/application/libraries/CSSmin.php
PHP | 741 lines | 437 code | 105 blank | 199 comment | 75 complexity | 127efe7e86f142ed5b773fd5fafee440 MD5 | raw file
Possible License(s): LGPL-2.1
- <?php
- /*!
- * cssmin.php rev 91c5ea5
- * Author: Tubal Martin - http://blog.margenn.com/
- * Repo: https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port
- *
- * This is a PHP port of the Javascript port of the CSS minification tool
- * distributed with YUICompressor, itself a port of the cssmin utility by
- * Isaac Schlueter - http://foohack.com/
- * Permission is hereby granted to use the PHP version under the same
- * conditions as the YUICompressor.
- */
- /*!
- * YUI Compressor
- * http://developer.yahoo.com/yui/compressor/
- * Author: Julien Lecomte - http://www.julienlecomte.net/
- * Copyright (c) 2011 Yahoo! Inc. All rights reserved.
- * The copyrights embodied in the content of this file are licensed
- * by Yahoo! Inc. under the BSD (revised) open source license.
- */
- 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;
- /**
- * Minify CSS
- *
- * @uses __construct()
- * @uses min()
- * @param string $js Javascript to be minified
- * @return string
- */
- public static function go($css) {
- $cssmin = new CSSMin();
- return $cssmin->run($css);
- }
- /**
- * @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;
- }
- }