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<?php |
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|
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/*! |
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* cssmin.php v2.4.8-4 |
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* Author: Tubal Martin - http://tubalmartin.me/ |
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* Repo: https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port |
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* |
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* This is a PHP port of the CSS minification tool distributed with YUICompressor, |
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* itself a port of the cssmin utility by Isaac Schlueter - http://foohack.com/ |
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* Permission is hereby granted to use the PHP version under the same |
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* conditions as the YUICompressor. |
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*/ |
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|
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/*! |
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* YUI Compressor |
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* http://developer.yahoo.com/yui/compressor/ |
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* Author: Julien Lecomte - http://www.julienlecomte.net/ |
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* Copyright (c) 2013 Yahoo! Inc. All rights reserved. |
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* The copyrights embodied in the content of this file are licensed |
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* by Yahoo! Inc. under the BSD (revised) open source license. |
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*/ |
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|
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class CSSmin |
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{ |
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const NL = '___YUICSSMIN_PRESERVED_NL___'; |
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const TOKEN = '___YUICSSMIN_PRESERVED_TOKEN_'; |
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const COMMENT = '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_'; |
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const CLASSCOLON = '___YUICSSMIN_PSEUDOCLASSCOLON___'; |
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const QUERY_FRACTION = '___YUICSSMIN_QUERY_FRACTION___'; |
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|
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private $comments; |
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private $preserved_tokens; |
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private $memory_limit; |
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private $max_execution_time; |
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private $pcre_backtrack_limit; |
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private $pcre_recursion_limit; |
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private $raise_php_limits; |
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|
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/** |
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* @param bool|int $raise_php_limits |
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* If true, PHP settings will be raised if needed |
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*/ |
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public function __construct($raise_php_limits = TRUE) |
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{ |
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// Set suggested PHP limits |
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$this->memory_limit = 128 * 1048576; // 128MB in bytes |
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$this->max_execution_time = 60; // 1 min |
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$this->pcre_backtrack_limit = 1000 * 1000; |
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$this->pcre_recursion_limit = 500 * 1000; |
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|
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$this->raise_php_limits = (bool) $raise_php_limits; |
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} |
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|
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/** |
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* Minify a string of CSS |
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* @param string $css |
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* @param int|bool $linebreak_pos |
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* @return string |
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*/ |
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public function run($css = '', $linebreak_pos = FALSE) |
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{ |
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if (empty($css)) { |
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return ''; |
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} |
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|
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if ($this->raise_php_limits) { |
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$this->do_raise_php_limits(); |
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} |
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|
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$this->comments = array(); |
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$this->preserved_tokens = array(); |
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|
