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<?php
/**
* A parser extension that adds two tags, <ref> and <references> for adding
* citations to pages
*
* @ingroup Extensions
*
* Documentation
* @link https://www.mediawiki.org/wiki/Extension:Cite/Cite.php
*
* <cite> definition in HTML
* @link http://www.w3.org/TR/html4/struct/text.html#edef-CITE
*
* <cite> definition in XHTML 2.0
* @link http://www.w3.org/TR/2005/WD-xhtml2-20050527/mod-text.html#edef_text_cite
*
* @bug https://phabricator.wikimedia.org/T6579
*
* @author Ævar Arnfjörð Bjarmason <avarab@gmail.com>
* @copyright Copyright © 2005, Ævar Arnfjörð Bjarmason
* @license GPL-2.0-or-later
*/
namespace Cite;
use LogicException;
use MediaWiki\Config\Config;
use MediaWiki\Html\Html;
use MediaWiki\MediaWikiServices;
use MediaWiki\Parser\Parser;
use MediaWiki\Parser\Sanitizer;
use MediaWiki\Registration\ExtensionRegistry;
use StatusValue;
/**
* @license GPL-2.0-or-later
*/
class Cite {
public const DEFAULT_GROUP = '';
/**
* Message key for the (localized) tracking category for pages using the `details` attribute.
*/
public const DETAILS_TRACKING_CATEGORY = 'cite-tracking-category-ref-details';
private bool $isSectionPreview;
private FootnoteMarkFormatter $footnoteMarkFormatter;
private ReferenceListFormatter $referenceListFormatter;
private ErrorReporter $errorReporter;
/**
* True when a <ref> tag is being processed.
* Used to avoid infinite recursion
*/
private bool $inRefTag = false;
/**
* @var null|string The current group name while parsing nested <ref> in <references>. Null when
* parsing <ref> outside of <references>. Warning, an empty string is a valid group name!
*/
private ?string $inReferencesGroup = null;
/**
* Error stack used when defining refs in <references>
*/
private StatusValue $mReferencesErrors;
private ReferenceStack $referenceStack;
private Config $config;
public function __construct( Parser $parser, Config $config ) {
$this->isSectionPreview = $parser->getOptions()->getIsSectionPreview();
$messageLocalizer = new ReferenceMessageLocalizer( $parser->getContentLanguage() );
$this->errorReporter = new ErrorReporter( $messageLocalizer );
$this->mReferencesErrors = StatusValue::newGood();
$this->referenceStack = new ReferenceStack();
$anchorFormatter = new AnchorFormatter();
$markSymbolRenderer = new MarkSymbolRenderer(
$messageLocalizer
);
$services = MediaWikiServices::getInstance();
// FIXME: Use the existing 'Cite.BacklinkMarkRenderer' service here?
$backlinkMarkRenderer = new BacklinkMarkRenderer(
$parser->getContentLanguage()->getCode(),
$messageLocalizer,
$services->getService( 'Cite.AlphabetsProvider' ),
ExtensionRegistry::getInstance()->isLoaded( 'CommunityConfiguration' ) ?
$services->getService( 'CommunityConfiguration.ProviderFactory' ) : null,
$config
);
$this->footnoteMarkFormatter = new FootnoteMarkFormatter(
$anchorFormatter,
$markSymbolRenderer,
$messageLocalizer
);
$this->referenceListFormatter = new ReferenceListFormatter(
$this->errorReporter,
$anchorFormatter,
$backlinkMarkRenderer,
$messageLocalizer
);
$this->config = $config;
}
/**
* Callback function for <ref>
*
* @param Parser $parser
* @param ?string $text Raw, untrimmed wikitext content of the <ref> tag, if any
* @param array<string,?string> $argv Arguments as given in <ref name=…>, already trimmed
*
* @return string|null Null in case a <ref> tag is not allowed in the current context
*/
public function ref( Parser $parser, ?string $text, array $argv ): ?string {
if ( $this->inRefTag ) {
return null;
}
$this->inRefTag = true;
$ret = $this->guardedRef( $parser, $text, $argv );
$this->inRefTag = false;
return $ret;
}
/**
* @param Parser $parser
* @param ?string $text Raw, untrimmed wikitext content of the <ref> tag, if any
* @param array<string,?string> $argv Arguments as given in <ref name=…>, already trimmed
*
* @return string HTML
*/
private function guardedRef(
Parser $parser,
?string $text,
array $argv
): string {
$status = Validator::filterRefArguments( $argv, $this->config->get( 'CiteSubReferencing' ) );
$arguments = $status->getValue();
// When it's null it means the attribute is allowed, but not used
if ( isset( $arguments['details'] ) ) {
$parser->addTrackingCategory( self::DETAILS_TRACKING_CATEGORY );
}
// FIXME: Duplication required for isKnown, but the Validator is supposed to do this.
