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545 lines
17 KiB
PHP
545 lines
17 KiB
PHP
<?php
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/*!
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* cssmin.php rev 91c5ea5
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* Author: Tubal Martin - http://blog.margenn.com/
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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 Javascript port of the CSS minification tool
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* distributed with YUICompressor, itself a port of the cssmin utility by
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* 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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* 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) 2011 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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class CSSmin
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{
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private $comments = array();
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private $preserved_tokens = array();
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public function run($css, $linebreak_pos = FALSE)
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{
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// Try to increase the memory limit for this script
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ini_set('memory_limit', '128M');
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// Try to increase the PCRE limits
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ini_set('pcre.backtrack_limit', 1000 * 1000);
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ini_set('pcre.recursion_limit', 500 * 1000);
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$start_index = 0;
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$length = strlen($css);
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$css = $this->extract_data_urls($css);
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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 = $length;
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}
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$this->comments[] = $this->str_slice($css, $start_index + 2, $end_index);
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$css = $this->str_slice($css, 0, $start_index + 2) . '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_' . (count($this->comments) - 1) . '___' . $this->str_slice($css, $end_index);
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$start_index += 2;
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}
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// preserve strings so their content doesn't get accidentally minified
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$css = preg_replace_callback('/(?:"(?:[^\\\\"]|\\\\.|\\\\)*")|'."(?:'(?:[^\\\\']|\\\\.|\\\\)*')/", array($this, 'callback_one'), $css);
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// Let's divide css code in chunks of 25.000 chars aprox.
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// Reason: PHP's PCRE functions like preg_replace have a "backtrack limit" of 100.000 chars by default (php < 5.3.7)
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// so if we're dealing with really 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 returning NULL and
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// $css would be empty.
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$charset = '';
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$charset_regexp = '/@charset [^;]+;/i';
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$css_chunks = array();
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$css_chunk_length = 25000; // aprox size, not exact
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$start_index = 0;
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$i = $css_chunk_length; // save initial iterations
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$l = strlen($css);
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// if the number of characters is 25000 or less, do not chunk
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if ($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. 500 checks for a closing curly brace }
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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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$css_chunks[] = $this->str_slice($css, $start_index, $i);
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$start_index = $i;
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}
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}
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}
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// Minify each chunk
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for ($i = 0, $n = count($css_chunks); $i < $n; $i++) {
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$css_chunks[$i] = $this->minify($css_chunks[$i], $linebreak_pos);
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// If there is a @charset in a css chunk...
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if (empty($charset) && preg_match($charset_regexp, $css_chunks[$i], $matches)) {
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// delete all of them no matter the chunk
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$css_chunks[$i] = preg_replace($charset_regexp, '', $css_chunks[$i]);
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$charset = $matches[0];
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}
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}
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// Update the first chunk and put the charset to the top of the file.
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$css_chunks[0] = $charset . $css_chunks[0];
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return implode('', $css_chunks);
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}
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private function minify($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; $i++) {
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$token = $this->comments[$i];
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$placeholder = '/___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_' . $i . '___/';
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// ! in the first position of the comment means preserve
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// so push to the preserved tokens keeping the !
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if (substr($token, 0, 1) === '!') {
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$this->preserved_tokens[] = $token;
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$css = preg_replace($placeholder, '___YUICSSMIN_PRESERVED_TOKEN_' . (count($this->preserved_tokens) - 1) . '___', $css, 1);
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continue;
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}
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// \ in the last position looks like hack for Mac/IE5
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// shorten that to /*\*/ and the next one to /**/
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if (substr($token, (strlen($token) - 1), 1) === '\\') {
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$this->preserved_tokens[] = '\\';
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$css = preg_replace($placeholder, '___YUICSSMIN_PRESERVED_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('/___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_' . $i . '___/', '___YUICSSMIN_PRESERVED_TOKEN_' . (count($this->preserved_tokens) - 1) . '___', $css, 1);
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continue;
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}
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// keep empty comments after child selectors (IE7 hack)
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// e.g. html >/**/ body
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if (strlen($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, '___YUICSSMIN_PRESERVED_TOKEN_' . (count($this->preserved_tokens) - 1) . '___', $css, 1);
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}
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}
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}
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// in all other cases kill the comment
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$css = preg_replace('/\/\*' . $this->str_slice($placeholder, 1, -1) . '\*\//', '', $css, 1);
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}
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// Normalize all whitespace strings to single spaces. Easier to work with that way.
