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csslib.php
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csslib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* This file contains CSS related class, and function for the CSS optimiser
*
* Please see the {@see css_optimiser} class for greater detail.
*
* @package core_css
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
//NOTE: do not verify MOODLE_INTERNAL here, this is used from themes too
/**
* Stores CSS in a file at the given path.
*
* This function either succeeds or throws an exception.
*
* @param theme_config $theme The theme that the CSS belongs to.
* @param string $csspath The path to store the CSS at.
* @param array $cssfiles The CSS files to store.
*/
function css_store_css(theme_config $theme, $csspath, array $cssfiles) {
global $CFG;
if (!empty($CFG->enablecssoptimiser)) {
// This is an experimental feature introduced in Moodle 2.3
// The CSS optimiser organises the CSS in order to reduce the overall number
// of rules and styles being sent to the client. It does this by collating
// the CSS before it is cached removing excess styles and rules and stripping
// out any extraneous content such as comments and empty rules.
$optimiser = new css_optimiser;
$css = '';
foreach ($cssfiles as $file) {
$css .= file_get_contents($file)."\n";
}
$css = $theme->post_process($css);
$css = $optimiser->process($css);
// If cssoptimisestats is set then stats from the optimisation are collected
// and output at the beginning of the CSS
if (!empty($CFG->cssoptimiserstats)) {
$css = $optimiser->output_stats_css().$css;
}
} else {
// This is the default behaviour.
// The cssoptimise setting was introduced in Moodle 2.3 and will hopefully
// in the future be changed from an experimental setting to the default.
// The css_minify_css will method will use the Minify library remove
// comments, additional whitespace and other minor measures to reduce the
// the overall CSS being sent.
// However it has the distinct disadvantage of having to minify the CSS
// before running the post process functions. Potentially things may break
// here if theme designers try to push things with CSS post processing.
$css = $theme->post_process(css_minify_css($cssfiles));
}
clearstatcache();
if (!file_exists(dirname($csspath))) {
@mkdir(dirname($csspath), $CFG->directorypermissions, true);
}
// Prevent serving of incomplete file from concurrent request,
// the rename() should be more atomic than fwrite().
ignore_user_abort(true);
if ($fp = fopen($csspath.'.tmp', 'xb')) {
fwrite($fp, $css);
fclose($fp);
rename($csspath.'.tmp', $csspath);
@chmod($csspath, $CFG->filepermissions);
@unlink($csspath.'.tmp'); // just in case anything fails
}
ignore_user_abort(false);
if (connection_aborted()) {
die;
}
}
/**
* Sends IE specific CSS
*
* In writing the CSS parser I have a theory that we could optimise the CSS
* then split it based upon the number of selectors to ensure we dont' break IE
* and that we include only as many sub-stylesheets as we require.
* Of course just a theory but may be fun to code.
*
* @param string $themename The name of the theme we are sending CSS for.
* @param string $rev The revision to ensure we utilise the cache.
* @param string $etag The revision to ensure we utilise the cache.
* @param bool $slasharguments
*/
function css_send_ie_css($themename, $rev, $etag, $slasharguments) {
global $CFG;
$lifetime = 60*60*24*60; // 60 days only - the revision may get incremented quite often
$relroot = preg_replace('|^http.?://[^/]+|', '', $CFG->wwwroot);
$css = "/** Unfortunately IE6/7 does not support more than 4096 selectors in one CSS file, which means we have to use some ugly hacks :-( **/";
if ($slasharguments) {
$css .= "\n@import url($relroot/styles.php/$themename/$rev/plugins);";
$css .= "\n@import url($relroot/styles.php/$themename/$rev/parents);";
$css .= "\n@import url($relroot/styles.php/$themename/$rev/theme);";
} else {
$css .= "\n@import url($relroot/styles.php?theme=$themename&rev=$rev&type=plugins);";
$css .= "\n@import url($relroot/styles.php?theme=$themename&rev=$rev&type=parents);";
$css .= "\n@import url($relroot/styles.php?theme=$themename&rev=$rev&type=theme);";
}
header('Etag: '.$etag);
header('Content-Disposition: inline; filename="styles.php"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
header('Cache-Control: public, max-age='.$lifetime);
header('Accept-Ranges: none');
header('Content-Type: text/css; charset=utf-8');
header('Content-Length: '.strlen($css));
echo $css;
die;
}
/**
* Sends a cached CSS file
*
* This function sends the cached CSS file. Remember it is generated on the first
* request, then optimised/minified, and finally cached for serving.
