wikimedia/mediawiki-core

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includes/parser/CoreParserFunctions.php

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<?php
/**
 * Parser functions provided by MediaWiki core
 *
 * 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 Parser
 */

use MediaWiki\MediaWikiServices;
use MediaWiki\Revision\RevisionAccessException;
use MediaWiki\Revision\RevisionRecord;

/**
 * Various core parser functions, registered in Parser::firstCallInit()
 * @ingroup Parser
 */
class CoreParserFunctions {
    /**
     * @param Parser $parser
     * @return void
     */
    public static function register( $parser ) {
        global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;

        # Syntax for arguments (see Parser::setFunctionHook):
        #  "name for lookup in localized magic words array",
        #  function callback,
        #  optional Parser::SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}}
        #    instead of {{#int:...}})
        $noHashFunctions = [
            'ns', 'nse', 'urlencode', 'lcfirst', 'ucfirst', 'lc', 'uc',
            'localurl', 'localurle', 'fullurl', 'fullurle', 'canonicalurl',
            'canonicalurle', 'formatnum', 'grammar', 'gender', 'plural', 'bidi',
            'numberofpages', 'numberofusers', 'numberofactiveusers',
            'numberofarticles', 'numberoffiles', 'numberofadmins',
            'numberingroup', 'numberofedits', 'language',
            'padleft', 'padright', 'anchorencode', 'defaultsort', 'filepath',
            'pagesincategory', 'pagesize', 'protectionlevel', 'protectionexpiry',
            'namespacee', 'namespacenumber', 'talkspace', 'talkspacee',
            'subjectspace', 'subjectspacee', 'pagename', 'pagenamee',
            'fullpagename', 'fullpagenamee', 'rootpagename', 'rootpagenamee',
            'basepagename', 'basepagenamee', 'subpagename', 'subpagenamee',
            'talkpagename', 'talkpagenamee', 'subjectpagename',
            'subjectpagenamee', 'pageid', 'revisionid', 'revisionday',
            'revisionday2', 'revisionmonth', 'revisionmonth1', 'revisionyear',
            'revisiontimestamp', 'revisionuser', 'cascadingsources',
        ];
        foreach ( $noHashFunctions as $func ) {
            $parser->setFunctionHook( $func, [ __CLASS__, $func ], Parser::SFH_NO_HASH );
        }

        $parser->setFunctionHook(
            'namespace',
            [ __CLASS__, 'mwnamespace' ],
            Parser::SFH_NO_HASH
        );
        $parser->setFunctionHook( 'int', [ __CLASS__, 'intFunction' ], Parser::SFH_NO_HASH );
        $parser->setFunctionHook( 'special', [ __CLASS__, 'special' ] );
        $parser->setFunctionHook( 'speciale', [ __CLASS__, 'speciale' ] );
        $parser->setFunctionHook( 'tag', [ __CLASS__, 'tagObj' ], Parser::SFH_OBJECT_ARGS );
        $parser->setFunctionHook( 'formatdate', [ __CLASS__, 'formatDate' ] );

        if ( $wgAllowDisplayTitle ) {
            $parser->setFunctionHook(
                'displaytitle',
                [ __CLASS__, 'displaytitle' ],
                Parser::SFH_NO_HASH
            );
        }
        if ( $wgAllowSlowParserFunctions ) {
            $parser->setFunctionHook(
                'pagesinnamespace',
                [ __CLASS__, 'pagesinnamespace' ],
                Parser::SFH_NO_HASH
            );
        }
    }

    /**
     * @param Parser $parser
     * @param string $part1 Message key
     * @param mixed ...$params To pass to wfMessage()
     * @return array
     */
    public static function intFunction( $parser, $part1 = '', ...$params ) {
        if ( strval( $part1 ) !== '' ) {
            $message = wfMessage( $part1, $params )
                ->inLanguage( $parser->getOptions()->getUserLangObj() );
            return [ $message->plain(), 'noparse' => false ];
        } else {
            return [ 'found' => false ];
        }
    }

    /**
     * @param Parser $parser
     * @param string $date
     * @param string|null $defaultPref
     *
     * @return string
     */
    public static function formatDate( $parser, $date, $defaultPref = null ) {
        $lang = $parser->getFunctionLang();
        $df = MediaWikiServices::getInstance()->getDateFormatterFactory()->get( $lang );

        $date = trim( $date );

        $pref = $parser->getOptions()->getDateFormat();

        // Specify a different default date format other than the normal default
        // if the user has 'default' for their setting
        if ( $pref == 'default' && $defaultPref ) {
            $pref = $defaultPref;
        }

        $date = $df->reformat( $pref, $date, [ 'match-whole' ] );
        return $date;
    }

    public static function ns( $parser, $part1 = '' ) {
        if ( intval( $part1 ) || $part1 == "0" ) {
            $index = intval( $part1 );
        } else {
            $index = $parser->getContentLanguage()->getNsIndex( str_replace( ' ', '_', $part1 ) );
        }
        if ( $index !== false ) {
            return $parser->getContentLanguage()->getFormattedNsText( $index );
        } else {
            return [ 'found' => false ];
        }
    }

    public static function nse( $parser, $part1 = '' ) {
        $ret = self::ns( $parser, $part1 );
        if ( is_string( $ret ) ) {
            $ret = wfUrlencode( str_replace( ' ', '_', $ret ) );
        }
        return $ret;
    }

