feat(ivy): add element instruction (#23899)

Adds a simplified element instruction that can be used if an element
has no children.

PR Close #23899

packages/compiler/src/render3/r3_identifiers.ts

@@ -17,10 +17,12 @@ export class Identifiers {
   static PATCH_DEPS = 'patchedDeps';
 
   /* Instructions */
-  static createElement: o.ExternalReference = {name: 'ɵE', moduleName: CORE};
+  static elementStart: o.ExternalReference = {name: 'ɵE', moduleName: CORE};
 
   static elementEnd: o.ExternalReference = {name: 'ɵe', moduleName: CORE};
 
+  static element: o.ExternalReference = {name: 'ɵEe', moduleName: CORE};
+
   static elementProperty: o.ExternalReference = {name: 'ɵp', moduleName: CORE};
 
   static elementAttribute: o.ExternalReference = {name: 'ɵa', moduleName: CORE};

packages/compiler/src/render3/view/template.ts

@@ -314,11 +314,20 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
     if (i18nMessages.length > 0) {
       this._creationCode.push(...i18nMessages);
     }
-    this.instruction(
+
-        this._creationCode, element.sourceSpan, R3.createElement, ...trimTrailingNulls(parameters));
+    let isSelfClosingElement = element.outputs.length === 0 && element.children.length === 0;
+
 
     const implicit = o.variable(CONTEXT_NAME);
 
+    if (isSelfClosingElement) {
+      this.instruction(
+          this._creationCode, element.sourceSpan, R3.element, ...trimTrailingNulls(parameters));
+    } else {
+      this.instruction(
+          this._creationCode, element.sourceSpan, R3.elementStart,
+          ...trimTrailingNulls(parameters));
+
       // Generate Listeners (outputs)
       element.outputs.forEach((outputAst: t.BoundEvent) => {
         const elName = sanitizeIdentifier(element.name);
@@ -331,7 +340,8 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
                   lhsVar.set(rhsExpression).toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final]));
             });
         const bindingExpr = convertActionBinding(
-          bindingScope, implicit, outputAst.handler, 'b', () => error('Unexpected interpolation'));
+            bindingScope, implicit, outputAst.handler, 'b',
+            () => error('Unexpected interpolation'));
         const handler = o.fn(
             [new o.FnParam('$event', o.DYNAMIC_TYPE)], [...localVars, ...bindingExpr.render3Stmts],
             o.INFERRED_TYPE, null, functionName);
@@ -339,7 +349,7 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
             this._creationCode, outputAst.sourceSpan, R3.listener, o.literal(outputAst.name),
             handler);
       });
-
+    }
 
     // Generate element input bindings
     element.inputs.forEach((input: t.BoundAttribute) => {
@@ -367,10 +377,11 @@ export class TemplateDefinitionBuilder implements t.Visitor<void>, LocalResolver
       t.visitAll(this, element.children);
     }
 
+    if (!isSelfClosingElement) {
       // Finish element construction mode.
       this.instruction(
           this._creationCode, element.endSourceSpan || element.sourceSpan, R3.elementEnd);
-
+    }
     // Restore the state before exiting this node
     this._inI18nSection = wasInI18nSection;
   }

