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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 {@link css_optimiser} class for greater detail.
*
* @package core
* @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 $CFG;
// Check if both the CSS optimiser is enabled and the theme supports it.
if (!empty($CFG->enablecssoptimiser) && $theme->supportscssoptimisation) {
// 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 awful
* 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, $themesupportsoptimisation = true) {
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);
}
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 $css;
}
/**
* Determines if the given value is a valid CSS colour.
*
* A CSS colour can be one of the following:
* - Hex colour: #AA66BB
* - RGB colour: rgb(0-255, 0-255, 0-255)
* - RGBA colour: rgba(0-255, 0-255, 0-255, 0-1)
* - HSL colour: hsl(0-360, 0-100%, 0-100%)
* - HSLA colour: hsla(0-360, 0-100%, 0-100%, 0-1)
*
* Or a recognised browser colour mapping {@link css_optimiser::$htmlcolours}
*
* @param string $value The colour value to check
* @return bool
*/
function css_is_colour($value) {
$value = trim($value);
$hex = '/^#([a-fA-F0-9]{1,3}|[a-fA-F0-9]{6})$/';
$rgb = '#^rgb\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)$#i';
$rgba = '#^rgba\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1}(\.\d+)?)\s*\)$#i';
$hsl = '#^hsl\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\%\s*,\s*(\d{1,3})\%\s*\)$#i';
$hsla = '#^hsla\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\%\s*,\s*(\d{1,3})\%\s*,\s*(\d{1}(\.\d+)?)\s*\)$#i';
if (in_array(strtolower($value), array('inherit'))) {
return true;
} else if (preg_match($hex, $value)) {
return true;
} else if (in_array(strtolower($value), array_keys(css_optimiser::$htmlcolours))) {
return true;
} else if (preg_match($rgb, $value, $m) && $m[1] < 256 && $m[2] < 256 && $m[3] < 256) {
// It is an RGB colour
return true;
} else if (preg_match($rgba, $value, $m) && $m[1] < 256 && $m[2] < 256 && $m[3] < 256) {
// It is an RGBA colour
return true;
} else if (preg_match($hsl, $value, $m) && $m[1] <= 360 && $m[2] <= 100 && $m[3] <= 100) {
// It is an HSL colour
return true;
} else if (preg_match($hsla, $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
* @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;
// Easiest win there is
$css = trim($css);
$this->reset_stats();
$this->timestart = microtime(true);
$this->rawstrlen = strlen($css);
// Don't try to process files with no content... it just doesn't make sense.
// But we should produce an error for them, an empty CSS file will lead to a
// useless request for those running theme designer mode.
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 @ rule e.g. @media, @page, @keyframes
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)) {
// Keyframes declaration, we treat it exactly like a @media declaration except we don't allow
// them to be overridden to ensure we don't mess anything up. (means we keep everything in order)
$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($buffer)) {
// Check for known @ rules
if ($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 .= $char;
}
foreach ($medias as $media) {
$this->optimise($media);
}
$css = $this->produce_css($charset, $imports, $medias, $keyframes);
$this->timecomplete = microtime(true);
return trim($css);
}
/**
* Produces CSS for the given charset, imports, media, and keyframes
* @param string $charset
* @param array $imports
* @param array $medias
* @param array $keyframes
* @return string
*/
protected function produce_css($charset, array $imports, array $medias, array $keyframes) {
$css = '';
if (!empty($charset)) {
$imports[] = $charset;
}
if (!empty($imports)) {
$css .= implode("\n", $imports);
$css .= "\n\n";
}
$cssreset = array();
$cssstandard = array();
$csskeyframes = array();
// Process each media declaration individually
foreach ($medias as $media) {
// If this declaration applies to all media types
if (in_array('all', $media->get_types())) {
// Collect all rules that represet reset rules and remove them from the media object at the same time.
// We do this because we prioritise reset rules to the top of a CSS output. This ensures that they
// can't end up out of order because of optimisation.
$resetrules = $media->get_reset_rules(true);
if (!empty($resetrules)) {
$cssreset[] = css_writer::media('all', $resetrules);
}
}
// Get the standard cSS
$cssstandard[] = $media->out();
}
// Finally if there are any keyframe declarations process them now.
if (count($keyframes) > 0) {
foreach ($keyframes as $keyframe) {
$this->optimisedrules += $keyframe->count_rules();
$this->optimisedselectors += $keyframe->count_selectors();
if ($keyframe->has_errors()) {
$this->errors += $keyframe->get_errors();
}
$csskeyframes[] = $keyframe->out();
}
}
// Join it all together
$css .= join('', $cssreset);
$css .= join('', $cssstandard);
$css .= join('', $csskeyframes);
// Record the strlenght of the now optimised CSS.
