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[mediawiki.git] / includes / parser / ParserOptions.php

<?php
/**
 * Options for the PHP parser
 *
 * 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
 */

namespace MediaWiki\Parser;

use InvalidArgumentException;
use LogicException;
use MediaWiki\Content\Content;
use MediaWiki\Context\IContextSource;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\Language\Language;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Page\PageIdentityValue;
use MediaWiki\Page\PageRecord;
use MediaWiki\Revision\MutableRevisionRecord;
use MediaWiki\Revision\SlotRecord;
use MediaWiki\StubObject\StubObject;
use MediaWiki\Title\Title;
use MediaWiki\User\UserIdentity;
use MediaWiki\User\UserIdentityValue;
use MediaWiki\Utils\MWTimestamp;
use ReflectionClass;
use Wikimedia\IPUtils;
use Wikimedia\ScopedCallback;

/**
 * @brief Set options of the Parser
 *
 * How to add an option in core:
 *  1. Add it to one of the arrays in ParserOptions::setDefaults()
 *  2. If necessary, add an entry to ParserOptions::$inCacheKey
 *  3. Add a getter and setter in the section for that.
 *
 * How to add an option in an extension:
 *  1. Use the 'ParserOptionsRegister' hook to register it.
 *  2. Where necessary, use $popt->getOption() and $popt->setOption()
 *     to access it.
 *
 * @ingroup Parser
 */
class ParserOptions {

        /**
         * Default values for all options that are relevant for caching.
         * @see self::getDefaults()
         * @var array|null
         */
        private static $defaults = null;

        /**
         * Lazy-loaded options
         * @var callable[]|null
         */
        private static $lazyOptions = null;

        /**
         * Initial lazy-loaded options (before hook)
         * @var callable[]
         */
        private static $initialLazyOptions = [
                'dateformat' => [ __CLASS__, 'initDateFormat' ],
                'speculativeRevId' => [ __CLASS__, 'initSpeculativeRevId' ],
                'speculativePageId' => [ __CLASS__, 'initSpeculativePageId' ],
        ];

        /**
         * Specify options that are included in the cache key
         * @var array|null
         */
        private static $cacheVaryingOptionsHash = null;

        /**
         * Initial inCacheKey options (before hook)
         * @var array
         */
        private static $initialCacheVaryingOptionsHash = [
                'dateformat' => true,
                'thumbsize' => true,
                'printable' => true,
                'userlang' => true,
                'useParsoid' => true,
                'suppressSectionEditLinks' => true,
                'collapsibleSections' => true,
        ];

        /**
         * Specify pseudo-options that are actually callbacks.
         * These must be ignored when checking for cacheability.
         * @var array
         */
        private static $callbacks = [
                'currentRevisionRecordCallback' => true,
                'templateCallback' => true,
                'speculativeRevIdCallback' => true,
                'speculativePageIdCallback' => true,
        ];

        /**
         * Current values for all options that are relevant for caching.
         * @var array
         */
        private $options;

        /**
         * Timestamp used for {{CURRENTDAY}} etc.
         * @var string|null
         * @note Caching based on parse time is handled externally
         */
        private $mTimestamp;

        /**
         * Stored user object
         * @var UserIdentity
         * @todo Track this for caching somehow without fragmenting the cache
         */
        private $mUser;

        /**
         * Function to be called when an option is accessed.
         * @var callable|null
         * @note Used for collecting used options, does not affect caching
         */
        private $onAccessCallback = null;

        /**
         * If the page being parsed is a redirect, this should hold the redirect
         * target.
         * @var Title|null
         * @todo Track this for caching somehow
         */
        private $redirectTarget = null;

        /**
         * Appended to the options hash
         * @var string
         */
        private $mExtraKey = '';

        /**
         * The reason for rendering the content.
         * @var string
         */
        private $renderReason = 'unknown';

        /**
         * Fetch an option and track that is was accessed
         * @since 1.30
         * @param string $name Option name
         * @return mixed
         */
        public function getOption( $name ) {
                if ( !array_key_exists( $name, $this->options ) ) {
                        throw new InvalidArgumentException( "Unknown parser option $name" );
                }

                $this->lazyLoadOption( $name );
                $this->optionUsed( $name );
                return $this->options[$name];
        }

        /**
         * @param string $name Lazy load option without tracking usage
         */
        private function lazyLoadOption( $name ) {
                $lazyOptions = self::getLazyOptions();
                if ( isset( $lazyOptions[$name] ) && $this->options[$name] === null ) {
                        $this->options[$name] = call_user_func( $lazyOptions[$name], $this, $name );
                }
        }

        /**
         * Resets lazy loaded options to null in the provided $options array
         * @param array $options
         * @return array
         */
        private function nullifyLazyOption( array $options ): array {
                return array_fill_keys( array_keys( self::getLazyOptions() ), null ) + $options;
        }

        /**
         * Get lazy-loaded options.
         *
         * This array should be initialised by the constructor. The return type
         * hint is used as an assertion to ensure this has happened and to coerce
         * the type for static analysis.
         *
         * @internal Public for testing only
         *
         * @return array
         */
        public static function getLazyOptions(): array {
                // Trigger a call to the 'ParserOptionsRegister' hook if it hasn't
                // already been called.
                if ( self::$lazyOptions === null ) {
                        self::getDefaults();
                }
                return self::$lazyOptions;
        }

        /**
         * Get cache varying options, with the name of the option in the key, and a
         * boolean in the value which indicates whether the cache is indeed varied.
         *
         * @see self::allCacheVaryingOptions()
         *
         * @return array
         */
        private static function getCacheVaryingOptionsHash(): array {
                // Trigger a call to the 'ParserOptionsRegister' hook if it hasn't
                // already been called.
                if ( self::$cacheVaryingOptionsHash === null ) {
                        self::getDefaults();
                }
                return self::$cacheVaryingOptionsHash;
        }

