@angular/core
Version:
Angular - the core framework
245 lines (244 loc) • 36.9 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 '../util/ng_dev_mode';
import { RuntimeError } from '../errors';
import { emitInjectEvent } from '../render3/debug/injector_profiler';
import { stringify } from '../util/stringify';
import { resolveForwardRef } from './forward_ref';
import { getInjectImplementation, injectRootLimpMode } from './inject_switch';
import { InjectFlags, } from './interface/injector';
const _THROW_IF_NOT_FOUND = {};
export const THROW_IF_NOT_FOUND = _THROW_IF_NOT_FOUND;
/*
* Name of a property (that we patch onto DI decorator), which is used as an annotation of which
* InjectFlag this decorator represents. This allows to avoid direct references to the DI decorators
* in the code, thus making them tree-shakable.
*/
const DI_DECORATOR_FLAG = '__NG_DI_FLAG__';
export const NG_TEMP_TOKEN_PATH = 'ngTempTokenPath';
const NG_TOKEN_PATH = 'ngTokenPath';
const NEW_LINE = /\n/gm;
const NO_NEW_LINE = 'ɵ';
export const SOURCE = '__source';
/**
* 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.
*/
let _currentInjector = undefined;
export function getCurrentInjector() {
return _currentInjector;
}
export function setCurrentInjector(injector) {
const former = _currentInjector;
_currentInjector = injector;
return former;
}
export function injectInjectorOnly(token, flags = InjectFlags.Default) {
if (_currentInjector === undefined) {
throw new RuntimeError(-203 /* RuntimeErrorCode.MISSING_INJECTION_CONTEXT */, ngDevMode &&
`inject() must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with \`runInInjectionContext\`.`);
}
else if (_currentInjector === null) {
return injectRootLimpMode(token, undefined, flags);
}
else {
const value = _currentInjector.get(token, flags & InjectFlags.Optional ? null : undefined, flags);
ngDevMode && emitInjectEvent(token, value, flags);
return value;
}
}
export function ɵɵinject(token, flags = InjectFlags.Default) {
return (getInjectImplementation() || injectInjectorOnly)(resolveForwardRef(token), flags);
}
/**
* Throws an error indicating that a factory function could not be generated by the compiler for a
* particular class.
*
* The name of the class is not mentioned here, but will be in the generated factory function name
* and thus in the stack trace.
*
* @codeGenApi
*/
export function ɵɵinvalidFactoryDep(index) {
throw new RuntimeError(202 /* RuntimeErrorCode.INVALID_FACTORY_DEPENDENCY */, ngDevMode &&
`This constructor is not compatible with Angular Dependency Injection because its dependency at index ${index} of the parameter list is invalid.
This can happen if the dependency type is a primitive like a string or if an ancestor of this class is missing an Angular decorator.
Please check that 1) the type for the parameter at index ${index} is correct and 2) the correct Angular decorators are defined for this class and its ancestors.`);
}
/**
* Injects a token from the currently active injector.
* `inject` is only supported in an [injection context](guide/di/dependency-injection-context). It
* can be used during:
* - Construction (via the `constructor`) of a class being instantiated by the DI system, such
* as an `@Injectable` or `@Component`.
* - In the initializer for fields of such classes.
* - In the factory function specified for `useFactory` of a `Provider` or an `@Injectable`.
* - In the `factory` function specified for an `InjectionToken`.
* - In a stackframe of a function call in a DI context
*
* @param token A token that represents a dependency that should 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`, `@SkipSelf`, and `@Optional`.
* @returns the injected value if operation is successful, `null` otherwise.
* @throws if called outside of a supported context.
