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@angular/core

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Angular - the core framework

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/** * @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 */ import { getClosureSafeProperty } from '../util/property'; import { stringify } from '../util/stringify'; import { resolveForwardRef } from './forward_ref'; import { InjectionToken } from './injection_token'; import { getInjectableDef } from './interface/defs'; import { InjectFlags } from './interface/injector'; import { Inject, Optional, Self, SkipSelf } from './metadata'; /** * An InjectionToken that gets the current `Injector` for `createInjector()`-style injectors. * * Requesting this token instead of `Injector` allows `StaticInjector` to be tree-shaken from a * project. * * @publicApi */ export var INJECTOR = new InjectionToken('INJECTOR', -1 // `-1` is used by Ivy DI system as special value to recognize it as `Injector`. ); var _THROW_IF_NOT_FOUND = new Object(); export var THROW_IF_NOT_FOUND = _THROW_IF_NOT_FOUND; export var NG_TEMP_TOKEN_PATH = 'ngTempTokenPath'; var NG_TOKEN_PATH = 'ngTokenPath'; var NEW_LINE = /\n/gm; var NO_NEW_LINE = 'ɵ'; export var SOURCE = '__source'; var ɵ0 = getClosureSafeProperty; export var USE_VALUE = getClosureSafeProperty({ provide: String, useValue: ɵ0 }); /** * Current injector value used by `inject`. * - `undefined`: it is an error to call `inject` * - `null`: `inject` can be called but there is no injector (limp-mode). * - Injector instance: Use the injector for resolution. */ var _currentInjector = undefined; export function setCurrentInjector(injector) { var former = _currentInjector; _currentInjector = injector; return former; } /** * Current implementation of inject. * * By default, it is `injectInjectorOnly`, which makes it `Injector`-only aware. It can be changed * to `directiveInject`, which brings in the `NodeInjector` system of ivy. It is designed this * way for two reasons: * 1. `Injector` should not depend on ivy logic. * 2. To maintain tree shake-ability we don't want to bring in unnecessary code. */ var _injectImplementation; /** * Sets the current inject implementation. */ export function setInjectImplementation(impl) { var previous = _injectImplementation; _injectImplementation = impl; return previous; } export function injectInjectorOnly(token, flags) { if (flags === void 0) { flags = InjectFlags.Default; } if (_currentInjector === undefined) { throw new Error("inject() must be called from an injection context"); } else if (_currentInjector === null) { return injectRootLimpMode(token, undefined, flags); } else { return _currentInjector.get(token, flags & InjectFlags.Optional ? null : undefined, flags); } } export function ɵɵinject(token, flags) { if (flags === void 0) { flags = InjectFlags.Default; } return (_injectImplementation || injectInjectorOnly)(token, flags); } /** * Injects a token from the currently active injector. * * Must be used in the context of a factory function such as one defined for an * `InjectionToken`. Throws an error if not called from such a context. * * Within such a factory function, using this function to request injection of a dependency * is faster and more type-safe than providing an additional array of dependencies * (as has been common with `useFactory` providers). * * @param token The injection token for the dependency to be injected. * @param flags Optional flags that control how injection is executed. * The flags correspond to injection strategies that can be specified with * parameter decorators `@Host`, `@Self`, `@SkipSef`, and `@Optional`. * @returns True if injection is successful, null otherwise. * * @usageNotes * * ### Example * * {@example core/di/ts/injector_spec.ts region='ShakableInjectionToken'} * * @publicApi */ export var inject = ɵɵinject; /** * Injects `root` tokens in limp mode. * * If no injector exists, we can still inject tree-shakable providers which have `providedIn` set to * `"root"`. This is known as the limp mode injection. In such case the value is stored in the * `InjectableDef`. */ export function injectRootLimpMode(token, notFoundValue, flags) { var injectableDef = getInjectableDef(token); if (injectableDef && injectableDef.providedIn == 'root') { return injectableDef.value === undefined ? injectableDef.value = injectableDef.factory() : injectableDef.value; } if (flags & InjectFlags.Optional) return null; if (notFoundValue !