$this->optimisedstrlen = strlen($css);
// Return the now produced CSS
return $css;
}
/**
* Optimises the CSS rules within a rule collection of one form or another
*
* @param css_rule_collection $media
* @return void This function acts in reference
*/
protected function optimise(css_rule_collection $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();
}
}
/**
* 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' => $this->optimisedselectors,
'improvementstrlen' => '-',
'improvementrules' => '-',
'improvementselectors' => '-',
);
// Avoid division by 0 errors by checking we have valid raw values
if ($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',
'firebrick' => '#B22222',
'floralwhite' => '#FFFAF0',
'forestgreen' => '#228B22',
'fuchsia' => '#FF00FF',
'gainsboro' => '#DCDCDC',
'ghostwhite' => '#F8F8FF',
'gold' => '#FFD700',
'goldenrod' => '#DAA520',
'gray' => '#808080',
'grey' => '#808080',
'green' => '#008000',
'greenyellow' => '#ADFF2F',
'honeydew' => '#F0FFF0',
'hotpink' => '#FF69B4',
'indianred ' => '#CD5C5C',
'indigo ' => '#4B0082',
'ivory' => '#FFFFF0',
'khaki' => '#F0E68C',
'lavender' => '#E6E6FA',
'lavenderblush' => '#FFF0F5',
'lawngreen' => '#7CFC00',
'lemonchiffon' => '#FFFACD',
'lightblue' => '#ADD8E6',
'lightcoral' => '#F08080',
'lightcyan' => '#E0FFFF',
'lightgoldenrodyellow' => '#FAFAD2',
'lightgray' => '#D3D3D3',
'lightgrey' => '#D3D3D3',
'lightgreen' => '#90EE90',
'lightpink' => '#FFB6C1',
'lightsalmon' => '#FFA07A',
'lightseagreen' => '#20B2AA',
'lightskyblue' => '#87CEFA',
'lightslategray' => '#778899',
'lightslategrey' => '#778899',
'lightsteelblue' => '#B0C4DE',
'lightyellow' => '#FFFFE0',
'lime' => '#00FF00',
'limegreen' => '#32CD32',
'linen' => '#FAF0E6',
'magenta' => '#FF00FF',
'maroon' => '#800000',
'mediumaquamarine' => '#66CDAA',
'mediumblue' => '#0000CD',
'mediumorchid' => '#BA55D3',
'mediumpurple' => '#9370D8',
'mediumseagreen' => '#3CB371',
'mediumslateblue' => '#7B68EE',
'mediumspringgreen' => '#00FA9A',
'mediumturquoise' => '#48D1CC',
'mediumvioletred' => '#C71585',
'midnightblue' => '#191970',
'mintcream' => '#F5FFFA',
'mistyrose' => '#FFE4E1',
'moccasin' => '#FFE4B5',
'navajowhite' => '#FFDEAD',
'navy' => '#000080',
'oldlace' => '#FDF5E6',
'olive' => '#808000',
'olivedrab' => '#6B8E23',
'orange' => '#FFA500',
'orangered' => '#FF4500',
'orchid' => '#DA70D6',
'palegoldenrod' => '#EEE8AA',
'palegreen' => '#98FB98',
'paleturquoise' => '#AFEEEE',
'palevioletred' => '#D87093',
'papayawhip' => '#FFEFD5',
'peachpuff' => '#FFDAB9',
'peru' => '#CD853F',
'pink' => '#FFC0CB',
'plum' => '#DDA0DD',
'powderblue' => '#B0E0E6',
'purple' => '#800080',
'red' => '#FF0000',
'rosybrown' => '#BC8F8F',
'royalblue' => '#4169E1',
'saddlebrown' => '#8B4513',
'salmon' => '#FA8072',
'sandybrown' => '#F4A460',
'seagreen' => '#2E8B57',
'seashell' => '#FFF5EE',
'sienna' => '#A0522D',
'silver' => '#C0C0C0',
'skyblue' => '#87CEEB',
'slateblue' => '#6A5ACD',
'slategray' => '#708090',
'slategrey' => '#708090',
'snow' => '#FFFAFA',
'springgreen' => '#00FF7F',
'steelblue' => '#4682B4',
'tan' => '#D2B48C',
'teal' => '#008080',
'thistle' => '#D8BFD8',
'tomato' => '#FF6347',
'transparent' => 'transparent',
'turquoise' => '#40E0D0',
'violet' => '#EE82EE',
'wheat' => '#F5DEB3',
'white' => '#FFFFFF',
'whitesmoke' => '#F5F5F5',
'yellow' => '#FFFF00',
'yellowgreen' => '#9ACD32'
);
}
/**
* Used to prepare CSS strings
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class css_writer {
/**
* The current indent level
* @var int
*/
protected static $indent = 0;
/**
* Returns true if the output should still maintain minimum formatting.
* @return bool
*/
protected static function is_pretty() {
global $CFG;
return (!empty($CFG->cssoptimiserpretty));
}
/**
* Returns the indenting char to use for indenting things nicely.
* @return string
*/
protected static function get_indent() {
if (self::is_pretty()) {
return str_repeat(" ", self::$indent);
}
return '';
}
/**
* Increases the current indent
*/
protected static function increase_indent() {
self::$indent++;
}
/**
* Decreases the current indent
*/
protected static function decrease_indent() {
self::$indent--;
}
/**
* Returns the string to use as a separator
* @return string
*/
protected static function get_separator() {
return (self::is_pretty())?"\n":' ';
}
/**
* Returns CSS for media
*
* @param string $typestring
* @param array $rules An array of css_rule objects
* @return string
*/
public static function media($typestring, array &$rules) {
$nl = self::get_separator();
$output = '';
if ($typestring !== 'all') {
$output .= "\n@media {$typestring} {".$nl;
self::increase_indent();
}
foreach ($rules as $rule) {
$output .= $rule->out().$nl;
}
if ($typestring !== 'all') {
self::decrease_indent();
$output .= '}';
}
return $output;
}
/**
* Returns CSS for a keyframe
*
* @param string $for The desired declaration. e.g. keyframes, -moz-keyframes, -webkit-keyframes
* @param string $name The name for the keyframe
* @param array $rules An array of rules belonging to the keyframe
* @return string
*/
public static function keyframe($for, $name, array &$rules) {
$nl = self::get_separator();
$output = "\n@{$for} {$name} {";
foreach ($rules as $rule) {
$output .= $rule->out();
}
$output .= '}';
return $output;
}
/**
* Returns CSS for a rule
*
* @param string $selector
* @param string $styles
* @return string
*/
public static function rule($selector, $styles) {
$css = self::get_indent()."{$selector}{{$styles}}";
return $css;
}
/**
* Returns CSS for the selectors of a rule
*
* @param array $selectors Array of css_selector objects
* @return string
*/
public static function selectors(array $selectors) {
$nl = self::get_separator();
$selectorstrings = array();
foreach ($selectors as $selector) {
$selectorstrings[] = $selector->out();
}
return join(','.$nl, $selectorstrings);
}
/**
* Returns a selector given the components that make it up.
*
* @param array $components
* @return string
*/
public static function selector(array $components) {
return trim(join(' ', $components));
}
/**
* Returns a CSS string for the provided styles
*
* @param array $styles Array of css_style objects
* @return string
*/
public static function styles(array $styles) {
$bits = array();
foreach ($styles as $style) {
// Check if the style is an array. If it is then we are outputing an advanced style.
// An advanced style is a style with one or more values, and can occur in situations like background-image
// where browse specific values are being used.
if (is_array($style)) {
foreach ($style as $advstyle) {
$bits[] = $advstyle->out();
}
continue;
}
$bits[] = $style->out();
}
return join('', $bits);
}
/**
* Returns a style CSS
*
* @param string $name
* @param string $value
* @param bool $important
* @return string
*/
public static function style($name, $value, $important = false) {
$value = trim($value);
if ($important && strpos($value, '!important') === false) {
$value .= ' !important';
}
return "{$name}:{$value};";
}
}
/**
* A structure to represent a CSS selector.
