test(ivy): support `className` in micro benchmarks (#33392)

The styling algorithm requires that the `RNode` has a `className`
property in order to execute the fast-path. This changes adds the
emulation of this property.

PR Close #33392

karma-js.conf.js

@@ -79,6 +79,7 @@ module.exports = function(config) {
       'dist/all/@angular/compiler/test/render3/**',
       'dist/all/@angular/core/test/bundling/**',
       'dist/all/@angular/core/test/render3/ivy/**',
+      'dist/all/@angular/core/test/render3/perf/**',
       'dist/all/@angular/elements/schematics/**',
       'dist/all/@angular/examples/**/e2e_test/*',
       'dist/all/@angular/language-service/**',

packages/core/test/render3/perf/BUILD.bazel

@@ -1,6 +1,6 @@
 package(default_visibility = ["//visibility:private"])
 
-load("//tools:defaults.bzl", "ng_rollup_bundle", "ts_library")
+load("//tools:defaults.bzl", "jasmine_node_test", "ng_rollup_bundle", "ts_library")
 
 ts_library(
     name = "perf_lib",
@@ -9,10 +9,18 @@ ts_library(
     ),
     deps = [
         "//packages/core",
+        "@npm//@types/jasmine",
         "@npm//@types/node",
     ],
 )
 
+jasmine_node_test(
+    name = "perf",
+    deps = [
+        ":perf_lib",
+    ],
+)
+
 ng_rollup_bundle(
     name = "class_binding",
     entry_point = ":class_binding/index.ts",

packages/core/test/render3/perf/noop_renderer.ts

@@ -7,7 +7,7 @@
  */
 import {ProceduralRenderer3, RComment, RElement, RNode, RText, Renderer3, RendererFactory3, RendererStyleFlags3} from '../../../src/render3/interfaces/renderer';
 
-export class WebWorkerRenderNode implements RNode, RComment, RText {
+export class MicroBenchmarkRenderNode implements RNode, RComment, RText {
   textContent: string|null = null;
   parentNode: RNode|null = null;
   parentElement: RElement|null = null;
@@ -15,15 +15,16 @@ export class WebWorkerRenderNode implements RNode, RComment, RText {
   removeChild(oldChild: RNode): RNode { return oldChild; }
   insertBefore(newChild: RNode, refChild: RNode|null, isViewRoot: boolean): void {}
   appendChild(newChild: RNode): RNode { return newChild; }
+  className: string = '';
 }
 
-export class NoopRenderer implements ProceduralRenderer3 {
+export class MicroBenchmarkRenderer implements ProceduralRenderer3 {
   destroy(): void { throw new Error('Method not implemented.'); }
-  createComment(value: string): RComment { return new WebWorkerRenderNode(); }
+  createComment(value: string): RComment { return new MicroBenchmarkRenderNode(); }
   createElement(name: string, namespace?: string|null|undefined): RElement {
-    return new WebWorkerRenderNode() as any as RElement;
+    return new MicroBenchmarkRenderNode() as any as RElement;
   }
-  createText(value: string): RText { return new WebWorkerRenderNode(); }
+  createText(value: string): RText { return new MicroBenchmarkRenderNode(); }
   destroyNode?: ((node: RNode) => void)|null|undefined;
   appendChild(parent: RElement, newChild: RNode): void {}
   insertBefore(parent: RNode, newChild: RNode, refChild: RNode|null): void {}
@@ -32,10 +33,21 @@ export class NoopRenderer implements ProceduralRenderer3 {
   parentNode(node: RNode): RElement|null { throw new Error('Method not implemented.'); }
   nextSibling(node: RNode): RNode|null { throw new Error('Method not implemented.'); }
   setAttribute(el: RElement, name: string, value: string, namespace?: string|null|undefined): void {
+    if (name === 'class' && isOurNode(el)) {
+      el.className = value;
+    }
   }
   removeAttribute(el: RElement, name: string, namespace?: string|null|undefined): void {}
-  addClass(el: RElement, name: string): void {}
-  removeClass(el: RElement, name: string): void {}
+  addClass(el: RElement, name: string): void {
+    if (isOurNode(el)) {
+      el.className = el.className === '' ? name : remove(el.className, name) + ' ' + name;
+    }
+  }
+  removeClass(el: RElement, name: string): void {
+    if (isOurNode(el)) {
+      el.className = remove(el.className, name);
+    }
+  }
   setStyle(el: RElement, style: string, value: any, flags?: RendererStyleFlags3|undefined): void {}
   removeStyle(el: RElement, style: string, flags?: RendererStyleFlags3|undefined): void {}
   setProperty(el: RElement, name: string, value: any): void {}
@@ -47,11 +59,39 @@ export class NoopRenderer implements ProceduralRenderer3 {
   }
 }
 
