333 lines
7.8 KiB
PHP
333 lines
7.8 KiB
PHP
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<?php
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/*
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JShrink
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Copyright (c) 2009, Robert Hafner
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list of conditions and the following
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disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other materials provided with the distribution.
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* Neither the name of the <ORGANIZATION> nor the names of its contributors may be used to endorse or promote
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products derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* JShrink
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*
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* Usage - JShrink::minify($js);
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* Usage - JShrink::minify($js, $options);
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* Usage - JShrink::minify($js, array('flaggedComments' => false));
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*
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* @version 0.2
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* @package JShrink
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* @author Robert Hafner <tedivm@tedivm.com>
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* @license http://www.opensource.org/licenses/bsd-license.php
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*/
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class JShrink
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{
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protected $input;
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protected $index = 0;
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protected $a = '';
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protected $b = '';
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protected $c;
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protected $options;
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static protected $defaultOptions = array('flaggedComments' => true);
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static public function minify($js, $options = array())
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{
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try{
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$currentOptions = array_merge(self::$defaultOptions, $options);
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ob_start();
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$currentOptions = array_merge(self::$defaultOptions, $options);
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$me = new JShrink();
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$me->breakdownScript($js, $currentOptions);
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$output = ob_get_clean();
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return $output;
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}catch(Exception $e){
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ob_end_clean();
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throw $e;
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}
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}
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protected function breakdownScript($js, $currentOptions)
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{
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$this->options = $currentOptions;
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$js = str_replace("\r\n", "\n", $js);
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$this->input = str_replace("\r", "\n", $js);
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$this->a = $this->getReal();
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// the only time the length can be higher than 1 is if a conditional comment needs to be displayed
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// and the only time that can happen for $a is on the very first run
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while(strlen($this->a) > 1)
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{
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echo $this->a;
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$this->a = $this->getReal();
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}
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$this->b = $this->getReal();
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while($this->a !== false && !is_null($this->a) && $this->a !== '')
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{
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// now we give $b the same check for conditional comments we gave $a before we began looping
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if(strlen($this->b) > 1)
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{
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echo $this->a . $this->b;
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$this->a = $this->getReal();
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$this->b = $this->getReal();
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continue;
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}
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switch($this->a)
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{
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// new lines
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case "\n":
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// if the next line is something that can't stand alone preserver the newline
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if(strpos('(-+{[@', $this->b) !== false)
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{
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echo $this->a;
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$this->saveString();
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break;
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}
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// if its a space we move down to the string test below
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if($this->b === ' ')
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break;
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// otherwise we treat the newline like a space
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case ' ':
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if(self::isAlphaNumeric($this->b))
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echo $this->a;
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$this->saveString();
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break;
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default:
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switch($this->b)
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{
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case "\n":
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if(strpos('}])+-"\'', $this->a) !== false)
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{
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echo $this->a;
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$this->saveString();
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break;
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}else{
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if(self::isAlphaNumeric($this->a))
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{
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echo $this->a;
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$this->saveString();
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}
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}
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break;
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case ' ':
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if(!self::isAlphaNumeric($this->a))
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break;
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default:
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// check for some regex that breaks stuff
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if($this->a == '/' && ($this->b == '\'' || $this->b == '"'))
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{
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$this->saveRegex();
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continue;
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}
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echo $this->a;
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$this->saveString();
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break;
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}
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}
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// do reg check of doom
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$this->b = $this->getReal();
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if(($this->b == '/' && strpos('(,=:[!&|?', $this->a) !== false))
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$this->saveRegex();
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}
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}
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protected function getChar()
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{
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if(isset($this->c))
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{
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$char = $this->c;
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unset($this->c);
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}else{
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if(isset($this->input[$this->index]))
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{
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$char = $this->input[$this->index];
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$this->index++;
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}else{
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return false;
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}
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}
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if($char === "\n" || ord($char) >= 32)
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return $char;
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return ' ';
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}
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protected function getReal()
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{
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$startIndex = $this->index;
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$char = $this->getChar();
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if($char == '/')
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{
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$this->c = $this->getChar();
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if($this->c == '/')
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{
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$thirdCommentString = $this->input[$this->index];
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// kill rest of line
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$char = $this->getNext("\n");
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if($thirdCommentString == '@')
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{
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$endPoint = ($this->index) - $startIndex;
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unset($this->c);
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$char = "\n" . substr($this->input, $startIndex, $endPoint);// . "\n";
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}else{
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$char = $this->getChar();
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$char = $this->getChar();
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}
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}elseif($this->c == '*'){
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$this->getChar(); // current C
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$thirdCommentString = $this->getChar();
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if($thirdCommentString == '@')
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{
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// we're gonna back up a bit and and send the comment back, where the first
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// char will be echoed and the rest will be treated like a string
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$this->index = $this->index-2;
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return '/';
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}elseif($this->getNext('*/')){
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// kill everything up to the next */
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$this->getChar(); // get *
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$this->getChar(); // get /
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$char = $this->getChar(); // get next real charactor
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// if YUI-style comments are enabled we reinsert it into the stream
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if($this->options['flaggedComments'] && $thirdCommentString == '!')
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{
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$endPoint = ($this->index - 1) - $startIndex;
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echo "\n" . substr($this->input, $startIndex, $endPoint) . "\n";
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}
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}else{
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$char = false;
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}
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if($char === false)
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throw new JShrinkException('Stray comment. ' . $this->index);
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// if we're here c is part of the comment and therefore tossed
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if(isset($this->c))
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unset($this->c);
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}
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}
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return $char;
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}
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protected function getNext($string)
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{
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$pos = strpos($this->input, $string, $this->index);
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if($pos === false)
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return false;
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$this->index = $pos ;
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return $this->input[$this->index];
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}
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protected function saveString()
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{
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$this->a = $this->b;
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if($this->a == '\'' || $this->a == '"')
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{
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// save literal string
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$stringType = $this->a;
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while(1)
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{
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echo $this->a;
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$this->a = $this->getChar();
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switch($this->a)
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{
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case $stringType:
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break 2;
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case "\n":
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throw new JShrinkException('Unclosed string. ' . $this->index);
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break;
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case '\\':
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echo $this->a;
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$this->a = $this->getChar();
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}
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}
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}
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}
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protected function saveRegex()
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{
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echo $this->a . $this->b;
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while(($this->a = $this->getChar()) !== false)
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{
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if($this->a == '/')
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break;
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if($this->a == '\\')
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{
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echo $this->a;
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$this->a = $this->getChar();
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}
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if($this->a == "\n")
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throw new JShrinkException('Stray regex pattern. ' . $this->index);
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echo $this->a;
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}
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$this->b = $this->getReal();
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}
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static protected function isAlphaNumeric($char)
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{
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return preg_match('/^[\w\$]$/', $char) === 1 || $char == '/';
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}
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}
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// Adding a custom exception handler for your own projects just means changing this line
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class JShrinkException extends Exception {}
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?>
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