angular-cn/modules/@angular/compiler/test/template_parser/template_parser_spec.ts

/**
 * @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 {CompileDiDependencyMetadata, CompileDirectiveMetadata, CompilePipeMetadata, CompileProviderMetadata, CompileQueryMetadata, CompileTemplateMetadata, CompileTokenMetadata, CompileTypeMetadata} from '@angular/compiler/src/compile_metadata';
import {DomElementSchemaRegistry} from '@angular/compiler/src/schema/dom_element_schema_registry';
import {ElementSchemaRegistry} from '@angular/compiler/src/schema/element_schema_registry';
import {AttrAst, BoundDirectivePropertyAst, BoundElementPropertyAst, BoundEventAst, BoundTextAst, DirectiveAst, ElementAst, EmbeddedTemplateAst, NgContentAst, PropertyBindingType, ProviderAstType, ReferenceAst, TemplateAst, TemplateAstVisitor, TextAst, VariableAst, templateVisitAll} from '@angular/compiler/src/template_parser/template_ast';
import {TEMPLATE_TRANSFORMS, TemplateParser, splitClasses} from '@angular/compiler/src/template_parser/template_parser';
import {MockSchemaRegistry} from '@angular/compiler/testing';
import {SchemaMetadata, SecurityContext} from '@angular/core';
import {Console} from '@angular/core/src/console';
import {TestBed} from '@angular/core/testing';
import {afterEach, beforeEach, beforeEachProviders, ddescribe, describe, expect, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
import {Identifiers, identifierToken} from '../../src/identifiers';
import {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from '../../src/html_parser/interpolation_config';

import {unparse} from '../expression_parser/unparser';
import {TEST_COMPILER_PROVIDERS} from '../test_bindings';

var someModuleUrl = 'package:someModule';

var MOCK_SCHEMA_REGISTRY = [{
  provide: ElementSchemaRegistry,
  useValue: new MockSchemaRegistry({'invalidProp': false}, {'mappedAttr': 'mappedProp'})
}];

export function main() {
  var ngIf: CompileDirectiveMetadata;
  var parse:
      (template: string, directives: CompileDirectiveMetadata[], pipes?: CompilePipeMetadata[]) =>
          TemplateAst[];
  var console: ArrayConsole;

  function commonBeforeEach() {
    beforeEach(() => {
      console = new ArrayConsole();
      TestBed.configureCompiler({providers: [{provide: Console, useValue: console}]});
    });
    beforeEach(inject([TemplateParser], (parser: TemplateParser) => {
      var component = CompileDirectiveMetadata.create({
        selector: 'root',
        type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'Root'}),
        isComponent: true
      });
      ngIf = CompileDirectiveMetadata.create({
        selector: '[ngIf]',
        type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'NgIf'}),
        inputs: ['ngIf']
      });

      parse =
          (template: string, directives: CompileDirectiveMetadata[],
           pipes: CompilePipeMetadata[] = null, schemas: SchemaMetadata[] = []): TemplateAst[] => {
            if (pipes === null) {
              pipes = [];
            }
            return parser.parse(component, template, directives, pipes, schemas, 'TestComp');
          };
    }));
  }

  describe('TemplateParser template transform', () => {
    beforeEach(() => { TestBed.configureCompiler({providers: TEST_COMPILER_PROVIDERS}); });

    beforeEach(() => {
      TestBed.configureCompiler({
        providers:
            [{provide: TEMPLATE_TRANSFORMS, useValue: new FooAstTransformer(), multi: true}]
      });
    });

    describe('single', () => {
      commonBeforeEach();
      it('should transform TemplateAST', () => {
        expect(humanizeTplAst(parse('<div>', []))).toEqual([[ElementAst, 'foo']]);
      });
    });

    describe('multiple', () => {
      beforeEach(() => {
        TestBed.configureCompiler({
          providers:
              [{provide: TEMPLATE_TRANSFORMS, useValue: new BarAstTransformer(), multi: true}]
        });
      });

      commonBeforeEach();
      it('should compose transformers', () => {
        expect(humanizeTplAst(parse('<div>', []))).toEqual([[ElementAst, 'bar']]);
      });
    });
  });

  describe('TemplateParser Security', () => {
    // Semi-integration test to make sure TemplateParser properly sets the security context.
    // Uses the actual DomElementSchemaRegistry.
    beforeEach(() => {
      TestBed.configureCompiler({
        providers: [
          TEST_COMPILER_PROVIDERS,
          {provide: ElementSchemaRegistry, useClass: DomElementSchemaRegistry}
        ]
      });
    });

    commonBeforeEach();

    describe('security context', () => {
      function secContext(tpl: string): SecurityContext {
        let ast = parse(tpl, []);
        let propBinding = (<ElementAst>ast[0]).inputs[0];
        return propBinding.securityContext;
      }

      it('should set for properties', () => {
        expect(secContext('<div [title]="v">')).toBe(SecurityContext.NONE);
        expect(secContext('<div [innerHTML]="v">')).toBe(SecurityContext.HTML);
      });
      it('should set for property value bindings',
         () => { expect(secContext('<div innerHTML="{{v}}">')).toBe(SecurityContext.HTML); });
      it('should set for attributes', () => {
        expect(secContext('<a [attr.href]="v">')).toBe(SecurityContext.URL);
        // NB: attributes below need to change case.
        expect(secContext('<a [attr.innerHtml]="v">')).toBe(SecurityContext.HTML);
        expect(secContext('<a [attr.formaction]="v">')).toBe(SecurityContext.URL);
      });
      it('should set for style', () => {
        expect(secContext('<a [style.backgroundColor]="v">')).toBe(SecurityContext.STYLE);
      });
    });
  });

  describe('TemplateParser', () => {
    beforeEach(() => {
      TestBed.configureCompiler({providers: [TEST_COMPILER_PROVIDERS, MOCK_SCHEMA_REGISTRY]});
    });

    commonBeforeEach();

    describe('parse', () => {
      describe('nodes without bindings', () => {

        it('should parse text nodes', () => {
          expect(humanizeTplAst(parse('a', []))).toEqual([[TextAst, 'a']]);
        });

        it('should parse elements with attributes', () => {
          expect(humanizeTplAst(parse('<div a=b>', [
          ]))).toEqual([[ElementAst, 'div'], [AttrAst, 'a', 'b']]);
        });
      });

      it('should parse ngContent', () => {
        var parsed = parse('<ng-content select="a">', []);
        expect(humanizeTplAst(parsed)).toEqual([[NgContentAst]]);
      });

      it('should parse ngContent regardless the namespace', () => {
        var parsed = parse('<svg><ng-content></ng-content></svg>', []);
        expect(humanizeTplAst(parsed)).toEqual([
          [ElementAst, ':svg:svg'],
          [NgContentAst],
        ]);
      });

      it('should parse bound text nodes', () => {
        expect(humanizeTplAst(parse('{{a}}', []))).toEqual([[BoundTextAst, '{{ a }}']]);
      });

      it('should parse with custom interpolation config',
         inject([TemplateParser], (parser: TemplateParser) => {
           const component = CompileDirectiveMetadata.create({
             selector: 'test',
             type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'Test'}),
             isComponent: true,
             template: new CompileTemplateMetadata({interpolation: ['{%', '%}']})
           });
           expect(humanizeTplAst(parser.parse(component, '{%a%}', [], [], [], 'TestComp'), {
             start: '{%',
             end: '%}'
           })).toEqual([[BoundTextAst, '{% a %}']]);
         }));

      describe('bound properties', () => {

        it('should parse mixed case bound properties', () => {
          expect(humanizeTplAst(parse('<div [someProp]="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Property, 'someProp', 'v', null]
          ]);
        });

        it('should parse dash case bound properties', () => {
          expect(humanizeTplAst(parse('<div [some-prop]="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Property, 'some-prop', 'v', null]
          ]);
        });

        it('should normalize property names via the element schema', () => {
          expect(humanizeTplAst(parse('<div [mappedAttr]="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Property, 'mappedProp', 'v', null]
          ]);
        });

        it('should parse mixed case bound attributes', () => {
          expect(humanizeTplAst(parse('<div [attr.someAttr]="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Attribute, 'someAttr', 'v', null]
          ]);
        });

        it('should parse and dash case bound classes', () => {
          expect(humanizeTplAst(parse('<div [class.some-class]="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Class, 'some-class', 'v', null]
          ]);
        });

        it('should parse mixed case bound classes', () => {
          expect(humanizeTplAst(parse('<div [class.someClass]="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Class, 'someClass', 'v', null]
          ]);
        });

        it('should parse mixed case bound styles', () => {
          expect(humanizeTplAst(parse('<div [style.someStyle]="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Style, 'someStyle', 'v', null]
          ]);
        });

