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<?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
*/
/**
* This is a utility class with only static functions
* 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.
*
* These are synonyms for the names given in the language file
* Users and translators should not change them
*
*/
class MWNamespace {
/**
* 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 static $alwaysCapitalizedNamespaces = array( NS_SPECIAL, NS_USER, NS_MEDIAWIKI );
/**
* 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 $index
* @param $method
*
* @throws MWException
* @return bool
*/
private static function isMethodValidFor( $index, $method ) {
if ( $index < NS_MAIN ) {
throw new MWException( "$method does not make any sense for given namespace $index" );
}
return true;
}
/**
* Can pages in the given namespace be moved?
*
* @param int $index namespace index
* @return bool
*/
public static function isMovable( $index ) {
global $wgAllowImageMoving;
$result = !( $index < NS_MAIN || ( $index == NS_FILE && !$wgAllowImageMoving ) || $index == NS_CATEGORY );
/**
* @since 1.20
*/
wfRunHooks( 'NamespaceIsMovable', array( $index, &$result ) );
return $result;
}
/**
* Is the given namespace is a subject (non-talk) namespace?
*
* @param int $index namespace index
* @return bool
* @since 1.19
*/
public static function isSubject( $index ) {
return !self::isTalk( $index );
}
/**
* @see self::isSubject
* @deprecated Please use the more consistently named isSubject (since 1.19)
* @return bool
*/
public static function isMain( $index ) {
wfDeprecated( __METHOD__, '1.19' );
return self::isSubject( $index );
}
/**
* Is the given namespace a talk namespace?
*
* @param int $index namespace index
* @return bool
*/
public static function isTalk( $index ) {
return $index > NS_MAIN
&& $index % 2;
}
/**
* Get the talk namespace index for a given namespace
*
* @param int $index namespace index
* @return int
*/
public static function getTalk( $index ) {
self::isMethodValidFor( $index, __METHOD__ );
return self::isTalk( $index )
? $index
: $index + 1;
}
/**
* 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 static function getSubject( $index ) {
# Handle special namespaces
if ( $index < NS_MAIN ) {
return $index;
}
return self::isTalk( $index )
? $index - 1
: $index;
}
/**
* 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 or null if no associated namespace could be found
*/
public static function getAssociated( $index ) {
self::isMethodValidFor( $index, __METHOD__ );
if ( self::isSubject( $index ) ) {
return self::getTalk( $index );
} elseif ( self::isTalk( $index ) ) {
return self::getSubject( $index );
} else {
return null;
}
}
/**
* Returns whether the specified namespace exists
*
* @param $index
*
* @return bool
* @since 1.19
*/
public static function exists( $index ) {
$nslist = self::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
* @since 1.19
*/
public static 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
* @since 1.19
*/
public static function subjectEquals( $ns1, $ns2 ) {
return self::getSubject( $ns1 ) == self::getSubject( $ns2 );
}
/**
* Returns array of all defined namespaces with their canonical
* (English) names.
*
* @param bool $rebuild rebuild namespace list (default = false). Used for testing.
*
* @return array
* @since 1.17
*/
public static function getCanonicalNamespaces( $rebuild = false ) {
static $namespaces = null;
if ( $namespaces === null || $rebuild ) {
global $wgExtraNamespaces, $wgCanonicalNamespaceNames;
$namespaces = array( NS_MAIN => '' ) + $wgCanonicalNamespaceNames;
if ( is_array( $wgExtraNamespaces ) ) {
$namespaces += $wgExtraNamespaces;
}
wfRunHooks( 'CanonicalNamespaces', array( &$namespaces ) );
}
return $namespaces;
}
/**
* Returns the canonical (English) name for a given index
*
* @param int $index namespace index
* @return string or false if no canonical definition.
*/
public static function getCanonicalName( $index ) {
$nslist = self::getCanonicalNamespaces();
if ( isset( $nslist[$index] ) ) {
return $nslist[$index];
} else {
return 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
*/
public static function getCanonicalIndex( $name ) {
static $xNamespaces = false;
if ( $xNamespaces === false ) {
$xNamespaces = array();
foreach ( self::getCanonicalNamespaces() as $i => $text ) {
$xNamespaces[strtolower( $text )] = $i;
}
}
if ( array_key_exists( $name, $xNamespaces ) ) {
return $xNamespaces[$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.