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$start_index = 0; |
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$length = strlen($css); |
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|
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$css = $this->extract_data_urls($css); |
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|
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// collect all comment blocks... |
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while (($start_index = $this->index_of($css, '/*', $start_index)) >= 0) { |
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$end_index = $this->index_of($css, '*/', $start_index + 2); |
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if ($end_index < 0) { |
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$end_index = $length; |
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} |
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$comment_found = $this->str_slice($css, $start_index + 2, $end_index); |
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$this->comments[] = $comment_found; |
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$comment_preserve_string = self::COMMENT . (count($this->comments) - 1) . '___'; |
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$css = $this->str_slice($css, 0, $start_index + 2) . $comment_preserve_string . $this->str_slice($css, $end_index); |
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// Set correct start_index: Fixes issue #2528130 |
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$start_index = $end_index + 2 + strlen($comment_preserve_string) - strlen($comment_found); |
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} |
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|
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// preserve strings so their content doesn't get accidentally minified |
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$css = preg_replace_callback('/(?:"(?:[^\\\\"]|\\\\.|\\\\)*")|'."(?:'(?:[^\\\\']|\\\\.|\\\\)*')/S", array($this, 'replace_string'), $css); |
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|
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// Let's divide css code in chunks of 5.000 chars aprox. |
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// Reason: PHP's PCRE functions like preg_replace have a "backtrack limit" |
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// of 100.000 chars by default (php < 5.3.7) so if we're dealing with really |
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// long strings and a (sub)pattern matches a number of chars greater than |
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// the backtrack limit number (i.e. /(.*)/s) PCRE functions may fail silently |
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// returning NULL and $css would be empty. |
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$charset = ''; |
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$charset_regexp = '/(@charset)( [^;]+;)/i'; |
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$css_chunks = array(); |
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$css_chunk_length = 5000; // aprox size, not exact |
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$start_index = 0; |
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$i = $css_chunk_length; // save initial iterations |
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$l = strlen($css); |
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|
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|
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// if the number of characters is 5000 or less, do not chunk |
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if ($l <= $css_chunk_length) { |
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$css_chunks[] = $css; |
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} else { |
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// chunk css code securely |
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while ($i < $l) { |
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$i += 50; // save iterations |
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if ($l - $start_index <= $css_chunk_length || $i >= $l) { |
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$css_chunks[] = $this->str_slice($css, $start_index); |
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break; |
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} |
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if ($css[$i - 1] === '}' && $i - $start_index > $css_chunk_length) { |
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// If there are two ending curly braces }} separated or not by spaces, |
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// join them in the same chunk (i.e. @media blocks) |
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$next_chunk = substr($css, $i); |
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if (preg_match('/^\s*\}/', $next_chunk)) { |
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$i = $i + $this->index_of($next_chunk, '}') + 1; |
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} |
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|
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$css_chunks[] = $this->str_slice($css, $start_index, $i); |
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$start_index = $i; |
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} |
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} |
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} |
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|
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// Minify each chunk |
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for ($i = 0, $n = count($css_chunks); $i < $n; $i++) { |
