r Copyright 2004-2005, Dean Edwards
\r License: http://creativecommons.org/licenses/LGPL/2.1/
\r*/
\r\rfunction pack(_script, _encoding, _fastDecode, _specialChars) {
\r // constants
\r var $IGNORE = "$1";
\r\r // validate parameters
\r _script += "\n";
\r _encoding = Math.min(parseInt(_encoding), 95);
\r\r // apply all parsing routines
\r function _pack($script) {
\r var i, $parse;
\r for (i = 0; ($parse = _parsers[i]); i++) {
\r $script = $parse($script);
\r }
\r return $script;
\r };
\r\r // unpacking function - this is the boot strap function
\r // data extracted from this packing routine is passed to
\r // this function when decoded in the target
\r var _unpack = function($packed, $ascii, $count, $keywords, $encode, $decode) {
\r while ($count--)
\r if ($keywords[$count])
\r $packed = $packed.replace(new RegExp('\\b' + $encode($count) + '\\b', 'g'), $keywords[$count]);
\r return $packed;
\r };
\r\r // code-snippet inserted into the unpacker to speed up decoding
\r var _decode = function() {
\r // does the browser support String.replace where the
\r // replacement value is a function?
\r if (!''.replace(/^/, String)) {
\r // decode all the values we need
\r while ($count--) $decode[$encode($count)] = $keywords[$count] || $encode($count);
\r // global replacement function
\r $keywords = [function($encoded){return $decode[$encoded]}];
\r // generic match
\r $encode = function(){return'\\w+'};
\r // reset the loop counter - we are now doing a global replace
\r $count = 1;
\r }
\r };
\r\r // keep a list of parsing functions, they'll be executed all at once
\r var _parsers = [];
\r function _addParser($parser) {
\r _parsers[_parsers.length] = $parser;
\r };
\r\r // zero encoding - just removal of white space and comments
\r function _basicCompression($script) {
\r var $parser = new ParseMaster;
\r // make safe
\r $parser.escapeChar = "\\";
\r // protect strings
\r $parser.add(/'[^'\n\r]*'/, $IGNORE);
\r $parser.add(/"[^"\n\r]*"/, $IGNORE);
\r // remove comments
\r $parser.add(/\/\/[^\n\r]*[\n\r]/, " ");
\r $parser.add(/\/\*[^*]*\*+([^\/][^*]*\*+)*\//, " ");
\r // protect regular expressions
\r $parser.add(/\s+(\/[^\/\n\r\*][^\/\n\r]*\/g?i?)/, "$2"); // IGNORE
\r $parser.add(/[^\w\x24\/'"*)\?:]\/[^\/\n\r\*][^\/\n\r]*\/g?i?/, $IGNORE);
\r // remove: ;;; doSomething();
\r if (_specialChars) $parser.add(/;;;[^\n\r]+[\n\r]/);
\r // remove redundant semi-colons
\r $parser.add(/\(;;\)/, $IGNORE); // protect for (;;) loops
\r $parser.add(/;+\s*([};])/, "$2");
\r // apply the above
\r $script = $parser.exec($script);
\r\r // remove white-space
\r $parser.add(/(\b|\x24)\s+(\b|\x24)/, "$2 $3");
\r $parser.add(/([+\-])\s+([+\-])/, "$2 $3");
\r $parser.add(/\s+/, "");
\r // done
\r return $parser.exec($script);
\r };
\r\r function _encodeSpecialChars($script) {
\r var $parser = new ParseMaster;
\r // replace: $name -> n, $$name -> na
\r $parser.add(/((\x24+)([a-zA-Z$_]+))(\d*)/, function($match, $offset) {
\r var $length = $match[$offset + 2].length;
\r var $start = $length - Math.max($length - $match[$offset + 3].length, 0);
\r return $match[$offset + 1].substr($start, $length) + $match[$offset + 4];
\r });
\r // replace: _name -> _0, double-underscore (__name) is ignored
\r var $regexp = /\b_[A-Za-z\d]\w*/;
\r // build the word list
\r var $keywords = _analyze($script, _globalize($regexp), _encodePrivate);
\r // quick ref
\r var $encoded = $keywords.$encoded;
\r $parser.add($regexp, function($match, $offset) {
\r return $encoded[$match[$offset]];
\r });
\r return $parser.exec($script);
\r };
\r\r function _encodeKeywords($script) {
\r // escape high-ascii values already in the script (i.e. in strings)
\r if (_encoding > 62) $script = _escape95($script);
\r // create the parser
\r var $parser = new ParseMaster;
\r var $encode = _getEncoder(_encoding);
\r // for high-ascii, don't encode single character low-ascii
