private function CSSmin::minify in Advanced CSS/JS Aggregation 7.2
Same name and namespace in other branches
- 8.2 advagg_css_minify/yui/CSSMin.inc \CSSmin::minify()
- 8.3 advagg_css_minify/yui/CSSMin.inc \CSSmin::minify()
- 6 advagg_css_compress/yui/CSSMin.inc \CSSmin::minify()
Minifies the given input CSS string
Parameters
string $css:
int|bool $linebreakPos:
Return value
string
1 call to CSSmin::minify()
- CSSmin::run in advagg_css_compress/
yui/ CSSMin.inc - Minifies a string of CSS
File
- advagg_css_compress/
yui/ CSSMin.inc, line 323
Class
Code
private function minify($css, $linebreakPos) {
// Restore preserved at rule blocks
for ($i = 0, $max = count($this->atRuleBlocks); $i < $max; $i++) {
$css = preg_replace($this
->getAtRuleBlockPlaceholderRegexById($i), $this
->escapeReplacementString($this->atRuleBlocks[$i]), $css, 1);
}
// strings are safe, now wrestle the comments
for ($i = 0, $max = count($this->comments); $i < $max; $i++) {
$comment = $this->comments[$i];
$commentPlaceholder = $this
->getCommentPlaceholderById($i);
$commentPlaceholderRegex = $this
->getCommentPlaceholderRegexById($i);
// ! in the first position of the comment means preserve
// so push to the preserved tokens keeping the !
if (preg_match('/^!/', $comment)) {
$preservedTokenPlaceholder = $this
->registerPreservedToken($comment);
$css = preg_replace($commentPlaceholderRegex, $preservedTokenPlaceholder, $css, 1);
// Preserve new lines for /*! important comments
$css = preg_replace('/\\R+\\s*(\\/\\*' . $preservedTokenPlaceholder . ')/', self::NL . '$1', $css);
$css = preg_replace('/(' . $preservedTokenPlaceholder . '\\*\\/)\\s*\\R+/', '$1' . self::NL, $css);
continue;
}
// \ in the last position looks like hack for Mac/IE5
// shorten that to /*\*/ and the next one to /**/
if (preg_match('/\\\\$/', $comment)) {
$preservedTokenPlaceholder = $this
->registerPreservedToken('\\');
$css = preg_replace($commentPlaceholderRegex, $preservedTokenPlaceholder, $css, 1);
$i = $i + 1;
// attn: advancing the loop
$preservedTokenPlaceholder = $this
->registerPreservedToken('');
$css = preg_replace($this
->getCommentPlaceholderRegexById($i), $preservedTokenPlaceholder, $css, 1);
continue;
}
// keep empty comments after child selectors (IE7 hack)
// e.g. html >/**/ body
if (strlen($comment) === 0) {
$startIndex = $this
->indexOf($css, $commentPlaceholder);
if ($startIndex > 2) {
if (substr($css, $startIndex - 3, 1) === '>') {
$preservedTokenPlaceholder = $this
->registerPreservedToken('');
$css = preg_replace($commentPlaceholderRegex, $preservedTokenPlaceholder, $css, 1);
continue;
}
}
}
// in all other cases kill the comment
$css = preg_replace('/\\/\\*' . $commentPlaceholder . '\\*\\//', '', $css, 1);
}
// Normalize all whitespace strings to single spaces. Easier to work with that way.
