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+<?php
+/**
+ * JShrink
+ *
+ * Copyright (c) 2009-2012, Robert Hafner <tedivm@tedivm.com>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * * Neither the name of Robert Hafner nor the names of his
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @package JShrink
+ * @author Robert Hafner <tedivm@tedivm.com>
+ * @copyright 2009-2012 Robert Hafner <tedivm@tedivm.com>
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD License
+ * @link https://github.com/tedivm/JShrink
+ * @version Release: 0.5.1
+ */
+
+
+/**
+ * JShrink_Minifier
+ *
+ * Usage - JShrink_Minifier::minify($js);
+ * Usage - JShrink_Minifier::minify($js, $options);
+ * Usage - JShrink_Minifier::minify($js, array('flaggedComments' => false));
+ *
+ * @package JShrink
+ * @author Robert Hafner <tedivm@tedivm.com>
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD License
+ */
+class JShrink_Minifier
+{
+ /**
+ * The input javascript to be minified.
+ *
+ * @var string
+ */
+ protected $input;
+
+ /**
+ * The location of the character (in the input string) that is next to be
+ * processed.
+ *
+ * @var int
+ */
+ protected $index = 0;
+
+ /**
+ * The first of the characters currently being looked at.
+ *
+ * @var string
+ */
+ protected $a = '';
+
+
+ /**
+ * The next character being looked at (after a);
+ *
+ * @var string
+ */
+ protected $b = '';
+
+ /**
+ * This character is only active when certain look ahead actions take place.
+ *
+ * @var string
+ */
+ protected $c;
+
+ /**
+ * Contains the options for the current minification process.
+ *
+ * @var array
+ */
+ protected $options;
+
+ /**
+ * Contains the default options for minification. This array is merged with
+ * the one passed in by the user to create the request specific set of
+ * options (stored in the $options attribute).
+ *
+ * @var array
+ */
+ static protected $defaultOptions = array('flaggedComments' => true);
+
+ /**
+ * Contains a copy of the JShrink object used to run minification. This is
+ * only used internally, and is only stored for performance reasons. There
+ * is no internal data shared between minification requests.
+ */
+ static protected $jshrink;
+
+ /**
+ * Minifier::minify takes a string containing javascript and removes
+ * unneeded characters in order to shrink the code without altering it's
+ * functionality.
+ */
+ static public function minify($js, $options = array())
+ {
+ try{
+ ob_start();
+ $currentOptions = array_merge(self::$defaultOptions, $options);
+
+ if(!isset(self::$jshrink))
+ self::$jshrink = new JShrink_Minifier();
+
+ self::$jshrink->breakdownScript($js, $currentOptions);
+ return ob_get_clean();
+
+ }catch(Exception $e){
+ if(isset(self::$jshrink))
+ self::$jshrink->clean();
+
+ ob_end_clean();
+ throw $e;
+ }
+ }
+
+ /**
+ * Processes a javascript string and outputs only the required characters,
+ * stripping out all unneeded characters.
+ *
+ * @param string $js The raw javascript to be minified
+ * @param array $currentOptions Various runtime options in an associative array
+ */
+ protected function breakdownScript($js, $currentOptions)
+ {
+ // reset work attributes in case this isn't the first run.
+ $this->clean();
+
+ $this->options = $currentOptions;
+
+ $js = str_replace("\r\n", "\n", $js);
+ $this->input = str_replace("\r", "\n", $js);
+
+
+ $this->a = $this->getReal();
+
+ // the only time the length can be higher than 1 is if a conditional
+ // comment needs to be displayed and the only time that can happen for
+ // $a is on the very first run
+ while(strlen($this->a) > 1)
+ {
+ echo $this->a;
+ $this->a = $this->getReal();
+ }
+
+ $this->b = $this->getReal();
+
+ while($this->a !== false && !is_null($this->a) && $this->a !== '')
+ {
+
+ // now we give $b the same check for conditional comments we gave $a
+ // before we began looping
+ if(strlen($this->b) > 1)
+ {
+ echo $this->a . $this->b;
+ $this->a = $this->getReal();
+ $this->b = $this->getReal();
+ continue;
+ }
+
+ switch($this->a)
+ {
+ // new lines
+ case "\n":
+ // if the next line is something that can't stand alone
+ // preserve the newline
+ if(strpos('(-+{[@', $this->b) !== false)
+ {
+ echo $this->a;
+ $this->saveString();
+ break;
+ }
+
+ // if its a space we move down to the string test below
+ if($this->b === ' ')
+ break;
+
+ // otherwise we treat the newline like a space
+
+ case ' ':
+ if(self::isAlphaNumeric($this->b))
+ echo $this->a;
+
+ $this->saveString();
+ break;
+
+ default:
+ switch($this->b)
+ {
+ case "\n":
+ if(strpos('}])+-"\'', $this->a) !== false)
+ {
+ echo $this->a;
+ $this->saveString();
+ break;
+ }else{
+ if(self::isAlphaNumeric($this->a))
+ {
+ echo $this->a;
+ $this->saveString();
+ }
+ }
+ break;
+
+ case ' ':
+ if(!self::isAlphaNumeric($this->a))
+ break;
+
+ default:
+ // check for some regex that breaks stuff
+ if($this->a == '/' && ($this->b == '\'' || $this->b == '"'))
+ {
+ $this->saveRegex();
+ continue;
+ }
+
+ echo $this->a;
+ $this->saveString();
+ break;
+ }
+ }
+
+ // do reg check of doom
+ $this->b = $this->getReal();
+
+ if(($this->b == '/' && strpos('(,=:[!&|?', $this->a) !== false))
+ $this->saveRegex();
+ }
+ $this->clean();
+ }
+
+ /**
+ * Returns the next string for processing based off of the current index.