        it('should report invalid prefixes', () => {
          expect(() => parse('<p [atTr.foo]>', []))
              .toThrowError(
                  `Template parse errors:\nInvalid property name 'atTr.foo' ("<p [ERROR ->][atTr.foo]>"): TestComp@0:3`);
          expect(() => parse('<p [sTyle.foo]>', []))
              .toThrowError(
                  `Template parse errors:\nInvalid property name 'sTyle.foo' ("<p [ERROR ->][sTyle.foo]>"): TestComp@0:3`);
          expect(() => parse('<p [Class.foo]>', []))
              .toThrowError(
                  `Template parse errors:\nInvalid property name 'Class.foo' ("<p [ERROR ->][Class.foo]>"): TestComp@0:3`);
          expect(() => parse('<p [bar.foo]>', []))
              .toThrowError(
                  `Template parse errors:\nInvalid property name 'bar.foo' ("<p [ERROR ->][bar.foo]>"): TestComp@0:3`);
        });

        it('should parse bound properties via [...] and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div [prop]="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Property, 'prop', 'v', null]
          ]);
        });

        it('should parse bound properties via bind- and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div bind-prop="v">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Property, 'prop', 'v', null]
          ]);
        });

        it('should parse bound properties via {{...}} and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div prop="{{v}}">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Property, 'prop', '{{ v }}', null]
          ]);
        });

        it('should parse bound properties via animate- and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div animate-something="value2">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Animation, 'something', 'value2', null]
          ]);
        });

        it('should parse bound properties via @ and not report them as attributes and also report a deprecation warning',
           () => {
             expect(humanizeTplAst(parse('<div @something="value2">', []))).toEqual([
               [ElementAst, 'div'],
               [
                 BoundElementPropertyAst, PropertyBindingType.Animation, 'something', 'value2', null
               ]
             ]);

             expect(console.warnings).toEqual([[
               'Template parse warnings:',
               `Assigning animation triggers via @prop="exp" attributes with an expression is deprecated. Use [@prop]="exp" instead! ("<div [ERROR ->]@something="value2">"): TestComp@0:5`
             ].join('\n')]);
           });

        it('should issue a warning when host attributes contain a non property-bound animation trigger',
           () => {
             var dirA = CompileDirectiveMetadata.create({
               selector: 'div',
               type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
               host: {'@prop': 'expr'}
             });

             humanizeTplAst(parse('<div></div>', [dirA]));

             expect(console.warnings).toEqual([[
               'Template parse warnings:',
               `Assigning animation triggers within host data as attributes such as "@prop": "exp" is deprecated. Use "[@prop]": "exp" instead! ("[ERROR ->]<div></div>"): TestComp@0:0, Directive DirA`
             ].join('\n')]);
           });

        it('should not issue a warning when an animation property is bound without an expression',
           () => {
             humanizeTplAst(parse('<div @something>', []));
             expect(console.warnings.length).toEqual(0);
           });

        it('should parse bound properties via [@] and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div [@something]="value2">', []))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Animation, 'something', 'value2', null]
          ]);
        });
      });

      describe('events', () => {

        it('should parse bound events with a target', () => {
          expect(humanizeTplAst(parse('<div (window:event)="v">', [
          ]))).toEqual([[ElementAst, 'div'], [BoundEventAst, 'event', 'window', 'v']]);
        });

        it('should parse bound events via (...) and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div (event)="v">', [
          ]))).toEqual([[ElementAst, 'div'], [BoundEventAst, 'event', null, 'v']]);
        });

        it('should parse event names case sensitive', () => {
          expect(humanizeTplAst(parse('<div (some-event)="v">', [
          ]))).toEqual([[ElementAst, 'div'], [BoundEventAst, 'some-event', null, 'v']]);
          expect(humanizeTplAst(parse('<div (someEvent)="v">', [
          ]))).toEqual([[ElementAst, 'div'], [BoundEventAst, 'someEvent', null, 'v']]);
        });

        it('should parse bound events via on- and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div on-event="v">', [
          ]))).toEqual([[ElementAst, 'div'], [BoundEventAst, 'event', null, 'v']]);
        });

        it('should allow events on explicit embedded templates that are emitted by a directive',
           () => {
             var dirA = CompileDirectiveMetadata.create({
               selector: 'template',
               outputs: ['e'],
               type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
             });
             expect(humanizeTplAst(parse('<template (e)="f"></template>', [dirA]))).toEqual([
               [EmbeddedTemplateAst],
               [BoundEventAst, 'e', null, 'f'],
               [DirectiveAst, dirA],
             ]);
           });
      });

      describe('bindon', () => {
        it('should parse bound events and properties via [(...)] and not report them as attributes',
           () => {
             expect(humanizeTplAst(parse('<div [(prop)]="v">', []))).toEqual([
               [ElementAst, 'div'],
               [BoundElementPropertyAst, PropertyBindingType.Property, 'prop', 'v', null],
               [BoundEventAst, 'propChange', null, 'v = $event']
             ]);
           });

        it('should parse bound events and properties via bindon- and not report them as attributes',
           () => {
             expect(humanizeTplAst(parse('<div bindon-prop="v">', []))).toEqual([
               [ElementAst, 'div'],
               [BoundElementPropertyAst, PropertyBindingType.Property, 'prop', 'v', null],
               [BoundEventAst, 'propChange', null, 'v = $event']
             ]);
           });

      });

      describe('directives', () => {
        it('should order directives by the directives array in the View and match them only once',
           () => {
             var dirA = CompileDirectiveMetadata.create({
               selector: '[a]',
               type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
             });
             var dirB = CompileDirectiveMetadata.create({
               selector: '[b]',
               type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirB'})
             });
             var dirC = CompileDirectiveMetadata.create({
               selector: '[c]',
               type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirC'})
             });
             expect(humanizeTplAst(parse('<div a c b a b>', [dirA, dirB, dirC]))).toEqual([
               [ElementAst, 'div'], [AttrAst, 'a', ''], [AttrAst, 'c', ''], [AttrAst, 'b', ''],
               [AttrAst, 'a', ''], [AttrAst, 'b', ''], [DirectiveAst, dirA], [DirectiveAst, dirB],
               [DirectiveAst, dirC]
             ]);
           });

        it('should locate directives in property bindings', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: '[a=b]',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
          });
          var dirB = CompileDirectiveMetadata.create({
            selector: '[b]',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirB'})
          });
          expect(humanizeTplAst(parse('<div [a]="b">', [dirA, dirB]))).toEqual([
            [ElementAst, 'div'],
            [BoundElementPropertyAst, PropertyBindingType.Property, 'a', 'b', null],
            [DirectiveAst, dirA]
          ]);
        });

        it('should locate directives in event bindings', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: '[a]',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirB'})
          });

          expect(humanizeTplAst(parse('<div (a)="b">', [dirA]))).toEqual([
            [ElementAst, 'div'], [BoundEventAst, 'a', null, 'b'], [DirectiveAst, dirA]
          ]);
        });

        it('should parse directive host properties', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: 'div',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            host: {'[a]': 'expr'}
          });
          expect(humanizeTplAst(parse('<div></div>', [dirA]))).toEqual([
            [ElementAst, 'div'], [DirectiveAst, dirA],
            [BoundElementPropertyAst, PropertyBindingType.Property, 'a', 'expr', null]
          ]);
        });

        it('should parse directive host listeners', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: 'div',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            host: {'(a)': 'expr'}
          });
          expect(humanizeTplAst(parse('<div></div>', [dirA]))).toEqual([
            [ElementAst, 'div'], [DirectiveAst, dirA], [BoundEventAst, 'a', null, 'expr']
          ]);
        });

        it('should parse directive properties', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: 'div',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            inputs: ['aProp']
          });
          expect(humanizeTplAst(parse('<div [aProp]="expr"></div>', [dirA]))).toEqual([
            [ElementAst, 'div'], [DirectiveAst, dirA],
            [BoundDirectivePropertyAst, 'aProp', 'expr']
          ]);
        });

        it('should parse renamed directive properties', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: 'div',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            inputs: ['b:a']
          });
          expect(humanizeTplAst(parse('<div [a]="expr"></div>', [dirA]))).toEqual([
            [ElementAst, 'div'], [DirectiveAst, dirA], [BoundDirectivePropertyAst, 'b', 'expr']
          ]);
        });

        it('should parse literal directive properties', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: 'div',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            inputs: ['a']
          });
          expect(humanizeTplAst(parse('<div a="literal"></div>', [dirA]))).toEqual([
            [ElementAst, 'div'], [AttrAst, 'a', 'literal'], [DirectiveAst, dirA],
            [BoundDirectivePropertyAst, 'a', '"literal"']
          ]);
        });

        it('should favor explicit bound properties over literal properties', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: 'div',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            inputs: ['a']
          });
          expect(humanizeTplAst(parse('<div a="literal" [a]="\'literal2\'"></div>', [dirA])))
              .toEqual([
                [ElementAst, 'div'], [AttrAst, 'a', 'literal'], [DirectiveAst, dirA],
                [BoundDirectivePropertyAst, 'a', '"literal2"']
              ]);
        });

        it('should support optional directive properties', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: 'div',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            inputs: ['a']
          });
          expect(humanizeTplAst(parse('<div></div>', [dirA]))).toEqual([
            [ElementAst, 'div'], [DirectiveAst, dirA]
          ]);
        });

