755 lines
27 KiB
PHP
755 lines
27 KiB
PHP
<?php
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/**
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* CSS Minifier.
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*
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* Please report bugs on https://github.com/matthiasmullie/minify/issues
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*
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* @author Matthias Mullie <minify@mullie.eu>
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* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
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* @license MIT License
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*/
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namespace VDM\Minify;
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use VDM\Minify\Exceptions\FileImportException;
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use VDM\Minify\Path\Converter;
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use VDM\Minify\Path\Interfaces\ConverterInterface;
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use VDM\Minify\Abstraction\Minify;
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/**
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* CSS minifier.
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*
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* Please report bugs on https://github.com/matthiasmullie/minify/issues
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*
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* @author Matthias Mullie
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* @author Tijs Verkoyen
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* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
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* @license MIT License
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*/
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class Css extends Minify
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{
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/**
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* @var int maximum inport size in kB
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*/
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protected $maxImportSize = 5;
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/**
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* @var string[] valid import extensions
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*/
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protected $importExtensions = array(
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'gif' => 'data:image/gif',
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'png' => 'data:image/png',
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'jpe' => 'data:image/jpeg',
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'jpg' => 'data:image/jpeg',
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'jpeg' => 'data:image/jpeg',
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'svg' => 'data:image/svg+xml',
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'woff' => 'data:application/x-font-woff',
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'woff2' => 'data:application/x-font-woff2',
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'avif' => 'data:image/avif',
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'apng' => 'data:image/apng',
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'webp' => 'data:image/webp',
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'tif' => 'image/tiff',
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'tiff' => 'image/tiff',
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'xbm' => 'image/x-xbitmap',
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);
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/**
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* Set the maximum size if files to be imported.
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*
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* Files larger than this size (in kB) will not be imported into the CSS.
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* Importing files into the CSS as data-uri will save you some connections,
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* but we should only import relatively small decorative images so that our
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* CSS file doesn't get too bulky.
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*
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* @param int $size Size in kB
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*/
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public function setMaxImportSize($size)
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{
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$this->maxImportSize = $size;
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}
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/**
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* Set the type of extensions to be imported into the CSS (to save network
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* connections).
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* Keys of the array should be the file extensions & respective values
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* should be the data type.
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*
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* @param string[] $extensions Array of file extensions
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*/
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public function setImportExtensions(array $extensions)
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{
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$this->importExtensions = $extensions;
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}
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/**
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* Move any import statements to the top.
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*
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* @param string $content Nearly finished CSS content
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*
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* @return string
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*/
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protected function moveImportsToTop($content)
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{
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if (preg_match_all('/(;?)(@import (?<url>url\()?(?P<quotes>["\']?).+?(?P=quotes)(?(url)\)));?/', $content, $matches)) {
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// remove from content
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foreach ($matches[0] as $import) {
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$content = str_replace($import, '', $content);
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}
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// add to top
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$content = implode(';', $matches[2]) . ';' . trim($content, ';');
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}
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return $content;
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}
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/**
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* Combine CSS from import statements.
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*
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* Import statements will be loaded and their content merged into the original
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* file, to save HTTP requests.
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*
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* @param string $source The file to combine imports for
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* @param string $content The CSS content to combine imports for
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* @param string[] $parents Parent paths, for circular reference checks
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*
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* @return string
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*
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* @throws FileImportException
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*/
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protected function combineImports($source, $content, $parents)
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{
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$importRegexes = array(
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// @import url(xxx)
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'/
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# import statement
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@import
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# whitespace
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\s+
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# open url()
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url\(
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# (optional) open path enclosure
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(?P<quotes>["\']?)
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# fetch path
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(?P<path>.+?)
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# (optional) close path enclosure
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(?P=quotes)
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# close url()
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\)
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# (optional) trailing whitespace
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\s*
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# (optional) media statement(s)
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(?P<media>[^;]*)
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# (optional) trailing whitespace
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\s*
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# (optional) closing semi-colon
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;?