        /**
         * Set an option, generically
         * @since 1.30
         * @param string $name Option name
         * @param mixed $value New value. Passing null will set null, unlike many
         *  of the existing accessors which ignore null for historical reasons.
         * @return mixed Old value
         */
        public function setOption( $name, $value ) {
                if ( !array_key_exists( $name, $this->options ) ) {
                        throw new InvalidArgumentException( "Unknown parser option $name" );
                }
                $old = $this->options[$name];
                $this->options[$name] = $value;
                return $old;
        }

        /**
         * Legacy implementation
         * @since 1.30 For implementing legacy setters only. Don't use this in new code.
         * @deprecated since 1.30
         * @param string $name Option name
         * @param mixed $value New value. Passing null does not set the value.
         * @return mixed Old value
         */
        protected function setOptionLegacy( $name, $value ) {
                if ( !array_key_exists( $name, $this->options ) ) {
                        throw new InvalidArgumentException( "Unknown parser option $name" );
                }
                return wfSetVar( $this->options[$name], $value );
        }

        /**
         * Whether to extract interlanguage links
         *
         * When true, interlanguage links will be returned by
         * ParserOutput::getLanguageLinks() instead of generating link HTML.
         *
         * @return bool
         */
        public function getInterwikiMagic() {
                return $this->getOption( 'interwikiMagic' );
        }

        /**
         * Specify whether to extract interlanguage links
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setInterwikiMagic( $x ) {
                return $this->setOptionLegacy( 'interwikiMagic', $x );
        }

        /**
         * Allow all external images inline?
         * @return bool
         */
        public function getAllowExternalImages() {
                return $this->getOption( 'allowExternalImages' );
        }

        /**
         * External images to allow
         *
         * When self::getAllowExternalImages() is false
         *
         * @return string|string[] URLs to allow
         */
        public function getAllowExternalImagesFrom() {
                return $this->getOption( 'allowExternalImagesFrom' );
        }

        /**
         * Use the on-wiki external image whitelist?
         * @return bool
         */
        public function getEnableImageWhitelist() {
                return $this->getOption( 'enableImageWhitelist' );
        }

        /**
         * Allow inclusion of special pages?
         * @return bool
         */
        public function getAllowSpecialInclusion() {
                return $this->getOption( 'allowSpecialInclusion' );
        }

        /**
         * Allow inclusion of special pages?
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setAllowSpecialInclusion( $x ) {
                return $this->setOptionLegacy( 'allowSpecialInclusion', $x );
        }

        /**
         * Parsing an interface message?
         * @return bool
         */
        public function getInterfaceMessage() {
                return $this->getOption( 'interfaceMessage' );
        }

        /**
         * Parsing an interface message?
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setInterfaceMessage( $x ) {
                return $this->setOptionLegacy( 'interfaceMessage', $x );
        }

        /**
         * Target language for the parse
         * @return Language|null
         */
        public function getTargetLanguage() {
                return $this->getOption( 'targetLanguage' );
        }

        /**
         * Target language for the parse
         * @param Language|null $x New value
         * @return Language|null Old value
         */
        public function setTargetLanguage( $x ) {
                return $this->setOption( 'targetLanguage', $x );
        }

        /**
         * Maximum size of template expansions, in bytes
         * @return int
         */
        public function getMaxIncludeSize() {
                return $this->getOption( 'maxIncludeSize' );
        }

        /**
         * Maximum size of template expansions, in bytes
         * @param int|null $x New value (null is no change)
         * @return int Old value
         */
        public function setMaxIncludeSize( $x ) {
                return $this->setOptionLegacy( 'maxIncludeSize', $x );
        }

        /**
         * Maximum number of nodes touched by PPFrame::expand()
         * @return int
         */
        public function getMaxPPNodeCount() {
                return $this->getOption( 'maxPPNodeCount' );
        }

        /**
         * Maximum number of nodes touched by PPFrame::expand()
         * @param int|null $x New value (null is no change)
         * @return int Old value
         */
        public function setMaxPPNodeCount( $x ) {
                return $this->setOptionLegacy( 'maxPPNodeCount', $x );
        }

        /**
         * Maximum recursion depth in PPFrame::expand()
         * @return int
         */
        public function getMaxPPExpandDepth() {
                return $this->getOption( 'maxPPExpandDepth' );
        }

        /**
         * Maximum recursion depth for templates within templates
         * @return int
         * @internal Only used by Parser (T318826)
         */
        public function getMaxTemplateDepth() {
                return $this->getOption( 'maxTemplateDepth' );
        }

        /**
         * Maximum recursion depth for templates within templates
         * @param int|null $x New value (null is no change)
         * @return int Old value
         * @internal Only used by ParserTestRunner (T318826)
         */
        public function setMaxTemplateDepth( $x ) {
                return $this->setOptionLegacy( 'maxTemplateDepth', $x );
        }

        /**
         * Maximum number of calls per parse to expensive parser functions
         * @since 1.20
         * @return int
         */
        public function getExpensiveParserFunctionLimit() {
                return $this->getOption( 'expensiveParserFunctionLimit' );
        }

        /**
         * Maximum number of calls per parse to expensive parser functions
         * @since 1.20
         * @param int|null $x New value (null is no change)
         * @return int Old value
         */
        public function setExpensiveParserFunctionLimit( $x ) {
                return $this->setOptionLegacy( 'expensiveParserFunctionLimit', $x );
        }

        /**
         * Remove HTML comments
         * @warning Only applies to preprocess operations
         * @return bool
         */
        public function getRemoveComments() {
                return $this->getOption( 'removeComments' );
        }

        /**
         * Remove HTML comments
         * @warning Only applies to preprocess operations
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setRemoveComments( $x ) {
                return $this->setOptionLegacy( 'removeComments', $x );
        }

        /**
         * @deprecated since 1.38. This does nothing now, to control limit reporting
         * please provide 'includeDebugInfo' option to ParserOutput::getText.
         *
         * Enable limit report in an HTML comment on output
         * @return bool
         */
        public function getEnableLimitReport() {
                return false;
        }

        /**
         * @deprecated since 1.38. This does nothing now, to control limit reporting
         * please provide 'includeDebugInfo' option to ParserOutput::getText.
         *
         * Enable limit report in an HTML comment on output
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function enableLimitReport( $x = true ) {
                return false;
        }