*
* @usageNotes
* In practice the `inject()` calls are allowed in a constructor, a constructor parameter and a
* field initializer:
*
* ```typescript
* @Injectable({providedIn: 'root'})
* export class Car {
* radio: Radio|undefined;
* // OK: field initializer
* spareTyre = inject(Tyre);
*
* constructor() {
* // OK: constructor body
* this.radio = inject(Radio);
* }
* }
* ```
*
* It is also legal to call `inject` from a provider's factory:
*
* ```typescript
* providers: [
* {provide: Car, useFactory: () => {
* // OK: a class factory
* const engine = inject(Engine);
* return new Car(engine);
* }}
* ]
* ```
*
* Calls to the `inject()` function outside of the class creation context will result in error. Most
* notably, calls to `inject()` are disallowed after a class instance was created, in methods
* (including lifecycle hooks):
*
* ```typescript
* @Component({ ... })
* export class CarComponent {
* ngOnInit() {
* // ERROR: too late, the component instance was already created
* const engine = inject(Engine);
* engine.start();
* }
* }
* ```
*
* @publicApi
*/
export function inject(token, flags = InjectFlags.Default) {
// The `as any` here _shouldn't_ be necessary, but without it JSCompiler
// throws a disambiguation error due to the multiple signatures.
return ɵɵinject(token, convertToBitFlags(flags));
}
// Converts object-based DI flags (`InjectOptions`) to bit flags (`InjectFlags`).
export function convertToBitFlags(flags) {
if (typeof flags === 'undefined' || typeof flags === 'number') {
return flags;
}
// While TypeScript doesn't accept it without a cast, bitwise OR with false-y values in
// JavaScript is a no-op. We can use that for a very codesize-efficient conversion from
// `InjectOptions` to `InjectFlags`.
return (0 /* InternalInjectFlags.Default */ | // comment to force a line break in the formatter
(flags.optional && 8 /* InternalInjectFlags.Optional */) |
(flags.host && 1 /* InternalInjectFlags.Host */) |
(flags.self && 2 /* InternalInjectFlags.Self */) |
(flags.skipSelf && 4 /* InternalInjectFlags.SkipSelf */));
}
export function injectArgs(types) {
const args = [];
for (let i = 0; i < types.length; i++) {
const arg = resolveForwardRef(types[i]);
if (Array.isArray(arg)) {
if (arg.length === 0) {
throw new RuntimeError(900 /* RuntimeErrorCode.INVALID_DIFFER_INPUT */, ngDevMode && 'Arguments array must have arguments.');
}
let type = undefined;
let flags = InjectFlags.Default;
for (let j = 0; j < arg.length; j++) {
const meta = arg[j];
const flag = getInjectFlag(meta);
if (typeof flag === 'number') {
// Special case when we handle @Inject decorator.
if (flag === -1 /* DecoratorFlags.Inject */) {
type = meta.token;
}
else {
flags |= flag;
}
}
else {
type = meta;
}
}
args.push(ɵɵinject(type, flags));
}
else {
args.push(ɵɵinject(arg));
}
}
return args;
}
/**
* Attaches a given InjectFlag to a given decorator using monkey-patching.
* Since DI decorators can be used in providers `deps` array (when provider is configured using
* `useFactory`) without initialization (e.g. `Host`) and as an instance (e.g. `new Host()`), we
* attach the flag to make it available both as a static property and as a field on decorator
* instance.
*
* @param decorator Provided DI decorator.
* @param flag InjectFlag that should be applied.
*/
export function attachInjectFlag(decorator, flag) {
decorator[DI_DECORATOR_FLAG] = flag;
decorator.prototype[DI_DECORATOR_FLAG] = flag;
return decorator;
}
/**
* Reads monkey-patched property that contains InjectFlag attached to a decorator.
*
* @param token Token that may contain monkey-patched DI flags property.