$css = preg_replace('/\\s+/', ' ', $css);
// Remove spaces before & after newlines
$css = preg_replace('/\\s*' . self::NL . '\\s*/', self::NL, $css);
// Fix IE7 issue on matrix filters which browser accept whitespaces between Matrix parameters
$css = preg_replace_callback('/\\s*filter:\\s*progid:DXImageTransform\\.Microsoft\\.Matrix\\(([^)]+)\\)/', array(
$this,
'processOldIeSpecificMatrixDefinition',
), $css);
// Shorten & preserve calculations calc(...) since spaces are important
$css = preg_replace_callback('/calc(\\(((?:[^()]+|(?1))*)\\))/i', array(
$this,
'processCalc',
), $css);
// Replace positive sign from numbers preceded by : or a white-space before the leading space is removed
// +1.2em to 1.2em, +.8px to .8px, +2% to 2%
$css = preg_replace('/((?<!\\\\):|\\s)\\+(\\.?\\d+)/S', '$1$2', $css);
// Remove leading zeros from integer and float numbers preceded by : or a white-space
// 000.6 to .6, -0.8 to -.8, 0050 to 50, -01.05 to -1.05
$css = preg_replace('/((?<!\\\\):|\\s)(-?)0+(\\.?\\d+)/S', '$1$2$3', $css);
// Remove trailing zeros from float numbers preceded by : or a white-space
// -6.0100em to -6.01em, .0100 to .01, 1.200px to 1.2px
$css = preg_replace('/((?<!\\\\):|\\s)(-?)(\\d?\\.\\d+?)0+([^\\d])/S', '$1$2$3$4', $css);
// Remove trailing .0 -> -9.0 to -9
$css = preg_replace('/((?<!\\\\):|\\s)(-?\\d+)\\.0([^\\d])/S', '$1$2$3', $css);
// Replace 0 length numbers with 0
$css = preg_replace('/((?<!\\\\):|\\s)-?\\.?0+([^\\d])/S', '${1}0$2', $css);
// Remove the spaces before the things that should not have spaces before them.
// But, be careful not to turn "p :link {...}" into "p:link{...}"
// Swap out any pseudo-class colons with the token, and then swap back.
$css = preg_replace_callback('/(?:^|\\})[^{]*\\s+:/', array(
$this,
'processColon',
), $css);
// Remove spaces before the things that should not have spaces before them.
$css = preg_replace('/\\s+([!{};:>+()\\]~=,])/', '$1', $css);
// Restore spaces for !important
$css = preg_replace('/!important/i', ' !important', $css);
// bring back the colon
$css = preg_replace('/' . self::CLASSCOLON . '/', ':', $css);
// retain space for special IE6 cases
$css = preg_replace_callback('/:first-(line|letter)(\\{|,)/i', array(
$this,
'lowercasePseudoFirst',
), $css);
// no space after the end of a preserved comment
$css = preg_replace('/\\*\\/ /', '*/', $css);
// lowercase some popular @directives
$css = preg_replace_callback('/@(document|font-face|import|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?keyframes|media|namespace|page|' . 'supports|viewport)/i', array(
$this,
'lowercaseDirectives',
), $css);
// lowercase some more common pseudo-elements
$css = preg_replace_callback('/:(active|after|before|checked|disabled|empty|enabled|first-(?:child|of-type)|focus|hover|' . 'last-(?:child|of-type)|link|only-(?:child|of-type)|root|:selection|target|visited)/i', array(
$this,
'lowercasePseudoElements',
), $css);
// lowercase some more common functions
$css = preg_replace_callback('/:(lang|not|nth-child|nth-last-child|nth-last-of-type|nth-of-type|(?:-(?:moz|webkit)-)?any)\\(/i', array(
$this,
'lowercaseCommonFunctions',
), $css);
// lower case some common function that can be values
// NOTE: rgb() isn't useful as we replace with #hex later, as well as and() is already done for us
$css = preg_replace_callback('/([:,( ]\\s*)(attr|color-stop|from|rgba|to|url|-webkit-gradient|' . '(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?(?:calc|max|min|(?:repeating-)?(?:linear|radial)-gradient))/iS', array(
$this,
'lowercaseCommonFunctionsValues',
), $css);
// Put the space back in some cases, to support stuff like
// @media screen and (-webkit-min-device-pixel-ratio:0){
$css = preg_replace_callback('/(\\s|\\)\\s)(and|not|or)\\(/i', array(
$this,
'processAtRulesOperators',
), $css);
// Remove the spaces after the things that should not have spaces after them.
$css = preg_replace('/([!{}:;>+(\\[~=,])\\s+/S', '$1', $css);
// remove unnecessary semicolons
$css = preg_replace('/;+\\}/', '}', $css);
// Fix for issue: #2528146
// Restore semicolon if the last property is prefixed with a `*` (lte IE7 hack)
// to avoid issues on Symbian S60 3.x browsers.
