1 files changed, 49 insertions, 0 deletions
diff --git a/www/wiki/resources/src/mediawiki.rcfilters/mw.rcfilters.js b/www/wiki/resources/src/mediawiki.rcfilters/mw.rcfilters.js
new file mode 100644
index 00000000..c62d6f25
--- /dev/null
+++ b/www/wiki/resources/src/mediawiki.rcfilters/mw.rcfilters.js
@@ -0,0 +1,49 @@
+( function ( mw ) {
+	/**
+	 * @class
+	 * @singleton
+	 */
+	mw.rcfilters = {
+		dm: {},
+		ui: {},
+		utils: {
+			addArrayElementsUnique: function ( arr, elements ) {
+				elements = Array.isArray( elements ) ? elements : [ elements ];
+
+				elements.forEach( function ( element ) {
+					if ( arr.indexOf( element ) === -1 ) {
+						arr.push( element );
+					}
+				} );
+
+				return arr;
+			},
+			normalizeParamOptions: function ( givenOptions, legalOptions ) {
+				var result = [];
+
+				if ( givenOptions.indexOf( 'all' ) > -1 ) {
+					// If anywhere in the values there's 'all', we
+					// treat it as if only 'all' was selected.
+					// Example: param=valid1,valid2,all
+					// Result: param=all
+					return [ 'all' ];
+				}
+
+				// Get rid of any dupe and invalid parameter, only output
+				// valid ones
+				// Example: param=valid1,valid2,invalid1,valid1
+				// Result: param=valid1,valid2
+				givenOptions.forEach( function ( value ) {
+					if (
+						legalOptions.indexOf( value ) > -1 &&
+						result.indexOf( value ) === -1
+					) {
+						result.push( value );
+					}
+				} );
+
+				return result;
+			}
+		}
+	};
+}( mediaWiki ) );