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+<?php
+/**
+ * CSS Minifier
+ *
+ * Please report bugs on https://github.com/matthiasmullie/minify/issues
+ *
+ * @author Matthias Mullie <minify@mullie.eu>
+ * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
+ * @license MIT License
+ */
+
+namespace MatthiasMullie\Minify;
+
+use MatthiasMullie\Minify\Exceptions\FileImportException;
+use MatthiasMullie\PathConverter\ConverterInterface;
+use MatthiasMullie\PathConverter\Converter;
+
+/**
+ * CSS minifier
+ *
+ * Please report bugs on https://github.com/matthiasmullie/minify/issues
+ *
+ * @package Minify
+ * @author Matthias Mullie <minify@mullie.eu>
+ * @author Tijs Verkoyen <minify@verkoyen.eu>
+ * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
+ * @license MIT License
+ */
+class CSS extends Minify
+{
+ /**
+ * @var int maximum inport size in kB
+ */
+ protected $maxImportSize = 5;
+
+ /**
+ * @var string[] valid import extensions
+ */
+ protected $importExtensions = array(
+ 'gif' => 'data:image/gif',
+ 'png' => 'data:image/png',
+ 'jpe' => 'data:image/jpeg',
+ 'jpg' => 'data:image/jpeg',
+ 'jpeg' => 'data:image/jpeg',
+ 'svg' => 'data:image/svg+xml',
+ 'woff' => 'data:application/x-font-woff',
+ 'tif' => 'image/tiff',
+ 'tiff' => 'image/tiff',
+ 'xbm' => 'image/x-xbitmap',
+ );
+
+ /**
+ * Set the maximum size if files to be imported.
+ *
+ * Files larger than this size (in kB) will not be imported into the CSS.
+ * Importing files into the CSS as data-uri will save you some connections,
+ * but we should only import relatively small decorative images so that our
+ * CSS file doesn't get too bulky.
+ *
+ * @param int $size Size in kB
+ */
+ public function setMaxImportSize($size)
+ {
+ $this->maxImportSize = $size;
+ }
+
+ /**
+ * Set the type of extensions to be imported into the CSS (to save network
+ * connections).
+ * Keys of the array should be the file extensions & respective values
+ * should be the data type.
+ *
+ * @param string[] $extensions Array of file extensions
+ */
+ public function setImportExtensions(array $extensions)
+ {
+ $this->importExtensions = $extensions;
+ }
+
+ /**
+ * Move any import statements to the top.
+ *
+ * @param string $content Nearly finished CSS content
+ *
+ * @return string
+ */
+ protected function moveImportsToTop($content)
+ {
+ if (preg_match_all('/(;?)(@import (?<url>url\()?(?P<quotes>["\']?).+?(?P=quotes)(?(url)\)));?/', $content, $matches)) {
+ // remove from content
+ foreach ($matches[0] as $import) {
+ $content = str_replace($import, '', $content);
+ }
+
+ // add to top
+ $content = implode(';', $matches[2]).';'.trim($content, ';');
+ }
+
+ return $content;
+ }
+
+ /**
+ * Combine CSS from import statements.
+ *
+ * @import's will be loaded and their content merged into the original file,
+ * to save HTTP requests.
+ *
+ * @param string $source The file to combine imports for
+ * @param string $content The CSS content to combine imports for
+ * @param string[] $parents Parent paths, for circular reference checks
+ *
+ * @return string
+ *
+ * @throws FileImportException
+ */
+ protected function combineImports($source, $content, $parents)
+ {
+ $importRegexes = array(
+ // @import url(xxx)
+ '/
+ # import statement
+ @import
+
+ # whitespace
+ \s+
+
+ # open url()
+ url\(
+
+ # (optional) open path enclosure
+ (?P<quotes>["\']?)
+
+ # fetch path
+ (?P<path>.+?)
+
+ # (optional) close path enclosure
+ (?P=quotes)
+
+ # close url()
+ \)
+
+ # (optional) trailing whitespace
+ \s*
+
+ # (optional) media statement(s)
+ (?P<media>[^;]*)
+
+ # (optional) trailing whitespace
+ \s*
+
+ # (optional) closing semi-colon
+ ;?
+
+ /ix',
+
+ // @import 'xxx'
+ '/
+
+ # import statement
+ @import
+
+ # whitespace
+ \s+
+
+ # open path enclosure
+ (?P<quotes>["\'])
+
+ # fetch path
+ (?P<path>.+?)