    /**
     * urlencodes a string according to one of three patterns: (T24474)
     *
     * By default (for HTTP "query" strings), spaces are encoded as '+'.
     * Or to encode a value for the HTTP "path", spaces are encoded as '%20'.
     * For links to "wiki"s, or similar software, spaces are encoded as '_',
     *
     * @param Parser $parser
     * @param string $s The text to encode.
     * @param string|null $arg (optional): The type of encoding.
     * @return string
     */
    public static function urlencode( $parser, $s = '', $arg = null ) {
        static $magicWords = null;
        if ( $magicWords === null ) {
            $magicWords =
                $parser->getMagicWordFactory()->newArray( [ 'url_path', 'url_query', 'url_wiki' ] );
        }
        switch ( $magicWords->matchStartToEnd( $arg ) ) {
            // Encode as though it's a wiki page, '_' for ' '.
            case 'url_wiki':
                $func = 'wfUrlencode';
                $s = str_replace( ' ', '_', $s );
                break;

            // Encode for an HTTP Path, '%20' for ' '.
            case 'url_path':
                $func = 'rawurlencode';
                break;

            // Encode for HTTP query, '+' for ' '.
            case 'url_query':
            default:
                $func = 'urlencode';
        }
        // See T105242, where the choice to kill markers and various
        // other options were discussed.
        return $func( $parser->killMarkers( $s ) );
    }

    public static function lcfirst( $parser, $s = '' ) {
        return $parser->getContentLanguage()->lcfirst( $s );
    }

    public static function ucfirst( $parser, $s = '' ) {
        return $parser->getContentLanguage()->ucfirst( $s );
    }

    /**
     * @param Parser $parser
     * @param string $s
     * @return string
     */
    public static function lc( $parser, $s = '' ) {
        return $parser->markerSkipCallback( $s, [ $parser->getContentLanguage(), 'lc' ] );
    }

    /**
     * @param Parser $parser
     * @param string $s
     * @return string
     */
    public static function uc( $parser, $s = '' ) {
        return $parser->markerSkipCallback( $s, [ $parser->getContentLanguage(), 'uc' ] );
    }

    public static function localurl( $parser, $s = '', $arg = null ) {
        return self::urlFunction( 'getLocalURL', $s, $arg );
    }

    public static function localurle( $parser, $s = '', $arg = null ) {
        $temp = self::urlFunction( 'getLocalURL', $s, $arg );
        if ( !is_string( $temp ) ) {
            return $temp;
        } else {
            return htmlspecialchars( $temp );
        }
    }

    public static function fullurl( $parser, $s = '', $arg = null ) {
        return self::urlFunction( 'getFullURL', $s, $arg );
    }

    public static function fullurle( $parser, $s = '', $arg = null ) {
        $temp = self::urlFunction( 'getFullURL', $s, $arg );
        if ( !is_string( $temp ) ) {
            return $temp;
        } else {
            return htmlspecialchars( $temp );
        }
    }

    public static function canonicalurl( $parser, $s = '', $arg = null ) {
        return self::urlFunction( 'getCanonicalURL', $s, $arg );
    }

    public static function canonicalurle( $parser, $s = '', $arg = null ) {
        $temp = self::urlFunction( 'getCanonicalURL', $s, $arg );
        if ( !is_string( $temp ) ) {
            return $temp;
        } else {
            return htmlspecialchars( $temp );
        }
    }

    public static function urlFunction( $func, $s = '', $arg = null ) {
        $title = Title::newFromText( $s );
        # Due to order of execution of a lot of bits, the values might be encoded
        # before arriving here; if that's true, then the title can't be created
        # and the variable will fail. If we can't get a decent title from the first
        # attempt, url-decode and try for a second.
        if ( $title === null ) {
            $title = Title::newFromURL( urldecode( $s ) );
        }
        if ( $title !== null ) {
            # Convert NS_MEDIA -> NS_FILE
            if ( $title->inNamespace( NS_MEDIA ) ) {
                $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
            }
            if ( $arg !== null ) {
                $text = $title->$func( $arg );
            } else {
                $text = $title->$func();
            }
            return $text;
        } else {
            return [ 'found' => false ];
        }
    }

    /**
     * @param Parser $parser
     * @param string $num
     * @param string|null $arg
     * @return string
     */
    public static function formatnum( $parser, $num = '', $arg = null ) {
        if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg ) ) {
            $func = [ $parser->getFunctionLang(), 'parseFormattedNumber' ];
        } elseif (
            self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'nocommafysuffix', $arg )
        ) {
            $func = [ $parser->getFunctionLang(), 'formatNumNoSeparators' ];
        } else {
            $func = self::getLegacyFormatNum( $parser );
        }
        return $parser->markerSkipCallback( $num, $func );
    }

    private static function getLegacyFormatNum( $parser ) {
        // For historic reasons, the formatNum parser function will
        // take arguments which are not actually formatted numbers,
        // which then trigger deprecation warnings in commafy.  Instead
        // emit a tracking category instead to allow linting.
        $validNumberRe = '(-(?=[\d\.]))?(\d+|(?=\.\d))(\.\d*)?';
        return function ( $number ) use ( $parser, $validNumberRe ) {
            if ( !preg_match( "/^{$validNumberRe}$/", $number ) ) {
                $parser->addTrackingCategory( 'nonnumeric-formatnum' );
            }
            return preg_replace_callback( "/{$validNumberRe}/", function ( $m ) use ( $parser ) {
                return $parser->getFunctionLang()->formatNum( $m[0] );
            }, $number );
        };
    }