      });

      describe('providers', () => {
        var nextProviderId: any /** TODO #9100 */;

        function createToken(value: string): CompileTokenMetadata {
          var token: any /** TODO #9100 */;
          if (value.startsWith('type:')) {
            token = new CompileTokenMetadata({
              identifier:
                  new CompileTypeMetadata({moduleUrl: someModuleUrl, name: value.substring(5)})
            });
          } else {
            token = new CompileTokenMetadata({value: value});
          }
          return token;
        }

        function createDep(value: string): CompileDiDependencyMetadata {
          var isOptional = false;
          if (value.startsWith('optional:')) {
            isOptional = true;
            value = value.substring(9);
          }
          var isSelf = false;
          if (value.startsWith('self:')) {
            isSelf = true;
            value = value.substring(5);
          }
          var isHost = false;
          if (value.startsWith('host:')) {
            isHost = true;
            value = value.substring(5);
          }
          return new CompileDiDependencyMetadata(
              {token: createToken(value), isOptional: isOptional, isSelf: isSelf, isHost: isHost});
        }

        function createProvider(
            token: string, {multi = false, deps = /*@ts2dart_const*/[]}:
                               {multi?: boolean, deps?: string[]} = {}): CompileProviderMetadata {
          return new CompileProviderMetadata({
            token: createToken(token),
            multi: multi,
            useClass: new CompileTypeMetadata({name: `provider${nextProviderId++}`}),
            deps: deps.map(createDep)
          });
        }

        function createDir(
            selector: string, {providers = null, viewProviders = null, deps = /*@ts2dart_const*/[],
                               queries = /*@ts2dart_const*/[]}: {
              providers?: CompileProviderMetadata[],
              viewProviders?: CompileProviderMetadata[],
              deps?: string[],
              queries?: string[]
            } = {}): CompileDirectiveMetadata {
          var isComponent = !selector.startsWith('[');
          return CompileDirectiveMetadata.create({
            selector: selector,
            type: new CompileTypeMetadata(
                {moduleUrl: someModuleUrl, name: selector, diDeps: deps.map(createDep)}),
            isComponent: isComponent,
            template: new CompileTemplateMetadata({ngContentSelectors: []}),
            providers: providers,
            viewProviders: viewProviders,
            queries: queries.map(
                (value) => new CompileQueryMetadata({selectors: [createToken(value)]}))
          });
        }

        beforeEach(() => { nextProviderId = 0; });

        it('should provide a component', () => {
          var comp = createDir('my-comp');
          var elAst: ElementAst = <ElementAst>parse('<my-comp>', [comp])[0];
          expect(elAst.providers.length).toBe(1);
          expect(elAst.providers[0].providerType).toBe(ProviderAstType.Component);
          expect(elAst.providers[0].providers[0].useClass).toBe(comp.type);
        });

        it('should provide a directive', () => {
          var dirA = createDir('[dirA]');
          var elAst: ElementAst = <ElementAst>parse('<div dirA>', [dirA])[0];
          expect(elAst.providers.length).toBe(1);
          expect(elAst.providers[0].providerType).toBe(ProviderAstType.Directive);
          expect(elAst.providers[0].providers[0].useClass).toBe(dirA.type);
        });

        it('should use the public providers of a directive', () => {
          var provider = createProvider('service');
          var dirA = createDir('[dirA]', {providers: [provider]});
          var elAst: ElementAst = <ElementAst>parse('<div dirA>', [dirA])[0];
          expect(elAst.providers.length).toBe(2);
          expect(elAst.providers[1].providerType).toBe(ProviderAstType.PublicService);
          expect(elAst.providers[1].providers).toEqual([provider]);
        });

        it('should use the private providers of a component', () => {
          var provider = createProvider('service');
          var comp = createDir('my-comp', {viewProviders: [provider]});
          var elAst: ElementAst = <ElementAst>parse('<my-comp>', [comp])[0];
          expect(elAst.providers.length).toBe(2);
          expect(elAst.providers[1].providerType).toBe(ProviderAstType.PrivateService);
          expect(elAst.providers[1].providers).toEqual([provider]);
        });

        it('should support multi providers', () => {
          var provider0 = createProvider('service0', {multi: true});
          var provider1 = createProvider('service1', {multi: true});
          var provider2 = createProvider('service0', {multi: true});
          var dirA = createDir('[dirA]', {providers: [provider0, provider1]});
          var dirB = createDir('[dirB]', {providers: [provider2]});
          var elAst: ElementAst = <ElementAst>parse('<div dirA dirB>', [dirA, dirB])[0];
          expect(elAst.providers.length).toBe(4);
          expect(elAst.providers[2].providers).toEqual([provider0, provider2]);
          expect(elAst.providers[3].providers).toEqual([provider1]);
        });

        it('should overwrite non multi providers', () => {
          var provider1 = createProvider('service0');
          var provider2 = createProvider('service1');
          var provider3 = createProvider('service0');
          var dirA = createDir('[dirA]', {providers: [provider1, provider2]});
          var dirB = createDir('[dirB]', {providers: [provider3]});
          var elAst: ElementAst = <ElementAst>parse('<div dirA dirB>', [dirA, dirB])[0];
          expect(elAst.providers.length).toBe(4);
          expect(elAst.providers[2].providers).toEqual([provider3]);
          expect(elAst.providers[3].providers).toEqual([provider2]);
        });

        it('should overwrite component providers by directive providers', () => {
          var compProvider = createProvider('service0');
          var dirProvider = createProvider('service0');
          var comp = createDir('my-comp', {providers: [compProvider]});
          var dirA = createDir('[dirA]', {providers: [dirProvider]});
          var elAst: ElementAst = <ElementAst>parse('<my-comp dirA>', [dirA, comp])[0];
          expect(elAst.providers.length).toBe(3);
          expect(elAst.providers[2].providers).toEqual([dirProvider]);
        });

        it('should overwrite view providers by directive providers', () => {
          var viewProvider = createProvider('service0');
          var dirProvider = createProvider('service0');
          var comp = createDir('my-comp', {viewProviders: [viewProvider]});
          var dirA = createDir('[dirA]', {providers: [dirProvider]});
          var elAst: ElementAst = <ElementAst>parse('<my-comp dirA>', [dirA, comp])[0];
          expect(elAst.providers.length).toBe(3);
          expect(elAst.providers[2].providers).toEqual([dirProvider]);
        });

        it('should overwrite directives by providers', () => {
          var dirProvider = createProvider('type:my-comp');
          var comp = createDir('my-comp', {providers: [dirProvider]});
          var elAst: ElementAst = <ElementAst>parse('<my-comp>', [comp])[0];
          expect(elAst.providers.length).toBe(1);
          expect(elAst.providers[0].providers).toEqual([dirProvider]);
        });

        it('should throw if mixing multi and non multi providers', () => {
          var provider0 = createProvider('service0');
          var provider1 = createProvider('service0', {multi: true});
          var dirA = createDir('[dirA]', {providers: [provider0]});
          var dirB = createDir('[dirB]', {providers: [provider1]});
          expect(() => parse('<div dirA dirB>', [dirA, dirB]))
              .toThrowError(
                  `Template parse errors:\n` +
                  `Mixing multi and non multi provider is not possible for token service0 ("[ERROR ->]<div dirA dirB>"): TestComp@0:0`);
        });

        it('should sort providers by their DI order', () => {
          var provider0 = createProvider('service0', {deps: ['type:[dir2]']});
          var provider1 = createProvider('service1');
          var dir2 = createDir('[dir2]', {deps: ['service1']});
          var comp = createDir('my-comp', {providers: [provider0, provider1]});
          var elAst: ElementAst = <ElementAst>parse('<my-comp dir2>', [comp, dir2])[0];
          expect(elAst.providers.length).toBe(4);
          expect(elAst.providers[0].providers[0].useClass).toEqual(comp.type);
          expect(elAst.providers[1].providers).toEqual([provider1]);
          expect(elAst.providers[2].providers[0].useClass).toEqual(dir2.type);
          expect(elAst.providers[3].providers).toEqual([provider0]);
        });