packages/compiler/test/render3/r3_compiler_compliance_spec.ts

@@ -90,8 +90,7 @@ describe('compiler compliance', () => {
       const template = `
         template: function MyComponent_Template(rf: IDENT, ctx: IDENT) {
           if (rf & 1) {
-            $r3$.ɵE(0, 'div');
+            $r3$.ɵEe(0, 'div');
-            $r3$.ɵe();
           }
           if (rf & 2) {
             $r3$.ɵp(0, 'id', $r3$.ɵb(ctx.id));
@@ -135,9 +134,8 @@ describe('compiler compliance', () => {
       const template = `
         template: function MyComponent_Template(rf: IDENT, ctx: IDENT) {
           if (rf & 1) {
-            $r3$.ɵE(0, 'div');
+            $r3$.ɵEe(0, 'div');
             $r3$.ɵPp(1,'pipe');
-            $r3$.ɵe();
             $r3$.ɵrS(10);
           }
           if (rf & 2) {
@@ -181,8 +179,7 @@ describe('compiler compliance', () => {
       const template = `
         template: function MyComponent_Template(rf: IDENT, ctx: IDENT) {
           if (rf & 1) {
-            $r3$.ɵE(0, 'div');
+            $r3$.ɵEe(0, 'div');
-            $r3$.ɵe();
           }
           if (rf & 2) {
             $r3$.ɵkn(0, 'error', $r3$.ɵb(ctx.error));
@@ -254,8 +251,7 @@ describe('compiler compliance', () => {
           factory: function MyComponent_Factory() { return new MyComponent(); },
           template: function MyComponent_Template(rf: IDENT, ctx: IDENT) {
             if (rf & 1) {
-              $r3$.ɵE(0, 'child', $c1$);
+              $r3$.ɵEe(0, 'child', $c1$);
-              $r3$.ɵe();
               $r3$.ɵT(1, '!');
             }
           },
@@ -461,8 +457,7 @@ describe('compiler compliance', () => {
             factory: function MyApp_Factory() { return new MyApp(); },
             template: function MyApp_Template(rf: $RenderFlags$, ctx: $MyApp$) {
               if (rf & 1) {
-                $r3$.ɵE(0, 'my-comp');
+                $r3$.ɵEe(0, 'my-comp');
-                $r3$.ɵe();
                 $r3$.ɵrS(2);
               }
               if (rf & 2) {
@@ -541,8 +536,7 @@ describe('compiler compliance', () => {
             factory: function MyApp_Factory() { return new MyApp(); },
             template: function MyApp_Template(rf: $RenderFlags$, ctx: $MyApp$) {
               if (rf & 1) {
-                $r3$.ɵE(0, 'my-comp');
+                $r3$.ɵEe(0, 'my-comp');
-                $r3$.ɵe();
                 $r3$.ɵrS(10);
               }
               if (rf & 2) {
@@ -603,8 +597,7 @@ describe('compiler compliance', () => {
             factory: function MyApp_Factory() { return new MyApp(); },
             template: function MyApp_Template(rf: $RenderFlags$, ctx: $MyApp$) {
               if (rf & 1) {
-                $r3$.ɵE(0, 'object-comp');
+                $r3$.ɵEe(0, 'object-comp');
-                $r3$.ɵe();
                 $r3$.ɵrS(2);
               }
               if (rf & 2) {
@@ -669,8 +662,7 @@ describe('compiler compliance', () => {
             factory: function MyApp_Factory() { return new MyApp(); },
             template: function MyApp_Template(rf: $RenderFlags$, ctx: $MyApp$) {
               if (rf & 1) {
-                $r3$.ɵE(0, 'nested-comp');
+                $r3$.ɵEe(0, 'nested-comp');
-                $r3$.ɵe();
                 $r3$.ɵrS(7);
               }
               if (rf & 2) {
@@ -814,8 +806,7 @@ describe('compiler compliance', () => {
               var $tmp$: $any$;
               if (rf & 1) {
                 $r3$.ɵQ(0, SomeDirective, true);
-                $r3$.ɵE(1, 'div', $e0_attrs$);
+                $r3$.ɵEe(1, 'div', $e0_attrs$);
-                $r3$.ɵe();
               }
               if (rf & 2) {
                 ($r3$.ɵqR(($tmp$ = $r3$.ɵld(0))) && (ctx.someDir = $tmp$.first));
@@ -1009,8 +1000,7 @@ describe('compiler compliance', () => {
           factory: function MyComponent_Factory() { return new MyComponent(); },
           template: function MyComponent_Template(rf: IDENT, ctx: IDENT) {
             if (rf & 1) {
-              $r3$.ɵE(0, 'input', null, $c1$);
+              $r3$.ɵEe(0, 'input', null, $c1$);
-              $r3$.ɵe();
               $r3$.ɵT(2);
             }
             const $user$ = $r3$.ɵld(1);
@@ -1089,10 +1079,8 @@ describe('compiler compliance', () => {
             factory: function SimpleLayout_Factory() { return new SimpleLayout(); },
             template: function SimpleLayout_Template(rf: IDENT, ctx: IDENT) {
               if (rf & 1) {
-                $r3$.ɵE(0, 'lifecycle-comp');
+                $r3$.ɵEe(0, 'lifecycle-comp');
-                $r3$.ɵe();
+                $r3$.ɵEe(1, 'lifecycle-comp');
-                $r3$.ɵE(1, 'lifecycle-comp');
-                $r3$.ɵe();
               }
               if (rf & 2) {
                 $r3$.ɵp(0, 'name', $r3$.ɵb(ctx.name1));