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$css_chunks[$i] = $this->minify($css_chunks[$i], $linebreak_pos); |
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// Keep the first @charset at-rule found |
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if (empty($charset) && preg_match($charset_regexp, $css_chunks[$i], $matches)) { |
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$charset = strtolower($matches[1]) . $matches[2]; |
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} |
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// Delete all @charset at-rules |
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$css_chunks[$i] = preg_replace($charset_regexp, '', $css_chunks[$i]); |
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} |
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|
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// Update the first chunk and push the charset to the top of the file. |
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$css_chunks[0] = $charset . $css_chunks[0]; |
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|
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return implode('', $css_chunks); |
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} |
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|
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/** |
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* Sets the memory limit for this script |
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* @param int|string $limit |
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*/ |
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public function set_memory_limit($limit) |
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{ |
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$this->memory_limit = $this->normalize_int($limit); |
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} |
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|
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/** |
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* Sets the maximum execution time for this script |
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* @param int|string $seconds |
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*/ |
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public function set_max_execution_time($seconds) |
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{ |
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$this->max_execution_time = (int) $seconds; |
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} |
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|
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/** |
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* Sets the PCRE backtrack limit for this script |
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* @param int $limit |
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*/ |
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public function set_pcre_backtrack_limit($limit) |
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{ |
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$this->pcre_backtrack_limit = (int) $limit; |
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} |
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|
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/** |
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* Sets the PCRE recursion limit for this script |
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* @param int $limit |
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*/ |
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public function set_pcre_recursion_limit($limit) |
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{ |
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$this->pcre_recursion_limit = (int) $limit; |
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} |
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|
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/** |
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* Try to configure PHP to use at least the suggested minimum settings |
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*/ |
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private function do_raise_php_limits() |
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{ |
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$php_limits = array( |
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'memory_limit' => $this->memory_limit, |
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'max_execution_time' => $this->max_execution_time, |
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'pcre.backtrack_limit' => $this->pcre_backtrack_limit, |
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'pcre.recursion_limit' => $this->pcre_recursion_limit |
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); |
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|
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// If current settings are higher respect them. |
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foreach ($php_limits as $name => $suggested) { |
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$current = $this->normalize_int(ini_get($name)); |
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// memory_limit exception: allow -1 for "no memory limit". |
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if ($current > -1 && ($suggested == -1 || $current < $suggested)) { |
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ini_set($name, $suggested); |
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} |
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} |
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} |
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|
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/** |