+
+ # close path enclosure
+ (?P=quotes)
+
+ # (optional) trailing whitespace
+ \s*
+
+ # (optional) media statement(s)
+ (?P<media>[^;]*)
+
+ # (optional) trailing whitespace
+ \s*
+
+ # (optional) closing semi-colon
+ ;?
+
+ /ix',
+ );
+
+ // find all relative imports in css
+ $matches = array();
+ foreach ($importRegexes as $importRegex) {
+ if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) {
+ $matches = array_merge($matches, $regexMatches);
+ }
+ }
+
+ $search = array();
+ $replace = array();
+
+ // loop the matches
+ foreach ($matches as $match) {
+ // get the path for the file that will be imported
+ $importPath = dirname($source).'/'.$match['path'];
+
+ // only replace the import with the content if we can grab the
+ // content of the file
+ if (!$this->canImportByPath($match['path']) || !$this->canImportFile($importPath)) {
+ continue;
+ }
+
+ // check if current file was not imported previously in the same
+ // import chain.
+ if (in_array($importPath, $parents)) {
+ throw new FileImportException('Failed to import file "'.$importPath.'": circular reference detected.');
+ }
+
+ // grab referenced file & minify it (which may include importing
+ // yet other @import statements recursively)
+ $minifier = new static($importPath);
+ $minifier->setMaxImportSize($this->maxImportSize);
+ $minifier->setImportExtensions($this->importExtensions);
+ $importContent = $minifier->execute($source, $parents);
+
+ // check if this is only valid for certain media
+ if (!empty($match['media'])) {
+ $importContent = '@media '.$match['media'].'{'.$importContent.'}';
+ }
+
+ // add to replacement array
+ $search[] = $match[0];
+ $replace[] = $importContent;
+ }
+
+ // replace the import statements
+ return str_replace($search, $replace, $content);
+ }
+
+ /**
+ * Import files into the CSS, base64-ized.
+ *
+ * @url(image.jpg) images will be loaded and their content merged into the
+ * original file, to save HTTP requests.
+ *
+ * @param string $source The file to import files for
+ * @param string $content The CSS content to import files for
+ *
+ * @return string
+ */
+ protected function importFiles($source, $content)
+ {
+ $regex = '/url\((["\']?)(.+?)\\1\)/i';
+ if ($this->importExtensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) {
+ $search = array();
+ $replace = array();
+
+ // loop the matches
+ foreach ($matches as $match) {
+ $extension = substr(strrchr($match[2], '.'), 1);
+ if ($extension && !array_key_exists($extension, $this->importExtensions)) {
+ continue;
+ }
+
+ // get the path for the file that will be imported
+ $path = $match[2];
+ $path = dirname($source).'/'.$path;
+
+ // only replace the import with the content if we're able to get
+ // the content of the file, and it's relatively small
+ if ($this->canImportFile($path) && $this->canImportBySize($path)) {
+ // grab content && base64-ize
+ $importContent = $this->load($path);
+ $importContent = base64_encode($importContent);
+
+ // build replacement
+ $search[] = $match[0];
+ $replace[] = 'url('.$this->importExtensions[$extension].';base64,'.$importContent.')';
+ }
+ }
+
+ // replace the import statements
+ $content = str_replace($search, $replace, $content);
+ }
+
+ return $content;
+ }
+
+ /**
+ * Minify the data.
+ * Perform CSS optimizations.
+ *
+ * @param string[optional] $path Path to write the data to
+ * @param string[] $parents Parent paths, for circular reference checks
+ *
+ * @return string The minified data
+ */
+ public function execute($path = null, $parents = array())
+ {
+ $content = '';
+
+ // loop CSS data (raw data and files)
+ foreach ($this->data as $source => $css) {
+ /*
+ * Let's first take out strings & comments, since we can't just
+ * remove whitespace anywhere. If whitespace occurs inside a string,
+ * we should leave it alone. E.g.:
+ * p { content: "a test" }
+ */
+ $this->extractStrings();
+ $this->stripComments();
+ $this->extractCalcs();
+ $css = $this->replace($css);
+
+ $css = $this->stripWhitespace($css);
+ $css = $this->shortenColors($css);
+ $css = $this->shortenZeroes($css);
+ $css = $this->shortenFontWeights($css);
+ $css = $this->stripEmptyTags($css);
+
+ // restore the string we've extracted earlier
+ $css = $this->restoreExtractedData($css);
+
+ $source = is_int($source) ? '' : $source;
+ $parents = $source ? array_merge($parents, array($source)) : $parents;
+ $css = $this->combineImports($source, $css, $parents);
+ $css = $this->importFiles($source, $css);
+
+ /*
+ * If we'll save to a new path, we'll have to fix the relative paths
+ * to be relative no longer to the source file, but to the new path.