    /**
     * @param Parser $parser
     * @param string $case
     * @param string $word
     * @return string
     */
    public static function grammar( $parser, $case = '', $word = '' ) {
        $word = $parser->killMarkers( $word );
        return $parser->getFunctionLang()->convertGrammar( $word, $case );
    }

    /**
     * @param Parser $parser
     * @param string $username
     * @param string ...$forms What to output for each gender
     * @return string
     */
    public static function gender( $parser, $username, ...$forms ) {
        // Some shortcuts to avoid loading user data unnecessarily
        if ( count( $forms ) === 0 ) {
            return '';
        } elseif ( count( $forms ) === 1 ) {
            return $forms[0];
        }

        $username = trim( $username );

        $gender = User::getDefaultOption( 'gender' );

        // allow prefix and normalize (e.g. "&#42;foo" -> "*foo" ).
        $title = Title::newFromText( $username, NS_USER );

        if ( $title && $title->inNamespace( NS_USER ) ) {
            $username = $title->getText();
        }

        // check parameter, or use the ParserOptions if in interface message
        $user = User::newFromName( $username );
        $genderCache = MediaWikiServices::getInstance()->getGenderCache();
        if ( $user ) {
            $gender = $genderCache->getGenderOf( $user, __METHOD__ );
        } elseif ( $username === '' && $parser->getOptions()->getInterfaceMessage() ) {
            $gender = $genderCache->getGenderOf( $parser->getOptions()->getUser(), __METHOD__ );
        }
        $ret = $parser->getFunctionLang()->gender( $gender, $forms );
        return $ret;
    }

    /**
     * @param Parser $parser
     * @param string $text
     * @param string ...$forms What to output for each number (singular, dual, plural, etc.)
     * @return string
     */
    public static function plural( $parser, $text = '', ...$forms ) {
        $text = $parser->getFunctionLang()->parseFormattedNumber( $text );
        settype( $text, ctype_digit( $text ) ? 'int' : 'float' );
        return $parser->getFunctionLang()->convertPlural( $text, $forms );
    }

    /**
     * @param Parser $parser
     * @param string $text
     * @return string
     */
    public static function bidi( $parser, $text = '' ) {
        return $parser->getFunctionLang()->embedBidi( $text );
    }

    /**
     * Shorthand for getting a Language Converter for Target language
     * @param Parser $parser Parent parser
     * @return ILanguageConverter
     */
    private static function getTargetLanguageConverter( Parser $parser ) : ILanguageConverter {
        return MediaWikiServices::getInstance()->getLanguageConverterFactory()
            ->getLanguageConverter( $parser->getTargetLanguage() );
    }

    /**
     * Override the title of the page when viewed, provided we've been given a
     * title which will normalise to the canonical title
     *
     * @param Parser $parser Parent parser
     * @param string $text Desired title text
     * @param string $uarg
     * @return string
     */
    public static function displaytitle( $parser, $text = '', $uarg = '' ) {
        global $wgRestrictDisplayTitle;

        static $magicWords = null;
        if ( $magicWords === null ) {
            $magicWords = $parser->getMagicWordFactory()->newArray(
                [ 'displaytitle_noerror', 'displaytitle_noreplace' ] );
        }
        $arg = $magicWords->matchStartToEnd( $uarg );

        // parse a limited subset of wiki markup (just the single quote items)
        $text = $parser->doQuotes( $text );

        // remove stripped text (e.g. the UNIQ-QINU stuff) that was generated by tag extensions/whatever
        $text = $parser->killMarkers( $text );

        // list of disallowed tags for DISPLAYTITLE
        // these will be escaped even though they are allowed in normal wiki text
        $bad = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
            'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' ];

        // disallow some styles that could be used to bypass $wgRestrictDisplayTitle
        if ( $wgRestrictDisplayTitle ) {
            $htmlTagsCallback = function ( &$params ) {
                $decoded = Sanitizer::decodeTagAttributes( $params );

                if ( isset( $decoded['style'] ) ) {
                    // this is called later anyway, but we need it right now for the regexes below to be safe
                    // calling it twice doesn't hurt
                    $decoded['style'] = Sanitizer::checkCss( $decoded['style'] );

                    if ( preg_match( '/(display|user-select|visibility)\s*:/i', $decoded['style'] ) ) {
                        $decoded['style'] = '/* attempt to bypass $wgRestrictDisplayTitle */';
                    }
                }

                $params = Sanitizer::safeEncodeTagAttributes( $decoded );
            };
        } else {
            $htmlTagsCallback = null;
        }

        // only requested titles that normalize to the actual title are allowed through
        // if $wgRestrictDisplayTitle is true (it is by default)
        // mimic the escaping process that occurs in OutputPage::setPageTitle
        $text = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags(
            $text,
            $htmlTagsCallback,
            [],
            [],
            $bad
        ) );
        $title = Title::newFromText( Sanitizer::stripAllTags( $text ) );

        if ( !$wgRestrictDisplayTitle ||
            ( $title instanceof Title
            && !$title->hasFragment()
            && $title->equals( $parser->getTitle() ) )
        ) {
            $old = $parser->mOutput->getProperty( 'displaytitle' );
            if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
                $parser->mOutput->setDisplayTitle( $text );
            }
            if ( $old !== false && $old !== $text && !$arg ) {

