angular-docs-cn/modules/angular2/test/compiler/template_parser_spec.ts

import {
  ddescribe,
  describe,
  it,
  iit,
  xit,
  expect,
  beforeEach,
  afterEach,
  inject,
  beforeEachProviders
} from 'angular2/testing_internal';
import {provide} from 'angular2/src/core/di';

import {TEST_PROVIDERS} from './test_bindings';
import {isPresent} from 'angular2/src/facade/lang';
import {
  TemplateParser,
  splitClasses,
  TEMPLATE_TRANSFORMS
} from 'angular2/src/compiler/template_parser';
import {
  CompileDirectiveMetadata,
  CompileTypeMetadata,
  CompileTemplateMetadata
} from 'angular2/src/compiler/directive_metadata';
import {
  templateVisitAll,
  TemplateAstVisitor,
  TemplateAst,
  NgContentAst,
  EmbeddedTemplateAst,
  ElementAst,
  VariableAst,
  BoundEventAst,
  BoundElementPropertyAst,
  BoundDirectivePropertyAst,
  AttrAst,
  BoundTextAst,
  TextAst,
  PropertyBindingType,
  DirectiveAst
} from 'angular2/src/compiler/template_ast';

import {ElementSchemaRegistry} from 'angular2/src/compiler/schema/element_schema_registry';
import {MockSchemaRegistry} from './schema_registry_mock';

import {Unparser} from '../core/change_detection/parser/unparser';

var expressionUnparser = new Unparser();

export function main() {
  describe('TemplateParser', () => {
    beforeEachProviders(() => [
      TEST_PROVIDERS,
      provide(ElementSchemaRegistry,
              {
                useValue: new MockSchemaRegistry({'invalidProp': false},
                                                 {'mappedAttr': 'mappedProp'})
              })
    ]);

    var parser: TemplateParser;
    var ngIf;

    beforeEach(inject([TemplateParser], (_parser) => {
      parser = _parser;
      ngIf = CompileDirectiveMetadata.create(
          {selector: '[ngIf]', type: new CompileTypeMetadata({name: 'NgIf'}), inputs: ['ngIf']});
    }));

    function parse(template: string, directives: CompileDirectiveMetadata[]): TemplateAst[] {
      return parser.parse(template, directives, 'TestComp');
    }

    describe('template transform', () => {
      beforeEachProviders(
          () => [provide(TEMPLATE_TRANSFORMS, {useValue: new FooAstTransformer(), multi: true})]);

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

      describe('multiple', () => {
        beforeEachProviders(
            () => [provide(TEMPLATE_TRANSFORMS, {useValue: new BarAstTransformer(), multi: true})]);

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

    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 }}']]);
      });

      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]
              ]);
        });

      });

      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({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 locate directives components first and ordered by the directives array in the View',
           () => {
             var dirA = CompileDirectiveMetadata.create(
                 {selector: '[a]', type: new CompileTypeMetadata({name: 'DirA'})});
             var dirB = CompileDirectiveMetadata.create(
                 {selector: '[b]', type: new CompileTypeMetadata({name: 'DirB'})});
             var dirC = CompileDirectiveMetadata.create(
                 {selector: '[c]', type: new CompileTypeMetadata({name: 'DirC'})});
             var comp = CompileDirectiveMetadata.create({
               selector: 'div',
               isComponent: true,
               type: new CompileTypeMetadata({name: 'ZComp'}),
               template: new CompileTemplateMetadata({ngContentSelectors: []})
             });
             expect(humanizeTplAst(parse('<div a c b>', [dirA, dirB, dirC, comp])))
                 .toEqual([
                   [ElementAst, 'div'],
                   [AttrAst, 'a', ''],
                   [AttrAst, 'c', ''],
                   [AttrAst, 'b', ''],
                   [DirectiveAst, comp],
                   [DirectiveAst, dirA],
                   [DirectiveAst, dirB],
                   [DirectiveAst, dirC]
                 ]);
           });