*
* @param string $csspath The path to the CSS file we want to serve.
* @param string $etag The revision to make sure we utilise any caches.
*/
function css_send_cached_css($csspath, $etag) {
$lifetime = 60*60*24*60; // 60 days only - the revision may get incremented quite often
header('Etag: '.$etag);
header('Content-Disposition: inline; filename="styles.php"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($csspath)) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
header('Cache-Control: public, max-age='.$lifetime);
header('Accept-Ranges: none');
header('Content-Type: text/css; charset=utf-8');
if (!min_enable_zlib_compression()) {
header('Content-Length: '.filesize($csspath));
}
readfile($csspath);
die;
}
/**
* Sends CSS directly without caching it.
*
* This function takes a raw CSS string, optimises it if required, and then
* serves it.
* Turning both themedesignermode and CSS optimiser on at the same time is aweful
* for performance because of the optimiser running here. However it was done so
* that theme designers could utilise the optimised output during development to
* help them optimise their CSS... not that they should write lazy CSS.
*
* @param string CSS
*/
function css_send_uncached_css($css) {
global $CFG;
header('Content-Disposition: inline; filename="styles_debug.php"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + THEME_DESIGNER_CACHE_LIFETIME) .' GMT');
header('Pragma: ');
header('Accept-Ranges: none');
header('Content-Type: text/css; charset=utf-8');
if (is_array($css)) {
$css = implode("\n\n", $css);
}
if (!empty($CFG->enablecssoptimiser)) {
$css = str_replace("\n", "\r\n", $css);
$optimiser = new css_optimiser;
$css = $optimiser->process($css);
if (!empty($CFG->cssoptimiserstats)) {
$css = $optimiser->output_stats_css().$css;
}
}
echo $css;
die;
}
/**
* Send file not modified headers
* @param int $lastmodified
* @param string $etag
*/
function css_send_unmodified($lastmodified, $etag) {
$lifetime = 60*60*24*60; // 60 days only - the revision may get incremented quite often
header('HTTP/1.1 304 Not Modified');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Cache-Control: public, max-age='.$lifetime);
header('Content-Type: text/css; charset=utf-8');
header('Etag: '.$etag);
if ($lastmodified) {
header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
}
die;
}
/**
* Sends a 404 message about CSS not being found.
*/
function css_send_css_not_found() {
header('HTTP/1.0 404 not found');
die('CSS was not found, sorry.');
}
/**
* Uses the minify library to compress CSS.
*
* This is used if $CFG->enablecssoptimiser has been turned off. This was
* the original CSS optimisation library.
* It removes whitespace and shrinks things but does no apparent optimisation.
* Note the minify library is still being used for JavaScript.
*
* @param array $files An array of files to minify
* @return string The minified CSS
*/
function css_minify_css($files) {
global $CFG;
if (empty($files)) {
return '';
}
set_include_path($CFG->libdir . '/minify/lib' . PATH_SEPARATOR . get_include_path());
require_once('Minify.php');
if (0 === stripos(PHP_OS, 'win')) {
Minify::setDocRoot(); // IIS may need help
}
// disable all caching, we do it in moodle
Minify::setCache(null, false);
$options = array(
'bubbleCssImports' => false,
// Don't gzip content we just want text for storage
'encodeOutput' => false,
// Maximum age to cache, not used but required
'maxAge' => (60*60*24*20),
// The files to minify
'files' => $files,
// Turn orr URI rewriting
'rewriteCssUris' => false,
// This returns the CSS rather than echoing it for display
'quiet' => true
);
$error = 'unknown';
try {
$result = Minify::serve('Files', $options);
if ($result['success']) {
return $result['content'];
}
} catch (Exception $e) {
$error = $e->getMessage();
$error = str_replace("\r", ' ', $error);
$error = str_replace("\n", ' ', $error);
}
// minification failed - try to inform the theme developer and include the non-minified version
$css = <<<EOD
/* Error: $error */
/* Problem detected during theme CSS minimisation, please review the following code */
/* ================================================================================ */
EOD;
foreach ($files as $cssfile) {
$css .= file_get_contents($cssfile)."\n";
}
return $css;
}
/**
* Determines if the given value is a valid CSS colour.