*
* The selector is the classes, id, elements, and psuedo bits that make up a CSS
* rule.
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_selector {
/**
* An array of selector bits
* @var array
*/
protected $selectors = array();
/**
* The number of selectors.
* @var int
*/
protected $count = 0;
/**
* Is null if there are no selectors, true if all selectors are basic and false otherwise.
* A basic selector is one that consists of just the element type. e.g. div, span, td, a
* @var bool|null
*/
protected $isbasic = null;
/**
* Initialises a new CSS selector
* @return css_selector
*/
public static function init() {
return new css_selector();
}
/**
* CSS selectors can only be created through the init method above.
*/
protected function __construct() {}
/**
* Adds a selector to the end of the current selector
* @param string $selector
*/
public function add($selector) {
$selector = trim($selector);
$count = 0;
$count += preg_match_all('/(\.|#)/', $selector, $matchesarray);
if (strpos($selector, '.') !== 0 && strpos($selector, '#') !== 0) {
$count ++;
}
// If its already false then no need to continue, its not basic
if ($this->isbasic !== false) {
// If theres more than one part making up this selector its not basic
if ($count > 1) {
$this->isbasic = false;
} else {
// Check whether it is a basic element (a-z+) with possible psuedo selector
$this->isbasic = (bool)preg_match('#^[a-z]+(:[a-zA-Z]+)?$#', $selector);
}
}
$this->count = $count;
$this->selectors[] = $selector;
}
/**
* Returns the number of individual components that make up this selector
* @return int
*/
public function get_selector_count() {
return $this->count;
}
/**
* Returns the selector for use in a CSS rule
* @return string
*/
public function out() {
return css_writer::selector($this->selectors);
}
/**
* Returns true is all of the selectors act only upon basic elements (no classes/ids)
* @return bool
*/
public function is_basic() {
return ($this->isbasic === true);
}
}
/**
* A structure to represent a CSS rule.
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_rule {
/**
* An array of CSS selectors {@link css_selector}
* @var array
*/
protected $selectors = array();
/**
* An array of CSS styles {@link css_style}
* @var array
*/
protected $styles = array();
/**
* Created a new CSS rule. This is the only way to create a new CSS rule externally.
* @return css_rule
*/
public static function init() {
return new css_rule();
}
/**
* Constructs a new css rule.
*
* @param string $selector The selector or array of selectors that make up this rule.
* @param array $styles An array of styles that belong to this rule.
*/
protected function __construct($selector = null, array $styles = array()) {
if ($selector != null) {
if (is_array($selector)) {
$this->selectors = $selector;
} else {
$this->selectors = array($selector);
}
$this->add_styles($styles);
}
}
/**
* Adds a new CSS selector to this rule
*
* e.g. $rule->add_selector('.one #two.two');
*
* @param css_selector $selector Adds a CSS selector to this rule.
*/
public function add_selector(css_selector $selector) {
$this->selectors[] = $selector;
}
/**
* Adds a new CSS style to this rule.
*
* @param css_style|string $style Adds a new style to this rule
*/
public function add_style($style) {
if (is_string($style)) {
$style = trim($style);
if (empty($style)) {
return;
}
$bits = explode(':', $style, 2);
if (count($bits) == 2) {
list($name, $value) = array_map('trim', $bits);
}
if (isset($name) && isset($value) && $name !== '' && $value !== '') {
$style = css_style::init_automatic($name, $value);
}
} else if ($style instanceof css_style) {
// Clone the style as it may be coming from another rule and we don't
// want references as it will likely be overwritten by proceeding
// rules
$style = clone($style);
}
if ($style instanceof css_style) {
$name = $style->get_name();
$exists = array_key_exists($name, $this->styles);
// We need to find out if the current style support multiple values, or whether the style
// is already set up to record multiple values. This can happen with background images which can have single
// and multiple values.
if ($style->allows_multiple_values() || ($exists && is_array($this->styles[$name]))) {
if (!$exists) {
$this->styles[$name] = array();
} else if ($this->styles[$name] instanceof css_style) {
$this->styles[$name] = array($this->styles[$name]);
}
$this->styles[$name][] = $style;
} else if ($exists) {
$this->styles[$name]->set_value($style->get_value());
} else {
$this->styles[$name] = $style;
}
} else if (is_array($style)) {
// We probably shouldn't worry about processing styles here but to
// be truthful it doesn't hurt.
foreach ($style as $astyle) {
$this->add_style($astyle);
}
}
}
/**
* An easy method of adding several styles at once. Just calls add_style.
*
* This method simply iterates over the array and calls {@link css_rule::add_style()}
* with each.
*
* @param array $styles Adds an array of styles
*/
public function add_styles(array $styles) {
foreach ($styles as $style) {
$this->add_style($style);
}
}
/**
* Returns the array of selectors
*
* @return array
*/
public function get_selectors() {
return $this->selectors;
}
/**
* Returns the array of styles
*
* @return array
*/
public function get_styles() {
return $this->styles;
}
/**
* Outputs this rule as a fragment of CSS
*
* @return string
*/
public function out() {
$selectors = css_writer::selectors($this->selectors);
$styles = css_writer::styles($this->get_consolidated_styles());
return css_writer::rule($selectors, $styles);
}
/**
* Consolidates all styles associated with this rule
*
* @return array An array of consolidated styles
*/
public function get_consolidated_styles() {
$organisedstyles = array();
$finalstyles = array();
$consolidate = array();
$advancedstyles = array();
foreach ($this->styles as $style) {
// If the style is an array then we are processing an advanced style. An advanced style is a style that can have
// one or more values. Background-image is one such example as it can have browser specific styles.
