@angular/compiler
Version:
Angular - the compiler library
203 lines • 35 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 * as o from '../output/output_ast';
import { Identifiers as R3 } from '../render3/r3_identifiers';
import { typeWithParameters } from './util';
export var R3FactoryDelegateType;
(function (R3FactoryDelegateType) {
R3FactoryDelegateType[R3FactoryDelegateType["Class"] = 0] = "Class";
R3FactoryDelegateType[R3FactoryDelegateType["Function"] = 1] = "Function";
})(R3FactoryDelegateType || (R3FactoryDelegateType = {}));
export var FactoryTarget;
(function (FactoryTarget) {
FactoryTarget[FactoryTarget["Directive"] = 0] = "Directive";
FactoryTarget[FactoryTarget["Component"] = 1] = "Component";
FactoryTarget[FactoryTarget["Injectable"] = 2] = "Injectable";
FactoryTarget[FactoryTarget["Pipe"] = 3] = "Pipe";
FactoryTarget[FactoryTarget["NgModule"] = 4] = "NgModule";
})(FactoryTarget || (FactoryTarget = {}));
/**
* Construct a factory function expression for the given `R3FactoryMetadata`.
*/
export function compileFactoryFunction(meta) {
const t = o.variable('t');
let baseFactoryVar = null;
// The type to instantiate via constructor invocation. If there is no delegated factory, meaning
// this type is always created by constructor invocation, then this is the type-to-create
// parameter provided by the user (t) if specified, or the current type if not. If there is a
// delegated factory (which is used to create the current type) then this is only the type-to-
// create parameter (t).
const typeForCtor = !isDelegatedFactoryMetadata(meta) ?
new o.BinaryOperatorExpr(o.BinaryOperator.Or, t, meta.internalType) :
t;
let ctorExpr = null;
if (meta.deps !== null) {
// There is a constructor (either explicitly or implicitly defined).
if (meta.deps !== 'invalid') {
ctorExpr = new o.InstantiateExpr(typeForCtor, injectDependencies(meta.deps, meta.target));
}
}
else {
// There is no constructor, use the base class' factory to construct typeForCtor.
baseFactoryVar = o.variable(`ɵ${meta.name}_BaseFactory`);
ctorExpr = baseFactoryVar.callFn([typeForCtor]);
}
const body = [];
let retExpr = null;
function makeConditionalFactory(nonCtorExpr) {
const r = o.variable('r');
body.push(r.set(o.NULL_EXPR).toDeclStmt());
const ctorStmt = ctorExpr !== null ? r.set(ctorExpr).toStmt() :
o.importExpr(R3.invalidFactory).callFn([]).toStmt();
body.push(o.ifStmt(t, [ctorStmt], [r.set(nonCtorExpr).toStmt()]));
return r;
}
if (isDelegatedFactoryMetadata(meta)) {
// This type is created with a delegated factory. If a type parameter is not specified, call
// the factory instead.
const delegateArgs = injectDependencies(meta.delegateDeps, meta.target);
// Either call `new delegate(...)` or `delegate(...)` depending on meta.delegateType.
const factoryExpr = new (meta.delegateType === R3FactoryDelegateType.Class ?
o.InstantiateExpr :
o.InvokeFunctionExpr)(meta.delegate, delegateArgs);
retExpr = makeConditionalFactory(factoryExpr);
}
else if (isExpressionFactoryMetadata(meta)) {
// TODO(alxhub): decide whether to lower the value here or in the caller
retExpr = makeConditionalFactory(meta.expression);
}
else {
retExpr = ctorExpr;
}
if (retExpr === null) {
// The expression cannot be formed so render an `ɵɵinvalidFactory()` call.
body.push(o.importExpr(R3.invalidFactory).callFn([]).toStmt());
}
else if (baseFactoryVar !== null) {
// This factory uses a base factory, so call `ɵɵgetInheritedFactory()` to compute it.
const getInheritedFactoryCall = o.importExpr(R3.getInheritedFactory).callFn([meta.internalType]);
// Memoize the base factoryFn: `baseFactory || (baseFactory = ɵɵgetInheritedFactory(...))`
const baseFactory = new o.BinaryOperatorExpr(o.BinaryOperator.Or, baseFactoryVar, baseFactoryVar.set(getInheritedFactoryCall));
body.push(new o.ReturnStatement(baseFactory.callFn([typeForCtor])));
}
else {
// This is straightforward factory, just return it.
body.push(new o.ReturnStatement(retExpr));
}
let factoryFn = o.fn([new o.FnParam('t', o.DYNAMIC_TYPE)], body, o.INFERRED_TYPE, undefined, `${meta.name}_Factory`);
if (baseFactoryVar !== null) {
// There is a base factory variable so wrap its declaration along with the factory function into
// an IIFE.
