<?php

/*!
 * cssmin.php rev ebaf67b 12/06/2013
 * Author: Tubal Martin - http://tubalmartin.me/
 * Repo: https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port
 *
 * This is a PHP port of the CSS minification tool distributed with YUICompressor, 
 * itself a port of the cssmin utility by Isaac Schlueter - http://foohack.com/
 * Permission is hereby granted to use the PHP version under the same
 * conditions as the YUICompressor.
 */

/*!
 * YUI Compressor
 * http://developer.yahoo.com/yui/compressor/
 * Author: Julien Lecomte - http://www.julienlecomte.net/
 * Copyright (c) 2013 Yahoo! Inc. All rights reserved.
 * The copyrights embodied in the content of this file are licensed
 * by Yahoo! Inc. under the BSD (revised) open source license.
 */

class CSSmin
{
 const NL = '___YUICSSMIN_PRESERVED_NL___';
 const TOKEN = '___YUICSSMIN_PRESERVED_TOKEN_';
 const COMMENT = '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_';
 const CLASSCOLON = '___YUICSSMIN_PSEUDOCLASSCOLON___';
 const QUERY_FRACTION = '___YUICSSMIN_QUERY_FRACTION___';

 private $comments;
 private $preserved_tokens;
 private $memory_limit;
 private $max_execution_time;
 private $pcre_backtrack_limit;
 private $pcre_recursion_limit;
 private $raise_php_limits;

 /**
 * @param bool|int $raise_php_limits
 * If true, PHP settings will be raised if needed
 */
 public function __construct($raise_php_limits = TRUE)
 {
 // Set suggested PHP limits
 $this->memory_limit = 128 * 1048576; // 128MB in bytes
 $this->max_execution_time = 60; // 1 min
 $this->pcre_backtrack_limit = 1000 * 1000;
 $this->pcre_recursion_limit = 500 * 1000;

 $this->raise_php_limits = (bool) $raise_php_limits;
 }

 /**
 * Minify a string of CSS
 * @param string $css
 * @param int|bool $linebreak_pos
 * @return string
 */
 public function run($css = '', $linebreak_pos = FALSE)
 {
 if (empty($css)) {
 return '';
 }

 if ($this->raise_php_limits) {
 $this->do_raise_php_limits();
 }

 $this->comments = array();
 $this->preserved_tokens = array();

 $start_index = 0;
 $length = strlen($css);

 $css = $this->extract_data_urls($css);

 // collect all comment blocks...
 while (($start_index = $this->index_of($css, '/*', $start_index)) >= 0) {
 $end_index = $this->index_of($css, '*/', $start_index + 2);
 if ($end_index < 0) {
 $end_index = $length;
 }
 $comment_found = $this->str_slice($css, $start_index + 2, $end_index);
 $this->comments[] = $comment_found;
 $comment_preserve_string = self::COMMENT . (count($this->comments) - 1) . '___';
 $css = $this->str_slice($css, 0, $start_index + 2) . $comment_preserve_string . $this->str_slice($css, $end_index);
 // Set correct start_index: Fixes issue #2528130
 $start_index = $end_index + 2 + strlen($comment_preserve_string) - strlen($comment_found);
 }

 // preserve strings so their content doesn't get accidentally minified
 $css = preg_replace_callback('/(?:"(?:[^\\\\"]|\\\\.|\\\\)*")|'."(?:'(?:[^\\\\']|\\\\.|\\\\)*')/S", array($this, 'replace_string'), $css);

 // Let's divide css code in chunks of 25.000 chars aprox.
 // Reason: PHP's PCRE functions like preg_replace have a "backtrack limit"
 // of 100.000 chars by default (php < 5.3.7) so if we're dealing with really
 // long strings and a (sub)pattern matches a number of chars greater than
 // the backtrack limit number (i.e. /(.*)/s) PCRE functions may fail silently
 // returning NULL and $css would be empty.
 $charset = '';
 $charset_regexp = '/(@charset)( [^;]+;)/i';
 $css_chunks = array();
 $css_chunk_length = 25000; // aprox size, not exact
 $start_index = 0;
 $i = $css_chunk_length; // save initial iterations
 $l = strlen($css);