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* Does bulk of the minification |
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* @param string $css |
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* @param int|bool $linebreak_pos |
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* @return string |
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*/ |
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private function minify($css, $linebreak_pos) |
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{ |
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// strings are safe, now wrestle the comments |
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for ($i = 0, $max = count($this->comments); $i < $max; $i++) { |
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|
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$token = $this->comments[$i]; |
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$placeholder = '/' . self::COMMENT . $i . '___/'; |
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|
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// ! in the first position of the comment means preserve |
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// so push to the preserved tokens keeping the ! |
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if (substr($token, 0, 1) === '!') { |
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$this->preserved_tokens[] = $token; |
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$token_tring = self::TOKEN . (count($this->preserved_tokens) - 1) . '___'; |
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$css = preg_replace($placeholder, $token_tring, $css, 1); |
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// Preserve new lines for /*! important comments |
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$css = preg_replace('/\s*[\n\r\f]+\s*(\/\*'. $token_tring .')/S', self::NL.'$1', $css); |
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$css = preg_replace('/('. $token_tring .'\*\/)\s*[\n\r\f]+\s*/', '$1'.self::NL, $css); |
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continue; |
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} |
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|
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// \ in the last position looks like hack for Mac/IE5 |
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// shorten that to /*\*/ and the next one to /**/ |
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if (substr($token, (strlen($token) - 1), 1) === '\\') { |
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$this->preserved_tokens[] = '\\'; |
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$css = preg_replace($placeholder, self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1); |
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$i = $i + 1; // attn: advancing the loop |
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$this->preserved_tokens[] = ''; |
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$css = preg_replace('/' . self::COMMENT . $i . '___/', self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1); |
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continue; |
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} |
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|
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// keep empty comments after child selectors (IE7 hack) |
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// e.g. html >/**/ body |
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if (strlen($token) === 0) { |
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$start_index = $this->index_of($css, $this->str_slice($placeholder, 1, -1)); |
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if ($start_index > 2) { |
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if (substr($css, $start_index - 3, 1) === '>') { |
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$this->preserved_tokens[] = ''; |
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$css = preg_replace($placeholder, self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1); |
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} |
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} |
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} |
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|
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// in all other cases kill the comment |
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$css = preg_replace('/\/\*' . $this->str_slice($placeholder, 1, -1) . '\*\//', '', $css, 1); |
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} |
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|
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|
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// Normalize all whitespace strings to single spaces. Easier to work with that way. |
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$css = preg_replace('/\s+/', ' ', $css); |
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|
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// Fix IE7 issue on matrix filters which browser accept whitespaces between Matrix parameters |
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$css = preg_replace_callback('/\s*filter\:\s*progid:DXImageTransform\.Microsoft\.Matrix\(([^\)]+)\)/', array($this, 'preserve_old_IE_specific_matrix_definition'), $css); |
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|
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// Shorten & preserve calculations calc(...) since spaces are important |
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$css = preg_replace_callback('/calc(\(((?:[^\(\)]+|(?1))*)\))/i', array($this, 'replace_calc'), $css); |
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|
