class CSSmin in Advanced CSS/JS Aggregation 6
Same name and namespace in other branches
Hierarchy
- class \CSSmin
Expanded class hierarchy of CSSmin
File
- advagg_css_compress/
yui/ CSSMin.inc, line 24
View source
class CSSmin {
const NL = '___YUICSSMIN_PRESERVED_NL___';
const TOKEN = '___YUICSSMIN_PRESERVED_TOKEN_';
const COMMENT = '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_';
const CLASSCOLON = '___YUICSSMIN_PSEUDOCLASSCOLON___';
private $comments;
private $preserved_tokens;
private $memory_limit;
private $max_execution_time;
private $pcre_backtrack_limit;
private $pcre_recursion_limit;
private $raise_php_limits;
/**
* @param bool|int $raise_php_limits
* If true, PHP settings will be raised if needed
*/
public function __construct($raise_php_limits = TRUE) {
// Set suggested PHP limits
$this->memory_limit = 128 * 1048576;
// 128MB in bytes
$this->max_execution_time = 60;
// 1 min
$this->pcre_backtrack_limit = 1000 * 1000;
$this->pcre_recursion_limit = 500 * 1000;
$this->raise_php_limits = (bool) $raise_php_limits;
}
/**
* Minify a string of CSS
* @param string $css
* @param int|bool $linebreak_pos
* @return string
*/
public function run($css = '', $linebreak_pos = FALSE) {
if (empty($css)) {
return '';
}
if ($this->raise_php_limits) {
$this
->do_raise_php_limits();
}
$this->comments = array();
$this->preserved_tokens = array();
$start_index = 0;
$length = strlen($css);
$css = $this
->extract_data_urls($css);
// collect all comment blocks...
while (($start_index = $this
->index_of($css, '/*', $start_index)) >= 0) {
$end_index = $this
->index_of($css, '*/', $start_index + 2);
if ($end_index < 0) {
$end_index = $length;
}
$comment_found = $this
->str_slice($css, $start_index + 2, $end_index);
$this->comments[] = $comment_found;
$comment_preserve_string = self::COMMENT . (count($this->comments) - 1) . '___';
$css = $this
->str_slice($css, 0, $start_index + 2) . $comment_preserve_string . $this
->str_slice($css, $end_index);
// Set correct start_index: Fixes issue #2528130
$start_index = $end_index + 2 + strlen($comment_preserve_string) - strlen($comment_found);
}
// preserve strings so their content doesn't get accidentally minified
$css = preg_replace_callback('/(?:"(?:[^\\\\"]|\\\\.|\\\\)*")|' . "(?:'(?:[^\\\\']|\\\\.|\\\\)*')/S", array(
$this,
'replace_string',
), $css);
// Let's divide css code in chunks of 25.000 chars aprox.
// Reason: PHP's PCRE functions like preg_replace have a "backtrack limit"
// of 100.000 chars by default (php < 5.3.7) so if we're dealing with really
// long strings and a (sub)pattern matches a number of chars greater than
// the backtrack limit number (i.e. /(.*)/s) PCRE functions may fail silently
// returning NULL and $css would be empty.
$charset = '';
$charset_regexp = '/@charset [^;]+;/i';
$css_chunks = array();
$css_chunk_length = 25000;
// aprox size, not exact
$start_index = 0;
$i = $css_chunk_length;
// save initial iterations
$l = strlen($css);
// if the number of characters is 25000 or less, do not chunk
if ($l <= $css_chunk_length) {
$css_chunks[] = $css;
}
else {
// chunk css code securely
while ($i < $l) {
$i += 50;
// save iterations. 500 checks for a closing curly brace }
if ($l - $start_index <= $css_chunk_length || $i >= $l) {
$css_chunks[] = $this
->str_slice($css, $start_index);
break;
}
if ($css[$i - 1] === '}' && $i - $start_index > $css_chunk_length) {
// If there are two ending curly braces }} separated or not by spaces,
// join them in the same chunk (i.e. @media blocks)
$next_chunk = substr($css, $i);
if (preg_match('/^\\s*\\}/', $next_chunk)) {
$i = $i + $this
->index_of($next_chunk, '}') + 1;
}
$css_chunks[] = $this
->str_slice($css, $start_index, $i);
$start_index = $i;
}
}
}
// Minify each chunk
for ($i = 0, $n = count($css_chunks); $i < $n; $i++) {
$css_chunks[$i] = $this
->minify($css_chunks[$i], $linebreak_pos);
// Keep the first @charset at-rule found
if (empty($charset) && preg_match($charset_regexp, $css_chunks[$i], $matches)) {
$charset = $matches[0];
}
// Delete all @charset at-rules
$css_chunks[$i] = preg_replace($charset_regexp, '', $css_chunks[$i]);
}
// Update the first chunk and push the charset to the top of the file.