+ * If we don't write to a file, fall back to same path so no
+ * conversion happens (because we still want it to go through most
+ * of the move code, which also addresses url() & @import syntax...)
+ */
+ $converter = $this->getPathConverter($source, $path ?: $source);
+ $css = $this->move($converter, $css);
+
+ // combine css
+ $content .= $css;
+ }
+
+ $content = $this->moveImportsToTop($content);
+
+ return $content;
+ }
+
+ /**
+ * Moving a css file should update all relative urls.
+ * Relative references (e.g. ../images/image.gif) in a certain css file,
+ * will have to be updated when a file is being saved at another location
+ * (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper).
+ *
+ * @param ConverterInterface $converter Relative path converter
+ * @param string $content The CSS content to update relative urls for
+ *
+ * @return string
+ */
+ protected function move(ConverterInterface $converter, $content)
+ {
+ /*
+ * Relative path references will usually be enclosed by url(). @import
+ * is an exception, where url() is not necessary around the path (but is
+ * allowed).
+ * This *could* be 1 regular expression, where both regular expressions
+ * in this array are on different sides of a |. But we're using named
+ * patterns in both regexes, the same name on both regexes. This is only
+ * possible with a (?J) modifier, but that only works after a fairly
+ * recent PCRE version. That's why I'm doing 2 separate regular
+ * expressions & combining the matches after executing of both.
+ */
+ $relativeRegexes = array(
+ // url(xxx)
+ '/
+ # open url()
+ url\(
+
+ \s*
+
+ # open path enclosure
+ (?P<quotes>["\'])?
+
+ # fetch path
+ (?P<path>.+?)
+
+ # close path enclosure
+ (?(quotes)(?P=quotes))
+
+ \s*
+
+ # close url()
+ \)
+
+ /ix',
+
+ // @import "xxx"
+ '/
+ # import statement
+ @import
+
+ # whitespace
+ \s+
+
+ # we don\'t have to check for @import url(), because the
+ # condition above will already catch these
+
+ # open path enclosure
+ (?P<quotes>["\'])
+
+ # fetch path
+ (?P<path>.+?)
+
+ # close path enclosure
+ (?P=quotes)
+
+ /ix',
+ );
+
+ // find all relative urls in css
+ $matches = array();
+ foreach ($relativeRegexes as $relativeRegex) {
+ if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) {
+ $matches = array_merge($matches, $regexMatches);
+ }
+ }
+
+ $search = array();
+ $replace = array();
+
+ // loop all urls
+ foreach ($matches as $match) {
+ // determine if it's a url() or an @import match
+ $type = (strpos($match[0], '@import') === 0 ? 'import' : 'url');
+
+ $url = $match['path'];
+ if ($this->canImportByPath($url)) {
+ // attempting to interpret GET-params makes no sense, so let's discard them for awhile
+ $params = strrchr($url, '?');
+ $url = $params ? substr($url, 0, -strlen($params)) : $url;
+
+ // fix relative url
+ $url = $converter->convert($url);
+
+ // now that the path has been converted, re-apply GET-params
+ $url .= $params;
+ }
+
+ /*
+ * Urls with control characters above 0x7e should be quoted.
+ * According to Mozilla's parser, whitespace is only allowed at the
+ * end of unquoted urls.
+ * Urls with `)` (as could happen with data: uris) should also be
+ * quoted to avoid being confused for the url() closing parentheses.
+ * And urls with a # have also been reported to cause issues.
+ * Urls with quotes inside should also remain escaped.
+ *
+ * @see https://developer.mozilla.org/nl/docs/Web/CSS/url#The_url()_functional_notation
+ * @see https://hg.mozilla.org/mozilla-central/rev/14abca4e7378
+ * @see https://github.com/matthiasmullie/minify/issues/193
+ */
+ $url = trim($url);
+ if (preg_match('/[\s\)\'"#\x{7f}-\x{9f}]/u', $url)) {
+ $url = $match['quotes'] . $url . $match['quotes'];
+ }
+
+ // build replacement
+ $search[] = $match[0];
+ if ($type === 'url') {
+ $replace[] = 'url('.$url.')';
+ } elseif ($type === 'import') {
+ $replace[] = '@import "'.$url.'"';
+ }
+ }
+
+ // replace urls
+ return str_replace($search, $replace, $content);
+ }
+
+ /**
+ * Shorthand hex color codes.
