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<?php
/**
* @package Lib_Compojoom
* @author DanielDimitrov <daniel@compojoom.com>
* @date 20.08.14
*
* @copyright Copyright (C) 2008 - 2013 compojoom.com . All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('_JEXEC') or die('Restricted access');
/**
* This file is part of the JShrink package.
*
* @link https://github.com/tedious/JShrink
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
*
* (c) Robert Hafner <tedivm@tedivm.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* Copyright (c) 2009, Robert Hafner
* 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 the Stash Project nor the
* names of its 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 Robert Hafner 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.
*/
/**
* JShrink
*
*
* @package JShrink
* @author Robert Hafner <tedivm@tedivm.com>
*/
/**
* This is the original Minifier class. I've renamed it to CompojoomMinifier in order for it
* to be autoloaded with our library. Other than that all functions from jshrink are the same
*
* Usage - CompojoomMinifier::minify($js);
* Usage - CompojoomMinifier::minify($js, $options);
* Usage - CompojoomMinifier::minify($js, array('flaggedComments' => false));
*
* @since 4.0
*/
class CompojoomMinifier
{
/**
* 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
*/
protected static $defaultOptions = array('flaggedComments' => true);
/**
* Contains lock ids which are used to replace certain code patterns and
* prevent them from being minified
*
* @var array
*/
protected $locks = array();
/**
* Takes a string containing javascript and removes unneeded characters in
* order to shrink the code without altering it's functionality.
*
* @param string $js The raw javascript to be minified
* @param array $options Various runtime options in an associative array
*
* @throws \Exception
* @return bool|string
*/
public static function minify($js, $options = array())
{
try
{
ob_start();
$jshrink = new CompojoomMinifier;
$js = $jshrink->lock($js);
$jshrink->minifyDirectToOutput($js, $options);
// Sometimes there's a leading new line, so we trim that out here.
$js = ltrim(ob_get_clean());
$js = $jshrink->unlock($js);
unset($jshrink);
return $js;
}
catch (\Exception $e)
{
if (isset($jshrink))
{
// Since the breakdownScript function probably wasn't finished
// we clean it out before discarding it.
$jshrink->clean();
unset($jshrink);
}
// Without this call things get weird, with partially outputted js.
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 $options Various runtime options in an associative array
*
* @return void
*/
protected function minifyDirectToOutput($js, $options)
{
$this->initialize($js, $options);
$this->loop();
$this->clean();
}
/**
* Initializes internal variables, normalizes new lines,
*
* @param string $js The raw javascript to be minified
* @param array $options Various runtime options in an associative array
*
* @return void
*/
protected function initialize($js, $options)
{
$this->options = array_merge(static::$defaultOptions, $options);
$js = str_replace("\r\n", "\n", $js);
$this->input = str_replace("\r", "\n", $js);
/**
* We add a newline to the end of the script to make it easier to deal
* with comments at the bottom of the script- this prevents the unclosed
* comment error that can otherwise occur.
*/
$this->input .= PHP_EOL;
// Populate "a" with a new line, "b" with the first character, before entering the loop
$this->a = "\n";
$this->b = $this->getReal();
}
/**
* The primary action occurs here. This function loops through the input string,
* outputting anything that's relevant and discarding anything that is not.
*
* @return void
*/
protected function loop()
{
while ($this->a !== false && !is_null($this->a) && $this->a !== '')
{
switch ($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 B is a space we skip the rest of the switch block and go down to the
// String/regex check below, resetting $this->b with getReal
if ($this->b === ' ')
{
break;
}
// Otherwise we treat the newline like a space
case ' ':
if (static::isAlphaNumeric($this->b))
{
echo $this->a;
}
$this->saveString();
break;
default:
switch ($this->b)
{
case "\n":
if (strpos('}])+-"\'', $this->a) !== false)
{
echo $this->a;
$this->saveString();
break;
}
else
{
if (static::isAlphaNumeric($this->a))
{
echo $this->a;
$this->saveString();
}
}
break;
case ' ':
if (!static::isAlphaNumeric($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))
{
$this->saveRegex();
}
}
}
/**
* Resets attributes that do not need to be stored between requests so that
* the next request is ready to go. Another reason for this is to make sure
* the variables are cleared and are not taking up memory.
*
* @return void
*/
protected function clean()
{
unset($this->input);
$this->index = 0;
$this->a = $this->b = '';
unset($this->c);
unset($this->options);
}
/**
* Returns the next string for processing based off of the current index.
*
* @return string
*/
protected function getChar()
{
// Check to see if we had anything in the look ahead buffer and use that.
if (isset($this->c))
{
$char = $this->c;
unset($this->c);
// Otherwise we start pulling from the input.
}
else
{
$char = substr($this->input, $this->index, 1);
// If the next character doesn't exist return false.
if (isset($char) && $char === false)
{
return false;
}
// Otherwise increment the pointer and use this char.
$this->index++;
}
// Normalize all whitespace except for the newline character into a standard space.
if ($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.
