Require period prefix for custom filter operator functions

To ensure that custom filter operators cannot clash with future core operators.

core/modules/filters/unknown.js

@@ -20,8 +20,8 @@ var fieldFilterOperatorFn = require("$:/core/modules/filters/field.js").field;
 Export our filter function
 */
 exports["[unknown]"] = function(source,operator,options) {
-	var customDefinitionTitle = "[" + operator.operator + "[]]",
-		customDefinition = options.widget && options.widget.getVariableInfo && options.widget.getVariableInfo(customDefinitionTitle);
+	if(operator.operator.charAt(0) === ".") {
+		var customDefinition = options.widget && options.widget.getVariableInfo && options.widget.getVariableInfo(operator.operator);
 		if(customDefinition && customDefinition.srcVariable && customDefinition.srcVariable.isFunctionDefinition) {
 			var variables = Object.create(null);
 			$tw.utils.each(customDefinition.srcVariable.params,function(param,index) {
@@ -59,9 +59,9 @@ exports["[unknown]"] = function(source,operator,options) {
 			} else {
 				return list;
 			}
-	} else {
-		return fieldFilterOperatorFn(source,operator,options);
 		}
+	}
+	return fieldFilterOperatorFn(source,operator,options);
 };
 
 })();

editions/test/tiddlers/tests/data/custom-operators/NestedParameterised.tid

@@ -6,17 +6,17 @@ tags: [[$:/tags/wiki-test-spec]]
 title: Output
 
 \whitespace trim
-\function [dividebysomething[]](first:ignored,factor:0.5)
+\function .dividebysomething(first:ignored,factor:0.5)
 [divide[2]multiply<factor>]
 \end
 
-\function [multiplebysomething[]](first:ignored,factor:2)
-[multiply[2]dividebysomething[],<factor>]
+\function .multiplebysomething(first:ignored,factor:2)
+[multiply[2].dividebysomething[],<factor>]
 \end
 
-<$text text={{{ [[123]multiplebysomething[]] }}}/>
+<$text text={{{ [[123].multiplebysomething[]] }}}/>
 -
-<$text text={{{ [[123]multiplebysomething[x],[4]] }}}/>
+<$text text={{{ [[123].multiplebysomething[x],[4]] }}}/>
 
 +
 title: ExpectedResult

editions/test/tiddlers/tests/data/custom-operators/Parameterised.tid

@@ -6,13 +6,13 @@ tags: [[$:/tags/wiki-test-spec]]
 title: Output
 
 \whitespace trim
-\function [multiplybysomething[]](first:ignored,factor:2)
+\function .multiplybysomething(first:ignored,factor:2)
 [multiply[2]multiply<factor>]
 \end
 
-<$text text={{{ [[123]multiplybysomething[]] }}}/>
+<$text text={{{ [[123].multiplybysomething[]] }}}/>
 -
-<$text text={{{ [[123]multiplybysomething[x],[4]] }}}/>
+<$text text={{{ [[123].multiplybysomething[x],[4]] }}}/>
 
 +
 title: ExpectedResult

editions/test/tiddlers/tests/data/custom-operators/Simple.tid

@@ -5,11 +5,11 @@ tags: [[$:/tags/wiki-test-spec]]
 
 title: Output
 
-\function [multiplybytwo[]]()
+\function .multiplybytwo()
 [multiply[2]]
 \end
 
-<$text text={{{ [[123]multiplybytwo[]] }}}/>
+<$text text={{{ [[123].multiplybytwo[]] }}}/>
 +
 title: ExpectedResult