@angular/core
Version:
Angular - the core framework
114 lines • 17.9 kB
JavaScript
/**
* @license
* Copyright Google Inc. 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
*/
export const ANNOTATIONS = '__annotations__';
export const PARAMETERS = '__parameters__';
export const PROP_METADATA = '__prop__metadata__';
/**
* @suppress {globalThis}
*/
export function makeDecorator(name, props, parentClass, additionalProcessing, typeFn) {
const metaCtor = makeMetadataCtor(props);
function DecoratorFactory(...args) {
if (this instanceof DecoratorFactory) {
metaCtor.call(this, ...args);
return this;
}
const annotationInstance = new DecoratorFactory(...args);
return function TypeDecorator(cls) {
if (typeFn)
typeFn(cls, ...args);
// Use of Object.defineProperty is important since it creates non-enumerable property which
// prevents the property is copied during subclassing.
const annotations = cls.hasOwnProperty(ANNOTATIONS) ?
cls[ANNOTATIONS] :
Object.defineProperty(cls, ANNOTATIONS, { value: [] })[ANNOTATIONS];
annotations.push(annotationInstance);
if (additionalProcessing)
additionalProcessing(cls);
return cls;
};
}
if (parentClass) {
DecoratorFactory.prototype = Object.create(parentClass.prototype);
}
DecoratorFactory.prototype.ngMetadataName = name;
DecoratorFactory.annotationCls = DecoratorFactory;
return DecoratorFactory;
}
function makeMetadataCtor(props) {
return function ctor(...args) {
if (props) {
const values = props(...args);
for (const propName in values) {
this[propName] = values[propName];
}
}
};
}
export function makeParamDecorator(name, props, parentClass) {
const metaCtor = makeMetadataCtor(props);
function ParamDecoratorFactory(...args) {
if (this instanceof ParamDecoratorFactory) {
metaCtor.apply(this, args);
return this;
}
const annotationInstance = new ParamDecoratorFactory(...args);
ParamDecorator.annotation = annotationInstance;
return ParamDecorator;
function ParamDecorator(cls, unusedKey, index) {
// Use of Object.defineProperty is important since it creates non-enumerable property which
// prevents the property is copied during subclassing.
const parameters = cls.hasOwnProperty(PARAMETERS) ?
cls[PARAMETERS] :
Object.defineProperty(cls, PARAMETERS, { value: [] })[PARAMETERS];
// there might be gaps if some in between parameters do not have annotations.
// we pad with nulls.
while (parameters.length <= index) {
parameters.push(null);
}
(parameters[index] = parameters[index] || []).push(annotationInstance);
return cls;
}
}
if (parentClass) {
ParamDecoratorFactory.prototype = Object.create(parentClass.prototype);
}
ParamDecoratorFactory.prototype.ngMetadataName = name;
ParamDecoratorFactory.annotationCls = ParamDecoratorFactory;
return ParamDecoratorFactory;
}
export function makePropDecorator(name, props, parentClass, additionalProcessing) {
const metaCtor = makeMetadataCtor(props);
function PropDecoratorFactory(...args) {
if (this instanceof PropDecoratorFactory) {
metaCtor.apply(this, args);
return this;
}
const decoratorInstance = new PropDecoratorFactory(...args);
function PropDecorator(target, name) {
const constructor = target.constructor;
// Use of Object.defineProperty is important since it creates non-enumerable property which
// prevents the property is copied during subclassing.
const meta = constructor.hasOwnProperty(PROP_METADATA) ?
constructor[PROP_METADATA] :
Object.defineProperty(constructor, PROP_METADATA, { value: {} })[PROP_METADATA];
meta[name] = meta.hasOwnProperty(name) && meta[name] || [];
meta[name].unshift(decoratorInstance);
if (additionalProcessing)
additionalProcessing(target, name, ...args);
}
return PropDecorator;
}
if (parentClass) {
PropDecoratorFactory.prototype = Object.create(parentClass.prototype);
}
PropDecoratorFactory.prototype.ngMetadataName = name;
PropDecoratorFactory.annotationCls = PropDecoratorFactory;
return PropDecoratorFactory;
}
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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 {Type} from '../interface/type';\n\n/**\n * An interface implemented by all Angular type decorators, which allows them to be used as\n * decorators as well as Angular syntax.\n *\n * ```\n * @ng.Component({...})\n * class MyClass {...}\n * ```\n *\n * @publicApi\n */\nexport interface TypeDecorator {\n  /**\n   * Invoke as decorator.\n   */\n  <T extends Type<any>>(type: T): T;\n\n  // Make TypeDecorator assignable to built-in ParameterDecorator type.\n  // ParameterDecorator is declared in lib.d.ts as a `declare type`\n  // so we cannot declare this interface as a subtype.