== undefined) return notFoundValue; throw new Error("Injector: NOT_FOUND [" + stringify(token) + "]"); } export function injectArgs(types) { var args = []; for (var i = 0; i < types.length; i++) { var arg = resolveForwardRef(types[i]); if (Array.isArray(arg)) { if (arg.length === 0) { throw new Error('Arguments array must have arguments.'); } var type = undefined; var flags = InjectFlags.Default; for (var j = 0; j < arg.length; j++) { var meta = arg[j]; if (meta instanceof Optional || meta.ngMetadataName === 'Optional' || meta === Optional) { flags |= InjectFlags.Optional; } else if (meta instanceof SkipSelf || meta.ngMetadataName === 'SkipSelf' || meta === SkipSelf) { flags |= InjectFlags.SkipSelf; } else if (meta instanceof Self || meta.ngMetadataName === 'Self' || meta === Self) { flags |= InjectFlags.Self; } else if (meta instanceof Inject || meta === Inject) { type = meta.token; } else { type = meta; } } args.push(ɵɵinject(type, flags)); } else { args.push(ɵɵinject(arg)); } } return args; } var NullInjector = /** @class */ (function () { function NullInjector() { } NullInjector.prototype.get = function (token, notFoundValue) { if (notFoundValue === void 0) { notFoundValue = THROW_IF_NOT_FOUND; } if (notFoundValue === THROW_IF_NOT_FOUND) { // Intentionally left behind: With dev tools open the debugger will stop here. There is no // reason why correctly written application should cause this exception. // TODO(misko): uncomment the next line once `ngDevMode` works with closure. // if(ngDevMode) debugger; var error = new Error("NullInjectorError: No provider for " + stringify(token) + "!"); error.name = 'NullInjectorError'; throw error; } return notFoundValue; }; return NullInjector; }()); export { NullInjector }; export function catchInjectorError(e, token, injectorErrorName, source) { var tokenPath = e[NG_TEMP_TOKEN_PATH]; if (token[SOURCE]) { tokenPath.unshift(token[SOURCE]); } e.message = formatError('\n' + e.message, tokenPath, injectorErrorName, source); e[NG_TOKEN_PATH] = tokenPath; e[NG_TEMP_TOKEN_PATH] = null; throw e; } export function formatError(text, obj, injectorErrorName, source) { if (source === void 0) { source = null; } text = text && text.charAt(0) === '\n' && text.charAt(1) == NO_NEW_LINE ? text.substr(2) : text; var context = stringify(obj); if (obj instanceof Array) { context = obj.map(stringify).join(' -> '); } else if (typeof obj === 'object') { var parts = []; for (var key in obj) { if (obj.hasOwnProperty(key)) { var value = obj[key]; parts.push(key + ':' + (typeof value === 'string' ? JSON.stringify(value) : stringify(value))); } } context = "{" + parts.join(', ') + "}"; } return "" + injectorErrorName + (source ? '(' + source + ')' : '') + "[" + context + "]: " + text.replace(NEW_LINE, '\n '); } export { ɵ0 }; //# 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* @license\n * Copyright Google Inc. 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';\nimport {getClosureSafeProperty} from '../util/property';\nimport {stringify} from '../util/stringify';\n\nimport {resolveForwardRef} from './forward_ref';\nimport {InjectionToken} from './injection_token';\nimport {Injector} from './injector';\nimport {getInjectableDef, ɵɵInjectableDef} from './interface/defs';\nimport {InjectFlags} from './interface/injector';\nimport {ValueProvider} from './interface/provider';\nimport {Inject, Optional, Self, SkipSelf} from './metadata';\n\n\n\n/**\n * An InjectionToken that gets the current `Injector` for `createInjector()`-style injectors.\n *\n * Requesting this token instead of `Injector` allows `StaticInjector` to be tree-shaken from a\n * project.\n *\n * @publicApi\n */\nexport const INJECTOR = new InjectionToken<Injector>(\n    'INJECTOR',\n    -1 as any  // `-1` is used by Ivy DI system as special value to recognize it as `Injector`.