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$css = preg_replace('/\s+/', ' ', $css);
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// Remove the spaces before the things that should not have spaces before them.
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// But, be careful not to turn "p :link {...}" into "p:link{...}"
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// Swap out any pseudo-class colons with the token, and then swap back.
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$css = preg_replace_callback('/(?:^|\})(?:(?:[^\{\:])+\:)+(?:[^\{]*\{)/', array($this, 'callback_two'), $css);
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$css = preg_replace('/\s+([\!\{\}\;\:\>\+\(\)\],])/', '$1', $css);
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$css = preg_replace('/___YUICSSMIN_PSEUDOCLASSCOLON___/', ':', $css);
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// retain space for special IE6 cases
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$css = preg_replace('/\:first\-(line|letter)(\{|,)/', ':first-$1 $2', $css);
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// no space after the end of a preserved comment
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$css = preg_replace('/\*\/ /', '*/', $css);
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// Put the space back in some cases, to support stuff like
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// @media screen and (-webkit-min-device-pixel-ratio:0){
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$css = preg_replace('/\band\(/i', 'and (', $css);
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// Remove the spaces after the things that should not have spaces after them.
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$css = preg_replace('/([\!\{\}\:;\>\+\(\[,])\s+/', '$1', $css);
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// remove unnecessary semicolons
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$css = preg_replace('/;+\}/', '}', $css);
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// Replace 0(px,em,%) with 0.
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$css = preg_replace('/([\s\:])(0)(?:px|em|%|in|cm|mm|pc|pt|ex)/i', '$1$2', $css);
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// Replace 0 0 0 0; with 0.
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$css = preg_replace('/\:0 0 0 0(;|\})/', ':0$1', $css);
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$css = preg_replace('/\:0 0 0(;|\})/', ':0$1', $css);
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$css = preg_replace('/\:0 0(;|\})/', ':0$1', $css);
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// Replace background-position:0; with background-position:0 0;
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// same for transform-origin
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$css = preg_replace_callback('/(background\-position|transform\-origin|webkit\-transform\-origin|moz\-transform\-origin|o-transform\-origin|ms\-transform\-origin)\:0(;|\})/i', array($this, 'callback_three'), $css);
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// Replace 0.6 to .6, but only when preceded by : or a white-space
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$css = preg_replace('/(\:|\s)0+\.(\d+)/', '$1.$2', $css);
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// Shorten colors from rgb(51,102,153) to #336699
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// This makes it more likely that it'll get further compressed in the next step.
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$css = preg_replace_callback('/rgb\s*\(\s*([0-9,\s]+)\s*\)/i', array($this, 'callback_four'), $css);
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// Shorten colors from #AABBCC to #ABC.
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$css = $this->compress_hex_colors($css);
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// border: none -> border:0
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$css = preg_replace_callback('/(border|border\-top|border\-right|border\-bottom|border\-right|outline|background)\:none(;|\})/i', array($this, 'callback_five'), $css);
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// shorter opacity IE filter
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$css = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $css);
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// Remove empty rules.
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$css = preg_replace('/[^\};\{\/]+\{\}/', '', $css);
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// Some source control tools don't like it when files containing lines longer
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// than, say 8000 characters, are checked in. The linebreak option is used in
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// that case to split long lines after a specific column.
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if ($linebreak_pos !== FALSE && (int) $linebreak_pos >= 0) {
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$linebreak_pos = (int) $linebreak_pos;
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$start_index = $i = 0;
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while ($i < strlen($css)) {
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$i++;
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if ($css[$i - 1] === '}' && $i - $start_index > $linebreak_pos) {
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$css = $this->str_slice($css, 0, $i) . "\n" . $this->str_slice($css, $i);
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$start_index = $i;
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}
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}
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}
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// Replace multiple semi-colons in a row by a single one
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// See SF bug #1980989
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$css = preg_replace('/;;+/', ';', $css);
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// restore preserved comments and strings
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for ($i = 0, $max = count($this->preserved_tokens); $i < $max; $i++) {
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$css = preg_replace('/___YUICSSMIN_PRESERVED_TOKEN_' . $i . '___/', $this->preserved_tokens[$i], $css, 1);
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}
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// Trim the final string (for any leading or trailing white spaces)
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$css = preg_replace('/^\s+|\s+$/', '', $css);
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return $css;
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}
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/**
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* Utility method to replace all data urls with tokens before we start
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* compressing, to avoid performance issues running some of the subsequent
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* regexes against large strings chunks.