+ * #FF0000 -> #F00.
+ *
+ * @param string $content The CSS content to shorten the hex color codes for
+ *
+ * @return string
+ */
+ protected function shortenColors($content)
+ {
+ $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);
+
+ // remove alpha channel if it's pointless...
+ $content = preg_replace('/(?<=[: ])#([0-9a-z]{6})ff?(?=[; }])/i', '#$1', $content);
+ $content = preg_replace('/(?<=[: ])#([0-9a-z]{3})f?(?=[; }])/i', '#$1', $content);
+
+ $colors = array(
+ // we can shorten some even more by replacing them with their color name
+ '#F0FFFF' => 'azure',
+ '#F5F5DC' => 'beige',
+ '#A52A2A' => 'brown',
+ '#FF7F50' => 'coral',
+ '#FFD700' => 'gold',
+ '#808080' => 'gray',
+ '#008000' => 'green',
+ '#4B0082' => 'indigo',
+ '#FFFFF0' => 'ivory',
+ '#F0E68C' => 'khaki',
+ '#FAF0E6' => 'linen',
+ '#800000' => 'maroon',
+ '#000080' => 'navy',
+ '#808000' => 'olive',
+ '#CD853F' => 'peru',
+ '#FFC0CB' => 'pink',
+ '#DDA0DD' => 'plum',
+ '#800080' => 'purple',
+ '#F00' => 'red',
+ '#FA8072' => 'salmon',
+ '#A0522D' => 'sienna',
+ '#C0C0C0' => 'silver',
+ '#FFFAFA' => 'snow',
+ '#D2B48C' => 'tan',
+ '#FF6347' => 'tomato',
+ '#EE82EE' => 'violet',
+ '#F5DEB3' => 'wheat',
+ // or the other way around
+ 'WHITE' => '#fff',
+ 'BLACK' => '#000',
+ );
+
+ return preg_replace_callback(
+ '/(?<=[: ])('.implode(array_keys($colors), '|').')(?=[; }])/i',
+ function ($match) use ($colors) {
+ return $colors[strtoupper($match[0])];
+ },
+ $content
+ );
+ }
+
+ /**
+ * Shorten CSS font weights.
+ *
+ * @param string $content The CSS content to shorten the font weights for
+ *
+ * @return string
+ */
+ protected function shortenFontWeights($content)
+ {
+ $weights = array(
+ 'normal' => 400,
+ 'bold' => 700,
+ );
+
+ $callback = function ($match) use ($weights) {
+ return $match[1].$weights[$match[2]];
+ };
+
+ return preg_replace_callback('/(font-weight\s*:\s*)('.implode('|', array_keys($weights)).')(?=[;}])/', $callback, $content);
+ }
+
+ /**
+ * Shorthand 0 values to plain 0, instead of e.g. -0em.
+ *
+ * @param string $content The CSS content to shorten the zero values for
+ *
+ * @return string
+ */
+ protected function shortenZeroes($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 `calc()` occurrences.
+ */
+ protected function extractCalcs()
+ {
+ // PHP only supports $this inside anonymous functions since 5.4
+ $minifier = $this;
+ $callback = function ($match) use ($minifier) {
+ $length = strlen($match[1]);
+ $expr = '';
+ $opened = 0;
+
+ for ($i = 0; $i < $length; $i++) {
+ $char = $match[1][$i];
+ $expr .= $char;
+ if ($char === '(') {
+ $opened++;
+ } elseif ($char === ')' && --$opened === 0) {
+ break;
+ }
+ }
+ $rest = str_replace($expr, '', $match[1]);
+ $expr = trim(substr($expr, 1, -1));
+
+ $count = count($minifier->extracted);
+ $placeholder = 'calc('.$count.')';
+ $minifier->extracted[$placeholder] = 'calc('.$expr.')';
+
+ return $placeholder.$rest;
+ };
+
+ $this->registerPattern('/calc(\(.+?)(?=$|;|calc\()/', $callback);
+ }
+
+ /**
+ * 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);
+ }
+}
generated by cgit v1.2.3 (git 2.46.0) at 2024-11-27 16:25:30 +0000