                $converter = self::getTargetLanguageConverter( $parser );
                return '<span class="error">' .
                    wfMessage( 'duplicate-displaytitle',
                        // Message should be parsed, but these params should only be escaped.
                        $converter->markNoConversion( wfEscapeWikiText( $old ) ),
                        $converter->markNoConversion( wfEscapeWikiText( $text ) )
                    )->inContentLanguage()->text() .
                    '</span>';
            } else {
                return '';
            }
        } else {
            $parser->getOutput()->addWarning(
                wfMessage( 'restricted-displaytitle',
                    // Message should be parsed, but this param should only be escaped.
                    wfEscapeWikiText( $text )
                )->text()
            );
            $parser->addTrackingCategory( 'restricted-displaytitle-ignored' );
        }
    }

    /**
     * Matches the given value against the value of given magic word
     *
     * @param MagicWordFactory $magicWordFactory A factory to get the word from, e.g., from
     *   $parser->getMagicWordFactory()
     * @param string $magicword Magic word key
     * @param string $value Value to match
     * @return bool True on successful match
     */
    private static function matchAgainstMagicword(
        MagicWordFactory $magicWordFactory, $magicword, $value
    ) {
        $value = trim( strval( $value ) );
        if ( $value === '' ) {
            return false;
        }
        $mwObject = $magicWordFactory->get( $magicword );
        return $mwObject->matchStartToEnd( $value );
    }

    /**
     * Formats a number according to a language.
     *
     * @param int|float $num
     * @param string $raw
     * @param Language|StubUserLang $language
     * @param MagicWordFactory|null $magicWordFactory To evaluate $raw
     * @return string
     */
    public static function formatRaw(
        $num, $raw, $language, MagicWordFactory $magicWordFactory = null
    ) {
        if ( $raw !== null && !$magicWordFactory ) {
            $magicWordFactory = MediaWikiServices::getInstance()->getMagicWordFactory();
        }
        if (
            $raw !== null && self::matchAgainstMagicword( $magicWordFactory, 'rawsuffix', $raw )
        ) {
            return $num;
        } else {
            return $language->formatNum( $num );
        }
    }

    public static function numberofpages( $parser, $raw = null ) {
        return self::formatRaw( SiteStats::pages(), $raw, $parser->getFunctionLang() );
    }

    public static function numberofusers( $parser, $raw = null ) {
        return self::formatRaw( SiteStats::users(), $raw, $parser->getFunctionLang() );
    }

    public static function numberofactiveusers( $parser, $raw = null ) {
        return self::formatRaw( SiteStats::activeUsers(), $raw, $parser->getFunctionLang() );
    }

    public static function numberofarticles( $parser, $raw = null ) {
        return self::formatRaw( SiteStats::articles(), $raw, $parser->getFunctionLang() );
    }

    public static function numberoffiles( $parser, $raw = null ) {
        return self::formatRaw( SiteStats::images(), $raw, $parser->getFunctionLang() );
    }

    public static function numberofadmins( $parser, $raw = null ) {
        return self::formatRaw(
            SiteStats::numberingroup( 'sysop' ),
            $raw,
            $parser->getFunctionLang()
        );
    }

    public static function numberofedits( $parser, $raw = null ) {
        return self::formatRaw( SiteStats::edits(), $raw, $parser->getFunctionLang() );
    }

    public static function pagesinnamespace( $parser, $namespace = 0, $raw = null ) {
        return self::formatRaw(
            SiteStats::pagesInNs( intval( $namespace ) ),
            $raw,
            $parser->getFunctionLang()
        );
    }

    public static function numberingroup( $parser, $name = '', $raw = null ) {
        return self::formatRaw(
            SiteStats::numberingroup( strtolower( $name ) ),
            $raw,
            $parser->getFunctionLang()
        );
    }

    /**
     * Given a title, return the namespace name that would be given by the
     * corresponding magic word
     * Note: function name changed to "mwnamespace" rather than "namespace"
     * to not break PHP 5.3
     * @param Parser $parser
     * @param string|null $title
     * @return mixed|string
     */
    public static function mwnamespace( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return str_replace( '_', ' ', $t->getNsText() );
    }

    public static function namespacee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfUrlencode( $t->getNsText() );
    }

    public static function namespacenumber( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return $t->getNamespace();
    }

    public static function talkspace( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null || !$t->canHaveTalkPage() ) {
            return '';
        }
        return str_replace( '_', ' ', $t->getTalkNsText() );
    }

    public static function talkspacee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null || !$t->canHaveTalkPage() ) {
            return '';
        }
        return wfUrlencode( $t->getTalkNsText() );
    }

    public static function subjectspace( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return str_replace( '_', ' ', $t->getSubjectNsText() );
    }

    public static function subjectspacee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfUrlencode( $t->getSubjectNsText() );
    }