packages/compiler/test/render3/r3_view_compiler_binding_spec.ts

@@ -75,8 +75,7 @@ describe('compiler compliance: bindings', () => {
       const template = `
       template:function MyComponent_Template(rf: IDENT, $ctx$: IDENT){
         if (rf & 1) {
-          $i0$.ɵE(0, 'a');
+          $i0$.ɵEe(0, 'a');
-          $i0$.ɵe();
         }
         if (rf & 2) {
           $i0$.ɵp(0, 'title', $i0$.ɵb($ctx$.title));
@@ -108,8 +107,7 @@ describe('compiler compliance: bindings', () => {
       const template = `
       template:function MyComponent_Template(rf: IDENT, $ctx$: IDENT){
         if (rf & 1) {
-          $i0$.ɵE(0, 'a');
+          $i0$.ɵEe(0, 'a');
-          $i0$.ɵe();
         }
         if (rf & 2) {
           $i0$.ɵp(0, 'title', $i0$.ɵi1('Hello ', $ctx$.name, ''));

packages/compiler/test/render3/r3_view_compiler_i18n_spec.ts

@@ -148,8 +148,7 @@ describe('i18n support in the view compiler', () => {
       …
       template: function MyComponent_Template(rf: IDENT, ctx: IDENT) {
         if (rf & 1) {
-          $r3$.ɵE(0, 'div', $c1$);
+          $r3$.ɵEe(0, 'div', $c1$);
-          $r3$.ɵe();
         }
       }
     `;

packages/compiler/test/render3/r3_view_compiler_template_spec.ts

@@ -109,4 +109,43 @@ describe('compiler compliance: template', () => {
     expectEmit(result.source, template, 'Incorrect template');
   });
 
+  // tslint:disable-next-line:ban
+  describe('element with no children', () => {
+    it('should just use the element instruction', () => {
+      const files = {
+        app: {
+          'spec.ts': `
+                import {Component, NgModule} from '@angular/core';
+                import {CommonModule} from '@angular/common';
+
+                @Component({
+                  selector: 'my-component',
+                  template: \`
+                    <div></div>\`
+                })
+                export class MyComponent {
+                }
+
+                @NgModule({declarations: [MyComponent], imports: [CommonModule]})
+                export class MyModule {}
+            `
+        }
+      };
+
+      const template = `
+        // ...
+        template:function MyComponent_Template(rf: IDENT, $ctx$: IDENT){
+          if (rf & 1) {
+            $i0$.ɵEe(0,'div');
+          }
+        }`;
+
+      debugger;
+
+      const result = compile(files, angularFiles);
+
+      expectEmit(result.source, template, 'Incorrect template');
+    });
+  });
+
 });

packages/core/src/core_render3_private_export.ts

@@ -28,6 +28,7 @@ export {
   NC as ɵNC,
   C as ɵC,
   E as ɵE,
+  Ee as ɵEe,
   L as ɵL,
   T as ɵT,
   V as ɵV,

packages/core/src/render3/index.ts

@@ -50,6 +50,7 @@ export {
   elementEnd as e,
   elementProperty as p,
   elementStart as E,
+  element as Ee,
   elementStyle as s,
   elementStyleNamed as sn,
 

packages/core/src/render3/instructions.ts

@@ -1032,6 +1032,15 @@ export function elementEnd() {
   queueLifecycleHooks(previousOrParentNode.tNode.flags, currentView);
 }
 