$css_chunks[0] = $charset . $css_chunks[0];
return implode('', $css_chunks);
}
/**
* Sets the memory limit for this script
* @param int|string $limit
*/
public function set_memory_limit($limit) {
$this->memory_limit = $this
->normalize_int($limit);
}
/**
* Sets the maximum execution time for this script
* @param int|string $seconds
*/
public function set_max_execution_time($seconds) {
$this->max_execution_time = (int) $seconds;
}
/**
* Sets the PCRE backtrack limit for this script
* @param int $limit
*/
public function set_pcre_backtrack_limit($limit) {
$this->pcre_backtrack_limit = (int) $limit;
}
/**
* Sets the PCRE recursion limit for this script
* @param int $limit
*/
public function set_pcre_recursion_limit($limit) {
$this->pcre_recursion_limit = (int) $limit;
}
/**
* Try to configure PHP to use at least the suggested minimum settings
*/
private function do_raise_php_limits() {
$php_limits = array(
'memory_limit' => $this->memory_limit,
'max_execution_time' => $this->max_execution_time,
'pcre.backtrack_limit' => $this->pcre_backtrack_limit,
'pcre.recursion_limit' => $this->pcre_recursion_limit,
);
// If current settings are higher respect them.
foreach ($php_limits as $name => $suggested) {
$current = $this
->normalize_int(ini_get($name));
// memory_limit exception: allow -1 for "no memory limit".
if ($current > -1 && ($suggested == -1 || $current < $suggested)) {
ini_set($name, $suggested);
}
}
}
/**
* Does bulk of the minification
* @param string $css
* @param int|bool $linebreak_pos
* @return string
*/
private function minify($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);
}
/**
* Utility method to replace all data urls with tokens before we start
* compressing, to avoid performance issues running some of the subsequent
* regexes against large strings chunks.
*
* @param string $css
* @return string
*/
private function extract_data_urls($css) {
// Leave data urls alone to increase parse performance.
$max_index = strlen($css) - 1;
$append_index = $index = $last_index = $offset = 0;
$sb = array();
$pattern = '/url\\(\\s*(["\']?)data\\:/i';
// Since we need to account for non-base64 data urls, we need to handle
// ' and ) being part of the data string. Hence switching to indexOf,
// to determine whether or not we have matching string terminators and
// handling sb appends directly, instead of using matcher.append* methods.
while (preg_match($pattern, $css, $m, 0, $offset)) {
$index = $this
->index_of($css, $m[0], $offset);
$last_index = $index + strlen($m[0]);
$start_index = $index + 4;
// "url(".length()
$end_index = $last_index - 1;
$terminator = $m[1];
// ', " or empty (not quoted)
$found_terminator = FALSE;
if (strlen($terminator) === 0) {
$terminator = ')';
}
while ($found_terminator === FALSE && $end_index + 1 <= $max_index) {
$end_index = $this
->index_of($css, $terminator, $end_index + 1);
// endIndex == 0 doesn't really apply here
if ($end_index > 0 && substr($css, $end_index - 1, 1) !== '\\') {
$found_terminator = TRUE;
if (')' != $terminator) {
$end_index = $this
->index_of($css, ')', $end_index);
}
}
}
// Enough searching, start moving stuff over to the buffer
$sb[] = $this
->substring($css, $append_index, $index);
if ($found_terminator) {
$token = $this
->substring($css, $start_index, $end_index);
$token = preg_replace('/\\s+/', '', $token);
$this->preserved_tokens[] = $token;
$preserver = 'url(' . self::TOKEN . (count($this->preserved_tokens) - 1) . '___)';
$sb[] = $preserver;
$append_index = $end_index + 1;
}
else {
// No end terminator found, re-add the whole match. Should we throw/warn here?