        /**
         * Clean up signature texts?
         * @see Parser::cleanSig
         * @return bool
         */
        public function getCleanSignatures() {
                return $this->getOption( 'cleanSignatures' );
        }

        /**
         * Clean up signature texts?
         * @see Parser::cleanSig
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setCleanSignatures( $x ) {
                return $this->setOptionLegacy( 'cleanSignatures', $x );
        }

        /**
         * Target attribute for external links
         * @return string|false
         * @internal Only set by installer (T317647)
         */
        public function getExternalLinkTarget() {
                return $this->getOption( 'externalLinkTarget' );
        }

        /**
         * Target attribute for external links
         * @param string|false|null $x New value (null is no change)
         * @return string Old value
         * @internal Only used by installer (T317647)
         */
        public function setExternalLinkTarget( $x ) {
                return $this->setOptionLegacy( 'externalLinkTarget', $x );
        }

        /**
         * Whether content conversion should be disabled
         * @return bool
         */
        public function getDisableContentConversion() {
                return $this->getOption( 'disableContentConversion' );
        }

        /**
         * Whether content conversion should be disabled
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function disableContentConversion( $x = true ) {
                return $this->setOptionLegacy( 'disableContentConversion', $x );
        }

        /**
         * Whether title conversion should be disabled
         * @return bool
         */
        public function getDisableTitleConversion() {
                return $this->getOption( 'disableTitleConversion' );
        }

        /**
         * Whether title conversion should be disabled
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function disableTitleConversion( $x = true ) {
                return $this->setOptionLegacy( 'disableTitleConversion', $x );
        }

        /**
         * Thumb size preferred by the user.
         * @return int
         */
        public function getThumbSize() {
                return $this->getOption( 'thumbsize' );
        }

        /**
         * Thumb size preferred by the user.
         * @param int|null $x New value (null is no change)
         * @return int Old value
         */
        public function setThumbSize( $x ) {
                return $this->setOptionLegacy( 'thumbsize', $x );
        }

        /**
         * Parsing the page for a "preview" operation?
         * @return bool
         */
        public function getIsPreview() {
                return $this->getOption( 'isPreview' );
        }

        /**
         * Parsing the page for a "preview" operation?
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setIsPreview( $x ) {
                return $this->setOptionLegacy( 'isPreview', $x );
        }

        /**
         * Parsing the page for a "preview" operation on a single section?
         * @return bool
         */
        public function getIsSectionPreview() {
                return $this->getOption( 'isSectionPreview' );
        }

        /**
         * Parsing the page for a "preview" operation on a single section?
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setIsSectionPreview( $x ) {
                return $this->setOptionLegacy( 'isSectionPreview', $x );
        }

        /**
         * Parsing the printable version of the page?
         * @return bool
         */
        public function getIsPrintable() {
                return $this->getOption( 'printable' );
        }

        /**
         * Parsing the printable version of the page?
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setIsPrintable( $x ) {
                return $this->setOptionLegacy( 'printable', $x );
        }

        /**
         * Transform wiki markup when saving the page?
         * @return bool
         */
        public function getPreSaveTransform() {
                return $this->getOption( 'preSaveTransform' );
        }

        /**
         * Transform wiki markup when saving the page?
         * @param bool|null $x New value (null is no change)
         * @return bool Old value
         */
        public function setPreSaveTransform( $x ) {
                return $this->setOptionLegacy( 'preSaveTransform', $x );
        }

        /**
         * Parsoid-format HTML output, or legacy wikitext parser HTML?
         * @see T300191
         * @unstable
         * @since 1.41
         * @return bool
         */
        public function getUseParsoid(): bool {
                return $this->getOption( 'useParsoid' );
        }

        /**
         * Request Parsoid-format HTML output.
         * @see T300191
         * @unstable
         * @since 1.41
         */
        public function setUseParsoid() {
                $this->setOption( 'useParsoid', true );
        }

        /**
         * Date format index
         * @return string
         */
        public function getDateFormat() {
                return $this->getOption( 'dateformat' );
        }

        /**
         * Lazy initializer for dateFormat
         * @param ParserOptions $popt
         * @return string
         */
        private static function initDateFormat( ParserOptions $popt ) {
                $userFactory = MediaWikiServices::getInstance()->getUserFactory();
                return $userFactory->newFromUserIdentity( $popt->getUserIdentity() )->getDatePreference();
        }

        /**
         * Date format index
         * @param string|null $x New value (null is no change)
         * @return string Old value
         */
        public function setDateFormat( $x ) {
                return $this->setOptionLegacy( 'dateformat', $x );
        }

        /**
         * Get the user language used by the parser for this page and split the parser cache.
         *
         * @warning Calling this causes the parser cache to be fragmented by user language!
         * To avoid cache fragmentation, output should not depend on the user language.
         * Use Parser::getTargetLanguage() instead!
         *
         * @note This function will trigger a cache fragmentation by recording the
         * 'userlang' option, see optionUsed(). This is done to avoid cache pollution
         * when the page is rendered based on the language of the user.
         *
         * @note When saving, this will return the default language instead of the user's.
         * {{int: }} uses this which used to produce inconsistent link tables (T16404).
         *
         * @return Language
         * @since 1.19
         */
        public function getUserLangObj() {
                return $this->getOption( 'userlang' );
        }

        /**
         * Same as getUserLangObj() but returns a string instead.
         *
         * @warning Calling this causes the parser cache to be fragmented by user language!
         * To avoid cache fragmentation, output should not depend on the user language.
         * Use Parser::getTargetLanguage() instead!
         *
         * @see getUserLangObj()
         *
         * @return string Language code
         * @since 1.17
         */
        public function getUserLang() {
                return $this->getUserLangObj()->getCode();
        }

        /**
         * Set the user language used by the parser for this page and split the parser cache.
         * @param string|Language $x New value
         * @return Language Old value
         */
        public function setUserLang( $x ) {
                if ( is_string( $x ) ) {
                        $x = MediaWikiServices::getInstance()->getLanguageFactory()->getLanguage( $x );
                }

                return $this->setOptionLegacy( 'userlang', $x );
        }

        /**
         * Are magic ISBN links enabled?
         * @since 1.28
         * @return bool
         */
        public function getMagicISBNLinks() {
                return $this->getOption( 'magicISBNLinks' );
        }

