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[mediawiki.git] / includes / title / NamespaceInfo.php

<?php
/**
 * Provide things related to namespaces.
 *
 * 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
 */

namespace MediaWiki\Title;

use InvalidArgumentException;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\HookContainer\HookContainer;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\MainConfigNames;
use MWException;

/**
 * This is a utility class for dealing with namespaces that encodes all the "magic" behaviors of
 * them based on index.  The textual names of the namespaces are handled by Language.php.
 *
 * @since 1.34
 */
class NamespaceInfo {

        /**
         * These namespaces should always be first-letter capitalized, now and
         * forevermore. Historically, they could've probably been lowercased too,
         * but some things are just too ingrained now. :)
         */
        private const ALWAYS_CAPITALIZED_NAMESPACES = [ NS_SPECIAL, NS_USER, NS_MEDIAWIKI ];

        /** @var string[]|null Canonical namespaces cache */
        private $canonicalNamespaces = null;

        /** @var array|false Canonical namespaces index cache */
        private $namespaceIndexes = false;

        /** @var int[]|null Valid namespaces cache */
        private $validNamespaces = null;

        private ServiceOptions $options;
        private HookRunner $hookRunner;
        private array $extensionNamespaces;
        private array $extensionImmovableNamespaces;

        /**
         * Definitions of the NS_ constants are in Defines.php
         *
         * @internal
         */
        public const CANONICAL_NAMES = [
                NS_MEDIA            => 'Media',
                NS_SPECIAL          => 'Special',
                NS_MAIN             => '',
                NS_TALK             => 'Talk',
                NS_USER             => 'User',
                NS_USER_TALK        => 'User_talk',
                NS_PROJECT          => 'Project',
                NS_PROJECT_TALK     => 'Project_talk',
                NS_FILE             => 'File',
                NS_FILE_TALK        => 'File_talk',
                NS_MEDIAWIKI        => 'MediaWiki',
                NS_MEDIAWIKI_TALK   => 'MediaWiki_talk',
                NS_TEMPLATE         => 'Template',
                NS_TEMPLATE_TALK    => 'Template_talk',
                NS_HELP             => 'Help',
                NS_HELP_TALK        => 'Help_talk',
                NS_CATEGORY         => 'Category',
                NS_CATEGORY_TALK    => 'Category_talk',
        ];

        /**
         * @internal For use by ServiceWiring
         */
        public const CONSTRUCTOR_OPTIONS = [
                MainConfigNames::CanonicalNamespaceNames,
                MainConfigNames::CapitalLinkOverrides,
                MainConfigNames::CapitalLinks,
                MainConfigNames::ContentNamespaces,
                MainConfigNames::ExtraNamespaces,
                MainConfigNames::ExtraSignatureNamespaces,
                MainConfigNames::NamespaceContentModels,
                MainConfigNames::NamespacesWithSubpages,
                MainConfigNames::NonincludableNamespaces,
        ];

        public function __construct(
                ServiceOptions $options,
                HookContainer $hookContainer,
                array $extensionNamespaces,
                array $extensionImmovableNamespaces
        ) {
                $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
                $this->options = $options;
                $this->hookRunner = new HookRunner( $hookContainer );
                $this->extensionNamespaces = $extensionNamespaces;
                $this->extensionImmovableNamespaces = $extensionImmovableNamespaces;
        }

        /**
         * Throw an exception when trying to get the subject or talk page
         * for a given namespace where it does not make sense.
         * Special namespaces are defined in includes/Defines.php and have
         * a value below 0 (ex: NS_SPECIAL = -1 , NS_MEDIA = -2)
         *
         * @param int $index
         * @param string $method
         *
         * @throws MWException
         * @return bool
         */
        private function isMethodValidFor( $index, $method ) {
                if ( $index < NS_MAIN ) {
                        throw new MWException( "$method does not make any sense for given namespace $index" );
                }
                return true;
        }

        /**
         * Throw if given index isn't an integer or integer-like string and so can't be a valid namespace.
         *
         * @param int|string $index
         * @param string $method
         *
         * @throws InvalidArgumentException
         * @return int Cleaned up namespace index
         */
        private function makeValidNamespace( $index, $method ) {
                if ( !(
                        is_int( $index )
                        // Namespace index numbers as strings
                        || ctype_digit( $index )
                        // Negative numbers as strings
                        || ( $index[0] === '-' && ctype_digit( substr( $index, 1 ) ) )
                ) ) {
                        throw new InvalidArgumentException(
                                "$method called with non-integer (" . get_debug_type( $index ) . ") namespace '$index'"
                        );
                }

                return intval( $index );
        }

        /**
         * Can pages in the given namespace be moved?
         *
         * @param int $index Namespace index
         * @return bool
         */
        public function isMovable( $index ) {
                $result = $index >= NS_MAIN && !in_array( $index, $this->extensionImmovableNamespaces );