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// Replace positive sign from numbers preceded by : or a white-space before the leading space is removed |
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// +1.2em to 1.2em, +.8px to .8px, +2% to 2% |
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$css = preg_replace('/((?<!\\\\)\:|\s)\+(\.?\d+)/S', '$1$2', $css); |
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|
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// Remove leading zeros from integer and float numbers preceded by : or a white-space |
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// 000.6 to .6, -0.8 to -.8, 0050 to 50, -01.05 to -1.05 |
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$css = preg_replace('/((?<!\\\\)\:|\s)(\-?)0+(\.?\d+)/S', '$1$2$3', $css); |
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|
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// Remove trailing zeros from float numbers preceded by : or a white-space |
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// -6.0100em to -6.01em, .0100 to .01, 1.200px to 1.2px |
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$css = preg_replace('/((?<!\\\\)\:|\s)(\-?)(\d?\.\d+?)0+([^\d])/S', '$1$2$3$4', $css); |
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|
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// Remove trailing .0 -> -9.0 to -9 |
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$css = preg_replace('/((?<!\\\\)\:|\s)(\-?\d+)\.0([^\d])/S', '$1$2$3', $css); |
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|
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// Replace 0 length numbers with 0 |
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$css = preg_replace('/((?<!\\\\)\:|\s)\-?\.?0+([^\d])/S', '${1}0$2', $css); |
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|
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// Remove the spaces before the things that should not have spaces before them. |
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// But, be careful not to turn "p :link {...}" into "p:link{...}" |
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// Swap out any pseudo-class colons with the token, and then swap back. |
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$css = preg_replace_callback('/(?:^|\})[^\{]*\s+\:/', array($this, 'replace_colon'), $css); |
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|
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// Remove spaces before the things that should not have spaces before them. |
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$css = preg_replace('/\s+([\!\{\}\;\:\>\+\(\)\]\~\=,])/', '$1', $css); |
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|
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// Restore spaces for !important |
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$css = preg_replace('/\!important/i', ' !important', $css); |
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|
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// bring back the colon |
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$css = preg_replace('/' . self::CLASSCOLON . '/', ':', $css); |
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|
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// retain space for special IE6 cases |
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$css = preg_replace_callback('/\:first\-(line|letter)(\{|,)/i', array($this, 'lowercase_pseudo_first'), $css); |
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|
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// no space after the end of a preserved comment |
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$css = preg_replace('/\*\/ /', '*/', $css); |
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|
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// lowercase some popular @directives |
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$css = preg_replace_callback('/@(font-face|import|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?keyframe|media|page|namespace)/i', array($this, 'lowercase_directives'), $css); |
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|
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// lowercase some more common pseudo-elements |
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$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); |
| 316 |
|
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// lowercase some more common functions |
| 318 |
$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); |
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|
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// lower case some common function that can be values |
| 321 |
// NOTE: rgb() isn't useful as we replace with #hex later, as well as and() is already done for us |
| 322 |
$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); |
| 323 |
|
| 324 |
// Put the space back in some cases, to support stuff like |
| 325 |
// @media screen and (-webkit-min-device-pixel-ratio:0){ |
| 326 |
$css = preg_replace('/\band\(/i', 'and (', $css); |
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|
| 328 |
// Remove the spaces after the things that should not have spaces after them. |
| 329 |
$css = preg_replace('/([\!\{\}\:;\>\+\(\[\~\=,])\s+/S', '$1', $css); |
| 330 |
|
| 331 |
// remove unnecessary semicolons |
| 332 |
$css = preg_replace('/;+\}/', '}', $css); |
| 333 |
|
| 334 |
// Fix for issue: #2528146 |
| 335 |
// Restore semicolon if the last property is prefixed with a `*` (lte IE7 hack) |
| 336 |
// to avoid issues on Symbian S60 3.x browsers. |
| 337 |
$css = preg_replace('/(\*[a-z0-9\-]+\s*\:[^;\}]+)(\})/', '$1;$2', $css); |
| 338 |
|
| 339 |
// Replace 0 <length> and 0 <percentage> values with 0. |
| 340 |
// <length> data type: https://developer.mozilla.org/en-US/docs/Web/CSS/length |
