@angular/core
Version:
Angular - the core framework
263 lines • 37 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { isType, Type } from '../interface/type';
import { newArray } from '../util/array_utils';
import { ANNOTATIONS, PARAMETERS, PROP_METADATA } from '../util/decorators';
import { global } from '../util/global';
/*
* #########################
* Attention: These Regular expressions have to hold even if the code is minified!
* ##########################
*/
/**
* Regular expression that detects pass-through constructors for ES5 output. This Regex
* intends to capture the common delegation pattern emitted by TypeScript and Babel. Also
* it intends to capture the pattern where existing constructors have been downleveled from
* ES2015 to ES5 using TypeScript w/ downlevel iteration. e.g.
*
* ```
* function MyClass() {
* var _this = _super.apply(this, arguments) || this;
* ```
*
* downleveled to ES5 with `downlevelIteration` for TypeScript < 4.2:
* ```
* function MyClass() {
* var _this = _super.apply(this, __spread(arguments)) || this;
* ```
*
* or downleveled to ES5 with `downlevelIteration` for TypeScript >= 4.2:
* ```
* function MyClass() {
* var _this = _super.apply(this, __spreadArray([], __read(arguments), false)) || this;
* ```
*
* More details can be found in: https://github.com/angular/angular/issues/38453.
*/
export const ES5_DELEGATE_CTOR = /^function\s+\S+\(\)\s*{[\s\S]+\.apply\(this,\s*(arguments|(?:[^()]+\(\[\],)?[^()]+\(arguments\).*)\)/;
/** Regular expression that detects ES2015 classes which extend from other classes. */
export const ES2015_INHERITED_CLASS = /^class\s+[A-Za-z\d$_]*\s*extends\s+[^{]+{/;
/**
* Regular expression that detects ES2015 classes which extend from other classes and
* have an explicit constructor defined.
*/
export const ES2015_INHERITED_CLASS_WITH_CTOR = /^class\s+[A-Za-z\d$_]*\s*extends\s+[^{]+{[\s\S]*constructor\s*\(/;
/**
* Regular expression that detects ES2015 classes which extend from other classes
* and inherit a constructor.
*/
export const ES2015_INHERITED_CLASS_WITH_DELEGATE_CTOR = /^class\s+[A-Za-z\d$_]*\s*extends\s+[^{]+{[\s\S]*constructor\s*\(\)\s*{[^}]*super\(\.\.\.arguments\)/;
/**
* Determine whether a stringified type is a class which delegates its constructor
* to its parent.
*
* This is not trivial since compiled code can actually contain a constructor function
* even if the original source code did not. For instance, when the child class contains
* an initialized instance property.
*/
export function isDelegateCtor(typeStr) {
return (ES5_DELEGATE_CTOR.test(typeStr) ||
ES2015_INHERITED_CLASS_WITH_DELEGATE_CTOR.test(typeStr) ||
(ES2015_INHERITED_CLASS.test(typeStr) && !ES2015_INHERITED_CLASS_WITH_CTOR.test(typeStr)));
}
export class ReflectionCapabilities {
constructor(reflect) {
this._reflect = reflect || global['Reflect'];
}
factory(t) {
return (...args) => new t(...args);
}
/** @internal */
_zipTypesAndAnnotations(paramTypes, paramAnnotations) {
let result;
if (typeof paramTypes === 'undefined') {
result = newArray(paramAnnotations.length);
}
else {
result = newArray(paramTypes.length);
}
for (let i = 0; i < result.length; i++) {
// TS outputs Object for parameters without types, while Traceur omits
// the annotations. For now we preserve the Traceur behavior to aid
// migration, but this can be revisited.
if (typeof paramTypes === 'undefined') {
result[i] = [];
}
else if (paramTypes[i] && paramTypes[i] != Object) {
result[i] = [paramTypes[i]];
}
else {
result[i] = [];
}
if (paramAnnotations && paramAnnotations[i] != null) {
result[i] = result[i].concat(paramAnnotations[i]);
}
}
return result;
}
_ownParameters(type, parentCtor) {
const typeStr = type.toString();
// If we have no decorators, we only have function.length as metadata.
// In that case, to detect whether a child class declared an own constructor or not,
// we need to look inside of that constructor to check whether it is
// just calling the parent.