+ *
+ * @return string
+ */
+ protected function getChar()
+ {
+ if(isset($this->c))
+ {
+ $char = $this->c;
+ unset($this->c);
+ }else{
+ $tchar = substr($this->input, $this->index, 1);
+ if(isset($tchar) && $tchar !== false)
+ {
+ $char = $tchar;
+ $this->index++;
+ }else{
+ return false;
+ }
+ }
+
+ if($char !== "\n" && ord($char) < 32)
+ return ' ';
+
+ return $char;
+ }
+
+ /**
+ * This function gets the next "real" character. It is essentially a wrapper
+ * around the getChar function that skips comments. This has significant
+ * performance benefits as the skipping is done using native functions (ie,
+ * c code) rather than in script php.
+ *
+ * @return string Next 'real' character to be processed.
+ */
+ protected function getReal()
+ {
+ $startIndex = $this->index;
+ $char = $this->getChar();
+
+ if($char == '/')
+ {
+ $this->c = $this->getChar();
+
+ if($this->c == '/')
+ {
+ $thirdCommentString = substr($this->input, $this->index, 1);
+
+ // kill rest of line
+ $char = $this->getNext("\n");
+
+ if($thirdCommentString == '@')
+ {
+ $endPoint = ($this->index) - $startIndex;
+ unset($this->c);
+ $char = "\n" . substr($this->input, $startIndex, $endPoint);
+ }else{
+ $char = $this->getChar();
+ $char = $this->getChar();
+ }
+
+ }elseif($this->c == '*'){
+
+ $this->getChar(); // current C
+ $thirdCommentString = $this->getChar();
+
+ if($thirdCommentString == '@')
+ {
+ // conditional comment
+
+ // we're gonna back up a bit and and send the comment back,
+ // where the first char will be echoed and the rest will be
+ // treated like a string
+ $this->index = $this->index-2;
+ return '/';
+
+ }elseif($this->getNext('*/')){
+ // kill everything up to the next */
+
+ $this->getChar(); // get *
+ $this->getChar(); // get /
+
+ $char = $this->getChar(); // get next real character
+
+ // if YUI-style comments are enabled we reinsert it into the stream
+ if($this->options['flaggedComments'] && $thirdCommentString == '!')
+ {
+ $endPoint = ($this->index - 1) - $startIndex;
+ echo "\n" . substr($this->input, $startIndex, $endPoint) . "\n";
+ }
+
+ }else{
+ $char = false;
+ }
+
+ if($char === false)
+ throw new RuntimeException('Stray comment. ' . $this->index);
+
+ // if we're here c is part of the comment and therefore tossed
+ if(isset($this->c))
+ unset($this->c);
+ }
+ }
+ return $char;
+ }
+
+ /**
+ * Pushes the index ahead to the next instance of the supplied string. If it
+ * is found the first character of the string is returned.
+ *
+ * @return string|false Returns the first character of the string or false.
+ */
+ protected function getNext($string)
+ {
+ $pos = strpos($this->input, $string, $this->index);
+
+ if($pos === false)
+ return false;
+
+ $this->index = $pos;
+ return substr($this->input, $this->index, 1);
+ }
+
+ /**
+ * When a javascript string is detected this function crawls for the end of
+ * it and saves the whole string.
+ *
+ */
+ protected function saveString()
+ {
+ $this->a = $this->b;
+ if($this->a == "'" || $this->a == '"') // is the character a quote
+ {
+ // save literal string
+ $stringType = $this->a;
+
+ while(1)
+ {
+ echo $this->a;
+ $this->a = $this->getChar();
+
+ switch($this->a)
+ {
+ case $stringType:
+ break 2;
+
+ case "\n":
+ throw new RuntimeException('Unclosed string. ' . $this->index);
+ break;
+
+ case '\\':
+ echo $this->a;
+ $this->a = $this->getChar();
+ }
+ }
+ }
+ }
+
+ /**
+ * When a regular expression is detected this funcion crawls for the end of
+ * it and saves the whole regex.
+ */
+ protected function saveRegex()
+ {
+ echo $this->a . $this->b;
+
+ while(($this->a = $this->getChar()) !== false)
+ {
+ if($this->a == '/')
+ break;
+
+ if($this->a == '\\')
+ {
+ echo $this->a;
+ $this->a = $this->getChar();
+ }
+
+ if($this->a == "\n")
+ throw new RuntimeException('Stray regex pattern. ' . $this->index);
+
+ echo $this->a;
+ }
+ $this->b = $this->getReal();
+ }
+
+ /**
+ * Resets attributes that do not need to be stored between requests so that
+ * the next request is ready to go.
+ */
+ protected function clean()
+ {
+ unset($this->input);
+ $this->index = 0;
+ $this->a = $this->b = '';
+ unset($this->c);
+ unset($this->options);
+ }
+
+ /**
+ * Checks to see if a character is alphanumeric.
+ *
+ * @return bool
+ */
+ static protected function isAlphaNumeric($char)
+ {
+ return preg_match('/^[\w\$]$/', $char) === 1 || $char == '/';
+ }
+
+} \ No newline at end of file
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 22:19:32 +0000