| 341 |
// <percentage> data type: https://developer.mozilla.org/en-US/docs/Web/CSS/percentage |
| 342 |
$css = preg_replace('/([^\\\\]\:|\s)0(?:em|ex|ch|rem|vw|vh|vm|vmin|cm|mm|in|px|pt|pc|%)/iS', '${1}0', $css); |
| 343 |
|
| 344 |
// 0% step in a keyframe? restore the % unit |
| 345 |
$css = preg_replace_callback('/(@[a-z\-]*?keyframes[^\{]+\{)(.*?)(\}\})/iS', array($this, 'replace_keyframe_zero'), $css); |
| 346 |
|
| 347 |
// Replace 0 0; or 0 0 0; or 0 0 0 0; with 0. |
| 348 |
$css = preg_replace('/\:0(?: 0){1,3}(;|\}| \!)/', ':0$1', $css); |
| 349 |
|
| 350 |
// Fix for issue: #2528142 |
| 351 |
// Replace text-shadow:0; with text-shadow:0 0 0; |
| 352 |
$css = preg_replace('/(text-shadow\:0)(;|\}| \!)/i', '$1 0 0$2', $css); |
| 353 |
|
| 354 |
// Replace background-position:0; with background-position:0 0; |
| 355 |
// same for transform-origin |
| 356 |
// Changing -webkit-mask-position: 0 0 to just a single 0 will result in the second parameter defaulting to 50% (center) |
| 357 |
$css = preg_replace('/(background\-position|webkit-mask-position|(?:webkit|moz|o|ms|)\-?transform\-origin)\:0(;|\}| \!)/iS', '$1:0 0$2', $css); |
| 358 |
|
| 359 |
// Shorten colors from rgb(51,102,153) to #336699, rgb(100%,0%,0%) to #ff0000 (sRGB color space) |
| 360 |
// Shorten colors from hsl(0, 100%, 50%) to #ff0000 (sRGB color space) |
| 361 |
// This makes it more likely that it'll get further compressed in the next step. |
| 362 |
$css = preg_replace_callback('/rgb\s*\(\s*([0-9,\s\-\.\%]+)\s*\)(.{1})/i', array($this, 'rgb_to_hex'), $css); |
| 363 |
$css = preg_replace_callback('/hsl\s*\(\s*([0-9,\s\-\.\%]+)\s*\)(.{1})/i', array($this, 'hsl_to_hex'), $css); |
| 364 |
|
| 365 |
// Shorten colors from #AABBCC to #ABC or short color name. |
| 366 |
$css = $this->compress_hex_colors($css); |
| 367 |
|
| 368 |
// border: none to border:0, outline: none to outline:0 |
| 369 |
$css = preg_replace('/(border\-?(?:top|right|bottom|left|)|outline)\:none(;|\}| \!)/iS', '$1:0$2', $css); |
| 370 |
|
| 371 |
// shorter opacity IE filter |
| 372 |
$css = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $css); |
| 373 |
|
| 374 |
// Find a fraction that is used for Opera's -o-device-pixel-ratio query |
| 375 |
// Add token to add the "\" back in later |
| 376 |
$css = preg_replace('/\(([a-z\-]+):([0-9]+)\/([0-9]+)\)/i', '($1:$2'. self::QUERY_FRACTION .'$3)', $css); |
| 377 |
|
| 378 |
// Remove empty rules. |
| 379 |
$css = preg_replace('/[^\};\{\/]+\{\}/S', '', $css); |
| 380 |
|
| 381 |
// Add "/" back to fix Opera -o-device-pixel-ratio query |
| 382 |
$css = preg_replace('/'. self::QUERY_FRACTION .'/', '/', $css); |
| 383 |
|
| 384 |
// Replace multiple semi-colons in a row by a single one |
| 385 |
// See SF bug #1980989 |
| 386 |
$css = preg_replace('/;;+/', ';', $css); |
| 387 |
|
| 388 |
// Restore new lines for /*! important comments |
| 389 |
$css = preg_replace('/'. self::NL .'/', "\n", $css); |
| 390 |
|
| 391 |
// Lowercase all uppercase properties |
| 392 |
$css = preg_replace_callback('/(\{|\;)([A-Z\-]+)(\:)/', array($this, 'lowercase_properties'), $css); |
| 393 |
|
| 394 |
// Some source control tools don't like it when files containing lines longer |
| 395 |
// than, say 8000 characters, are checked in. The linebreak option is used in |
| 396 |
// that case to split long lines after a specific column. |
| 397 |
if ($linebreak_pos !== FALSE && (int) $linebreak_pos >= 0) { |
| 398 |
$linebreak_pos = (int) $linebreak_pos; |
| 399 |
$start_index = $i = 0; |
| 400 |
while ($i < strlen($css)) { |
| 401 |
$i++; |
| 402 |
if ($css[$i - 1] === '}' && $i - $start_index > $linebreak_pos) { |
| 403 |
$css = $this->str_slice($css, 0, $i) . "\n" . $this->str_slice($css, $i); |
| 404 |
$start_index = $i; |
| 405 |
} |
| 406 |
} |
| 407 |
} |
| 408 |
|
| 409 |
// restore preserved comments and strings in reverse order |
| 410 |
for ($i = count($this->preserved_tokens) - 1; $i >= 0; $i--) { |
| 411 |
$css = preg_replace('/' . self::TOKEN . $i . '___/', $this->preserved_tokens[$i], $css, 1); |
| 412 |
} |
| 413 |
|
| 414 |
// Trim the final string (for any leading or trailing white spaces) |
| 415 |
return trim($css); |
| 416 |
} |
| 417 |
|
| 418 |
/** |
| 419 |
* Utility method to replace all data urls with tokens before we start |
| 420 |
* compressing, to avoid performance issues running some of the subsequent |
| 421 |
* regexes against large strings chunks. |
| 422 |
* |
| 423 |
* @param string $css |
| 424 |
* @return string |
| 425 |
*/ |
| 426 |
private function extract_data_urls($css) |
| 427 |
{ |
| 428 |
// Leave data urls alone to increase parse performance. |
| 429 |
$max_index = strlen($css) - 1; |
| 430 |
$append_index = $index = $last_index = $offset = 0; |
| 431 |
$sb = array(); |
| 432 |
$pattern = '/url\(\s*(["\']?)data\:/i'; |
| 433 |
|
| 434 |
// Since we need to account for non-base64 data urls, we need to handle |
| 435 |
// ' and ) being part of the data string. Hence switching to indexOf, |
| 436 |
// to determine whether or not we have matching string terminators and |
| 437 |
// handling sb appends directly, instead of using matcher.append* methods. |
| 438 |
|
| 439 |
while (preg_match($pattern, $css, $m, 0, $offset)) { |
| 440 |
$index = $this->index_of($css, $m[0], $offset); |
| 441 |
$last_index = $index + strlen($m[0]); |
| 442 |
$start_index = $index + 4; // "url(".length() |
| 443 |
$end_index = $last_index - 1; |
| 444 |
$terminator = $m[1]; // ', " or empty (not quoted) |
| 445 |
$found_terminator = FALSE; |
| 446 |
|
| 447 |
if (strlen($terminator) === 0) { |
| 448 |
$terminator = ')'; |
| 449 |
} |
| 450 |
|
| 451 |
while ($found_terminator === FALSE && $end_index+1 <= $max_index) { |
| 452 |
$end_index = $this->index_of($css, $terminator, $end_index + 1); |
| 453 |
|
| 454 |
// endIndex == 0 doesn't really apply here |
| 455 |
if ($end_index > 0 && substr($css, $end_index - 1, 1) !== '\\') { |
