867 lines
30 KiB
PHP
867 lines
30 KiB
PHP
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<?php
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/*!
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* CssMin
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* Author: Tubal Martin - http://tubalmartin.me/
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* Repo: https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port
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*
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* This is a PHP port of the CSS minification tool distributed with YUICompressor,
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* itself a port of the cssmin utility by Isaac Schlueter - http://foohack.com/
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* Permission is hereby granted to use the PHP version under the same
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* conditions as the YUICompressor.
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*/
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/*!
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* YUI Compressor
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* http://developer.yahoo.com/yui/compressor/
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* Author: Julien Lecomte - http://www.julienlecomte.net/
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* Copyright (c) 2013 Yahoo! Inc. All rights reserved.
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* The copyrights embodied in the content of this file are licensed
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* by Yahoo! Inc. under the BSD (revised) open source license.
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*/
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namespace LiteSpeed\Lib\CSS_MIN ;
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defined( 'WPINC' ) || exit ;
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class Minifier
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{
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const QUERY_FRACTION = '_CSSMIN_QF_';
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const COMMENT_TOKEN = '_CSSMIN_CMT_%d_';
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const COMMENT_TOKEN_START = '_CSSMIN_CMT_';
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const RULE_BODY_TOKEN = '_CSSMIN_RBT_%d_';
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const PRESERVED_TOKEN = '_CSSMIN_PTK_%d_';
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// Token lists
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private $comments = array();
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private $ruleBodies = array();
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private $preservedTokens = array();
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// Output options
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private $keepImportantComments = true;
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private $keepSourceMapComment = false;
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private $linebreakPosition = 0;
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// PHP ini limits
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private $raisePhpLimits;
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private $memoryLimit;
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private $maxExecutionTime = 60; // 1 min
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private $pcreBacktrackLimit;
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private $pcreRecursionLimit;
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// Color maps
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private $hexToNamedColorsMap;
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private $namedToHexColorsMap;
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// Regexes
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private $numRegex;
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private $charsetRegex = '/@charset [^;]+;/Si';
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private $importRegex = '/@import [^;]+;/Si';
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private $namespaceRegex = '/@namespace [^;]+;/Si';
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private $namedToHexColorsRegex;
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private $shortenOneZeroesRegex;
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private $shortenTwoZeroesRegex;
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private $shortenThreeZeroesRegex;
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private $shortenFourZeroesRegex;
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private $unitsGroupRegex = '(?:ch|cm|em|ex|gd|in|mm|px|pt|pc|q|rem|vh|vmax|vmin|vw|%)';
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/**
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* @param bool|int $raisePhpLimits If true, PHP settings will be raised if needed
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*/
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public function __construct($raisePhpLimits = true)
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{
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$this->raisePhpLimits = (bool) $raisePhpLimits;
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$this->memoryLimit = 128 * 1048576; // 128MB in bytes
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$this->pcreBacktrackLimit = 1000 * 1000;
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$this->pcreRecursionLimit = 500 * 1000;
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$this->hexToNamedColorsMap = Colors::getHexToNamedMap();
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$this->namedToHexColorsMap = Colors::getNamedToHexMap();
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$this->namedToHexColorsRegex = sprintf(
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'/([:,( ])(%s)( |,|\)|;|$)/Si',
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implode('|', array_keys($this->namedToHexColorsMap))
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);
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$this->numRegex = sprintf('-?\d*\.?\d+%s?', $this->unitsGroupRegex);
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$this->setShortenZeroValuesRegexes();
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}
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/**
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* Parses & minifies the given input CSS string
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* @param string $css
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* @return string
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*/
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public function run($css = '')
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{
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if (empty($css) || !is_string($css)) {
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return '';
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}
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$this->resetRunProperties();
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if ($this->raisePhpLimits) {
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$this->doRaisePhpLimits();
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}
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return $this->minify($css);
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}
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/**
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* Sets whether to keep or remove sourcemap special comment.
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* Sourcemap comments are removed by default.
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* @param bool $keepSourceMapComment
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*/
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public function keepSourceMapComment($keepSourceMapComment = true)
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{
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$this->keepSourceMapComment = (bool) $keepSourceMapComment;
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}
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/**
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* Sets whether to keep or remove important comments.
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* Important comments outside of a declaration block are kept by default.
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* @param bool $removeImportantComments
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*/
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public function removeImportantComments($removeImportantComments = true)
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{
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$this->keepImportantComments = !(bool) $removeImportantComments;
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}
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/**
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* Sets the approximate column after which long lines will be splitted in the output
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* with a linebreak.