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/ix',
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// @import 'xxx'
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'/
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# import statement
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@import
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# whitespace
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\s+
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# open path enclosure
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(?P<quotes>["\'])
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# fetch path
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(?P<path>.+?)
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# close path enclosure
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(?P=quotes)
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# (optional) trailing whitespace
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\s*
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# (optional) media statement(s)
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(?P<media>[^;]*)
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# (optional) trailing whitespace
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\s*
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# (optional) closing semi-colon
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;?
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/ix',
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);
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// find all relative imports in css
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$matches = [];
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foreach ($importRegexes as $importRegex) {
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if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) {
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$matches = [...$matches, ...$regexMatches];
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}
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}
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$search = [];
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$replace = [];
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// loop the matches
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foreach ($matches as $match) {
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// get the path for the file that will be imported
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$importPath = dirname($source) . '/' . $match['path'];
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// only replace the import with the content if we can grab the
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// content of the file
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if (!$this->canImportByPath($match['path']) || !$this->canImportFile($importPath)) {
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continue;
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}
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// check if current file was not imported previously in the same
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// import chain.
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if (in_array($importPath, $parents)) {
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throw new FileImportException('Failed to import file "' . $importPath . '": circular reference detected.');
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}
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// grab referenced file & minify it (which may include importing
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// yet other @import statements recursively)
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$minifier = new self($importPath);
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$minifier->setMaxImportSize($this->maxImportSize);
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$minifier->setImportExtensions($this->importExtensions);
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$importContent = $minifier->execute($source, $parents);
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// check if this is only valid for certain media
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if (!empty($match['media'])) {
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$importContent = '@media ' . $match['media'] . '{' . $importContent . '}';
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}
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// add to replacement array
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$search[] = $match[0];
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$replace[] = $importContent;
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}
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// replace the import statements
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return str_replace($search, $replace, $content);
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}
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/**
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* Import files into the CSS, base64-ized.
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*
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* @url(image.jpg) images will be loaded and their content merged into the
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* original file, to save HTTP requests.
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*
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* @param string $source The file to import files for
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* @param string $content The CSS content to import files for
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*
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* @return string
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*/
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protected function importFiles($source, $content)
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{
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$regex = '/url\((["\']?)(.+?)\\1\)/i';
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if ($this->importExtensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) {
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$search = [];
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$replace = [];
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// loop the matches
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foreach ($matches as $match) {
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$extension = substr(strrchr($match[2], '.'), 1);
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if ($extension && !array_key_exists($extension, $this->importExtensions)) {
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continue;
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}
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// get the path for the file that will be imported
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$path = $match[2];
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$path = dirname($source) . '/' . $path;
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// only replace the import with the content if we're able to get
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// the content of the file, and it's relatively small
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if ($this->canImportFile($path) && $this->canImportBySize($path)) {
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// grab content && base64-ize
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$importContent = $this->load($path);
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$importContent = base64_encode($importContent);
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// build replacement
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$search[] = $match[0];
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$replace[] = 'url(' . $this->importExtensions[$extension] . ';base64,' . $importContent . ')';
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}
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}
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// replace the import statements
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$content = str_replace($search, $replace, $content);
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}
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return $content;
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}
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/**
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* Minify the data.
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* Perform CSS optimizations.
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*
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* @param string[optional] $path Path to write the data to
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* @param string[] $parents Parent paths, for circular reference checks
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*
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* @return string The minified data
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*/
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public function execute($path = null, $parents = [])
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{
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$content = '';
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// loop CSS data (raw data and files)
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foreach ($this->data as $source => $css) {
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/*
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* Let's first take out strings & comments, since we can't just
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* remove whitespace anywhere. If whitespace occurs inside a string,
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* we should leave it alone. E.g.:
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* p { content: "a test" }
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*/
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$this->extractStrings();
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$this->stripComments();
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$this->extractMath();
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$this->extractCustomProperties();
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$css = $this->replace($css);
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$css = $this->stripWhitespace($css);
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$css = $this->shortenColors($css);
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$css = $this->shortenZeroes($css);
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$css = $this->shortenFontWeights($css);
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$css = $this->stripEmptyTags($css);
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// restore the string we've extracted earlier
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$css = $this->restoreExtractedData($css);
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$source = is_int($source) ? '' : $source;
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$parents = $source ? array_merge($parents, array($source)) : $parents;
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$css = $this->combineImports($source, $css, $parents);
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$css = $this->importFiles($source, $css);
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/*
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* If we'll save to a new path, we'll have to fix the relative paths
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* to be relative no longer to the source file, but to the new path.