| 456 |
$found_terminator = TRUE; |
| 457 |
if (')' != $terminator) { |
| 458 |
$end_index = $this->index_of($css, ')', $end_index); |
| 459 |
} |
| 460 |
} |
| 461 |
} |
| 462 |
|
| 463 |
// Enough searching, start moving stuff over to the buffer |
| 464 |
$sb[] = $this->str_slice($css, $append_index, $index); |
| 465 |
|
| 466 |
if ($found_terminator) { |
| 467 |
$token = $this->str_slice($css, $start_index, $end_index); |
| 468 |
$token = preg_replace('/\s+/', '', $token); |
| 469 |
$this->preserved_tokens[] = $token; |
| 470 |
|
| 471 |
$preserver = 'url(' . self::TOKEN . (count($this->preserved_tokens) - 1) . '___)'; |
| 472 |
$sb[] = $preserver; |
| 473 |
|
| 474 |
$append_index = $end_index + 1; |
| 475 |
} else { |
| 476 |
// No end terminator found, re-add the whole match. Should we throw/warn here? |
| 477 |
$sb[] = $this->str_slice($css, $index, $last_index); |
| 478 |
$append_index = $last_index; |
| 479 |
} |
| 480 |
|
| 481 |
$offset = $last_index; |
| 482 |
} |
| 483 |
|
| 484 |
$sb[] = $this->str_slice($css, $append_index); |
| 485 |
|
| 486 |
return implode('', $sb); |
| 487 |
} |
| 488 |
|
| 489 |
/** |
| 490 |
* Utility method to compress hex color values of the form #AABBCC to #ABC or short color name. |
| 491 |
* |
| 492 |
* DOES NOT compress CSS ID selectors which match the above pattern (which would break things). |
| 493 |
* e.g. #AddressForm { ... } |
| 494 |
* |
| 495 |
* DOES NOT compress IE filters, which have hex color values (which would break things). |
| 496 |
* e.g. filter: chroma(color="#FFFFFF"); |
| 497 |
* |
| 498 |
* DOES NOT compress invalid hex values. |
| 499 |
* e.g. background-color: #aabbccdd |
| 500 |
* |
| 501 |
* @param string $css |
| 502 |
* @return string |
| 503 |
*/ |
| 504 |
private function compress_hex_colors($css) |
| 505 |
{ |
| 506 |
// Look for hex colors inside { ... } (to avoid IDs) and which don't have a =, or a " in front of them (to avoid filters) |
| 507 |
$pattern = '/(\=\s*?["\']?)?#([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])(\}|[^0-9a-f{][^{]*?\})/iS'; |
| 508 |
$_index = $index = $last_index = $offset = 0; |
| 509 |
$sb = array(); |
| 510 |
// See: http://ajaxmin.codeplex.com/wikipage?title=CSS%20Colors |
| 511 |
$short_safe = array( |
| 512 |
'#808080' => 'gray', |
| 513 |
'#008000' => 'green', |
| 514 |
'#800000' => 'maroon', |
| 515 |
'#000080' => 'navy', |
| 516 |
'#808000' => 'olive', |
| 517 |
'#ffa500' => 'orange', |
| 518 |
'#800080' => 'purple', |
| 519 |
'#c0c0c0' => 'silver', |
| 520 |
'#008080' => 'teal', |
| 521 |
'#f00' => 'red' |
| 522 |
); |
| 523 |
|
| 524 |
while (preg_match($pattern, $css, $m, 0, $offset)) { |
| 525 |
$index = $this->index_of($css, $m[0], $offset); |
| 526 |
$last_index = $index + strlen($m[0]); |
| 527 |
$is_filter = $m[1] !== null && $m[1] !== ''; |
| 528 |
|
| 529 |
$sb[] = $this->str_slice($css, $_index, $index); |
| 530 |
|
| 531 |
if ($is_filter) { |
| 532 |
// Restore, maintain case, otherwise filter will break |
| 533 |
$sb[] = $m[1] . '#' . $m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]; |
| 534 |
} else { |
| 535 |
if (strtolower($m[2]) == strtolower($m[3]) && |
| 536 |
strtolower($m[4]) == strtolower($m[5]) && |
| 537 |
strtolower($m[6]) == strtolower($m[7])) { |
| 538 |
// Compress. |
| 539 |
$hex = '#' . strtolower($m[3] . $m[5] . $m[7]); |
| 540 |
} else { |
| 541 |
// Non compressible color, restore but lower case. |
| 542 |
$hex = '#' . strtolower($m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]); |
| 543 |
} |
| 544 |
// replace Hex colors to short safe color names |
| 545 |
$sb[] = array_key_exists($hex, $short_safe) ? $short_safe[$hex] : $hex; |
| 546 |
} |
| 547 |
|
| 548 |
$_index = $offset = $last_index - strlen($m[8]); |
| 549 |
} |
| 550 |
|
| 551 |
$sb[] = $this->str_slice($css, $_index); |
| 552 |
|
| 553 |
return implode('', $sb); |
| 554 |
} |
| 555 |
|
| 556 |
/* CALLBACKS |
| 557 |
* --------------------------------------------------------------------------------------------- |
| 558 |
*/ |
| 559 |
|
| 560 |
private function replace_string($matches) |
| 561 |
{ |
| 562 |
$match = $matches[0]; |
| 563 |
$quote = substr($match, 0, 1); |
| 564 |
// Must use addcslashes in PHP to avoid parsing of backslashes |
| 565 |
$match = addcslashes($this->str_slice($match, 1, -1), '\\'); |
| 566 |
|
| 567 |
// maybe the string contains a comment-like substring? |
| 568 |
// one, maybe more? put'em back then |
| 569 |
if (($pos = $this->index_of($match, self::COMMENT)) >= 0) { |
| 570 |
for ($i = 0, $max = count($this->comments); $i < $max; $i++) { |
| 571 |
$match = preg_replace('/' . self::COMMENT . $i . '___/', $this->comments[$i], $match, 1); |
| 572 |
} |
| 573 |
} |
| 574 |
|
| 575 |
// minify alpha opacity in filter strings |
| 576 |
$match = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $match); |
| 577 |
|
| 578 |
$this->preserved_tokens[] = $match; |
| 579 |
return $quote . self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . $quote; |
| 580 |
} |
| 581 |
|
| 582 |
private function replace_colon($matches) |
| 583 |
{ |
| 584 |
return preg_replace('/\:/', self::CLASSCOLON, $matches[0]); |
| 585 |
} |
| 586 |
|
| 587 |
private function replace_calc($matches) |
| 588 |
{ |
| 589 |
$this->preserved_tokens[] = trim(preg_replace('/\s*([\*\/\(\),])\s*/', '$1', $matches[2])); |
| 590 |
return 'calc('. self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . ')'; |
| 591 |
} |
| 592 |
|
| 593 |
private function preserve_old_IE_specific_matrix_definition($matches) |
| 594 |
{ |
| 595 |
$this->preserved_tokens[] = $matches[1]; |
| 596 |
return 'filter:progid:DXImageTransform.Microsoft.Matrix(' . self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . ')'; |
| 597 |
} |
| 598 |
|
| 599 |
private function replace_keyframe_zero($matches) |
| 600 |
{ |
| 601 |
return $matches[1] . preg_replace('/0(\{|,[^\)\{]+\{)/', '0%$1', $matches[2]) . $matches[3]; |
