refactor(compiler): simplify metadata

modules/angular2/src/compiler/api.ts

@@ -1,3 +1,4 @@
+import {isPresent} from 'angular2/src/core/facade/lang';
 import {HtmlAst} from './html_ast';
 
 export class TypeMeta {
@@ -54,18 +55,18 @@ export enum ViewEncapsulation {
 
 export class DirectiveMetadata {
   type: TypeMeta;
+  isComponent: boolean;
   selector: string;
-  constructor({type, selector}: {type?: TypeMeta, selector?: string} = {}) {
-    this.type = type;
-    this.selector = selector;
-  }
-}
-
-export class ComponentMetadata extends DirectiveMetadata {
   template: TemplateMeta;
-  constructor({type, selector, template}:
-                  {type?: TypeMeta, selector?: string, template?: TemplateMeta}) {
-    super({type: type, selector: selector});
+  constructor({type, isComponent, selector, template}: {
+    type?: TypeMeta,
+    isComponent?: boolean,
+    selector?: string,
+    template?: TemplateMeta
+  } = {}) {
+    this.type = type;
+    this.isComponent = isPresent(isComponent) ? isComponent : false;
+    this.selector = selector;
     this.template = template;
   }
 }

modules/angular2/src/compiler/template_parser.ts

@@ -12,7 +12,7 @@ import {
 
 import {Parser, AST, ASTWithSource} from 'angular2/src/core/change_detection/change_detection';
 
-import {DirectiveMetadata, ComponentMetadata} from './api';
+import {DirectiveMetadata} from './api';
 import {
   ElementAst,
   BoundPropertyAst,
@@ -279,8 +279,8 @@ class TemplateParseVisitor implements HtmlAstVisitor {
     // as selectorMatcher uses Maps inside.
     // Also need to make components the first directive in the array
     ListWrapper.sort(directives, (dir1: DirectiveMetadata, dir2: DirectiveMetadata) => {
-      var dir1Comp = dir1 instanceof ComponentMetadata;
-      var dir2Comp = dir2 instanceof ComponentMetadata;
+      var dir1Comp = dir1.isComponent;
+      var dir2Comp = dir2.isComponent;
       if (dir1Comp && !dir2Comp) {
         return -1;
       } else if (!dir1Comp && dir2Comp) {

modules/angular2/test/compiler/template_parser_spec.ts

@@ -3,7 +3,7 @@ import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach} from '
 import {Parser, Lexer} from 'angular2/src/core/change_detection/change_detection';
 import {TemplateParser, splitClasses} from 'angular2/src/compiler/template_parser';
 import {HtmlParser} from 'angular2/src/compiler/html_parser';
-import {DirectiveMetadata, ComponentMetadata, TypeMeta} from 'angular2/src/compiler/api';
+import {DirectiveMetadata, TypeMeta} from 'angular2/src/compiler/api';
 import {
   templateVisitAll,
   TemplateAstVisitor,
@@ -192,8 +192,8 @@ export function main() {
               new DirectiveMetadata({selector: '[a=b]', type: new TypeMeta({typeName: 'DirA'})});
           var dirB =
               new DirectiveMetadata({selector: '[a]', type: new TypeMeta({typeName: 'DirB'})});
-          var comp =
-              new ComponentMetadata({selector: 'div', type: new TypeMeta({typeName: 'ZComp'})});
+          var comp = new DirectiveMetadata(
+              {selector: 'div', isComponent: true, type: new TypeMeta({typeName: 'ZComp'})});
           expect(humanizeTemplateAsts(parse('<div a="b">', [dirB, dirA, comp])))
               .toEqual([
                 [ElementAst, [comp, dirA, dirB], 'TestComp > div:nth-child(0)'],