\n  // see https://github.com/angular/angular/issues/3379#issuecomment-126169417\n  (target: Object, propertyKey?: string|symbol, parameterIndex?: number): void;\n}\n\nexport const ANNOTATIONS = '__annotations__';\nexport const PARAMETERS = '__parameters__';\nexport const PROP_METADATA = '__prop__metadata__';\n\n/**\n * @suppress {globalThis}\n */\nexport function makeDecorator<T>(\n    name: string, props?: (...args: any[]) => any, parentClass?: any,\n    additionalProcessing?: (type: Type<T>) => void,\n    typeFn?: (type: Type<T>, ...args: any[]) => void):\n    {new (...args: any[]): any; (...args: any[]): any; (...args: any[]): (cls: any) => any;} {\n  const metaCtor = makeMetadataCtor(props);\n\n  function DecoratorFactory(\n      this: unknown | typeof DecoratorFactory, ...args: any[]): (cls: Type<T>) => any {\n    if (this instanceof DecoratorFactory) {\n      metaCtor.call(this, ...args);\n      return this as typeof DecoratorFactory;\n    }\n\n    const annotationInstance = new (DecoratorFactory as any)(...args);\n    return function TypeDecorator(cls: Type<T>) {\n      if (typeFn) typeFn(cls, ...args);\n      // Use of Object.defineProperty is important since it creates non-enumerable property which\n      // prevents the property is copied during subclassing.\n      const annotations = cls.hasOwnProperty(ANNOTATIONS) ?\n          (cls as any)[ANNOTATIONS] :\n          Object.defineProperty(cls, ANNOTATIONS, {value: []})[ANNOTATIONS];\n      annotations.push(annotationInstance);\n\n\n      if (additionalProcessing) additionalProcessing(cls);\n\n      return cls;\n    };\n  }\n\n  if (parentClass) {\n    DecoratorFactory.prototype = Object.create(parentClass.prototype);\n  }\n\n  DecoratorFactory.prototype.ngMetadataName = name;\n  (DecoratorFactory as any).annotationCls = DecoratorFactory;\n  return DecoratorFactory as any;\n}\n\nfunction makeMetadataCtor(props?: (...args: any[]) => any): any {\n  return function ctor(this: any, ...args: any[]) {\n    if (props) {\n      const values = props(...args);\n      for (const propName in values) {\n        this[propName] = values[propName];\n      }\n    }\n  };\n}\n\nexport function makeParamDecorator(\n    name: string, props?: (...args: any[]) => any, parentClass?: any): any {\n  const metaCtor = makeMetadataCtor(props);\n  function ParamDecoratorFactory(\n      this: unknown | typeof ParamDecoratorFactory, ...args: any[]): any {\n    if (this instanceof ParamDecoratorFactory) {\n      metaCtor.apply(this, args);\n      return this;\n    }\n    const annotationInstance = new (<any>ParamDecoratorFactory)(...args);\n\n    (<any>ParamDecorator).annotation = annotationInstance;\n    return ParamDecorator;\n\n    function ParamDecorator(cls: any, unusedKey: any, index: number): any {\n      // Use of Object.defineProperty is important since it creates non-enumerable property which\n      // prevents the property is copied during subclassing.\n      const parameters = cls.hasOwnProperty(PARAMETERS) ?\n          (cls as any)[PARAMETERS] :\n          Object.defineProperty(cls, PARAMETERS, {value: []})[PARAMETERS];\n\n      // there might be gaps if some in between parameters do not have annotations.\n      // we pad with nulls.\n      while (parameters.length <= index) {\n        parameters.push(null);\n      }\n\n      (parameters[index] = parameters[index] || []).push(annotationInstance);\n      return cls;\n    }\n  }\n  if (parentClass) {\n    ParamDecoratorFactory.prototype = Object.create(parentClass.prototype);\n  }\n  ParamDecoratorFactory.prototype.ngMetadataName = name;\n  (<any>ParamDecoratorFactory).annotationCls = ParamDecoratorFactory;\n  return ParamDecoratorFactory;\n}\n\nexport function makePropDecorator(\n    name: string, props?: (...args: any[]) => any, parentClass?: any,\n    additionalProcessing?: (target: any, name: string, ...args: any[]) => void): any {\n  const metaCtor = makeMetadataCtor(props);\n\n  function PropDecoratorFactory(this: unknown | typeof PropDecoratorFactory, ...args: any[]): any {\n    if (this instanceof PropDecoratorFactory) {\n      metaCtor.apply(this, args);\n      return this;\n    }\n\n    const decoratorInstance = new (<any>PropDecoratorFactory)(...args);\n\n    function PropDecorator(target: any, name: string) {\n      const constructor = target.constructor;\n      // Use of Object.defineProperty is important since it creates non-enumerable property which\n      // prevents the property is copied during subclassing.\n      const meta = constructor.hasOwnProperty(PROP_METADATA) ?\n          (constructor as any)[PROP_METADATA] :\n          Object.defineProperty(constructor, PROP_METADATA, {value: {}})[PROP_METADATA];\n      meta[name] = meta.hasOwnProperty(name) && meta[name] || [];\n      meta[name].unshift(decoratorInstance);\n\n      if (additionalProcessing) additionalProcessing(target, name, ...args);\n    }\n\n    return PropDecorator;\n  }\n\n  if (parentClass) {\n    PropDecoratorFactory.prototype = Object.create(parentClass.prototype);\n  }\n\n  PropDecoratorFactory.prototype.ngMetadataName = name;\n  (<any>PropDecoratorFactory).annotationCls = PropDecoratorFactory;\n  return PropDecoratorFactory;\n}\n"]}