| 602 |
} |
| 603 |
|
| 604 |
private function rgb_to_hex($matches) |
| 605 |
{ |
| 606 |
// Support for percentage values rgb(100%, 0%, 45%); |
| 607 |
if ($this->index_of($matches[1], '%') >= 0){ |
| 608 |
$rgbcolors = explode(',', str_replace('%', '', $matches[1])); |
| 609 |
for ($i = 0; $i < count($rgbcolors); $i++) { |
| 610 |
$rgbcolors[$i] = $this->round_number(floatval($rgbcolors[$i]) * 2.55); |
| 611 |
} |
| 612 |
} else { |
| 613 |
$rgbcolors = explode(',', $matches[1]); |
| 614 |
} |
| 615 |
|
| 616 |
// Values outside the sRGB color space should be clipped (0-255) |
| 617 |
for ($i = 0; $i < count($rgbcolors); $i++) { |
| 618 |
$rgbcolors[$i] = $this->clamp_number(intval($rgbcolors[$i], 10), 0, 255); |
| 619 |
$rgbcolors[$i] = sprintf("%02x", $rgbcolors[$i]); |
| 620 |
} |
| 621 |
|
| 622 |
// Fix for issue #2528093 |
| 623 |
if (!preg_match('/[\s\,\);\}]/', $matches[2])){ |
| 624 |
$matches[2] = ' ' . $matches[2]; |
| 625 |
} |
| 626 |
|
| 627 |
return '#' . implode('', $rgbcolors) . $matches[2]; |
| 628 |
} |
| 629 |
|
| 630 |
private function hsl_to_hex($matches) |
| 631 |
{ |
| 632 |
$values = explode(',', str_replace('%', '', $matches[1])); |
| 633 |
$h = floatval($values[0]); |
| 634 |
$s = floatval($values[1]); |
| 635 |
$l = floatval($values[2]); |
| 636 |
|
| 637 |
// Wrap and clamp, then fraction! |
| 638 |
$h = ((($h % 360) + 360) % 360) / 360; |
| 639 |
$s = $this->clamp_number($s, 0, 100) / 100; |
| 640 |
$l = $this->clamp_number($l, 0, 100) / 100; |
| 641 |
|
| 642 |
if ($s == 0) { |
| 643 |
$r = $g = $b = $this->round_number(255 * $l); |
| 644 |
} else { |
| 645 |
$v2 = $l < 0.5 ? $l * (1 + $s) : ($l + $s) - ($s * $l); |
| 646 |
$v1 = (2 * $l) - $v2; |
| 647 |
$r = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h + (1/3))); |
| 648 |
$g = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h)); |
| 649 |
$b = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h - (1/3))); |
| 650 |
} |
| 651 |
|
| 652 |
return $this->rgb_to_hex(array('', $r.','.$g.','.$b, $matches[2])); |
| 653 |
} |
| 654 |
|
| 655 |
private function lowercase_pseudo_first($matches) |
| 656 |
{ |
| 657 |
return ':first-'. strtolower($matches[1]) .' '. $matches[2]; |
| 658 |
} |
| 659 |
|
| 660 |
private function lowercase_directives($matches) |
| 661 |
{ |
| 662 |
return '@'. strtolower($matches[1]); |
| 663 |
} |
| 664 |
|
| 665 |
private function lowercase_pseudo_elements($matches) |
| 666 |
{ |
| 667 |
return ':'. strtolower($matches[1]); |
| 668 |
} |
| 669 |
|
| 670 |
private function lowercase_common_functions($matches) |
| 671 |
{ |
| 672 |
return ':'. strtolower($matches[1]) .'('; |
| 673 |
} |
| 674 |
|
| 675 |
private function lowercase_common_functions_values($matches) |
| 676 |
{ |
| 677 |
return $matches[1] . strtolower($matches[2]); |
| 678 |
} |
| 679 |
|
| 680 |
private function lowercase_properties($matches) |
| 681 |
{ |
| 682 |
return $matches[1].strtolower($matches[2]).$matches[3]; |
| 683 |
} |
| 684 |
|
| 685 |
/* HELPERS |
| 686 |
* --------------------------------------------------------------------------------------------- |
| 687 |
*/ |
| 688 |
|
| 689 |
private function hue_to_rgb($v1, $v2, $vh) |
| 690 |
{ |
| 691 |
$vh = $vh < 0 ? $vh + 1 : ($vh > 1 ? $vh - 1 : $vh); |
| 692 |
if ($vh * 6 < 1) return $v1 + ($v2 - $v1) * 6 * $vh; |
| 693 |
if ($vh * 2 < 1) return $v2; |
| 694 |
if ($vh * 3 < 2) return $v1 + ($v2 - $v1) * ((2/3) - $vh) * 6; |
| 695 |
return $v1; |
| 696 |
} |
| 697 |
|
| 698 |
private function round_number($n) |
| 699 |
{ |
| 700 |
return intval(floor(floatval($n) + 0.5), 10); |
| 701 |
} |
| 702 |
|
| 703 |
private function clamp_number($n, $min, $max) |
| 704 |
{ |
| 705 |
return min(max($n, $min), $max); |
| 706 |
} |
| 707 |
|
| 708 |
/** |
| 709 |
* PHP port of Javascript's "indexOf" function for strings only |
| 710 |
* Author: Tubal Martin http://blog.margenn.com |
| 711 |
* |
| 712 |
* @param string $haystack |
| 713 |
* @param string $needle |
| 714 |
* @param int $offset index (optional) |
| 715 |
* @return int |
| 716 |
*/ |
| 717 |
private function index_of($haystack, $needle, $offset = 0) |
| 718 |
{ |
| 719 |
$index = strpos($haystack, $needle, $offset); |
| 720 |
|
| 721 |
return ($index !== FALSE) ? $index : -1; |
| 722 |
} |
| 723 |
|
| 724 |
/** |
| 725 |
* PHP port of Javascript's "slice" function for strings only |
| 726 |
* Author: Tubal Martin http://blog.margenn.com |
| 727 |
* Tests: http://margenn.com/tubal/str_slice/ |
| 728 |
* |
| 729 |
* @param string $str |
| 730 |
* @param int $start index |
| 731 |
* @param int|bool $end index (optional) |
| 732 |
* @return string |
| 733 |
*/ |
| 734 |
private function str_slice($str, $start = 0, $end = FALSE) |
| 735 |
{ |
| 736 |
if ($end !== FALSE && ($start < 0 || $end <= 0)) { |
| 737 |
$max = strlen($str); |
| 738 |
|
| 739 |
if ($start < 0) { |
| 740 |
if (($start = $max + $start) < 0) { |
| 741 |
return ''; |
| 742 |
} |
| 743 |
} |
| 744 |
|
| 745 |
if ($end < 0) { |
| 746 |
if (($end = $max + $end) < 0) { |
| 747 |
return ''; |
| 748 |
} |
| 749 |
} |
| 750 |
|
| 751 |
if ($end <= $start) { |
| 752 |
return ''; |
| 753 |
} |
| 754 |
} |
| 755 |
|
| 756 |
$slice = ($end === FALSE) ? substr($str, $start) : substr($str, $start, $end - $start); |
| 757 |
return ($slice === FALSE) ? '' : $slice; |
| 758 |
} |
| 759 |
|
| 760 |
/** |
| 761 |
* Convert strings like "64M" or "30" to int values |
| 762 |
* @param mixed $size |
| 763 |
* @return int |
| 764 |
*/ |
| 765 |
private function normalize_int($size) |
| 766 |
{ |
| 767 |
if (is_string($size)) { |
| 768 |
switch (substr($size, -1)) { |
| 769 |
case 'M': case 'm': return $size * 1048576; |
| 770 |
case 'K': case 'k': return $size * 1024; |
| 771 |
case 'G': case 'g': return $size * 1073741824; |
| 772 |
} |
| 773 |
} |
| 774 |
|
| 775 |
return (int) $size; |
| 776 |
} |
| 777 |
} |
