@angular/compiler
Version:
Angular - the compiler library
95 lines • 15.8 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 { Identifiers } from './identifiers';
import * as o from './output/output_ast';
import { compileFactoryFunction, R3FactoryDelegateType, R3FactoryTarget } from './render3/r3_factory';
import { mapToMapExpression, typeWithParameters } from './render3/util';
export function compileInjectable(meta) {
let result = null;
const factoryMeta = {
name: meta.name,
type: meta.type,
internalType: meta.internalType,
typeArgumentCount: meta.typeArgumentCount,
deps: [],
injectFn: Identifiers.inject,
target: R3FactoryTarget.Injectable,
};
if (meta.useClass !== undefined) {
// meta.useClass has two modes of operation. Either deps are specified, in which case `new` is
// used to instantiate the class with dependencies injected, or deps are not specified and
// the factory of the class is used to instantiate it.
//
// A special case exists for useClass: Type where Type is the injectable type itself and no
// deps are specified, in which case 'useClass' is effectively ignored.
const useClassOnSelf = meta.useClass.isEquivalent(meta.internalType);
let deps = undefined;
if (meta.userDeps !== undefined) {
deps = meta.userDeps;
}
if (deps !== undefined) {
// factory: () => new meta.useClass(...deps)
result = compileFactoryFunction(Object.assign(Object.assign({}, factoryMeta), { delegate: meta.useClass, delegateDeps: deps, delegateType: R3FactoryDelegateType.Class }));
}
else if (useClassOnSelf) {
result = compileFactoryFunction(factoryMeta);
}
else {
result = delegateToFactory(meta.type.value, meta.useClass);
}
}
else if (meta.useFactory !== undefined) {
if (meta.userDeps !== undefined) {
result = compileFactoryFunction(Object.assign(Object.assign({}, factoryMeta), { delegate: meta.useFactory, delegateDeps: meta.userDeps || [], delegateType: R3FactoryDelegateType.Function }));
}
else {
result = {
statements: [],
factory: o.fn([], [new o.ReturnStatement(meta.useFactory.callFn([]))])
};
}
}
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.
result = compileFactoryFunction(Object.assign(Object.assign({}, factoryMeta), { expression: meta.useValue }));
}
else if (meta.useExisting !== undefined) {
// useExisting is an `inject` call on the existing token.
result = compileFactoryFunction(Object.assign(Object.assign({}, factoryMeta), { expression: o.importExpr(Identifiers.inject).callFn([meta.useExisting]) }));
}
else {
result = delegateToFactory(meta.type.value, meta.internalType);
}
const token = meta.internalType;
const injectableProps = { token, factory: result.factory };
// Only generate providedIn property if it has a non-null value
if (meta.providedIn.value !== null) {
injectableProps.providedIn = meta.providedIn;
}
const expression = o.importExpr(Identifiers.ɵɵdefineInjectable).callFn([mapToMapExpression(injectableProps)]);
const type = new o.ExpressionType(o.importExpr(Identifiers.InjectableDef, [typeWithParameters(meta.type.type, meta.typeArgumentCount)]));
return {
expression,
type,
statements: result.statements,
};
}
function delegateToFactory(type, internalType) {
return {
statements: [],
// If types are the same, we can generate `factory: type.ɵfac`
// If types are different, we have to generate a wrapper function to ensure
// the internal type has been resolved (`factory: function(t) { return type.ɵfac(t); }`)
factory: type.node === internalType.node ?
internalType.prop('ɵfac') :
o.fn([new o.FnParam('t', o.DYNAMIC_TYPE)], [new o.ReturnStatement(internalType.callMethod('ɵfac', [o.variable('t')]))])
};
}
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Either deps are specified, in which case `new` is\n    // used to instantiate the class with dependencies injected, or deps are not specified and\n    // the factory of the class is used to instantiate it.\n    //\n    // A special case exists for useClass: Type where Type is the injectable type itself and no\n    // deps are specified, in which case 'useClass' is effectively ignored.\n\n    const useClassOnSelf = meta.useClass.isEquivalent(meta.internalType);\n    let deps: R3DependencyMetadata[]|undefined = undefined;\n    if (meta.userDeps !== undefined) {\n      deps = meta.userDeps;\n    }\n\n    if (deps !== undefined) {\n      // factory: () => new meta.useClass(...deps)\n      result = compileFactoryFunction({\n        ...factoryMeta,\n        delegate: meta.useClass,\n        delegateDeps: deps,\n        delegateType: R3FactoryDelegateType.Class,\n      });\n    } else if (useClassOnSelf) {\n      result = compileFactoryFunction(factoryMeta);\n    } else {\n      result = delegateToFactory(\n          meta.type.value as o.WrappedNodeExpr<any>, meta.useClass as o.WrappedNodeExpr<any>);\n    }\n  } else if (meta.useFactory !== undefined) {\n    if (meta.userDeps !== undefined) {\n      result = compileFactoryFunction({\n        ...factoryMeta,\n        delegate: meta.useFactory,\n        delegateDeps: meta.userDeps || [],\n        delegateType: R3FactoryDelegateType.Function,\n      });\n    } else {\n      result = {\n        statements: [],\n        factory: o.fn([], [new o.ReturnStatement(meta.useFactory.callFn([]))])\n      };\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    result = compileFactoryFunction({\n      ...factoryMeta,\n      expression: meta.useValue,\n    });\n  } else if (meta.useExisting !== undefined) {\n    // useExisting is an `inject` call on the existing token.\n    result = compileFactoryFunction({\n      ...factoryMeta,\n      expression: o.importExpr(Identifiers.inject).callFn([meta.useExisting]),\n    });\n  } else {\n    result = delegateToFactory(\n        meta.type.value as o.WrappedNodeExpr<any>, meta.internalType as o.WrappedNodeExpr<any>);\n  }\n\n  const token = meta.internalType;\n\n  const injectableProps: {[key: string]: o.Expression} = {token, factory: result.factory};\n\n  // Only generate providedIn property if it has a non-null value\n  if ((meta.providedIn as o.LiteralExpr).value !== null) {\n    injectableProps.providedIn = meta.providedIn;\n  }\n\n  const expression =\n      o.importExpr(Identifiers.ɵɵdefineInjectable).callFn([mapToMapExpression(injectableProps)]);\n  const type = new o.ExpressionType(o.importExpr(\n      Identifiers.InjectableDef, [typeWithParameters(meta.type.type, meta.typeArgumentCount)]));\n\n  return {\n    expression,\n    type,\n    statements: result.statements,\n  };\n}\n\nfunction delegateToFactory(type: o.WrappedNodeExpr<any>, internalType: o.WrappedNodeExpr<any>) {\n  return {\n    statements: [],\n    // If types are the same, we can generate `factory: type.ɵfac`\n    // If types are different, we have to generate a wrapper function to ensure\n    // the internal type has been resolved (`factory: function(t) { return type.ɵfac(t); }`)\n    factory: type.node === internalType.node ?\n        internalType.prop('ɵfac') :\n        o.fn([new o.FnParam('t', o.DYNAMIC_TYPE)], [new o.ReturnStatement(internalType.callMethod(\n                                                       'ɵfac', [o.variable('t')]))])\n  };\n}\n"]}