\n    );\n\nconst _THROW_IF_NOT_FOUND = new Object();\nexport const THROW_IF_NOT_FOUND = _THROW_IF_NOT_FOUND;\n\nexport const NG_TEMP_TOKEN_PATH = 'ngTempTokenPath';\nconst NG_TOKEN_PATH = 'ngTokenPath';\nconst NEW_LINE = /\\n/gm;\nconst NO_NEW_LINE = 'ɵ';\nexport const SOURCE = '__source';\n\nexport const USE_VALUE =\n    getClosureSafeProperty<ValueProvider>({provide: String, useValue: getClosureSafeProperty});\n\n/**\n * Current injector value used by `inject`.\n * - `undefined`: it is an error to call `inject`\n * - `null`: `inject` can be called but there is no injector (limp-mode).\n * - Injector instance: Use the injector for resolution.\n */\nlet _currentInjector: Injector|undefined|null = undefined;\n\nexport function setCurrentInjector(injector: Injector | null | undefined): Injector|undefined|null {\n  const former = _currentInjector;\n  _currentInjector = injector;\n  return former;\n}\n\n/**\n * Current implementation of inject.\n *\n * By default, it is `injectInjectorOnly`, which makes it `Injector`-only aware. It can be changed\n * to `directiveInject`, which brings in the `NodeInjector` system of ivy. It is designed this\n * way for two reasons:\n *  1. `Injector` should not depend on ivy logic.\n *  2. To maintain tree shake-ability we don't want to bring in unnecessary code.\n */\nlet _injectImplementation: (<T>(token: Type<T>| InjectionToken<T>, flags: InjectFlags) => T | null)|\n    undefined;\n\n/**\n * Sets the current inject implementation.\n */\nexport function setInjectImplementation(\n    impl: (<T>(token: Type<T>| InjectionToken<T>, flags?: InjectFlags) => T | null) | undefined):\n    (<T>(token: Type<T>| InjectionToken<T>, flags?: InjectFlags) => T | null)|undefined {\n  const previous = _injectImplementation;\n  _injectImplementation = impl;\n  return previous;\n}\n\nexport function injectInjectorOnly<T>(token: Type<T>| InjectionToken<T>): T;\nexport function injectInjectorOnly<T>(token: Type<T>| InjectionToken<T>, flags?: InjectFlags): T|\n    null;\nexport function injectInjectorOnly<T>(\n    token: Type<T>| InjectionToken<T>, flags = InjectFlags.Default): T|null {\n  if (_currentInjector === undefined) {\n    throw new Error(`inject() must be called from an injection context`);\n  } else if (_currentInjector === null) {\n    return injectRootLimpMode(token, undefined, flags);\n  } else {\n    return _currentInjector.get(token, flags & InjectFlags.Optional ? null : undefined, flags);\n  }\n}\n\n/**\n * Generated instruction: Injects a token from the currently active injector.\n *\n * Must be used in the context of a factory function such as one defined for an\n * `InjectionToken`. Throws an error if not called from such a context.\n *\n * (Additional documentation moved to `inject`, as it is the public API, and an alias for this instruction)\n *\n * @see inject\n * @codeGenApi\n */\nexport function ɵɵinject<T>(token: Type<T>| InjectionToken<T>): T;\nexport function ɵɵinject<T>(token: Type<T>| InjectionToken<T>, flags?: InjectFlags): T|null;\nexport function ɵɵinject<T>(token: Type<T>| InjectionToken<T>, flags = InjectFlags.Default): T|\n    null {\n  return (_injectImplementation || injectInjectorOnly)(token, flags);\n}\n\n/**\n * Injects a token from the currently active injector.\n *\n * Must be used in the context of a factory function such as one defined for an\n * `InjectionToken`. Throws an error if not called from such a context.\n *\n * Within such a factory function, using this function to request injection of a dependency\n * is faster and more type-safe than providing an additional array of dependencies\n * (as has been common with `useFactory` providers).\n *\n * @param token The injection token for the dependency to be injected.\n * @param flags Optional flags that control how injection is executed.\n * The flags correspond to injection strategies that can be specified with\n * parameter decorators `@Host`, `@Self`, `@SkipSef`, and `@Optional`.\n * @returns True if injection is successful, null otherwise.