if (is_array($style)) {
$single = null;
$count = 0;
foreach ($style as $advstyle) {
$key = $count++;
$advancedstyles[$key] = $advstyle;
if (!$advstyle->allows_multiple_values()) {
if (!is_null($single)) {
unset($advancedstyles[$single]);
}
$single = $key;
}
}
if (!is_null($single)) {
$style = $advancedstyles[$single];
$consolidatetoclass = $style->consolidate_to();
if (($style->is_valid() || $style->is_special_empty_value()) && !empty($consolidatetoclass) && class_exists('css_style_'.$consolidatetoclass)) {
$class = 'css_style_'.$consolidatetoclass;
if (!array_key_exists($class, $consolidate)) {
$consolidate[$class] = array();
$organisedstyles[$class] = true;
}
$consolidate[$class][] = $style;
unset($advancedstyles[$single]);
}
}
continue;
}
$consolidatetoclass = $style->consolidate_to();
if (($style->is_valid() || $style->is_special_empty_value()) && !empty($consolidatetoclass) && class_exists('css_style_'.$consolidatetoclass)) {
$class = 'css_style_'.$consolidatetoclass;
if (!array_key_exists($class, $consolidate)) {
$consolidate[$class] = array();
$organisedstyles[$class] = true;
}
$consolidate[$class][] = $style;
} else {
$organisedstyles[$style->get_name()] = $style;
}
}
foreach ($consolidate as $class => $styles) {
$organisedstyles[$class] = $class::consolidate($styles);
}
foreach ($organisedstyles as $style) {
if (is_array($style)) {
foreach ($style as $s) {
$finalstyles[] = $s;
}
} else {
$finalstyles[] = $style;
}
}
$finalstyles = array_merge($finalstyles, $advancedstyles);
return $finalstyles;
}
/**
* Splits this rules into an array of CSS rules. One for each of the selectors
* that make up this rule.
*
* @return array(css_rule)
*/
public function split_by_selector() {
$return = array();
foreach ($this->selectors as $selector) {
$return[] = new css_rule($selector, $this->styles);
}
return $return;
}
/**
* Splits this rule into an array of rules. One for each of the styles that
* make up this rule
*
* @return array Array of css_rule objects
*/
public function split_by_style() {
$return = array();
foreach ($this->styles as $style) {
if (is_array($style)) {
$return[] = new css_rule($this->selectors, $style);
continue;
}
$return[] = new css_rule($this->selectors, array($style));
}
return $return;
}
/**
* Gets a hash for the styles of this rule
*
* @return string
*/
public function get_style_hash() {
return md5(css_writer::styles($this->styles));
}
/**
* Gets a hash for the selectors of this rule
*
* @return string
*/
public function get_selector_hash() {
return md5(css_writer::selectors($this->selectors));
}
/**
* Gets the number of selectors that make up this rule.
*
* @return int
*/
public function get_selector_count() {
$count = 0;
foreach ($this->selectors as $selector) {
$count += $selector->get_selector_count();
}
return $count;
}
/**
* Returns true if there are any errors with this rule.
*
* @return bool
*/
public function has_errors() {
foreach ($this->styles as $style) {
if (is_array($style)) {
foreach ($style as $advstyle) {
if ($advstyle->has_error()) {
return true;
}
}
continue;
}
if ($style->has_error()) {
return true;
}
}
return false;
}
/**
* Returns the error strings that were recorded when processing this rule.
*
* Before calling this function you should first call {@link css_rule::has_errors()}
* to make sure there are errors (hopefully there arn't).
*
* @return string
*/
public function get_error_string() {
$css = $this->out();
$errors = array();
foreach ($this->styles as $style) {
if ($style->has_error()) {
$errors[] = " * ".$style->get_last_error();
}
}
return $css." has the following errors:\n".join("\n", $errors);
}
/**
* Returns true if this rule could be considered a reset rule.
*
* A reset rule is a rule that acts upon an HTML element and does not include any other parts to its selector.
*
* @return bool
*/
public function is_reset_rule() {
foreach ($this->selectors as $selector) {
if (!$selector->is_basic()) {
return false;
}
}
return true;
}
}
/**
* An abstract CSS rule collection class.
*
* This class is extended by things such as media and keyframe declaration. They are declarations that
* group rules together for a purpose.
* When no declaration is specified rules accumulate into @media all.
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class css_rule_collection {
/**
* An array of rules within this collection instance
* @var array
*/
protected $rules = array();
/**
* The collection must be able to print itself.
*/
abstract public function out();
/**
* Adds a new CSS rule to this collection instance
*
* @param css_rule $newrule
*/
public function add_rule(css_rule $newrule) {
foreach ($newrule->split_by_selector() as $rule) {
$hash = $rule->get_selector_hash();
if (!array_key_exists($hash, $this->rules)) {
$this->rules[$hash] = $rule;
} else {
$this->rules[$hash]->add_styles($rule->get_styles());
}
}
}
/**
* Returns the rules used by this collection
*
* @return array
*/
public function get_rules() {
return $this->rules;
}
/**
* Organises rules by gropuing selectors based upon the styles and consolidating
* those selectors into single rules.
*
* @return bool True if the CSS was optimised by this method
*/
public function organise_rules_by_selectors() {
$optimised = array();
$beforecount = count($this->rules);
$lasthash = null;
$lastrule = null;
foreach ($this->rules as $rule) {
$hash = $rule->get_style_hash();
if ($lastrule !== null && $lasthash !== null && $hash === $lasthash) {
foreach ($rule->get_selectors() as $selector) {
$lastrule->add_selector($selector);
}
continue;
}
$lastrule = clone($rule);
$lasthash = $hash;
$optimised[] = $lastrule;
}
$this->rules = array();
foreach ($optimised as $optimised) {
$this->rules[$optimised->get_selector_hash()] = $optimised;
}
$aftercount = count($this->rules);
return ($beforecount < $aftercount);
}
/**
* Returns the total number of rules that exist within this collection
*
* @return int
*/
public function count_rules() {
return count($this->rules);
}
/**
* Returns the total number of selectors that exist within this collection
*
* @return int
*/
public function count_selectors() {
$count = 0;
foreach ($this->rules as $rule) {
$count += $rule->get_selector_count();
}
return $count;
}
/**
* Returns true if the collection has any rules that have errors
*
* @return boolean
*/
public function has_errors() {
foreach ($this->rules as $rule) {
if ($rule->has_errors()) {
return true;
}
}
return false;
}
/**
* Returns any errors that have happened within rules in this collection.
*
* @return string
*/
public function get_errors() {
$errors = array();
foreach ($this->rules as $rule) {
if ($rule->has_errors()) {
$errors[] = $rule->get_error_string();
}
}
return $errors;
}
}
/**
* A media class to organise rules by the media they apply to.
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_media extends css_rule_collection {
/**
* An array of the different media types this instance applies to.
* @var array
*/
protected $types = array();
/**
* Initalises a new media instance
*
* @param string $for The media that the contained rules are destined for.
*/
public function __construct($for = 'all') {
$types = explode(',', $for);
$this->types = array_map('trim', $types);
}
/**
* Returns the CSS for this media and all of its rules.