$sb[] = $this
->substring($css, $index, $last_index);
$append_index = $last_index;
}
$offset = $last_index;
}
$sb[] = $this
->substring($css, $append_index);
return implode('', $sb);
}
/**
* Utility method to compress hex color values of the form #AABBCC to #ABC or short color name.
*
* DOES NOT compress CSS ID selectors which match the above pattern (which would break things).
* e.g. #AddressForm { ... }
*
* DOES NOT compress IE filters, which have hex color values (which would break things).
* e.g. filter: chroma(color="#FFFFFF");
*
* DOES NOT compress invalid hex values.
* e.g. background-color: #aabbccdd
*
* @param string $css
* @return string
*/
private function compress_hex_colors($css) {
// Look for hex colors inside { ... } (to avoid IDs) and which don't have a =, or a " in front of them (to avoid filters)
$pattern = '/(\\=\\s*?["\']?)?#([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])(\\}|[^0-9a-f{][^{]*?\\})/iS';
$_index = $index = $last_index = $offset = 0;
$sb = array();
// See: http://ajaxmin.codeplex.com/wikipage?title=CSS%20Colors
$short_safe = array(
'#808080' => 'gray',
'#008000' => 'green',
'#800000' => 'maroon',
'#000080' => 'navy',
'#808000' => 'olive',
'#800080' => 'purple',
'#c0c0c0' => 'silver',
'#008080' => 'teal',
'#f00' => 'red',
);
while (preg_match($pattern, $css, $m, 0, $offset)) {
$index = $this
->index_of($css, $m[0], $offset);
$last_index = $index + strlen($m[0]);
$is_filter = (bool) $m[1];
$sb[] = $this
->substring($css, $_index, $index);
if ($is_filter) {
// Restore, maintain case, otherwise filter will break
$sb[] = $m[1] . '#' . $m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7];
}
else {
if (strtolower($m[2]) == strtolower($m[3]) && strtolower($m[4]) == strtolower($m[5]) && strtolower($m[6]) == strtolower($m[7])) {
// Compress.
$hex = '#' . strtolower($m[3] . $m[5] . $m[7]);
}
else {
// Non compressible color, restore but lower case.
$hex = '#' . strtolower($m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]);
}
// replace Hex colors to short safe color names
$sb[] = array_key_exists($hex, $short_safe) ? $short_safe[$hex] : $hex;
}
$_index = $offset = $last_index - strlen($m[8]);
}
$sb[] = $this
->substring($css, $_index);
return implode('', $sb);
}
/* CALLBACKS
* ---------------------------------------------------------------------------------------------
*/
private function replace_string($matches) {
$match = $matches[0];
$quote = substr($match, 0, 1);
// Must use addcslashes in PHP to avoid parsing of backslashes
$match = addcslashes($this
->str_slice($match, 1, -1), '\\');
// maybe the string contains a comment-like substring?