\n *\n * @usageNotes\n *\n * ### Example\n *\n * {@example core/di/ts/injector_spec.ts region='ShakableInjectionToken'}\n *\n * @publicApi\n */\nexport const inject = ɵɵinject;\n\n/**\n * Injects `root` tokens in limp mode.\n *\n * If no injector exists, we can still inject tree-shakable providers which have `providedIn` set to\n * `\"root\"`. This is known as the limp mode injection. In such case the value is stored in the\n * `InjectableDef`.\n */\nexport function injectRootLimpMode<T>(\n    token: Type<T>| InjectionToken<T>, notFoundValue: T | undefined, flags: InjectFlags): T|null {\n  const injectableDef: ɵɵInjectableDef<T>|null = getInjectableDef(token);\n  if (injectableDef && injectableDef.providedIn == 'root') {\n    return injectableDef.value === undefined ? injectableDef.value = injectableDef.factory() :\n                                               injectableDef.value;\n  }\n  if (flags & InjectFlags.Optional) return null;\n  if (notFoundValue !== undefined) return notFoundValue;\n  throw new Error(`Injector: NOT_FOUND [${stringify(token)}]`);\n}\n\nexport function injectArgs(types: (Type<any>| InjectionToken<any>| any[])[]): any[] {\n  const args: any[] = [];\n  for (let i = 0; i < types.length; i++) {\n    const arg = resolveForwardRef(types[i]);\n    if (Array.isArray(arg)) {\n      if (arg.length === 0) {\n        throw new Error('Arguments array must have arguments.');\n      }\n      let type: Type<any>|undefined = undefined;\n      let flags: InjectFlags = InjectFlags.Default;\n\n      for (let j = 0; j < arg.length; j++) {\n        const meta = arg[j];\n        if (meta instanceof Optional || meta.ngMetadataName === 'Optional' || meta === Optional) {\n          flags |= InjectFlags.Optional;\n        } else if (\n            meta instanceof SkipSelf || meta.ngMetadataName === 'SkipSelf' || meta === SkipSelf) {\n          flags |= InjectFlags.SkipSelf;\n        } else if (meta instanceof Self || meta.ngMetadataName === 'Self' || meta === Self) {\n          flags |= InjectFlags.Self;\n        } else if (meta instanceof Inject || meta === Inject) {\n          type = meta.token;\n        } else {\n          type = meta;\n        }\n      }\n\n      args.push(ɵɵinject(type !, flags));\n    } else {\n      args.push(ɵɵinject(arg));\n    }\n  }\n  return args;\n}\n\n\nexport class NullInjector implements Injector {\n  get(token: any, notFoundValue: any = THROW_IF_NOT_FOUND): any {\n    if (notFoundValue === THROW_IF_NOT_FOUND) {\n      // Intentionally left behind: With dev tools open the debugger will stop here. There is no\n      // reason why correctly written application should cause this exception.\n      // TODO(misko): uncomment the next line once `ngDevMode` works with closure.\n      // if(ngDevMode) debugger;\n      const error = new Error(`NullInjectorError: No provider for ${stringify(token)}!`);\n      error.name = 'NullInjectorError';\n      throw error;\n    }\n    return notFoundValue;\n  }\n}\n\n\nexport function catchInjectorError(\n    e: any, token: any, injectorErrorName: string, source: string | null): never {\n  const tokenPath: any[] = e[NG_TEMP_TOKEN_PATH];\n  if (token[SOURCE]) {\n    tokenPath.unshift(token[SOURCE]);\n  }\n  e.message = formatError('\\n' + e.message, tokenPath, injectorErrorName, source);\n  e[NG_TOKEN_PATH] = tokenPath;\n  e[NG_TEMP_TOKEN_PATH] = null;\n  throw e;\n}\n\nexport function formatError(\n    text: string, obj: any, injectorErrorName: string, source: string | null = null): string {\n  text = text && text.charAt(0) === '\\n' && text.charAt(1) == NO_NEW_LINE ? text.substr(2) : text;\n  let context = stringify(obj);\n  if (obj instanceof Array) {\n    context = obj.map(stringify).join(' -> ');\n  } else if (typeof obj === 'object') {\n    let parts = <string[]>[];\n    for (let key in obj) {\n      if (obj.hasOwnProperty(key)) {\n        let value = obj[key];\n        parts.push(\n            key + ':' + (typeof value === 'string' ? JSON.stringify(value) : stringify(value)));\n      }\n    }\n    context = `{${parts.join(', ')}}`;\n  }\n  return `${injectorErrorName}${source ? '(' + source + ')' : ''}[${context}]: ${text.replace(NEW_LINE, '\\n  ')}`;\n}\n"]}