// This also helps to work around for https://github.com/Microsoft/TypeScript/issues/12439
// that sets 'design:paramtypes' to []
// if a class inherits from another class but has no ctor declared itself.
if (isDelegateCtor(typeStr)) {
return null;
}
// Prefer the direct API.
if (type.parameters && type.parameters !== parentCtor.parameters) {
return type.parameters;
}
// API of tsickle for lowering decorators to properties on the class.
const tsickleCtorParams = type.ctorParameters;
if (tsickleCtorParams && tsickleCtorParams !== parentCtor.ctorParameters) {
// Newer tsickle uses a function closure
// Retain the non-function case for compatibility with older tsickle
const ctorParameters = typeof tsickleCtorParams === 'function' ? tsickleCtorParams() : tsickleCtorParams;
const paramTypes = ctorParameters.map((ctorParam) => ctorParam && ctorParam.type);
const paramAnnotations = ctorParameters.map((ctorParam) => ctorParam && convertTsickleDecoratorIntoMetadata(ctorParam.decorators));
return this._zipTypesAndAnnotations(paramTypes, paramAnnotations);
}
// API for metadata created by invoking the decorators.
const paramAnnotations = type.hasOwnProperty(PARAMETERS) && type[PARAMETERS];
const paramTypes = this._reflect &&
this._reflect.getOwnMetadata &&
this._reflect.getOwnMetadata('design:paramtypes', type);
if (paramTypes || paramAnnotations) {
return this._zipTypesAndAnnotations(paramTypes, paramAnnotations);
}
// If a class has no decorators, at least create metadata
// based on function.length.
// Note: We know that this is a real constructor as we checked
// the content of the constructor above.
return newArray(type.length);
}
parameters(type) {
// Note: only report metadata if we have at least one class decorator
// to stay in sync with the static reflector.
if (!isType(type)) {
return [];
}
const parentCtor = getParentCtor(type);
let parameters = this._ownParameters(type, parentCtor);
if (!parameters && parentCtor !== Object) {
parameters = this.parameters(parentCtor);
}
return parameters || [];
}
_ownAnnotations(typeOrFunc, parentCtor) {
// Prefer the direct API.
if (typeOrFunc.annotations && typeOrFunc.annotations !== parentCtor.annotations) {
let annotations = typeOrFunc.annotations;
if (typeof annotations === 'function' && annotations.annotations) {
annotations = annotations.annotations;
}
return annotations;
}
// API of tsickle for lowering decorators to properties on the class.
if (typeOrFunc.decorators && typeOrFunc.decorators !== parentCtor.decorators) {
return convertTsickleDecoratorIntoMetadata(typeOrFunc.decorators);
}
// API for metadata created by invoking the decorators.
if (typeOrFunc.hasOwnProperty(ANNOTATIONS)) {
return typeOrFunc[ANNOTATIONS];
}
return null;
}
annotations(typeOrFunc) {
if (!isType(typeOrFunc)) {
return [];
}
const parentCtor = getParentCtor(typeOrFunc);
const ownAnnotations = this._ownAnnotations(typeOrFunc, parentCtor) || [];
const parentAnnotations = parentCtor !== Object ? this.annotations(parentCtor) : [];
return parentAnnotations.concat(ownAnnotations);
}
_ownPropMetadata(typeOrFunc, parentCtor) {
// Prefer the direct API.
if (typeOrFunc.propMetadata &&
typeOrFunc.propMetadata !== parentCtor.propMetadata) {
let propMetadata = typeOrFunc.propMetadata;
if (typeof propMetadata === 'function' && propMetadata.propMetadata) {
propMetadata = propMetadata.propMetadata;
}
return propMetadata;
}
// API of tsickle for lowering decorators to properties on the class.
if (typeOrFunc.propDecorators &&
typeOrFunc.propDecorators !== parentCtor.propDecorators) {
const propDecorators = typeOrFunc.propDecorators;
const propMetadata = {};
Object.keys(propDecorators).forEach((prop) => {
propMetadata[prop] = convertTsickleDecoratorIntoMetadata(propDecorators[prop]);
});
return propMetadata;
}
// API for metadata created by invoking the decorators.