    /**
     * Functions to get and normalize pagenames, corresponding to the magic words
     * of the same names
     * @param Parser $parser
     * @param string|null $title
     * @return string
     */
    public static function pagename( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( $t->getText() );
    }

    public static function pagenamee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( $t->getPartialURL() );
    }

    public static function fullpagename( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null || !$t->canHaveTalkPage() ) {
            return '';
        }
        return wfEscapeWikiText( $t->getPrefixedText() );
    }

    public static function fullpagenamee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null || !$t->canHaveTalkPage() ) {
            return '';
        }
        return wfEscapeWikiText( $t->getPrefixedURL() );
    }

    public static function subpagename( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( $t->getSubpageText() );
    }

    public static function subpagenamee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( $t->getSubpageUrlForm() );
    }

    public static function rootpagename( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( $t->getRootText() );
    }

    public static function rootpagenamee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getRootText() ) ) );
    }

    public static function basepagename( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( $t->getBaseText() );
    }

    public static function basepagenamee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( wfUrlencode( str_replace( ' ', '_', $t->getBaseText() ) ) );
    }

    public static function talkpagename( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null || !$t->canHaveTalkPage() ) {
            return '';
        }
        return wfEscapeWikiText( $t->getTalkPage()->getPrefixedText() );
    }

    public static function talkpagenamee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null || !$t->canHaveTalkPage() ) {
            return '';
        }
        return wfEscapeWikiText( $t->getTalkPage()->getPrefixedURL() );
    }

    public static function subjectpagename( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedText() );
    }

    public static function subjectpagenamee( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        return wfEscapeWikiText( $t->getSubjectPage()->getPrefixedURL() );
    }

    /**
     * Return the number of pages, files or subcats in the given category,
     * or 0 if it's nonexistent. This is an expensive parser function and
     * can't be called too many times per page.
     * @param Parser $parser
     * @param string $name
     * @param string|null $arg1
     * @param string|null $arg2
     * @return string
     */
    public static function pagesincategory( $parser, $name = '', $arg1 = null, $arg2 = null ) {
        static $magicWords = null;
        if ( $magicWords === null ) {
            $magicWords = $parser->getMagicWordFactory()->newArray( [
                'pagesincategory_all',
                'pagesincategory_pages',
                'pagesincategory_subcats',
                'pagesincategory_files'
            ] );
        }
        static $cache = [];

        // split the given option to its variable
        if ( self::matchAgainstMagicword( $parser->getMagicWordFactory(), 'rawsuffix', $arg1 ) ) {
            // {{pagesincategory:|raw[|type]}}
            $raw = $arg1;
            $type = $magicWords->matchStartToEnd( $arg2 );
        } else {
            // {{pagesincategory:[|type[|raw]]}}
            $type = $magicWords->matchStartToEnd( $arg1 );
            $raw = $arg2;
        }
        if ( !$type ) { // backward compatibility
            $type = 'pagesincategory_all';
        }

        $title = Title::makeTitleSafe( NS_CATEGORY, $name );
        if ( !$title ) { # invalid title
            return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
        }
        $parser->getContentLanguage()->findVariantLink( $name, $title, true );

        // Normalize name for cache
        $name = $title->getDBkey();

        if ( !isset( $cache[$name] ) ) {
            $category = Category::newFromTitle( $title );

            $allCount = $subcatCount = $fileCount = $pagesCount = 0;
            if ( $parser->incrementExpensiveFunctionCount() ) {
                // $allCount is the total number of cat members,
                // not the count of how many members are normal pages.
                $allCount = (int)$category->getPageCount();
                $subcatCount = (int)$category->getSubcatCount();
                $fileCount = (int)$category->getFileCount();
                $pagesCount = $allCount - $subcatCount - $fileCount;
            }
            $cache[$name]['pagesincategory_all'] = $allCount;
            $cache[$name]['pagesincategory_pages'] = $pagesCount;
            $cache[$name]['pagesincategory_subcats'] = $subcatCount;
            $cache[$name]['pagesincategory_files'] = $fileCount;
        }

        $count = $cache[$name][$type];
        return self::formatRaw( $count, $raw, $parser->getFunctionLang() );
    }

    /**
     * Return the size of the given page, or 0 if it's nonexistent.  This is an
     * expensive parser function and can't be called too many times per page.
     *
     * @param Parser $parser
     * @param string $page Name of page to check (Default: empty string)
     * @param string|null $raw Should number be human readable with commas or just number
     * @return string
     */
    public static function pagesize( $parser, $page = '', $raw = null ) {
        $title = Title::newFromText( $page );

        if ( !is_object( $title ) ) {
            return self::formatRaw( 0, $raw, $parser->getFunctionLang() );
        }

        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $title, 'vary-revision-sha1' );
        $length = $rev ? $rev->getSize() : 0;
        if ( $length === null ) {
            // We've had bugs where rev_len was not being recorded for empty pages, see T135414
            $length = 0;
        }
        return self::formatRaw( $length, $raw, $parser->getFunctionLang() );
    }

    /**
     * Returns the requested protection level for the current page. This
     * is an expensive parser function and can't be called too many times
     * per page, unless the protection levels/expiries for the given title
     * have already been retrieved
     *
     * @param Parser $parser
     * @param string $type
     * @param string $title
     *
     * @return string
     */
    public static function protectionlevel( $parser, $type = '', $title = '' ) {
        $titleObject = Title::newFromText( $title ) ?? $parser->getTitle();
        if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
            $restrictions = $titleObject->getRestrictions( strtolower( $type ) );
            # Title::getRestrictions returns an array, its possible it may have
            # multiple values in the future
            return implode( ',', $restrictions );
        }
        return '';
    }

    /**
     * Returns the requested protection expiry for the current page. This
     * is an expensive parser function and can't be called too many times
     * per page, unless the protection levels/expiries for the given title
     * have already been retrieved
     *
     * @param Parser $parser
     * @param string $type
     * @param string $title
     *
     * @return string
     */
    public static function protectionexpiry( $parser, $type = '', $title = '' ) {
        $titleObject = Title::newFromText( $title ) ?? $parser->getTitle();
        if ( $titleObject->areRestrictionsLoaded() || $parser->incrementExpensiveFunctionCount() ) {
            $expiry = $titleObject->getRestrictionExpiry( strtolower( $type ) );
            // getRestrictionExpiry() returns false on invalid type; trying to
            // match protectionlevel() function that returns empty string instead
            if ( $expiry === false ) {
                $expiry = '';
            }
            return $expiry;
        }
        return '';
    }

