00075647be
In ReflectionCapabilities, when checking for own parameters of a type, inherit the types properly for classes that do have a constructor, but the constructor takes no declared parameters and just delegates to super(...arguments). This removes the need to declare trivial constructors in such classes to make them work properly in JIT mode. Without this, DI fails and injectables are undefined. PR Close #29232
277 lines
10 KiB
TypeScript
277 lines
10 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Type, isType} from '../interface/type';
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import {ANNOTATIONS, PARAMETERS, PROP_METADATA} from '../util/decorators';
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import {global} from '../util/global';
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import {stringify} from '../util/stringify';
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import {PlatformReflectionCapabilities} from './platform_reflection_capabilities';
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import {GetterFn, MethodFn, SetterFn} from './types';
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/**
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* Attention: These regex has to hold even if the code is minified!
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*/
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export const DELEGATE_CTOR = /^function\s+\S+\(\)\s*{[\s\S]+\.apply\(this,\s*arguments\)/;
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export const INHERITED_CLASS = /^class\s+[A-Za-z\d$_]*\s*extends\s+[^{]+{/;
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export const INHERITED_CLASS_WITH_CTOR =
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/^class\s+[A-Za-z\d$_]*\s*extends\s+[^{]+{[\s\S]*constructor\s*\(/;
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export const INHERITED_CLASS_WITH_DELEGATE_CTOR =
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/^class\s+[A-Za-z\d$_]*\s*extends\s+[^{]+{[\s\S]*constructor\s*\(\)\s*{\s+super\(\.\.\.arguments\)/;
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export class ReflectionCapabilities implements PlatformReflectionCapabilities {
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private _reflect: any;
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constructor(reflect?: any) { this._reflect = reflect || global['Reflect']; }
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isReflectionEnabled(): boolean { return true; }
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factory<T>(t: Type<T>): (args: any[]) => T { return (...args: any[]) => new t(...args); }
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/** @internal */
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_zipTypesAndAnnotations(paramTypes: any[], paramAnnotations: any[]): any[][] {
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let result: any[][];
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if (typeof paramTypes === 'undefined') {
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result = new Array(paramAnnotations.length);
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} else {
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result = new Array(paramTypes.length);
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}
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for (let i = 0; i < result.length; i++) {
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// TS outputs Object for parameters without types, while Traceur omits
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// the annotations. For now we preserve the Traceur behavior to aid
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// migration, but this can be revisited.
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if (typeof paramTypes === 'undefined') {
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result[i] = [];
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} else if (paramTypes[i] != Object) {
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result[i] = [paramTypes[i]];
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} else {
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result[i] = [];
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}
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if (paramAnnotations && paramAnnotations[i] != null) {
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result[i] = result[i].concat(paramAnnotations[i]);
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}
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}
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return result;
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}
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private _ownParameters(type: Type<any>, parentCtor: any): any[][]|null {
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const typeStr = type.toString();
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// If we have no decorators, we only have function.length as metadata.
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// In that case, to detect whether a child class declared an own constructor or not,
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// we need to look inside of that constructor to check whether it is
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// just calling the parent.
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// This also helps to work around for https://github.com/Microsoft/TypeScript/issues/12439
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// that sets 'design:paramtypes' to []
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// if a class inherits from another class but has no ctor declared itself.
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if (DELEGATE_CTOR.exec(typeStr) || INHERITED_CLASS_WITH_DELEGATE_CTOR.exec(typeStr) ||
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(INHERITED_CLASS.exec(typeStr) && !INHERITED_CLASS_WITH_CTOR.exec(typeStr))) {
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return null;
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}
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// Prefer the direct API.
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if ((<any>type).parameters && (<any>type).parameters !== parentCtor.parameters) {
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return (<any>type).parameters;
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}
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// API of tsickle for lowering decorators to properties on the class.
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const tsickleCtorParams = (<any>type).ctorParameters;
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if (tsickleCtorParams && tsickleCtorParams !== parentCtor.ctorParameters) {
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// Newer tsickle uses a function closure
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// Retain the non-function case for compatibility with older tsickle
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const ctorParameters =
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typeof tsickleCtorParams === 'function' ? tsickleCtorParams() : tsickleCtorParams;
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const paramTypes = ctorParameters.map((ctorParam: any) => ctorParam && ctorParam.type);
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const paramAnnotations = ctorParameters.map(
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(ctorParam: any) =>
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ctorParam && convertTsickleDecoratorIntoMetadata(ctorParam.decorators));
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return this._zipTypesAndAnnotations(paramTypes, paramAnnotations);
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}
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// API for metadata created by invoking the decorators.
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const paramAnnotations = type.hasOwnProperty(PARAMETERS) && (type as any)[PARAMETERS];
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const paramTypes = this._reflect && this._reflect.getOwnMetadata &&
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this._reflect.getOwnMetadata('design:paramtypes', type);
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if (paramTypes || paramAnnotations) {
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return this._zipTypesAndAnnotations(paramTypes, paramAnnotations);
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}
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// If a class has no decorators, at least create metadata
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// based on function.length.
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// Note: We know that this is a real constructor as we checked
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// the content of the constructor above.
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return new Array((<any>type.length)).fill(undefined);
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}
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parameters(type: Type<any>): any[][] {
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// Note: only report metadata if we have at least one class decorator
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// to stay in sync with the static reflector.
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if (!isType(type)) {
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return [];
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}
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const parentCtor = getParentCtor(type);
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let parameters = this._ownParameters(type, parentCtor);
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if (!parameters && parentCtor !== Object) {
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parameters = this.parameters(parentCtor);
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}
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return parameters || [];
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}
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private _ownAnnotations(typeOrFunc: Type<any>, parentCtor: any): any[]|null {
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// Prefer the direct API.