                /**
                 * @since 1.20
                 */
                $this->hookRunner->onNamespaceIsMovable( $index, $result );

                return $result;
        }

        /**
         * Is the given namespace is a subject (non-talk) namespace?
         *
         * @param int $index Namespace index
         * @return bool
         */
        public function isSubject( $index ) {
                return !$this->isTalk( $index );
        }

        /**
         * Is the given namespace a talk namespace?
         *
         * @param int $index Namespace index
         * @return bool
         */
        public function isTalk( $index ) {
                $index = $this->makeValidNamespace( $index, __METHOD__ );

                return $index > NS_MAIN
                        && $index % 2 === 1;
        }

        /**
         * Get the talk namespace index for a given namespace
         *
         * @param int $index Namespace index
         * @return int
         * @throws MWException if the given namespace doesn't have an associated talk namespace
         *         (e.g. NS_SPECIAL).
         */
        public function getTalk( $index ) {
                $index = $this->makeValidNamespace( $index, __METHOD__ );

                $this->isMethodValidFor( $index, __METHOD__ );
                return $this->isTalk( $index )
                        ? $index
                        : $index + 1;
        }

        /**
         * Get a LinkTarget referring to the talk page of $target.
         *
         * @see canHaveTalkPage
         * @param LinkTarget $target
         * @return LinkTarget Talk page for $target
         * @throws MWException if $target doesn't have talk pages, e.g. because it's in NS_SPECIAL,
         *         because it's a relative section-only link, or it's an interwiki link.
         */
        public function getTalkPage( LinkTarget $target ): LinkTarget {
                if ( $target->getText() === '' ) {
                        throw new MWException( 'Can\'t determine talk page associated with relative section link' );
                }

                if ( $target->getInterwiki() !== '' ) {
                        throw new MWException( 'Can\'t determine talk page associated with interwiki link' );
                }

                if ( $this->isTalk( $target->getNamespace() ) ) {
                        return $target;
                }

                // NOTE: getTalk throws on bad namespaces!
                return new TitleValue( $this->getTalk( $target->getNamespace() ), $target->getDBkey() );
        }

        /**
         * Can the title have a corresponding talk page?
         *
         * False for relative section-only links (with getText() === ''),
         * interwiki links (with getInterwiki() !== ''), and pages in NS_SPECIAL.
         *
         * @see getTalkPage
         *
         * @param LinkTarget $target
         * @return bool True if this title either is a talk page or can have a talk page associated.
         */
        public function canHaveTalkPage( LinkTarget $target ) {
                return $target->getNamespace() >= NS_MAIN &&
                        !$target->isExternal() &&
                        $target->getText() !== '';
        }

        /**
         * Get the subject namespace index for a given namespace
         * Special namespaces (NS_MEDIA, NS_SPECIAL) are always the subject.
         *
         * @param int $index Namespace index
         * @return int
         */
        public function getSubject( $index ) {
                $index = $this->makeValidNamespace( $index, __METHOD__ );

                # Handle special namespaces
                if ( $index < NS_MAIN ) {
                        return $index;
                }

                return $this->isTalk( $index )
                        ? $index - 1
                        : $index;
        }

        /**
         * @param LinkTarget $target
         * @return LinkTarget Subject page for $target
         */
        public function getSubjectPage( LinkTarget $target ): LinkTarget {
                if ( $this->isSubject( $target->getNamespace() ) ) {
                        return $target;
                }
                return new TitleValue( $this->getSubject( $target->getNamespace() ), $target->getDBkey() );
        }

        /**
         * Get the associated namespace.
         * For talk namespaces, returns the subject (non-talk) namespace
         * For subject (non-talk) namespaces, returns the talk namespace
         *
         * @param int $index Namespace index
         * @return int
         * @throws MWException if called on a namespace that has no talk pages (e.g., NS_SPECIAL)
         */
        public function getAssociated( $index ) {
                $this->isMethodValidFor( $index, __METHOD__ );

                if ( $this->isSubject( $index ) ) {
                        return $this->getTalk( $index );
                }
                return $this->getSubject( $index );
        }

        /**
         * @param LinkTarget $target
         * @return LinkTarget Talk page for $target if it's a subject page, subject page if it's a talk
         *   page
         * @throws MWException if $target's namespace doesn't have talk pages (e.g., NS_SPECIAL)
         */
        public function getAssociatedPage( LinkTarget $target ): LinkTarget {
                if ( $target->getText() === '' ) {
                        throw new MWException( 'Can\'t determine talk page associated with relative section link' );
                }

                if ( $target->getInterwiki() !== '' ) {
                        throw new MWException( 'Can\'t determine talk page associated with interwiki link' );
                }

                return new TitleValue(
                        $this->getAssociated( $target->getNamespace() ), $target->getDBkey() );
        }