 // if the number of characters is 25000 or less, do not chunk
 if ($l <= $css_chunk_length) {
 $css_chunks[] = $css;
 } else {
 // chunk css code securely
 while ($i < $l) {
 $i += 50; // save iterations. 500 checks for a closing curly brace }
 if ($l - $start_index <= $css_chunk_length || $i >= $l) {
 $css_chunks[] = $this->str_slice($css, $start_index);
 break;
 }
 if ($css[$i - 1] === '}' && $i - $start_index > $css_chunk_length) {
 // If there are two ending curly braces }} separated or not by spaces,
 // join them in the same chunk (i.e. @media blocks)
 $next_chunk = substr($css, $i);
 if (preg_match('/^\s*\}/', $next_chunk)) {
 $i = $i + $this->index_of($next_chunk, '}') + 1;
 }

 $css_chunks[] = $this->str_slice($css, $start_index, $i);
 $start_index = $i;
 }
 }
 }

 // Minify each chunk
 for ($i = 0, $n = count($css_chunks); $i < $n; $i++) {
 $css_chunks[$i] = $this->minify($css_chunks[$i], $linebreak_pos);
 // Keep the first @charset at-rule found
 if (empty($charset) && preg_match($charset_regexp, $css_chunks[$i], $matches)) {
 $charset = strtolower($matches[1]) . $matches[2];
 }
 // Delete all @charset at-rules
 $css_chunks[$i] = preg_replace($charset_regexp, '', $css_chunks[$i]);
 }

 // Update the first chunk and push the charset to the top of the file.
 $css_chunks[0] = $charset . $css_chunks[0];

 return implode('', $css_chunks);
 }

 /**
 * Sets the memory limit for this script
 * @param int|string $limit
 */
 public function set_memory_limit($limit)
 {
 $this->memory_limit = $this->normalize_int($limit);
 }

 /**
 * Sets the maximum execution time for this script
 * @param int|string $seconds
 */
 public function set_max_execution_time($seconds)
 {
 $this->max_execution_time = (int) $seconds;
 }

 /**
 * Sets the PCRE backtrack limit for this script
 * @param int $limit
 */
 public function set_pcre_backtrack_limit($limit)
 {
 $this->pcre_backtrack_limit = (int) $limit;
 }

 /**
 * Sets the PCRE recursion limit for this script
 * @param int $limit
 */
 public function set_pcre_recursion_limit($limit)
 {
 $this->pcre_recursion_limit = (int) $limit;
 }

 /**
 * Try to configure PHP to use at least the suggested minimum settings
 */
 private function do_raise_php_limits()
 {
 $php_limits = array(
 'memory_limit' => $this->memory_limit,
 'max_execution_time' => $this->max_execution_time,
 'pcre.backtrack_limit' => $this->pcre_backtrack_limit,
 'pcre.recursion_limit' => $this->pcre_recursion_limit
 );

 // If current settings are higher respect them.
 foreach ($php_limits as $name => $suggested) {
 $current = $this->normalize_int(ini_get($name));
 // memory_limit exception: allow -1 for "no memory limit".
 if ($current > -1 && ($suggested == -1 || $current < $suggested)) {
 ini_set($name, $suggested);
 }
 }
 }

 /**
 * Does bulk of the minification
 * @param string $css
 * @param int|bool $linebreak_pos
 * @return string
 */
 private function minify($css, $linebreak_pos)
 {
 // strings are safe, now wrestle the comments
 for ($i = 0, $max = count($this->comments); $i < $max; $i++) {

 $token = $this->comments[$i];
 $placeholder = '/' . self::COMMENT . $i . '___/';

 // ! in the first position of the comment means preserve
 // so push to the preserved tokens keeping the !
 if (substr($token, 0, 1) === '!') {
 $this->preserved_tokens[] = $token;
 $token_tring = self::TOKEN . (count($this->preserved_tokens) - 1) . '___';
 $css = preg_replace($placeholder, $token_tring, $css, 1);
 // Preserve new lines for /*! important comments
 $css = preg_replace('/\s*[\n\r\f]+\s*(\/\*'. $token_tring .')/S', self::NL.'1ドル', $css);
 $css = preg_replace('/('. $token_tring .'\*\/)\s*[\n\r\f]+\s*/', '1ドル'.self::NL, $css);
 continue;
 }

