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<?php
/**
* A content object represents page content, e.g. the text to show on a page.
* Content objects have no knowledge about how they relate to Wiki pages.
*
* 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
*
* @since 1.21
*
* @file
* @ingroup Content
*
* @author Daniel Kinzler
*/
/**
* Base implementation for content objects.
*
* @ingroup Content
*/
abstract class AbstractContent implements Content {
/**
* Name of the content model this Content object represents.
* Use with CONTENT_MODEL_XXX constants
*
* @since 1.21
*
* @var string $model_id
*/
protected $model_id;
/**
* @param string $modelId
*
* @since 1.21
*/
public function __construct( $modelId = null ) {
$this->model_id = $modelId;
}
/**
* @since 1.21
*
* @see Content::getModel
*/
public function getModel() {
return $this->model_id;
}
/**
* @since 1.21
*
* @param string $modelId The model to check
*
* @throws MWException If the provided ID is not the ID of the content model supported by this
* Content object.
*/
protected function checkModelID( $modelId ) {
if ( $modelId !== $this->model_id ) {
throw new MWException(
"Bad content model: " .
"expected {$this->model_id} " .
"but got $modelId."
);
}
}
/**
* @since 1.21
*
* @see Content::getContentHandler
*/
public function getContentHandler() {
return ContentHandler::getForContent( $this );
}
/**
* @since 1.21
*
* @see Content::getDefaultFormat
*/
public function getDefaultFormat() {
return $this->getContentHandler()->getDefaultFormat();
}
/**
* @since 1.21
*
* @see Content::getSupportedFormats
*/
public function getSupportedFormats() {
return $this->getContentHandler()->getSupportedFormats();
}
/**
* @since 1.21
*
* @param string $format
*
* @return bool
*
* @see Content::isSupportedFormat
*/
public function isSupportedFormat( $format ) {
if ( !$format ) {
return true; // this means "use the default"
}
return $this->getContentHandler()->isSupportedFormat( $format );
}
/**
* @since 1.21
*
* @param string $format The serialization format to check.
*
* @throws MWException If the format is not supported by this content handler.
*/
protected function checkFormat( $format ) {
if ( !$this->isSupportedFormat( $format ) ) {
throw new MWException(
"Format $format is not supported for content model " .
$this->getModel()
);
}
}
/**
* @since 1.21
*
* @param string $format
*
* @return string
*
* @see Content::serialize
*/
public function serialize( $format = null ) {
return $this->getContentHandler()->serializeContent( $this, $format );
}
/**
* @since 1.21
*
* @return bool
*
* @see Content::isEmpty
*/
public function isEmpty() {
return $this->getSize() === 0;
}
/**
* Subclasses may override this to implement (light weight) validation.
*
* @since 1.21
*
* @return bool Always true.
*
* @see Content::isValid
*/
public function isValid() {
return true;
}
/**
* @since 1.21
*
* @param Content $that
*
* @return bool
*
* @see Content::equals
*/
public function equals( Content $that = null ) {
if ( is_null( $that ) ) {
return false;
}
if ( $that === $this ) {
return true;
}
if ( $that->getModel() !== $this->getModel() ) {
return false;
}
return $this->getNativeData() === $that->getNativeData();
}
/**
* Returns a list of DataUpdate objects for recording information about this
* Content in some secondary data store.
*
* This default implementation returns a LinksUpdate object and calls the
* SecondaryDataUpdates hook.
*
* Subclasses may override this to determine the secondary data updates more
* efficiently, preferably without the need to generate a parser output object.
* They should however make sure to call SecondaryDataUpdates to give extensions
* a chance to inject additional updates.
*
* @since 1.21
*
* @param Title $title
* @param Content $old
* @param bool $recursive
* @param ParserOutput $parserOutput
*
* @return DataUpdate[]
*
* @see Content::getSecondaryDataUpdates()
*/
public function getSecondaryDataUpdates( Title $title, Content $old = null,
$recursive = true, ParserOutput $parserOutput = null
) {
if ( $parserOutput === null ) {
$parserOutput = $this->getParserOutput( $title, null, null, false );
}
$updates = [
new LinksUpdate( $title, $parserOutput, $recursive )
];
Hooks::run( 'SecondaryDataUpdates', [ $title, $old, $recursive, $parserOutput, &$updates ] );
return $updates;
}
/**
* @since 1.21
*
* @return Title[]|null
*
* @see Content::getRedirectChain
*/
public function getRedirectChain() {
global $wgMaxRedirects;
$title = $this->getRedirectTarget();
if ( is_null( $title ) ) {
return null;
}
// recursive check to follow double redirects
$recurse = $wgMaxRedirects;
$titles = [ $title ];
while ( --$recurse > 0 ) {
if ( $title->isRedirect() ) {
$page = WikiPage::factory( $title );
$newtitle = $page->getRedirectTarget();
} else {
break;
}
// Redirects to some special pages are not permitted
if ( $newtitle instanceof Title && $newtitle->isValidRedirectTarget() ) {
// The new title passes the checks, so make that our current
// title so that further recursion can be checked
$title = $newtitle;
$titles[] = $newtitle;
} else {
break;
}
}
return $titles;
}
/**
* Subclasses that implement redirects should override this.
*
* @since 1.21
*
* @return null
*
* @see Content::getRedirectTarget
*/
public function getRedirectTarget() {
return null;
}
/**
* @note Migrated here from Title::newFromRedirectRecurse.
