File: /var/www/html/wp-content/plugins/wp-asset-clean-up/classes/OptimiseAssets/CombineCssImports.php
<?php
/** @noinspection OffsetOperationsInspection */
/** @noinspection SlowArrayOperationsInLoopInspection */
namespace WpAssetCleanUp\OptimiseAssets;
if ( ! class_exists('\MatthiasMullieWpacu\Minify\Minify') ) {
require_once WPACU_PLUGIN_DIR . '/vendor/autoload.php';
}
/**
* Combine CSS Imports extended from CSS minifier
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @package Minify
* @author Matthias Mullie <minify@mullie.eu>
* @author Tijs Verkoyen <minify@verkoyen.eu>
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
* @license MIT License
*/
class CombineCssImports extends \MatthiasMullieWpacu\Minify\Minify
{
/**
* @var int maximum import size in kB
*/
protected $maxImportSize = 5;
/**
* @var string[] valid import extensions
* @noinspection PropertyCanBeStaticInspection
*/
protected $importExtensions = array(
'gif' => 'data:image/gif',
'png' => 'data:image/png',
'jpe' => 'data:image/jpeg',
'jpg' => 'data:image/jpeg',
'jpeg' => 'data:image/jpeg',
'svg' => 'data:image/svg+xml',
'woff' => 'data:application/x-font-woff',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'xbm' => 'image/x-xbitmap',
);
/**
* Set the maximum size if files to be imported.
*
* Files larger than this size (in kB) will not be imported into the CSS.
* Importing files into the CSS as data-uri will save you some connections,
* but we should only import relatively small decorative images so that our
* CSS file doesn't get too bulky.
*
* @param int $size Size in kB
*/
public function setMaxImportSize($size)
{
$this->maxImportSize = $size;
}
/**
* Set the type of extensions to be imported into the CSS (to save network
* connections).
* Keys of the array should be the file extensions & respective values
* should be the data type.
*
* @param string[] $extensions Array of file extensions
*/
public function setImportExtensions(array $extensions)
{
$this->importExtensions = $extensions;
}
/**
* Move any import statements to the top.
*
* @param string $content Nearly finished CSS content
*
* @return string
*/
protected function moveImportsToTop($content)
{
if (preg_match_all('/(;?)(@import (?<url>url\()?(?P<quotes>["\']?).+?(?P=quotes)(?(url)\)));?/', $content, $matches)) {
// remove from content
foreach ($matches[0] as $import) {
$content = str_replace($import, '', $content);
}
// add to top
$content = implode(';', $matches[2]).';'.trim($content, ';');
}
return $content;
}
/**
* Combine CSS from import statements.
*
* @import's will be loaded and their content merged into the original file,
* to save HTTP requests.
*
* @param string $source The file to combine imports for
* @param string $content The CSS content to combine imports for
* @param string[] $parents Parent paths, for circular reference checks
*
* @return string
*
*/
protected function combineImports($source, $content, $parents)
{
$importRegexes = array(
// @import url(xxx)
'/
# import statement
@import
# whitespace
\s+
# open url()
url\(
# (optional) open path enclosure
(?P<quotes>["\']?)
# fetch path
(?P<path>.+?)
# (optional) close path enclosure
(?P=quotes)
# close url()
\)
# (optional) trailing whitespace
\s*
# (optional) media statement(s)
(?P<media>[^;]*)
# (optional) trailing whitespace
\s*
# (optional) closing semi-colon
;?
/ix',
// @import 'xxx'
'/
# import statement
@import
# whitespace
\s+
# open path enclosure
(?P<quotes>["\'])
# fetch path
(?P<path>.+?)
# close path enclosure
(?P=quotes)
# (optional) trailing whitespace
\s*
# (optional) media statement(s)
(?P<media>[^;]*)
# (optional) trailing whitespace
\s*
# (optional) closing semi-colon
;?