-export class NoopRendererFactory implements RendererFactory3 {
+export class MicroBenchmarkRendererFactory implements RendererFactory3 {
   createRenderer(hostElement: RElement|null, rendererType: null): Renderer3 {
     if (typeof global !== 'undefined') {
-      (global as any).Node = WebWorkerRenderNode;
+      (global as any).Node = MicroBenchmarkRenderNode;
     }
-    return new NoopRenderer();
+    return new MicroBenchmarkRenderer();
   }
 }
+
+function isOurNode(node: any): node is MicroBenchmarkRenderNode {
+  return node instanceof MicroBenchmarkRenderNode;
+}
+
+const enum Code {
+  SPACE = 32,
+}
+
+function remove(text: string, key: string): string {
+  let wasLastWhitespace = true;
+  for (let i = 0; i < text.length; i++) {
+    if (wasLastWhitespace) {
+      const start = i;
+      let same = true;
+      let k = 0;
+      while (k < key.length && (same = text.charCodeAt(i) === key.charCodeAt(k))) {
+        k++;
+        i++;
+      }
+      if (same && text.charCodeAt(i) == Code.SPACE) {
+        return text.substring(0, start) + text.substring(i + 1);
+      }
+    }
+    wasLastWhitespace = text.charCodeAt(i) <= Code.SPACE;
+  }
+  return text;
+}

packages/core/test/render3/perf/noop_renderer_spec.ts

@@ -0,0 +1,38 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {ProceduralRenderer3} from '@angular/core/src/render3/interfaces/renderer';
+
+import {MicroBenchmarkRenderNode, MicroBenchmarkRendererFactory} from './noop_renderer';
+
+describe('MicroBenchmarkRenderNode', () => {
+  const renderer =
+      new MicroBenchmarkRendererFactory().createRenderer(null, null) as ProceduralRenderer3;
+  describe('className', () => {
+    it('should be available in global space', () => {
+      expect(Node).toBeDefined();
+      const node: any = new MicroBenchmarkRenderNode();
+      expect(node instanceof Node).toBeTruthy();
+    });
+
+    it('should emulate className', () => {
+      const node: any = new MicroBenchmarkRenderNode();
+      expect(node.className).toBe('');
+      renderer.setAttribute(node, 'foo', 'A AA BBB');
+      expect(node.className).toBe('');
+      renderer.setAttribute(node, 'class', 'A AA BBB');
+      expect(node.className).toBe('A AA BBB');
+      renderer.addClass(node, 'A');
+      expect(node.className).toBe('AA BBB A');
+      renderer.addClass(node, 'C');
+      expect(node.className).toBe('AA BBB A C');
+      renderer.removeClass(node, 'A');
+      expect(node.className).toBe('AA BBB C');
+    });
+  });
+});

packages/core/test/render3/perf/setup.ts

@@ -12,10 +12,11 @@ import {RendererFactory3, domRendererFactory3} from '../../../src/render3/interf
 import {LView, LViewFlags, TView} from '../../../src/render3/interfaces/view';
 import {insertView} from '../../../src/render3/node_manipulation';
 
-import {NoopRendererFactory} from './noop_renderer';
+import {MicroBenchmarkRendererFactory} from './noop_renderer';
 
 const isBrowser = typeof process === 'undefined';
-const rendererFactory: RendererFactory3 = isBrowser ? domRendererFactory3 : new NoopRendererFactory;
+const rendererFactory: RendererFactory3 =
+    isBrowser ? domRendererFactory3 : new MicroBenchmarkRendererFactory;
 const renderer = rendererFactory.createRenderer(null, null);
 
 export function createAndRenderLView(