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* If we don't write to a file, fall back to same path so no
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* conversion happens (because we still want it to go through most
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* of the move code, which also addresses url() & @import syntax...)
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*/
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$converter = $this->getPathConverter($source, $path ?: $source);
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$css = $this->move($converter, $css);
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// combine css
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$content .= $css;
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}
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$content = $this->moveImportsToTop($content);
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return $content;
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}
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/**
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* Moving a css file should update all relative urls.
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* Relative references (e.g. ../images/image.gif) in a certain css file,
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* will have to be updated when a file is being saved at another location
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* (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper).
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*
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* @param ConverterInterface $converter Relative path converter
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* @param string $content The CSS content to update relative urls for
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*
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* @return string
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*/
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protected function move(ConverterInterface $converter, $content)
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{
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/*
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* Relative path references will usually be enclosed by url(). @import
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* is an exception, where url() is not necessary around the path (but is
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* allowed).
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* This *could* be 1 regular expression, where both regular expressions
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* in this array are on different sides of a |. But we're using named
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* patterns in both regexes, the same name on both regexes. This is only
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* possible with a (?J) modifier, but that only works after a fairly
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* recent PCRE version. That's why I'm doing 2 separate regular
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* expressions & combining the matches after executing of both.
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*/
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$relativeRegexes = array(
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// url(xxx)
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'/
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# open url()
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url\(
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\s*
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# open path enclosure
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(?P<quotes>["\'])?
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# fetch path
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(?P<path>.+?)
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# close path enclosure
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(?(quotes)(?P=quotes))
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\s*
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# close url()
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\)
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/ix',
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// @import "xxx"
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'/
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# import statement
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@import
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# whitespace
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\s+
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# we don\'t have to check for @import url(), because the
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# condition above will already catch these
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# open path enclosure
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(?P<quotes>["\'])
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# fetch path
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(?P<path>.+?)
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# close path enclosure
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(?P=quotes)
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/ix',
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);
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// find all relative urls in css
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$matches = [];
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foreach ($relativeRegexes as $relativeRegex) {
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if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) {
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$matches = [...$matches, ...$regexMatches];
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}
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}
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$search = [];
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$replace = [];
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// loop all urls
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foreach ($matches as $match) {
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// determine if it's a url() or an @import match
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$type = (strpos($match[0], '@import') === 0 ? 'import' : 'url');
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$url = $match['path'];
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if ($this->canImportByPath($url)) {
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// attempting to interpret GET-params makes no sense, so let's discard them for awhile
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$params = strrchr($url, '?');
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$url = $params ? substr($url, 0, -strlen($params)) : $url;
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// fix relative url
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$url = $converter->convert($url);
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// now that the path has been converted, re-apply GET-params
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$url .= $params;
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}
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/*
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* Urls with control characters above 0x7e should be quoted.
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* According to Mozilla's parser, whitespace is only allowed at the
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* end of unquoted urls.
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* Urls with `)` (as could happen with data: uris) should also be
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* quoted to avoid being confused for the url() closing parentheses.
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* And urls with a # have also been reported to cause issues.
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* Urls with quotes inside should also remain escaped.
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*
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* @see https://developer.mozilla.org/nl/docs/Web/CSS/url#The_url()_functional_notation
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* @see https://hg.mozilla.org/mozilla-central/rev/14abca4e7378
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* @see https://github.com/matthiasmullie/minify/issues/193
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*/
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$url = trim($url);
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if (preg_match('/[\s\)\'"#\x{7f}-\x{9f}]/u', $url)) {
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$url = $match['quotes'] . $url . $match['quotes'];
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}
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// build replacement
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$search[] = $match[0];
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if ($type === 'url') {
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$replace[] = 'url(' . $url . ')';
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} elseif ($type === 'import') {
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$replace[] = '@import "' . $url . '"';
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}
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}
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// replace urls
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return str_replace($search, $replace, $content);
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}
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/**
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* Shorthand hex color codes.