\r var $regexp = (_encoding > 62) ? /\w\w+/ : /\w+/;
\r // build the word list
\r $keywords = _analyze($script, _globalize($regexp), $encode);
\r var $encoded = $keywords.$encoded;
\r // encode
\r $parser.add($regexp, function($match, $offset) {
\r return $encoded[$match[$offset]];
\r });
\r // if encoded, wrap the script in a decoding function
\r return $script && _bootStrap($parser.exec($script), $keywords);
\r };
\r\r function _analyze($script, $regexp, $encode) {
\r // analyse
\r // retreive all words in the script
\r var $all = $script.match($regexp);
\r var $$sorted = []; // list of words sorted by frequency
\r var $$encoded = {}; // dictionary of word->encoding
\r var $$protected = {}; // instances of "protected" words
\r if ($all) {
\r var $unsorted = []; // same list, not sorted
\r var $protected = {}; // "protected" words (dictionary of word->"word")
\r var $values = {}; // dictionary of charCode->encoding (eg. 256->ff)
\r var $count = {}; // word->count
\r var i = $all.length, j = 0, $word;
\r // count the occurrences - used for sorting later
\r do {
\r $word = "$" + $all[--i];
\r if (!$count[$word]) {
\r $count[$word] = 0;
\r $unsorted[j] = $word;
\r // make a dictionary of all of the protected words in this script
\r // these are words that might be mistaken for encoding
\r $protected["$" + ($values[j] = $encode(j))] = j++;
\r }
\r // increment the word counter
\r $count[$word]++;
\r } while (i);
\r // prepare to sort the word list, first we must protect
\r // words that are also used as codes. we assign them a code
\r // equivalent to the word itself.
\r // e.g. if "do" falls within our encoding range
\r // then we store keywords["do"] = "do";
\r // this avoids problems when decoding
\r i = $unsorted.length;
\r do {
\r $word = $unsorted[--i];
\r if ($protected[$word] != null) {
\r $$sorted[$protected[$word]] = $word.slice(1);
\r $$protected[$protected[$word]] = true;
\r $count[$word] = 0;
\r }
\r } while (i);
\r // sort the words by frequency
\r $unsorted.sort(function($match1, $match2) {
\r return $count[$match2] - $count[$match1];
\r });
\r j = 0;
\r // because there are "protected" words in the list
\r // we must add the sorted words around them
\r do {
\r if ($$sorted[i] == null) $$sorted[i] = $unsorted[j++].slice(1);
\r $$encoded[$$sorted[i]] = $values[i];
\r } while (++i < $unsorted.length);
\r }
\r return {$sorted: $$sorted, $encoded: $$encoded, $protected: $$protected};
\r };
\r\r // build the boot function used for loading and decoding
\r function _bootStrap($packed, $keywords) {
\r var $ENCODE = _safeRegExp("$encode\\($count\\)", "g");
\r\r // $packed: the packed script
\r $packed = "'" + _escape($packed) + "'";
\r\r // $ascii: base for encoding
\r var $ascii = Math.min($keywords.$sorted.length, _encoding) || 1;
\r\r // $count: number of words contained in the script
\r var $count = $keywords.$sorted.length;
\r\r // $keywords: list of words contained in the script
\r for (var i in $keywords.$protected) $keywords.$sorted[i] = "";
\r // convert from a string to an array
\r $keywords = "'" + $keywords.$sorted.join("|") + "'.split('|')";
\r\r // $encode: encoding function (used for decoding the script)
\r var $encode = _encoding > 62 ? _encode95 : _getEncoder($ascii);
\r $encode = String($encode).replace(/_encoding/g, "$ascii").replace(/arguments\.callee/g, "$encode");
\r var $inline = "$count" + ($ascii > 10 ? ".toString($ascii)" : "");
\r\r // $decode: code snippet to speed up decoding
\r if (_fastDecode) {
\r // create the decoder
\r var $decode = _getFunctionBody(_decode);
\r if (_encoding > 62) $decode = $decode.replace(/\\\\w/g, "[\\xa1-\\xff]");
\r // perform the encoding inline for lower ascii values
\r else if ($ascii < 36) $decode = $decode.replace($ENCODE, $inline);
\r // special case: when $count==0 there are no keywords. I want to keep
\r // the basic shape of the unpacking funcion so i'll frig the code...