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* @param int $position
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*/
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public function setLineBreakPosition($position)
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{
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$this->linebreakPosition = (int) $position;
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}
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/**
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* Sets the memory limit for this script
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* @param int|string $limit
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*/
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public function setMemoryLimit($limit)
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{
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$this->memoryLimit = Utils::normalizeInt($limit);
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}
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/**
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* Sets the maximum execution time for this script
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* @param int|string $seconds
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*/
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public function setMaxExecutionTime($seconds)
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{
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$this->maxExecutionTime = (int) $seconds;
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}
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/**
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* Sets the PCRE backtrack limit for this script
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* @param int $limit
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*/
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public function setPcreBacktrackLimit($limit)
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{
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$this->pcreBacktrackLimit = (int) $limit;
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}
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/**
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* Sets the PCRE recursion limit for this script
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* @param int $limit
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*/
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public function setPcreRecursionLimit($limit)
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{
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$this->pcreRecursionLimit = (int) $limit;
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}
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/**
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* Builds regular expressions needed for shortening zero values
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*/
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private function setShortenZeroValuesRegexes()
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{
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$zeroRegex = '0'. $this->unitsGroupRegex;
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$numOrPosRegex = '('. $this->numRegex .'|top|left|bottom|right|center) ';
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$oneZeroSafeProperties = array(
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'(?:line-)?height',
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'(?:(?:min|max)-)?width',
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'top',
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'left',
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'background-position',
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'bottom',
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'right',
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'border(?:-(?:top|left|bottom|right))?(?:-width)?',
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'border-(?:(?:top|bottom)-(?:left|right)-)?radius',
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'column-(?:gap|width)',
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'margin(?:-(?:top|left|bottom|right))?',
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'outline-width',
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'padding(?:-(?:top|left|bottom|right))?'
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);
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// First zero regex
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$regex = '/(^|;)('. implode('|', $oneZeroSafeProperties) .'):%s/Si';
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$this->shortenOneZeroesRegex = sprintf($regex, $zeroRegex);
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// Multiple zeroes regexes
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$regex = '/(^|;)(margin|padding|border-(?:width|radius)|background-position):%s/Si';
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$this->shortenTwoZeroesRegex = sprintf($regex, $numOrPosRegex . $zeroRegex);
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$this->shortenThreeZeroesRegex = sprintf($regex, $numOrPosRegex . $numOrPosRegex . $zeroRegex);
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$this->shortenFourZeroesRegex = sprintf($regex, $numOrPosRegex . $numOrPosRegex . $numOrPosRegex . $zeroRegex);
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}
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/**
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* Resets properties whose value may change between runs
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*/
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private function resetRunProperties()
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{
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$this->comments = array();
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$this->ruleBodies = array();
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$this->preservedTokens = array();
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}
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/**
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* Tries to configure PHP to use at least the suggested minimum settings
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* @return void
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*/
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private function doRaisePhpLimits()
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{
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$phpLimits = array(
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'memory_limit' => $this->memoryLimit,
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'max_execution_time' => $this->maxExecutionTime,
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'pcre.backtrack_limit' => $this->pcreBacktrackLimit,
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'pcre.recursion_limit' => $this->pcreRecursionLimit
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);
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// If current settings are higher respect them.
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foreach ($phpLimits as $name => $suggested) {
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$current = Utils::normalizeInt(ini_get($name));
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if ($current >= $suggested) {
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continue;
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}
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// memoryLimit exception: allow -1 for "no memory limit".
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if ($name === 'memory_limit' && $current === -1) {
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continue;
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}
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// maxExecutionTime exception: allow 0 for "no memory limit".
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if ($name === 'max_execution_time' && $current === 0) {
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continue;
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}
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ini_set($name, $suggested);
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}
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}
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/**
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* Registers a preserved token
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* @param string $token
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* @return string The token ID string
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*/
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private function registerPreservedToken($token)
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{
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$tokenId = sprintf(self::PRESERVED_TOKEN, count($this->preservedTokens));
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$this->preservedTokens[$tokenId] = $token;
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return $tokenId;
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}
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/**
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* Registers a candidate comment token
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* @param string $comment
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* @return string The comment token ID string
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*/
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private function registerCommentToken($comment)
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{
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$tokenId = sprintf(self::COMMENT_TOKEN, count($this->comments));
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$this->comments[$tokenId] = $comment;
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return $tokenId;
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}
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/**
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* Registers a rule body token
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* @param string $body the minified rule body
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* @return string The rule body token ID string
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*/
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private function registerRuleBodyToken($body)
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{
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if (empty($body)) {
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return '';
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}
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$tokenId = sprintf(self::RULE_BODY_TOKEN, count($this->ruleBodies));
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$this->ruleBodies[$tokenId] = $body;
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return $tokenId;
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}
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/**
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* Parses & minifies the given input CSS string
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* @param string $css
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* @return string
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*/
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private function minify($css)
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{
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// Process data urls
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$css = $this->processDataUrls($css);
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// Process comments
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$css = preg_replace_callback(
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'/(?<!\\\\)\/\*(.*?)\*(?<!\\\\)\//Ss',
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array($this, 'processCommentsCallback'),
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$css
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);
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// IE7: Process Microsoft matrix filters (whitespaces between Matrix parameters). Can contain strings inside.
