feat(rule): add special case to no-input-rename rule

src/noInputRenameRule.ts

@@ -1,6 +1,7 @@
 import * as Lint from 'tslint';
 import * as ts from 'typescript';
 import { sprintf } from 'sprintf-js';
+import { DirectiveMetadata } from './angular/metadata';
 import { NgWalker } from './angular/ngWalker';
 
 export class Rule extends Lint.Rules.AbstractRule {
@@ -15,29 +16,31 @@ export class Rule extends Lint.Rules.AbstractRule {
     typescriptOnly: true,
   };
 
-  static FAILURE_STRING: string = 'In the class "%s", the directive ' +
-    'input property "%s" should not be renamed.' +
-    'Please, consider the following use "@Input() %s: string"';
+  static FAILURE_STRING: string = 'In the class "%s", the directive input property "%s" should not be renamed.';
 
   public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
-    return this.applyWithWalker(
-      new InputMetadataWalker(sourceFile,
-        this.getOptions()));
+    return this.applyWithWalker(new InputMetadataWalker(sourceFile, this.getOptions()));
   }
 }
 
 export class InputMetadataWalker extends NgWalker {
+  private directiveSelector: DirectiveMetadata['selector'][];
+
+  visitNgDirective(metadata: DirectiveMetadata): void {
+    this.directiveSelector =
+        (metadata.selector || '').replace(/[\[\]\s]/g, '').split(',');
+  }
+
   visitNgInput(property: ts.PropertyDeclaration, input: ts.Decorator, args: string[]) {
-    let className = (<any>property).parent.name.text;
-    let memberName = (<any>property.name).text;
-    if (args.length !== 0 && memberName !== args[0]) {
-      let failureConfig: string[] = [className, memberName, memberName];
-      failureConfig.unshift(Rule.FAILURE_STRING);
-      this.addFailure(
-        this.createFailure(
-          property.getStart(),
-          property.getWidth(),
-          sprintf.apply(this, failureConfig)));
+    const className = (property.parent as any).name.text;
+    const memberName = (property.name as any).text;
+
+    if (args.length === 0 ||
+      (this.directiveSelector && this.directiveSelector.indexOf(memberName) !== -1)) {
+      return;
     }
+
+    const failureConfig = [Rule.FAILURE_STRING, className, memberName];
+    this.addFailureAtNode(property, sprintf.apply(this, failureConfig));
   }
 }

test/noInputRenameRule.spec.ts

@@ -1,37 +1,111 @@
 import { assertSuccess, assertAnnotated } from './testHelper';
 
-describe('no-input-rename', () => {
-  describe('invalid directive input property', () => {
-    it('should fail, when a directive input property is renamed', () => {
-      let source = `
-      class ButtonComponent {
-        @Input('labelAttribute') label: string;
-        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-      }`;
-      assertAnnotated({
-        ruleName: 'no-input-rename',
-        message: 'In the class "ButtonComponent", the directive input property "label" should not be renamed.' +
-        'Please, consider the following use "@Input() label: string"',
-        source
+const ruleName = 'no-input-rename';
+
+const getMessage = (className: string, propertyName: string): string => {
+  return `In the class "${className}", the directive input property "${propertyName}" should not be renamed.`;
+};
+
+describe(ruleName, () => {
+  describe('failure', () => {
+    describe('Component', () => {
+      it('should fail when a input property is renamed', () => {
+        const source = `
+          @Component
+          class TestComponent {
+            @Input('labelAttribute') label: string;
+            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+          }
+        `;
+
+        assertAnnotated({
+          ruleName,
+          message: getMessage('TestComponent', 'label'),
+          source
+        });
+      });
+
+      it('should fail when input property is fake renamed', () => {
+        const source = `
+          @Component
+          class TestComponent {
+            @Input('label') label: string;
+            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+          }
+        `;
+
+        assertAnnotated({
+          ruleName,
+          message: getMessage('TestComponent', 'label'),
+          source
+        });
+      });
+    });
+
+    describe('Directive', () => {
+      it('should fail when a input property is renamed', () => {
+        const source = `
+          @Directive
+          class TestDirective {
+            @Input('labelText') label: string;
+            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+          }
+        `;
+
+        assertAnnotated({
+          ruleName,
+          message: getMessage('TestDirective', 'label'),
+          source
+        });
+      });
+
+      it(`should fail when input property is renamed and it's different from directive's selector`, () => {
+        const source = `
+          @Directive({
+            selector: '[label], label2'
+          })
+          class TestDirective {
+            @Input('label') labelText: string;
+            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+          }
+        `;
+
+        assertAnnotated({
+          ruleName,
+          message: getMessage('TestDirective', `labelText`),
+          source
+        });
       });
     });
   });
 
-  describe('valid directive input property', () => {
-    it('should succeed, when a directive input property is properly used', () => {
-      let source = `
-      class ButtonComponent {
-        @Input() label: string;
-      }`;
-      assertSuccess('no-input-rename', source);
+  describe('success', () => {
+    describe('Component', () => {
+      it('should succeed when a input property is not renamed', () => {
+        const source = `
+          @Component
+          class TestComponent {
+            @Input() label: string;
+          }
+        `;
+
+        assertSuccess(ruleName, source);
+      });
     });
 
-    it('should succeed, when a directive input property rename is the same as the name of the property', () => {
-      let source = `
-      class ButtonComponent {
-        @Input('label') label: string;
-      }`;
-      assertSuccess('no-input-rename', source);
+    describe('Directive', () => {
+      it('should succeed when the directive name is also an input property', () => {
+        const source = `
+          @Directive({
+            selector: '[label], label2'
+          })
+          class TestDirective {
+            @Input('labelText') label: string;
+          }
+        `;
+
+        assertSuccess(ruleName, source);
+      });
     });
   });
 });