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New module 'Advanced CSS/JS Aggregation'

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Manuel Cillero 2017-07-26 12:56:34 +02:00
parent 4237e850bc
commit 17a2a7a42d
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sites/all/modules/advagg/advagg_css_compress/yui/CSSMin.inc Normal file
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<?php
/*!
* cssmin.php rev 91c5ea5
* Author: Tubal Martin - http://blog.margenn.com/
* Repo: https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port
*
* This is a PHP port of the Javascript 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) 2011 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
{
private $comments;
private $preserved_tokens;
/**
* @param bool $raisePhpSettingsLimits if true, raisePhpSettingLimits() will
* be called.
*/
public function __construct($raisePhpSettingsLimits = true)
{
if ($raisePhpSettingsLimits) {
$this->raisePhpSettingLimits();
}
}
/**
* Minify a string of CSS
* @param string $css
* @param int|bool $linebreak_pos
* @return string
*/
public function run($css, $linebreak_pos = FALSE)
{
$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;
}
$this->comments[] = $this->str_slice($css, $start_index + 2, $end_index);
$css = $this->str_slice($css, 0, $start_index + 2) . '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_' . (count($this->comments) - 1) . '___' . $this->str_slice($css, $end_index);
$start_index += 2;
}
// preserve strings so their content doesn't get accidentally minified
$css = preg_replace_callback('/(?:"(?:[^\\\\"]|\\\\.|\\\\)*")|'."(?:'(?:[^\\\\']|\\\\.|\\\\)*')/", array($this, 'callback_one'), $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], $linebreak_pos);
// If there is a @charset in a css chunk...
if (empty($charset) && preg_match($charset_regexp, $css_chunks[$i], $matches)) {
// delete all of them no matter the chunk
$css_chunks[$i] = preg_replace($charset_regexp, '', $css_chunks[$i]);
$charset = $matches[0];
}
}
// Update the first chunk and put the charset to the top of the file.
$css_chunks[0] = $charset . $css_chunks[0];
return implode('', $css_chunks);
}
/**
* Get the minimum PHP setting values suggested for CSSmin
* @return array
*/
public function getSuggestedPhpLimits()
{
return array(
'memory_limit' => '128M',
'pcre.backtrack_limit' => 1000 * 1000,
'pcre.recursion_limit' => 500 * 1000,
);
}
/**
* Configure PHP to use at least the suggested minimum settings
*
* @todo Move this functionality to separate class.
*/
public function raisePhpSettingLimits()
{
foreach ($this->getSuggestedPhpLimits() as $key => $val) {
$current = $this->normalizeInt(ini_get($key));
$suggested = $this->normalizeInt($val);
if ($current < $suggested) {
ini_set($key, $val);
}
}
}
/**
* 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 = '/___YUICSSMIN_PRESERVE_CANDIDATE_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;
$css = preg_replace($placeholder, '___YUICSSMIN_PRESERVED_TOKEN_' . (count($this->preserved_tokens) - 1) . '___', $css, 1);
continue;
}
// \ in the last position looks like hack for Mac/IE5
// shorten that to /*\*/ and the next one to /**/
if (substr($token, (strlen($token) - 1), 1) === '\\') {
$this->preserved_tokens[] = '\\';
$css = preg_replace($placeholder, '___YUICSSMIN_PRESERVED_TOKEN_' . (count($this->preserved_tokens) - 1) . '___', $css, 1);
$i = $i + 1; // attn: advancing the loop
$this->preserved_tokens[] = '';
$css = preg_replace('/___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_' . $i . '___/', '___YUICSSMIN_PRESERVED_TOKEN_' . (count($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, '___YUICSSMIN_PRESERVED_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);
// 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, 'callback_two'), $css);
$css = preg_replace('/\s+([\!\{\}\;\:\>\+\(\)\],])/', '$1', $css);
$css = preg_replace('/___YUICSSMIN_PSEUDOCLASSCOLON___/', ':', $css);
// retain space for special IE6 cases
$css = preg_replace('/\:first\-(line|letter)(\{|,)/', ':first-$1 $2', $css);
// no space after the end of a preserved comment
$css = preg_replace('/\*\/ /', '*/', $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+/', '$1', $css);
// remove unnecessary semicolons
$css = preg_replace('/;+\}/', '}', $css);
// Replace 0(px,em,%) with 0.
