112 lines
3.7 KiB
TypeScript
112 lines
3.7 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {InjectFlags} from './core';
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import {Identifiers} from './identifiers';
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import * as o from './output/output_ast';
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import {R3DependencyMetadata, R3FactoryDelegateType, R3FactoryMetadata, compileFactoryFunction} from './render3/r3_factory';
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import {mapToMapExpression} from './render3/util';
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export interface InjectableDef {
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expression: o.Expression;
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type: o.Type;
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statements: o.Statement[];
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}
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export interface R3InjectableMetadata {
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name: string;
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type: o.Expression;
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ctorDeps: R3DependencyMetadata[]|null;
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providedIn: o.Expression;
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useClass?: o.Expression;
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useFactory?: o.Expression;
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useExisting?: o.Expression;
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useValue?: o.Expression;
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userDeps?: R3DependencyMetadata[];
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}
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export function compileInjectable(meta: R3InjectableMetadata): InjectableDef {
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let result: {factory: o.Expression, statements: o.Statement[]}|null = null;
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function makeFn(ret: o.Expression): o.Expression {
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return o.fn([], [new o.ReturnStatement(ret)], undefined, undefined, `${meta.name}_Factory`);
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}
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const factoryMeta = {
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name: meta.name,
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type: meta.type,
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deps: meta.ctorDeps,
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injectFn: Identifiers.inject,
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};
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if (meta.useClass !== undefined) {
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// meta.useClass has two modes of operation. Either deps are specified, in which case `new` is
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// used to instantiate the class with dependencies injected, or deps are not specified and
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// the factory of the class is used to instantiate it.
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//
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// A special case exists for useClass: Type where Type is the injectable type itself, in which
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// case omitting deps just uses the constructor dependencies instead.
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const useClassOnSelf = meta.useClass.isEquivalent(meta.type);
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const deps = meta.userDeps || (useClassOnSelf && meta.ctorDeps) || undefined;
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if (deps !== undefined) {
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// factory: () => new meta.useClass(...deps)
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result = compileFactoryFunction({
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...factoryMeta,
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delegate: meta.useClass,
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delegateDeps: deps,
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delegateType: R3FactoryDelegateType.Class,
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});
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} else {
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result = compileFactoryFunction({
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...factoryMeta,
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delegate: meta.useClass,
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delegateType: R3FactoryDelegateType.Factory,
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});
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}
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} else if (meta.useFactory !== undefined) {
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result = compileFactoryFunction({
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...factoryMeta,
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delegate: meta.useFactory,
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delegateDeps: meta.userDeps || [],
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delegateType: R3FactoryDelegateType.Function,
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});
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} else if (meta.useValue !== undefined) {
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// Note: it's safe to use `meta.useValue` instead of the `USE_VALUE in meta` check used for
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// client code because meta.useValue is an Expression which will be defined even if the actual
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// value is undefined.
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result = compileFactoryFunction({
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...factoryMeta,
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expression: meta.useValue,
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});
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} else if (meta.useExisting !== undefined) {
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// useExisting is an `inject` call on the existing token.
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result = compileFactoryFunction({
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...factoryMeta,
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expression: o.importExpr(Identifiers.inject).callFn([meta.useExisting]),
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});
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} else {
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result = compileFactoryFunction(factoryMeta);
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}
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const token = meta.type;
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const providedIn = meta.providedIn;
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const expression = o.importExpr(Identifiers.defineInjectable).callFn([mapToMapExpression(
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{token, factory: result.factory, providedIn})]);
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const type = new o.ExpressionType(
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o.importExpr(Identifiers.InjectableDef, [new o.ExpressionType(meta.type)]));
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return {
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expression,
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type,
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statements: result.statements,
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};
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}
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