*
* @return string
*/
public function out() {
return css_writer::media(join(',', $this->types), $this->rules);
}
/**
* Returns an array of media that this media instance applies to
*
* @return array
*/
public function get_types() {
return $this->types;
}
/**
* Returns all of the reset rules known by this media set.
* @param bool $remove If set to true reset rules will be removed before being returned.
* @return array
*/
public function get_reset_rules($remove = false) {
$resetrules = array();
foreach ($this->rules as $key => $rule) {
if ($rule->is_reset_rule()) {
$resetrules[] = clone $rule;
if ($remove) {
unset($this->rules[$key]);
}
}
}
return $resetrules;
}
}
/**
* A media class to organise rules by the media they apply to.
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_keyframe extends css_rule_collection {
/** @var string $for The directive e.g. keyframes, -moz-keyframes, -webkit-keyframes */
protected $for;
/** @var string $name The name for the keyframes */
protected $name;
/**
* Constructs a new keyframe
*
* @param string $for The directive e.g. keyframes, -moz-keyframes, -webkit-keyframes
* @param string $name The name for the keyframes
*/
public function __construct($for, $name) {
$this->for = $for;
$this->name = $name;
}
/**
* Returns the directive of this keyframe
*
* e.g. keyframes, -moz-keyframes, -webkit-keyframes
* @return string
*/
public function get_for() {
return $this->for;
}
/**
* Returns the name of this keyframe
* @return string
*/
public function get_name() {
return $this->name;
}
/**
* Returns the CSS for this collection of keyframes and all of its rules.
*
* @return string
*/
public function out() {
return css_writer::keyframe($this->for, $this->name, $this->rules);
}
}
/**
* An absract class to represent CSS styles
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class css_style {
/** Constant used for recongise a special empty value in a CSS style */
const NULL_VALUE = '@@$NULL$@@';
/**
* The name of the style
* @var string
*/
protected $name;
/**
* The value for the style
* @var mixed
*/
protected $value;
/**
* If set to true this style was defined with the !important rule.
* Only trolls use !important.
* Don't hide under bridges.. its not good for your skin. Do the proper thing
* and fix the issue don't just force a fix that will undoubtedly one day
* lead to further frustration.
* @var bool
*/
protected $important = false;
/**
* Gets set to true if this style has an error
* @var bool
*/
protected $error = false;
/**
* The last error message that occured
* @var string
*/
protected $errormessage = null;
/**
* Initialises a new style.
*
* This is the only public way to create a style to ensure they that appropriate
* style class is used if it exists.
*
* @param string $name The name of the style.
* @param string $value The value of the style.
* @return css_style_generic
*/
public static function init_automatic($name, $value) {
$specificclass = 'css_style_'.preg_replace('#[^a-zA-Z0-9]+#', '', $name);
if (class_exists($specificclass)) {
return $specificclass::init($value);
}
return new css_style_generic($name, $value);
}
/**
* Creates a new style when given its name and value
*
* @param string $name The name of the style.
* @param string $value The value of the style.
*/
protected function __construct($name, $value) {
$this->name = $name;
$this->set_value($value);
}
/**
* Sets the value for the style
*
* @param string $value
*/
final public function set_value($value) {
$value = trim($value);
$important = preg_match('#(\!important\s*;?\s*)$#', $value, $matches);
if ($important) {
$value = substr($value, 0, -(strlen($matches[1])));
$value = rtrim($value);
}
if (!$this->important || $important) {
$this->value = $this->clean_value($value);
$this->important = $important;
}
if (!$this->is_valid()) {
$this->set_error('Invalid value for '.$this->name);
}
}
/**
* Returns true if the value associated with this style is valid
*
* @return bool
*/
public function is_valid() {
return true;
}
/**
* Returns the name for the style
*
* @return string
*/
public function get_name() {
return $this->name;
}
/**
* Returns the value for the style
*
* @param bool $includeimportant If set to true and the rule is important !important postfix will be used.
* @return string
*/
public function get_value($includeimportant = true) {
$value = $this->value;
if ($includeimportant && $this->important) {
$value .= ' !important';
}
return $value;
}
/**
* Returns the style ready for use in CSS
*
* @param string|null $value A value to use to override the value for this style.
* @return string
*/
public function out($value = null) {
if (is_null($value)) {
$value = $this->get_value();
}
return css_writer::style($this->name, $value, $this->important);
}
/**
* This can be overridden by a specific style allowing it to clean its values
* consistently.
*
* @param mixed $value
* @return mixed
*/
protected function clean_value($value) {
return $value;
}
/**
* If this particular style can be consolidated into another style this function
* should return the style that it can be consolidated into.
*
* @return string|null
*/
public function consolidate_to() {
return null;
}
/**
* Sets the last error message.
*
* @param string $message
*/
protected function set_error($message) {
$this->error = true;
$this->errormessage = $message;
}
/**
* Returns true if an error has occured
*
* @return bool
*/
public function has_error() {
return $this->error;
}
/**
* Returns the last error that occured or null if no errors have happened.
*
* @return string
*/
public function get_last_error() {
return $this->errormessage;
}
/**
* Returns true if the value for this style is the special null value.
*
* This should only be overriden in circumstances where a shorthand style can lead
* to move explicit styles being overwritten. Not a common place occurenace.
*
* Example:
* This occurs if the shorthand background property was used but no proper value
* was specified for this style.
* This leads to a null value being used unless otherwise overridden.
*
* @return bool
*/
public function is_special_empty_value() {
return false;
}
/**
* Returns true if this style permits multiple values.
*
* This occurs for styles such as background image that can have browser specific values that need to be maintained because
* of course we don't know what browser the user is using, and optimisation occurs before caching.
* Thus we must always server all values we encounter in the order we encounter them for when this is set to true.
*
* @return boolean False by default, true if the style supports muliple values.
*/
public function allows_multiple_values() {
return false;
}
/**
* Returns true if this style was marked important.
* @return bool
*/
public function is_important() {
return !empty($this->important);
}
/**
* Sets the important flag for this style and its current value.
* @param bool $important
*/
public function set_important($important = true) {
$this->important = (bool) $important;
}
}
/**
* A generic CSS style class to use when a more specific class does not exist.
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_generic extends css_style {
/**
* Cleans incoming values for typical things that can be optimised.