*
* A CSS colour can be one of the following:
* - Hex colour: #AA66BB
* - RGB colour: rgb(0-255, 0-255, 0-255)
* - RGBA colour: rgba(0-255, 0-255, 0-255, 0-1)
* - HSL colour: hsl(0-360, 0-100%, 0-100%)
* - HSLA colour: hsla(0-360, 0-100%, 0-100%, 0-1)
*
* Or a recognised browser colour mapping {@see css_optimiser::$htmlcolours}
*
* @param string $value The colour value to check
* @return bool
*/
function css_is_colour($value) {
$value = trim($value);
if (in_array(strtolower($value), array('inherit'))) {
return true;
} else if (preg_match('/^#([a-fA-F0-9]{1,3}|[a-fA-F0-9]{6})$/', $value)) {
return true;
} else if (in_array(strtolower($value), array_keys(css_optimiser::$htmlcolours))) {
return true;
} else if (preg_match('#^rgb\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)$#i', $value, $m) && $m[1] < 256 && $m[2] < 256 && $m[3] < 256) {
// It is an RGB colour
return true;
} else if (preg_match('#^rgba\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1}(\.\d+)?)\s*\)$#i', $value, $m) && $m[1] < 256 && $m[2] < 256 && $m[3] < 256) {
// It is an RGBA colour
return true;
} else if (preg_match('#^hsl\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\%\s*,\s*(\d{1,3})\%\s*\)$#i', $value, $m) && $m[1] <= 360 && $m[2] <= 100 && $m[3] <= 100) {
// It is an HSL colour
return true;
} else if (preg_match('#^hsla\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\%\s*,\s*(\d{1,3})\%\s*,\s*(\d{1}(\.\d+)?)\s*\)$#i', $value, $m) && $m[1] <= 360 && $m[2] <= 100 && $m[3] <= 100) {
// It is an HSLA colour
return true;
}
// Doesn't look like a colour.
return false;
}
/**
* Returns true is the passed value looks like a CSS width.
* In order to pass this test the value must be purely numerical or end with a
* valid CSS unit term.
*
* @param string|int $value
* @return boolean
*/
function css_is_width($value) {
$value = trim($value);
if (in_array(strtolower($value), array('auto', 'inherit'))) {
return true;
}
if ((string)$value === '0' || preg_match('#^(\-\s*)?(\d*\.)?(\d+)\s*(em|px|pt|\%|in|cm|mm|ex|pc)$#i', $value)) {
return true;
}
return false;
}
/**
* A simple sorting function to sort two array values on the number of items they contain
*
* @param array $a
* @param array $b
* @return int
*/
function css_sort_by_count(array $a, array $b) {
$a = count($a);
$b = count($b);
if ($a == $b) {
return 0;
}
return ($a > $b) ? -1 : 1;
}
/**
* A basic CSS optimiser that strips out unwanted things and then processing the
* CSS organising styles and moving duplicates and useless CSS.
*
* This CSS optimiser works by reading through a CSS string one character at a
* time and building an object structure of the CSS.
* As part of that processing styles are expanded out as much as they can be to
* ensure we collect all mappings, at the end of the processing those styles are
* then combined into an optimised form to keep them as short as possible.
*
* @package core_css
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_optimiser {
/**
* Used when the processor is about to start processing.
* Processing states. Used internally.
*/
const PROCESSING_START = 0;
/**
* Used when the processor is currently processing a selector.
* Processing states. Used internally.
*/
const PROCESSING_SELECTORS = 0;
/**
* Used when the processor is currently processing a style.
* Processing states. Used internally.
*/
const PROCESSING_STYLES = 1;
/**
* Used when the processor is currently processing a comment.
* Processing states. Used internally.
*/
const PROCESSING_COMMENT = 2;
/**
* Used when the processor is currently processing an @ rule.
* Processing states. Used internally.
*/
const PROCESSING_ATRULE = 3;
/**
* The raw string length before optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $rawstrlen = 0;
/**
* The number of comments that were removed during optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $commentsincss = 0;
/**
* The number of rules in the CSS before optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $rawrules = 0;
/**
* The number of selectors using in CSS rules before optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $rawselectors = 0;
/**
* The string length after optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $optimisedstrlen = 0;
/**
* The number of rules after optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $optimisedrules = 0;
/**
* The number of selectors used in rules after optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $optimisedselectors = 0;
/**
* The start time of the optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $timestart = 0;
/**
* The end time of the optimisation.
* Stats variables set during and after processing
* @var int
*/
protected $timecomplete = 0;
/**
* Will be set to any errors that may have occured during processing.
* This is updated only at the end of processing NOT during.
*
* @var array
*/
protected $errors = array();
/**
* Processes incoming CSS optimising it and then returning it.