        /**
         * Returns whether the specified namespace exists
         *
         * @param int $index
         *
         * @return bool
         */
        public function exists( $index ) {
                $nslist = $this->getCanonicalNamespaces();
                return isset( $nslist[$index] );
        }

        /**
         * Returns whether the specified namespaces are the same namespace
         *
         * @note It's possible that in the future we may start using something
         * other than just namespace indexes. Under that circumstance making use
         * of this function rather than directly doing comparison will make
         * sure that code will not potentially break.
         *
         * @param int $ns1 The first namespace index
         * @param int $ns2 The second namespace index
         *
         * @return bool
         */
        public function equals( $ns1, $ns2 ) {
                return $ns1 == $ns2;
        }

        /**
         * Returns whether the specified namespaces share the same subject.
         * eg: NS_USER and NS_USER wil return true, as well
         *     NS_USER and NS_USER_TALK will return true.
         *
         * @param int $ns1 The first namespace index
         * @param int $ns2 The second namespace index
         *
         * @return bool
         */
        public function subjectEquals( $ns1, $ns2 ) {
                return $this->getSubject( $ns1 ) == $this->getSubject( $ns2 );
        }

        /**
         * Returns array of all defined namespaces with their canonical
         * (English) names.
         *
         * @return string[]
         */
        public function getCanonicalNamespaces() {
                if ( $this->canonicalNamespaces === null ) {
                        $this->canonicalNamespaces =
                                [ NS_MAIN => '' ] + $this->options->get( MainConfigNames::CanonicalNamespaceNames );
                        $this->canonicalNamespaces += $this->extensionNamespaces;
                        if ( is_array( $this->options->get( MainConfigNames::ExtraNamespaces ) ) ) {
                                $this->canonicalNamespaces += $this->options->get( MainConfigNames::ExtraNamespaces );
                        }
                        $this->hookRunner->onCanonicalNamespaces( $this->canonicalNamespaces );
                }
                return $this->canonicalNamespaces;
        }

        /**
         * Returns the canonical (English) name for a given index
         *
         * @param int $index Namespace index
         * @return string|false If no canonical definition.
         */
        public function getCanonicalName( $index ) {
                $nslist = $this->getCanonicalNamespaces();
                return $nslist[$index] ?? false;
        }

        /**
         * Returns the index for a given canonical name, or NULL
         * The input *must* be converted to lower case first
         *
         * @param string $name Namespace name
         * @return int|null
         */
        public function getCanonicalIndex( $name ) {
                if ( $this->namespaceIndexes === false ) {
                        $this->namespaceIndexes = [];
                        foreach ( $this->getCanonicalNamespaces() as $i => $text ) {
                                $this->namespaceIndexes[strtolower( $text )] = $i;
                        }
                }
                if ( array_key_exists( $name, $this->namespaceIndexes ) ) {
                        return $this->namespaceIndexes[$name];
                } else {
                        return null;
                }
        }

        /**
         * Returns an array of the namespaces (by integer id) that exist on the wiki. Used primarily by
         * the API in help documentation. The array is sorted numerically and omits negative namespaces.
         * @return array
         */
        public function getValidNamespaces() {
                if ( $this->validNamespaces === null ) {
                        $this->validNamespaces = [];
                        foreach ( $this->getCanonicalNamespaces() as $ns => $_ ) {
                                if ( $ns >= 0 ) {
                                        $this->validNamespaces[] = $ns;
                                }
                        }
                        // T109137: sort numerically
                        sort( $this->validNamespaces, SORT_NUMERIC );
                }

                return $this->validNamespaces;
        }

        /**
         * Does this namespace ever have a talk namespace?
         *
         * @param int $index Namespace ID
         * @return bool True if this namespace either is or has a corresponding talk namespace.
         */
        public function hasTalkNamespace( $index ) {
                return $index >= NS_MAIN;
        }

        /**
         * Does this namespace contain content, for the purposes of calculating
         * statistics, etc?
         *
         * @param int $index Index to check
         * @return bool
         */
        public function isContent( $index ) {
                return $index == NS_MAIN ||
                        in_array( $index, $this->options->get( MainConfigNames::ContentNamespaces ) );
        }

        /**
         * Might pages in this namespace require the use of the Signature button on
         * the edit toolbar?
         *
         * @param int $index Index to check
         * @return bool
         */
        public function wantSignatures( $index ) {
                return $this->isTalk( $index ) ||
                        in_array( $index, $this->options->get( MainConfigNames::ExtraSignatureNamespaces ) );
        }