*
* @param mixed $value Cleans the provided value optimising it if possible
* @return string
*/
protected function clean_value($value) {
if (trim($value) == '0px') {
$value = 0;
} else if (preg_match('/^#([a-fA-F0-9]{3,6})/', $value, $matches)) {
$value = '#'.strtoupper($matches[1]);
}
return $value;
}
}
/**
* A colour CSS style
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_color extends css_style {
/**
* Creates a new colour style
*
* @param mixed $value Initialises a new colour style
* @return css_style_color
*/
public static function init($value) {
return new css_style_color('color', $value);
}
/**
* Cleans the colour unifing it to a 6 char hash colour if possible
* Doing this allows us to associate identical colours being specified in
* different ways. e.g. Red, red, #F00, and #F00000
*
* @param mixed $value Cleans the provided value optimising it if possible
* @return string
*/
protected function clean_value($value) {
$value = trim($value);
if (css_is_colour($value)) {
if (preg_match('/#([a-fA-F0-9]{6})/', $value, $matches)) {
$value = '#'.strtoupper($matches[1]);
} else if (preg_match('/#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/', $value, $matches)) {
$value = $matches[1] . $matches[1] . $matches[2] . $matches[2] . $matches[3] . $matches[3];
$value = '#'.strtoupper($value);
} else if (array_key_exists(strtolower($value), css_optimiser::$htmlcolours)) {
$value = css_optimiser::$htmlcolours[strtolower($value)];
}
}
return $value;
}
/**
* Returns the colour style for use within CSS.
* Will return an optimised hash colour.
*
* e.g #123456
* #123 instead of #112233
* #F00 instead of red
*
* @param string $overridevalue If provided then this value will be used instead
* of the styles current value.
* @return string
*/
public function out($overridevalue = null) {
if ($overridevalue === null) {
$overridevalue = $this->value;
}
return parent::out(self::shrink_value($overridevalue));
}
/**
* Shrinks the colour value is possible.
*
* @param string $value Shrinks the current value to an optimial form if possible
* @return string
*/
public static function shrink_value($value) {
if (preg_match('/#([a-fA-F0-9])\1([a-fA-F0-9])\2([a-fA-F0-9])\3/', $value, $matches)) {
return '#'.$matches[1].$matches[2].$matches[3];
}
return $value;
}
/**
* Returns true if the value is a valid colour.
*
* @return bool
*/
public function is_valid() {
return css_is_colour($this->value);
}
}
/**
* A width style
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_width extends css_style {
/**
* Checks if the width is valid
* @return bool
*/
public function is_valid() {
return css_is_width($this->value);
}
/**
* Cleans the provided value
*
* @param mixed $value Cleans the provided value optimising it if possible
* @return string
*/
protected function clean_value($value) {
if (!css_is_width($value)) {
// Note we don't actually change the value to something valid. That
// would be bad for futureproofing.
$this->set_error('Invalid width specified for '.$this->name);
} else if (preg_match('#^0\D+$#', $value)) {
$value = 0;
}
return trim($value);
}
/**
* Initialises a new width style
*
* @param mixed $value The value this style has
* @return css_style_width
*/
public static function init($value) {
return new css_style_width('width', $value);
}
}
/**
* A margin style
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_margin extends css_style_width {
/**
* Initialises a margin style.
*
* In this case we split the margin into several other margin styles so that
* we can properly condense overrides and then reconsolidate them later into
* an optimal form.
*
* @param string $value The value the style has
* @return array An array of margin values that can later be consolidated
*/
public static function init($value) {
$important = '';
if (strpos($value, '!important') !== false) {
$important = ' !important';
$value = str_replace('!important', '', $value);
}
$value = preg_replace('#\s+#', ' ', trim($value));
$bits = explode(' ', $value, 4);
$top = $right = $bottom = $left = null;
if (count($bits) > 0) {
$top = $right = $bottom = $left = array_shift($bits);
}
if (count($bits) > 0) {
$right = $left = array_shift($bits);
}
if (count($bits) > 0) {
$bottom = array_shift($bits);
}
if (count($bits) > 0) {
$left = array_shift($bits);
}
return array(
new css_style_margintop('margin-top', $top.$important),
new css_style_marginright('margin-right', $right.$important),
new css_style_marginbottom('margin-bottom', $bottom.$important),
new css_style_marginleft('margin-left', $left.$important)
);
}
/**
* Consolidates individual margin styles into a single margin style
*
* @param array $styles
* @return array An array of consolidated styles
*/
public static function consolidate(array $styles) {
if (count($styles) != 4) {
return $styles;
}
$someimportant = false;
$allimportant = null;
$notimportantequal = null;
$firstvalue = null;
foreach ($styles as $style) {
if ($style->is_important()) {
$someimportant = true;
if ($allimportant === null) {
$allimportant = true;
}
} else {
if ($allimportant === true) {
$allimportant = false;
}
if ($firstvalue == null) {
$firstvalue = $style->get_value(false);
$notimportantequal = true;
} else if ($notimportantequal && $firstvalue !== $style->get_value(false)) {
$notimportantequal = false;
}
}
}
if ($someimportant && !$allimportant && !$notimportantequal) {
return $styles;
}
if ($someimportant && !$allimportant && $notimportantequal) {
$return = array(
new css_style_margin('margin', $firstvalue)
);
foreach ($styles as $style) {
if ($style->is_important()) {
$return[] = $style;
}
}
return $return;
} else {
$top = null;
$right = null;
$bottom = null;
$left = null;
foreach ($styles as $style) {
switch ($style->get_name()) {
case 'margin-top' :
$top = $style->get_value(false);
break;
case 'margin-right' :
$right = $style->get_value(false);
break;
case 'margin-bottom' :
$bottom = $style->get_value(false);
break;
case 'margin-left' :
$left = $style->get_value(false);
break;
}
}
if ($top == $bottom && $left == $right) {
if ($top == $left) {
$returnstyle = new css_style_margin('margin', $top);
} else {
$returnstyle = new css_style_margin('margin', "{$top} {$left}");
}
} else if ($left == $right) {
$returnstyle = new css_style_margin('margin', "{$top} {$right} {$bottom}");
} else {
$returnstyle = new css_style_margin('margin', "{$top} {$right} {$bottom} {$left}");
}
if ($allimportant) {
$returnstyle->set_important();
}
return array($returnstyle);
}
}
}
/**
* A margin top style