*
* @param string $css The raw CSS to optimise
* @return string The optimised CSS
*/
public function process($css) {
global $CFG;
$css = trim($css);
$this->reset_stats();
$this->timestart = microtime(true);
$this->rawstrlen = strlen($css);
if ($this->rawstrlen === 0) {
$this->errors[] = 'Skipping file as it has no content.';
return '';
}
// First up we need to remove all line breaks - this allows us to instantly
// reduce our processing requirements and as we will process everything
// into a new structure there's really nothing lost.
$css = preg_replace('#\r?\n#', ' ', $css);
// Next remove the comments... no need to them in an optimised world and
// knowing they're all gone allows us to REALLY make our processing simpler
$css = preg_replace('#/\*(.*?)\*/#m', '', $css, -1, $this->commentsincss);
$medias = array(
'all' => new css_media()
);
$imports = array();
$charset = false;
// Keyframes are used for CSS animation they will be processed right at the very end.
$keyframes = array();
$currentprocess = self::PROCESSING_START;
$currentrule = css_rule::init();
$currentselector = css_selector::init();
$inquotes = false; // ' or "
$inbraces = false; // {
$inbrackets = false; // [
$inparenthesis = false; // (
$currentmedia = $medias['all'];
$currentatrule = null;
$suspectatrule = false;
$buffer = '';
$char = null;
// Next we are going to iterate over every single character in $css.
// This is why we removed line breaks and comments!
for ($i = 0; $i < $this->rawstrlen; $i++) {
$lastchar = $char;
$char = substr($css, $i, 1);
if ($char == '@' && $buffer == '') {
$suspectatrule = true;
}
switch ($currentprocess) {
// Start processing an at rule e.g. @media, @page
case self::PROCESSING_ATRULE:
switch ($char) {
case ';':
if (!$inbraces) {
$buffer .= $char;
if ($currentatrule == 'import') {
$imports[] = $buffer;
$currentprocess = self::PROCESSING_SELECTORS;
} else if ($currentatrule == 'charset') {
$charset = $buffer;
$currentprocess = self::PROCESSING_SELECTORS;
}
}
if ($currentatrule !== 'media') {
$buffer = '';
$currentatrule = false;
}
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '{':
if ($currentatrule == 'media' && preg_match('#\s*@media\s*([a-zA-Z0-9]+(\s*,\s*[a-zA-Z0-9]+)*)\s*{#', $buffer, $matches)) {
// Basic media declaration
$mediatypes = str_replace(' ', '', $matches[1]);
if (!array_key_exists($mediatypes, $medias)) {
$medias[$mediatypes] = new css_media($mediatypes);
}
$currentmedia = $medias[$mediatypes];
$currentprocess = self::PROCESSING_SELECTORS;
$buffer = '';
} else if ($currentatrule == 'media' && preg_match('#\s*@media\s*([^{]+)#', $buffer, $matches)) {
// Advanced media query declaration http://www.w3.org/TR/css3-mediaqueries/
$mediatypes = $matches[1];
$hash = md5($mediatypes);
$medias[$hash] = new css_media($mediatypes);
$currentmedia = $medias[$hash];
$currentprocess = self::PROCESSING_SELECTORS;
$buffer = '';
} else if ($currentatrule == 'keyframes' && preg_match('#@((\-moz\-|\-webkit\-)?keyframes)\s*([^\s]+)#', $buffer, $matches)) {
$keyframefor = $matches[1];
$keyframename = $matches[3];
$keyframe = new css_keyframe($keyframefor, $keyframename);
$keyframes[] = $keyframe;
$currentmedia = $keyframe;
$currentprocess = self::PROCESSING_SELECTORS;
$buffer = '';
}
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
// Start processing selectors
case self::PROCESSING_START:
case self::PROCESSING_SELECTORS:
switch ($char) {
case '[':
$inbrackets ++;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ']':
$inbrackets --;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ' ':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
if (!empty($buffer)) {
if ($suspectatrule && preg_match('#@(media|import|charset|(\-moz\-|\-webkit\-)?(keyframes))\s*#', $buffer, $matches)) {
$currentatrule = (!empty($matches[3]))?$matches[3]:$matches[1];
$currentprocess = self::PROCESSING_ATRULE;
$buffer .= $char;
} else {
$currentselector->add($buffer);
$buffer = '';
}
}
$suspectatrule = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '{':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
if ($buffer !== '') {
$currentselector->add($buffer);
}
$currentrule->add_selector($currentselector);
$currentselector = css_selector::init();
$currentprocess = self::PROCESSING_STYLES;