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$css = preg_replace_callback(
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'/filter:\s*progid:DXImageTransform\.Microsoft\.Matrix\(([^)]+)\)/Ss',
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array($this, 'processOldIeSpecificMatrixDefinitionCallback'),
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$css
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);
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// Process quoted unquotable attribute selectors to unquote them. Covers most common cases.
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// Likelyhood of a quoted attribute selector being a substring in a string: Very very low.
|
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$css = preg_replace(
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'/\[\s*([a-z][a-z-]+)\s*([\*\|\^\$~]?=)\s*[\'"](-?[a-z_][a-z0-9-_]+)[\'"]\s*\]/Ssi',
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'[$1$2$3]',
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$css
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);
|
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// Process strings so their content doesn't get accidentally minified
|
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$double_quoted = '"(?:[^"\\\\]|\\\\.)*"';
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$single_quoted = "'(?:[^'\\\\]|\\\\.)*'";
|
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$css = preg_replace_callback(
|
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"/(?<!\\\\)(?:$double_quoted|$single_quoted)/S",
|
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array($this, 'processStringsCallback'),
|
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$css
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);
|
||
|
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|
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|
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// Normalize all whitespace strings to single spaces. Easier to work with that way.
|
||
|
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$css = preg_replace('/\s+/S', ' ', $css);
|
||
|
|
|
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// Process comments
|
||
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$css = $this->processComments($css);
|
||
|
|
|
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|
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// Process rule bodies
|
||
|
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$css = $this->processRuleBodies($css);
|
||
|
|
|
||
|
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// Process at-rules and selectors
|
||
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$css = $this->processAtRulesAndSelectors($css);
|
||
|
|
|
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|
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// Restore preserved rule bodies before splitting
|
||
|
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$css = strtr($css, $this->ruleBodies);
|
||
|
|
|
||
|
|
// Some source control tools don't like it when files containing lines longer
|
||
|
|
// than, say 8000 characters, are checked in. The linebreak option is used in
|
||
|
|
// that case to split long lines after a specific column.
|
||
|
|
if ($this->linebreakPosition > 0) {
|
||
|
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$l = strlen($css);
|
||
|
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$offset = $this->linebreakPosition;
|
||
|
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while (preg_match('/(?<!\\\\)\}(?!\n)/S', $css, $matches, PREG_OFFSET_CAPTURE, $offset)) {
|
||
|
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$matchIndex = $matches[0][1];
|
||
|
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$css = substr_replace($css, "\n", $matchIndex + 1, 0);
|
||
|
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$offset = $matchIndex + 2 + $this->linebreakPosition;
|
||
|
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$l += 1;
|
||
|
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if ($offset > $l) {
|
||
|
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break;
|
||
|
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}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Restore preserved comments and strings
|
||
|
|
$css = strtr($css, $this->preservedTokens);
|
||
|
|
|
||
|
|
return trim($css);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Searches & replaces all data urls with tokens before we start compressing,
|
||
|
|
* to avoid performance issues running some of the subsequent regexes against large string chunks.
|
||
|
|
* @param string $css
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function processDataUrls($css)
|
||
|
|
{
|
||
|
|
$ret = '';
|
||
|
|
$searchOffset = $substrOffset = 0;
|
||
|
|
|
||
|
|
// Since we need to account for non-base64 data urls, we need to handle
|
||
|
|
// ' and ) being part of the data string.
|
||
|
|
while (preg_match('/url\(\s*(["\']?)data:/Si', $css, $m, PREG_OFFSET_CAPTURE, $searchOffset)) {
|
||
|
|
$matchStartIndex = $m[0][1];
|
||
|
|
$dataStartIndex = $matchStartIndex + 4; // url( length
|
||
|
|
$searchOffset = $matchStartIndex + strlen($m[0][0]);
|
||
|
|
$terminator = $m[1][0]; // ', " or empty (not quoted)
|
||
|
|
$terminatorRegex = '/(?<!\\\\)'. (strlen($terminator) === 0 ? '' : $terminator.'\s*') .'(\))/S';
|
||
|
|
|
||
|
|
$ret .= substr($css, $substrOffset, $matchStartIndex - $substrOffset);
|
||
|
|
|
||
|
|
// Terminator found
|
||
|
|
if (preg_match($terminatorRegex, $css, $matches, PREG_OFFSET_CAPTURE, $searchOffset)) {
|
||
|
|
$matchEndIndex = $matches[1][1];
|
||
|
|
$searchOffset = $matchEndIndex + 1;
|
||
|
|
$token = substr($css, $dataStartIndex, $matchEndIndex - $dataStartIndex);
|
||
|
|
|
||
|
|
// Remove all spaces only for base64 encoded URLs.
