FFFF minify/src/CSS.php at 1.3.7 · xerc/minify · GitHub
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// 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;
}
/**
5F91
* 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;
}
/**
* 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);
// remove semicolon/whitespace followed by closing bracket
$content = preg_replace('/;}/', '}', $content);
return trim($content);
}
}
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