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* #FF0000 -> #F00.
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*
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* @param string $content The CSS content to shorten the hex color codes for
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*
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* @return string
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*/
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protected function shortenColors($content)
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{
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$content = preg_replace('/(?<=[: ])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?:([0-9a-z])\\4)?(?=[; }])/i', '#$1$2$3$4', $content);
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// remove alpha channel if it's pointless...
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$content = preg_replace('/(?<=[: ])#([0-9a-z]{6})ff?(?=[; }])/i', '#$1', $content);
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$content = preg_replace('/(?<=[: ])#([0-9a-z]{3})f?(?=[; }])/i', '#$1', $content);
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$colors = array(
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// we can shorten some even more by replacing them with their color name
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'#F0FFFF' => 'azure',
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'#F5F5DC' => 'beige',
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'#A52A2A' => 'brown',
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'#FF7F50' => 'coral',
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'#FFD700' => 'gold',
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'#808080' => 'gray',
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'#008000' => 'green',
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'#4B0082' => 'indigo',
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'#FFFFF0' => 'ivory',
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'#F0E68C' => 'khaki',
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'#FAF0E6' => 'linen',
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'#800000' => 'maroon',
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'#000080' => 'navy',
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'#808000' => 'olive',
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'#CD853F' => 'peru',
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'#FFC0CB' => 'pink',
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'#DDA0DD' => 'plum',
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'#800080' => 'purple',
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'#F00' => 'red',
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'#FA8072' => 'salmon',
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'#A0522D' => 'sienna',
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'#C0C0C0' => 'silver',
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'#FFFAFA' => 'snow',
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'#D2B48C' => 'tan',
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'#FF6347' => 'tomato',
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'#EE82EE' => 'violet',
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'#F5DEB3' => 'wheat',
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// or the other way around
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'WHITE' => '#fff',
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'BLACK' => '#000',
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);
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return preg_replace_callback(
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'/(?<=[: ])(' . implode('|', array_keys($colors)) . ')(?=[; }])/i',
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fn($match) => $colors[strtoupper((string) $match[0])],
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$content
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);
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}
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/**
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* Shorten CSS font weights.
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*
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* @param string $content The CSS content to shorten the font weights for
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*
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* @return string
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*/
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protected function shortenFontWeights($content)
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{
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$weights = array(
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'normal' => 400,
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'bold' => 700,
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);
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$callback = fn($match) => $match[1] . $weights[$match[2]];
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return preg_replace_callback('/(font-weight\s*:\s*)(' . implode('|', array_keys($weights)) . ')(?=[;}])/', $callback, $content);
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}
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/**
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* Shorthand 0 values to plain 0, instead of e.g. -0em.
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*
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* @param string $content The CSS content to shorten the zero values for
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|
*
|
|
* @return string
|
|
*/
|
|
protected function shortenZeroes($content)
|
|
{
|
|
// we don't want to strip units in `calc()` expressions:
|
|
// `5px - 0px` is valid, but `5px - 0` is not
|
|
// `10px * 0` is valid (equates to 0), and so is `10 * 0px`, but
|
|
// `10 * 0` is invalid
|
|
// we've extracted calcs earlier, so we don't need to worry about this
|
|
|
|
// reusable bits of code throughout these regexes:
|
|
// before & after are used to make sure we don't match lose unintended
|
|
// 0-like values (e.g. in #000, or in http://url/1.0)
|
|
// units can be stripped from 0 values, or used to recognize non 0
|
|
// values (where wa may be able to strip a .0 suffix)
|
|
$before = '(?<=[:(, ])';
|
|
$after = '(?=[ ,);}])';
|
|
$units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)';
|
|
|
|
// strip units after zeroes (0px -> 0)
|
|
// NOTE: it should be safe to remove all units for a 0 value, but in
|
|
// practice, Webkit (especially Safari) seems to stumble over at least
|
|
// 0%, potentially other units as well. Only stripping 'px' for now.