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_margintop extends css_style_margin {
/**
* A simple init, just a single style
*
* @param string $value The value the style has
* @return css_style_margintop
*/
public static function init($value) {
return new css_style_margintop('margin-top', $value);
}
/**
* This style can be consolidated into a single margin style
*
* @return string
*/
public function consolidate_to() {
return 'margin';
}
}
/**
* A margin right style
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_marginright extends css_style_margin {
/**
* A simple init, just a single style
*
* @param string $value The value the style has
* @return css_style_margintop
*/
public static function init($value) {
return new css_style_marginright('margin-right', $value);
}
/**
* This style can be consolidated into a single margin style
*
* @return string
*/
public function consolidate_to() {
return 'margin';
}
}
/**
* A margin bottom style
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_marginbottom extends css_style_margin {
/**
* A simple init, just a single style
*
* @param string $value The value the style has
* @return css_style_margintop
*/
public static function init($value) {
return new css_style_marginbottom('margin-bottom', $value);
}
/**
* This style can be consolidated into a single margin style
*
* @return string
*/
public function consolidate_to() {
return 'margin';
}
}
/**
* A margin left style
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_marginleft extends css_style_margin {
/**
* A simple init, just a single style
*
* @param string $value The value the style has
* @return css_style_margintop
*/
public static function init($value) {
return new css_style_marginleft('margin-left', $value);
}
/**
* This style can be consolidated into a single margin style
*
* @return string
*/
public function consolidate_to() {
return 'margin';
}
}
/**
* A border style
*
* @package core
* @category css
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class css_style_border extends css_style {
/**
* Initalises the border style into an array of individual style compontents
*
* @param string $value The value the style has
* @return css_style_bordercolor
*/
public static function init($value) {
$value = preg_replace('#\s+#', ' ', $value);
$bits = explode(' ', $value, 3);
$return = array();
if (count($bits) > 0) {
$width = array_shift($bits);
if (!css_style_borderwidth::is_border_width($width)) {
$width = '0';
}
$return[] = new css_style_borderwidth('border-top-width', $width);
$return[] = new css_style_borderwidth('border-right-width', $width);
$return[] = new css_style_borderwidth('border-bottom-width', $width);
$return[] = new css_style_borderwidth('border-left-width', $width);
}
if (count($bits) > 0) {
$style = array_shift($bits);
$return[] = new css_style_borderstyle('border-top-style', $style);
$return[] = new css_style_borderstyle('border-right-style', $style);
$return[] = new css_style_borderstyle('border-bottom-style', $style);
$return[] = new css_style_borderstyle('border-left-style', $style);
}
if (count($bits) > 0) {
$colour = array_shift($bits);
$return[] = new css_style_bordercolor('border-top-color', $colour);
$return[] = new css_style_bordercolor('border-right-color', $colour);
$return[] = new css_style_bordercolor('border-bottom-color', $colour);
$return[] = new css_style_bordercolor('border-left-color', $colour);
}
return $return;
}
/**
* Consolidates all border styles into a single style
*
* @param array $styles An array of border styles
* @return array An optimised array of border styles
*/
public static function consolidate(array $styles) {
$borderwidths = array('top' => null, 'right' => null, 'bottom' => null, 'left' => null);
$borderstyles = array('top' => null, 'right' => null, 'bottom' => null, 'left' => null);
$bordercolors = array('top' => null, 'right' => null, 'bottom' => null, 'left' => null);
foreach ($styles as $style) {
switch ($style->get_name()) {
case 'border-top-width':
$borderwidths['top'] = $style->get_value();
break;
case 'border-right-width':
$borderwidths['right'] = $style->get_value();
break;
case 'border-bottom-width':
$borderwidths['bottom'] = $style->get_value();
break;
case 'border-left-width':
$borderwidths['left'] = $style->get_value();
break;
case 'border-top-style':
$borderstyles['top'] = $style->get_value();
break;
case 'border-right-style':
$borderstyles['right'] = $style->get_value();
break;
case 'border-bottom-style':
$borderstyles['bottom'] = $style->get_value();
break;
case 'border-left-style':
$borderstyles['left'] = $style->get_value();
break;
case 'border-top-color':
$bordercolors['top'] = css_style_color::shrink_value($style->get_value());
break;
case 'border-right-color':
$bordercolors['right'] = css_style_color::shrink_value($style->get_value());
break;
case 'border-bottom-color':
$bordercolors['bottom'] = css_style_color::shrink_value($style->get_value());
break;
case 'border-left-color':
$bordercolors['left'] = css_style_color::shrink_value($style->get_value());
break;
}
}
$uniquewidths = count(array_unique($borderwidths));
$uniquestyles = count(array_unique($borderstyles));
$uniquecolors = count(array_unique($bordercolors));
$nullwidths = in_array(null, $borderwidths, true);
$nullstyles = in_array(null, $borderstyles, true);
$nullcolors = in_array(null, $bordercolors, true);
$allwidthsthesame = ($uniquewidths === 1)?1:0;
$allstylesthesame = ($uniquestyles === 1)?1:0;
$allcolorsthesame = ($uniquecolors === 1)?1:0;
$allwidthsnull = $allwidthsthesame && $nullwidths;
$allstylesnull = $allstylesthesame && $nullstyles;
$allcolorsnull = $allcolorsthesame && $nullcolors;
$return = array();
if ($allwidthsnull && $allstylesnull && $allcolorsnull) {
// Everything is null still... boo
return array(new css_style_border('border', ''));
} else if ($allwidthsnull && $allstylesnull) {
self::consolidate_styles_by_direction($return, 'css_style_bordercolor', 'border-color', $bordercolors);
return $return;
} else if ($allwidthsnull && $allcolorsnull) {
self::consolidate_styles_by_direction($return, 'css_style_borderstyle', 'border-style', $borderstyles);
return $return;
} else if ($allcolorsnull && $allstylesnull) {
self::consolidate_styles_by_direction($return, 'css_style_borderwidth', 'border-width', $borderwidths);
return $return;
}
if ($allwidthsthesame + $allstylesthesame + $allcolorsthesame == 3) {
$return[] = new css_style_border('border', $borderwidths['top'].' '.$borderstyles['top'].' '.$bordercolors['top']);
