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MDL-55381 output: Themes can post process CSS using a CSS tree object

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Part of MDL-55071
This commit is contained in:
Frederic Massart 2016-08-02 11:10:24 +08:00 committed by Dan Poltawski
parent 515ceadddd
commit 99a6118f28
1 changed files with 17 additions and 3 deletions
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20
lib/outputlib.php
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@ -284,6 +284,17 @@ class theme_config {
*/
public $csspostprocess = null;
/**
* @var string Function to do custom CSS post-processing on a parsed CSS tree.
*
* This is an advanced feature. If you want to do custom post-processing on the
* CSS before it is output, you can provide the name of the function here. The
* function will receive a CSS tree document as first parameter, and the theme_config
* object as second parameter. A return value is not required, the tree can
* be edited in place.
*/
public $csstreepostprocess = null;
/**
* @var string Accessibility: Right arrow-like character is
* used in the breadcrumb trail, course navigation menu
@ -525,7 +536,7 @@ class theme_config {
'rendererfactory', 'csspostprocess', 'editor_sheets', 'rarrow', 'larrow', 'uarrow', 'darrow',
'hidefromselector', 'doctype', 'yuicssmodules', 'blockrtlmanipulations',
'lessfile', 'extralesscallback', 'lessvariablescallback', 'blockrendermethod',
'scssfile', 'extrascsscallback', 'scssvariablescallback');
'scssfile', 'extrascsscallback', 'scssvariablescallback', 'csstreepostprocessor');
foreach ($config as $key=>$value) {
if (in_array($key, $configurable)) {
@ -1539,7 +1550,8 @@ class theme_config {
}
// Post processing using an object representation of CSS.
$needsparsing = !empty($this->rtlmode);
$hastreeprocessor = !empty($this->csstreepostprocessor) && function_exists($this->csstreepostprocessor);
$needsparsing = $hastreeprocessor || !empty($this->rtlmode);
if ($needsparsing) {
$parser = new core_cssparser($css);
$csstree = $parser->parse();
@ -1550,7 +1562,9 @@ class theme_config {
$this->rtlize($csstree);
}
if ($needsparsing) {
if ($hastreeprocessor) {
$fn = $this->csstreepostprocessor;
$fn($csstree, $this);
$css = $csstree->render();
unset($csstree);
}