/ix',
);
// find all relative imports in css
$matches = array();
foreach ($importRegexes as $importRegex) {
if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) {
$matches = array_merge($matches, $regexMatches);
}
}
$search = array();
$replace = array();
// loop the matches
foreach ($matches as $match) {
// get the path for the file that will be imported
$importPath = dirname($source).'/'.$match['path'];
// only replace the import with the content if we can grab the
// content of the file
if (!$this->canImportByPath($match['path']) || !$this->canImportFile($importPath)) {
continue;
}
// check if current file was not imported previously in the same
// import chain.
if (in_array($importPath, $parents)) {
// No need to have and endless loop (the same file imported again and again)
$search[] = $match[0];
$replace[] = '';
continue;
}
// grab referenced file & optimize it (which may include importing
// yet other @import statements recursively)
$minifier = new static($importPath);
$minifier->setMaxImportSize($this->maxImportSize);
$minifier->setImportExtensions($this->importExtensions);
$importContent = $minifier->execute($source, $parents);
// check if this is only valid for certain media
if (!empty($match['media'])) {
$importContent = '@media '.$match['media'].'{'.$importContent.'}';
}
// add to replacement array
$search[] = $match[0];
$replace[] = $importContent;
}
// replace the import statements
return str_replace($search, $replace, $content);
}
/**
* @param $css
*
* @return mixed
*/
protected function alterImportsBetweenComments($css)
{
// RegEx Source: https://blog.ostermiller.org/finding-comments-in-source-code-using-regular-expressions/
preg_match_all('#/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*+/#', $css, $commentsMatches);
if ( ! empty($commentsMatches[0]) ) {
foreach ($commentsMatches[0] as $commentMatch) {
if (stripos($commentMatch, '@import') === false) {
continue; // the comment needs to have @import
}
$newComment = str_ireplace('@import', '(wpacu)(at)import', $commentMatch);
$css = str_replace($commentMatch, $newComment, $css);
}
}
return $css;
}
/**
* Import files into the CSS, base64-sized.
*
* @url(image.jpg) images will be loaded and their content merged into the
* original file, to save HTTP requests.
*
* @param string $source The file to import files for
* @param string $content The CSS content to import files for
*
* @return string
*/
protected function importFiles($source, $content)
{
$regex = '/url\((["\']?)(.+?)\\1\)/i';
if ($this->importExtensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) {
$search = array();
$replace = array();
// loop the matches
foreach ($matches as $match) {
$extension = substr(strrchr($match[2], '.'), 1);
if ($extension && !array_key_exists($extension, $this->importExtensions)) {
continue;
}
// get the path for the file that will be imported
$path = $match[2];
$path = dirname($source).'/'.$path;
// only replace the import with the content if we're able to get
// the content of the file, and it's relatively small
if ($this->canImportFile($path) && $this->canImportBySize($path)) {
// grab content && base64-ize
$importContent = $this->load($path);
$importContent = base64_encode($importContent);
// build replacement
$search[] = $match[0];
$replace[] = 'url('.$this->importExtensions[$extension].';base64,'.$importContent.')';
}
}
// replace the import statements
$content = str_replace($search, $replace, $content);
}
return $content;
}
/**
* Perform CSS optimizations.
*
* @param string[optional] $path Path to write the data to
* @param string[] $parents Parent paths, for circular reference checks
*
* @return string The minified data
*/
public function execute($path = null, $parents = array())
{
$content = '';
// loop CSS data (raw data and files)
foreach ($this->data as $source => $css) {
// Some developers might have wrapped @import between comments
// No import for those
$css = $this->alterImportsBetweenComments($css);
$source = is_int($source) ? '' : $source;
$parents = $source ? array_merge($parents, array($source)) : $parents;
$css = $this->combineImports($source, $css, $parents);
$css = $this->importFiles($source, $css);
/*
* If we'll save to a new path, we'll have to fix the relative paths
* to be relative no longer to the source file, but to the new path.
* If we don't write to a file, fall back to same path so no
* conversion happens (because we still want it to go through most
* of the move code, which also addresses url() & @import syntax...)
*/
$converter = $this->getPathConverter($source, $path ?: $source);
$css = $this->move($converter, $css);
// combine css
$content .= $css;
}
$content = $this->moveImportsToTop($content);
return $content;
}
/**
* Moving a css file should update all relative urls.
