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