|
||
|
|
if (stripos($token, 'base64,') !== false) {
|
||
|
|
$token = preg_replace('/\s+/S', '', $token);
|
||
|
|
}
|
||
|
|
|
||
|
|
$ret .= 'url('. $this->registerPreservedToken(trim($token)) .')';
|
||
|
|
// No end terminator found, re-add the whole match. Should we throw/warn here?
|
||
|
|
} else {
|
||
|
|
$ret .= substr($css, $matchStartIndex, $searchOffset - $matchStartIndex);
|
||
|
|
}
|
||
|
|
|
||
|
|
$substrOffset = $searchOffset;
|
||
|
|
}
|
||
|
|
|
||
|
|
$ret .= substr($css, $substrOffset);
|
||
|
|
|
||
|
|
return $ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Registers all comments found as candidates to be preserved.
|
||
|
|
* @param array $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function processCommentsCallback($matches)
|
||
|
|
{
|
||
|
|
return '/*'. $this->registerCommentToken($matches[1]) .'*/';
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Preserves old IE Matrix string definition
|
||
|
|
* @param array $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function processOldIeSpecificMatrixDefinitionCallback($matches)
|
||
|
|
{
|
||
|
|
return 'filter:progid:DXImageTransform.Microsoft.Matrix('. $this->registerPreservedToken($matches[1]) .')';
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Preserves strings found
|
||
|
|
* @param array $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function processStringsCallback($matches)
|
||
|
|
{
|
||
|
|
$match = $matches[0];
|
||
|
|
$quote = substr($match, 0, 1);
|
||
|
|
$match = substr($match, 1, -1);
|
||
|
|
|
||
|
|
// maybe the string contains a comment-like substring?
|
||
|
|
// one, maybe more? put'em back then
|
||
|
|
if (strpos($match, self::COMMENT_TOKEN_START) !== false) {
|
||
|
|
$match = strtr($match, $this->comments);
|
||
|
|
}
|
||
|
|
|
||
|
|
// minify alpha opacity in filter strings
|
||
|
|
$match = str_ireplace('progid:DXImageTransform.Microsoft.Alpha(Opacity=', 'alpha(opacity=', $match);
|
||
|
|
|
||
|
|
return $quote . $this->registerPreservedToken($match) . $quote;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Preserves or removes comments found.
|
||
|
|
* @param string $css
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function processComments($css)
|
||
|
|
{
|
||
|
|
foreach ($this->comments as $commentId => $comment) {
|
||
|
|
$commentIdString = '/*'. $commentId .'*/';
|
||
|
|
|
||
|
|
// ! in the first position of the comment means preserve
|
||
|
|
// so push to the preserved tokens keeping the !
|
||
|
|
if ($this->keepImportantComments && strpos($comment, '!') === 0) {
|
||
|
|
$preservedTokenId = $this->registerPreservedToken($comment);
|
||
|
|
// Put new lines before and after /*! important comments
|
||
|
|
$css = str_replace($commentIdString, "\n/*$preservedTokenId*/\n", $css);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// # sourceMappingURL= in the first position of the comment means sourcemap
|
||
|
|
// so push to the preserved tokens if {$this->keepSourceMapComment} is truthy.
|
||
|
|
if ($this->keepSourceMapComment && strpos($comment, '# sourceMappingURL=') === 0) {
|
||
|
|
$preservedTokenId = $this->registerPreservedToken($comment);
|
||
|
|
// Add new line before the sourcemap comment
|
||
|
|
$css = str_replace($commentIdString, "\n/*$preservedTokenId*/", $css);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Keep empty comments after child selectors (IE7 hack)
|
||
|
|
// e.g. html >/**/ body
|
||
|
|
if (strlen($comment) === 0 && strpos($css, '>/*'.$commentId) !== false) {
|
||
|
|
$css = str_replace($commentId, $this->registerPreservedToken(''), $css);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// in all other cases kill the comment
|
||
|
|
$css = str_replace($commentIdString, '', $css);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Normalize whitespace again
|
||
|
|
$css = preg_replace('/ +/S', ' ', $css);
|
||
|
|
|
||
|
|
return $css;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Finds, minifies & preserves all rule bodies.
|
||
|
|
* @param string $css the whole stylesheet.