} else if ($allwidthsthesame + $allstylesthesame + $allcolorsthesame == 2) {
if ($allwidthsthesame && $allstylesthesame && !$nullwidths && !$nullstyles) {
$return[] = new css_style_border('border', $borderwidths['top'].' '.$borderstyles['top']);
self::consolidate_styles_by_direction($return, 'css_style_bordercolor', 'border-color', $bordercolors);
} else if ($allwidthsthesame && $allcolorsthesame && !$nullwidths && !$nullcolors) {
$return[] = new css_style_border('border', $borderwidths['top'].' solid '.$bordercolors['top']);
self::consolidate_styles_by_direction($return, 'css_style_borderstyle', 'border-style', $borderstyles);
} else if ($allstylesthesame && $allcolorsthesame && !$nullstyles && !$nullcolors) {
$return[] = new css_style_border('border', '1px '.$borderstyles['top'].' '.$bordercolors['top']);
self::consolidate_styles_by_direction($return, 'css_style_borderwidth', 'border-width', $borderwidths);
} else {
self::consolidate_styles_by_direction($return, 'css_style_borderwidth', 'border-width', $borderwidths);
self::consolidate_styles_by_direction($return, 'css_style_borderstyle', 'border-style', $borderstyles);
self::consolidate_styles_by_direction($return, 'css_style_bordercolor', 'border-color', $bordercolors);
}
} else if (!$nullwidths && !$nullcolors && !$nullstyles && max(array_count_values($borderwidths)) == 3 && max(array_count_values($borderstyles)) == 3 && max(array_count_values($bordercolors)) == 3) {
$widthkeys = array();
$stylekeys = array();
$colorkeys = array();
foreach ($borderwidths as $key => $value) {
if (!array_key_exists($value, $widthkeys)) {
$widthkeys[$value] = array();
}
$widthkeys[$value][] = $key;
}
usort($widthkeys, 'css_sort_by_count');
$widthkeys = array_values($widthkeys);
foreach ($borderstyles as $key => $value) {
if (!array_key_exists($value, $stylekeys)) {
$stylekeys[$value] = array();
}
$stylekeys[$value][] = $key;
}
usort($stylekeys, 'css_sort_by_count');
$stylekeys = array_values($stylekeys);
foreach ($bordercolors as $key => $value) {
if (!array_key_exists($value, $colorkeys)) {
$colorkeys[$value] = array();
}
$colorkeys[$value][] = $key;
}
usort($colorkeys, 'css_sort_by_count');
$colorkeys = array_values($colorkeys);
if ($widthkeys == $stylekeys && $stylekeys == $colorkeys) {
$key = $widthkeys[0][0];
self::build_style_string($return, 'css_style_border', 'border', $borderwidths[$key], $borderstyles[$key], $bordercolors[$key]);
$key = $widthkeys[1][0];
self::build_style_string($return, 'css_style_border'.$key, 'border-'.$key, $borderwidths[$key], $borderstyles[$key], $bordercolors[$key]);
} else {
self::build_style_string($return, 'css_style_bordertop', 'border-top', $borderwidths['top'], $borderstyles['top'], $bordercolors['top']);
self::build_style_string($return, 'css_style_borderright', 'border-right', $borderwidths['right'], $borderstyles['right'], $bordercolors['right']);
self::build_style_string($return, 'css_style_borderbottom', 'border-bottom', $borderwidths['bottom'], $borderstyles['bottom'], $bordercolors['bottom']);
self::build_style_string($return, 'css_style_borderleft', 'border-left', $borderwidths['left'], $borderstyles['left'], $bordercolors['left']);
}
} else {
self::build_style_string($return, 'css_style_bordertop', 'border-top', $borderwidths['top'], $borderstyles['top'], $bordercolors['top']);
self::build_style_string($return, 'css_style_borderright', 'border-right', $borderwidths['right'], $borderstyles['right'], $bordercolors['right']);
self::build_style_string($return, 'css_style_borderbottom', 'border-bottom', $borderwidths['bottom'], $borderstyles['bottom'], $bordercolors['bottom']);
self::build_style_string($return, 'css_style_borderleft', 'border-left', $borderwidths['left'], $borderstyles['left'], $bordercolors['left']);
}
foreach ($return as $key => $style) {
if ($style->get_value() == '') {
unset($return[$key]);
}
}
return $return;
}
/**
* Border styles get consolidated to a single border style.
*
* @return string
*/
public function consolidate_to() {
return 'border';
}
/**
* Consolidates a series of border styles into an optimised array of border
* styles by looking at the direction of the border and prioritising that
* during the optimisation.
*
* @param array $array An array to add styles into during consolidation. Passed by reference.
* @param string $class The class type to initalise
* @param string $style The style to create
* @param string|array $top The top value
* @param string $right The right value
* @param string $bottom The bottom value
* @param string $left The left value
* @return bool
*/
public static function consolidate_styles_by_direction(&$array, $class, $style, $top, $right = null, $bottom = null, $left = null) {
if (is_array($top)) {
$right = $top['right'];
$bottom = $top['bottom'];
$left = $top['left'];
$top = $top['top'];
}
if ($top == $bottom && $left == $right && $top == $left) {
if (is_null($top)) {
$array[] = new $class($style, '');
} else {
$array[] = new $class($style, $top);
}
} else if ($top == null || $right == null || $bottom == null || $left == null) {
if ($top !== null) {
$array[] = new $class(str_replace('border-', 'border-top-', $style), $top);
}
if ($right !== null) {
$array[] = new $class(str_replace('border-', 'border-right-', $style), $right);
}
if ($bottom !== null) {
$array[] = new $class(str_replace('border-', 'border-bottom-', $style), $bottom);
}
if ($left !== null) {
$array[] = new $class(str_replace('border-', 'border-left-', $style), $left);
}
} else if ($top == $bottom && $left == $right) {
$array[] = new $class($style, $top.' '.$right);
} else if ($left == $right) {
$array[] = new $class($style, $top.' '.$right.' '.$bottom);
} else {
$array[] = new $class($style, $top.' '.$right.' '.$bottom.' '.$left);
}
return true;
}
/**
* Builds a border style for a set of width, style, and colour values
*
* @param array $array An array into which the generated style is added
* @param string $class The class type to initialise
* @param string $cssstyle The style to use
* @param string $width The width of the border
* @param string $style The style of the border
* @param string $color The colour of the border
* @return bool
*/
public static function build_style_string(&$array, $class, $cssstyle, $width = null, $style = null, $color = null) {
if (!is_null($width) && !is_null($style) && !is_null($color)) {
$array[] = new $class($cssstyle, $width.' '.$style.' '.$color);
} else if (!is_null($width) && !is_null($style) && is_null($color)) {