factoryFn = o.fn([], [
new o.DeclareVarStmt(baseFactoryVar.name), new o.ReturnStatement(factoryFn)
]).callFn([], /* sourceSpan */ undefined, /* pure */ true);
}
return {
expression: factoryFn,
statements: [],
type: createFactoryType(meta),
};
}
export function createFactoryType(meta) {
const ctorDepsType = meta.deps !== null && meta.deps !== 'invalid' ? createCtorDepsType(meta.deps) : o.NONE_TYPE;
return o.expressionType(o.importExpr(R3.FactoryDeclaration, [typeWithParameters(meta.type.type, meta.typeArgumentCount), ctorDepsType]));
}
function injectDependencies(deps, target) {
return deps.map((dep, index) => compileInjectDependency(dep, target, index));
}
function compileInjectDependency(dep, target, index) {
// Interpret the dependency according to its resolved type.
if (dep.token === null) {
return o.importExpr(R3.invalidFactoryDep).callFn([o.literal(index)]);
}
else if (dep.attributeNameType === null) {
// Build up the injection flags according to the metadata.
const flags = 0 /* Default */ | (dep.self ? 2 /* Self */ : 0) |
(dep.skipSelf ? 4 /* SkipSelf */ : 0) | (dep.host ? 1 /* Host */ : 0) |
(dep.optional ? 8 /* Optional */ : 0) |
(target === FactoryTarget.Pipe ? 16 /* ForPipe */ : 0);
// If this dependency is optional or otherwise has non-default flags, then additional
// parameters describing how to inject the dependency must be passed to the inject function
// that's being used.
let flagsParam = (flags !== 0 /* Default */ || dep.optional) ? o.literal(flags) : null;
// Build up the arguments to the injectFn call.
const injectArgs = [dep.token];
if (flagsParam) {
injectArgs.push(flagsParam);
}
const injectFn = getInjectFn(target);
return o.importExpr(injectFn).callFn(injectArgs);
}
else {
// The `dep.attributeTypeName` value is defined, which indicates that this is an `@Attribute()`
// type dependency. For the generated JS we still want to use the `dep.token` value in case the
// name given for the attribute is not a string literal. For example given `@Attribute(foo())`,
// we want to generate `ɵɵinjectAttribute(foo())`.
//
// The `dep.attributeTypeName` is only actually used (in `createCtorDepType()`) to generate
// typings.
return o.importExpr(R3.injectAttribute).callFn([dep.token]);
}
}
function createCtorDepsType(deps) {
let hasTypes = false;
const attributeTypes = deps.map(dep => {
const type = createCtorDepType(dep);
if (type !== null) {
hasTypes = true;
return type;
}
else {
return o.literal(null);
}
});
if (hasTypes) {
return o.expressionType(o.literalArr(attributeTypes));
}
else {
return o.NONE_TYPE;
}
}
function createCtorDepType(dep) {
const entries = [];
if (dep.attributeNameType !== null) {
entries.push({ key: 'attribute', value: dep.attributeNameType, quoted: false });
}
if (dep.optional) {
entries.push({ key: 'optional', value: o.literal(true), quoted: false });
}
if (dep.host) {
entries.push({ key: 'host', value: o.literal(true), quoted: false });
}
if (dep.self) {
entries.push({ key: 'self', value: o.literal(true), quoted: false });
}
if (dep.skipSelf) {
entries.push({ key: 'skipSelf', value: o.literal(true), quoted: false });
}
return entries.length > 0 ? o.literalMap(entries) : null;
}
export function isDelegatedFactoryMetadata(meta) {
return meta.delegateType !== undefined;
}
export function isExpressionFactoryMetadata(meta) {
return meta.expression !== undefined;
}
function getInjectFn(target) {
switch (target) {
case FactoryTarget.Component:
case FactoryTarget.Directive:
case FactoryTarget.Pipe:
return R3.directiveInject;
case FactoryTarget.NgModule:
case FactoryTarget.Injectable:
default:
return R3.inject;
}
}
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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 {StaticSymbol} from '../aot/static_symbol';\nimport {CompileTypeMetadata, tokenReference} from '../compile_metadata';\nimport {InjectFlags} from '../core';\nimport * as o from '../output/output_ast';\nimport {Identifiers as R3} from '../render3/r3_identifiers';\nimport {OutputContext} from '../util';\n\nimport {R3CompiledExpression, R3Reference, typeWithParameters} from './util';\nimport {unsupported} from './view/util';\n\n\n\n/**\n * Metadata required by the factory generator to generate a `factory` function for a type.\n */\nexport interface R3ConstructorFactoryMetadata {\n  /**\n   * String name of the type being generated (used to name the factory function).