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if ((<any>typeOrFunc).annotations && (<any>typeOrFunc).annotations !== parentCtor.annotations) {
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let annotations = (<any>typeOrFunc).annotations;
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if (typeof annotations === 'function' && annotations.annotations) {
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annotations = annotations.annotations;
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}
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return annotations;
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}
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// API of tsickle for lowering decorators to properties on the class.
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if ((<any>typeOrFunc).decorators && (<any>typeOrFunc).decorators !== parentCtor.decorators) {
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return convertTsickleDecoratorIntoMetadata((<any>typeOrFunc).decorators);
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}
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// API for metadata created by invoking the decorators.
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if (typeOrFunc.hasOwnProperty(ANNOTATIONS)) {
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return (typeOrFunc as any)[ANNOTATIONS];
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}
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return null;
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}
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annotations(typeOrFunc: Type<any>): any[] {
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if (!isType(typeOrFunc)) {
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return [];
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}
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const parentCtor = getParentCtor(typeOrFunc);
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const ownAnnotations = this._ownAnnotations(typeOrFunc, parentCtor) || [];
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const parentAnnotations = parentCtor !== Object ? this.annotations(parentCtor) : [];
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return parentAnnotations.concat(ownAnnotations);
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}
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private _ownPropMetadata(typeOrFunc: any, parentCtor: any): {[key: string]: any[]}|null {
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// Prefer the direct API.
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if ((<any>typeOrFunc).propMetadata &&
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(<any>typeOrFunc).propMetadata !== parentCtor.propMetadata) {
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let propMetadata = (<any>typeOrFunc).propMetadata;
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if (typeof propMetadata === 'function' && propMetadata.propMetadata) {
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propMetadata = propMetadata.propMetadata;
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}
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return propMetadata;
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}
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// API of tsickle for lowering decorators to properties on the class.
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if ((<any>typeOrFunc).propDecorators &&
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(<any>typeOrFunc).propDecorators !== parentCtor.propDecorators) {
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const propDecorators = (<any>typeOrFunc).propDecorators;
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const propMetadata = <{[key: string]: any[]}>{};
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Object.keys(propDecorators).forEach(prop => {
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propMetadata[prop] = convertTsickleDecoratorIntoMetadata(propDecorators[prop]);
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});
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return propMetadata;
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}
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// API for metadata created by invoking the decorators.
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if (typeOrFunc.hasOwnProperty(PROP_METADATA)) {
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return (typeOrFunc as any)[PROP_METADATA];
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}
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return null;
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}
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propMetadata(typeOrFunc: any): {[key: string]: any[]} {
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if (!isType(typeOrFunc)) {
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return {};
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}
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const parentCtor = getParentCtor(typeOrFunc);
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const propMetadata: {[key: string]: any[]} = {};
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if (parentCtor !== Object) {
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const parentPropMetadata = this.propMetadata(parentCtor);
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Object.keys(parentPropMetadata).forEach((propName) => {
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propMetadata[propName] = parentPropMetadata[propName];
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});
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}
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const ownPropMetadata = this._ownPropMetadata(typeOrFunc, parentCtor);
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if (ownPropMetadata) {
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Object.keys(ownPropMetadata).forEach((propName) => {
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const decorators: any[] = [];
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if (propMetadata.hasOwnProperty(propName)) {
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decorators.push(...propMetadata[propName]);
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}
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decorators.push(...ownPropMetadata[propName]);
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propMetadata[propName] = decorators;
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});
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}
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return propMetadata;
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}
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ownPropMetadata(typeOrFunc: any): {[key: string]: any[]} {
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if (!isType(typeOrFunc)) {
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return {};
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}
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return this._ownPropMetadata(typeOrFunc, getParentCtor(typeOrFunc)) || {};
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}
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hasLifecycleHook(type: any, lcProperty: string): boolean {
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return type instanceof Type && lcProperty in type.prototype;
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}
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guards(type: any): {[key: string]: any} { return {}; }
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getter(name: string): GetterFn { return <GetterFn>new Function('o', 'return o.' + name + ';'); }
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setter(name: string): SetterFn {
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return <SetterFn>new Function('o', 'v', 'return o.' + name + ' = v;');
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}
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method(name: string): MethodFn {
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const functionBody = `if (!o.${name}) throw new Error('"${name}" is undefined');
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return o.${name}.apply(o, args);`;
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return <MethodFn>new Function('o', 'args', functionBody);
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}
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// There is not a concept of import uri in Js, but this is useful in developing Dart applications.
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importUri(type: any): string {
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// StaticSymbol
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if (typeof type === 'object' && type['filePath']) {
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return type['filePath'];
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}
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// Runtime type
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return `./${stringify(type)}`;
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}
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resourceUri(type: any): string { return `./${stringify(type)}`; }
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resolveIdentifier(name: string, moduleUrl: string, members: string[], runtime: any): any {
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return runtime;
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}
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resolveEnum(enumIdentifier: any, name: string): any { return enumIdentifier[name]; }
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}
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function convertTsickleDecoratorIntoMetadata(decoratorInvocations: any[]): any[] {
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if (!decoratorInvocations) {
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return [];
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}
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return decoratorInvocations.map(decoratorInvocation => {
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const decoratorType = decoratorInvocation.type;
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const annotationCls = decoratorType.annotationCls;
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const annotationArgs = decoratorInvocation.args ? decoratorInvocation.args : [];
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return new annotationCls(...annotationArgs);
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});
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}
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function getParentCtor(ctor: Function): Type<any> {
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const parentProto = ctor.prototype ? Object.getPrototypeOf(ctor.prototype) : null;
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const parentCtor = parentProto ? parentProto.constructor : null;
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// Note: We always use `Object` as the null value
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// to simplify checking later on.
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return parentCtor || Object;
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}
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