 // \ in the last position looks like hack for Mac/IE5
 // shorten that to /*\*/ and the next one to /**/
 if (substr($token, (strlen($token) - 1), 1) === '\\') {
 $this->preserved_tokens[] = '\\';
 $css = preg_replace($placeholder, self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
 $i = $i + 1; // attn: advancing the loop
 $this->preserved_tokens[] = '';
 $css = preg_replace('/' . self::COMMENT . $i . '___/', self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
 continue;
 }

 // keep empty comments after child selectors (IE7 hack)
 // e.g. html >/**/ body
 if (strlen($token) === 0) {
 $start_index = $this->index_of($css, $this->str_slice($placeholder, 1, -1));
 if ($start_index > 2) {
 if (substr($css, $start_index - 3, 1) === '>') {
 $this->preserved_tokens[] = '';
 $css = preg_replace($placeholder, self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
 }
 }
 }

 // in all other cases kill the comment
 $css = preg_replace('/\/\*' . $this->str_slice($placeholder, 1, -1) . '\*\//', '', $css, 1);
 }


 // Normalize all whitespace strings to single spaces. Easier to work with that way.
 $css = preg_replace('/\s+/', ' ', $css);

 // Shorten & preserve calculations calc(...) since spaces are important
 $css = preg_replace_callback('/calc(\(((?:[^\(\)]+|(?1))*)\))/i', array($this, 'replace_calc'), $css);

 // Replace positive sign from numbers preceded by : or a white-space before the leading space is removed
 // +1.2em to 1.2em, +.8px to .8px, +2% to 2%
 $css = preg_replace('/((?<!\\\\)\:|\s)\+(\.?\d+)/S', '1ドル2ドル', $css);

 // Remove leading zeros from integer and float numbers preceded by : or a white-space
 // 000.6 to .6, -0.8 to -.8, 0050 to 50, -01.05 to -1.05
 $css = preg_replace('/((?<!\\\\)\:|\s)(\-?)0+(\.?\d+)/S', '1ドル2ドル3ドル', $css);

 // Remove trailing zeros from float numbers preceded by : or a white-space
 // -6.0100em to -6.01em, .0100 to .01, 1.200px to 1.2px
 $css = preg_replace('/((?<!\\\\)\:|\s)(\-?)(\d?\.\d+?)0+([^\d])/S', '1ドル2ドル3ドル4ドル', $css);

 // Remove trailing .0 -> -9.0 to -9
 $css = preg_replace('/((?<!\\\\)\:|\s)(\-?\d+)\.0([^\d])/S', '1ドル2ドル3ドル', $css);

 // Replace 0 length numbers with 0
 $css = preg_replace('/((?<!\\\\)\:|\s)\-?\.?0+([^\d])/S', '${1}02ドル', $css);

 // Remove the spaces before the things that should not have spaces before them.
 // But, be careful not to turn "p :link {...}" into "p:link{...}"
 // Swap out any pseudo-class colons with the token, and then swap back.
 $css = preg_replace_callback('/(?:^|\})(?:(?:[^\{\:])+\:)+(?:[^\{]*\{)/', array($this, 'replace_colon'), $css);
 
 // Remove spaces before the things that should not have spaces before them.
 $css = preg_replace('/\s+([\!\{\}\;\:\>\+\(\)\]\~\=,])/', '1ドル', $css);

 // Restore spaces for !important
 $css = preg_replace('/\!important/i', ' !important', $css);

 // bring back the colon
 $css = preg_replace('/' . self::CLASSCOLON . '/', ':', $css);

 // retain space for special IE6 cases
 $css = preg_replace_callback('/\:first\-(line|letter)(\{|,)/i', array($this, 'lowercase_pseudo_first'), $css);

 // no space after the end of a preserved comment
 $css = preg_replace('/\*\/ /', '*/', $css);

 // lowercase some popular @directives
 $css = preg_replace_callback('/@(font-face|import|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?keyframe|media|page|namespace)/i', array($this, 'lowercase_directives'), $css);

 // lowercase some more common pseudo-elements
 $css = preg_replace_callback('/:(active|after|before|checked|disabled|empty|enabled|first-(?:child|of-type)|focus|hover|last-(?:child|of-type)|link|only-(?:child|of-type)|root|:selection|target|visited)/i', array($this, 'lowercase_pseudo_elements'), $css);