*/
export function getInjectFlag(token) {
return token[DI_DECORATOR_FLAG];
}
export function catchInjectorError(e, token, injectorErrorName, source) {
const 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 = null) {
text = text && text.charAt(0) === '\n' && text.charAt(1) == NO_NEW_LINE ? text.slice(2) : text;
let context = stringify(obj);
if (Array.isArray(obj)) {
context = obj.map(stringify).join(' -> ');
}
else if (typeof obj === 'object') {
let parts = [];
for (let key in obj) {
if (obj.hasOwnProperty(key)) {
let 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 ')}`;
}
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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 '../util/ng_dev_mode';\n\nimport {RuntimeError, RuntimeErrorCode} from '../errors';\nimport {Type} from '../interface/type';\nimport {emitInjectEvent} from '../render3/debug/injector_profiler';\nimport {stringify} from '../util/stringify';\n\nimport {resolveForwardRef} from './forward_ref';\nimport {getInjectImplementation, injectRootLimpMode} from './inject_switch';\nimport type {Injector} from './injector';\nimport {\n  DecoratorFlags,\n  InjectFlags,\n  InjectOptions,\n  InternalInjectFlags,\n} from './interface/injector';\nimport {ProviderToken} from './provider_token';\nimport type {HostAttributeToken} from './host_attribute_token';\n\nconst _THROW_IF_NOT_FOUND = {};\nexport const THROW_IF_NOT_FOUND = _THROW_IF_NOT_FOUND;\n\n/*\n * Name of a property (that we patch onto DI decorator), which is used as an annotation of which\n * InjectFlag this decorator represents. This allows to avoid direct references to the DI decorators\n * in the code, thus making them tree-shakable.\n */\nconst DI_DECORATOR_FLAG = '__NG_DI_FLAG__';\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\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 getCurrentInjector(): Injector | undefined | null {\n  return _currentInjector;\n}\n\nexport function setCurrentInjector(\n  injector: Injector | null | undefined,\n): Injector | undefined | null {\n  const former = _currentInjector;\n  _currentInjector = injector;\n  return former;\n}\n\nexport function injectInjectorOnly<T>(token: ProviderToken<T>): T;\nexport function injectInjectorOnly<T>(token: ProviderToken<T>, flags?: InjectFlags): T | null;\nexport function injectInjectorOnly<T>(\n  token: ProviderToken<T>,\n  flags = InjectFlags.Default,\n): T | null {\n  if (_currentInjector === undefined) {\n    throw new RuntimeError(\n      RuntimeErrorCode.MISSING_INJECTION_CONTEXT,\n      ngDevMode &&\n        `inject() must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with \\`runInInjectionContext\\`.`,\n    );\n  } else if (_currentInjector === null) {\n    return injectRootLimpMode(token, undefined, flags);\n  } else {\n    const value = _currentInjector.get(\n      token,\n      flags & InjectFlags.Optional ? null : undefined,\n      flags,\n    );\n    ngDevMode && emitInjectEvent(token as Type<unknown>, value, flags);\n    return value;\n  }\n}\n\n/**\n * Generated instruction: injects a token from the currently active injector.\n *\n * (Additional documentation moved to `inject`, as it is the public API, and an alias for this\n * instruction)\n *\n * @see inject\n * @codeGenApi\n * @publicApi This instruction has been emitted by ViewEngine for some time and is deployed to npm.\n */\nexport function ɵɵinject<T>(token: ProviderToken<T>): T;\nexport function ɵɵinject<T>(token: ProviderToken<T>, flags?: InjectFlags): T | null;\nexport function ɵɵinject(token: HostAttributeToken): string;\nexport function ɵɵinject(token: HostAttributeToken, flags?: InjectFlags): string | null;\nexport function ɵɵinject<T>(\n  token: ProviderToken<T> | HostAttributeToken,\n  flags?: InjectFlags,\n): string | null;\nexport function ɵɵinject<T>(\n  token: ProviderToken<T> | HostAttributeToken,\n  flags = InjectFlags.Default,\n): T | null {\n  return (getInjectImplementation() || injectInjectorOnly)(\n    resolveForwardRef(token as Type<T>),\n    flags,\n  );\n}\n\n/**\n * Throws an error indicating that a factory function could not be generated by the compiler for a\n * particular class.\n *\n * The name of the class is not mentioned here, but will be in the generated factory function name\n * and thus in the stack trace.\n *\n * @codeGenApi\n */\nexport function ɵɵinvalidFactoryDep(index: number): never {\n  throw new RuntimeError(\n    RuntimeErrorCode.INVALID_FACTORY_DEPENDENCY,\n    ngDevMode &&\n      `This constructor is not compatible with Angular Dependency Injection because its dependency at index ${index} of the parameter list is invalid.