\n   */\n  name: string;\n\n  /**\n   * An expression representing the interface type being constructed.\n   */\n  type: R3Reference;\n\n  /**\n   * An expression representing the constructor type, intended for use within a class definition\n   * itself.\n   *\n   * This can differ from the outer `type` if the class is being compiled by ngcc and is inside\n   * an IIFE structure that uses a different name internally.\n   */\n  internalType: o.Expression;\n\n  /** Number of arguments for the `type`. */\n  typeArgumentCount: number;\n\n  /**\n   * Regardless of whether `fnOrClass` is a constructor function or a user-defined factory, it\n   * may have 0 or more parameters, which will be injected according to the `R3DependencyMetadata`\n   * for those parameters. If this is `null`, then the type's constructor is nonexistent and will\n   * be inherited from `fnOrClass` which is interpreted as the current type. If this is `'invalid'`,\n   * then one or more of the parameters wasn't resolvable and any attempt to use these deps will\n   * result in a runtime error.\n   */\n  deps: R3DependencyMetadata[]|'invalid'|null;\n\n  /**\n   * Type of the target being created by the factory.\n   */\n  target: FactoryTarget;\n}\n\nexport enum R3FactoryDelegateType {\n  Class = 0,\n  Function = 1,\n}\n\nexport interface R3DelegatedFnOrClassMetadata extends R3ConstructorFactoryMetadata {\n  delegate: o.Expression;\n  delegateType: R3FactoryDelegateType;\n  delegateDeps: R3DependencyMetadata[];\n}\n\nexport interface R3ExpressionFactoryMetadata extends R3ConstructorFactoryMetadata {\n  expression: o.Expression;\n}\n\nexport type R3FactoryMetadata =\n    R3ConstructorFactoryMetadata|R3DelegatedFnOrClassMetadata|R3ExpressionFactoryMetadata;\n\nexport enum FactoryTarget {\n  Directive = 0,\n  Component = 1,\n  Injectable = 2,\n  Pipe = 3,\n  NgModule = 4,\n}\n\nexport interface R3DependencyMetadata {\n  /**\n   * An expression representing the token or value to be injected.\n   * Or `null` if the dependency could not be resolved - making it invalid.\n   */\n  token: o.Expression|null;\n\n  /**\n   * If an @Attribute decorator is present, this is the literal type of the attribute name, or\n   * the unknown type if no literal type is available (e.g. the attribute name is an expression).\n   * Otherwise it is null;\n   */\n  attributeNameType: o.Expression|null;\n\n  /**\n   * Whether the dependency has an @Host qualifier.\n   */\n  host: boolean;\n\n  /**\n   * Whether the dependency has an @Optional qualifier.\n   */\n  optional: boolean;\n\n  /**\n   * Whether the dependency has an @Self qualifier.\n   */\n  self: boolean;\n\n  /**\n   * Whether the dependency has an @SkipSelf qualifier.\n   */\n  skipSelf: boolean;\n}\n\n/**\n * Construct a factory function expression for the given `R3FactoryMetadata`.\n */\nexport function compileFactoryFunction(meta: R3FactoryMetadata): R3CompiledExpression {\n  const t = o.variable('t');\n  let baseFactoryVar: o.ReadVarExpr|null = null;\n\n  // The type to instantiate via constructor invocation. If there is no delegated factory, meaning\n  // this type is always created by constructor invocation, then this is the type-to-create\n  // parameter provided by the user (t) if specified, or the current type if not. If there is a\n  // delegated factory (which is used to create the current type) then this is only the type-to-\n  // create parameter (t).\n  const typeForCtor = !isDelegatedFactoryMetadata(meta) ?\n      new o.BinaryOperatorExpr(o.BinaryOperator.Or, t, meta.internalType) :\n      t;\n\n  let ctorExpr: o.Expression|null = null;\n  if (meta.deps !== null) {\n    // There is a constructor (either explicitly or implicitly defined).\n    if (meta.deps !== 'invalid') {\n      ctorExpr = new o.InstantiateExpr(typeForCtor, injectDependencies(meta.deps, meta.target));\n    }\n  } else {\n    // There is no constructor, use the base class' factory to construct typeForCtor.\n    baseFactoryVar = o.variable(`ɵ${meta.name}_BaseFactory`);\n    ctorExpr = baseFactoryVar.callFn([typeForCtor]);\n  }\n\n  const body: o.Statement[] = [];\n  let retExpr: o.Expression|null = null;\n\n  function makeConditionalFactory(nonCtorExpr: o.Expression): o.ReadVarExpr {\n    const r = o.variable('r');\n    body.push(r.set(o.NULL_EXPR).toDeclStmt());\n    const ctorStmt = ctorExpr !