$buffer = '';
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '}':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
if ($currentatrule == 'media') {
$currentmedia = $medias['all'];
$currentatrule = false;
$buffer = '';
} else if (strpos($currentatrule, 'keyframes') !== false) {
$currentmedia = $medias['all'];
$currentatrule = false;
$buffer = '';
}
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ',':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
$currentselector->add($buffer);
$currentrule->add_selector($currentselector);
$currentselector = css_selector::init();
$buffer = '';
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
// Start processing styles
case self::PROCESSING_STYLES:
if ($char == '"' || $char == "'") {
if ($inquotes === false) {
$inquotes = $char;
}
if ($inquotes === $char && $lastchar !== '\\') {
$inquotes = false;
}
}
if ($inquotes) {
$buffer .= $char;
continue 2;
}
switch ($char) {
case ';':
if ($inparenthesis) {
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
$currentrule->add_style($buffer);
$buffer = '';
$inquotes = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '}':
$currentrule->add_style($buffer);
$this->rawselectors += $currentrule->get_selector_count();
$currentmedia->add_rule($currentrule);
$currentrule = css_rule::init();
$currentprocess = self::PROCESSING_SELECTORS;
$this->rawrules++;
$buffer = '';
$inquotes = false;
$inparenthesis = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '(':
$inparenthesis = true;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ')':
$inparenthesis = false;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
}
$buffer .= $char;
}
$css = '';
if (!empty($charset)) {
$imports[] = $charset;
}
if (!empty($imports)) {
$css .= implode("\n", $imports);
$css .= "\n\n";
}
foreach ($medias as $media) {
$media->organise_rules_by_selectors();
$this->optimisedrules += $media->count_rules();
$this->optimisedselectors += $media->count_selectors();
if ($media->has_errors()) {
$this->errors += $media->get_errors();
}
if (in_array('all', $media->get_types())) {
$resetrules = $media->get_reset_rules(true);
if (!empty($resetrules)) {
$css .= css_writer::media('all', $resetrules);
}
}
}
foreach ($medias as $media) {
$css .= $media->out();
}
if (count($keyframes) > 0) {
$css .= "\n";
foreach ($keyframes as $keyframe) {
$this->optimisedrules += $keyframe->count_rules();
$this->optimisedselectors += $keyframe->count_selectors();
if ($keyframe->has_errors()) {
$this->errors += $keyframe->get_errors();
}
$css .= $keyframe->out();
}
}
$this->optimisedstrlen = strlen($css);
$this->timecomplete = microtime(true);
return trim($css);
}
/**
* Returns an array of stats from the last processing run
* @return string
*/
public function get_stats() {
$stats = array(
'timestart' => $this->timestart,
'timecomplete' => $this->timecomplete,
'timetaken' => round($this->timecomplete - $this->timestart, 4),
'commentsincss' => $this->commentsincss,
'rawstrlen' => $this->rawstrlen,
'rawselectors' => $this->rawselectors,
'rawrules' => $this->rawrules,
'optimisedstrlen' => $this->optimisedstrlen,
'optimisedrules' => $this->optimisedrules,
'optimisedselectors' => $this->optimisedselectors,
'improvementstrlen' => '-',
'improvementrules' => '-',
'improvementselectors' => '-',
);
if ($this->rawstrlen > 0) {
$stats['improvementstrlen'] = round(100 - ($this->optimisedstrlen / $this->rawstrlen) * 100, 1).'%';
}
if ($this->rawrules > 0) {
$stats['improvementrules'] = round(100 - ($this->optimisedrules / $this->rawrules) * 100, 1).'%';
}
if ($this->rawselectors > 0) {
$stats['improvementselectors'] = round(100 - ($this->optimisedselectors / $this->rawselectors) * 100, 1).'%';
}
return $stats;
}
/**
* Returns true if any errors have occured during processing
*
* @return bool
*/
public function has_errors() {
return !empty($this->errors);
}
/**
* Returns an array of errors that have occured
*
* @param bool $clear If set to true the errors will be cleared after being returned.
* @return array
*/
public function get_errors($clear = false) {
$errors = $this->errors;
if ($clear) {
// Reset the error array
$this->errors = array();
}
return $errors;
}
/**
* Returns any errors as a string that can be included in CSS.