// one, maybe more? put'em back then
if (($pos = $this
->index_of($match, self::COMMENT)) >= 0) {
for ($i = 0, $max = count($this->comments); $i < $max; $i++) {
$match = preg_replace('/' . self::COMMENT . $i . '___/', $this->comments[$i], $match, 1);
}
}
// minify alpha opacity in filter strings
$match = preg_replace('/progid\\:DXImageTransform\\.Microsoft\\.Alpha\\(Opacity\\=/i', 'alpha(opacity=', $match);
$this->preserved_tokens[] = $match;
return $quote . self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . $quote;
}
private function replace_colon($matches) {
return preg_replace('/\\:/', self::CLASSCOLON, $matches[0]);
}
private function replace_calc($matches) {
$this->preserved_tokens[] = preg_replace('/\\s?([\\*\\/\\(\\),])\\s?/', '$1', $matches[0]);
return self::TOKEN . (count($this->preserved_tokens) - 1) . '___';
}
private function rgb_to_hex($matches) {
// Support for percentage values rgb(100%, 0%, 45%);
if ($this
->index_of($matches[1], '%') >= 0) {
$rgbcolors = explode(',', str_replace('%', '', $matches[1]));
for ($i = 0; $i < count($rgbcolors); $i++) {
$rgbcolors[$i] = $this
->round_number(floatval($rgbcolors[$i]) * 2.55);
}
}
else {
$rgbcolors = explode(',', $matches[1]);
}
// Values outside the sRGB color space should be clipped (0-255)
for ($i = 0; $i < count($rgbcolors); $i++) {
$rgbcolors[$i] = $this
->clamp_number(intval($rgbcolors[$i], 10), 0, 255);
$rgbcolors[$i] = sprintf("%02x", $rgbcolors[$i]);
}
// Fix for issue #2528093
if (!preg_match('/[\\s\\,\\);\\}]/', $matches[2])) {
$matches[2] = ' ' . $matches[2];
}
return '#' . implode('', $rgbcolors) . $matches[2];
}
private function hsl_to_hex($matches) {
$values = explode(',', str_replace('%', '', $matches[1]));
$h = floatval($values[0]);
$s = floatval($values[1]);
$l = floatval($values[2]);
// Wrap and clamp, then fraction!
$h = ($h % 360 + 360) % 360 / 360;
$s = $this
->clamp_number($s, 0, 100) / 100;
$l = $this
->clamp_number($l, 0, 100) / 100;
if ($s == 0) {
$r = $g = $b = $this
->round_number(255 * $l);
}
else {
$v2 = $l < 0.5 ? $l * (1 + $s) : $l + $s - $s * $l;
$v1 = 2 * $l - $v2;
$r = $this
->round_number(255 * $this
->hue_to_rgb($v1, $v2, $h + 1 / 3));
$g = $this
->round_number(255 * $this
->hue_to_rgb($v1, $v2, $h));
$b = $this
->round_number(255 * $this
->hue_to_rgb($v1, $v2, $h - 1 / 3));
}
return $this
->rgb_to_hex(array(
'',
$r . ',' . $g . ',' . $b,
$matches[2],
));
}
/* HELPERS
* ---------------------------------------------------------------------------------------------
*/
private function hue_to_rgb($v1, $v2, $vh) {
$vh = $vh < 0 ? $vh + 1 : ($vh > 1 ? $vh - 1 : $vh);
if ($vh * 6 < 1) {
return $v1 + ($v2 - $v1) * 6 * $vh;
}
if ($vh * 2 < 1) {
return $v2;
}
if ($vh * 3 < 2) {
return $v1 + ($v2 - $v1) * (2 / 3 - $vh) * 6;
}
return $v1;
}
private function round_number($n) {
return intval(floor(floatval($n) + 0.5), 10);
}
private function clamp_number($n, $min, $max) {
return min(max($n, $min), $max);
}
/**
* PHP port of Javascript's "indexOf" function for strings only
* Author: Tubal Martin http://blog.margenn.com
*
* @param string $haystack
* @param string $needle
* @param int $offset index (optional)
* @return int
*/
private function index_of($haystack, $needle, $offset = 0) {
$index = strpos($haystack, $needle, $offset);
return $index !== FALSE ? $index : -1;
}
/**
* PHP port of Javascript's "substring" function
* Author: Tubal Martin http://blog.margenn.com
* Tests: http://margenn.com/tubal/substring/
*
* @param string $str
* @param int $from index
* @param int|bool $to index (optional)
* @return string
*/
private function substring($str, $from = 0, $to = FALSE) {