\nThis can happen if the dependency type is a primitive like a string or if an ancestor of this class is missing an Angular decorator.\n\nPlease check that 1) the type for the parameter at index ${index} is correct and 2) the correct Angular decorators are defined for this class and its ancestors.`,\n  );\n}\n\n/**\n * @param token A token that represents a dependency that should be injected.\n * @returns the injected value if operation is successful, `null` otherwise.\n * @throws if called outside of a supported context.\n *\n * @publicApi\n */\nexport function inject<T>(token: ProviderToken<T>): T;\n/**\n * @param token A token that represents a dependency that should be injected.\n * @param flags Control how injection is executed. The flags correspond to injection strategies that\n *     can be specified with parameter decorators `@Host`, `@Self`, `@SkipSelf`, and `@Optional`.\n * @returns the injected value if operation is successful, `null` otherwise.\n * @throws if called outside of a supported context.\n *\n * @publicApi\n * @deprecated prefer an options object instead of `InjectFlags`\n */\nexport function inject<T>(token: ProviderToken<T>, flags?: InjectFlags): T | null;\n/**\n * @param token A token that represents a dependency that should be injected.\n * @param options Control how injection is executed. Options correspond to injection strategies\n *     that can be specified with parameter decorators `@Host`, `@Self`, `@SkipSelf`, and\n *     `@Optional`.\n * @returns the injected value if operation is successful.\n * @throws if called outside of a supported context, or if the token is not found.\n *\n * @publicApi\n */\nexport function inject<T>(token: ProviderToken<T>, options: InjectOptions & {optional?: false}): T;\n/**\n * @param token A token that represents a dependency that should be injected.\n * @param options Control how injection is executed. Options correspond to injection strategies\n *     that can be specified with parameter decorators `@Host`, `@Self`, `@SkipSelf`, and\n *     `@Optional`.\n * @returns the injected value if operation is successful,  `null` if the token is not\n *     found and optional injection has been requested.\n * @throws if called outside of a supported context, or if the token is not found and optional\n *     injection was not requested.\n *\n * @publicApi\n */\nexport function inject<T>(token: ProviderToken<T>, options: InjectOptions): T | null;\n/**\n * @param token A token that represents a static attribute on the host node that should be injected.\n * @returns Value of the attribute if it exists.\n * @throws If called outside of a supported context or the attribute does not exist.\n *\n * @publicApi\n */\nexport function inject(token: HostAttributeToken): string;\n/**\n * @param token A token that represents a static attribute on the host node that should be injected.\n * @returns Value of the attribute if it exists, otherwise `null`.\n * @throws If called outside of a supported context.\n *\n * @publicApi\n */\nexport function inject(token: HostAttributeToken, options: {optional: true}): string | null;\n/**\n * @param token A token that represents a static attribute on the host node that should be injected.\n * @returns Value of the attribute if it exists.\n * @throws If called outside of a supported context or the attribute does not exist.\n *\n * @publicApi\n */\nexport function inject(token: HostAttributeToken, options: {optional: false}): string;\n/**\n * Injects a token from the currently active injector.\n * `inject` is only supported in an [injection context](guide/di/dependency-injection-context). It\n * can be used during:\n * - Construction (via the `constructor`) of a class being instantiated by the DI system, such\n * as an `@Injectable` or `@Component`.\n * - In the initializer for fields of such classes.\n * - In the factory function specified for `useFactory` of a `Provider` or an `@Injectable`.\n * - In the `factory` function specified for an `InjectionToken`.\n * - In a stackframe of a function call in a DI context\n *\n * @param token A token that represents a dependency that should 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`, `@SkipSelf`, and `@Optional`.\n * @returns the injected value if operation is successful, `null` otherwise.\n * @throws if called outside of a supported context.