update rule generation template to use walk function

build-tasks/templates/rule.template.js

@@ -8,8 +8,6 @@ import {AstUtils} from './utils/AstUtils';
 // use Utils instead of Underscore functions // TODO: delete comment
 import {Utils} from './utils/Utils';
 
-const FAILURE_STRING: string = 'Some error message: '; // TODO: Define an error message
-
 export class Rule extends Lint.Rules.AbstractRule {
 
     public static metadata: ExtendedMetadata = {
@@ -28,16 +26,23 @@ export class Rule extends Lint.Rules.AbstractRule {
         commonWeaknessEnumeration: '...'   // if possible, please map your rule to a CWE (see cwe_descriptions.json and https://cwe.mitre.org)
     };
 
+    public static FAILURE_STRING: string = 'Some error message: '; // TODO: Define an error message
+
     public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
-        return this.applyWithWalker(new %WALKER_NAME%(sourceFile, this.getOptions()));
+        return this.applyWithFunction(sourceFile, walk);
     }
 }
 
-class ${walkerName} extends Lint.RuleWalker {
-
-    protected visitNode(node: ts.Node): void {
-        console.log(ts.SyntaxKind[node.kind] + ' ' + node.getText());
-        super.visitNode(node);
+function walk(ctx: Lint.WalkContext<void>) {
+    function cb(node: ts.Node): void {
+        const failingExpressionCondition = true; // TODO: Customize to rule.
+        if (failingExpressionCondition) {
+            const msg: string = Rule.FAILURE_STRING;
+            ctx.addFailureAt(node.getStart(), node.getWidth(), msg);
+        }
+        return ts.forEachChild(node, cb);
     }
+
+    return ts.forEachChild(ctx.sourceFile, cb);
 }
 `;