        it('should sort directives by their DI order', () => {
          var dir0 = createDir('[dir0]', {deps: ['type:my-comp']});
          var dir1 = createDir('[dir1]', {deps: ['type:[dir0]']});
          var dir2 = createDir('[dir2]', {deps: ['type:[dir1]']});
          var comp = createDir('my-comp');
          var elAst: ElementAst =
              <ElementAst>parse('<my-comp dir2 dir0 dir1>', [comp, dir2, dir0, dir1])[0];
          expect(elAst.providers.length).toBe(4);
          expect(elAst.directives[0].directive).toBe(comp);
          expect(elAst.directives[1].directive).toBe(dir0);
          expect(elAst.directives[2].directive).toBe(dir1);
          expect(elAst.directives[3].directive).toBe(dir2);
        });

        it('should mark directives and dependencies of directives as eager', () => {
          var provider0 = createProvider('service0');
          var provider1 = createProvider('service1');
          var dirA = createDir('[dirA]', {providers: [provider0, provider1], deps: ['service0']});
          var elAst: ElementAst = <ElementAst>parse('<div dirA>', [dirA])[0];
          expect(elAst.providers.length).toBe(3);
          expect(elAst.providers[0].providers).toEqual([provider0]);
          expect(elAst.providers[0].eager).toBe(true);
          expect(elAst.providers[1].providers[0].useClass).toEqual(dirA.type);
          expect(elAst.providers[1].eager).toBe(true);
          expect(elAst.providers[2].providers).toEqual([provider1]);
          expect(elAst.providers[2].eager).toBe(false);
        });

        it('should mark dependencies on parent elements as eager', () => {
          var provider0 = createProvider('service0');
          var provider1 = createProvider('service1');
          var dirA = createDir('[dirA]', {providers: [provider0, provider1]});
          var dirB = createDir('[dirB]', {deps: ['service0']});
          var elAst: ElementAst =
              <ElementAst>parse('<div dirA><div dirB></div></div>', [dirA, dirB])[0];
          expect(elAst.providers.length).toBe(3);
          expect(elAst.providers[0].providers[0].useClass).toEqual(dirA.type);
          expect(elAst.providers[0].eager).toBe(true);
          expect(elAst.providers[1].providers).toEqual([provider0]);
          expect(elAst.providers[1].eager).toBe(true);
          expect(elAst.providers[2].providers).toEqual([provider1]);
          expect(elAst.providers[2].eager).toBe(false);
        });

        it('should mark queried providers as eager', () => {
          var provider0 = createProvider('service0');
          var provider1 = createProvider('service1');
          var dirA =
              createDir('[dirA]', {providers: [provider0, provider1], queries: ['service0']});
          var elAst: ElementAst = <ElementAst>parse('<div dirA></div>', [dirA])[0];
          expect(elAst.providers.length).toBe(3);
          expect(elAst.providers[0].providers[0].useClass).toEqual(dirA.type);
          expect(elAst.providers[0].eager).toBe(true);
          expect(elAst.providers[1].providers).toEqual([provider0]);
          expect(elAst.providers[1].eager).toBe(true);
          expect(elAst.providers[2].providers).toEqual([provider1]);
          expect(elAst.providers[2].eager).toBe(false);
        });

        it('should not mark dependencies accross embedded views as eager', () => {
          var provider0 = createProvider('service0');
          var dirA = createDir('[dirA]', {providers: [provider0]});
          var dirB = createDir('[dirB]', {deps: ['service0']});
          var elAst: ElementAst =
              <ElementAst>parse('<div dirA><div *ngIf dirB></div></div>', [dirA, dirB])[0];
          expect(elAst.providers.length).toBe(2);
          expect(elAst.providers[0].providers[0].useClass).toEqual(dirA.type);
          expect(elAst.providers[0].eager).toBe(true);
          expect(elAst.providers[1].providers).toEqual([provider0]);
          expect(elAst.providers[1].eager).toBe(false);
        });

        it('should report missing @Self() deps as errors', () => {
          var dirA = createDir('[dirA]', {deps: ['self:provider0']});
          expect(() => parse('<div dirA></div>', [dirA]))
              .toThrowError(
                  'Template parse errors:\nNo provider for provider0 ("[ERROR ->]<div dirA></div>"): TestComp@0:0');
        });

        it('should change missing @Self() that are optional to nulls', () => {
          var dirA = createDir('[dirA]', {deps: ['optional:self:provider0']});
          var elAst: ElementAst = <ElementAst>parse('<div dirA></div>', [dirA])[0];
          expect(elAst.providers[0].providers[0].deps[0].isValue).toBe(true);
          expect(elAst.providers[0].providers[0].deps[0].value).toBe(null);
        });

        it('should report missing @Host() deps as errors', () => {
          var dirA = createDir('[dirA]', {deps: ['host:provider0']});
          expect(() => parse('<div dirA></div>', [dirA]))
              .toThrowError(
                  'Template parse errors:\nNo provider for provider0 ("[ERROR ->]<div dirA></div>"): TestComp@0:0');
        });

        it('should change missing @Host() that are optional to nulls', () => {
          var dirA = createDir('[dirA]', {deps: ['optional:host:provider0']});
          var elAst: ElementAst = <ElementAst>parse('<div dirA></div>', [dirA])[0];
          expect(elAst.providers[0].providers[0].deps[0].isValue).toBe(true);
          expect(elAst.providers[0].providers[0].deps[0].value).toBe(null);
        });
      });

      describe('references', () => {

        it('should parse references via #... and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div #a>', [
          ]))).toEqual([[ElementAst, 'div'], [ReferenceAst, 'a', null]]);
        });

        it('should parse references via ref-... and not report them as attributes', () => {
          expect(humanizeTplAst(parse('<div ref-a>', [
          ]))).toEqual([[ElementAst, 'div'], [ReferenceAst, 'a', null]]);
        });

        it('should parse references via var-... and report them as deprecated', () => {
          expect(humanizeTplAst(parse('<div var-a>', [
          ]))).toEqual([[ElementAst, 'div'], [ReferenceAst, 'a', null]]);
          expect(console.warnings).toEqual([[
            'Template parse warnings:',
            '"var-" on non <template> elements is deprecated. Use "ref-" instead! ("<div [ERROR ->]var-a>"): TestComp@0:5'
          ].join('\n')]);
        });

        it('should parse camel case references', () => {
          expect(humanizeTplAst(parse('<div ref-someA>', [
          ]))).toEqual([[ElementAst, 'div'], [ReferenceAst, 'someA', null]]);
        });

        it('should assign references with empty value to the element', () => {
          expect(humanizeTplAst(parse('<div #a></div>', [
          ]))).toEqual([[ElementAst, 'div'], [ReferenceAst, 'a', null]]);
        });

        it('should assign references to directives via exportAs', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: '[a]',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            exportAs: 'dirA'
          });
          expect(humanizeTplAst(parse('<div a #a="dirA"></div>', [dirA]))).toEqual([
            [ElementAst, 'div'],
            [AttrAst, 'a', ''],
            [ReferenceAst, 'a', identifierToken(dirA.type)],
            [DirectiveAst, dirA],
          ]);
        });

        it('should report references with values that dont match a directive as errors', () => {
          expect(() => parse('<div #a="dirA"></div>', [])).toThrowError(`Template parse errors:
There is no directive with "exportAs" set to "dirA" ("<div [ERROR ->]#a="dirA"></div>"): TestComp@0:5`);
        });

        it('should report invalid reference names', () => {
          expect(() => parse('<div #a-b></div>', [])).toThrowError(`Template parse errors:
"-" is not allowed in reference names ("<div [ERROR ->]#a-b></div>"): TestComp@0:5`);
        });

        it('should report variables as errors', () => {
          expect(() => parse('<div let-a></div>', [])).toThrowError(`Template parse errors:
"let-" is only supported on template elements. ("<div [ERROR ->]let-a></div>"): TestComp@0:5`);
        });

        it('should report duplicate reference names', () => {
          expect(() => parse('<div #a></div><div #a></div>', []))
              .toThrowError(`Template parse errors:
Reference "#a" is defined several times ("<div #a></div><div [ERROR ->]#a></div>"): TestComp@0:19`);

        });

        it('should not throw error when there is same reference name in different templates',
           () => {
             expect(() => parse('<div #a><template #a><span>OK</span></template></div>', []))
                 .not.toThrowError();