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function processRuleBodies($css)
|
||
|
|
{
|
||
|
|
$ret = '';
|
||
|
|
$searchOffset = $substrOffset = 0;
|
||
|
|
|
||
|
|
while (($blockStartPos = strpos($css, '{', $searchOffset)) !== false) {
|
||
|
|
$blockEndPos = strpos($css, '}', $blockStartPos);
|
||
|
|
if ( ! $blockEndPos ) throw new \Exception( 'CSS parse error' ) ;
|
||
|
|
|
||
|
|
$nextBlockStartPos = strpos($css, '{', $blockStartPos + 1);
|
||
|
|
$ret .= substr($css, $substrOffset, $blockStartPos - $substrOffset);
|
||
|
|
|
||
|
|
if ($nextBlockStartPos !== false && $nextBlockStartPos < $blockEndPos) {
|
||
|
|
$ret .= substr($css, $blockStartPos, $nextBlockStartPos - $blockStartPos);
|
||
|
|
$searchOffset = $nextBlockStartPos;
|
||
|
|
} else {
|
||
|
|
$ruleBody = substr($css, $blockStartPos + 1, $blockEndPos - $blockStartPos - 1);
|
||
|
|
$ruleBodyToken = $this->registerRuleBodyToken($this->processRuleBody($ruleBody));
|
||
|
|
$ret .= '{'. $ruleBodyToken .'}';
|
||
|
|
$searchOffset = $blockEndPos + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
$substrOffset = $searchOffset;
|
||
|
|
}
|
||
|
|
|
||
|
|
$ret .= substr($css, $substrOffset);
|
||
|
|
|
||
|
|
return $ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Compresses non-group rule bodies.
|
||
|
|
* @param string $body The rule body without curly braces
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function processRuleBody($body)
|
||
|
|
{
|
||
|
|
$body = trim($body);
|
||
|
|
|
||
|
|
// Remove spaces before the things that should not have spaces before them.
|
||
|
|
$body = preg_replace('/ ([:=,)*\/;\n])/S', '$1', $body);
|
||
|
|
|
||
|
|
// Remove the spaces after the things that should not have spaces after them.
|
||
|
|
$body = preg_replace('/([:=,(*\/!;\n]) /S', '$1', $body);
|
||
|
|
|
||
|
|
// Replace multiple semi-colons in a row by a single one
|
||
|
|
$body = preg_replace('/;;+/S', ';', $body);
|
||
|
|
|
||
|
|
// Remove semicolon before closing brace except when:
|
||
|
|
// - The last property is prefixed with a `*` (lte IE7 hack) to avoid issues on Symbian S60 3.x browsers.
|
||
|
|
if (!preg_match('/\*[a-z0-9-]+:[^;]+;$/Si', $body)) {
|
||
|
|
$body = rtrim($body, ';');
|
||
|
|
}
|
||
|
|
|
||
|
|
// Remove important comments inside a rule body (because they make no sense here).
|
||
|
|
if (strpos($body, '/*') !== false) {
|
||
|
|
$body = preg_replace('/\n?\/\*[A-Z0-9_]+\*\/\n?/S', '', $body);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Empty rule body? Exit :)
|
||
|
|
if (empty($body)) {
|
||
|
|
return '';
|
||
|
|
}
|
||
|
|
|
||
|
|
// Shorten font-weight values
|
||
|
|
$body = preg_replace(
|
||
|
|
array('/(font-weight:)bold\b/Si', '/(font-weight:)normal\b/Si'),
|
||
|
|
array('${1}700', '${1}400'),
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
|
||
|
|
// Shorten background property
|
||
|
|
$body = preg_replace('/(background:)(?:none|transparent)( !|;|$)/Si', '${1}0 0$2', $body);
|
||
|
|
|
||
|
|
// Shorten opacity IE filter
|
||
|
|
$body = str_ireplace('progid:DXImageTransform.Microsoft.Alpha(Opacity=', 'alpha(opacity=', $body);
|
||
|
|
|
||
|
|
// 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.
|
||
|
|
$body = preg_replace_callback(
|
||
|
|
'/(rgb|hsl)\(([0-9,.% -]+)\)(.|$)/Si',
|
||
|
|
array($this, 'shortenHslAndRgbToHexCallback'),
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
|
||
|
|
// Shorten colors from #AABBCC to #ABC or shorter color name:
|
||
|
|
// - Look for hex colors which don't have a "=" in front of them (to avoid MSIE filters)
|
||
|
|
$body = preg_replace_callback(
|
||
|
|
'/(?<!=)#([0-9a-f]{3,6})( |,|\)|;|$)/Si',
|
||
|
|
array($this, 'shortenHexColorsCallback'),
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
|
||
|
|
// Shorten long named colors with a shorter HEX counterpart: white -> #fff.