 // lowercase some more common functions
 $css = preg_replace_callback('/:(lang|not|nth-child|nth-last-child|nth-last-of-type|nth-of-type|(?:-(?:moz|webkit)-)?any)\(/i', array($this, 'lowercase_common_functions'), $css);

 // lower case some common function that can be values
 // NOTE: rgb() isn't useful as we replace with #hex later, as well as and() is already done for us
 $css = preg_replace_callback('/([:,\( ]\s*)(attr|color-stop|from|rgba|to|url|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?(?:calc|max|min|(?:repeating-)?(?:linear|radial)-gradient)|-webkit-gradient)/iS', array($this, 'lowercase_common_functions_values'), $css);
 
 // Put the space back in some cases, to support stuff like
 // @media screen and (-webkit-min-device-pixel-ratio:0){
 $css = preg_replace('/\band\(/i', 'and (', $css);

 // Remove the spaces after the things that should not have spaces after them.
 $css = preg_replace('/([\!\{\}\:;\>\+\(\[\~\=,])\s+/S', '1ドル', $css);

 // remove unnecessary semicolons
 $css = preg_replace('/;+\}/', '}', $css);

 // Fix for issue: #2528146
 // Restore semicolon if the last property is prefixed with a `*` (lte IE7 hack)
 // to avoid issues on Symbian S60 3.x browsers.
 $css = preg_replace('/(\*[a-z0-9\-]+\s*\:[^;\}]+)(\})/', '1ドル;2ドル', $css);

 // Replace 0 length units 0(px,em,%) with 0.
 $css = preg_replace('/(^|[^0-9])(?:0?\.)?0(?:em|ex|ch|rem|vw|vh|vm|vmin|cm|mm|in|px|pt|pc|%|deg|g?rad|m?s|k?hz)/iS', '${1}0', $css);

 // Replace 0 0; or 0 0 0; or 0 0 0 0; with 0.
 $css = preg_replace('/\:0(?: 0){1,3}(;|\}| \!)/', ':01ドル', $css);

 // Fix for issue: #2528142
 // Replace text-shadow:0; with text-shadow:0 0 0;
 $css = preg_replace('/(text-shadow\:0)(;|\}| \!)/i', '1ドル 0 02ドル', $css);

 // Replace background-position:0; with background-position:0 0;
 // same for transform-origin
 // Changing -webkit-mask-position: 0 0 to just a single 0 will result in the second parameter defaulting to 50% (center)
 $css = preg_replace('/(background\-position|webkit-mask-position|(?:webkit|moz|o|ms|)\-?transform\-origin)\:0(;|\}| \!)/iS', '1ドル:0 02ドル', $css);

 // Shorten colors from rgb(51,102,153) to #336699, rgb(100%,0%,0%) to #ff0000 (sRGB color space)
 // Shorten colors from hsl(0, 100%, 50%) to #ff0000 (sRGB color space)
 // This makes it more likely that it'll get further compressed in the next step.
 $css = preg_replace_callback('/rgb\s*\(\s*([0-9,\s\-\.\%]+)\s*\)(.{1})/i', array($this, 'rgb_to_hex'), $css);
 $css = preg_replace_callback('/hsl\s*\(\s*([0-9,\s\-\.\%]+)\s*\)(.{1})/i', array($this, 'hsl_to_hex'), $css);

 // Shorten colors from #AABBCC to #ABC or short color name.
 $css = $this->compress_hex_colors($css);

 // border: none to border:0, outline: none to outline:0
 $css = preg_replace('/(border\-?(?:top|right|bottom|left|)|outline)\:none(;|\}| \!)/iS', '1ドル:02ドル', $css);

 // shorter opacity IE filter
 $css = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $css);

 // Find a fraction that is used for Opera's -o-device-pixel-ratio query
 // Add token to add the "\" back in later
 $css = preg_replace('/\(([a-z\-]+):([0-9]+)\/([0-9]+)\)/i', '(1ドル:2ドル'. self::QUERY_FRACTION .'3ドル)', $css);

 // Remove empty rules.
 $css = preg_replace('/[^\};\{\/]+\{\}/S', '', $css);

 // Add "/" back to fix Opera -o-device-pixel-ratio query
 $css = preg_replace('/'. self::QUERY_FRACTION .'/', '/', $css);