    /**
     * Gives language names.
     * @param Parser $parser
     * @param string $code Language code (of which to get name)
     * @param string $inLanguage Language code (in which to get name)
     * @return string
     */
    public static function language( $parser, $code = '', $inLanguage = '' ) {
        $code = strtolower( $code );
        $inLanguage = strtolower( $inLanguage );
        $lang = MediaWikiServices::getInstance()
            ->getLanguageNameUtils()
            ->getLanguageName( $code, $inLanguage );
        return $lang !== '' ? $lang : LanguageCode::bcp47( $code );
    }

    /**
     * Unicode-safe str_pad with the restriction that $length is forced to be <= 500
     * @param Parser $parser
     * @param string $string
     * @param string $length
     * @param string $padding
     * @param int $direction
     * @return string
     */
    public static function pad(
        $parser, $string, $length, $padding = '0', $direction = STR_PAD_RIGHT
    ) {
        $padding = $parser->killMarkers( $padding );
        $lengthOfPadding = mb_strlen( $padding );
        if ( $lengthOfPadding == 0 ) {
            return $string;
        }

        # The remaining length to add counts down to 0 as padding is added
        $length = min( (int)$length, 500 ) - mb_strlen( $string );
        if ( $length <= 0 ) {
            // Nothing to add
            return $string;
        }

        # $finalPadding is just $padding repeated enough times so that
        # mb_strlen( $string ) + mb_strlen( $finalPadding ) == $length
        $finalPadding = '';
        while ( $length > 0 ) {
            # If $length < $lengthofPadding, truncate $padding so we get the
            # exact length desired.
            $finalPadding .= mb_substr( $padding, 0, $length );
            $length -= $lengthOfPadding;
        }

        if ( $direction == STR_PAD_LEFT ) {
            return $finalPadding . $string;
        } else {
            return $string . $finalPadding;
        }
    }

    public static function padleft( $parser, $string = '', $length = 0, $padding = '0' ) {
        return self::pad( $parser, $string, $length, $padding, STR_PAD_LEFT );
    }

    public static function padright( $parser, $string = '', $length = 0, $padding = '0' ) {
        return self::pad( $parser, $string, $length, $padding );
    }

    /**
     * @param Parser $parser
     * @param string $text
     * @return string
     */
    public static function anchorencode( $parser, $text ) {
        $text = $parser->killMarkers( $text );
        $section = (string)substr( $parser->guessSectionNameFromWikiText( $text ), 1 );
        return Sanitizer::safeEncodeAttribute( $section );
    }

    public static function special( $parser, $text ) {
        list( $page, $subpage ) = MediaWikiServices::getInstance()->getSpecialPageFactory()->
            resolveAlias( $text );
        if ( $page ) {
            $title = SpecialPage::getTitleFor( $page, $subpage );
            return $title->getPrefixedText();
        } else {
            // unknown special page, just use the given text as its title, if at all possible
            $title = Title::makeTitleSafe( NS_SPECIAL, $text );
            return $title ? $title->getPrefixedText() : self::special( $parser, 'Badtitle' );
        }
    }

    public static function speciale( $parser, $text ) {
        return wfUrlencode( str_replace( ' ', '_', self::special( $parser, $text ) ) );
    }

    /**
     * @param Parser $parser
     * @param string $text The sortkey to use
     * @param string $uarg Either "noreplace" or "noerror" (in en)
     *   both suppress errors, and noreplace does nothing if
     *   a default sortkey already exists.
     * @return string
     */
    public static function defaultsort( $parser, $text, $uarg = '' ) {
        static $magicWords = null;
        if ( $magicWords === null ) {
            $magicWords = $parser->getMagicWordFactory()->newArray(
                [ 'defaultsort_noerror', 'defaultsort_noreplace' ] );
        }
        $arg = $magicWords->matchStartToEnd( $uarg );

        $text = trim( $text );
        if ( strlen( $text ) == 0 ) {
            return '';
        }
        $old = $parser->getCustomDefaultSort();
        if ( $old === false || $arg !== 'defaultsort_noreplace' ) {
            $parser->setDefaultSort( $text );
        }

        if ( $old === false || $old == $text || $arg ) {
            return '';
        } else {
            $converter = $parser->getTargetLanguage()->getConverter();
            return '<span class="error">' .
                wfMessage( 'duplicate-defaultsort',
                    // Message should be parsed, but these params should only be escaped.
                    $converter->markNoConversion( wfEscapeWikiText( $old ) ),
                    $converter->markNoConversion( wfEscapeWikiText( $text ) )
                )->inContentLanguage()->text() .
                '</span>';
        }
    }

    /**
     * Usage {{filepath|300}}, {{filepath|nowiki}}, {{filepath|nowiki|300}}
     * or {{filepath|300|nowiki}} or {{filepath|300px}}, {{filepath|200x300px}},
     * {{filepath|nowiki|200x300px}}, {{filepath|200x300px|nowiki}}.
     *
     * @param Parser $parser
     * @param string $name
     * @param string $argA
     * @param string $argB
     * @return array|string
     */
    public static function filepath( $parser, $name = '', $argA = '', $argB = '' ) {
        $file = MediaWikiServices::getInstance()->getRepoGroup()->findFile( $name );

        if ( $argA == 'nowiki' ) {
            // {{filepath: | option [| size] }}
            $isNowiki = true;
            $parsedWidthParam = Parser::parseWidthParam( $argB );
        } else {
            // {{filepath: [| size [|option]] }}
            $parsedWidthParam = Parser::parseWidthParam( $argA );
            $isNowiki = ( $argB == 'nowiki' );
        }

        if ( $file ) {
            $url = $file->getFullUrl();

