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<?php
/**
* Renders a diff for a single slot.
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup DifferenceEngine
*/
use Wikimedia\Assert\Assert;
/**
* Renders a diff for a single slot (that is, a diff between two content objects).
*
* Callers should obtain instances of this class by invoking ContentHandler::getSlotDiffRenderer
* on the content handler of the new content object (ie. the one shown on the right side
* of the diff), or of the old one if the new one does not exist.
*
* The default implementation just does a text diff on the native text representation.
* Content handler extensions can subclass this to provide a more appropriate diff method by
* overriding ContentHandler::getSlotDiffRendererInternal. Other extensions that want to interfere
* with diff generation in some way can use the GetSlotDiffRenderer hook.
*
* @stable to extend
* @ingroup DifferenceEngine
*/
abstract class SlotDiffRenderer {
/**
* Get a diff between two content objects. One of them might be null (meaning a slot was
* created or removed), but both cannot be. $newContent (or if it's null then $oldContent)
* must have the same content model that was used to obtain this diff renderer.
* @param Content|null $oldContent
* @param Content|null $newContent
* @return string HTML, one or more <tr> tags.
*/
abstract public function getDiff( Content $oldContent = null, Content $newContent = null );
/**
* Add modules needed for correct styling/behavior of the diff.
* @stable to override
* @param OutputPage $output
*/
public function addModules( OutputPage $output ) {
}
/**
* Return any extra keys to split the diff cache by.
* @stable to override
* @return array
*/
public function getExtraCacheKeys() {
return [];
}
/**
* Helper method to normalize the input of getDiff().
* Verifies that at least one of $oldContent and $newContent is not null, verifies that
* they are instances of one of the allowed classes (if provided), and replaces null with
* empty content.
* @param Content|null &$oldContent
* @param Content|null &$newContent
* @param string|array|null $allowedClasses
*/
protected function normalizeContents(
Content &$oldContent = null, Content &$newContent = null, $allowedClasses = null
) {
if ( !$oldContent && !$newContent ) {
throw new InvalidArgumentException( '$oldContent and $newContent cannot both be null' );
}
if ( $allowedClasses ) {
if ( is_array( $allowedClasses ) ) {
$allowedClasses = implode( '|', $allowedClasses );
}
Assert::parameterType( $allowedClasses . '|null', $oldContent, '$oldContent' );
Assert::parameterType( $allowedClasses . '|null', $newContent, '$newContent' );
}
if ( !$oldContent ) {
$oldContent = $newContent->getContentHandler()->makeEmptyContent();
} elseif ( !$newContent ) {
$newContent = $oldContent->getContentHandler()->makeEmptyContent();
}
}
}
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