|
||
|
|
// Run at least 2 times to cover most cases
|
||
|
|
$body = preg_replace_callback(
|
||
|
|
array($this->namedToHexColorsRegex, $this->namedToHexColorsRegex),
|
||
|
|
array($this, 'shortenNamedColorsCallback'),
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
|
||
|
|
// Replace positive sign from numbers before the leading space is removed.
|
||
|
|
// +1.2em to 1.2em, +.8px to .8px, +2% to 2%
|
||
|
|
$body = preg_replace('/([ :,(])\+(\.?\d+)/S', '$1$2', $body);
|
||
|
|
|
||
|
|
// shorten ms to s
|
||
|
|
$body = preg_replace_callback('/([ :,(])(-?)(\d{3,})ms/Si', function ($matches) {
|
||
|
|
return $matches[1] . $matches[2] . ((int) $matches[3] / 1000) .'s';
|
||
|
|
}, $body);
|
||
|
|
|
||
|
|
// Remove leading zeros from integer and float numbers.
|
||
|
|
// 000.6 to .6, -0.8 to -.8, 0050 to 50, -01.05 to -1.05
|
||
|
|
$body = preg_replace('/([ :,(])(-?)0+([1-9]?\.?\d+)/S', '$1$2$3', $body);
|
||
|
|
|
||
|
|
// Remove trailing zeros from float numbers.
|
||
|
|
// -6.0100em to -6.01em, .0100 to .01, 1.200px to 1.2px
|
||
|
|
$body = preg_replace('/([ :,(])(-?\d?\.\d+?)0+([^\d])/S', '$1$2$3', $body);
|
||
|
|
|
||
|
|
// Remove trailing .0 -> -9.0 to -9
|
||
|
|
$body = preg_replace('/([ :,(])(-?\d+)\.0([^\d])/S', '$1$2$3', $body);
|
||
|
|
|
||
|
|
// Replace 0 length numbers with 0
|
||
|
|
$body = preg_replace('/([ :,(])-?\.?0+([^\d])/S', '${1}0$2', $body);
|
||
|
|
|
||
|
|
// Shorten zero values for safe properties only
|
||
|
|
$body = preg_replace(
|
||
|
|
array(
|
||
|
|
$this->shortenOneZeroesRegex,
|
||
|
|
$this->shortenTwoZeroesRegex,
|
||
|
|
$this->shortenThreeZeroesRegex,
|
||
|
|
$this->shortenFourZeroesRegex
|
||
|
|
),
|
||
|
|
array(
|
||
|
|
'$1$2:0',
|
||
|
|
'$1$2:$3 0',
|
||
|
|
'$1$2:$3 $4 0',
|
||
|
|
'$1$2:$3 $4 $5 0'
|
||
|
|
),
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
|
||
|
|
// Replace 0 0 0; or 0 0 0 0; with 0 0 for background-position property.
|
||
|
|
$body = preg_replace('/(background-position):0(?: 0){2,3}( !|;|$)/Si', '$1:0 0$2', $body);
|
||
|
|
|
||
|
|
// Shorten suitable shorthand properties with repeated values
|
||
|
|
$body = preg_replace(
|
||
|
|
array(
|
||
|
|
'/(margin|padding|border-(?:width|radius)):('.$this->numRegex.')(?: \2)+( !|;|$)/Si',
|
||
|
|
'/(border-(?:style|color)):([#a-z0-9]+)(?: \2)+( !|;|$)/Si'
|
||
|
|
),
|
||
|
|
'$1:$2$3',
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
$body = preg_replace(
|
||
|
|
array(
|
||
|
|
'/(margin|padding|border-(?:width|radius)):'.
|
||
|
|
'('.$this->numRegex.') ('.$this->numRegex.') \2 \3( !|;|$)/Si',
|
||
|
|
'/(border-(?:style|color)):([#a-z0-9]+) ([#a-z0-9]+) \2 \3( !|;|$)/Si'
|
||
|
|
),
|
||
|
|
'$1:$2 $3$4',
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
$body = preg_replace(
|
||
|
|
array(
|
||
|
|
'/(margin|padding|border-(?:width|radius)):'.
|
||
|
|
'('.$this->numRegex.') ('.$this->numRegex.') ('.$this->numRegex.') \3( !|;|$)/Si',
|
||
|
|
'/(border-(?:style|color)):([#a-z0-9]+) ([#a-z0-9]+) ([#a-z0-9]+) \3( !|;|$)/Si'
|
||
|
|
),
|
||
|
|
'$1:$2 $3 $4$5',
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
|
||
|
|
// Lowercase some common functions that can be values
|
||
|
|
$body = preg_replace_callback(
|
||
|
|
'/(?:attr|blur|brightness|circle|contrast|cubic-bezier|drop-shadow|ellipse|from|grayscale|'.