*
* @since 1.21
*
* @return Title|null
*
* @see Content::getUltimateRedirectTarget
*/
public function getUltimateRedirectTarget() {
$titles = $this->getRedirectChain();
return $titles ? array_pop( $titles ) : null;
}
/**
* @since 1.21
*
* @return bool
*
* @see Content::isRedirect
*/
public function isRedirect() {
return $this->getRedirectTarget() !== null;
}
/**
* This default implementation always returns $this.
* Subclasses that implement redirects should override this.
*
* @since 1.21
*
* @param Title $target
*
* @return Content $this
*
* @see Content::updateRedirect
*/
public function updateRedirect( Title $target ) {
return $this;
}
/**
* @since 1.21
*
* @return null
*
* @see Content::getSection
*/
public function getSection( $sectionId ) {
return null;
}
/**
* @since 1.21
*
* @return null
*
* @see Content::replaceSection
*/
public function replaceSection( $sectionId, Content $with, $sectionTitle = '' ) {
return null;
}
/**
* @since 1.21
*
* @return Content $this
*
* @see Content::preSaveTransform
*/
public function preSaveTransform( Title $title, User $user, ParserOptions $popts ) {
return $this;
}
/**
* @since 1.21
*
* @return Content $this
*
* @see Content::addSectionHeader
*/
public function addSectionHeader( $header ) {
return $this;
}
/**
* @since 1.21
*
* @return Content $this
*
* @see Content::preloadTransform
*/
public function preloadTransform( Title $title, ParserOptions $popts, $params = [] ) {
return $this;
}
/**
* @since 1.21
*
* @return Status
*
* @see Content::prepareSave
*/
public function prepareSave( WikiPage $page, $flags, $parentRevId, User $user ) {
if ( $this->isValid() ) {
return Status::newGood();
} else {
return Status::newFatal( "invalid-content-data" );
}
}
/**
* @since 1.21
*
* @param WikiPage $page
* @param ParserOutput $parserOutput
*
* @return LinksDeletionUpdate[]
*
* @see Content::getDeletionUpdates
*/
public function getDeletionUpdates( WikiPage $page, ParserOutput $parserOutput = null ) {
return [
new LinksDeletionUpdate( $page ),
];
}
/**
* This default implementation always returns false. Subclasses may override
* this to supply matching logic.
*
* @since 1.21
*
* @param MagicWord $word
*
* @return bool Always false.
*
* @see Content::matchMagicWord
*/
public function matchMagicWord( MagicWord $word ) {
return false;
}
/**
* This base implementation calls the hook ConvertContent to enable custom conversions.
* Subclasses may override this to implement conversion for "their" content model.
*
* @param string $toModel
* @param string $lossy
*
* @return Content|bool
*
* @see Content::convert()
*/
public function convert( $toModel, $lossy = '' ) {
if ( $this->getModel() === $toModel ) {
// nothing to do, shorten out.
return $this;
}
$lossy = ( $lossy === 'lossy' ); // string flag, convert to boolean for convenience
$result = false;
Hooks::run( 'ConvertContent', [ $this, $toModel, $lossy, &$result ] );
return $result;
}
/**
* Returns a ParserOutput object containing information derived from this content.
* Most importantly, unless $generateHtml was false, the return value contains an
* HTML representation of the content.
*
* Subclasses that want to control the parser output may override this, but it is
* preferred to override fillParserOutput() instead.
*
* Subclasses that override getParserOutput() itself should take care to call the
* ContentGetParserOutput hook.
*
* @since 1.24
*
* @param Title $title Context title for parsing
* @param int|null $revId Revision ID (for {{REVISIONID}})
* @param ParserOptions|null $options Parser options
* @param bool $generateHtml Whether or not to generate HTML
*
* @return ParserOutput Containing information derived from this content.
*/
public function getParserOutput( Title $title, $revId = null,
ParserOptions $options = null, $generateHtml = true
) {
if ( $options === null ) {
$options = $this->getContentHandler()->makeParserOptions( 'canonical' );
}
$po = new ParserOutput();
if ( Hooks::run( 'ContentGetParserOutput',
[ $this, $title, $revId, $options, $generateHtml, &$po ] ) ) {
// Save and restore the old value, just in case something is reusing
// the ParserOptions object in some weird way.
$oldRedir = $options->getRedirectTarget();
$options->setRedirectTarget( $this->getRedirectTarget() );
$this->fillParserOutput( $title, $revId, $options, $generateHtml, $po );
$options->setRedirectTarget( $oldRedir );
}
Hooks::run( 'ContentAlterParserOutput', [ $this, $title, $po ] );
return $po;
}
/**
* Fills the provided ParserOutput with information derived from the content.
* Unless $generateHtml was false, this includes an HTML representation of the content.
*
* This is called by getParserOutput() after consulting the ContentGetParserOutput hook.
* Subclasses are expected to override this method (or getParserOutput(), if need be).
* Subclasses of TextContent should generally override getHtml() instead.
*
* This placeholder implementation always throws an exception.
*
* @since 1.24
*
* @param Title $title Context title for parsing
* @param int|null $revId Revision ID (for {{REVISIONID}})
* @param ParserOptions $options Parser options
* @param bool $generateHtml Whether or not to generate HTML
* @param ParserOutput &$output The output object to fill (reference).
*
* @throws MWException
*/
protected function fillParserOutput( Title $title, $revId,
ParserOptions $options, $generateHtml, ParserOutput &$output
) {
// Don't make abstract, so subclasses that override getParserOutput() directly don't fail.
throw new MWException( 'Subclasses of AbstractContent must override fillParserOutput!' );
}
}