|
|
// @see https://github.com/matthiasmullie/minify/issues/60
|
|
$content = preg_replace('/' . $before . '(-?0*(\.0+)?)(?<=0)px' . $after . '/', '\\1', $content);
|
|
|
|
// strip 0-digits (.0 -> 0)
|
|
$content = preg_replace('/' . $before . '\.0+' . $units . '?' . $after . '/', '0\\1', $content);
|
|
// strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px
|
|
$content = preg_replace('/' . $before . '(-?[0-9]+\.[0-9]+)0+' . $units . '?' . $after . '/', '\\1\\2', $content);
|
|
// strip trailing 0: 50.00 -> 50, 50.00px -> 50px
|
|
$content = preg_replace('/' . $before . '(-?[0-9]+)\.0+' . $units . '?' . $after . '/', '\\1\\2', $content);
|
|
// strip leading 0: 0.1 -> .1, 01.1 -> 1.1
|
|
$content = preg_replace('/' . $before . '(-?)0+([0-9]*\.[0-9]+)' . $units . '?' . $after . '/', '\\1\\2\\3', $content);
|
|
|
|
// strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0)
|
|
$content = preg_replace('/' . $before . '-?0+' . $units . '?' . $after . '/', '0\\1', $content);
|
|
|
|
// IE doesn't seem to understand a unitless flex-basis value (correct -
|
|
// it goes against the spec), so let's add it in again (make it `%`,
|
|
// which is only 1 char: 0%, 0px, 0 anything, it's all just the same)
|
|
// @see https://developer.mozilla.org/nl/docs/Web/CSS/flex
|
|
$content = preg_replace('/flex:([0-9]+\s[0-9]+\s)0([;\}])/', 'flex:${1}0%${2}', $content);
|
|
$content = preg_replace('/flex-basis:0([;\}])/', 'flex-basis:0%${1}', $content);
|
|
|
|
return $content;
|
|
}
|
|
|
|
/**
|
|
* Strip empty tags from source code.
|
|
*
|
|
* @param string $content
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function stripEmptyTags($content)
|
|
{
|
|
$content = preg_replace('/(?<=^)[^\{\};]+\{\s*\}/', '', $content);
|
|
$content = preg_replace('/(?<=(\}|;))[^\{\};]+\{\s*\}/', '', $content);
|
|
|
|
return $content;
|
|
}
|
|
|
|
/**
|
|
* Strip comments from source code.
|
|
*/
|
|
protected function stripComments()
|
|
{
|
|
// PHP only supports $this inside anonymous functions since 5.4
|
|
$minifier = $this;
|
|
$callback = function ($match) use ($minifier) {
|
|
$count = count($minifier->extracted);
|
|
$placeholder = '/*' . $count . '*/';
|
|
$minifier->extracted[$placeholder] = $match[0];
|
|
|
|
return $placeholder;
|
|
};
|
|
$this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback);
|
|
|
|
$this->registerPattern('/\/\*.*?\*\//s', '');
|
|
}
|
|
|
|
/**
|
|
* Strip whitespace.