 // Some source control tools don't like it when files containing lines longer
 // than, say 8000 characters, are checked in. The linebreak option is used in
 // that case to split long lines after a specific column.
 if ($linebreak_pos !== FALSE && (int) $linebreak_pos >= 0) {
 $linebreak_pos = (int) $linebreak_pos;
 $start_index = $i = 0;
 while ($i < strlen($css)) {
 $i++;
 if ($css[$i - 1] === '}' && $i - $start_index > $linebreak_pos) {
 $css = $this->str_slice($css, 0, $i) . "\n" . $this->str_slice($css, $i);
 $start_index = $i;
 }
 }
 }

 // Replace multiple semi-colons in a row by a single one
 // See SF bug #1980989
 $css = preg_replace('/;;+/', ';', $css);

 // Restore new lines for /*! important comments
 $css = preg_replace('/'. self::NL .'/', "\n", $css);

 // Lowercase all uppercase properties
 $css = preg_replace_callback('/(\{|\;)([A-Z\-]+)(\:)/', array($this, 'lowercase_properties'), $css);

 // restore preserved comments and strings
 for ($i = 0, $max = count($this->preserved_tokens); $i < $max; $i++) {
 $css = preg_replace('/' . self::TOKEN . $i . '___/', $this->preserved_tokens[$i], $css, 1);
 }

 // Trim the final string (for any leading or trailing white spaces)
 return trim($css);
 }

 /**
 * Utility method to replace all data urls with tokens before we start
 * compressing, to avoid performance issues running some of the subsequent
 * regexes against large strings chunks.
 *
 * @param string $css
 * @return string
 */
 private function extract_data_urls($css)
 {
 // Leave data urls alone to increase parse performance.
 $max_index = strlen($css) - 1;
 $append_index = $index = $last_index = $offset = 0;
 $sb = array();
 $pattern = '/url\(\s*(["\']?)data\:/i';

 // Since we need to account for non-base64 data urls, we need to handle
 // ' and ) being part of the data string. Hence switching to indexOf,
 // to determine whether or not we have matching string terminators and
 // handling sb appends directly, instead of using matcher.append* methods.

 while (preg_match($pattern, $css, $m, 0, $offset)) {
 $index = $this->index_of($css, $m[0], $offset);
 $last_index = $index + strlen($m[0]);
 $start_index = $index + 4; // "url(".length()
 $end_index = $last_index - 1;
 $terminator = $m[1]; // ', " or empty (not quoted)
 $found_terminator = FALSE;

 if (strlen($terminator) === 0) {
 $terminator = ')';
 }

 while ($found_terminator === FALSE && $end_index+1 <= $max_index) {
 $end_index = $this->index_of($css, $terminator, $end_index + 1);

 // endIndex == 0 doesn't really apply here
 if ($end_index > 0 && substr($css, $end_index - 1, 1) !== '\\') {
 $found_terminator = TRUE;
 if (')' != $terminator) {
 $end_index = $this->index_of($css, ')', $end_index);
 }
 }
 }

 // Enough searching, start moving stuff over to the buffer
 $sb[] = $this->str_slice($css, $append_index, $index);

 if ($found_terminator) {
 $token = $this->str_slice($css, $start_index, $end_index);
 $token = preg_replace('/\s+/', '', $token);
 $this->preserved_tokens[] = $token;

 $preserver = 'url(' . self::TOKEN . (count($this->preserved_tokens) - 1) . '___)';
 $sb[] = $preserver;

 $append_index = $end_index + 1;
 } else {
 // No end terminator found, re-add the whole match. Should we throw/warn here?
 $sb[] = $this->str_slice($css, $index, $last_index);
 $append_index = $last_index;
 }