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*/
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private function extract_data_urls($css)
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{
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// Leave data urls alone to increase parse performance.
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$max_index = strlen($css) - 1;
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$append_index = $index = $last_index = $offset = 0;
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$sb = array();
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$pattern = '/url\(\s*(["\']?)data\:/';
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// Since we need to account for non-base64 data urls, we need to handle
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// ' and ) being part of the data string. Hence switching to indexOf,
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// to determine whether or not we have matching string terminators and
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// handling sb appends directly, instead of using matcher.append* methods.
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while (preg_match($pattern, $css, $m, 0, $offset)) {
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$index = $this->index_of($css, $m[0], $offset);
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$last_index = $index + strlen($m[0]);
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$start_index = $index + 4; // "url(".length()
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$end_index = $last_index - 1;
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$terminator = $m[1]; // ', " or empty (not quoted)
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$found_terminator = FALSE;
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if (strlen($terminator) === 0) {
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$terminator = ')';
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}
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while ($found_terminator === FALSE && $end_index+1 <= $max_index) {
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$end_index = $this->index_of($css, $terminator, $end_index + 1);
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// endIndex == 0 doesn't really apply here
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if ($end_index > 0 && substr($css, $end_index - 1, 1) !== '\\') {
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$found_terminator = TRUE;
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if (')' != $terminator) {
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$end_index = $this->index_of($css, ')', $end_index);
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}
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}
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}
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// Enough searching, start moving stuff over to the buffer
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$sb[] = $this->substring($css, $append_index, $index);
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if ($found_terminator) {
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$token = $this->substring($css, $start_index, $end_index);
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$token = preg_replace('/\s+/', '', $token);
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$this->preserved_tokens[] = $token;
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$preserver = 'url(___YUICSSMIN_PRESERVED_TOKEN_' . (count($this->preserved_tokens) - 1) . '___)';
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$sb[] = $preserver;
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$append_index = $end_index + 1;
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} else {
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// No end terminator found, re-add the whole match. Should we throw/warn here?
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$sb[] = $this->substring($css, $index, $last_index);
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$append_index = $last_index;
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}
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$offset = $last_index;
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}
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$sb[] = $this->substring($css, $append_index);
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return implode('', $sb);
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}
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/**
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* Utility method to compress hex color values of the form #AABBCC to #ABC.
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*
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* DOES NOT compress CSS ID selectors which match the above pattern (which would break things).
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* e.g. #AddressForm { ... }
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*
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* DOES NOT compress IE filters, which have hex color values (which would break things).
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* e.g. filter: chroma(color="#FFFFFF");
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*
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* DOES NOT compress invalid hex values.
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* e.g. background-color: #aabbccdd
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*/
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private function compress_hex_colors($css)
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{
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// Look for hex colors inside { ... } (to avoid IDs) and which don't have a =, or a " in front of them (to avoid filters)
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$pattern = '/(\=\s*?["\']?)?#([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])(\}|[^0-9a-f{][^{]*?\})/i';
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$_index = $index = $last_index = $offset = 0;
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$sb = array();
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while (preg_match($pattern, $css, $m, 0, $offset)) {
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$index = $this->index_of($css, $m[0], $offset);
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$last_index = $index + strlen($m[0]);
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$is_filter = (bool) $m[1];
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$sb[] = $this->substring($css, $_index, $index);
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if ($is_filter) {
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// Restore, maintain case, otherwise filter will break
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$sb[] = $m[1] . '#' . $m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7];
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} else {
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if (strtolower($m[2]) == strtolower($m[3]) &&
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strtolower($m[4]) == strtolower($m[5]) &&
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strtolower($m[6]) == strtolower($m[7])) {
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// Compress.
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$sb[] = '#' . strtolower($m[3] . $m[5] . $m[7]);
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} else {
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// Non compressible color, restore but lower case.
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$sb[] = '#' . strtolower($m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]);
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}
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}
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$_index = $offset = $last_index - strlen($m[8]);
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}
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$sb[] = $this->substring($css, $_index);
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return implode('', $sb);
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}
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/* CALLBACKS
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* ---------------------------------------------------------------------------------------------
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*/
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private function callback_one($matches)
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{
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$match = $matches[0];
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$quote = substr($match, 0, 1);
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// Must use addcslashes in PHP to avoid parsing of backslashes
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$match = addcslashes($this->str_slice($match, 1, -1), '\\');
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// maybe the string contains a comment-like substring?
