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<?php
namespace MatthiasMullie\Minify;
/**
* CSS minifier.
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @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
*/
protected $maxImportSize = 5;
/**
* @var string[]
*/
protected $importExtensions = array(
'gif' => 'data:image/gif',
'png' => 'data:image/png',
'jpg' => 'data:image/jpg',
'jpeg' => 'data:image/jpeg',
'svg' => 'data:image/svg+xml',
'woff' => 'data:application/x-font-woff',
);
/**
* 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;
}
/**
* 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 $content The CSS content to combine imports for.
* @return string
*/
protected function combineImports($source, $content)
{
$importRegexes = array(
// @import url(xxx)
'/
# import statement
@import
# whitespace
\s+
# open url()
url\(
# (optional) open path enclosure
(?P<quotes>["\']?)
# fetch path
(?P<path>
# do not fetch data uris or external sources
(?!(
["\']?
(data|https?):
))
.+?
)
# (optional) close path enclosure
(?P=quotes)
# close url()
\)
# (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>
# do not fetch data uris or external sources
(?!(
["\']?
(data|https?):
))
.+?
)
# 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) . '/' . $match['path'];
// only replace the import with the content if we can grab the
// content of the file
if (@file_exists($importPath) && is_file($importPath)) {
// grab referenced file & minify it (which may include importing
// yet other @import statements recursively)
$minifier = new static($importPath);
$importContent = $minifier->minify($source);
// check if this is only valid for certain media
if ($match['media']) {
$importContent = '@media ' . $match['media'] . '{' . $importContent . '}';
}
// add to replacement array
$search[] = $match[0];
$replace[] = $importContent;
}
}
// replace the import statements
$content = str_replace($search, $replace, $content);
return $content;
}
/**
* Convert relative paths based upon 1 path to another.
*
* E.g.
* ../images/img.gif (relative to /home/forkcms/frontend/core/layout/css)
* should become:
* ../../core/layout/images/img.gif (relative to
* /home/forkcms/frontend/cache/minified_css)
*
* @param string $path The relative path that needs to be converted.
* @param string $from The original base path.
* @param string $to The new base path.
* @return string The new relative path.
*/
protected function convertRelativePath($path, $from, $to)
{
$from = $from ? realpath($from) : '';
$to = $to ? realpath($to) : '';
// make sure we're dealing with directories
$from = @is_file($from) ? dirname($from) : $from;
$to = @is_file($to) ? dirname($to) : $to;
// deal with different operating systems' directory structure
$path = rtrim(str_replace(DIRECTORY_SEPARATOR, '/', $path), '/');
$from = rtrim(str_replace(DIRECTORY_SEPARATOR, '/', $from), '/');
$to = rtrim(str_replace(DIRECTORY_SEPARATOR, '/', $to), '/');
// if we're not dealing with a relative path, just return absolute
if (strpos($path, '/') === 0) {
return $path;
}
// get full path to file referenced from $from
$path = $from . '/' . $path;
/*
* Example:
* $path = /home/forkcms/frontend/cache/compiled_templates/../../core/layout/css/../images/img.gif
* $to = /home/forkcms/frontend/cache/minified_css
*/
// normalize paths
do {
list($path, $to) = preg_replace('/[^\/]+(?<!\.\.)\/\.\.\//', '', array($path, $to), -1, $count);
} while ($count);
/*
* Example:
* $path = /home/forkcms/frontend/core/layout/images/img.gif
* $to = /home/forkcms/frontend/cache/minified_css
*/
$path = explode('/', $path);
$to = explode('/', $to);
// compare paths & strip identical ancestors
foreach ($path as $i => $chunk) {
if (isset($to[$i]) && $path[$i] == $to[$i]) {
unset($path[$i], $to[$i]);
} else {
break;
}
}
/*
* At this point:
* $path = array('core', 'layout', 'images', 'img.gif')
* $to = array('cache', 'minified_css')
*/
$path = implode('/', $path);
// add .. for every directory that needs to be traversed for new path
$to = str_repeat('../', count($to));
/*
* At this point:
* $path = core/layout/images/img.gif
* $to = ../../
*/
// Tada!