        /**
         * Are magic PMID links enabled?
         * @since 1.28
         * @return bool
         */
        public function getMagicPMIDLinks() {
                return $this->getOption( 'magicPMIDLinks' );
        }

        /**
         * Are magic RFC links enabled?
         * @since 1.28
         * @return bool
         */
        public function getMagicRFCLinks() {
                return $this->getOption( 'magicRFCLinks' );
        }

        /**
         * Should the table of contents be suppressed?
         * Used when parsing "code" pages (like JavaScript) as wikitext
         * for backlink support and categories, but where we don't want
         * other metadata generated (like the table of contents).
         * @see T307691
         * @since 1.39
         * @return bool
         */
        public function getSuppressTOC() {
                return $this->getOption( 'suppressTOC' );
        }

        /**
         * Suppress generation of the table of contents.
         * Used when parsing "code" pages (like JavaScript) as wikitext
         * for backlink support and categories, but where we don't want
         * other metadata generated (like the table of contents).
         * @see T307691
         * @since 1.39
         * @deprecated since 1.42; just clear the metadata in the final
         *  parser output
         */
        public function setSuppressTOC() {
                wfDeprecated( __METHOD__, '1.42' );
                $this->setOption( 'suppressTOC', true );
        }

        /**
         * Should section edit links be suppressed?
         * Used when parsing wikitext which will be presented in a
         * non-interactive context: previews, UX text, etc.
         * @since 1.42
         * @return bool
         */
        public function getSuppressSectionEditLinks() {
                return $this->getOption( 'suppressSectionEditLinks' );
        }

        /**
         * Suppress section edit links in the output.
         * Used when parsing wikitext which will be presented in a
         * non-interactive context: previews, UX text, etc.
         * @since 1.42
         */
        public function setSuppressSectionEditLinks() {
                $this->setOption( 'suppressSectionEditLinks', true );
        }

        /**
         * Should section contents be wrapped in <div> to make them
         * collapsible?
         * @since 1.42
         */
        public function getCollapsibleSections(): bool {
                return $this->getOption( 'collapsibleSections' );
        }

        /**
         * Wrap section contents in a <div> to allow client-side code
         * to collapse them.
         * @since 1.42
         */
        public function setCollapsibleSections(): void {
                $this->setOption( 'collapsibleSections', true );
        }

        /**
         * If the wiki is configured to allow raw html ($wgRawHtml = true)
         * is it allowed in the specific case of parsing this page.
         *
         * This is meant to disable unsafe parser tags in cases where
         * a malicious user may control the input to the parser.
         *
         * @note This is expected to be true for normal pages even if the
         *  wiki has $wgRawHtml disabled in general. The setting only
         *  signifies that raw html would be unsafe in the current context
         *  provided that raw html is allowed at all.
         * @since 1.29
         * @return bool
         */
        public function getAllowUnsafeRawHtml() {
                return $this->getOption( 'allowUnsafeRawHtml' );
        }

        /**
         * If the wiki is configured to allow raw html ($wgRawHtml = true)
         * is it allowed in the specific case of parsing this page.
         * @see self::getAllowUnsafeRawHtml()
         * @since 1.29
         * @param bool|null $x Value to set or null to get current value
         * @return bool Current value for allowUnsafeRawHtml
         */
        public function setAllowUnsafeRawHtml( $x ) {
                return $this->setOptionLegacy( 'allowUnsafeRawHtml', $x );
        }

        /**
         * Class to use to wrap output from Parser::parse()
         * @since 1.30
         * @return string|false
         */
        public function getWrapOutputClass() {
                return $this->getOption( 'wrapclass' );
        }

        /**
         * CSS class to use to wrap output from Parser::parse()
         * @since 1.30
         * @param string $className Class name to use for wrapping.
         *   Passing false to indicate "no wrapping" was deprecated in MediaWiki 1.31.
         * @return string|false Current value
         */
        public function setWrapOutputClass( $className ) {
                if ( $className === true ) { // DWIM, they probably want the default class name
                        $className = 'mw-parser-output';
                }
                if ( $className === false ) {
                        wfDeprecated( __METHOD__ . '( false )', '1.31' );
                }
                return $this->setOption( 'wrapclass', $className );
        }

        /**
         * Callback for current revision fetching; first argument to call_user_func().
         * @internal
         * @since 1.35
         * @return callable
         */
        public function getCurrentRevisionRecordCallback() {
                return $this->getOption( 'currentRevisionRecordCallback' );
        }

        /**
         * Callback for current revision fetching; first argument to call_user_func().
         * @internal
         * @since 1.35
         * @param callable|null $x New value
         * @return callable Old value
         */
        public function setCurrentRevisionRecordCallback( $x ) {
                return $this->setOption( 'currentRevisionRecordCallback', $x );
        }

        /**
         * Callback for template fetching; first argument to call_user_func().
         * @return callable
         */
        public function getTemplateCallback() {
                return $this->getOption( 'templateCallback' );
        }

        /**
         * Callback for template fetching; first argument to call_user_func().
         * @param callable|null $x New value (null is no change)
         * @return callable Old value
         */
        public function setTemplateCallback( $x ) {
                return $this->setOptionLegacy( 'templateCallback', $x );
        }

        /**
         * A guess for {{REVISIONID}}, calculated using the callback provided via
         * setSpeculativeRevIdCallback(). For consistency, the value will be calculated upon the
         * first call of this method, and re-used for subsequent calls.
         *
         * If no callback was defined via setSpeculativeRevIdCallback(), this method will return false.
         *
         * @since 1.32
         * @return int|false
         */
        public function getSpeculativeRevId() {
                return $this->getOption( 'speculativeRevId' );
        }