$css = preg_replace('/([\s\:])(0)(?:px|em|%|in|cm|mm|pc|pt|ex)/i', '$1$2', $css);
// Replace 0 0 0 0; with 0.
$css = preg_replace('/\:0 0 0 0(;|\})/', ':0$1', $css);
$css = preg_replace('/\:0 0 0(;|\})/', ':0$1', $css);
$css = preg_replace('/\:0 0(;|\})/', ':0$1', $css);
// Replace background-position:0; with background-position:0 0;
// same for transform-origin
$css = preg_replace_callback('/(background\-position|transform\-origin|webkit\-transform\-origin|moz\-transform\-origin|o-transform\-origin|ms\-transform\-origin)\:0(;|\})/i', array($this, 'callback_three'), $css);
// Replace 0.6 to .6, but only when preceded by : or a white-space
$css = preg_replace('/(\:|\s)0+\.(\d+)/', '$1.$2', $css);
// Shorten colors from rgb(51,102,153) to #336699
// This makes it more likely that it'll get further compressed in the next step.
$css = preg_replace_callback('/rgb\s*\(\s*([0-9,\s]+)\s*\)/i', array($this, 'callback_four'), $css);
// Shorten colors from #AABBCC to #ABC.
$css = $this->compress_hex_colors($css);
// border: none -> border:0
$css = preg_replace_callback('/(border|border\-top|border\-right|border\-bottom|border\-right|outline|background)\:none(;|\})/i', array($this, 'callback_five'), $css);
// shorter opacity IE filter
$css = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $css);
// Remove empty rules.
$css = preg_replace('/[^\};\{\/]+\{\}/', '', $css);
// Some source control tools don't like it when files containing lines longer
// than, say 8000 characters, are checked in. The linebreak option is used in
// that case to split long lines after a specific column.
if ($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('/;;+/', ';', $css);
// restore preserved comments and strings
for ($i = 0, $max = count($this->preserved_tokens); $i < $max; $i++) {
$css = preg_replace('/___YUICSSMIN_PRESERVED_TOKEN_' . $i . '___/', $this->preserved_tokens[$i], $css, 1);
}
// Trim the final string (for any leading or trailing white spaces)
$css = preg_replace('/^\s+|\s+$/', '', $css);
return $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\:/';
// 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[] = $this->substring($css, $append_index, $index);
if ($found_terminator) {
$token = $this->substring($css, $start_index, $end_index);
$token = preg_replace('/\s+/', '', $token);
$this->preserved_tokens[] = $token;
$preserver = 'url(___YUICSSMIN_PRESERVED_TOKEN_' . (count($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[] = $this->substring($css, $index, $last_index);
$append_index = $last_index;
}
$offset = $last_index;
}
$sb[] = $this->substring($css, $append_index);
return implode('', $sb);
}
/**
* Utility method to compress hex color values of the form #AABBCC to #ABC.
*
* 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{][^{]*?\})/i';
$_index = $index = $last_index = $offset = 0;
$sb = array();
while (preg_match($pattern, $css, $m, 0, $offset)) {
$index = $this->index_of($css, $m[0], $offset);
$last_index = $index + strlen($m[0]);
$is_filter = (bool) $m[1];
$sb[] = $this->substring($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.
$sb[] = '#' . strtolower($m[3] . $m[5] . $m[7]);
} else {
// Non compressible color, restore but lower case.