           });

        it('should assign references with empty value to components', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: '[a]',
            isComponent: true,
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
            exportAs: 'dirA',
            template: new CompileTemplateMetadata({ngContentSelectors: []})
          });
          expect(humanizeTplAst(parse('<div a #a></div>', [dirA]))).toEqual([
            [ElementAst, 'div'],
            [AttrAst, 'a', ''],
            [ReferenceAst, 'a', identifierToken(dirA.type)],
            [DirectiveAst, dirA],
          ]);
        });

        it('should not locate directives in references', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: '[a]',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
          });
          expect(humanizeTplAst(parse('<div ref-a>', [dirA]))).toEqual([
            [ElementAst, 'div'], [ReferenceAst, 'a', null]
          ]);
        });
      });

      describe('explicit templates', () => {
        it('should create embedded templates for <template> elements', () => {
          expect(humanizeTplAst(parse('<template></template>', [
          ]))).toEqual([[EmbeddedTemplateAst]]);
          expect(humanizeTplAst(parse('<TEMPLATE></TEMPLATE>', [
          ]))).toEqual([[EmbeddedTemplateAst]]);
        });

        it('should create embedded templates for <template> elements regardless the namespace',
           () => {
             expect(humanizeTplAst(parse('<svg><template></template></svg>', []))).toEqual([
               [ElementAst, ':svg:svg'],
               [EmbeddedTemplateAst],
             ]);
           });

        it('should support references via #...', () => {
          expect(humanizeTplAst(parse('<template #a>', []))).toEqual([
            [EmbeddedTemplateAst], [ReferenceAst, 'a', identifierToken(Identifiers.TemplateRef)]
          ]);
        });

        it('should support references via ref-...', () => {
          expect(humanizeTplAst(parse('<template ref-a>', []))).toEqual([
            [EmbeddedTemplateAst], [ReferenceAst, 'a', identifierToken(Identifiers.TemplateRef)]
          ]);
        });

        it('should parse variables via let-...', () => {
          expect(humanizeTplAst(parse('<template let-a="b">', [
          ]))).toEqual([[EmbeddedTemplateAst], [VariableAst, 'a', 'b']]);
        });

        it('should parse variables via var-... and report them as deprecated', () => {
          expect(humanizeTplAst(parse('<template var-a="b">', [
          ]))).toEqual([[EmbeddedTemplateAst], [VariableAst, 'a', 'b']]);
          expect(console.warnings).toEqual([[
            'Template parse warnings:',
            '"var-" on <template> elements is deprecated. Use "let-" instead! ("<template [ERROR ->]var-a="b">"): TestComp@0:10'
          ].join('\n')]);
        });

        it('should not locate directives in variables', () => {
          var dirA = CompileDirectiveMetadata.create({
            selector: '[a]',
            type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
          });
          expect(humanizeTplAst(parse('<template let-a="b"></template>', [dirA]))).toEqual([
            [EmbeddedTemplateAst], [VariableAst, 'a', 'b']
          ]);
        });

      });

      describe('inline templates', () => {
        it('should wrap the element into an EmbeddedTemplateAST', () => {
          expect(humanizeTplAst(parse('<div template>', [
          ]))).toEqual([[EmbeddedTemplateAst], [ElementAst, 'div']]);
        });

        it('should wrap the element with data-template attribute into an EmbeddedTemplateAST ',
           () => {
             expect(humanizeTplAst(parse('<div data-template>', [
             ]))).toEqual([[EmbeddedTemplateAst], [ElementAst, 'div']]);
           });

        it('should parse bound properties', () => {
          expect(humanizeTplAst(parse('<div template="ngIf test">', [ngIf]))).toEqual([
            [EmbeddedTemplateAst], [DirectiveAst, ngIf],
            [BoundDirectivePropertyAst, 'ngIf', 'test'], [ElementAst, 'div']
          ]);
        });

        it('should parse variables via #... and report them as deprecated', () => {
          expect(humanizeTplAst(parse('<div *ngIf="#a=b">', [
          ]))).toEqual([[EmbeddedTemplateAst], [VariableAst, 'a', 'b'], [ElementAst, 'div']]);
          expect(console.warnings).toEqual([[
            'Template parse warnings:',
            '"#" inside of expressions is deprecated. Use "let" instead! ("<div [ERROR ->]*ngIf="#a=b">"): TestComp@0:5'
          ].join('\n')]);
        });

        it('should parse variables via var ... and report them as deprecated', () => {
          expect(humanizeTplAst(parse('<div *ngIf="var a=b">', [
          ]))).toEqual([[EmbeddedTemplateAst], [VariableAst, 'a', 'b'], [ElementAst, 'div']]);
          expect(console.warnings).toEqual([[
            'Template parse warnings:',
            '"var" inside of expressions is deprecated. Use "let" instead! ("<div [ERROR ->]*ngIf="var a=b">"): TestComp@0:5'
          ].join('\n')]);
        });

        it('should parse variables via let ...', () => {
          expect(humanizeTplAst(parse('<div *ngIf="let a=b">', [
          ]))).toEqual([[EmbeddedTemplateAst], [VariableAst, 'a', 'b'], [ElementAst, 'div']]);
        });

        describe('directives', () => {
          it('should locate directives in property bindings', () => {
            var dirA = CompileDirectiveMetadata.create({
              selector: '[a=b]',
              type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
              inputs: ['a']
            });
            var dirB = CompileDirectiveMetadata.create({
              selector: '[b]',
              type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirB'})
            });
            expect(humanizeTplAst(parse('<div template="a b" b>', [dirA, dirB]))).toEqual([
              [EmbeddedTemplateAst], [DirectiveAst, dirA], [BoundDirectivePropertyAst, 'a', 'b'],
              [ElementAst, 'div'], [AttrAst, 'b', ''], [DirectiveAst, dirB]
            ]);
          });

          it('should not locate directives in variables', () => {
            var dirA = CompileDirectiveMetadata.create({
              selector: '[a]',
              type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
            });
            expect(humanizeTplAst(parse('<div template="let a=b">', [dirA]))).toEqual([
              [EmbeddedTemplateAst], [VariableAst, 'a', 'b'], [ElementAst, 'div']
            ]);
          });

          it('should not locate directives in references', () => {
            var dirA = CompileDirectiveMetadata.create({
              selector: '[a]',
              type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
            });
            expect(humanizeTplAst(parse('<div ref-a>', [dirA]))).toEqual([
              [ElementAst, 'div'], [ReferenceAst, 'a', null]
            ]);
          });

        });

        it('should work with *... and use the attribute name as property binding name', () => {
          expect(humanizeTplAst(parse('<div *ngIf="test">', [ngIf]))).toEqual([
            [EmbeddedTemplateAst], [DirectiveAst, ngIf],
            [BoundDirectivePropertyAst, 'ngIf', 'test'], [ElementAst, 'div']
          ]);
        });

        it('should work with *... and empty value', () => {
          expect(humanizeTplAst(parse('<div *ngIf>', [ngIf]))).toEqual([
            [EmbeddedTemplateAst], [DirectiveAst, ngIf],
            [BoundDirectivePropertyAst, 'ngIf', 'null'], [ElementAst, 'div']
          ]);
        });
      });
    });

    describe('content projection', () => {
      var compCounter: any /** TODO #9100 */;
      beforeEach(() => { compCounter = 0; });

      function createComp(
          selector: string, ngContentSelectors: string[]): CompileDirectiveMetadata {
        return CompileDirectiveMetadata.create({
          selector: selector,
          isComponent: true,
          type:
              new CompileTypeMetadata({moduleUrl: someModuleUrl, name: `SomeComp${compCounter++}`}),
          template: new CompileTemplateMetadata({ngContentSelectors: ngContentSelectors})
        });
      }

      function createDir(selector: string): CompileDirectiveMetadata {
        return CompileDirectiveMetadata.create({
          selector: selector,
          type: new CompileTypeMetadata(
              {moduleUrl: someModuleUrl, name: `SomeDir${compCounter++}`})
        });
      }

      describe('project text nodes', () => {
        it('should project text nodes with wildcard selector', () => {
          expect(humanizeContentProjection(parse('<div>hello</div>', [createComp('div', ['*'])])))
              .toEqual([['div', null], ['#text(hello)', 0]]);
        });
      });

      describe('project elements', () => {
        it('should project elements with wildcard selector', () => {
          expect(humanizeContentProjection(parse('<div><span></span></div>', [
            createComp('div', ['*'])
          ]))).toEqual([['div', null], ['span', 0]]);
        });

        it('should project elements with css selector', () => {
          expect(humanizeContentProjection(parse('<div><a x></a><b></b></div>', [
            createComp('div', ['a[x]'])
          ]))).toEqual([['div', null], ['a', 0], ['b', null]]);
        });
      });

      describe('embedded templates', () => {
        it('should project embedded templates with wildcard selector', () => {
          expect(humanizeContentProjection(parse('<div><template></template></div>', [
            createComp('div', ['*'])
          ]))).toEqual([['div', null], ['template', 0]]);
        });

        it('should project embedded templates with css selector', () => {
          expect(humanizeContentProjection(parse(
                     '<div><template x></template><template></template></div>',
                     [createComp('div', ['template[x]'])])))
              .toEqual([['div', null], ['template', 0], ['template', null]]);
        });
      });

