mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-11-29 11:23:54 +01:00
758 lines
30 KiB
PHP
758 lines
30 KiB
PHP
|
<?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', $css);
|
||
|
|
$css = preg_replace('/('. $token_tring .'\*\/)\s*[\n\r\f]+\s*/', '$1'.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$2', $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$2$3', $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$2$3$4', $css);
|
||
|
|
|
||
|
|
// Remove trailing .0 -> -9.0 to -9
|
||
|
|
$css = preg_replace('/((?<!\\\\)\:|\s)(\-?\d+)\.0([^\d])/S', '$1$2$3', $css);
|
||
|
|
|
||
|
|
// Replace 0 length numbers with 0
|
||
|
|
$css = preg_replace('/((?<!\\\\)\:|\s)\-?\.?0+([^\d])/S', '${1}0$2', $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', $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', $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;$2', $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}(;|\}| \!)/', ':0$1', $css);
|
||
|
|
|
||
|
|
// Fix for issue: #2528142
|
||
|
|
// Replace text-shadow:0; with text-shadow:0 0 0;
|
||
|
|
$css = preg_replace('/(text-shadow\:0)(;|\}| \!)/i', '$1 0 0$2', $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', '$1:0 0$2', $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', '$1:0$2', $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:$2'. self::QUERY_FRACTION .'$3)', $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', $matches[2]));
|
||
|
|
return 'calc('. self::TOKEN . (count($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\,\);\}]/', $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;
|
||
|
|
}
|
||
|
|
}
|