$sb[] = '#' . strtolower($m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]);
}
}
$_index = $offset = $last_index - strlen($m[8]);
}
$sb[] = $this->substring($css, $_index);
return implode('', $sb);
}
/* CALLBACKS
* ---------------------------------------------------------------------------------------------
*/
private function callback_one($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, '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_')) >= 0) {
for ($i = 0, $max = count($this->comments); $i < $max; $i++) {
$match = preg_replace('/___YUICSSMIN_PRESERVE_CANDIDATE_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 $quote . '___YUICSSMIN_PRESERVED_TOKEN_' . (count($this->preserved_tokens) - 1) . '___' . $quote;
}
private function callback_two($matches)
{
return preg_replace('/\:/', '___YUICSSMIN_PSEUDOCLASSCOLON___', $matches[0]);
}
private function callback_three($matches)
{
return strtolower($matches[1]) . ':0 0' . $matches[2];
}
private function callback_four($matches)
{
$rgbcolors = explode(',', $matches[1]);
for ($i = 0; $i < count($rgbcolors); $i++) {
$rgbcolors[$i] = base_convert(strval(intval($rgbcolors[$i], 10)), 10, 16);
if (strlen($rgbcolors[$i]) === 1) {
$rgbcolors[$i] = '0' . $rgbcolors[$i];
}
}
return '#' . implode('', $rgbcolors);
}
private function callback_five($matches)
{
return strtolower($matches[1]) . ':0' . $matches[2];
}
/* HELPERS
* ---------------------------------------------------------------------------------------------
*/
/**
* 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 "substring" function
* Author: Tubal Martin http://blog.margenn.com
* Tests: http://margenn.com/tubal/substring/
*
* @param string $str
* @param int $from index
* @param int|bool $to index (optional)
* @return string
*/
private function substring($str, $from = 0, $to = FALSE)
{
if ($to !== FALSE) {
if ($from == $to || ($from <= 0 && $to < 0)) {
return '';
}
if ($from > $to) {
$from_copy = $from;
$from = $to;
$to = $from_copy;
}
}
if ($from < 0) {
$from = 0;
}
$substring = ($to === FALSE) ? substr($str, $from) : substr($str, $from, $to - $from);
return ($substring === FALSE) ? '' : $substring;
}
/**
* 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" to int values
* @param mixed $size
* @return int
*/
private function normalizeInt($size)
{
if (is_string($size)) {
switch (substr($size, -1)) {
case 'M': case 'm': return (int)$size * 1048576;
case 'K': case 'k': return (int)$size * 1024;
case 'G': case 'g': return (int)$size * 1073741824;
default: return (int) $size;
}
}
return (int) $size;
}
}

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<?php
/**
* Class Minify_CSS_Compressor
* @package Minify
*/
/**
* Compress CSS
*
* This is a heavy regex-based removal of whitespace, unnecessary
* comments and tokens, and some CSS value minimization, where practical.
* Many steps have been taken to avoid breaking comment-based hacks,
* including the ie5/mac filter (and its inversion), but expect tricky
* hacks involving comment tokens in 'content' value strings to break
* minimization badly. A test suite is available.
*
* @package Minify
* @author Stephen Clay <steve@mrclay.org>
* @author http://code.google.com/u/1stvamp/ (Issue 64 patch)
*/
class Minify_CSS_Compressor {
/**
* Minify a CSS string
*
* @param string $css
*
* @param array $options (currently ignored)
*
* @return string
*/
public static function process($css, $options = array())
{
$obj = new Minify_CSS_Compressor($options);
return $obj->_process($css);
}
/**
* @var array
*/
protected $_options = null;
/**
* Are we "in" a hack? I.e. are some browsers targetted until the next comment?
*
* @var bool
*/
protected $_inHack = false;
/**
* Constructor
*
* @param array $options (currently ignored)
*/
private function __construct($options) {
$this->_options = $options;
}
/**
* Minify a CSS string
*
* @param string $css
*
* @return string
*/
protected function _process($css)
{
$css = str_replace("\r\n", "\n", $css);
// preserve empty comment after '>'
// http://www.webdevout.net/css-hacks#in_css-selectors
$css = preg_replace('@>/\\*\\s*\\*/@', '>/*keep*/', $css);
// preserve empty comment between property and value
// http://css-discuss.incutio.com/?page=BoxModelHack
$css = preg_replace('@/\\*\\s*\\*/\\s*:@', '/*keep*/:', $css);
$css = preg_replace('@:\\s*/\\*\\s*\\*/@', ':/*keep*/', $css);