\r if (!$count) $decode = $decode.replace(_safeRegExp("($count)\\s*=\\s*1"), "$1=0");
\r }
\r\r // boot function
\r var $unpack = String(_unpack);
\r if (_fastDecode) {
\r // insert the decoder
\r $unpack = $unpack.replace(/\{/, "{" + $decode + ";");
\r }
\r $unpack = $unpack.replace(/"/g, "'");
\r if (_encoding > 62) { // high-ascii
\r // get rid of the word-boundaries for regexp matches
\r $unpack = $unpack.replace(/'\\\\b'\s*\+|\+\s*'\\\\b'/g, "");
\r }
\r if ($ascii > 36 || _encoding > 62 || _fastDecode) {
\r // insert the encode function
\r $unpack = $unpack.replace(/\{/, "{$encode=" + $encode + ";");
\r } else {
\r // perform the encoding inline
\r $unpack = $unpack.replace($ENCODE, $inline);
\r }
\r // pack the boot function too
\r $unpack = pack($unpack, 0, false, true);
\r\r // arguments
\r var $params = [$packed, $ascii, $count, $keywords];
\r if (_fastDecode) {
\r // insert placeholders for the decoder
\r $params = $params.concat(0, "{}");
\r }
\r\r // the whole thing
\r return "eval(" + $unpack + "(" + $params + "))\n";
\r };
\r\r // mmm.. ..which one do i need ??
\r function _getEncoder($ascii) {
\r return $ascii > 10 ? $ascii > 36 ? $ascii > 62 ? _encode95 : _encode62 : _encode36 : _encode10;
\r };
\r\r // zero encoding
\r // characters: 0123456789
\r var _encode10 = function($charCode) {
\r return $charCode;
\r };
\r\r // inherent base36 support
\r // characters: 0123456789abcdefghijklmnopqrstuvwxyz
\r var _encode36 = function($charCode) {
\r return $charCode.toString(36);
\r };
\r\r // hitch a ride on base36 and add the upper case alpha characters
\r // characters: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
\r var _encode62 = function($charCode) {
\r return ($charCode < _encoding ? '' : arguments.callee(parseInt($charCode / _encoding))) +
\r (($charCode = $charCode % _encoding) > 35 ? String.fromCharCode($charCode + 29) : $charCode.toString(36));
\r };
\r\r // use high-ascii values
\r var _encode95 = function($charCode) {
\r return ($charCode < _encoding ? '' : arguments.callee($charCode / _encoding)) +
\r String.fromCharCode($charCode % _encoding + 161);
\r };
\r\r // special _chars
\r var _encodePrivate = function($charCode) {
\r return "_" + $charCode;
\r };
\r\r // protect characters used by the parser
\r function _escape($script) {
\r return $script.replace(/([\\'])/g, "\\$1");
\r };
\r\r // protect high-ascii characters already in the script
\r function _escape95($script) {
\r return $script.replace(/[\xa1-\xff]/g, function($match) {
\r return "\\x" + $match.charCodeAt(0).toString(16);
\r });
\r };
\r\r function _safeRegExp($string, $flags) {
\r return new RegExp($string.replace(/\$/g, "\\$"), $flags);
\r };
\r\r // extract the body of a function
\r function _getFunctionBody($function) {
\r with (String($function)) return slice(indexOf("{") + 1, lastIndexOf("}"));
\r };
\r\r // set the global flag on a RegExp (you have to create a new one)
\r function _globalize($regexp) {
\r return new RegExp(String($regexp).slice(1, -1), "g");
\r };
\r\r // build the parsing routine
\r _addParser(_basicCompression);
\r if (_specialChars) _addParser(_encodeSpecialChars);
\r if (_encoding) _addParser(_encodeKeywords);
\r\r // go!
\r return _pack(_script);
\r};
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