            // If a size is requested...
            if ( count( $parsedWidthParam ) ) {
                $mto = $file->transform( $parsedWidthParam );
                // ... and we can
                if ( $mto && !$mto->isError() ) {
                    // ... change the URL to point to a thumbnail.
                    $url = wfExpandUrl( $mto->getUrl(), PROTO_RELATIVE );
                }
            }
            if ( $isNowiki ) {
                return [ $url, 'nowiki' => true ];
            }
            return $url;
        } else {
            return '';
        }
    }

    /**
     * Parser function to extension tag adaptor
     * @param Parser $parser
     * @param PPFrame $frame
     * @param PPNode[] $args
     * @return string
     */
    public static function tagObj( $parser, $frame, $args ) {
        if ( !count( $args ) ) {
            return '';
        }
        $tagName = strtolower( trim( $frame->expand( array_shift( $args ) ) ) );

        if ( count( $args ) ) {
            $inner = $frame->expand( array_shift( $args ) );
        } else {
            $inner = null;
        }

        $attributes = [];
        foreach ( $args as $arg ) {
            $bits = $arg->splitArg();
            if ( strval( $bits['index'] ) === '' ) {
                $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
                $value = trim( $frame->expand( $bits['value'] ) );
                if ( preg_match( '/^(?:["\'](.+)["\']|""|\'\')$/s', $value, $m ) ) {
                    $value = $m[1] ?? '';
                }
                $attributes[$name] = $value;
            }
        }

        $stripList = $parser->getStripList();
        if ( !in_array( $tagName, $stripList ) ) {
            // we can't handle this tag (at least not now), so just re-emit it as an ordinary tag
            $attrText = '';
            foreach ( $attributes as $name => $value ) {
                $attrText .= ' ' . htmlspecialchars( $name ) . '="' . htmlspecialchars( $value ) . '"';
            }
            if ( $inner === null ) {
                return "<$tagName$attrText/>";
            }
            return "<$tagName$attrText>$inner</$tagName>";
        }

        $params = [
            'name' => $tagName,
            'inner' => $inner,
            'attributes' => $attributes,
            'close' => "</$tagName>",
        ];
        return $parser->extensionSubstitution( $params, $frame );
    }

    /**
     * Fetched the current revision of the given title and return this.
     * Will increment the expensive function count and
     * add a template link to get the value refreshed on changes.
     * For a given title, which is equal to the current parser title,
     * the revision object from the parser is used, when that is the current one
     *
     * @param Parser $parser
     * @param Title $title
     * @param string $vary ParserOuput vary-* flag
     * @return RevisionRecord|null
     * @since 1.23
     */
    private static function getCachedRevisionObject( $parser, $title, $vary ) {
        if ( !$title ) {
            return null;
        }

        $revisionRecord = null;

        $isSelfReferential = $title->equals( $parser->getTitle() );
        if ( $isSelfReferential ) {
            // Revision is for the same title that is currently being parsed. Only use the last
            // saved revision, regardless of Parser::getRevisionId() or fake revision injection
            // callbacks against the current title.
            $parserRevisionRecord = $parser->getRevisionRecordObject();
            if ( $parserRevisionRecord && $parserRevisionRecord->isCurrent() ) {
                $revisionRecord = $parserRevisionRecord;
            }
        }

        $parserOutput = $parser->getOutput();
        if ( !$revisionRecord ) {
            if (
                !$parser->isCurrentRevisionOfTitleCached( $title ) &&
                !$parser->incrementExpensiveFunctionCount()
            ) {
                return null; // not allowed
            }
            // Get the current revision, ignoring Parser::getRevisionId() being null/old
            $revisionRecord = $parser->fetchCurrentRevisionRecordOfTitle( $title );
            if ( !$revisionRecord ) {
                // Convert `false` error return to `null`
                $revisionRecord = null;
            }
            // Register dependency in templatelinks
            $parserOutput->addTemplate(
                $title,
                $revisionRecord ? $revisionRecord->getPageId() : 0,
                $revisionRecord ? $revisionRecord->getId() : 0
            );
        }

        if ( $isSelfReferential ) {
            wfDebug( __METHOD__ . ": used current revision, setting $vary" );
            // Upon page save, the result of the parser function using this might change
            $parserOutput->setFlag( $vary );
            if ( $vary === 'vary-revision-sha1' && $revisionRecord ) {
                try {
                    $sha1 = $revisionRecord->getSha1();
                } catch ( RevisionAccessException $e ) {
                    $sha1 = null;
                }
                $parserOutput->setRevisionUsedSha1Base36( $sha1 );
            }
        }

        return $revisionRecord;
    }

    /**
     * Get the pageid of a specified page
     * @param Parser $parser
     * @param string|null $title Title to get the pageid from
     * @return int|null|string
     * @since 1.23
     */
    public static function pageid( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( !$t ) {
            return '';
        } elseif ( !$t->canExist() || $t->isExternal() ) {
            return 0; // e.g. special page or interwiki link
        }