      describe('ng-content', () => {
        it('should project ng-content with wildcard selector', () => {
          expect(humanizeContentProjection(parse('<div><ng-content></ng-content></div>', [
            createComp('div', ['*'])
          ]))).toEqual([['div', null], ['ng-content', 0]]);
        });

        it('should project ng-content with css selector', () => {
          expect(humanizeContentProjection(parse(
                     '<div><ng-content x></ng-content><ng-content></ng-content></div>',
                     [createComp('div', ['ng-content[x]'])])))
              .toEqual([['div', null], ['ng-content', 0], ['ng-content', null]]);
        });
      });

      it('should project into the first matching ng-content', () => {
        expect(humanizeContentProjection(parse('<div>hello<b></b><a></a></div>', [
          createComp('div', ['a', 'b', '*'])
        ]))).toEqual([['div', null], ['#text(hello)', 2], ['b', 1], ['a', 0]]);
      });

      it('should project into wildcard ng-content last', () => {
        expect(humanizeContentProjection(parse('<div>hello<a></a></div>', [
          createComp('div', ['*', 'a'])
        ]))).toEqual([['div', null], ['#text(hello)', 0], ['a', 1]]);
      });

      it('should only project direct child nodes', () => {
        expect(humanizeContentProjection(parse('<div><span><a></a></span><a></a></div>', [
          createComp('div', ['a'])
        ]))).toEqual([['div', null], ['span', null], ['a', null], ['a', 0]]);
      });

      it('should project nodes of nested components', () => {
        expect(humanizeContentProjection(parse('<a><b>hello</b></a>', [
          createComp('a', ['*']), createComp('b', ['*'])
        ]))).toEqual([['a', null], ['b', 0], ['#text(hello)', 0]]);
      });

      it('should project children of components with ngNonBindable', () => {
        expect(humanizeContentProjection(parse('<div ngNonBindable>{{hello}}<span></span></div>', [
          createComp('div', ['*'])
        ]))).toEqual([['div', null], ['#text({{hello}})', 0], ['span', 0]]);
      });

      it('should match the element when there is an inline template', () => {
        expect(humanizeContentProjection(parse('<div><b *ngIf="cond"></b></div>', [
          createComp('div', ['a', 'b']), ngIf
        ]))).toEqual([['div', null], ['template', 1], ['b', null]]);
      });

      describe('ngProjectAs', () => {
        it('should override elements', () => {
          expect(humanizeContentProjection(parse('<div><a ngProjectAs="b"></a></div>', [
            createComp('div', ['a', 'b'])
          ]))).toEqual([['div', null], ['a', 1]]);
        });

        it('should override <ng-content>', () => {
          expect(humanizeContentProjection(parse(
                     '<div><ng-content ngProjectAs="b"></ng-content></div>',
                     [createComp('div', ['ng-content', 'b'])])))
              .toEqual([['div', null], ['ng-content', 1]]);
        });

        it('should override <template>', () => {
          expect(humanizeContentProjection(parse(
                     '<div><template ngProjectAs="b"></template></div>',
                     [createComp('div', ['template', 'b'])])))
              .toEqual([['div', null], ['template', 1]]);
        });

        it('should override inline templates', () => {
          expect(humanizeContentProjection(parse(
                     '<div><a *ngIf="cond" ngProjectAs="b"></a></div>',
                     [createComp('div', ['a', 'b']), ngIf])))
              .toEqual([['div', null], ['template', 1], ['a', null]]);
        });
      });

      it('should support other directives before the component', () => {
        expect(humanizeContentProjection(parse('<div>hello</div>', [
          createDir('div'), createComp('div', ['*'])
        ]))).toEqual([['div', null], ['#text(hello)', 0]]);
      });
    });

    describe('splitClasses', () => {
      it('should keep an empty class', () => { expect(splitClasses('a')).toEqual(['a']); });

      it('should split 2 classes', () => { expect(splitClasses('a b')).toEqual(['a', 'b']); });

      it('should trim classes', () => { expect(splitClasses(' a  b ')).toEqual(['a', 'b']); });
    });

    describe('error cases', () => {
      it('should report when ng-content has content', () => {
        expect(() => parse('<ng-content>content</ng-content>', []))
            .toThrowError(`Template parse errors:
<ng-content> element cannot have content. <ng-content> must be immediately followed by </ng-content> ("[ERROR ->]<ng-content>content</ng-content>"): TestComp@0:0`);
      });

      it('should treat *attr on a template element as valid',
         () => { expect(() => parse('<template *ngIf>', [])).not.toThrowError(); });

      it('should treat template attribute on a template element as valid',
         () => { expect(() => parse('<template template="ngIf">', [])).not.toThrowError(); });

      it('should report when mutliple *attrs are used on the same element', () => {
        expect(() => parse('<div *ngIf *ngFor>', [])).toThrowError(`Template parse errors:
Can't have multiple template bindings on one element. Use only one attribute named 'template' or prefixed with * ("<div *ngIf [ERROR ->]*ngFor>"): TestComp@0:11`);
      });

      it('should report when mix of template and *attrs are used on the same element', () => {
        expect(() => parse('<div template="ngIf" *ngFor>', [])).toThrowError(`Template parse errors:
Can't have multiple template bindings on one element. Use only one attribute named 'template' or prefixed with * ("<div template="ngIf" [ERROR ->]*ngFor>"): TestComp@0:21`);
      });

      it('should report invalid property names', () => {
        expect(() => parse('<div [invalidProp]></div>', [])).toThrowError(`Template parse errors:
Can't bind to 'invalidProp' since it isn't a known native property ("<div [ERROR ->][invalidProp]></div>"): TestComp@0:5`);
      });

      it('should report invalid host property names', () => {
        var dirA = CompileDirectiveMetadata.create({
          selector: 'div',
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
          host: {'[invalidProp]': 'someProp'}
        });
        expect(() => parse('<div></div>', [dirA])).toThrowError(`Template parse errors:
Can't bind to 'invalidProp' since it isn't a known native property ("[ERROR ->]<div></div>"): TestComp@0:0, Directive DirA`);
      });

      it('should report errors in expressions', () => {
        expect(() => parse('<div [prop]="a b"></div>', [])).toThrowError(`Template parse errors:
Parser Error: Unexpected token 'b' at column 3 in [a b] in TestComp@0:5 ("<div [ERROR ->][prop]="a b"></div>"): TestComp@0:5`);
      });

      it('should not throw on invalid property names if the property is used by a directive',
         () => {
           var dirA = CompileDirectiveMetadata.create({
             selector: 'div',
             type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
             inputs: ['invalidProp']
           });
           expect(() => parse('<div [invalid-prop]></div>', [dirA])).not.toThrow();
         });

      it('should not allow more than 1 component per element', () => {
        var dirA = CompileDirectiveMetadata.create({
          selector: 'div',
          isComponent: true,
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
          template: new CompileTemplateMetadata({ngContentSelectors: []})
        });
        var dirB = CompileDirectiveMetadata.create({
          selector: 'div',
          isComponent: true,
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirB'}),
          template: new CompileTemplateMetadata({ngContentSelectors: []})
        });
        expect(() => parse('<div>', [dirB, dirA])).toThrowError(`Template parse errors:
More than one component: DirB,DirA ("[ERROR ->]<div>"): TestComp@0:0`);
      });

      it('should not allow components or element bindings nor dom events on explicit embedded templates',
         () => {
           var dirA = CompileDirectiveMetadata.create({
             selector: '[a]',
             isComponent: true,
             type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
             template: new CompileTemplateMetadata({ngContentSelectors: []})
           });
           expect(() => parse('<template [a]="b" (e)="f"></template>', [dirA]))
               .toThrowError(`Template parse errors:
Event binding e not emitted by any directive on an embedded template. Make sure that the event name is spelled correctly and all directives are listed in the "directives" section. ("<template [a]="b" [ERROR ->](e)="f"></template>"): TestComp@0:18
Components on an embedded template: DirA ("[ERROR ->]<template [a]="b" (e)="f"></template>"): TestComp@0:0
Property binding a not used by any directive on an embedded template. Make sure that the property name is spelled correctly and all directives are listed in the "directives" section. ("[ERROR ->]<template [a]="b" (e)="f"></template>"): TestComp@0:0`);
         });

      it('should not allow components or element bindings on inline embedded templates', () => {
        var dirA = CompileDirectiveMetadata.create({
          selector: '[a]',
          isComponent: true,
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
          template: new CompileTemplateMetadata({ngContentSelectors: []})
        });
        expect(() => parse('<div *a="b"></div>', [dirA])).toThrowError(`Template parse errors:
Components on an embedded template: DirA ("[ERROR ->]<div *a="b"></div>"): TestComp@0:0
Property binding a not used by any directive on an embedded template. Make sure that the property name is spelled correctly and all directives are listed in the "directives" section. ("[ERROR ->]<div *a="b"></div>"): TestComp@0:0`);
      });
    });

    describe('ignore elements', () => {
      it('should ignore <script> elements', () => {
        expect(humanizeTplAst(parse('<script></script>a', []))).toEqual([[TextAst, 'a']]);

