+
+ // Process initial colon
+ if ( title.charAt( 0 ) === ':' ) {
+ // Initial colon means main namespace instead of specified default
+ namespace = NS_MAIN;
+ title = title
+ // Strip colon
+ .substr( 1 )
+ // Trim underscores
+ .replace( rUnderscoreTrim, '' );
+ }
+
+ // Process namespace prefix (if any)
+ m = title.match( rSplit );
+ if ( m ) {
+ id = getNsIdByName( m[1] );
+ if ( id !== false ) {
+ // Ordinary namespace
+ namespace = id;
+ title = m[2];
+
+ // For Talk:X pages, make sure X has no "namespace" prefix
+ if ( namespace === NS_TALK && ( m = title.match( rSplit ) ) ) {
+ // Disallow titles like Talk:File:x (subject should roundtrip: talk:file:x -> file:x -> file_talk:x)
+ if ( getNsIdByName( m[1] ) !== false ) {
+ return false;
+ }
+ }
+ }
+ }
+
+ // Process fragment
+ i = title.indexOf( '#' );
+ if ( i === -1 ) {
+ fragment = null;
+ } else {
+ fragment = title
+ // Get segment starting after the hash
+ .substr( i + 1 )
+ // Convert to text
+ // NB: Must not be trimmed ("Example#_foo" is not the same as "Example#foo")
+ .replace( /_/g, ' ' );
+
+ title = title
+ // Strip hash
+ .substr( 0, i )
+ // Trim underscores, again (strips "_" from "bar" in "Foo_bar_#quux")
+ .replace( rUnderscoreTrim, '' );
+ }
+
+
+ // Reject illegal characters
+ if ( title.match( rInvalid ) ) {
+ return false;
+ }
+
+ // Disallow titles that browsers or servers might resolve as directory navigation
+ if (
+ title.indexOf( '.' ) !== -1 && (
+ title === '.' || title === '..' ||
+ title.indexOf( './' ) === 0 ||
+ title.indexOf( '../' ) === 0 ||
+ title.indexOf( '/./' ) !== -1 ||
+ title.indexOf( '/../' ) !== -1 ||
+ title.substr( -2 ) === '/.' ||
+ title.substr( -3 ) === '/..'
+ )
+ ) {