        $parserOutput = $parser->getOutput();

        if ( $t->equals( $parser->getTitle() ) ) {
            // Revision is for the same title that is currently being parsed.
            // Use the title from Parser in case a new page ID was injected into it.
            $parserOutput->setFlag( 'vary-page-id' );
            $id = $parser->getTitle()->getArticleID();
            if ( $id ) {
                $parserOutput->setSpeculativePageIdUsed( $id );
            }

            return $id;
        }

        // Check the link cache for the title
        $linkCache = MediaWikiServices::getInstance()->getLinkCache();
        $pdbk = $t->getPrefixedDBkey();
        $id = $linkCache->getGoodLinkID( $pdbk );
        if ( $id != 0 || $linkCache->isBadLink( $pdbk ) ) {
            $parserOutput->addLink( $t, $id );

            return $id;
        }

        // We need to load it from the DB, so mark expensive
        if ( $parser->incrementExpensiveFunctionCount() ) {
            $id = $t->getArticleID();
            $parserOutput->addLink( $t, $id );

            return $id;
        }

        return null;
    }

    /**
     * Get the id from the last revision of a specified page.
     * @param Parser $parser
     * @param string|null $title Title to get the id from
     * @return int|null|string
     * @since 1.23
     */
    public static function revisionid( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }

        $services = MediaWikiServices::getInstance();
        if (
            $t->equals( $parser->getTitle() ) &&
            $services->getMainConfig()->get( 'MiserMode' ) &&
            !$parser->getOptions()->getInterfaceMessage() &&
            // @TODO: disallow this word on all namespaces (T235957)
            $services->getNamespaceInfo()->isSubject( $t->getNamespace() )
        ) {
            // Use a stub result instead of the actual revision ID in order to avoid
            // double parses on page save but still allow preview detection (T137900)
            if ( $parser->getRevisionId() || $parser->getOptions()->getSpeculativeRevId() ) {
                return '-';
            } else {
                $parser->getOutput()->setFlag( 'vary-revision-exists' );
                return '';
            }
        }
        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $t, 'vary-revision-id' );
        return $rev ? $rev->getId() : '';
    }

    /**
     * Get the day from the last revision of a specified page.
     * @param Parser $parser
     * @param string|null $title Title to get the day from
     * @return string
     * @since 1.23
     */
    public static function revisionday( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $t, 'vary-revision-timestamp' );
        return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'j' ) : '';
    }

    /**
     * Get the day with leading zeros from the last revision of a specified page.
     * @param Parser $parser
     * @param string|null $title Title to get the day from
     * @return string
     * @since 1.23
     */
    public static function revisionday2( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $t, 'vary-revision-timestamp' );
        return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'd' ) : '';
    }

    /**
     * Get the month with leading zeros from the last revision of a specified page.
     * @param Parser $parser
     * @param string|null $title Title to get the month from
     * @return string
     * @since 1.23
     */
    public static function revisionmonth( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $t, 'vary-revision-timestamp' );
        return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'm' ) : '';
    }

    /**
     * Get the month from the last revision of a specified page.
     * @param Parser $parser
     * @param string|null $title Title to get the month from
     * @return string
     * @since 1.23
     */
    public static function revisionmonth1( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $t, 'vary-revision-timestamp' );
        return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'n' ) : '';
    }

    /**
     * Get the year from the last revision of a specified page.
     * @param Parser $parser
     * @param string|null $title Title to get the year from
     * @return string
     * @since 1.23
     */
    public static function revisionyear( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $t, 'vary-revision-timestamp' );
        return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'Y' ) : '';
    }

    /**
     * Get the timestamp from the last revision of a specified page.
     * @param Parser $parser
     * @param string|null $title Title to get the timestamp from
     * @return string
     * @since 1.23
     */
    public static function revisiontimestamp( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $t, 'vary-revision-timestamp' );
        return $rev ? MWTimestamp::getLocalInstance( $rev->getTimestamp() )->format( 'YmdHis' ) : '';
    }

    /**
     * Get the user from the last revision of a specified page.
     * @param Parser $parser
     * @param string|null $title Title to get the user from
     * @return string
     * @since 1.23
     */
    public static function revisionuser( $parser, $title = null ) {
        $t = Title::newFromText( $title );
        if ( $t === null ) {
            return '';
        }
        // fetch revision from cache/database and return the value
        $rev = self::getCachedRevisionObject( $parser, $t, 'vary-user' );
        if ( $rev === null ) {
            return '';
        }
        $user = $rev->getUser();
        return $user ? $user->getName() : '';
    }

    /**
     * Returns the sources of any cascading protection acting on a specified page.
     * Pages will not return their own title unless they transclude themselves.
     * This is an expensive parser function and can't be called too many times per page,
     * unless cascading protection sources for the page have already been loaded.
     *
     * @param Parser $parser
     * @param string $title
     *
     * @return string
     * @since 1.23
     */
    public static function cascadingsources( $parser, $title = '' ) {
        $titleObject = Title::newFromText( $title ) ?? $parser->getTitle();
        if ( $titleObject->areCascadeProtectionSourcesLoaded()
            || $parser->incrementExpensiveFunctionCount()
        ) {
            $names = [];
            $sources = $titleObject->getCascadeProtectionSources();
            foreach ( $sources[0] as $sourceTitle ) {
                $names[] = $sourceTitle->getPrefixedText();
            }
            return implode( '|', $names );
        }
        return '';
    }

}