        /**
         * Can pages in a namespace be watched?
         *
         * @param int $index
         * @return bool
         */
        public function isWatchable( $index ) {
                return $index >= NS_MAIN;
        }

        /**
         * Does the namespace allow subpages? Note that this refers to structured
         * handling of subpages, and does not include SpecialPage subpage parameters.
         *
         * @param int $index Index to check
         * @return bool
         */
        public function hasSubpages( $index ) {
                return !empty( $this->options->get( MainConfigNames::NamespacesWithSubpages )[$index] );
        }

        /**
         * Get a list of all namespace indices which are considered to contain content
         * @return int[] Array of namespace indices
         */
        public function getContentNamespaces() {
                $contentNamespaces = $this->options->get( MainConfigNames::ContentNamespaces );
                if ( !is_array( $contentNamespaces ) || $contentNamespaces === [] ) {
                        return [ NS_MAIN ];
                } elseif ( !in_array( NS_MAIN, $contentNamespaces ) ) {
                        // always force NS_MAIN to be part of array (to match the algorithm used by isContent)
                        return array_merge( [ NS_MAIN ], $contentNamespaces );
                } else {
                        return $contentNamespaces;
                }
        }

        /**
         * List all namespace indices which are considered subject, aka not a talk
         * or special namespace. See also NamespaceInfo::isSubject
         *
         * @return int[] Array of namespace indices
         */
        public function getSubjectNamespaces() {
                return array_filter(
                        $this->getValidNamespaces(),
                        [ $this, 'isSubject' ]
                );
        }

        /**
         * List all namespace indices which are considered talks, aka not a subject
         * or special namespace. See also NamespaceInfo::isTalk
         *
         * @return int[] Array of namespace indices
         */
        public function getTalkNamespaces() {
                return array_filter(
                        $this->getValidNamespaces(),
                        [ $this, 'isTalk' ]
                );
        }

        /**
         * Is the namespace first-letter capitalized?
         *
         * @param int $index Index to check
         * @return bool
         */
        public function isCapitalized( $index ) {
                // Turn NS_MEDIA into NS_FILE
                $index = $index === NS_MEDIA ? NS_FILE : $index;

                // Make sure to get the subject of our namespace
                $index = $this->getSubject( $index );

                // Some namespaces are special and should always be upper case
                if ( in_array( $index, self::ALWAYS_CAPITALIZED_NAMESPACES ) ) {
                        return true;
                }
                $overrides = $this->options->get( MainConfigNames::CapitalLinkOverrides );
                if ( isset( $overrides[$index] ) ) {
                        // CapitalLinkOverrides is explicitly set
                        return $overrides[$index];
                }
                // Default to the global setting
                return $this->options->get( MainConfigNames::CapitalLinks );
        }

        /**
         * Does the namespace (potentially) have different aliases for different
         * genders. Not all languages make a distinction here.
         *
         * @param int $index Index to check
         * @return bool
         */
        public function hasGenderDistinction( $index ) {
                return $index == NS_USER || $index == NS_USER_TALK;
        }

        /**
         * It is not possible to use pages from this namespace as template?
         *
         * @param int $index Index to check
         * @return bool
         */
        public function isNonincludable( $index ) {
                $namespaces = $this->options->get( MainConfigNames::NonincludableNamespaces );
                return $namespaces && in_array( $index, $namespaces );
        }

        /**
         * Get the default content model for a namespace
         * This does not mean that all pages in that namespace have the model
         *
         * @note To determine the default model for a new page's main slot, or any slot in general,
         * use SlotRoleHandler::getDefaultModel() together with SlotRoleRegistry::getRoleHandler().
         *
         * @param int $index Index to check
         * @return null|string Default model name for the given namespace, if set
         */
        public function getNamespaceContentModel( $index ) {
                return $this->options->get( MainConfigNames::NamespaceContentModels )[$index] ?? null;
        }

        /**
         * Returns the link type to be used for categories.
         *
         * This determines which section of a category page titles
         * in the namespace will appear within.
         *
         * @param int $index Namespace index
         * @return string One of 'subcat', 'file', 'page'
         */
        public function getCategoryLinkType( $index ) {
                $this->isMethodValidFor( $index, __METHOD__ );

                if ( $index == NS_CATEGORY ) {
                        return 'subcat';
                } elseif ( $index == NS_FILE ) {
                        return 'file';
                } else {
                        return 'page';
                }
        }

        /**
         * Retrieve the indexes for the namespaces defined by core.
         *
         * @since 1.34
         *
         * @return int[]
         */
        public static function getCommonNamespaces() {
                return array_keys( self::CANONICAL_NAMES );
        }
}

/** @deprecated class alias since 1.41 */
class_alias( NamespaceInfo::class, 'NamespaceInfo' );