        /**
         * A guess for {{PAGEID}}, calculated using the callback provided via
         * setSpeculativeRevPageCallback(). For consistency, the value will be calculated upon the
         * first call of this method, and re-used for subsequent calls.
         *
         * If no callback was defined via setSpeculativePageIdCallback(), this method will return false.
         *
         * @since 1.34
         * @return int|false
         */
        public function getSpeculativePageId() {
                return $this->getOption( 'speculativePageId' );
        }

        /**
         * Callback registered with ParserOptions::$lazyOptions, triggered by getSpeculativeRevId().
         *
         * @param ParserOptions $popt
         * @return int|false
         */
        private static function initSpeculativeRevId( ParserOptions $popt ) {
                $cb = $popt->getOption( 'speculativeRevIdCallback' );
                $id = $cb ? $cb() : null;

                // returning null would result in this being re-called every access
                return $id ?? false;
        }

        /**
         * Callback registered with ParserOptions::$lazyOptions, triggered by getSpeculativePageId().
         *
         * @param ParserOptions $popt
         * @return int|false
         */
        private static function initSpeculativePageId( ParserOptions $popt ) {
                $cb = $popt->getOption( 'speculativePageIdCallback' );
                $id = $cb ? $cb() : null;

                // returning null would result in this being re-called every access
                return $id ?? false;
        }

        /**
         * Callback to generate a guess for {{REVISIONID}}
         * @param callable|null $x New value
         * @return callable|null Old value
         * @since 1.28
         */
        public function setSpeculativeRevIdCallback( $x ) {
                $this->setOption( 'speculativeRevId', null ); // reset
                return $this->setOption( 'speculativeRevIdCallback', $x );
        }

        /**
         * Callback to generate a guess for {{PAGEID}}
         * @param callable|null $x New value
         * @return callable|null Old value
         * @since 1.34
         */
        public function setSpeculativePageIdCallback( $x ) {
                $this->setOption( 'speculativePageId', null ); // reset
                return $this->setOption( 'speculativePageIdCallback', $x );
        }

        /**
         * Timestamp used for {{CURRENTDAY}} etc.
         * @return string TS_MW timestamp
         */
        public function getTimestamp() {
                if ( $this->mTimestamp === null ) {
                        $this->mTimestamp = wfTimestampNow();
                }
                return $this->mTimestamp;
        }

        /**
         * Timestamp used for {{CURRENTDAY}} etc.
         * @param string|null $x New value (null is no change)
         * @return string Old value
         */
        public function setTimestamp( $x ) {
                return wfSetVar( $this->mTimestamp, $x );
        }

        /**
         * Note that setting or changing this does not *make* the page a redirect
         * or change its target, it merely records the information for reference
         * during the parse.
         *
         * @since 1.24
         * @param Title|null $title
         */
        public function setRedirectTarget( $title ) {
                $this->redirectTarget = $title;
        }

        /**
         * Get the previously-set redirect target.
         *
         * @since 1.24
         * @return Title|null
         */
        public function getRedirectTarget() {
                return $this->redirectTarget;
        }

        /**
         * Extra key that should be present in the parser cache key.
         * @warning Consider registering your additional options with the
         *  ParserOptionsRegister hook instead of using this method.
         * @param string $key
         */
        public function addExtraKey( $key ) {
                $this->mExtraKey .= '!' . $key;
        }

        /**
         * Get the identity of the user for whom the parse is made.
         * @since 1.36
         * @return UserIdentity
         */
        public function getUserIdentity(): UserIdentity {
                return $this->mUser;
        }

        /**
         * @param UserIdentity $user
         * @param Language|null $lang
         */
        public function __construct( UserIdentity $user, $lang = null ) {
                if ( $lang === null ) {
                        global $wgLang;
                        StubObject::unstub( $wgLang );
                        $lang = $wgLang;
                }
                $this->initialiseFromUser( $user, $lang );
        }

        /**
         * Get a ParserOptions object for an anonymous user
         * @since 1.27
         * @return ParserOptions
         */
        public static function newFromAnon() {
                return new ParserOptions( MediaWikiServices::getInstance()->getUserFactory()->newAnonymous(),
                        MediaWikiServices::getInstance()->getContentLanguage() );
        }

        /**
         * Get a ParserOptions object from a given user.
         * Language will be taken from $wgLang.
         *
         * @param UserIdentity $user
         * @return ParserOptions
         */
        public static function newFromUser( $user ) {
                return new ParserOptions( $user );
        }

        /**
         * Get a ParserOptions object from a given user and language
         *
         * @param UserIdentity $user
         * @param Language $lang
         * @return ParserOptions
         */
        public static function newFromUserAndLang( UserIdentity $user, Language $lang ) {
                return new ParserOptions( $user, $lang );
        }

        /**
         * Get a ParserOptions object from a IContextSource object
         *
         * @param IContextSource $context
         * @return ParserOptions
         */
        public static function newFromContext( IContextSource $context ) {
                $contextUser = $context->getUser();

                // Use the stashed temporary account name instead of an IP address as the user for the ParserOptions
                // (if a stashed name is set). This is so that magic words like {{REVISIONUSER}} show the temporary account
                // name instead of IP address.
                $tempUserCreator = MediaWikiServices::getInstance()->getTempUserCreator();
                if ( $tempUserCreator->isEnabled() && IPUtils::isIPAddress( $contextUser->getName() ) ) {
                        // We do not attempt to acquire a temporary account name if no name is stashed, as this may be called in
                        // contexts (such as the parse API) where the user will not be performing an edit on their next action
                        // and therefore would be increasing the rate limit unnecessarily.
                        $tempName = $tempUserCreator->getStashedName( $context->getRequest()->getSession() );
                        if ( $tempName !== null ) {
                                $contextUser = UserIdentityValue::newAnonymous( $tempName );
                        }
                }