|
|
*
|
|
* @param string $content The CSS content to strip the whitespace for
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function stripWhitespace($content)
|
|
{
|
|
// remove leading & trailing whitespace
|
|
$content = preg_replace('/^\s*/m', '', $content);
|
|
$content = preg_replace('/\s*$/m', '', $content);
|
|
|
|
// replace newlines with a single space
|
|
$content = preg_replace('/\s+/', ' ', $content);
|
|
|
|
// remove whitespace around meta characters
|
|
// inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex
|
|
$content = preg_replace('/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content);
|
|
$content = preg_replace('/([\[(:>\+])\s+/', '$1', $content);
|
|
$content = preg_replace('/\s+([\]\)>\+])/', '$1', $content);
|
|
$content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content);
|
|
|
|
// whitespace around + and - can only be stripped inside some pseudo-
|
|
// classes, like `:nth-child(3+2n)`
|
|
// not in things like `calc(3px + 2px)`, shorthands like `3px -2px`, or
|
|
// selectors like `div.weird- p`
|
|
$pseudos = array('nth-child', 'nth-last-child', 'nth-last-of-type', 'nth-of-type');
|
|
$content = preg_replace('/:(' . implode('|', $pseudos) . ')\(\s*([+-]?)\s*(.+?)\s*([+-]?)\s*(.*?)\s*\)/', ':$1($2$3$4$5)', $content);
|
|
|
|
// remove semicolon/whitespace followed by closing bracket
|
|
$content = str_replace(';}', '}', $content);
|
|
|
|
return trim($content);
|
|
}
|
|
|
|
/**
|
|
* Replace all occurrences of functions that may contain math, where
|
|
* whitespace around operators needs to be preserved (e.g. calc, clamp).
|
|
*/
|
|
protected function extractMath()
|
|
{
|
|
$functions = array('calc', 'clamp', 'min', 'max');
|
|
$pattern = '/\b(' . implode('|', $functions) . ')(\(.+?)(?=$|;|})/m';
|
|
|
|
// PHP only supports $this inside anonymous functions since 5.4
|
|
$minifier = $this;
|
|
$callback = function ($match) use ($minifier, $pattern, &$callback) {
|
|
$function = $match[1];
|
|
$length = strlen((string) $match[2]);
|
|
$expr = '';
|
|
$opened = 0;
|
|
|
|
// the regular expression for extracting math has 1 significant problem:
|
|
// it can't determine the correct closing parenthesis...
|
|
// instead, it'll match a larger portion of code to where it's certain that
|
|
// the calc() musts have ended, and we'll figure out which is the correct
|
|
// closing parenthesis here, by counting how many have opened
|
|
for ($i = 0; $i < $length; ++$i) {
|
|
$char = $match[2][$i];
|
|
$expr .= $char;
|
|
if ($char === '(') {
|
|
++$opened;
|
|
} elseif ($char === ')' && --$opened === 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// now that we've figured out where the calc() starts and ends, extract it
|
|
$count = count($minifier->extracted);
|
|
$placeholder = 'math(' . $count . ')';
|
|
$minifier->extracted[$placeholder] = $function . '(' . trim(substr($expr, 1, -1)) . ')';
|
|
|
|
// and since we've captured more code than required, we may have some leftover
|
|
// calc() in here too - go recursive on the remaining but of code to go figure
|
|
// that out and extract what is needed
|
|
$rest = $minifier->str_replace_first($function . $expr, '', $match[0]);
|
|
$rest = preg_replace_callback($pattern, $callback, $rest);
|
|
|
|
return $placeholder . $rest;
|
|
};
|
|
|
|
$this->registerPattern($pattern, $callback);
|
|
}
|
|
|
|
/**
|
|
* Replace custom properties, whose values may be used in scenarios where
|
|
* we wouldn't want them to be minified (e.g. inside calc).
|
|
*/
|
|
protected function extractCustomProperties()
|
|
{
|
|
// PHP only supports $this inside anonymous functions since 5.4
|
|
$minifier = $this;
|
|
$this->registerPattern(
|
|
'/(?<=^|[;}{])\s*(--[^:;{}"\'\s]+)\s*:([^;{}]+)/m',
|
|
function ($match) use ($minifier) {
|
|
$placeholder = '--custom-' . count($minifier->extracted) . ':0';
|
|
$minifier->extracted[$placeholder] = $match[1] . ':' . trim((string) $match[2]);
|
|
|
|
return $placeholder;
|
|
}
|
|
);
|
|
}
|
|
|
|
/**
|
|
* 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 $target
|
|
*
|
|
* @return ConverterInterface
|
|
*/
|
|
protected function getPathConverter($source, $target)
|
|
{
|
|
return new Converter($source, $target);
|
|
}
|
|
}
|
|
|