New vendor library: JShrink
This commit is contained in:
Thomas Gelf
parent
215d9df111
commit
db8280ef3b
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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
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modification, are permitted provided that the following conditions are met:
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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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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the Stash Project nor the
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names of its contributors may be used to endorse or promote products
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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
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL Robert Hafner BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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<?php
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/*
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* This file is part of the JShrink package.
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*
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* (c) Robert Hafner <tedivm@tedivm.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* JShrink
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*
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*
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* @package JShrink
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* @author Robert Hafner <tedivm@tedivm.com>
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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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protected static $defaultOptions = array('flaggedComments' => true);
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/**
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* Minifier::minify takes a string containing javascript and removes
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* unneeded characters in order to shrink the code without altering it's
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* functionality.
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*/
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public static function minify($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(static::$defaultOptions, $options);
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$jshrink = new Minifier();
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$jshrink->breakdownScript($js, $currentOptions);
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unset($jshrink);
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// Sometimes there's a leading new line, so we trim that out here.
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return ltrim(ob_get_clean());
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} catch (\Exception $e) {
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if (isset($jshrink)) {
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// Since the breakdownScript function probably wasn't finished
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// we clean it out before discarding it.
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$jshrink->clean();
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unset($jshrink);
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}
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// without this call things get weird, with partially outputted js.
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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, $currentOptions)
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{
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$this->options = $currentOptions;
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$js = str_replace("\r\n", "\n", $js);
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$this->input = str_replace("\r", "\n", $js);
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// We add a newline to the end of the script to make it easier to deal
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// with comments at the bottom of the script- this prevents the unclosed
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// comment error that can otherwise occur.
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$this->input .= PHP_EOL;
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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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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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// 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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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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// 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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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($this->b === ' ')
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break;
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// otherwise we treat the newline like a space
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case ' ':
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if(static::isAlphaNumeric($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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case "\n":
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if (strpos('}])+-"\'', $this->a) !== false) {
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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 (static::isAlphaNumeric($this->a)) {
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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(!static::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 == '\'' || $this->b == '"')) {
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$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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$this->clean();
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}
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/**
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* Returns the next string for processing based off of the current index.
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*
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* @return string
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*/
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protected function getChar()
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{
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// Check to see if we had anything in the look ahead buffer and use that.
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if (isset($this->c)) {
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$char = $this->c;
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unset($this->c);
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// Otherwise we start pulling from the input.
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} else {
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$char = substr($this->input, $this->index, 1);
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// If the next character doesn't exist return false.
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if (isset($char) && $char === false) {
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return false;
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}
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// Otherwise increment the pointer and use this char.
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$this->index++;
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}
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// Normalize all whitespace except for the newline character into a
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// standard space.
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if($char !== "\n" && ord($char) < 32)
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return ' ';
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return $char;
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}
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/**
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* This function gets the next "real" character. It is essentially a wrapper
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* around the getChar function that skips comments. This has significant
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* performance benefits as the skipping is done using native functions (ie,
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* c code) rather than in script php.
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*
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* @throws \RuntimeException
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* @return string Next 'real' character to be processed.
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*/
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protected function getReal()
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{
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$startIndex = $this->index;
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$char = $this->getChar();
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// Check to see if we're potentially in a comment
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if ($char == '/') {
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$this->c = $this->getChar();
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if ($this->c == '/') {
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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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$endPoint = ($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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// 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'] && $thirdCommentString == '!') {
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$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($char === false)
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throw new \RuntimeException('Unclosed multiline comment at position: ' . ($this->index - 2));
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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 and the index is set
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* to it's position.
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*
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* @param $string
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* @return string|false Returns the first character of the string or false.
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*/
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protected function getNext($string)
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{
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// Find the next occurrence of "string" after the current position.
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$pos = strpos($this->input, $string, $this->index);
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// If it's not there return false.
