angular-cn/modules/@angular/compiler/testing/view_resolver_mock.ts

139 lines
4.1 KiB
TypeScript

import {Injectable, ViewMetadata, Type, BaseException} from '@angular/core';
import {ViewResolver} from '../index';
import {Map} from '../src/facade/collection';
import {isPresent, stringify, isBlank, isArray} from '../src/facade/lang';
import {resolveForwardRef} from '@angular/core';
@Injectable()
export class MockViewResolver extends ViewResolver {
/** @internal */
_views = new Map<Type, ViewMetadata>();
/** @internal */
_inlineTemplates = new Map<Type, string>();
/** @internal */
_viewCache = new Map<Type, ViewMetadata>();
/** @internal */
_directiveOverrides = new Map<Type, Map<Type, Type>>();
constructor() { super(); }
/**
* Overrides the {@link ViewMetadata} for a component.
*
* @param {Type} component
* @param {ViewDefinition} view
*/
setView(component: Type, view: ViewMetadata): void {
this._checkOverrideable(component);
this._views.set(component, view);
}
/**
* Overrides the inline template for a component - other configuration remains unchanged.
*
* @param {Type} component
* @param {string} template
*/
setInlineTemplate(component: Type, template: string): void {
this._checkOverrideable(component);
this._inlineTemplates.set(component, template);
}
/**
* Overrides a directive from the component {@link ViewMetadata}.
*
* @param {Type} component
* @param {Type} from
* @param {Type} to
*/
overrideViewDirective(component: Type, from: Type, to: Type): void {
this._checkOverrideable(component);
var overrides = this._directiveOverrides.get(component);
if (isBlank(overrides)) {
overrides = new Map<Type, Type>();
this._directiveOverrides.set(component, overrides);
}
overrides.set(from, to);
}
/**
* Returns the {@link ViewMetadata} for a component:
* - Set the {@link ViewMetadata} to the overridden view when it exists or fallback to the default
* `ViewResolver`,
* see `setView`.
* - Override the directives, see `overrideViewDirective`.
* - Override the @View definition, see `setInlineTemplate`.
*
* @param component
* @returns {ViewDefinition}
*/
resolve(component: Type): ViewMetadata {
var view = this._viewCache.get(component);
if (isPresent(view)) return view;
view = this._views.get(component);
if (isBlank(view)) {
view = super.resolve(component);
}
var directives = [];
var overrides = this._directiveOverrides.get(component);
if (isPresent(overrides) && isPresent(view.directives)) {
flattenArray(view.directives, directives);
overrides.forEach((to, from) => {
var srcIndex = directives.indexOf(from);
if (srcIndex == -1) {
throw new BaseException(
`Overriden directive ${stringify(from)} not found in the template of ${stringify(component)}`);
}
directives[srcIndex] = to;
});
view = new ViewMetadata(
{template: view.template, templateUrl: view.templateUrl, directives: directives});
}
var inlineTemplate = this._inlineTemplates.get(component);
if (isPresent(inlineTemplate)) {
view = new ViewMetadata(
{template: inlineTemplate, templateUrl: null, directives: view.directives});
}
this._viewCache.set(component, view);
return view;
}
/**
* @internal
*
* Once a component has been compiled, the AppProtoView is stored in the compiler cache.
*
* Then it should not be possible to override the component configuration after the component
* has been compiled.
*
* @param {Type} component
*/
_checkOverrideable(component: Type): void {
var cached = this._viewCache.get(component);
if (isPresent(cached)) {
throw new BaseException(
`The component ${stringify(component)} has already been compiled, its configuration can not be changed`);
}
}
}
function flattenArray(tree: any[], out: Array<Type | any[]>): void {
for (var i = 0; i < tree.length; i++) {
var item = resolveForwardRef(tree[i]);
if (isArray(item)) {
flattenArray(item, out);
} else {
out.push(item);
}
}
}