$css = preg_replace('/(\\*[a-z0-9\\-]+\\s*:[^;}]+)(\\})/', '$1;$2', $css);
// Shorten zero values for safe properties only
$css = $this
->shortenZeroValues($css);
// Shorten font-weight values
$css = preg_replace('/(font-weight:)bold\\b/i', '${1}700', $css);
$css = preg_replace('/(font-weight:)normal\\b/i', '${1}400', $css);
// Shorten suitable shorthand properties with repeated non-zero values
$css = preg_replace('/(margin|padding):(' . $this->numRegex . ') (' . $this->numRegex . ') (?:\\2) (?:\\3)(;|\\}| !)/i', '$1:$2 $3$4', $css);
$css = preg_replace('/(margin|padding):(' . $this->numRegex . ') (' . $this->numRegex . ') (' . $this->numRegex . ') (?:\\3)(;|\\}| !)/i', '$1:$2 $3 $4$5', $css);
// 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.
$css = preg_replace_callback('/rgb\\s*\\(\\s*([0-9,\\s\\-.%]+)\\s*\\)(.{1})/i', array(
$this,
'rgbToHex',
), $css);
$css = preg_replace_callback('/hsl\\s*\\(\\s*([0-9,\\s\\-.%]+)\\s*\\)(.{1})/i', array(
$this,
'hslToHex',
), $css);
// Shorten colors from #AABBCC to #ABC or shorter color name.
$css = $this
->shortenHexColors($css);
// Shorten long named colors: white -> #fff.
$css = $this
->shortenNamedColors($css);
// shorter opacity IE filter
$css = preg_replace('/progid:DXImageTransform\\.Microsoft\\.Alpha\\(Opacity=/i', 'alpha(opacity=', $css);
// Find a fraction that is used for Opera's -o-device-pixel-ratio query
// Add token to add the "\" back in later
$css = preg_replace('/\\(([a-z\\-]+):([0-9]+)\\/([0-9]+)\\)/i', '($1:$2' . self::QUERY_FRACTION . '$3)', $css);
// Patch new lines to avoid being removed when followed by empty rules cases
$css = preg_replace('/' . self::NL . '/', self::NL . '}', $css);
// Remove empty rules.
$css = preg_replace('/[^{};\\/]+\\{\\}/S', '', $css);
// Restore new lines for /*! important comments
$css = preg_replace('/' . self::NL . '}/', "\n", $css);
// Add "/" back to fix Opera -o-device-pixel-ratio query
$css = preg_replace('/' . self::QUERY_FRACTION . '/', '/', $css);
// Replace multiple semi-colons in a row by a single one
// See SF bug #1980989
$css = preg_replace('/;;+/', ';', $css);
// Lowercase all uppercase properties
$css = preg_replace_callback('/(\\{|;)([A-Z\\-]+)(:)/', array(
$this,
'lowercaseProperties',
), $css);
// Some source control tools don't like it when files containing lines longer
// than, say 8000 characters, are checked in. The linebreak option is used in
// that case to split long lines after a specific column.
if ($linebreakPos !== false && (int) $linebreakPos >= 0) {
$linebreakPos = (int) $linebreakPos;
for ($startIndex = $i = 1, $l = strlen($css); $i < $l; $i++) {
if ($css[$i - 1] === '}' && $i - $startIndex > $linebreakPos) {
$css = $this
->strSlice($css, 0, $i) . "\n" . $this
->strSlice($css, $i);
$l = strlen($css);
$startIndex = $i;
}
}
}
// restore preserved comments and strings in reverse order
for ($i = count($this->preservedTokens) - 1; $i >= 0; $i--) {
$css = preg_replace($this
->getPreservedTokenPlaceholderRegexById($i), $this
->escapeReplacementString($this->preservedTokens[$i]), $css, 1);
}
// Trim the final string for any leading or trailing white space but respect newlines!
$css = preg_replace('/(^ | $)/', '', $css);
return $css;
}