      });

      it('should ignore <style> elements', () => {
        expect(humanizeTplAst(parse('<style></style>a', []))).toEqual([[TextAst, 'a']]);
      });

      describe('<link rel="stylesheet">', () => {

        it('should keep <link rel="stylesheet"> elements if they have an absolute non package: url',
           () => {
             expect(humanizeTplAst(parse('<link rel="stylesheet" href="http://someurl">a', [])))
                 .toEqual([
                   [ElementAst, 'link'], [AttrAst, 'rel', 'stylesheet'],
                   [AttrAst, 'href', 'http://someurl'], [TextAst, 'a']
                 ]);
           });

        it('should keep <link rel="stylesheet"> elements if they have no uri', () => {
          expect(humanizeTplAst(parse('<link rel="stylesheet">a', [
          ]))).toEqual([[ElementAst, 'link'], [AttrAst, 'rel', 'stylesheet'], [TextAst, 'a']]);
          expect(humanizeTplAst(parse('<link REL="stylesheet">a', [
          ]))).toEqual([[ElementAst, 'link'], [AttrAst, 'REL', 'stylesheet'], [TextAst, 'a']]);
        });

        it('should ignore <link rel="stylesheet"> elements if they have a relative uri', () => {
          expect(humanizeTplAst(parse('<link rel="stylesheet" href="./other.css">a', [
          ]))).toEqual([[TextAst, 'a']]);
          expect(humanizeTplAst(parse('<link rel="stylesheet" HREF="./other.css">a', [
          ]))).toEqual([[TextAst, 'a']]);
        });

        it('should ignore <link rel="stylesheet"> elements if they have a package: uri', () => {
          expect(humanizeTplAst(parse('<link rel="stylesheet" href="package:somePackage">a', [
          ]))).toEqual([[TextAst, 'a']]);
        });

      });

      it('should ignore bindings on children of elements with ngNonBindable', () => {
        expect(humanizeTplAst(parse('<div ngNonBindable>{{b}}</div>', [
        ]))).toEqual([[ElementAst, 'div'], [AttrAst, 'ngNonBindable', ''], [TextAst, '{{b}}']]);
      });

      it('should keep nested children of elements with ngNonBindable', () => {
        expect(humanizeTplAst(parse('<div ngNonBindable><span>{{b}}</span></div>', []))).toEqual([
          [ElementAst, 'div'], [AttrAst, 'ngNonBindable', ''], [ElementAst, 'span'],
          [TextAst, '{{b}}']
        ]);
      });

      it('should ignore <script> elements inside of elements with ngNonBindable', () => {
        expect(humanizeTplAst(parse('<div ngNonBindable><script></script>a</div>', [
        ]))).toEqual([[ElementAst, 'div'], [AttrAst, 'ngNonBindable', ''], [TextAst, 'a']]);
      });

      it('should ignore <style> elements inside of elements with ngNonBindable', () => {
        expect(humanizeTplAst(parse('<div ngNonBindable><style></style>a</div>', [
        ]))).toEqual([[ElementAst, 'div'], [AttrAst, 'ngNonBindable', ''], [TextAst, 'a']]);
      });

      it('should ignore <link rel="stylesheet"> elements inside of elements with ngNonBindable',
         () => {
           expect(humanizeTplAst(parse('<div ngNonBindable><link rel="stylesheet">a</div>', [
           ]))).toEqual([[ElementAst, 'div'], [AttrAst, 'ngNonBindable', ''], [TextAst, 'a']]);
         });

      it('should convert <ng-content> elements into regular elements inside of elements with ngNonBindable',
         () => {
           expect(humanizeTplAst(parse('<div ngNonBindable><ng-content></ng-content>a</div>', [])))
               .toEqual([
                 [ElementAst, 'div'], [AttrAst, 'ngNonBindable', ''], [ElementAst, 'ng-content'],
                 [TextAst, 'a']
               ]);
         });

    });

    describe('source spans', () => {
      it('should support ng-content', () => {
        var parsed = parse('<ng-content select="a">', []);
        expect(humanizeTplAstSourceSpans(parsed)).toEqual([
          [NgContentAst, '<ng-content select="a">']
        ]);
      });

      it('should support embedded template', () => {
        expect(humanizeTplAstSourceSpans(parse('<template></template>', [
        ]))).toEqual([[EmbeddedTemplateAst, '<template>']]);

      });

      it('should support element and attributes', () => {
        expect(humanizeTplAstSourceSpans(parse('<div key=value>', []))).toEqual([
          [ElementAst, 'div', '<div key=value>'], [AttrAst, 'key', 'value', 'key=value']
        ]);

      });

      it('should support references', () => {
        expect(humanizeTplAstSourceSpans(parse('<div #a></div>', [
        ]))).toEqual([[ElementAst, 'div', '<div #a>'], [ReferenceAst, 'a', null, '#a']]);
      });

      it('should support variables', () => {
        expect(humanizeTplAstSourceSpans(parse('<template let-a="b"></template>', []))).toEqual([
          [EmbeddedTemplateAst, '<template let-a="b">'], [VariableAst, 'a', 'b', 'let-a="b"']
        ]);
      });

      it('should support events', () => {
        expect(humanizeTplAstSourceSpans(parse('<div (window:event)="v">', []))).toEqual([
          [ElementAst, 'div', '<div (window:event)="v">'],
          [BoundEventAst, 'event', 'window', 'v', '(window:event)="v"']
        ]);

      });

      it('should support element property', () => {
        expect(humanizeTplAstSourceSpans(parse('<div [someProp]="v">', []))).toEqual([
          [ElementAst, 'div', '<div [someProp]="v">'],
          [
            BoundElementPropertyAst, PropertyBindingType.Property, 'someProp', 'v', null,
            '[someProp]="v"'
          ]
        ]);
      });

      it('should support bound text', () => {
        expect(humanizeTplAstSourceSpans(parse('{{a}}', [
        ]))).toEqual([[BoundTextAst, '{{ a }}', '{{a}}']]);
      });

      it('should support text nodes', () => {
        expect(humanizeTplAstSourceSpans(parse('a', []))).toEqual([[TextAst, 'a', 'a']]);
      });

      it('should support directive', () => {
        var dirA = CompileDirectiveMetadata.create({
          selector: '[a]',
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
        });
        var comp = CompileDirectiveMetadata.create({
          selector: 'div',
          isComponent: true,
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'ZComp'}),
          template: new CompileTemplateMetadata({ngContentSelectors: []})
        });
        expect(humanizeTplAstSourceSpans(parse('<div a>', [dirA, comp]))).toEqual([
          [ElementAst, 'div', '<div a>'], [AttrAst, 'a', '', 'a'], [DirectiveAst, dirA, '<div a>'],
          [DirectiveAst, comp, '<div a>']
        ]);
      });

      it('should support directive in namespace', () => {
        var tagSel = CompileDirectiveMetadata.create({
          selector: 'circle',
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'elDir'})
        });
        var attrSel = CompileDirectiveMetadata.create({
          selector: '[href]',
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'attrDir'})
        });

        expect(humanizeTplAstSourceSpans(
                   parse('<svg><circle /><use xlink:href="Port" /></svg>', [tagSel, attrSel])))
            .toEqual([
              [ElementAst, ':svg:svg', '<svg>'],
              [ElementAst, ':svg:circle', '<circle />'],
              [DirectiveAst, tagSel, '<circle />'],
              [ElementAst, ':svg:use', '<use xlink:href="Port" />'],
              [AttrAst, ':xlink:href', 'Port', 'xlink:href="Port"'],
              [DirectiveAst, attrSel, '<use xlink:href="Port" />'],
            ]);
      });

      it('should support directive property', () => {
        var dirA = CompileDirectiveMetadata.create({
          selector: 'div',
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'}),
          inputs: ['aProp']
        });
        expect(humanizeTplAstSourceSpans(parse('<div [aProp]="foo"></div>', [dirA]))).toEqual([
          [ElementAst, 'div', '<div [aProp]="foo">'], [DirectiveAst, dirA, '<div [aProp]="foo">'],
          [BoundDirectivePropertyAst, 'aProp', 'foo', '[aProp]="foo"']
        ]);
      });