                return new ParserOptions( $contextUser, $context->getLanguage() );
        }

        /**
         * Creates a "canonical" ParserOptions object
         *
         * For historical reasons, certain options have default values that are
         * different from the canonical values used for caching.
         *
         * @since 1.30
         * @since 1.32 Added string and IContextSource as options for the first parameter
         * @since 1.36 UserIdentity is also allowed
         * @deprecated since 1.38. Use ::newFromContext, ::newFromAnon or ::newFromUserAndLang instead.
         *   Canonical ParserOptions are now exactly the same as non-canonical.
         * @param IContextSource|string|UserIdentity $context
         *  - If an IContextSource, the options are initialized based on the source's UserIdentity and Language.
         *  - If the string 'canonical', the options are initialized with an anonymous user and
         *    the content language.
         *  - If a UserIdentity, the options are initialized for that UserIdentity
         *    'userlang' is taken from the $userLang parameter, defaulting to $wgLang if that is null.
         * @param Language|StubObject|null $userLang (see above)
         * @return ParserOptions
         */
        public static function newCanonical( $context, $userLang = null ) {
                if ( $context instanceof IContextSource ) {
                        $ret = self::newFromContext( $context );
                } elseif ( $context === 'canonical' ) {
                        $ret = self::newFromAnon();
                } elseif ( $context instanceof UserIdentity ) {
                        $ret = new self( $context, $userLang );
                } else {
                        throw new InvalidArgumentException(
                                '$context must be an IContextSource, the string "canonical", or a UserIdentity'
                        );
                }
                return $ret;
        }

        /**
         * Reset static caches
         * @internal For testing
         */
        public static function clearStaticCache() {
                if ( !defined( 'MW_PHPUNIT_TEST' ) && !defined( 'MW_PARSER_TEST' ) ) {
                        throw new LogicException( __METHOD__ . ' is just for testing' );
                }
                self::$defaults = null;
                self::$lazyOptions = null;
                self::$cacheVaryingOptionsHash = null;
        }

        /**
         * Get default option values
         * @warning If you change the default for an existing option, all existing
         *  parser cache entries will be invalid. To avoid bugs, you'll need to handle
         *  that somehow (e.g. with the RejectParserCacheValue hook) because
         *  MediaWiki won't do it for you.
         * @return array
         */
        private static function getDefaults() {
                $services = MediaWikiServices::getInstance();
                $mainConfig = $services->getMainConfig();
                $interwikiMagic = $mainConfig->get( MainConfigNames::InterwikiMagic );
                $allowExternalImages = $mainConfig->get( MainConfigNames::AllowExternalImages );
                $allowExternalImagesFrom = $mainConfig->get( MainConfigNames::AllowExternalImagesFrom );
                $enableImageWhitelist = $mainConfig->get( MainConfigNames::EnableImageWhitelist );
                $allowSpecialInclusion = $mainConfig->get( MainConfigNames::AllowSpecialInclusion );
                $maxArticleSize = $mainConfig->get( MainConfigNames::MaxArticleSize );
                $maxPPNodeCount = $mainConfig->get( MainConfigNames::MaxPPNodeCount );
                $maxTemplateDepth = $mainConfig->get( MainConfigNames::MaxTemplateDepth );
                $maxPPExpandDepth = $mainConfig->get( MainConfigNames::MaxPPExpandDepth );
                $cleanSignatures = $mainConfig->get( MainConfigNames::CleanSignatures );
                $externalLinkTarget = $mainConfig->get( MainConfigNames::ExternalLinkTarget );
                $expensiveParserFunctionLimit = $mainConfig->get( MainConfigNames::ExpensiveParserFunctionLimit );
                $enableMagicLinks = $mainConfig->get( MainConfigNames::EnableMagicLinks );
                $languageConverterFactory = $services->getLanguageConverterFactory();
                $userOptionsLookup = $services->getUserOptionsLookup();
                $contentLanguage = $services->getContentLanguage();

                if ( self::$defaults === null ) {
                        // *UPDATE* ParserOptions::matches() if any of this changes as needed
                        self::$defaults = [
                                'dateformat' => null,
                                'interfaceMessage' => false,
                                'targetLanguage' => null,
                                'removeComments' => true,
                                'suppressTOC' => false,
                                'suppressSectionEditLinks' => false,
                                'collapsibleSections' => false,
                                'enableLimitReport' => false,
                                'preSaveTransform' => true,
                                'isPreview' => false,
                                'isSectionPreview' => false,
                                'printable' => false,
                                'allowUnsafeRawHtml' => true,
                                'wrapclass' => 'mw-parser-output',
                                'currentRevisionRecordCallback' => [ Parser::class, 'statelessFetchRevisionRecord' ],
                                'templateCallback' => [ Parser::class, 'statelessFetchTemplate' ],
                                'speculativeRevIdCallback' => null,
                                'speculativeRevId' => null,
                                'speculativePageIdCallback' => null,
                                'speculativePageId' => null,
                                'useParsoid' => false,
                        ];

                        self::$cacheVaryingOptionsHash = self::$initialCacheVaryingOptionsHash;
                        self::$lazyOptions = self::$initialLazyOptions;

                        ( new HookRunner( $services->getHookContainer() ) )->onParserOptionsRegister(
                                self::$defaults,
                                self::$cacheVaryingOptionsHash,
                                self::$lazyOptions
                        );

                        ksort( self::$cacheVaryingOptionsHash );
                }

                // Unit tests depend on being able to modify the globals at will
                return self::$defaults + [
                        'interwikiMagic' => $interwikiMagic,
                        'allowExternalImages' => $allowExternalImages,
                        'allowExternalImagesFrom' => $allowExternalImagesFrom,
                        'enableImageWhitelist' => $enableImageWhitelist,
                        'allowSpecialInclusion' => $allowSpecialInclusion,
                        'maxIncludeSize' => $maxArticleSize * 1024,
                        'maxPPNodeCount' => $maxPPNodeCount,
                        'maxPPExpandDepth' => $maxPPExpandDepth,
                        'maxTemplateDepth' => $maxTemplateDepth,
                        'expensiveParserFunctionLimit' => $expensiveParserFunctionLimit,
                        'externalLinkTarget' => $externalLinkTarget,
                        'cleanSignatures' => $cleanSignatures,
                        'disableContentConversion' => $languageConverterFactory->isConversionDisabled(),
                        'disableTitleConversion' => $languageConverterFactory->isLinkConversionDisabled(),
                        // FIXME: The fallback to false for enableMagicLinks is a band-aid to allow
                        // the phpunit entrypoint patch (I82045c207738d152d5b0006f353637cfaa40bb66)
                        // to be merged.
                        // It is possible that a test somewhere is globally resetting $wgEnableMagicLinks
                        // to null, or that ParserOptions is somehow similarly getting reset in such a way
                        // that $enableMagicLinks ends up as null rather than an array. This workaround
                        // seems harmless, but would be nice to eventually fix the underlying issue.
                        'magicISBNLinks' => $enableMagicLinks['ISBN'] ?? false,
                        'magicPMIDLinks' => $enableMagicLinks['PMID'] ?? false,
                        'magicRFCLinks' => $enableMagicLinks['RFC'] ?? false,
                        'thumbsize' => $userOptionsLookup->getDefaultOption( 'thumbsize' ),
                        'userlang' => $contentLanguage,
                ];
        }