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// one, maybe more? put'em back then
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if (($pos = $this->index_of($match, '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_')) >= 0) {
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for ($i = 0, $max = count($this->comments); $i < $max; $i++) {
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$match = preg_replace('/___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_' . $i . '___/', $this->comments[$i], $match, 1);
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}
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}
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// minify alpha opacity in filter strings
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$match = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $match);
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$this->preserved_tokens[] = $match;
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return $quote . '___YUICSSMIN_PRESERVED_TOKEN_' . (count($this->preserved_tokens) - 1) . '___' . $quote;
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}
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private function callback_two($matches)
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{
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return preg_replace('/\:/', '___YUICSSMIN_PSEUDOCLASSCOLON___', $matches[0]);
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}
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private function callback_three($matches)
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{
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return strtolower($matches[1]) . ':0 0' . $matches[2];
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}
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private function callback_four($matches)
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{
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$rgbcolors = explode(',', $matches[1]);
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for ($i = 0; $i < count($rgbcolors); $i++) {
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$rgbcolors[$i] = base_convert(strval(intval($rgbcolors[$i], 10)), 10, 16);
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if (strlen($rgbcolors[$i]) === 1) {
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$rgbcolors[$i] = '0' . $rgbcolors[$i];
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}
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}
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return '#' . implode('', $rgbcolors);
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}
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private function callback_five($matches)
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{
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return strtolower($matches[1]) . ':0' . $matches[2];
|
|
}
|
|
|
|
|
|
|
|
|
|
/* HELPERS
|
|
* ---------------------------------------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
|
|
/**
|
|
* PHP port of Javascript's "indexOf" function
|
|
* Author: Tubal Martin http://blog.margenn.com
|
|
*
|
|
* @param string $haystack
|
|
* @param string $needle
|
|
* @param int $offset index (optional)
|
|
*/
|
|
private function index_of($haystack, $needle, $offset = 0)
|
|
{
|
|
$index = strpos($haystack, $needle, $offset);
|
|
|
|
return ($index !== FALSE) ? $index : -1;
|
|
}
|
|
|
|
|
|
/**
|
|
* PHP port of Javascript's "substring" function
|
|
* Author: Tubal Martin http://blog.margenn.com
|
|
*
|
|
* @param string $str
|
|
* @param int $from index
|
|
* @param int $to index (optional)
|
|
*/
|
|
private function substring($str, $from, $to = FALSE)
|
|
{
|
|
if ($from < 0) {
|
|
$from = 0;
|
|
}
|
|
|
|
if ($to !== FALSE) {
|
|
|
|
if ($from === $to || $to < 0) {
|
|
return '';
|
|
}
|
|
|
|
if ($from > $to) {
|
|
$from_copy = $from;
|
|
$from = $to;
|
|
$to = $from_copy;
|
|
}
|
|
|
|
$substring = substr($str, $from, $to - $from);
|
|
return ($substring === FALSE) ? '' : $substring;
|
|
}
|
|
|
|
$substring = substr($str, $from);
|
|
return ($substring === FALSE) ? '' : $substring;
|
|
}
|
|
|
|
|
|
/**
|
|
* PHP port of Javascript's "slice" function
|
|
* Author: Tubal Martin http://blog.margenn.com
|
|
* Tests: http://margenn.com/tubal/str_slice/
|
|
*
|
|
* @param string $str
|
|
* @param int $start index
|
|
* @param int $end index (optional)
|
|
*/
|
|
private function str_slice($str, $start, $end = FALSE)
|
|
{
|
|
if ($start < 0 || $end <= 0) {
|
|
|
|
if ($end === FALSE) {
|
|
$slice = substr($str, $start);
|
|
return ($slice === FALSE) ? '' : $slice;
|
|
}
|
|
|
|
$max = strlen($str);
|
|
|
|
if ($start < 0) {
|
|
if (($start = $max + $start) < 0) {
|
|
return '';
|
|
}
|
|
}
|
|
|
|
if ($end < 0) {
|
|
if (($end = $max + $end) < 0) {
|
|
return '';
|
|
}
|
|
}
|
|
|
|
if ($end <= $start) {
|
|
return '';
|
|
}
|
|
}
|
|
|
|
$slice = substr($str, $start, $end - $start);
|
|
return ($slice === FALSE) ? '' : $slice;
|
|
}
|
|
|
|
|
|
} |