+/** Marks the beginning and end of an element in one call. */
+export function element(
+    index: number, name: string, attrs?: TAttributes | null | undefined,
+    localRefs?: string[] | null | undefined): RElement {
+  const relement = elementStart(index, name, attrs, localRefs);
+  elementEnd();
+  return relement;
+}
+
 /**
  * Updates the value of removes an attribute on an Element.
  *

packages/core/src/render3/node_selector_matcher.ts

@@ -12,6 +12,7 @@ import {assertNotNull} from './assert';
 import {AttributeMarker, TAttributes, TNode, unusedValueExportToPlacateAjd as unused1} from './interfaces/node';
 import {CssSelector, CssSelectorList, NG_PROJECT_AS_ATTR_NAME, SelectorFlags, unusedValueExportToPlacateAjd as unused2} from './interfaces/projection';
 
+
 const unusedValueToPlacateAjd = unused1 + unused2;
 
 function isCssClassMatching(nodeClassAttrVal: string, cssClassToMatch: string): boolean {

packages/core/test/render3/compiler_canonical/component_directives_spec.ts

@@ -69,8 +69,7 @@ describe('components & directives', () => {
         factory: () => new MyComponent(),
         template: function(rf: $RenderFlags$, ctx: $MyComponent$) {
           if (rf & 1) {
-            $r3$.ɵE(0, 'child', $e0_attrs$);
+            $r3$.ɵEe(0, 'child', $e0_attrs$);
-            $r3$.ɵe();
             $r3$.ɵT(1, '!');
           }
         }
@@ -455,8 +454,7 @@ describe('components & directives', () => {
           factory: function MyApp_Factory() { return new MyApp(); },
           template: function MyApp_Template(rf: $RenderFlags$, ctx: $MyApp$) {
             if (rf & 1) {
-              $r3$.ɵE(0, 'my-array-comp');
+              $r3$.ɵEe(0, 'my-array-comp');
-              $r3$.ɵe();
             }
             if (rf & 2) {
               $r3$.ɵp(0, 'names', rf & 1 ? $e0_arr$ : $r3$.ɵNC);
@@ -500,8 +498,7 @@ describe('components & directives', () => {
           factory: function MyApp_Factory() { return new MyApp(); },
           template: function MyApp_Template(rf: $RenderFlags$, ctx: $MyApp$) {
             if (rf & 1) {
-              $r3$.ɵE(0, 'my-array-comp');
+              $r3$.ɵEe(0, 'my-array-comp');
-              $r3$.ɵe();
               $r3$.ɵrS(1);
             }
             if (rf & 2) {
@@ -606,8 +603,7 @@ describe('components & directives', () => {
           factory: function MyApp_Factory() { return new MyApp(); },
           template: function MyApp_Template(rf: $RenderFlags$, ctx: $MyApp$) {
             if (rf & 1) {
-              $r3$.ɵE(0, 'my-array-comp');
+              $r3$.ɵEe(0, 'my-array-comp');
-              $r3$.ɵe();
               $r3$.ɵrS(2);
             }
             if (rf & 2) {
@@ -717,8 +713,7 @@ describe('components & directives', () => {
           factory: function MyApp_Factory() { return new MyApp(); },
           template: function MyApp_Template(rf: $RenderFlags$, c: $any$) {
             if (rf & 1) {
-              $r3$.ɵE(0, 'my-comp');
+              $r3$.ɵEe(0, 'my-comp');
-              $r3$.ɵe();
               $r3$.ɵrS(10);
             }
             if (rf & 2) {