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

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

      });

      describe('variables', () => {

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

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

        it('should parse camel case variables', () => {
          expect(humanizeTplAst(parse('<div var-someA>', [])))
              .toEqual([[ElementAst, 'div'], [VariableAst, 'someA', '']]);
        });

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

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

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

        it('should allow variables with values that dont match a directive on embedded template elements',
           () => {
             expect(humanizeTplAst(parse('<template #a="b"></template>', [])))
                 .toEqual([[EmbeddedTemplateAst], [VariableAst, 'a', 'b']]);
           });

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

      });

      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],
                 ]);
           });
      });

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

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

        });

        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', () => {
      function createComp(selector: string,
                          ngContentSelectors: string[]): CompileDirectiveMetadata {
        return CompileDirectiveMetadata.create({
          selector: selector,
          isComponent: true,
          type: new CompileTypeMetadata({name: 'SomeComp'}),
          template: new CompileTemplateMetadata({ngContentSelectors: ngContentSelectors})
        })
      }

      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]]);
      });
    });

    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 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 errors in expressions', () => {
        expect(() => parse('<div [prop]="a b"></div>', [])).toThrowErrorWith(`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({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({name: 'DirA'}),
          template: new CompileTemplateMetadata({ngContentSelectors: []})
        });
        var dirB = CompileDirectiveMetadata.create({
          selector: 'div',
          isComponent: true,
          type: new CompileTypeMetadata({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({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 ("<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 ("[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({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 ("[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 variables', () => {
        var dirA = CompileDirectiveMetadata.create(
            {selector: '[a]', type: new CompileTypeMetadata({name: 'DirA'}), exportAs: 'dirA'});
        expect(humanizeTplAstSourceSpans(parse('<div a #a="dirA"></div>', [dirA])))
            .toEqual([
              [ElementAst, 'div', '<div a #a="dirA">'],
              [AttrAst, 'a', '', 'a'],
              [DirectiveAst, dirA, '<div a #a="dirA">'],
              [VariableAst, 'a', 'dirA', '#a="dirA"']
            ]);
      });

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

      it('should support directive in namespace', () => {
        var tagSel = CompileDirectiveMetadata.create(
            {selector: 'circle', type: new CompileTypeMetadata({name: 'elDir'})});
        var attrSel = CompileDirectiveMetadata.create(
            {selector: '[href]', type: new CompileTypeMetadata({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({name: 'DirA'}), inputs: ['aProp']});
        expect(humanizeTplAstSourceSpans(parse('<div [aProp]="foo | bar"></div>', [dirA])))
            .toEqual([
              [ElementAst, 'div', '<div [aProp]="foo | bar">'],
              [DirectiveAst, dirA, '<div [aProp]="foo | bar">'],
              [BoundDirectivePropertyAst, 'aProp', '(foo | bar)', '[aProp]="foo | bar"']
            ]);
      });

    });
  });
}

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

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

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

  constructor(private includeSourceSpan: boolean){};

  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.vars);
    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.exportAsVars);
    templateVisitAll(this, ast.directives);
    templateVisitAll(this, ast.children);
    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, expressionUnparser.unparse(ast.handler)];
    this.result.push(this._appendContext(ast, res));
    return null;
  }
  visitElementProperty(ast: BoundElementPropertyAst, context: any): any {
    var res = [
      BoundElementPropertyAst,
      ast.type,
      ast.name,
      expressionUnparser.unparse(ast.value),
      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, expressionUnparser.unparse(ast.value)];
    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);
    templateVisitAll(this, ast.exportAsVars);
    return null;
  }
  visitDirectiveProperty(ast: BoundDirectivePropertyAst, context: any): any {
    var res = [BoundDirectivePropertyAst, ast.directiveName, expressionUnparser.unparse(ast.value)];
    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;
  }
  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(${expressionUnparser.unparse(ast.value)})`, ast.ngContentIndex]);
    return null;
  }
  visitText(ast: TextAst, context: any): any {
    this.result.push([`#text(${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', [], [], [], [], [], [], ast.ngContentIndex, ast.sourceSpan);
  }
  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', [], [], [], [], [], [], ast.ngContentIndex, ast.sourceSpan);
  }
}