$group = $arguments['group'] ?? $this->inReferencesGroup;
$validator = new Validator(
$this->inReferencesGroup,
$this->referenceStack->isKnown( $group, $arguments['name'] ),
$this->isSectionPreview
);
$status->merge( $validator->validateRef( $text, $arguments ), true );
if ( $status->isOK() ) {
$arguments = $status->getValue();
}
// Validation cares about the difference between null and empty, but from here on we don't
if ( $text !== null && trim( $text ) === '' ) {
$text = null;
}
if ( $this->inReferencesGroup !== null ) {
// Fatal errors intentionally make the list-defined <ref> not render at all
if ( !$status->isOK() ) {
// We know we are in the middle of a <references> tag and can't display errors in place
// FIXME: All fatals should be shown, but this is a product change for later
$firstError = $status->getMessages()[0];
$this->mReferencesErrors->fatal( $firstError->getKey(), ...$firstError->getParams() );
} else {
// Validation made sure we always have group and name while in <references>
$ref = $this->referenceStack->listDefinedRef( $arguments['group'], $arguments['name'], $text );
// Remember all non-fatal warnings to be displayed as part of the reference list
foreach ( $status->getMessages() as $msg ) {
$ref->warnings[] = [ $msg->getKey(), ...$msg->getParams() ];
}
}
return '';
}
if ( !$status->isOK() ) {
$this->referenceStack->pushInvalidRef();
// FIXME: If we ever have multiple errors, these must all be presented to the user,
// so they know what to correct.
// TODO: Make this nicer, see T238061
return $this->errorReporter->firstError( $parser, $status );
}
// @phan-suppress-next-line PhanParamTooFewUnpack No good way to document it.
$ref = $this->referenceStack->pushRef(
$parser->getStripState(), $text, $argv, ...array_values( $arguments ) );
if ( !$ref ) {
// Rare edge-cases like follow="…" don't render a footnote marker in-place
return '';
}
// Remember all non-fatal warnings to be displayed as part of the reference list
foreach ( $status->getMessages() as $msg ) {
$ref->warnings[] = [ $msg->getKey(), ...$msg->getParams() ];
}
$wikitext = $this->footnoteMarkFormatter->linkRef( $ref );
return $parser->recursiveTagParse( $wikitext );
}
/**
* Callback function for <references>
*
* @param Parser $parser
* @param ?string $text Raw, untrimmed wikitext content of the <references> tag, if any
* @param array<string,?string> $argv Arguments as given in <references …>, already trimmed
*
* @return string|null Null in case a <references> tag is not allowed in the current context
*/
public function references( Parser $parser, ?string $text, array $argv ): ?string {
if ( $this->inRefTag || $this->inReferencesGroup !== null ) {
return null;
}
$status = Validator::filterReferenceListArguments( $argv );
$arguments = $status->getValue();
$this->inReferencesGroup = $arguments['group'] ?? self::DEFAULT_GROUP;
$status->merge( $this->parseReferencesTagContent( $parser, $text ) );
if ( !$status->isGood() ) {
$ret = $this->errorReporter->firstError( $parser, $status );
} else {
$responsive = $arguments['responsive'];
$ret = $this->formatReferences( $parser, $this->inReferencesGroup, $responsive );
// Append errors collected while {@see parseReferencesTagContent} processed <ref> tags
// in <references>
$ret .= $this->formatReferencesErrors( $parser );
}
$this->inReferencesGroup = null;
return $ret;
}
/**
* @param Parser $parser
* @param ?string $text Raw, untrimmed wikitext content of the <references> tag, if any
*
* @return StatusValue
*/
private function parseReferencesTagContent( Parser $parser, ?string $text ): StatusValue {
// Nothing to parse in an empty <references /> tag
if ( $text === null || trim( $text ) === '' ) {
return StatusValue::newGood();
}
if ( preg_match( '{' . preg_quote( Parser::MARKER_PREFIX ) . '-(ext-)?(?i:references)-}', $text ) ) {
return StatusValue::newFatal( 'cite_error_included_references' );
}
// Detect whether we were sent already rendered <ref>s. Mostly a side effect of using
// {{#tag:references}}. The following assumes that the parsed <ref>s sent within the
// <references> block were the most recent calls to <ref>. This assumption is true for
// all known use cases, but not strictly enforced by the parser. It is possible that
// some unusual combination of #tag, <references> and conditional parser functions could
// be created that would lead to malformed references here.
