1 files changed, 129 insertions, 0 deletions
diff --git a/includes/Namespace.php b/includes/Namespace.php
new file mode 100644
index 00000000..ab7511d0
--- /dev/null
+++ b/includes/Namespace.php
@@ -0,0 +1,129 @@
+<?php
+/**
+ * Provide things related to namespaces
+ * @package MediaWiki
+ */
+
+/**
+ * Definitions of the NS_ constants are in Defines.php
+ * @private
+ */
+$wgCanonicalNamespaceNames = array(
+	NS_MEDIA            => 'Media',
+	NS_SPECIAL          => 'Special',
+	NS_TALK	            => 'Talk',
+	NS_USER             => 'User',
+	NS_USER_TALK        => 'User_talk',
+	NS_PROJECT          => 'Project',
+	NS_PROJECT_TALK     => 'Project_talk',
+	NS_IMAGE            => 'Image',
+	NS_IMAGE_TALK       => 'Image_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',
+);
+
+if( is_array( $wgExtraNamespaces ) ) {
+	$wgCanonicalNamespaceNames = $wgCanonicalNamespaceNames + $wgExtraNamespaces;
+}
+
+/**
+ * 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
+ *
+ * @package MediaWiki
+ */
+class Namespace {
+
+	/**
+	 * Check if the given namespace might be moved
+	 * @return bool
+	 */
+	function isMovable( $index ) {
+		return !( $index < NS_MAIN || $index == NS_IMAGE  || $index == NS_CATEGORY );
+	}
+
+	/**
+	 * Check if the given namespace is not a talk page
+	 * @return bool
+	 */
+	function isMain( $index ) {
+		return ! Namespace::isTalk( $index );
+	}
+
+	/**
+	 * Check if the give namespace is a talk page
+	 * @return bool
+	 */
+	function isTalk( $index ) {
+		return ($index > NS_MAIN)  // Special namespaces are negative
+			&& ($index % 2); // Talk namespaces are odd-numbered
+	}
+
+	/**
+	 * Get the talk namespace corresponding to the given index
+	 */
+	function getTalk( $index ) {
+		if ( Namespace::isTalk( $index ) ) {
+			return $index;
+		} else {
+			# FIXME
+			return $index + 1;
+		}
+	}
+
+	function getSubject( $index ) {
+		if ( Namespace::isTalk( $index ) ) {
+			return $index - 1;
+		} else {
+			return $index;
+		}
+	}
+
+	/**
+	 * Returns the canonical (English Wikipedia) name for a given index
+	 */
+	function getCanonicalName( $index ) {
+		global $wgCanonicalNamespaceNames;
+		return $wgCanonicalNamespaceNames[$index];
+	}
+
+	/**
+	 * Returns the index for a given canonical name, or NULL
+	 * The input *must* be converted to lower case first
+	 */
+	function getCanonicalIndex( $name ) {
+		global $wgCanonicalNamespaceNames;
+		static $xNamespaces = false;
+		if ( $xNamespaces === false ) {
+			$xNamespaces = array();
+			foreach ( $wgCanonicalNamespaceNames as $i => $text ) {
+				$xNamespaces[strtolower($text)] = $i;
+			}
+		}
+		if ( array_key_exists( $name, $xNamespaces ) ) {
+			return $xNamespaces[$name];
+		} else {
+			return NULL;
+		}
+	}
+	
+	/**
+	 * Can this namespace ever have a talk namespace?
+	 * @param $index Namespace index
+	 */
+	 function canTalk( $index ) {
+	 	return( $index >= NS_MAIN );
+	 }
+}
+?>