Same name in other branches
  1. 5.0.x advagg_js_minify/jspacker.inc \JavaScriptPacker::_analyze()
  2. 6.0.x advagg_js_minify/jspacker.inc \JavaScriptPacker::_analyze()
  3. 7.x-1.x advagg_js_compress/jspacker.inc \JavaScriptPacker::_analyze()
  4. 8.x-2.x advagg_js_minify/jspacker.inc \JavaScriptPacker::_analyze()
  5. 8.x-3.x advagg_js_minify/jspacker.inc \JavaScriptPacker::_analyze()
  6. 8.x-4.x advagg_js_minify/jspacker.inc \JavaScriptPacker::_analyze()
2 calls to JavaScriptPacker::_analyze()
JavaScriptPacker::_encodeKeywords in advagg_js_compress/jspacker.inc
JavaScriptPacker::_encodeSpecialChars in advagg_js_compress/jspacker.inc

File

advagg_js_compress/jspacker.inc, line 225

Class

JavaScriptPacker

Code

private function _analyze($script, $regexp, $encode) {
    // analyse
    // retrieve 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,
    );
}