    });

    describe('pipes', () => {
      it('should allow pipes that have been defined as dependencies', () => {
        var testPipe = new CompilePipeMetadata({
          name: 'test',
          type: new CompileTypeMetadata({moduleUrl: someModuleUrl, name: 'DirA'})
        });
        expect(() => parse('{{a | test}}', [], [testPipe])).not.toThrow();
      });

      it('should report pipes as error that have not been defined as dependencies', () => {
        expect(() => parse('{{a | test}}', [])).toThrowError(`Template parse errors:
The pipe 'test' could not be found ("[ERROR ->]{{a | test}}"): TestComp@0:0`);
      });

    });

    describe('ICU messages', () => {
      it('should expand plural messages', () => {
        const shortForm = '{ count, plural, =0 {small} many {big} }';
        const expandedForm = '<ng-container [ngPlural]="count">' +
            '<template ngPluralCase="=0">small</template>' +
            '<template ngPluralCase="many">big</template>' +
            '</ng-container>';

        expect(humanizeTplAst(parse(shortForm, []))).toEqual(humanizeTplAst(parse(expandedForm, [
        ])));
      });

      it('should expand other messages', () => {
        const shortForm = '{ sex, gender, =f {foo} other {bar} }';
        const expandedForm = '<ng-container [ngSwitch]="sex">' +
            '<template ngSwitchCase="=f">foo</template>' +
            '<template ngSwitchCase="other">bar</template>' +
            '</ng-container>';

        expect(humanizeTplAst(parse(shortForm, []))).toEqual(humanizeTplAst(parse(expandedForm, [
        ])));
      });

      it('should be possible to escape ICU messages', () => {
        const escapedForm = 'escaped {{ "{" }}  }';

        expect(humanizeTplAst(parse(escapedForm, []))).toEqual([
          [BoundTextAst, 'escaped {{ "{" }}  }'],
        ]);
      });
    });
  });
}

function humanizeTplAst(
    templateAsts: TemplateAst[], interpolationConfig?: InterpolationConfig): any[] {
  const humanizer = new TemplateHumanizer(false, interpolationConfig);
  templateVisitAll(humanizer, templateAsts);
  return humanizer.result;
}

function humanizeTplAstSourceSpans(
    templateAsts: TemplateAst[], interpolationConfig?: InterpolationConfig): any[] {
  const humanizer = new TemplateHumanizer(true, interpolationConfig);
  templateVisitAll(humanizer, templateAsts);
  return humanizer.result;
}

class TemplateHumanizer implements TemplateAstVisitor {
  result: any[] = [];

  constructor(
      private includeSourceSpan: boolean,
      private interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG){};

  visitNgContent(ast: NgContentAst, context: any): any {
    var res = [NgContentAst];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitEmbeddedTemplate(ast: EmbeddedTemplateAst, context: any): any {
    var res = [EmbeddedTemplateAst];
    this.result.push(this._appendContext(ast, res));
    templateVisitAll(this, ast.attrs);
    templateVisitAll(this, ast.outputs);
    templateVisitAll(this, ast.references);
    templateVisitAll(this, ast.variables);
    templateVisitAll(this, ast.directives);
    templateVisitAll(this, ast.children);
    return null;
  }
  visitElement(ast: ElementAst, context: any): any {
    var res = [ElementAst, ast.name];
    this.result.push(this._appendContext(ast, res));
    templateVisitAll(this, ast.attrs);
    templateVisitAll(this, ast.inputs);
    templateVisitAll(this, ast.outputs);
    templateVisitAll(this, ast.references);
    templateVisitAll(this, ast.directives);
    templateVisitAll(this, ast.children);
    return null;
  }
  visitReference(ast: ReferenceAst, context: any): any {
    var res = [ReferenceAst, ast.name, ast.value];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitVariable(ast: VariableAst, context: any): any {
    var res = [VariableAst, ast.name, ast.value];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitEvent(ast: BoundEventAst, context: any): any {
    var res = [BoundEventAst, ast.name, ast.target, unparse(ast.handler, this.interpolationConfig)];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitElementProperty(ast: BoundElementPropertyAst, context: any): any {
    var res = [
      BoundElementPropertyAst, ast.type, ast.name, unparse(ast.value, this.interpolationConfig),
      ast.unit
    ];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitAttr(ast: AttrAst, context: any): any {
    var res = [AttrAst, ast.name, ast.value];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitBoundText(ast: BoundTextAst, context: any): any {
    var res = [BoundTextAst, unparse(ast.value, this.interpolationConfig)];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitText(ast: TextAst, context: any): any {
    var res = [TextAst, ast.value];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitDirective(ast: DirectiveAst, context: any): any {
    var res = [DirectiveAst, ast.directive];
    this.result.push(this._appendContext(ast, res));
    templateVisitAll(this, ast.inputs);
    templateVisitAll(this, ast.hostProperties);
    templateVisitAll(this, ast.hostEvents);
    return null;
  }
  visitDirectiveProperty(ast: BoundDirectivePropertyAst, context: any): any {
    var res = [
      BoundDirectivePropertyAst, ast.directiveName, unparse(ast.value, this.interpolationConfig)
    ];
    this.result.push(this._appendContext(ast, res));
    return null;
  }

  private _appendContext(ast: TemplateAst, input: any[]): any[] {
    if (!this.includeSourceSpan) return input;
    input.push(ast.sourceSpan.toString());
    return input;
  }
}

function sourceInfo(ast: TemplateAst): string {
  return `${ast.sourceSpan}: ${ast.sourceSpan.start}`;
}

function humanizeContentProjection(templateAsts: TemplateAst[]): any[] {
  var humanizer = new TemplateContentProjectionHumanizer();
  templateVisitAll(humanizer, templateAsts);
  return humanizer.result;
}

class TemplateContentProjectionHumanizer implements TemplateAstVisitor {
  result: any[] = [];
  visitNgContent(ast: NgContentAst, context: any): any {
    this.result.push(['ng-content', ast.ngContentIndex]);
    return null;
  }
  visitEmbeddedTemplate(ast: EmbeddedTemplateAst, context: any): any {
    this.result.push(['template', ast.ngContentIndex]);
    templateVisitAll(this, ast.children);
    return null;
  }
  visitElement(ast: ElementAst, context: any): any {
    this.result.push([ast.name, ast.ngContentIndex]);
    templateVisitAll(this, ast.children);
    return null;
  }
  visitReference(ast: ReferenceAst, context: any): any { return null; }
  visitVariable(ast: VariableAst, context: any): any { return null; }
  visitEvent(ast: BoundEventAst, context: any): any { return null; }
  visitElementProperty(ast: BoundElementPropertyAst, context: any): any { return null; }
  visitAttr(ast: AttrAst, context: any): any { return null; }
  visitBoundText(ast: BoundTextAst, context: any): any {
    this.result.push([`#text(${unparse(ast.value)})`, ast.ngContentIndex]);
    return null;
  }
  visitText(ast: TextAst, context: any): any {
    this.result.push([`#text(${ast.value})`, ast.ngContentIndex]);
    return null;
  }
  visitDirective(ast: DirectiveAst, context: any): any { return null; }
  visitDirectiveProperty(ast: BoundDirectivePropertyAst, context: any): any { return null; }
}

class FooAstTransformer implements TemplateAstVisitor {
  visitNgContent(ast: NgContentAst, context: any): any { throw 'not implemented'; }
  visitEmbeddedTemplate(ast: EmbeddedTemplateAst, context: any): any { throw 'not implemented'; }
  visitElement(ast: ElementAst, context: any): any {
    if (ast.name != 'div') return ast;
    return new ElementAst(
        'foo', [], [], [], [], [], [], false, [], ast.ngContentIndex, ast.sourceSpan);
  }
  visitReference(ast: ReferenceAst, context: any): any { throw 'not implemented'; }
  visitVariable(ast: VariableAst, context: any): any { throw 'not implemented'; }
  visitEvent(ast: BoundEventAst, context: any): any { throw 'not implemented'; }
  visitElementProperty(ast: BoundElementPropertyAst, context: any): any { throw 'not implemented'; }
  visitAttr(ast: AttrAst, context: any): any { throw 'not implemented'; }
  visitBoundText(ast: BoundTextAst, context: any): any { throw 'not implemented'; }
  visitText(ast: TextAst, context: any): any { throw 'not implemented'; }
  visitDirective(ast: DirectiveAst, context: any): any { throw 'not implemented'; }
  visitDirectiveProperty(ast: BoundDirectivePropertyAst, context: any): any {
    throw 'not implemented';
  }
}

class BarAstTransformer extends FooAstTransformer {
  visitElement(ast: ElementAst, context: any): any {
    if (ast.name != 'foo') return ast;
    return new ElementAst(
        'bar', [], [], [], [], [], [], false, [], ast.ngContentIndex, ast.sourceSpan);
  }
}

class ArrayConsole implements Console {
  logs: string[] = [];
  warnings: string[] = [];
  log(msg: string) { this.logs.push(msg); }
  warn(msg: string) { this.warnings.push(msg); }
}