@angular/compiler
Version:
Angular - the compiler library
89 lines • 13.7 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
*/
import { Identifiers } from './identifiers';
import * as o from './output/output_ast';
import { compileFactoryFunction } from './render3/r3_factory';
import { mapToMapExpression } from './render3/util';
export function compileInjectable(meta) {
let factory = o.NULL_EXPR;
function makeFn(ret) {
return o.fn([], [new o.ReturnStatement(ret)], undefined, undefined, `${meta.name}_Factory`);
}
if (meta.useClass !== undefined || meta.useFactory !== undefined) {
// First, handle useClass and useFactory together, since both involve a similar call to
// `compileFactoryFunction`. Either dependencies are explicitly specified, in which case
// a factory function call is generated, or they're not specified and the calls are special-
// cased.
if (meta.deps !== undefined) {
// Either call `new meta.useClass(...)` or `meta.useFactory(...)`.
const fnOrClass = meta.useClass || meta.useFactory;
// useNew: true if meta.useClass, false for meta.useFactory.
const useNew = meta.useClass !== undefined;
factory = compileFactoryFunction({
name: meta.name,
fnOrClass,
useNew,
injectFn: Identifiers.inject,
deps: meta.deps,
});
}
else if (meta.useClass !== undefined) {
// Special case for useClass where the factory from the class's ngInjectableDef is used.
if (meta.useClass.isEquivalent(meta.type)) {
// For the injectable compiler, useClass represents a foreign type that should be
// instantiated to satisfy construction of the given type. It's not valid to specify
// useClass === type, since the useClass type is expected to already be compiled.
throw new Error(`useClass is the same as the type, but no deps specified, which is invalid.`);
}
factory =
makeFn(new o.ReadPropExpr(new o.ReadPropExpr(meta.useClass, 'ngInjectableDef'), 'factory')
.callFn([]));
}
else if (meta.useFactory !== undefined) {
// Special case for useFactory where no arguments are passed.
factory = meta.useFactory.callFn([]);
}
else {
// Can't happen - outer conditional guards against both useClass and useFactory being
// undefined.
throw new Error('Reached unreachable block in injectable compiler.');
}
}
else if (meta.useValue !== undefined) {
// Note: it's safe to use `meta.useValue` instead of the `USE_VALUE in meta` check used for
// client code because meta.useValue is an Expression which will be defined even if the actual
// value is undefined.
factory = makeFn(meta.useValue);
}
else if (meta.useExisting !== undefined) {
// useExisting is an `inject` call on the existing token.
factory = makeFn(o.importExpr(Identifiers.inject).callFn([meta.useExisting]));
}
else {
// A strict type is compiled according to useClass semantics, except the dependencies are
// required.
if (meta.deps === undefined) {
throw new Error(`Type compilation of an injectable requires dependencies.`);
}
factory = compileFactoryFunction({
name: meta.name,
fnOrClass: meta.type,
useNew: true,
injectFn: Identifiers.inject,
deps: meta.deps,
});
}
const token = meta.type;
const providedIn = meta.providedIn;
const expression = o.importExpr(Identifiers.defineInjectable).callFn([mapToMapExpression({ token, factory, providedIn })]);
const type = new o.ExpressionType(o.importExpr(Identifiers.InjectableDef, [new o.ExpressionType(meta.type)]));
return {
expression, type,
};
}
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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 {InjectFlags} from './core';\nimport {Identifiers} from './identifiers';\nimport * as o from './output/output_ast';\nimport {R3DependencyMetadata, compileFactoryFunction} from './render3/r3_factory';\nimport {mapToMapExpression} from './render3/util';\n\nexport interface InjectableDef {\n  expression: o.Expression;\n  type: o.Type;\n}\n\nexport interface R3InjectableMetadata {\n  name: string;\n  type: o.Expression;\n  providedIn: o.Expression;\n  useClass?: o.Expression;\n  useFactory?: o.Expression;\n  useExisting?: o.Expression;\n  useValue?: o.Expression;\n  deps?: R3DependencyMetadata[];\n}\n\nexport function compileInjectable(meta: R3InjectableMetadata): InjectableDef {\n  let factory: o.Expression = o.NULL_EXPR;\n\n  function makeFn(ret: o.Expression): o.Expression {\n    return o.fn([], [new o.ReturnStatement(ret)], undefined, undefined, `${meta.name}_Factory`);\n  }\n\n  if (meta.useClass !== undefined || meta.useFactory !== undefined) {\n    // First, handle useClass and useFactory together, since both involve a similar call to\n    // `compileFactoryFunction`. Either dependencies are explicitly specified, in which case\n    // a factory function call is generated, or they're not specified and the calls are special-\n    // cased.\n    if (meta.deps !== undefined) {\n      // Either call `new meta.useClass(...)` or `meta.useFactory(...)`.\n      const fnOrClass: o.Expression = meta.useClass || meta.useFactory !;\n\n      // useNew: true if meta.useClass, false for meta.useFactory.\n      const useNew = meta.useClass !== undefined;\n\n      factory = compileFactoryFunction({\n        name: meta.name,\n        fnOrClass,\n        useNew,\n        injectFn: Identifiers.inject,\n        deps: meta.deps,\n      });\n    } else if (meta.useClass !== undefined) {\n      // Special case for useClass where the factory from the class's ngInjectableDef is used.\n      if (meta.useClass.isEquivalent(meta.type)) {\n        // For the injectable compiler, useClass represents a foreign type that should be\n        // instantiated to satisfy construction of the given type. It's not valid to specify\n        // useClass === type, since the useClass type is expected to already be compiled.\n        throw new Error(\n            `useClass is the same as the type, but no deps specified, which is invalid.`);\n      }\n      factory =\n          makeFn(new o.ReadPropExpr(new o.ReadPropExpr(meta.useClass, 'ngInjectableDef'), 'factory')\n                     .callFn([]));\n    } else if (meta.useFactory !== undefined) {\n      // Special case for useFactory where no arguments are passed.\n      factory = meta.useFactory.callFn([]);\n    } else {\n      // Can't happen - outer conditional guards against both useClass and useFactory being\n      // undefined.\n      throw new Error('Reached unreachable block in injectable compiler.');\n    }\n  } else if (meta.useValue !== undefined) {\n    // Note: it's safe to use `meta.useValue` instead of the `USE_VALUE in meta` check used for\n    // client code because meta.useValue is an Expression which will be defined even if the actual\n    // value is undefined.\n    factory = makeFn(meta.useValue);\n  } else if (meta.useExisting !== undefined) {\n    // useExisting is an `inject` call on the existing token.\n    factory = makeFn(o.importExpr(Identifiers.inject).callFn([meta.useExisting]));\n  } else {\n    // A strict type is compiled according to useClass semantics, except the dependencies are\n    // required.\n    if (meta.deps === undefined) {\n      throw new Error(`Type compilation of an injectable requires dependencies.`);\n    }\n    factory = compileFactoryFunction({\n      name: meta.name,\n      fnOrClass: meta.type,\n      useNew: true,\n      injectFn: Identifiers.inject,\n      deps: meta.deps,\n    });\n  }\n\n  const token = meta.type;\n  const providedIn = meta.providedIn;\n\n  const expression = o.importExpr(Identifiers.defineInjectable).callFn([mapToMapExpression(\n      {token, factory, providedIn})]);\n  const type = new o.ExpressionType(\n      o.importExpr(Identifiers.InjectableDef, [new o.ExpressionType(meta.type)]));\n\n  return {\n      expression, type,\n  };\n}\n"]}