 $offset = $last_index;
 }

 $sb[] = $this->str_slice($css, $append_index);

 return implode('', $sb);
 }

 /**
 * Utility method to compress hex color values of the form #AABBCC to #ABC or short color name.
 *
 * DOES NOT compress CSS ID selectors which match the above pattern (which would break things).
 * e.g. #AddressForm { ... }
 *
 * DOES NOT compress IE filters, which have hex color values (which would break things).
 * e.g. filter: chroma(color="#FFFFFF");
 *
 * DOES NOT compress invalid hex values.
 * e.g. background-color: #aabbccdd
 *
 * @param string $css
 * @return string
 */
 private function compress_hex_colors($css)
 {
 // Look for hex colors inside { ... } (to avoid IDs) and which don't have a =, or a " in front of them (to avoid filters)
 $pattern = '/(\=\s*?["\']?)?#([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])(\}|[^0-9a-f{][^{]*?\})/iS';
 $_index = $index = $last_index = $offset = 0;
 $sb = array();
 // See: http://ajaxmin.codeplex.com/wikipage?title=CSS%20Colors
 $short_safe = array(
 '#808080' => 'gray',
 '#008000' => 'green',
 '#800000' => 'maroon',
 '#000080' => 'navy',
 '#808000' => 'olive',
 '#ffa500' => 'orange',
 '#800080' => 'purple',
 '#c0c0c0' => 'silver',
 '#008080' => 'teal',
 '#f00' => 'red'
 );

 while (preg_match($pattern, $css, $m, 0, $offset)) {
 $index = $this->index_of($css, $m[0], $offset);
 $last_index = $index + strlen($m[0]);
 $is_filter = $m[1] !== null && $m[1] !== '';

 $sb[] = $this->str_slice($css, $_index, $index);

 if ($is_filter) {
 // Restore, maintain case, otherwise filter will break
 $sb[] = $m[1] . '#' . $m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7];
 } else {
 if (strtolower($m[2]) == strtolower($m[3]) &&
 strtolower($m[4]) == strtolower($m[5]) &&
 strtolower($m[6]) == strtolower($m[7])) {
 // Compress.
 $hex = '#' . strtolower($m[3] . $m[5] . $m[7]);
 } else {
 // Non compressible color, restore but lower case.
 $hex = '#' . strtolower($m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]);
 }
 // replace Hex colors to short safe color names
 $sb[] = array_key_exists($hex, $short_safe) ? $short_safe[$hex] : $hex;
 }

 $_index = $offset = $last_index - strlen($m[8]);
 }

 $sb[] = $this->str_slice($css, $_index);

 return implode('', $sb);
 }

 /* CALLBACKS
 * ---------------------------------------------------------------------------------------------
 */

 private function replace_string($matches)
 {
 $match = $matches[0];
 $quote = substr($match, 0, 1);
 // Must use addcslashes in PHP to avoid parsing of backslashes
 $match = addcslashes($this->str_slice($match, 1, -1), '\\');

 // maybe the string contains a comment-like substring?
 // one, maybe more? put'em back then
 if (($pos = $this->index_of($match, self::COMMENT)) >= 0) {
 for ($i = 0, $max = count($this->comments); $i < $max; $i++) {
 $match = preg_replace('/' . self::COMMENT . $i . '___/', $this->comments[$i], $match, 1);
 }
 }

 // minify alpha opacity in filter strings
 $match = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $match);

 $this->preserved_tokens[] = $match;
 return $quote . self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . $quote;
 }

 private function replace_colon($matches)
 {
 return preg_replace('/\:/', self::CLASSCOLON, $matches[0]);
 }

 private function replace_calc($matches)
 {
 $this->preserved_tokens[] = trim(preg_replace('/\s*([\*\/\(\),])\s*/', '1ドル', $matches[2]));
 return 'calc('. self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . ')';
 }

 private function rgb_to_hex($matches)
 {
 // Support for percentage values rgb(100%, 0%, 45%);
 if ($this->index_of($matches[1], '%') >= 0){
 $rgbcolors = explode(',', str_replace('%', '', $matches[1]));
 for ($i = 0; $i < count($rgbcolors); $i++) {
 $rgbcolors[$i] = $this->round_number(floatval($rgbcolors[$i]) * 2.55);
 }
 } else {
 $rgbcolors = explode(',', $matches[1]);
 }

 // Values outside the sRGB color space should be clipped (0-255)
 for ($i = 0; $i < count($rgbcolors); $i++) {
 $rgbcolors[$i] = $this->clamp_number(intval($rgbcolors[$i], 10), 0, 255);
 $rgbcolors[$i] = sprintf("%02x", $rgbcolors[$i]);
 }