packages/core/test/render3/compiler_canonical/query_spec.ts

@@ -58,8 +58,7 @@ describe('queries', () => {
           if (rf & 1) {
             $r3$.ɵQ(0, SomeDirective, false);
             $r3$.ɵQ(1, SomeDirective, false);
-            $r3$.ɵE(2, 'div', $e1_attrs$);
+            $r3$.ɵEe(2, 'div', $e1_attrs$);
-            $r3$.ɵe();
           }
           if (rf & 2) {
             $r3$.ɵqR($tmp$ = $r3$.ɵld<QueryList<any>>(0)) && (ctx.someDir = $tmp$.first);

packages/core/test/render3/instructions_spec.ts

@@ -10,14 +10,14 @@ import {NgForOfContext} from '@angular/common';
 
 import {RenderFlags, directiveInject} from '../../src/render3';
 import {defineComponent} from '../../src/render3/definition';
-import {bind, container, elementAttribute, elementClass, elementEnd, elementProperty, elementStart, elementStyle, elementStyleNamed, interpolation1, renderTemplate, setHtmlNS, setSvgNS, text, textBinding} from '../../src/render3/instructions';
+import {bind, container, element, elementAttribute, elementClass, elementEnd, elementProperty, elementStart, elementStyle, elementStyleNamed, interpolation1, renderTemplate, setHtmlNS, setSvgNS, text, textBinding} from '../../src/render3/instructions';
 import {LElementNode, LNode, NS} from '../../src/render3/interfaces/node';
 import {RElement, domRendererFactory3} from '../../src/render3/interfaces/renderer';
 import {TrustedString, bypassSanitizationTrustHtml, bypassSanitizationTrustResourceUrl, bypassSanitizationTrustScript, bypassSanitizationTrustStyle, bypassSanitizationTrustUrl, sanitizeHtml, sanitizeResourceUrl, sanitizeScript, sanitizeStyle, sanitizeUrl} from '../../src/sanitization/sanitization';
 import {Sanitizer, SecurityContext} from '../../src/sanitization/security';
 
 import {NgForOf} from './common_with_def';
-import {ComponentFixture, TemplateFixture} from './render_util';
+import {ComponentFixture, TemplateFixture, toHtml} from './render_util';
 
 describe('instructions', () => {
   function createAnchor() {
@@ -94,13 +94,12 @@ describe('instructions', () => {
 
     it('should use sanitizer function even on elements with namespaced attributes', () => {
       const t = new TemplateFixture(() => {
-        elementStart(0, 'div', [
+        element(0, 'div', [
           NS.FULL,
           'http://www.example.com/2004/test',
           'whatever',
           'abc',
         ]);
-        elementEnd();
       });
 
       t.update(() => elementAttribute(0, 'title', 'javascript:true', sanitizeUrl));
@@ -451,8 +450,7 @@ describe('instructions', () => {
           'title',
           'abc',
         ]);
-        elementStart(2, 'circle', ['cx', '200', 'cy', '150', 'fill', '#0000ff']);
+        element(2, 'circle', ['cx', '200', 'cy', '150', 'fill', '#0000ff']);
-        elementEnd();
         elementEnd();
         setHtmlNS();
         elementEnd();
@@ -470,7 +468,7 @@ describe('instructions', () => {
 
     it('should set an attribute with a namespace', () => {
       const t = new TemplateFixture(() => {
-        elementStart(0, 'div', [
+        element(0, 'div', [
           'id',
           'container',
           // test:title="abc"
@@ -479,7 +477,6 @@ describe('instructions', () => {
           'title',
           'abc',
         ]);
-        elementEnd();
       });
 
       const standardHTML = '<div id="container" title="abc"></div>';
@@ -490,7 +487,7 @@ describe('instructions', () => {
 
     it('should set attributes including more than one namespaced attribute', () => {
       const t = new TemplateFixture(() => {
-        elementStart(0, 'div', [
+        element(0, 'div', [
           'id',
           'container',
 
@@ -516,7 +513,6 @@ describe('instructions', () => {
           'shazbot',
           'wocka wocka',
         ]);
-        elementEnd();
       });
 
       const standardHTML =