private function CSSmin::minify in Advanced CSS/JS Aggregation 6
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()
- 7.2 advagg_css_compress/yui/CSSMin.inc \CSSmin::minify()
Does bulk of the minification
Parameters
string $css:
int|bool $linebreak_pos:
Return value
string
1 call to CSSmin::minify()
- CSSmin::run in advagg_css_compress/
yui/ CSSMin.inc - Minify a string of CSS
File
- advagg_css_compress/
yui/ CSSMin.inc, line 216
Class
Code
private function minify($css, $linebreak_pos) {
// strings are safe, now wrestle the comments
for ($i = 0, $max = count($this->comments); $i < $max; $i++) {
$token = $this->comments[$i];
$placeholder = '/' . self::COMMENT . $i . '___/';
// ! in the first position of the comment means preserve
// so push to the preserved tokens keeping the !
if (substr($token, 0, 1) === '!') {
$this->preserved_tokens[] = $token;
$token_tring = self::TOKEN . (count($this->preserved_tokens) - 1) . '___';
$css = preg_replace($placeholder, $token_tring, $css, 1);
// Preserve new lines for /*! important comments
$css = preg_replace('/\\s*[\\n\\r\\f]+\\s*(\\/\\*' . $token_tring . ')/S', self::NL . '$1', $css);
$css = preg_replace('/(' . $token_tring . '\\*\\/)\\s*[\\n\\r\\f]+\\s*/S', '$1' . self::NL, $css);
continue;
}
// \ in the last position looks like hack for Mac/IE5
// shorten that to /*\*/ and the next one to /**/
if (substr($token, strlen($token) - 1, 1) === '\\') {
$this->preserved_tokens[] = '\\';
$css = preg_replace($placeholder, self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
$i = $i + 1;
// attn: advancing the loop
$this->preserved_tokens[] = '';
$css = preg_replace('/' . self::COMMENT . $i . '___/', self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
continue;
}
// keep empty comments after child selectors (IE7 hack)
// e.g. html >/**/ body
if (strlen($token) === 0) {
$start_index = $this
->index_of($css, $this
->str_slice($placeholder, 1, -1));
if ($start_index > 2) {
if (substr($css, $start_index - 3, 1) === '>') {
$this->preserved_tokens[] = '';
$css = preg_replace($placeholder, self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
}
}
}
// in all other cases kill the comment
$css = preg_replace('/\\/\\*' . $this
->str_slice($placeholder, 1, -1) . '\\*\\//', '', $css, 1);
}
// Normalize all whitespace strings to single spaces. Easier to work with that way.
$css = preg_replace('/\\s+/', ' ', $css);
// Shorten & preserve calculations calc(...) since spaces are important
$css = preg_replace_callback('/calc(\\((?:[^\\(\\)]+|(?1))*\\))/i', array(
$this,
'replace_calc',
), $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('/(?:^|\\})(?:(?:[^\\{\\:])+\\:)+(?:[^\\{]*\\{)/', array(
$this,
'replace_colon',
), $css);
$css = preg_replace('/\\s+([\\!\\{\\}\\;\\:\\>\\+\\(\\)\\]\\~\\=,])/', '$1', $css);
$css = preg_replace('/' . self::CLASSCOLON . '/', ':', $css);
// retain space for special IE6 cases
$css = preg_replace('/\\:first\\-(line|letter)(\\{|,)/i', ':first-$1 $2', $css);
// no space after the end of a preserved comment
$css = preg_replace('/\\*\\/ /', '*/', $css);
// Put the space back in some cases, to support stuff like
// @media screen and (-webkit-min-device-pixel-ratio:0){
$css = preg_replace('/\\band\\(/i', 'and (', $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);
// Replace 0 length units 0(px,em,%) with 0.
$css = preg_replace('/((?<!\\\\)\\:|\\s)\\-?0(?:em|ex|ch|rem|vw|vh|vm|vmin|cm|mm|in|px|pt|pc|%)/iS', '${1}0', $css);
// Replace 0 0; or 0 0 0; or 0 0 0 0; with 0.
$css = preg_replace('/\\:0(?: 0){1,3}(;|\\})/', ':0$1', $css);
// Fix for issue: #2528142
// Replace text-shadow:0; with text-shadow:0 0 0;
$css = preg_replace('/(text-shadow\\:0)(;|\\})/ie', "strtolower('\$1 0 0\$2')", $css);
// Replace background-position:0; with background-position:0 0;
// same for transform-origin
$css = preg_replace('/(background\\-position|(?:webkit|moz|o|ms|)\\-?transform\\-origin)\\:0(;|\\})/ieS', "strtolower('\$1:0 0\$2')", $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,
'rgb_to_hex',
), $css);
$css = preg_replace_callback('/hsl\\s*\\(\\s*([0-9,\\s\\-\\.\\%]+)\\s*\\)(.{1})/i', array(
$this,
'hsl_to_hex',
), $css);
// Shorten colors from #AABBCC to #ABC or short color name.
$css = $this
->compress_hex_colors($css);
// border: none to border:0, outline: none to outline:0
$css = preg_replace('/(border\\-?(?:top|right|bottom|left|)|outline)\\:none(;|\\})/ieS', "strtolower('\$1:0\$2')", $css);
// shorter opacity IE filter
$css = preg_replace('/progid\\:DXImageTransform\\.Microsoft\\.Alpha\\(Opacity\\=/i', 'alpha(opacity=', $css);
// Remove empty rules.
$css = preg_replace('/[^\\};\\{\\/]+\\{\\}/S', '', $css);
// Some source control tools don't like it when files containing lines longer
// than, say 8000 characters, are checked in. The linebreak option is used in
// that case to split long lines after a specific column.
if ($linebreak_pos !== FALSE && (int) $linebreak_pos >= 0) {
$linebreak_pos = (int) $linebreak_pos;
$start_index = $i = 0;
while ($i < strlen($css)) {
$i++;
if ($css[$i - 1] === '}' && $i - $start_index > $linebreak_pos) {
$css = $this
->str_slice($css, 0, $i) . "\n" . $this
->str_slice($css, $i);
$start_index = $i;
}
}
}
// Replace multiple semi-colons in a row by a single one
// See SF bug #1980989
$css = preg_replace('/;;+/', ';', $css);
// Restore new lines for /*! important comments
$css = preg_replace('/' . self::NL . '/', "\n", $css);
// restore preserved comments and strings
for ($i = 0, $max = count($this->preserved_tokens); $i < $max; $i++) {
$css = preg_replace('/' . self::TOKEN . $i . '___/', $this->preserved_tokens[$i], $css, 1);
}
// Trim the final string (for any leading or trailing white spaces)
return trim($css);
}