* Relative references (e.g. ../images/image.gif) in a certain css file,
* will have to be updated when a file is being saved at another location
* (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper).
*
* @param \MatthiasMullieWpacu\PathConverter\ConverterInterface $converter Relative path converter
* @param string $content The CSS content to update relative urls for
*
* @return string
*/
protected function move(\MatthiasMullieWpacu\PathConverter\ConverterInterface $converter, $content)
{
/*
* Relative path references will usually be enclosed by url(). @import
* is an exception, where url() is not necessary around the path (but is
* allowed).
* This *could* be 1 regular expression, where both regular expressions
* in this array are on different sides of a |. But we're using named
* patterns in both regexes, the same name on both regexes. This is only
* possible with a (?J) modifier, but that only works after a fairly
* recent PCRE version. That's why I'm doing 2 separate regular
* expressions & combining the matches after executing of both.
*/
$relativeRegexes = array(
// url(xxx)
'/
# open url()
url\(
\s*
# open path enclosure
(?P<quotes>["\'])?
# fetch path
(?P<path>.+?)
# close path enclosure
(?(quotes)(?P=quotes))
\s*
# close url()
\)
/ix',
// @import "xxx"
'/
# import statement
@import
# whitespace
\s+
# we don\'t have to check for @import url(), because the
# condition above will already catch these
# open path enclosure
(?P<quotes>["\'])
# fetch path
(?P<path>.+?)
# close path enclosure
(?P=quotes)
/ix',
);
// find all relative urls in css
$matches = array();
foreach ($relativeRegexes as $relativeRegex) {
if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) {
$matches = array_merge($matches, $regexMatches);
}
}
$search = array();
$replace = array();
// loop all urls
foreach ($matches as $match) {
// determine if it's an url() or an @import match
$type = (strncmp($match[0], '@import', 7) === 0 ? 'import' : 'url');
$url = $match['path'];
if ($this->canImportByPath($url)) {
// attempting to interpret GET-params makes no sense, so let's discard them for a while
$params = strrchr($url, '?');
$url = $params ? substr($url, 0, -strlen($params)) : $url;
// fix relative url
$url = $converter->convert($url);
// now that the path has been converted, re-apply GET-params
$url .= $params;
}
/*
* Urls with control characters above 0x7e should be quoted.
* According to Mozilla's parser, whitespace is only allowed at the
* end of unquoted urls.
* Urls with `)` (as could happen with data: uris) should also be
* quoted to avoid being confused for the url() closing parentheses.
* And urls with a # have also been reported to cause issues.
* Urls with quotes inside should also remain escaped.
*
* @see https://developer.mozilla.org/nl/docs/Web/CSS/url#The_url()_functional_notation
* @see https://hg.mozilla.org/mozilla-central/rev/14abca4e7378
* @see https://github.com/matthiasmullie/minify/issues/193
*/
$url = trim($url);
if (preg_match('/[\s\)\'"#\x{7f}-\x{9f}]/u', $url)) {
$url = $match['quotes'] . $url . $match['quotes'];
}
// build replacement
$search[] = $match[0];
if ($type === 'url') {
$replace[] = 'url('.$url.')';
} elseif ($type === 'import') {
$replace[] = '@import "'.$url.'"';
}
}
// replace urls
return str_replace($search, $replace, $content);
}
/**
* Check if file is small enough to be imported.
*
* @param string $path The path to the file
*
* @return bool
*/
protected function canImportBySize($path)
{
return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024;
}
/**
* Check if file a file can be imported, going by the path.
*
* @param string $path
*
* @return bool
*/
protected function canImportByPath($path)
{
return preg_match('/^(data:|https?:|\\/)/', $path) === 0;
}
/**
* Return a converter to update relative paths to be relative to the new
* destination.
*
* @param string $source
* @param string $target
*
* @return \MatthiasMullieWpacu\PathConverter\Converter
*/
protected function getPathConverter($source, $target)
{
return new \MatthiasMullieWpacu\PathConverter\Converter($source, $target);
}
}