if (typeOrFunc.hasOwnProperty(PROP_METADATA)) {
return typeOrFunc[PROP_METADATA];
}
return null;
}
propMetadata(typeOrFunc) {
if (!isType(typeOrFunc)) {
return {};
}
const parentCtor = getParentCtor(typeOrFunc);
const propMetadata = {};
if (parentCtor !== Object) {
const parentPropMetadata = this.propMetadata(parentCtor);
Object.keys(parentPropMetadata).forEach((propName) => {
propMetadata[propName] = parentPropMetadata[propName];
});
}
const ownPropMetadata = this._ownPropMetadata(typeOrFunc, parentCtor);
if (ownPropMetadata) {
Object.keys(ownPropMetadata).forEach((propName) => {
const decorators = [];
if (propMetadata.hasOwnProperty(propName)) {
decorators.push(...propMetadata[propName]);
}
decorators.push(...ownPropMetadata[propName]);
propMetadata[propName] = decorators;
});
}
return propMetadata;
}
ownPropMetadata(typeOrFunc) {
if (!isType(typeOrFunc)) {
return {};
}
return this._ownPropMetadata(typeOrFunc, getParentCtor(typeOrFunc)) || {};
}
hasLifecycleHook(type, lcProperty) {
return type instanceof Type && lcProperty in type.prototype;
}
}
function convertTsickleDecoratorIntoMetadata(decoratorInvocations) {
if (!decoratorInvocations) {
return [];
}
return decoratorInvocations.map((decoratorInvocation) => {
const decoratorType = decoratorInvocation.type;
const annotationCls = decoratorType.annotationCls;
const annotationArgs = decoratorInvocation.args ? decoratorInvocation.args : [];
return new annotationCls(...annotationArgs);
});
}
function getParentCtor(ctor) {
const parentProto = ctor.prototype ? Object.getPrototypeOf(ctor.prototype) : null;
const parentCtor = parentProto ? parentProto.constructor : null;
// Note: We always use `Object` as the null value
// to simplify checking later on.
return parentCtor || Object;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {isType, Type} from '../interface/type';\nimport {newArray} from '../util/array_utils';\nimport {ANNOTATIONS, PARAMETERS, PROP_METADATA} from '../util/decorators';\nimport {global} from '../util/global';\n\nimport {PlatformReflectionCapabilities} from './platform_reflection_capabilities';\n\n/*\n * #########################\n * Attention: These Regular expressions have to hold even if the code is minified!\n * ##########################\n */\n\n/**\n * Regular expression that detects pass-through constructors for ES5 output. This Regex\n * intends to capture the common delegation pattern emitted by TypeScript and Babel. Also\n * it intends to capture the pattern where existing constructors have been downleveled from\n * ES2015 to ES5 using TypeScript w/ downlevel iteration. e.g.\n *\n * ```\n *   function MyClass() {\n *     var _this = _super.apply(this, arguments) || this;\n * ```\n *\n * downleveled to ES5 with `downlevelIteration` for TypeScript < 4.2:\n * ```\n *   function MyClass() {\n *     var _this = _super.apply(this, __spread(arguments)) || this;\n * ```\n *\n * or downleveled to ES5 with `downlevelIteration` for TypeScript >= 4.2:\n * ```\n *   function MyClass() {\n *     var _this = _super.apply(this, __spreadArray([], __read(arguments), false)) || this;\n * ```\n *\n * More details can be found in: https://github.com/angular/angular/issues/38453.\n */\nexport const ES5_DELEGATE_CTOR =\n  /^function\\s+\\S+\\(\\)\\s*{[\\s\\S]+\\.apply\\(this,\\s*(arguments|(?:[^()]+\\(\\[\\],)?[^()]+\\(arguments\\).*)\\)/;\n/** Regular expression that detects ES2015 classes which extend from other classes. */\nexport const ES2015_INHERITED_CLASS = /^class\\s+[A-Za-z\\d$_]*\\s*extends\\s+[^{]+{/;\n/**\n * Regular expression that detects ES2015 classes which extend from other classes and\n * have an explicit constructor defined.\n */\nexport const ES2015_INHERITED_CLASS_WITH_CTOR =\n  /^class\\s+[A-Za-z\\d$_]*\\s*extends\\s+[^{]+{[\\s\\S]*constructor\\s*\\(/;\n/**\n * Regular expression that detects ES2015 classes which extend from other classes\n * and inherit a constructor.\n */\nexport const ES2015_INHERITED_CLASS_WITH_DELEGATE_CTOR =\n  /^class\\s+[A-Za-z\\d$_]*\\s*extends\\s+[^{]+{[\\s\\S]*constructor\\s*\\(\\)\\s*{[^}]*super\\(\\.\\.\\.arguments\\)/;\n\n/**\n * Determine whether a stringified type is a class which delegates its constructor\n * to its parent.\n *\n * This is not trivial since compiled code can actually contain a constructor function\n * even if the original source code did not. For instance, when the child class contains\n * an initialized instance property.