*
* @return string
*/
public function output_errors_css() {
$computedcss = "/****************************************\n";
$computedcss .= " *--- Errors found during processing ----\n";
foreach ($this->errors as $error) {
$computedcss .= preg_replace('#^#m', '* ', $error);
}
$computedcss .= " ****************************************/\n\n";
return $computedcss;
}
/**
* Returns a string to display stats about the last generation within CSS output
*
* @return string
*/
public function output_stats_css() {
$computedcss = "/****************************************\n";
$computedcss .= " *------- CSS Optimisation stats --------\n";
if ($this->rawstrlen === 0) {
$computedcss .= " File not processed as it has no content /\n\n";
$computedcss .= " ****************************************/\n\n";
return $computedcss;
} else if ($this->rawrules === 0) {
$computedcss .= " File contained no rules to be processed /\n\n";
$computedcss .= " ****************************************/\n\n";
return $computedcss;
}
$stats = $this->get_stats();
$computedcss .= " * ".date('r')."\n";
$computedcss .= " * {$stats['commentsincss']} \t comments removed\n";
$computedcss .= " * Optimisation took {$stats['timetaken']} seconds\n";
$computedcss .= " *--------------- before ----------------\n";
$computedcss .= " * {$stats['rawstrlen']} \t chars read in\n";
$computedcss .= " * {$stats['rawrules']} \t rules read in\n";
$computedcss .= " * {$stats['rawselectors']} \t total selectors\n";
$computedcss .= " *---------------- after ----------------\n";
$computedcss .= " * {$stats['optimisedstrlen']} \t chars once optimized\n";
$computedcss .= " * {$stats['optimisedrules']} \t optimized rules\n";
$computedcss .= " * {$stats['optimisedselectors']} \t total selectors once optimized\n";
$computedcss .= " *---------------- stats ----------------\n";
$computedcss .= " * {$stats['improvementstrlen']} \t reduction in chars\n";
$computedcss .= " * {$stats['improvementrules']} \t reduction in rules\n";
$computedcss .= " * {$stats['improvementselectors']} \t reduction in selectors\n";
$computedcss .= " ****************************************/\n\n";
return $computedcss;
}
/**
* Resets the stats ready for another fresh processing
*/
public function reset_stats() {
$this->commentsincss = 0;
$this->optimisedrules = 0;
$this->optimisedselectors = 0;
$this->optimisedstrlen = 0;
$this->rawrules = 0;
$this->rawselectors = 0;
$this->rawstrlen = 0;
$this->timecomplete = 0;
$this->timestart = 0;
}
/**
* An array of the common HTML colours that are supported by most browsers.
*
* This reference table is used to allow us to unify colours, and will aid
* us in identifying buggy CSS using unsupported colours.
*
* @staticvar array
* @var array
*/
public static $htmlcolours = array(
'aliceblue' => '#F0F8FF',
'antiquewhite' => '#FAEBD7',
'aqua' => '#00FFFF',
'aquamarine' => '#7FFFD4',
'azure' => '#F0FFFF',
'beige' => '#F5F5DC',
'bisque' => '#FFE4C4',
'black' => '#000000',
'blanchedalmond' => '#FFEBCD',
'blue' => '#0000FF',
'blueviolet' => '#8A2BE2',
'brown' => '#A52A2A',
'burlywood' => '#DEB887',
'cadetblue' => '#5F9EA0',
'chartreuse' => '#7FFF00',
'chocolate' => '#D2691E',
'coral' => '#FF7F50',
'cornflowerblue' => '#6495ED',
'cornsilk' => '#FFF8DC',
'crimson' => '#DC143C',
'cyan' => '#00FFFF',
'darkblue' => '#00008B',
'darkcyan' => '#008B8B',
'darkgoldenrod' => '#B8860B',
'darkgray' => '#A9A9A9',
'darkgrey' => '#A9A9A9',
'darkgreen' => '#006400',
'darkKhaki' => '#BDB76B',
'darkmagenta' => '#8B008B',
'darkolivegreen' => '#556B2F',
'arkorange' => '#FF8C00',
'darkorchid' => '#9932CC',
'darkred' => '#8B0000',
'darksalmon' => '#E9967A',
'darkseagreen' => '#8FBC8F',
'darkslateblue' => '#483D8B',
'darkslategray' => '#2F4F4F',
'darkslategrey' => '#2F4F4F',
'darkturquoise' => '#00CED1',
'darkviolet' => '#9400D3',
'deeppink' => '#FF1493',
'deepskyblue' => '#00BFFF',
'dimgray' => '#696969',
'dimgrey' => '#696969',
'dodgerblue' => '#1E90FF',