angular-cn/modules/angular2/src/compiler/runtime_metadata.ts

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import {resolveForwardRef} from 'angular2/src/core/di';
import {
Type,
isBlank,
isPresent,
isArray,
stringify,
RegExpWrapper
} from 'angular2/src/facade/lang';
import {BaseException} from 'angular2/src/facade/exceptions';
import * as cpl from './directive_metadata';
import * as md from 'angular2/src/core/metadata/directives';
import {DirectiveResolver} from 'angular2/src/core/linker/directive_resolver';
import {PipeResolver} from 'angular2/src/core/linker/pipe_resolver';
import {ViewResolver} from 'angular2/src/core/linker/view_resolver';
import {ViewMetadata} from 'angular2/src/core/metadata/view';
import {hasLifecycleHook} from 'angular2/src/core/linker/directive_lifecycle_reflector';
import {LifecycleHooks, LIFECYCLE_HOOKS_VALUES} from 'angular2/src/core/linker/interfaces';
import {reflector} from 'angular2/src/core/reflection/reflection';
import {Injectable, Inject, Optional} from 'angular2/src/core/di';
import {PLATFORM_DIRECTIVES, PLATFORM_PIPES} from 'angular2/src/core/platform_directives_and_pipes';
import {MODULE_SUFFIX} from './util';
import {assertArrayOfStrings} from './assertions';
import {getUrlScheme} from 'angular2/src/compiler/url_resolver';
@Injectable()
export class RuntimeMetadataResolver {
private _directiveCache = new Map<Type, cpl.CompileDirectiveMetadata>();
private _pipeCache = new Map<Type, cpl.CompilePipeMetadata>();
private _anonymousTypes = new Map<Object, number>();
private _anonymousTypeIndex = 0;
constructor(private _directiveResolver: DirectiveResolver, private _pipeResolver: PipeResolver,
private _viewResolver: ViewResolver,
@Optional() @Inject(PLATFORM_DIRECTIVES) private _platformDirectives: Type[],
@Optional() @Inject(PLATFORM_PIPES) private _platformPipes: Type[]) {}
/**
* Wrap the stringify method to avoid naming things `function (arg1...) {`
*/
private sanitizeName(obj: any): string {
let result = stringify(obj);
if (result.indexOf('(') < 0) {
return result;
}
let found = this._anonymousTypes.get(obj);
if (!found) {
this._anonymousTypes.set(obj, this._anonymousTypeIndex++);
found = this._anonymousTypes.get(obj);
}
return `anonymous_type_${found}_`;
}
getDirectiveMetadata(directiveType: Type): cpl.CompileDirectiveMetadata {
var meta = this._directiveCache.get(directiveType);
if (isBlank(meta)) {
var dirMeta = this._directiveResolver.resolve(directiveType);
var moduleUrl = null;
var templateMeta = null;
var changeDetectionStrategy = null;
if (dirMeta instanceof md.ComponentMetadata) {
assertArrayOfStrings('styles', dirMeta.styles);
var cmpMeta = <md.ComponentMetadata>dirMeta;
moduleUrl = calcModuleUrl(directiveType, cmpMeta);
var viewMeta = this._viewResolver.resolve(directiveType);
assertArrayOfStrings('styles', viewMeta.styles);
templateMeta = new cpl.CompileTemplateMetadata({
encapsulation: viewMeta.encapsulation,
template: viewMeta.template,
templateUrl: viewMeta.templateUrl,
styles: viewMeta.styles,
styleUrls: viewMeta.styleUrls
});
changeDetectionStrategy = cmpMeta.changeDetection;
}
meta = cpl.CompileDirectiveMetadata.create({
selector: dirMeta.selector,
exportAs: dirMeta.exportAs,
isComponent: isPresent(templateMeta),
dynamicLoadable: true,
type: new cpl.CompileTypeMetadata(
{name: this.sanitizeName(directiveType), moduleUrl: moduleUrl, runtime: directiveType}),
template: templateMeta,
changeDetection: changeDetectionStrategy,
inputs: dirMeta.inputs,
outputs: dirMeta.outputs,
host: dirMeta.host,
lifecycleHooks: LIFECYCLE_HOOKS_VALUES.filter(hook => hasLifecycleHook(hook, directiveType))
});
this._directiveCache.set(directiveType, meta);
}
return meta;
}
getPipeMetadata(pipeType: Type): cpl.CompilePipeMetadata {
var meta = this._pipeCache.get(pipeType);
if (isBlank(meta)) {
var pipeMeta = this._pipeResolver.resolve(pipeType);
var moduleUrl = reflector.importUri(pipeType);
meta = new cpl.CompilePipeMetadata({
type: new cpl.CompileTypeMetadata(
{name: this.sanitizeName(pipeType), moduleUrl: moduleUrl, runtime: pipeType}),
name: pipeMeta.name,
pure: pipeMeta.pure
});
this._pipeCache.set(pipeType, meta);
}
return meta;
}
getViewDirectivesMetadata(component: Type): cpl.CompileDirectiveMetadata[] {
var view = this._viewResolver.resolve(component);
var directives = flattenDirectives(view, this._platformDirectives);
for (var i = 0; i < directives.length; i++) {
if (!isValidType(directives[i])) {
throw new BaseException(
`Unexpected directive value '${stringify(directives[i])}' on the View of component '${stringify(component)}'`);
}
}
return directives.map(type => this.getDirectiveMetadata(type));
}
getViewPipesMetadata(component: Type): cpl.CompilePipeMetadata[] {
var view = this._viewResolver.resolve(component);
var pipes = flattenPipes(view, this._platformPipes);
for (var i = 0; i < pipes.length; i++) {
if (!isValidType(pipes[i])) {
throw new BaseException(
`Unexpected piped value '${stringify(pipes[i])}' on the View of component '${stringify(component)}'`);
}
}
return pipes.map(type => this.getPipeMetadata(type));
}
}
function flattenDirectives(view: ViewMetadata, platformDirectives: any[]): Type[] {
let directives = [];
if (isPresent(platformDirectives)) {
flattenArray(platformDirectives, directives);
}
if (isPresent(view.directives)) {
flattenArray(view.directives, directives);
}
return directives;
}
function flattenPipes(view: ViewMetadata, platformPipes: any[]): Type[] {
let pipes = [];
if (isPresent(platformPipes)) {
flattenArray(platformPipes, pipes);
}
if (isPresent(view.pipes)) {
flattenArray(view.pipes, pipes);
}
return pipes;
}
function flattenArray(tree: any[], out: Array<Type | any[]>): void {
for (var i = 0; i < tree.length; i++) {
var item = resolveForwardRef(tree[i]);
if (isArray(item)) {
flattenArray(item, out);
} else {
out.push(item);
}
}
}
function isValidType(value: Type): boolean {
return isPresent(value) && (value instanceof Type);
}
function calcModuleUrl(type: Type, cmpMetadata: md.ComponentMetadata): string {
var moduleId = cmpMetadata.moduleId;
if (isPresent(moduleId)) {
var scheme = getUrlScheme(moduleId);
return isPresent(scheme) && scheme.length > 0 ? moduleId :
`package:${moduleId}${MODULE_SUFFIX}`;
} else {
return reflector.importUri(type);
}
}