if ($to !== FALSE) {
if ($from == $to || $from <= 0 && $to < 0) {
return '';
}
if ($from > $to) {
$from_copy = $from;
$from = $to;
$to = $from_copy;
}
}
if ($from < 0) {
$from = 0;
}
$substring = $to === FALSE ? substr($str, $from) : substr($str, $from, $to - $from);
return $substring === FALSE ? '' : $substring;
}
/**
* PHP port of Javascript's "slice" function for strings only
* Author: Tubal Martin http://blog.margenn.com
* Tests: http://margenn.com/tubal/str_slice/
*
* @param string $str
* @param int $start index
* @param int|bool $end index (optional)
* @return string
*/
private function str_slice($str, $start = 0, $end = FALSE) {
if ($end !== FALSE && ($start < 0 || $end <= 0)) {
$max = strlen($str);
if ($start < 0) {
if (($start = $max + $start) < 0) {
return '';
}
}
if ($end < 0) {
if (($end = $max + $end) < 0) {
return '';
}
}
if ($end <= $start) {
return '';
}
}
$slice = $end === FALSE ? substr($str, $start) : substr($str, $start, $end - $start);
return $slice === FALSE ? '' : $slice;
}
/**
* Convert strings like "64M" or "30" to int values
* @param mixed $size
* @return int
*/
private function normalize_int($size) {
if (is_string($size)) {
switch (substr($size, -1)) {
case 'M':
case 'm':
return $size * 1048576;
case 'K':
case 'k':
return $size * 1024;
case 'G':
case 'g':
return $size * 1073741824;
}
}
return (int) $size;
}
}Members
Name |
Modifiers | Type | Description | Overrides |
|---|---|---|---|---|
|
CSSmin:: |
private | property | ||
|
CSSmin:: |
private | property | ||
|
CSSmin:: |
private | property | ||
|
CSSmin:: |
private | property | ||
|
CSSmin:: |
private | property | ||
|
CSSmin:: |
private | property | ||
|
CSSmin:: |
private | property | ||
|
CSSmin:: |
private | function | ||
|
CSSmin:: |
constant | |||
|
CSSmin:: |
constant | |||
|
CSSmin:: |
private | function | Utility method to compress hex color values of the form #AABBCC to #ABC or short color name. | |
|
CSSmin:: |
private | function | Try to configure PHP to use at least the suggested minimum settings | |
|
CSSmin:: |
private | function | Utility method to replace all data urls with tokens before we start compressing, to avoid performance issues running some of the subsequent regexes against large strings chunks. | |
|
CSSmin:: |
private | function | ||
|
CSSmin:: |
private | function | ||
|
CSSmin:: |
private | function | PHP port of Javascript's "indexOf" function for strings only Author: Tubal Martin http://blog.margenn.com | |
|
CSSmin:: |
private | function | Does bulk of the minification | |
|
CSSmin:: |
constant | |||
|
CSSmin:: |
private | function | Convert strings like "64M" or "30" to int values | |
|
CSSmin:: |
private | function | ||
|
CSSmin:: |
private | function | ||
|
CSSmin:: |
private | function | ||
|
CSSmin:: |
private | function | ||
|
CSSmin:: |
private | function | ||
|
CSSmin:: |
public | function | Minify a string of CSS | |
|
CSSmin:: |
public | function | Sets the maximum execution time for this script | |
|
CSSmin:: |
public | function | Sets the memory limit for this script | |
|
CSSmin:: |
public | function | Sets the PCRE backtrack limit for this script | |
|
CSSmin:: |
public | function | Sets the PCRE recursion limit for this script | |
|
CSSmin:: |
private | function | PHP port of Javascript's "slice" function for strings only Author: Tubal Martin http://blog.margenn.com Tests: http://margenn.com/tubal/str_slice/ | |
|
CSSmin:: |
private | function | PHP port of Javascript's "substring" function Author: Tubal Martin http://blog.margenn.com Tests: http://margenn.com/tubal/substring/ | |
|
CSSmin:: |
constant | |||
|
CSSmin:: |
public | function |