@angular/core
Version:
Angular - the core framework
185 lines (184 loc) • 25.1 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 { getClosureSafeProperty } from '../util/property';
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';
export const USE_VALUE = getClosureSafeProperty({ provide: String, useValue: getClosureSafeProperty });
/**
* 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 setCurrentInjector(injector) {
const former = _currentInjector;
_currentInjector = injector;
return former;
}
export function injectInjectorOnly(token, 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 = 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.
*
* This instruction allows the actual error message to be optimized away when ngDevMode is turned
* off, saving bytes of generated code while still providing a good experience in dev mode.
*
* 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) {
const msg = 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.` :
'invalid';
throw new Error(msg);
}
/**
* 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 the injected value if injection is successful, `null` otherwise.
*
* @usageNotes
*
* ### Example
*
* {@example core/di/ts/injector_spec.ts region='ShakableInjectionToken'}
*
* @publicApi
*/
export const inject = ɵɵinject;
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 Error('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 /* 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.substr(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 {Type} from '../interface/type';\nimport {getClosureSafeProperty} from '../util/property';\nimport {stringify} from '../util/stringify';\n\nimport {resolveForwardRef} from './forward_ref';\nimport {getInjectImplementation, injectRootLimpMode} from './inject_switch';\nimport {Injector} from './injector';\nimport {DecoratorFlags, InjectFlags, InternalInjectFlags} from './interface/injector';\nimport {ValueProvider} from './interface/provider';\nimport {ProviderToken} from './provider_token';\n\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\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\nexport function injectInjectorOnly<T>(token: ProviderToken<T>): T;\nexport function injectInjectorOnly<T>(token: ProviderToken<T>, flags?: InjectFlags): T|null;\nexport function injectInjectorOnly<T>(token: ProviderToken<T>, flags = InjectFlags.Default): T|\n    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\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<T>(token: ProviderToken<T>, flags = InjectFlags.Default): T|null {\n  return (getInjectImplementation() || injectInjectorOnly)(resolveForwardRef(token), flags);\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 * This instruction allows the actual error message to be optimized away when ngDevMode is turned\n * off, saving bytes of generated code while still providing a good experience in dev mode.\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  const msg = ngDevMode ?\n      `This constructor is not compatible with Angular Dependency Injection because its dependency at index ${\n          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 ${\n          index} is correct and 2) the correct Angular decorators are defined for this class and its ancestors.` :\n      'invalid';\n  throw new Error(msg);\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 the injected value 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\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 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        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, 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 (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    context = `{${parts.join(', ')}}`;\n  }\n  return `${injectorErrorName}${source ? '(' + source + ')' : ''}[${context}]: ${\n      text.replace(NEW_LINE, '\\n  ')}`;\n}\n"]}