return $to . $path;
}
/**
* 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)
{
$extensions = array_keys($this->importExtensions);
$regex = '/url\((["\']?)((?!["\']?data:).*?\.(' . implode('|', $extensions) . '))\\1\)/i';
if ($extensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) {
$search = array();
$replace = array();
// loop the matches
foreach ($matches as $match) {
// get the path for the file that will be imported
$path = $match[2];
$path = dirname($source) . '/' . $path;
$extension = $match[3];
// only replace the import with the content if we're able to get
// the content of the file, and it's relatively small
$import = @file_exists($path);
$import = $import && is_file($path);
$import = $import && filesize($path) <= $this->maxImportSize * 1024;
if (!$import) {
continue;
}
// 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] $path Path to write the data to.
* @return string The minified data.
*/
public function minify($path = null)
{
$content = '';
// loop files
foreach ($this->data as $source => $css) {
// if we'll save to a new path, we'll have to fix the relative paths
if ($source !== 0) {
$css = $this->move($source, $path, $css);
}
// combine css
$content .= $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();
$content = $this->replace($content);
$content = $this->stripWhitespace($content);
$content = $this->shortenHex($content);
$content = $this->shortenZeroes($content);
// restore the string we've extracted earlier
$content = $this->restoreExtractedData($content);
$content = $this->importFiles($path, $content);
$content = $this->combineImports($path, $content);
// save to path
if ($path !== null) {
$this->save($content, $path);
}
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 string $source The file to update relative urls for.
* @param string $destination The path the data will be written to.
* @param string $content The CSS content to update relative urls for.
* @return string
*/
protected function move($source, $destination, $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\(
# open path enclosure
(?P<quotes>["\'])?
# fetch path
(?P<path>
# do not fetch data uris or external sources
(?!(
["\']?
(data|https?):
))
.+?
)
# close path enclosure
(?(quotes)(?P=quotes))
# close url()
\)
/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>
# do not fetch data uris or external sources
(?!(
["\']?
(data|https?):
))
.+?
)
# 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');
// fix relative url
$url = $this->convertRelativePath($match['path'], dirname($source), dirname($destination));
// build replacement
$search[] = $match[0];
if ($type == 'url') {
$replace[] = 'url(' . $url . ')';
} elseif ($type == 'import') {
$replace[] = '@import "' . $url . '"';
}
}
// replace urls
$content = str_replace($search, $replace, $content);
return $content;
}
/**
* Shorthand hex color codes.
* #FF0000 -> #F00
*
* @param string $content The CSS content to shorten the hex color codes for.
* @return string
*/
protected function shortenHex($content)
{
$content = preg_replace('/(?<![\'"])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?![\'"])/i', '#$1$2$3', $content);
return $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)
{
// strip 0-digits (.0 -> 0, 50.00 -> 50)
// no risk of stripping selectors, a class name can't start with a digit
$content = preg_replace('/(?<![0-9])\.0+(?![1-9])/', '0', $content);
$content = preg_replace('/\.0+(?!0*[1-9])/', '', $content);
// strip negative zeroes (-0 -> 0)
$content = preg_replace('/(?<![0-9])-0+(?![\.1-9])/', '0', $content);
// strip units after zeroes (0px -> 0)
$units = array('em', 'ex', '%', 'px', 'cm', 'mm', 'in', 'pt', 'pc', 'ch', 'rem', 'vh', 'vw', 'vmin', 'vmax', 'vm');
$content = preg_replace('/(?<![0-9])0+(' . implode('|', $units) . ')/', '0', $content);
// truncate zeroes (00 -> 0) (can't be preceded by # for #000 colors)
// only before & after certain characters, to ensure we don't truncate
// zeroes in e.g. #000 or selectors
$content = preg_replace('/(?<=[ :\(])0+(?=[ :\)])/', '0', $content);
return $content;
}
/**
* Strip comments from source code.
*/
protected function stripComments()
{
$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 in selectors, like
// :nth-child(3+2n), not in things like calc(3px + 2px) or shorthands
// like 3px -2px
$content = preg_replace('/\s*([+-])\s*(?=[^}]*{)/', '$1', $content);
// remove semicolon/whitespace followed by closing bracket
$content = preg_replace('/;}/', '}', $content);
return trim($content);
}
}