        /**
         * Get user options
         *
         * @param UserIdentity $user
         * @param Language $lang
         */
        private function initialiseFromUser( UserIdentity $user, Language $lang ) {
                // Initially lazy loaded option defaults must not be taken into account,
                // otherwise lazy loading does not work. Setting a default for lazy option
                // is useful for matching with canonical options.
                $this->options = $this->nullifyLazyOption( self::getDefaults() );

                $this->mUser = $user;
                $services = MediaWikiServices::getInstance();
                $optionsLookup = $services->getUserOptionsLookup();
                $this->options['thumbsize'] = $optionsLookup->getOption( $user, 'thumbsize' );
                $this->options['userlang'] = $lang;
        }

        /**
         * Check if these options match that of another options set
         *
         * This ignores report limit settings that only affect HTML comments
         *
         * @param ParserOptions $other
         * @return bool
         * @since 1.25
         */
        public function matches( ParserOptions $other ) {
                // Compare most options
                $options = array_keys( $this->options );
                $options = array_diff( $options, [
                        'enableLimitReport', // only affects HTML comments
                        'tidy', // Has no effect since 1.35; removed in 1.36
                ] );
                foreach ( $options as $option ) {
                        // Resolve any lazy options
                        $this->lazyLoadOption( $option );
                        $other->lazyLoadOption( $option );

                        $o1 = $this->optionToString( $this->options[$option] );
                        $o2 = $this->optionToString( $other->options[$option] );
                        if ( $o1 !== $o2 ) {
                                return false;
                        }
                }

                // Compare most other fields
                foreach ( ( new ReflectionClass( $this ) )->getProperties() as $property ) {
                        $field = $property->getName();
                        if ( $property->isStatic() ) {
                                continue;
                        }
                        if ( in_array( $field, [
                                'options', // Already checked above
                                'onAccessCallback', // only used for ParserOutput option tracking
                        ] ) ) {
                                continue;
                        }

                        if ( !is_object( $this->$field ) && $this->$field !== $other->$field ) {
                                return false;
                        }
                }

                return true;
        }

        /**
         * @param ParserOptions $other
         * @return bool Whether the cache key relevant options match those of $other
         * @since 1.33
         */
        public function matchesForCacheKey( ParserOptions $other ) {
                foreach ( self::allCacheVaryingOptions() as $option ) {
                        // Populate any lazy options
                        $this->lazyLoadOption( $option );
                        $other->lazyLoadOption( $option );

                        $o1 = $this->optionToString( $this->options[$option] );
                        $o2 = $this->optionToString( $other->options[$option] );
                        if ( $o1 !== $o2 ) {
                                return false;
                        }
                }

                return true;
        }

        /**
         * Registers a callback for tracking which ParserOptions which are used.
         *
         * @since 1.16
         * @param callable|null $callback
         */
        public function registerWatcher( $callback ) {
                $this->onAccessCallback = $callback;
        }

        /**
         * Record that an option was internally accessed.
         *
         * This calls the watcher set by ParserOptions::registerWatcher().
         * Typically, the watcher callback is ParserOutput::recordOption().
         * The information registered this way is consumed by ParserCache::save().
         *
         * @param string $optionName Name of the option
         */
        private function optionUsed( $optionName ) {
                if ( $this->onAccessCallback ) {
                        call_user_func( $this->onAccessCallback, $optionName );
                }
        }

        /**
         * Return all option keys that vary the options hash
         * @since 1.30
         * @return string[]
         */
        public static function allCacheVaryingOptions() {
                return array_keys( array_filter( self::getCacheVaryingOptionsHash() ) );
        }

        /**
         * Convert an option to a string value
         * @param mixed $value
         * @return string
         */
        private function optionToString( $value ) {
                if ( $value === true ) {
                        return '1';
                } elseif ( $value === false ) {
                        return '0';
                } elseif ( $value === null ) {
                        return '';
                } elseif ( $value instanceof Language ) {
                        return $value->getCode();
                } elseif ( is_array( $value ) ) {
                        return '[' . implode( ',', array_map( [ $this, 'optionToString' ], $value ) ) . ']';
                } else {
                        return (string)$value;
                }
        }

        /**
         * Generate a hash string with the values set on these ParserOptions
         * for the keys given in the array.
         * This will be used as part of the hash key for the parser cache,
         * so users sharing the options with vary for the same page share
         * the same cached data safely.
         *
         * @since 1.17
         * @param string[] $forOptions
         * @param Title|null $title Used to get the content language of the page (since r97636)
         * @return string Page rendering hash
         */
        public function optionsHash( $forOptions, $title = null ) {
                $renderHashAppend = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::RenderHashAppend );

                $inCacheKey = self::allCacheVaryingOptions();

                // Resolve any lazy options
                $lazyOpts = array_intersect( $forOptions,
                        $inCacheKey, array_keys( self::getLazyOptions() ) );
                foreach ( $lazyOpts as $k ) {
                        $this->lazyLoadOption( $k );
                }

                $options = $this->options;
                $defaults = self::getDefaults();