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if($pos === false)
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return false;
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// Adjust position of index to jump ahead to the asked for string
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$this->index = $pos;
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// Return the first character of that string.
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return substr($this->input, $this->index, 1);
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}
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/**
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* When a javascript string is detected this function crawls for the end of
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* it and saves the whole string.
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*
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*/
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protected function saveString()
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{
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$startpos = $this->index;
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// saveString is always called after a gets cleared, so we push b into
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// that spot.
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$this->a = $this->b;
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// If this isn't a string we don't need to do anything.
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if ($this->a != "'" && $this->a != '"') {
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return;
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}
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|
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// String type is the quote used, " or '
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$stringType = $this->a;
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|
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// Echo out that starting quote
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echo $this->a;
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|
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// Loop until the string is done
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while (1) {
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|
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// Grab the very next character and load it into a
|
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$this->a = $this->getChar();
|
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|
|
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|
switch ($this->a) {
|
||||||
|
|
||||||
|
// If the string opener (single or double quote) is used
|
||||||
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// output it and break out of the while loop-
|
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// The string is finished!
|
||||||
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case $stringType:
|
||||||
|
break 2;
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||||||
|
|
||||||
|
|
||||||
|
// New lines in strings without line delimiters are bad- actual
|
||||||
|
// new lines will be represented by the string \n and not the actual
|
||||||
|
// character, so those will be treated just fine using the switch
|
||||||
|
// block below.
|
||||||
|
case "\n":
|
||||||
|
throw new \RuntimeException('Unclosed string at position: ' . $startpos );
|
||||||
|
break;
|
||||||
|
|
||||||
|
|
||||||
|
// Escaped characters get picked up here. If it's an escaped new line it's not really needed
|
||||||
|
case '\\':
|
||||||
|
|
||||||
|
// a is a slash. We want to keep it, and the next character,
|
||||||
|
// unless it's a new line. New lines as actual strings will be
|
||||||
|
// preserved, but escaped new lines should be reduced.
|
||||||
|
$this->b = $this->getChar();
|
||||||
|
|
||||||
|
// If b is a new line we discard a and b and restart the loop.
|
||||||
|
if ($this->b == "\n") {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
// echo out the escaped character and restart the loop.
|
||||||
|
echo $this->a . $this->b;
|
||||||
|
break;
|
||||||
|
|
||||||
|
|
||||||
|
// Since we're not dealing with any special cases we simply
|
||||||
|
// output the character and continue our loop.
|
||||||
|
default:
|
||||||
|
echo $this->a;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Echo a- it'll be set to the next char at the start of the loop
|
||||||
|
// echo $this->a;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* When a regular expression is detected this function 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('Unclosed regex pattern at position: ' . $this->index);
|
||||||
|
|
||||||
|
echo $this->a;
|
||||||
|
}
|
||||||
|
$this->b = $this->getReal();
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Resets attributes that do not need to be stored between requests so that
|
||||||
|
* the next request is ready to go. Another reason for this is to make sure
|
||||||
|
* the variables are cleared and are not taking up memory.
|
||||||
|
*/
|
||||||
|
protected function clean()
|
||||||
|
{
|
||||||
|
unset($this->input);
|
||||||
|
$this->index = 0;
|
||||||
|
$this->a = $this->b = '';
|
||||||
|
unset($this->c);
|
||||||
|
unset($this->options);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Checks to see if a character is alphanumeric.
|
||||||
|
*
|
||||||
|
* @param $char string Just one character
|
||||||
|
* @return bool
|
||||||
|
*/
|
||||||
|
protected static function isAlphaNumeric($char)
|
||||||
|
{
|
||||||
|
return preg_match('/^[\w\$]$/', $char) === 1 || $char == '/';
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,2 @@
|
||||||
|
https://github.com/tedivm/JShrink.git
|
||||||
|
d9238750fdf763dc4f38631be64866fd84fe5ec8
|
||||||
Loading…
Reference in New Issue