|
||
|
|
'hsla?|hue-rotate|inset|invert|local|minmax|opacity|perspective|polygon|rgba?|rect|repeat|saturate|sepia|'.
|
||
|
|
'steps|to|url|var|-webkit-gradient|'.
|
||
|
|
'(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?(?:calc|(?:repeating-)?(?:linear|radial)-gradient))\(/Si',
|
||
|
|
array($this, 'strtolowerCallback'),
|
||
|
|
$body
|
||
|
|
);
|
||
|
|
|
||
|
|
// Lowercase all uppercase properties
|
||
|
|
$body = preg_replace_callback('/(?:^|;)[A-Z-]+:/S', array($this, 'strtolowerCallback'), $body);
|
||
|
|
|
||
|
|
return $body;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Compresses At-rules and selectors.
|
||
|
|
* @param string $css the whole stylesheet with rule bodies tokenized.
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function processAtRulesAndSelectors($css)
|
||
|
|
{
|
||
|
|
$charset = '';
|
||
|
|
$imports = '';
|
||
|
|
$namespaces = '';
|
||
|
|
|
||
|
|
// Remove spaces before the things that should not have spaces before them.
|
||
|
|
$css = preg_replace('/ ([@{};>+)\]~=,\/\n])/S', '$1', $css);
|
||
|
|
|
||
|
|
// Remove the spaces after the things that should not have spaces after them.
|
||
|
|
$css = preg_replace('/([{}:;>+(\[~=,\/\n]) /S', '$1', $css);
|
||
|
|
|
||
|
|
// Shorten shortable double colon (CSS3) pseudo-elements to single colon (CSS2)
|
||
|
|
$css = preg_replace('/::(before|after|first-(?:line|letter))(\{|,)/Si', ':$1$2', $css);
|
||
|
|
|
||
|
|
// Retain space for special IE6 cases
|
||
|
|
$css = preg_replace_callback('/:first-(line|letter)(\{|,)/Si', function ($matches) {
|
||
|
|
return ':first-'. strtolower($matches[1]) .' '. $matches[2];
|
||
|
|
}, $css);
|
||
|
|
|
||
|
|
// Find a fraction that may used in some @media queries such as: (min-aspect-ratio: 1/1)
|
||
|
|
// Add token to add the "/" back in later
|
||
|
|
$css = preg_replace('/\(([a-z-]+):([0-9]+)\/([0-9]+)\)/Si', '($1:$2'. self::QUERY_FRACTION .'$3)', $css);
|
||
|
|
|
||
|
|
// Remove empty rule blocks up to 2 levels deep.
|
||
|
|
$css = preg_replace(array_fill(0, 2, '/(\{)[^{};\/\n]+\{\}/S'), '$1', $css);
|
||
|
|
$css = preg_replace('/[^{};\/\n]+\{\}/S', '', $css);
|
||
|
|
|
||
|
|
// Two important comments next to each other? Remove extra newline.
|
||
|
|
if ($this->keepImportantComments) {
|
||
|
|
$css = str_replace("\n\n", "\n", $css);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Restore fraction
|
||
|
|
$css = str_replace(self::QUERY_FRACTION, '/', $css);
|
||
|
|
|
||
|
|
// Lowercase some popular @directives
|
||
|
|
$css = preg_replace_callback(
|
||
|
|
'/(?<!\\\\)@(?:charset|document|font-face|import|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?keyframes|media|'.
|
||
|
|
'namespace|page|supports|viewport)/Si',
|
||
|
|
array($this, 'strtolowerCallback'),
|
||
|
|
$css
|
||
|
|
);
|
||
|
|
|
||
|
|
// Lowercase some popular media types
|
||
|
|
$css = preg_replace_callback(
|
||
|
|
'/[ ,](?:all|aural|braille|handheld|print|projection|screen|tty|tv|embossed|speech)[ ,;{]/Si',
|
||
|
|
array($this, 'strtolowerCallback'),
|
||
|
|
$css
|
||
|
|
);
|
||
|
|
|
||
|
|
// Lowercase some common pseudo-classes & pseudo-elements
|
||
|
|
$css = preg_replace_callback(
|
||
|
|
'/(?<!\\\\):(?:active|after|before|checked|default|disabled|empty|enabled|first-(?:child|of-type)|'.
|
||
|
|
'focus(?:-within)?|hover|indeterminate|in-range|invalid|lang\(|last-(?:child|of-type)|left|link|not\(|'.