 // Fix for issue #2528093
 if (!preg_match('/[\s,円\);\}]/', $matches[2])){
 $matches[2] = ' ' . $matches[2];
 }

 return '#' . implode('', $rgbcolors) . $matches[2];
 }

 private function hsl_to_hex($matches)
 {
 $values = explode(',', str_replace('%', '', $matches[1]));
 $h = floatval($values[0]);
 $s = floatval($values[1]);
 $l = floatval($values[2]);

 // Wrap and clamp, then fraction!
 $h = ((($h % 360) + 360) % 360) / 360;
 $s = $this->clamp_number($s, 0, 100) / 100;
 $l = $this->clamp_number($l, 0, 100) / 100;

 if ($s == 0) {
 $r = $g = $b = $this->round_number(255 * $l);
 } else {
 $v2 = $l < 0.5 ? $l * (1 + $s) : ($l + $s) - ($s * $l);
 $v1 = (2 * $l) - $v2;
 $r = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h + (1/3)));
 $g = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h));
 $b = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h - (1/3)));
 }

 return $this->rgb_to_hex(array('', $r.','.$g.','.$b, $matches[2]));
 }

 private function lowercase_pseudo_first($matches)
 {
 return ':first-'. strtolower($matches[1]) .' '. $matches[2];
 }

 private function lowercase_directives($matches) 
 {
 return '@'. strtolower($matches[1]);
 }

 private function lowercase_pseudo_elements($matches) 
 {
 return ':'. strtolower($matches[1]);
 }

 private function lowercase_common_functions($matches) 
 {
 return ':'. strtolower($matches[1]) .'(';
 }

 private function lowercase_common_functions_values($matches) 
 {
 return $matches[1] . strtolower($matches[2]);
 }

 private function lowercase_properties($matches)
 {
 return $matches[1].strtolower($matches[2]).$matches[3];
 }

 /* HELPERS
 * ---------------------------------------------------------------------------------------------
 */

 private function hue_to_rgb($v1, $v2, $vh)
 {
 $vh = $vh < 0 ? $vh + 1 : ($vh > 1 ? $vh - 1 : $vh);
 if ($vh * 6 < 1) return $v1 + ($v2 - $v1) * 6 * $vh;
 if ($vh * 2 < 1) return $v2;
 if ($vh * 3 < 2) return $v1 + ($v2 - $v1) * ((2/3) - $vh) * 6;
 return $v1;
 }

 private function round_number($n)
 {
 return intval(floor(floatval($n) + 0.5), 10);
 }

 private function clamp_number($n, $min, $max)
 {
 return min(max($n, $min), $max);
 }

 /**
 * PHP port of Javascript's "indexOf" function for strings only
 * Author: Tubal Martin http://blog.margenn.com
 *
 * @param string $haystack
 * @param string $needle
 * @param int $offset index (optional)
 * @return int
 */
 private function index_of($haystack, $needle, $offset = 0)
 {
 $index = strpos($haystack, $needle, $offset);

 return ($index !== FALSE) ? $index : -1;
 }

 /**
 * PHP port of Javascript's "slice" function for strings only
 * Author: Tubal Martin http://blog.margenn.com
 * Tests: http://margenn.com/tubal/str_slice/
 *
 * @param string $str
 * @param int $start index
 * @param int|bool $end index (optional)
 * @return string
 */
 private function str_slice($str, $start = 0, $end = FALSE)
 {
 if ($end !== FALSE && ($start < 0 || $end <= 0)) {
 $max = strlen($str);

 if ($start < 0) {
 if (($start = $max + $start) < 0) {
 return '';
 }
 }

 if ($end < 0) {
 if (($end = $max + $end) < 0) {
 return '';
 }
 }

 if ($end <= $start) {
 return '';
 }
 }

 $slice = ($end === FALSE) ? substr($str, $start) : substr($str, $start, $end - $start);
 return ($slice === FALSE) ? '' : $slice;
 }

 /**
 * Convert strings like "64M" or "30" to int values
 * @param mixed $size
 * @return int
 */
 private function normalize_int($size)
 {
 if (is_string($size)) {
 switch (substr($size, -1)) {
 case 'M': case 'm': return $size * 1048576;
 case 'K': case 'k': return $size * 1024;
 case 'G': case 'g': return $size * 1073741824;
 }
 }

 return (int) $size;
 }
}