* @return array
*/
public static function getValidNamespaces() {
static $mValidNamespaces = null;
if ( is_null( $mValidNamespaces ) ) {
foreach ( array_keys( self::getCanonicalNamespaces() ) as $ns ) {
if ( $ns >= 0 ) {
$mValidNamespaces[] = $ns;
}
}
}
return $mValidNamespaces;
}
/**
* Can this namespace ever have a talk namespace?
*
* @param int $index namespace index
* @return bool
*/
public static function canTalk( $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 static function isContent( $index ) {
global $wgContentNamespaces;
return $index == NS_MAIN || in_array( $index, $wgContentNamespaces );
}
/**
* Can pages in a namespace be watched?
*
* @param $index Int
* @return bool
*/
public static function isWatchable( $index ) {
return $index >= NS_MAIN;
}
/**
* Does the namespace allow subpages?
*
* @param int $index Index to check
* @return bool
*/
public static function hasSubpages( $index ) {
global $wgNamespacesWithSubpages;
return !empty( $wgNamespacesWithSubpages[$index] );
}
/**
* Get a list of all namespace indices which are considered to contain content
* @return array of namespace indices
*/
public static function getContentNamespaces() {
global $wgContentNamespaces;
if ( !is_array( $wgContentNamespaces ) || $wgContentNamespaces === array() ) {
return NS_MAIN;
} elseif ( !in_array( NS_MAIN, $wgContentNamespaces ) ) {
// always force NS_MAIN to be part of array (to match the algorithm used by isContent)
return array_merge( array( NS_MAIN ), $wgContentNamespaces );
} else {
return $wgContentNamespaces;
}
}
/**
* List all namespace indices which are considered subject, aka not a talk
* or special namespace. See also MWNamespace::isSubject
*
* @return array of namespace indices
*/
public static function getSubjectNamespaces() {
return array_filter(
MWNamespace::getValidNamespaces(),
'MWNamespace::isSubject'
);
}
/**
* List all namespace indices which are considered talks, aka not a subject
* or special namespace. See also MWNamespace::isTalk
*
* @return array of namespace indices
*/
public static function getTalkNamespaces() {
return array_filter(
MWNamespace::getValidNamespaces(),
'MWNamespace::isTalk'
);
}
/**
* Is the namespace first-letter capitalized?
*
* @param int $index Index to check
* @return bool
*/
public static function isCapitalized( $index ) {
global $wgCapitalLinks, $wgCapitalLinkOverrides;
// Turn NS_MEDIA into NS_FILE
$index = $index === NS_MEDIA ? NS_FILE : $index;
// Make sure to get the subject of our namespace
$index = self::getSubject( $index );
// Some namespaces are special and should always be upper case
if ( in_array( $index, self::$alwaysCapitalizedNamespaces ) ) {
return true;
}
if ( isset( $wgCapitalLinkOverrides[ $index ] ) ) {
// $wgCapitalLinkOverrides is explicitly set
return $wgCapitalLinkOverrides[ $index ];
}
// Default to the global setting
return $wgCapitalLinks;
}
/**
* Does the namespace (potentially) have different aliases for different
* genders. Not all languages make a distinction here.
*
* @since 1.18
* @param int $index Index to check
* @return bool
*/
public static function hasGenderDistinction( $index ) {
return $index == NS_USER || $index == NS_USER_TALK;
}
/**
* It is not possible to use pages from this namespace as template?
*
* @since 1.20
* @param int $index Index to check
* @return bool
*/
public static function isNonincludable( $index ) {
global $wgNonincludableNamespaces;
return $wgNonincludableNamespaces && in_array( $index, $wgNonincludableNamespaces );
}
/**
* Get the default content model for a namespace
* This does not mean that all pages in that namespace have the model
*
* @since 1.21
* @param int $index Index to check
* @return null|string default model name for the given namespace, if set
*/
public static function getNamespaceContentModel( $index ) {
global $wgNamespaceContentModels;
return isset( $wgNamespaceContentModels[$index] )
? $wgNamespaceContentModels[$index]
: null;
}
}