|
||
|
|
'nth-(?:child|of-type)\(|nth-last-(?:child|of-type)\(|only-(?:child|of-type)|optional|out-of-range|'.
|
||
|
|
'read-(?:only|write)|required|right|root|:selection|target|valid|visited)/Si',
|
||
|
|
array($this, 'strtolowerCallback'),
|
||
|
|
$css
|
||
|
|
);
|
||
|
|
|
||
|
|
// @charset handling
|
||
|
|
if (preg_match($this->charsetRegex, $css, $matches)) {
|
||
|
|
// Keep the first @charset at-rule found
|
||
|
|
$charset = $matches[0];
|
||
|
|
// Delete all @charset at-rules
|
||
|
|
$css = preg_replace($this->charsetRegex, '', $css);
|
||
|
|
}
|
||
|
|
|
||
|
|
// @import handling
|
||
|
|
$css = preg_replace_callback($this->importRegex, function ($matches) use (&$imports) {
|
||
|
|
// Keep all @import at-rules found for later
|
||
|
|
$imports .= $matches[0];
|
||
|
|
// Delete all @import at-rules
|
||
|
|
return '';
|
||
|
|
}, $css);
|
||
|
|
|
||
|
|
// @namespace handling
|
||
|
|
$css = preg_replace_callback($this->namespaceRegex, function ($matches) use (&$namespaces) {
|
||
|
|
// Keep all @namespace at-rules found for later
|
||
|
|
$namespaces .= $matches[0];
|
||
|
|
// Delete all @namespace at-rules
|
||
|
|
return '';
|
||
|
|
}, $css);
|
||
|
|
|
||
|
|
// Order critical at-rules:
|
||
|
|
// 1. @charset first
|
||
|
|
// 2. @imports below @charset
|
||
|
|
// 3. @namespaces below @imports
|
||
|
|
$css = $charset . $imports . $namespaces . $css;
|
||
|
|
|
||
|
|
return $css;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts hsl() & rgb() colors to HEX format.
|
||
|
|
* @param $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function shortenHslAndRgbToHexCallback($matches)
|
||
|
|
{
|
||
|
|
$type = $matches[1];
|
||
|
|
$values = explode(',', $matches[2]);
|
||
|
|
$terminator = $matches[3];
|
||
|
|
|
||
|
|
if ($type === 'hsl') {
|
||
|
|
$values = Utils::hslToRgb($values);
|
||
|
|
}
|
||
|
|
|
||
|
|
$hexColors = Utils::rgbToHex($values);
|
||
|
|
|
||
|
|
// Restore space after rgb() or hsl() function in some cases such as:
|
||
|
|
// background-image: linear-gradient(to bottom, rgb(210,180,140) 10%, rgb(255,0,0) 90%);
|
||
|
|
if (!empty($terminator) && !preg_match('/[ ,);]/S', $terminator)) {
|
||
|
|
$terminator = ' '. $terminator;
|
||
|
|
}
|
||
|
|
|
||
|
|
return '#'. implode('', $hexColors) . $terminator;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Compresses HEX color values of the form #AABBCC to #ABC or short color name.
|
||
|
|
* @param $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function shortenHexColorsCallback($matches)
|
||
|
|
{
|
||
|
|
$hex = $matches[1];
|
||
|
|
|
||
|
|
// Shorten suitable 6 chars HEX colors
|
||
|
|
if (strlen($hex) === 6 && preg_match('/^([0-9a-f])\1([0-9a-f])\2([0-9a-f])\3$/Si', $hex, $m)) {
|
||
|
|
$hex = $m[1] . $m[2] . $m[3];
|
||
|
|
}
|
||
|
|
|
||
|
|
// Lowercase
|
||
|
|
$hex = '#'. strtolower($hex);
|
||
|
|
|
||
|
|
// Replace Hex colors with shorter color names
|
||
|
|
$color = array_key_exists($hex, $this->hexToNamedColorsMap) ? $this->hexToNamedColorsMap[$hex] : $hex;
|
||
|
|
|
||
|
|
return $color . $matches[2];
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Shortens all named colors with a shorter HEX counterpart for a set of safe properties
|
||
|
|
* e.g. white -> #fff
|
||
|
|
* @param array $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function shortenNamedColorsCallback($matches)
|
||
|
|
{
|
||
|
|
return $matches[1] . $this->namedToHexColorsMap[strtolower($matches[2])] . $matches[3];
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Makes a string lowercase
|
||
|
|
* @param array $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function strtolowerCallback($matches)
|
||
|
|
{
|
||
|
|
return strtolower($matches[0]);
|
||
|
|
}
|
||
|
|
}
|