preg_match_all( '{' . preg_quote( Parser::MARKER_PREFIX ) . '-(ext-)?(?i:ref)-}', $text, $matches );
$count = count( $matches[0] );
// Undo effects of calling <ref> while unaware of being contained in <references>
foreach ( $this->referenceStack->rollbackRefs( $count ) as $call ) {
// Rerun <ref> call with the <references> context now being known
$this->guardedRef( $parser, ...$call );
}
// Parse the <references> content to process any unparsed <ref> tags, but drop the resulting
// HTML
$parser->recursiveTagParse( $text );
return StatusValue::newGood();
}
private function formatReferencesErrors( Parser $parser ): string {
$html = '';
foreach ( $this->mReferencesErrors->getMessages() as $msg ) {
if ( $html ) {
$html .= "<br />\n";
}
$html .= $this->errorReporter->halfParsed( $parser, $msg->getKey(), ...$msg->getParams() );
}
$this->mReferencesErrors = StatusValue::newGood();
return $html ? "\n$html" : '';
}
/**
* @param Parser $parser
* @param string $group
* @param string|null $responsive Defaults to $wgCiteResponsiveReferences when not set
*
* @return string HTML
*/
private function formatReferences(
Parser $parser,
string $group,
?string $responsive = null
): string {
$responsiveReferences = $this->config->get( 'CiteResponsiveReferences' );
return $this->referenceListFormatter->formatReferences(
$parser,
$this->referenceStack->popGroup( $group ),
$responsive !== null ? $responsive !== '0' : $responsiveReferences,
$this->isSectionPreview
);
}
/**
* Called at the end of page processing to append a default references
* section, if refs were used without a main references tag. If there are references
* in a custom group, and there is no references tag for it, show an error
* message for that group.
* If we are processing a section preview, this adds the missing
* references tags and does not add the errors.
*
* @param Parser $parser
* @param bool $isSectionPreview
*
* @return string HTML
*/
public function checkRefsNoReferences( Parser $parser, bool $isSectionPreview ): string {
$s = '';
foreach ( $this->referenceStack->getGroups() as $group ) {
if ( $group === self::DEFAULT_GROUP || $isSectionPreview ) {
$s .= $this->formatReferences( $parser, $group );
} else {
$s .= '<br />' . $this->errorReporter->halfParsed(
$parser,
'cite_error_group_refs_without_references',
Sanitizer::safeEncodeAttribute( $group )
);
}
}
if ( $isSectionPreview && $s !== '' ) {
$headerMsg = wfMessage( 'cite_section_preview_references' );
if ( !$headerMsg->isDisabled() ) {
$s = Html::element(
'h2',
[ 'id' => 'mw-ext-cite-cite_section_preview_references_header' ],
$headerMsg->text()
) . $s;
}
// provide a preview of references in its own section
$s = Html::rawElement(
'div',
[ 'class' => 'mw-ext-cite-cite_section_preview_references' ],
$s
);
}
return $s !== '' ? "\n" . $s : '';
}
/**
* @see https://phabricator.wikimedia.org/T240248
* @return never
*/
public function __clone() {
throw new LogicException( 'Create a new instance please' );
}
}