\n */\nexport function isDelegateCtor(typeStr: string): boolean {\n  return (\n    ES5_DELEGATE_CTOR.test(typeStr) ||\n    ES2015_INHERITED_CLASS_WITH_DELEGATE_CTOR.test(typeStr) ||\n    (ES2015_INHERITED_CLASS.test(typeStr) && !ES2015_INHERITED_CLASS_WITH_CTOR.test(typeStr))\n  );\n}\n\nexport class ReflectionCapabilities implements PlatformReflectionCapabilities {\n  private _reflect: any;\n\n  constructor(reflect?: any) {\n    this._reflect = reflect || global['Reflect'];\n  }\n\n  factory<T>(t: Type<T>): (args: any[]) => T {\n    return (...args: any[]) => new t(...args);\n  }\n\n  /** @internal */\n  _zipTypesAndAnnotations(paramTypes: any[], paramAnnotations: any[]): any[][] {\n    let result: any[][];\n\n    if (typeof paramTypes === 'undefined') {\n      result = newArray(paramAnnotations.length);\n    } else {\n      result = newArray(paramTypes.length);\n    }\n\n    for (let i = 0; i < result.length; i++) {\n      // TS outputs Object for parameters without types, while Traceur omits\n      // the annotations. For now we preserve the Traceur behavior to aid\n      // migration, but this can be revisited.\n      if (typeof paramTypes === 'undefined') {\n        result[i] = [];\n      } else if (paramTypes[i] && paramTypes[i] != Object) {\n        result[i] = [paramTypes[i]];\n      } else {\n        result[i] = [];\n      }\n      if (paramAnnotations && paramAnnotations[i] != null) {\n        result[i] = result[i].concat(paramAnnotations[i]);\n      }\n    }\n    return result;\n  }\n\n  private _ownParameters(type: Type<any>, parentCtor: any): any[][] | null {\n    const typeStr = type.toString();\n    // If we have no decorators, we only have function.length as metadata.\n    // In that case, to detect whether a child class declared an own constructor or not,\n    // we need to look inside of that constructor to check whether it is\n    // just calling the parent.\n    // This also helps to work around for https://github.com/Microsoft/TypeScript/issues/12439\n    // that sets 'design:paramtypes' to []\n    // if a class inherits from another class but has no ctor declared itself.\n    if (isDelegateCtor(typeStr)) {\n      return null;\n    }\n\n    // Prefer the direct API.\n    if ((<any>type).parameters && (<any>type).parameters !== parentCtor.parameters) {\n      return (<any>type).parameters;\n    }\n\n    // API of tsickle for lowering decorators to properties on the class.\n    const tsickleCtorParams = (<any>type).ctorParameters;\n    if (tsickleCtorParams && tsickleCtorParams !== parentCtor.ctorParameters) {\n      // Newer tsickle uses a function closure\n      // Retain the non-function case for compatibility with older tsickle\n      const ctorParameters =\n        typeof tsickleCtorParams === 'function' ? tsickleCtorParams() : tsickleCtorParams;\n      const paramTypes = ctorParameters.map((ctorParam: any) => ctorParam && ctorParam.type);\n      const paramAnnotations = ctorParameters.map(\n        (ctorParam: any) => ctorParam && convertTsickleDecoratorIntoMetadata(ctorParam.decorators),\n      );\n      return this._zipTypesAndAnnotations(paramTypes, paramAnnotations);\n    }\n\n    // API for metadata created by invoking the decorators.\n    const paramAnnotations = type.hasOwnProperty(PARAMETERS) && (type as any)[PARAMETERS];\n    const paramTypes =\n      this._reflect &&\n      this._reflect.getOwnMetadata &&\n      this._reflect.getOwnMetadata('design:paramtypes', type);\n    if (paramTypes || paramAnnotations) {\n      return this._zipTypesAndAnnotations(paramTypes, paramAnnotations);\n    }\n\n    // If a class has no decorators, at least create metadata\n    // based on function.length.\n    // Note: We know that this is a real constructor as we checked\n    // the content of the constructor above.\n    return newArray<any[]>(type.length);\n  }\n\n  parameters(type: Type<any>): any[][] {\n    // Note: only report metadata if we have at least one class decorator\n    // to stay in sync with the static reflector.\n    if (!isType(type)) {\n      return [];\n    }\n    const parentCtor = getParentCtor(type);\n    let parameters = this._ownParameters(type, parentCtor);\n    if (!parameters && parentCtor !== Object) {\n      parameters = this.parameters(parentCtor);\n    }\n    return parameters || [];\n  }\n\n  private _ownAnnotations(typeOrFunc: Type<any>, parentCtor: any): any[] | null {\n    // Prefer the direct API.