                // We only include used options with non-canonical values in the key
                // so adding a new option doesn't invalidate the entire parser cache.
                // The drawback to this is that changing the default value of an option
                // requires manual invalidation of existing cache entries, as mentioned
                // in the docs on the relevant methods and hooks.
                $values = [];
                foreach ( array_intersect( $inCacheKey, $forOptions ) as $option ) {
                        $v = $this->optionToString( $options[$option] );
                        $d = $this->optionToString( $defaults[$option] );
                        if ( $v !== $d ) {
                                $values[] = "$option=$v";
                        }
                }

                $confstr = $values ? implode( '!', $values ) : 'canonical';

                // add in language specific options, if any
                // @todo FIXME: This is just a way of retrieving the url/user preferred variant
                $services = MediaWikiServices::getInstance();
                $lang = $title ? $title->getPageLanguage() : $services->getContentLanguage();
                $converter = $services->getLanguageConverterFactory()->getLanguageConverter( $lang );
                $confstr .= $converter->getExtraHashOptions();

                $confstr .= $renderHashAppend;

                if ( $this->mExtraKey != '' ) {
                        $confstr .= $this->mExtraKey;
                }

                $user = $services->getUserFactory()->newFromUserIdentity( $this->getUserIdentity() );
                // Give a chance for extensions to modify the hash, if they have
                // extra options or other effects on the parser cache.
                ( new HookRunner( $services->getHookContainer() ) )->onPageRenderingHash(
                        $confstr,
                        $user,
                        $forOptions
                );

                // Make it a valid memcached key fragment
                $confstr = str_replace( ' ', '_', $confstr );

                return $confstr;
        }

        /**
         * Test whether these options are safe to cache
         * @param string[]|null $usedOptions the list of options actually used in the parse. Defaults to all options.
         * @return bool
         * @since 1.30
         */
        public function isSafeToCache( ?array $usedOptions = null ) {
                $defaults = self::getDefaults();
                $inCacheKey = self::getCacheVaryingOptionsHash();
                $usedOptions ??= array_keys( $this->options );
                foreach ( $usedOptions as $option ) {
                        if ( empty( $inCacheKey[$option] ) && empty( self::$callbacks[$option] ) ) {
                                $v = $this->optionToString( $this->options[$option] ?? null );
                                $d = $this->optionToString( $defaults[$option] ?? null );
                                if ( $v !== $d ) {
                                        return false;
                                }
                        }
                }
                return true;
        }

        /**
         * Sets a hook to force that a page exists, and sets a current revision callback to return
         * a revision with custom content when the current revision of the page is requested.
         *
         * @param PageIdentity $page
         * @param Content $content
         * @param UserIdentity $user The user that the fake revision is attributed to
         * @param int $currentRevId
         *
         * @return ScopedCallback to unset the hook
         * @internal since 1.44, this method is no longer considered safe to call
         * by extensions. It may be removed or changed in a backwards incompatible
         * way in 1.45 or later.
         *
         * @since 1.25
         */
        public function setupFakeRevision( $page, $content, $user, $currentRevId = 0 ) {
                $oldCallback = $this->setCurrentRevisionRecordCallback(
                        function ( $titleToCheck, $parser = null )
                        use ( $page, $content, $user, $currentRevId, &$oldCallback )
                        {
                                if ( $titleToCheck->isSamePageAs( $page ) ) {
                                        if ( $page->exists() ) {
                                                $pageId = $page->getId();

                                                if ( $currentRevId ) {
                                                        $parentRevision = $currentRevId;
                                                } elseif ( $page instanceof Title ) {
                                                        $parentRevision = $page->getLatestRevID();
                                                } elseif ( $page instanceof PageRecord ) {
                                                        $parentRevision = $page->getLatest();
                                                } else {
                                                        $parentRevision = 0;
                                                }
                                        } else {
                                                $pageId = $this->getSpeculativePageId() ?: 0;
                                                $parentRevision = 0;
                                                $page = new PageIdentityValue(
                                                        $pageId,
                                                        $page->getNamespace(),
                                                        $page->getDBkey(),
                                                        $page->getWikiId()
                                                );
                                        }

                                        $revRecord = new MutableRevisionRecord( $page );
                                        $revRecord->setContent( SlotRecord::MAIN, $content )
                                                ->setUser( $user )
                                                ->setTimestamp( MWTimestamp::now( TS_MW ) )
                                                ->setId( 0 )
                                                ->setPageId( $pageId )
                                                ->setParentId( $parentRevision );
                                        return $revRecord;
                                } else {
                                        return call_user_func( $oldCallback, $titleToCheck, $parser );
                                }
                        }
                );

                $hookContainer = MediaWikiServices::getInstance()->getHookContainer();
                $hookScope = $hookContainer->scopedRegister(
                        'TitleExists',
                        static function ( Title $titleToCheck, &$exists ) use ( $page ) {
                                if ( $titleToCheck->isSamePageAs( $page ) ) {
                                        $exists = true;
                                }
                        }
                );

                $linkCache = MediaWikiServices::getInstance()->getLinkCache();
                $linkCache->clearBadLink( $page );

                return new ScopedCallback( function () use ( $page, $hookScope, $linkCache, $oldCallback ) {
                        ScopedCallback::consume( $hookScope );
                        $linkCache->clearLink( $page );
                        $this->setCurrentRevisionRecordCallback( $oldCallback );
                } );
        }

        /**
         * Returns reason for rendering the content. This human-readable, intended for logging and debugging only.
         * Expected values include "edit", "view", "purge", "LinksUpdate", etc.
         * @return string
         */
        public function getRenderReason(): string {
                return $this->renderReason;
        }

        /**
         * Sets reason for rendering the content. This human-readable, intended for logging and debugging only.
         * Expected values include "edit", "view", "purge", "LinksUpdate", etc.
         * @param string $renderReason
         */
        public function setRenderReason( string $renderReason ): void {
                $this->renderReason = $renderReason;
        }
}

/** @deprecated class alias since 1.43 */
class_alias( ParserOptions::class, 'ParserOptions' );

/**
 * For really cool vim folding this needs to be at the end:
 * vim: foldmarker=@{,@} foldmethod=marker
 */