// apply callback to all valid comments (and strip out surrounding ws
$css = preg_replace_callback('@\\s*/\\*([\\s\\S]*?)\\*/\\s*@'
,array($this, '_commentCB'), $css);
// remove ws around { } and last semicolon in declaration block
$css = preg_replace('/\\s*{\\s*/', '{', $css);
$css = preg_replace('/;?\\s*}\\s*/', '}', $css);
// remove ws surrounding semicolons
$css = preg_replace('/\\s*;\\s*/', ';', $css);
// remove ws around urls
$css = preg_replace('/
url\\( # url(
\\s*
([^\\)]+?) # 1 = the URL (really just a bunch of non right parenthesis)
\\s*
\\) # )
/x', 'url($1)', $css);
// remove ws between rules and colons
$css = preg_replace('/
\\s*
([{;]) # 1 = beginning of block or rule separator
\\s*
([\\*_]?[\\w\\-]+) # 2 = property (and maybe IE filter)
\\s*
:
\\s*
(\\b|[#\'"-]) # 3 = first character of a value
/x', '$1$2:$3', $css);
// remove ws in selectors
$css = preg_replace_callback('/
(?: # non-capture
\\s*
[^~>+,\\s]+ # selector part
\\s*
[,>+~] # combinators
)+
\\s*
[^~>+,\\s]+ # selector part
{ # open declaration block
/x'
,array($this, '_selectorsCB'), $css);
// minimize hex colors
$css = preg_replace('/([^=])#([a-f\\d])\\2([a-f\\d])\\3([a-f\\d])\\4([\\s;\\}])/i'
, '$1#$2$3$4$5', $css);
// remove spaces between font families
$css = preg_replace_callback('/font-family:([^;}]+)([;}])/'
,array($this, '_fontFamilyCB'), $css);
$css = preg_replace('/@import\\s+url/', '@import url', $css);
// replace any ws involving newlines with a single newline
$css = preg_replace('/[ \\t]*\\n+\\s*/', "\n", $css);
// separate common descendent selectors w/ newlines (to limit line lengths)
$css = preg_replace('/([\\w#\\.\\*]+)\\s+([\\w#\\.\\*]+){/', "$1\n$2{", $css);
// Use newline after 1st numeric value (to limit line lengths).
$css = preg_replace('/
((?:padding|margin|border|outline):\\d+(?:px|em)?) # 1 = prop : 1st numeric value
\\s+
/x'
,"$1\n", $css);
// prevent triggering IE6 bug: http://www.crankygeek.com/ie6pebug/
$css = preg_replace('/:first-l(etter|ine)\\{/', ':first-l$1 {', $css);
return trim($css);
}
/**
* Replace what looks like a set of selectors
*
* @param array $m regex matches
*
* @return string
*/
protected function _selectorsCB($m)
{
// remove ws around the combinators
return preg_replace('/\\s*([,>+~])\\s*/', '$1', $m[0]);
}
/**
* Process a comment and return a replacement
*
* @param array $m regex matches
*
* @return string
*/
protected function _commentCB($m)
{
$hasSurroundingWs = (trim($m[0]) !== $m[1]);
$m = $m[1];
// $m is the comment content w/o the surrounding tokens,
// but the return value will replace the entire comment.
if ($m === 'keep') {
return '/**/';
}
if ($m === '" "') {
// component of http://tantek.com/CSS/Examples/midpass.html
return '/*" "*/';
}
if (preg_match('@";\\}\\s*\\}/\\*\\s+@', $m)) {
// component of http://tantek.com/CSS/Examples/midpass.html
return '/*";}}/* */';
}
if ($this->_inHack) {
// inversion: feeding only to one browser
if (preg_match('@
^/ # comment started like /*/
\\s*
(\\S[\\s\\S]+?) # has at least some non-ws content
\\s*
/\\* # ends like /*/ or /**/
@x', $m, $n)) {
// end hack mode after this comment, but preserve the hack and comment content
$this->_inHack = false;
return "/*/{$n[1]}/**/";
}
}
if (substr($m, -1) === '\\') { // comment ends like \*/
// begin hack mode and preserve hack
$this->_inHack = true;
return '/*\\*/';
}
if ($m !== '' && $m[0] === '/') { // comment looks like /*/ foo */
// begin hack mode and preserve hack
$this->_inHack = true;
return '/*/*/';
}
if ($this->_inHack) {
// a regular comment ends hack mode but should be preserved
$this->_inHack = false;
return '/**/';
}
// Issue 107: if there's any surrounding whitespace, it may be important, so
// replace the comment with a single space
return $hasSurroundingWs // remove all other comments
? ' '
: '';
}
/**
* Process a font-family listing and return a replacement
*
* @param array $m regex matches
*
* @return string
*/
protected function _fontFamilyCB($m)
{
// Issue 210: must not eliminate WS between words in unquoted families
$pieces = preg_split('/(\'[^\']+\'|"[^"]+")/', $m[1], null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
$out = 'font-family:';
while (null !== ($piece = array_shift($pieces))) {
if ($piece[0] !== '"' && $piece[0] !== "'") {
$piece = preg_replace('/\\s+/', ' ', $piece);
$piece = preg_replace('/\\s?,\\s?/', ',', $piece);
}
$out .= $piece;
}
return $out . $m[2];
}
}