\n    if ((<any>typeOrFunc).annotations && (<any>typeOrFunc).annotations !== parentCtor.annotations) {\n      let annotations = (<any>typeOrFunc).annotations;\n      if (typeof annotations === 'function' && annotations.annotations) {\n        annotations = annotations.annotations;\n      }\n      return annotations;\n    }\n\n    // API of tsickle for lowering decorators to properties on the class.\n    if ((<any>typeOrFunc).decorators && (<any>typeOrFunc).decorators !== parentCtor.decorators) {\n      return convertTsickleDecoratorIntoMetadata((<any>typeOrFunc).decorators);\n    }\n\n    // API for metadata created by invoking the decorators.\n    if (typeOrFunc.hasOwnProperty(ANNOTATIONS)) {\n      return (typeOrFunc as any)[ANNOTATIONS];\n    }\n    return null;\n  }\n\n  annotations(typeOrFunc: Type<any>): any[] {\n    if (!isType(typeOrFunc)) {\n      return [];\n    }\n    const parentCtor = getParentCtor(typeOrFunc);\n    const ownAnnotations = this._ownAnnotations(typeOrFunc, parentCtor) || [];\n    const parentAnnotations = parentCtor !== Object ? this.annotations(parentCtor) : [];\n    return parentAnnotations.concat(ownAnnotations);\n  }\n\n  private _ownPropMetadata(typeOrFunc: any, parentCtor: any): {[key: string]: any[]} | null {\n    // Prefer the direct API.\n    if (\n      (<any>typeOrFunc).propMetadata &&\n      (<any>typeOrFunc).propMetadata !== parentCtor.propMetadata\n    ) {\n      let propMetadata = (<any>typeOrFunc).propMetadata;\n      if (typeof propMetadata === 'function' && propMetadata.propMetadata) {\n        propMetadata = propMetadata.propMetadata;\n      }\n      return propMetadata;\n    }\n\n    // API of tsickle for lowering decorators to properties on the class.\n    if (\n      (<any>typeOrFunc).propDecorators &&\n      (<any>typeOrFunc).propDecorators !== parentCtor.propDecorators\n    ) {\n      const propDecorators = (<any>typeOrFunc).propDecorators;\n      const propMetadata = <{[key: string]: any[]}>{};\n      Object.keys(propDecorators).forEach((prop) => {\n        propMetadata[prop] = convertTsickleDecoratorIntoMetadata(propDecorators[prop]);\n      });\n      return propMetadata;\n    }\n\n    // API for metadata created by invoking the decorators.\n    if (typeOrFunc.hasOwnProperty(PROP_METADATA)) {\n      return (typeOrFunc as any)[PROP_METADATA];\n    }\n    return null;\n  }\n\n  propMetadata(typeOrFunc: any): {[key: string]: any[]} {\n    if (!isType(typeOrFunc)) {\n      return {};\n    }\n    const parentCtor = getParentCtor(typeOrFunc);\n    const propMetadata: {[key: string]: any[]} = {};\n    if (parentCtor !== Object) {\n      const parentPropMetadata = this.propMetadata(parentCtor);\n      Object.keys(parentPropMetadata).forEach((propName) => {\n        propMetadata[propName] = parentPropMetadata[propName];\n      });\n    }\n    const ownPropMetadata = this._ownPropMetadata(typeOrFunc, parentCtor);\n    if (ownPropMetadata) {\n      Object.keys(ownPropMetadata).forEach((propName) => {\n        const decorators: any[] = [];\n        if (propMetadata.hasOwnProperty(propName)) {\n          decorators.push(...propMetadata[propName]);\n        }\n        decorators.push(...ownPropMetadata[propName]);\n        propMetadata[propName] = decorators;\n      });\n    }\n    return propMetadata;\n  }\n\n  ownPropMetadata(typeOrFunc: any): {[key: string]: any[]} {\n    if (!isType(typeOrFunc)) {\n      return {};\n    }\n    return this._ownPropMetadata(typeOrFunc, getParentCtor(typeOrFunc)) || {};\n  }\n\n  hasLifecycleHook(type: any, lcProperty: string): boolean {\n    return type instanceof Type && lcProperty in type.prototype;\n  }\n}\n\nfunction convertTsickleDecoratorIntoMetadata(decoratorInvocations: any[]): any[] {\n  if (!decoratorInvocations) {\n    return [];\n  }\n  return decoratorInvocations.map((decoratorInvocation) => {\n    const decoratorType = decoratorInvocation.type;\n    const annotationCls = decoratorType.annotationCls;\n    const annotationArgs = decoratorInvocation.args ? decoratorInvocation.args : [];\n    return new annotationCls(...annotationArgs);\n  });\n}\n\nfunction getParentCtor(ctor: Function): Type<any> {\n  const parentProto = ctor.prototype ? Object.getPrototypeOf(ctor.prototype) : null;\n  const parentCtor = parentProto ? parentProto.constructor : null;\n  // Note: We always use `Object` as the null value\n  // to simplify checking later on.\n  return parentCtor || Object;\n}\n"]}