*
* @throws \RuntimeException
*/
protected function getReal()
{
$startIndex = $this->index;
$char = $this->getChar();
// Check to see if we're potentially in a comment
if ($char !== '/')
{
return $char;
}
$this->c = $this->getChar();
if ($this->c == '/')
{
return $this->processOneLineComments($startIndex);
}
elseif ($this->c == '*')
{
return $this->processMultiLineComments($startIndex);
}
return $char;
}
/**
* Removed one line comments, with the exception of some very specific types of
* conditional comments.
*
* @param int $startIndex The index point where "getReal" function started
*
* @return string
*/
protected function processOneLineComments($startIndex)
{
$thirdCommentString = substr($this->input, $this->index, 1);
// Kill rest of line
$this->getNext("\n");
if ($thirdCommentString == '@')
{
$endPoint = ($this->index) - $startIndex;
unset($this->c);
$char = "\n" . substr($this->input, $startIndex, $endPoint);
}
else
{
// First one is contents of $this->c
$this->getChar();
$char = $this->getChar();
}
return $char;
}
/**
* Skips multiline comments where appropriate, and includes them where needed.
* Conditional comments and "license" style blocks are preserved.
*
* @param int $startIndex The index point where "getReal" function started
*
* @return bool|string False if there's no character#
*
* @throws \RuntimeException Unclosed comments will throw an error
*/
protected function processMultiLineComments($startIndex)
{
// Current C
$this->getChar();
$thirdCommentString = $this->getChar();
// Kill everything up to the next */ if it's there
if ($this->getNext('*/'))
{
// Get *
$this->getChar();
// Get /
$this->getChar();
// Get next real character
$char = $this->getChar();
// Now we reinsert conditional comments and YUI-style licensing comments
if (($this->options['flaggedComments'] && $thirdCommentString == '!')
|| ($thirdCommentString == '@'))
{
// If conditional comments or flagged comments are not the first thing in the script
// we need to echo a and fill it with a space before moving on.
if ($startIndex > 0)
{
echo $this->a;
$this->a = " ";
// If the comment started on a new line we let it stay on the new line
if ($this->input[($startIndex - 1)] == "\n")
{
echo "\n";
}
}
$endPoint = ($this->index - 1) - $startIndex;
echo substr($this->input, $startIndex, $endPoint);
return $char;
}
}
else
{
$char = false;
}
if ($char === false)
{
throw new \RuntimeException('Unclosed multiline comment at position: ' . ($this->index - 2));
}
// If we're here c is part of the comment and therefore tossed
if (isset($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 and the index is set
* to it's position.
*
* @param string $string - the string
*
* @return string|false Returns the first character of the string or false.
*/
protected function getNext($string)
{
// Find the next occurrence of "string" after the current position.
$pos = strpos($this->input, $string, $this->index);
// If it's not there return false.
if ($pos === false)
{
return false;
}
// Adjust position of index to jump ahead to the asked for string
$this->index = $pos;
// Return the first character of that string.
return substr($this->input, $this->index, 1);
}
/**
* When a javascript string is detected this function crawls for the end of
* it and saves the whole string.
*
* @throws \RuntimeException Unclosed strings will throw an error
*
* @return void
*/
protected function saveString()
{
$startpos = $this->index;
// SaveString is always called after a gets cleared, so we push b into that spot.
$this->a = $this->b;
// If this isn't a string we don't need to do anything.
if ($this->a != "'" && $this->a != '"')
{
return;
}
// String type is the quote used, " or '
$stringType = $this->a;
// Echo out that starting quote
echo $this->a;
// Loop until the string is done
while (1)
{
// Grab the very next character and load it into a
$this->a = $this->getChar();
switch ($this->a)
{
/**
* If the string opener (single or double quote) is used
* output it and break out of the while loop-
* The string is finished!
*/
case $stringType:
break 2;
/**
* 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;
}
}
}
/**
* When a regular expression is detected this function crawls for the end of
* it and saves the whole regex.
*
* @throws \RuntimeException Unclosed regex will throw an error
*
* @return void
*/
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();
}
/**
* Checks to see if a character is alphanumeric.
*
* @param string $char Just one character
*
* @return bool
*/
protected static function isAlphaNumeric($char)
{
return preg_match('/^[\w\$]$/', $char) === 1 || $char == '/';
}
/**
* Replace patterns in the given string and store the replacement
*
* @param string $js The string to lock
*
* @return bool
*/
protected function lock($js)
{
/* lock things like <code>"asd" + ++x;</code> */
$lock = '"LOCK---' . crc32(time()) . '"';
$matches = array();
preg_match('/([+-])(\s+)([+-])/', $js, $matches);
if (empty($matches))
{
return $js;
}
$this->locks[$lock] = $matches[2];
$js = preg_replace('/([+-])\s+([+-])/', "$1{$lock}$2", $js);
/* -- */
return $js;
}
/**
* Replace "locks" with the original characters
*
* @param string $js The string to unlock
*
* @return bool
*/
protected function unlock($js)
{
if (!count($this->locks))
{
return $js;
}
foreach ($this->locks as $lock => $replacement)
{
$js = str_replace($lock, $replacement, $js);
}
return $js;
}
}
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