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