\n *\n * @usageNotes\n * In practice the `inject()` calls are allowed in a constructor, a constructor parameter and a\n * field initializer:\n *\n * ```typescript\n * @Injectable({providedIn: 'root'})\n * export class Car {\n *   radio: Radio|undefined;\n *   // OK: field initializer\n *   spareTyre = inject(Tyre);\n *\n *   constructor() {\n *     // OK: constructor body\n *     this.radio = inject(Radio);\n *   }\n * }\n * ```\n *\n * It is also legal to call `inject` from a provider's factory:\n *\n * ```typescript\n * providers: [\n *   {provide: Car, useFactory: () => {\n *     // OK: a class factory\n *     const engine = inject(Engine);\n *     return new Car(engine);\n *   }}\n * ]\n * ```\n *\n * Calls to the `inject()` function outside of the class creation context will result in error. Most\n * notably, calls to `inject()` are disallowed after a class instance was created, in methods\n * (including lifecycle hooks):\n *\n * ```typescript\n * @Component({ ... })\n * export class CarComponent {\n *   ngOnInit() {\n *     // ERROR: too late, the component instance was already created\n *     const engine = inject(Engine);\n *     engine.start();\n *   }\n * }\n * ```\n *\n * @publicApi\n */\nexport function inject<T>(\n  token: ProviderToken<T> | HostAttributeToken,\n  flags: InjectFlags | InjectOptions = InjectFlags.Default,\n) {\n  // The `as any` here _shouldn't_ be necessary, but without it JSCompiler\n  // throws a disambiguation  error due to the multiple signatures.\n  return ɵɵinject(token as any, convertToBitFlags(flags));\n}\n\n// Converts object-based DI flags (`InjectOptions`) to bit flags (`InjectFlags`).\nexport function convertToBitFlags(\n  flags: InjectOptions | InjectFlags | undefined,\n): InjectFlags | undefined {\n  if (typeof flags === 'undefined' || typeof flags === 'number') {\n    return flags;\n  }\n\n  // While TypeScript doesn't accept it without a cast, bitwise OR with false-y values in\n  // JavaScript is a no-op. We can use that for a very codesize-efficient conversion from\n  // `InjectOptions` to `InjectFlags`.\n  return (InternalInjectFlags.Default | // comment to force a line break in the formatter\n    ((flags.optional && InternalInjectFlags.Optional) as number) |\n    ((flags.host && InternalInjectFlags.Host) as number) |\n    ((flags.self && InternalInjectFlags.Self) as number) |\n    ((flags.skipSelf && InternalInjectFlags.SkipSelf) as number)) as InjectFlags;\n}\n\nexport function injectArgs(types: (ProviderToken<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 RuntimeError(\n          RuntimeErrorCode.INVALID_DIFFER_INPUT,\n          ngDevMode && 'Arguments array must have arguments.',\n        );\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        const flag = getInjectFlag(meta);\n        if (typeof flag === 'number') {\n          // Special case when we handle @Inject decorator.\n          if (flag === DecoratorFlags.Inject) {\n            type = meta.token;\n          } else {\n            flags |= flag;\n          }\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/**\n * Attaches a given InjectFlag to a given decorator using monkey-patching.\n * Since DI decorators can be used in providers `deps` array (when provider is configured using\n * `useFactory`) without initialization (e.g. `Host`) and as an instance (e.g. `new Host()`), we\n * attach the flag to make it available both as a static property and as a field on decorator\n * instance.\n *\n * @param decorator Provided DI decorator.\n * @param flag InjectFlag that should be applied.\n */\nexport function attachInjectFlag(decorator: any, flag: InternalInjectFlags | DecoratorFlags): any {\n  decorator[DI_DECORATOR_FLAG] = flag;\n  decorator.prototype[DI_DECORATOR_FLAG] = flag;\n  return decorator;\n}\n\n/**\n * Reads monkey-patched property that contains InjectFlag attached to a decorator.\n *\n * @param token Token that may contain monkey-patched DI flags property.\n */\nexport function getInjectFlag(token: any): number | undefined {\n  return token[DI_DECORATOR_FLAG];\n}\n\nexport function catchInjectorError(\n  e: any,\n  token: any,\n  injectorErrorName: string,\n  source: string | null,\n): 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,\n  obj: any,\n  injectorErrorName: string,\n  source: string | null = null,\n): string {\n  text = text && text.charAt(0) === '\\n' && text.charAt(1) == NO_NEW_LINE ? text.slice(2) : text;\n  let context = stringify(obj);\n  if (Array.isArray(obj)) {\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    }\n    context = `{${parts.join(', ')}}`;\n  }\n  return `${injectorErrorName}${source ? '(' + source + ')' : ''}[${context}]: ${text.replace(\n    NEW_LINE,\n    '\\n  ',\n  )}`;\n}\n"]}