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%PDF-
Mini Shell
Mini Shell
<?php
/*
* This file is part of the Assetic package, an OpenSky project.
*
* (c) 2010-2014 OpenSky Project Inc
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Assetic\Util;
/**
* CSS Utils.
*
* @author Kris Wallsmith <kris.wallsmith@gmail.com>
*/
abstract class CssUtils
{
const REGEX_URLS = '/url\((["\']?)(?P<url>.*?)(\\1)\)/';
const REGEX_IMPORTS = '/@import (?:url\()?(\'|"|)(?P<url>[^\'"\)\n\r]*)\1\)?;?/';
const REGEX_IMPORTS_NO_URLS = '/@import (?!url\()(\'|"|)(?P<url>[^\'"\)\n\r]*)\1;?/';
const REGEX_IE_FILTERS = '/src=(["\']?)(?P<url>.*?)\\1/';
const REGEX_COMMENTS = '/(\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)/';
/**
* Filters all references -- url() and "@import" -- through a callable.
*
* @param string $content The CSS
* @param callable $callback A PHP callable
*
* @return string The filtered CSS
*/
public static function filterReferences($content, $callback)
{
$content = static::filterUrls($content, $callback);
$content = static::filterImports($content, $callback, false);
$content = static::filterIEFilters($content, $callback);
return $content;
}
/**
* Filters all CSS url()'s through a callable.
*
* @param string $content The CSS
* @param callable $callback A PHP callable
*
* @return string The filtered CSS
*/
public static function filterUrls($content, $callback)
{
$pattern = static::REGEX_URLS;
return static::filterCommentless($content, function ($part) use (& $callback,$pattern) {
return preg_replace_callback($pattern, $callback, $part);
});
}
/**
* Filters all CSS imports through a callable.
*
* @param string $content The CSS
* @param callable $callback A PHP callable
* @param Boolean $includeUrl Whether to include url() in the pattern
*
* @return string The filtered CSS
*/
public static function filterImports($content, $callback, $includeUrl = true)
{
$pattern = $includeUrl ? static::REGEX_IMPORTS : static::REGEX_IMPORTS_NO_URLS;
return static::filterCommentless($content, function ($part) use (& $callback,$pattern) {
return preg_replace_callback($pattern, $callback, $part);
});
}
/**
* Filters all IE filters (AlphaImageLoader filter) through a callable.
*
* @param string $content The CSS
* @param callable $callback A PHP callable
*
* @return string The filtered CSS
*/
public static function filterIEFilters($content, $callback)
{
$pattern = static::REGEX_IE_FILTERS;
return static::filterCommentless($content, function ($part) use (& $callback, $pattern) {
return preg_replace_callback($pattern, $callback, $part);
});
}
/**
* Filters each non-comment part through a callable.
*
* @param string $content The CSS
* @param callable $callback A PHP callable
*
* @return string The filtered CSS
*/
public static function filterCommentless($content, $callback)
{
$result = '';
foreach (preg_split(static::REGEX_COMMENTS, $content, -1, PREG_SPLIT_DELIM_CAPTURE) as $part) {
if (!preg_match(static::REGEX_COMMENTS, $part, $match) || $part != $match[0]) {
$part = call_user_func($callback, $part);
}
$result .= $part;
}
return $result;
}
/**
* Extracts all references from the supplied CSS content.
*
* @param string $content The CSS content
*
* @return array An array of unique URLs
*/
public static function extractImports($content)
{
$imports = array();
static::filterImports($content, function ($matches) use (&$imports) {
$imports[] = $matches['url'];
});
return array_unique($imports);
}
final private function __construct()
{
}
}
Zerion Mini Shell 1.0