== null ? r.set(ctorExpr).toStmt() :\n                                         o.importExpr(R3.invalidFactory).callFn([]).toStmt();\n    body.push(o.ifStmt(t, [ctorStmt], [r.set(nonCtorExpr).toStmt()]));\n    return r;\n  }\n\n  if (isDelegatedFactoryMetadata(meta)) {\n    // This type is created with a delegated factory. If a type parameter is not specified, call\n    // the factory instead.\n    const delegateArgs = injectDependencies(meta.delegateDeps, meta.target);\n    // Either call `new delegate(...)` or `delegate(...)` depending on meta.delegateType.\n    const factoryExpr = new (\n        meta.delegateType === R3FactoryDelegateType.Class ?\n            o.InstantiateExpr :\n            o.InvokeFunctionExpr)(meta.delegate, delegateArgs);\n    retExpr = makeConditionalFactory(factoryExpr);\n  } else if (isExpressionFactoryMetadata(meta)) {\n    // TODO(alxhub): decide whether to lower the value here or in the caller\n    retExpr = makeConditionalFactory(meta.expression);\n  } else {\n    retExpr = ctorExpr;\n  }\n\n\n  if (retExpr === null) {\n    // The expression cannot be formed so render an `ɵɵinvalidFactory()` call.\n    body.push(o.importExpr(R3.invalidFactory).callFn([]).toStmt());\n  } else if (baseFactoryVar !== null) {\n    // This factory uses a base factory, so call `ɵɵgetInheritedFactory()` to compute it.\n    const getInheritedFactoryCall =\n        o.importExpr(R3.getInheritedFactory).callFn([meta.internalType]);\n    // Memoize the base factoryFn: `baseFactory || (baseFactory = ɵɵgetInheritedFactory(...))`\n    const baseFactory = new o.BinaryOperatorExpr(\n        o.BinaryOperator.Or, baseFactoryVar, baseFactoryVar.set(getInheritedFactoryCall));\n    body.push(new o.ReturnStatement(baseFactory.callFn([typeForCtor])));\n  } else {\n    // This is straightforward factory, just return it.\n    body.push(new o.ReturnStatement(retExpr));\n  }\n\n  let factoryFn: o.Expression = o.fn(\n      [new o.FnParam('t', o.DYNAMIC_TYPE)], body, o.INFERRED_TYPE, undefined,\n      `${meta.name}_Factory`);\n\n  if (baseFactoryVar !== null) {\n    // There is a base factory variable so wrap its declaration along with the factory function into\n    // an IIFE.\n    factoryFn = o.fn([], [\n                   new o.DeclareVarStmt(baseFactoryVar.name!), new o.ReturnStatement(factoryFn)\n                 ]).callFn([], /* sourceSpan */ undefined, /* pure */ true);\n  }\n\n  return {\n    expression: factoryFn,\n    statements: [],\n    type: createFactoryType(meta),\n  };\n}\n\nexport function createFactoryType(meta: R3FactoryMetadata) {\n  const ctorDepsType =\n      meta.deps !== null && meta.deps !== 'invalid' ? createCtorDepsType(meta.deps) : o.NONE_TYPE;\n  return o.expressionType(o.importExpr(\n      R3.FactoryDeclaration,\n      [typeWithParameters(meta.type.type, meta.typeArgumentCount), ctorDepsType]));\n}\n\nfunction injectDependencies(deps: R3DependencyMetadata[], target: FactoryTarget): o.Expression[] {\n  return deps.map((dep, index) => compileInjectDependency(dep, target, index));\n}\n\nfunction compileInjectDependency(\n    dep: R3DependencyMetadata, target: FactoryTarget, index: number): o.Expression {\n  // Interpret the dependency according to its resolved type.\n  if (dep.token === null) {\n    return o.importExpr(R3.invalidFactoryDep).callFn([o.literal(index)]);\n  } else if (dep.attributeNameType === null) {\n    // Build up the injection flags according to the metadata.\n    const flags = InjectFlags.Default | (dep.self ? InjectFlags.Self : 0) |\n        (dep.skipSelf ? InjectFlags.SkipSelf : 0) | (dep.host ? InjectFlags.Host : 0) |\n        (dep.optional ? InjectFlags.Optional : 0) |\n        (target === FactoryTarget.Pipe ? InjectFlags.ForPipe : 0);\n\n    // If this dependency is optional or otherwise has non-default flags, then additional\n    // parameters describing how to inject the dependency must be passed to the inject function\n    // that's being used.\n    let flagsParam: o.LiteralExpr|null =\n        (flags !== InjectFlags.Default || dep.optional) ? o.literal(flags) : null;\n\n    // Build up the arguments to the injectFn call.\n    const injectArgs = [dep.token];\n    if (flagsParam) {\n      injectArgs.push(flagsParam);\n    }\n    const injectFn = getInjectFn(target);\n    return o.importExpr(injectFn).callFn(injectArgs);\n  } else {\n    // The `dep.attributeTypeName` value is defined, which indicates that this is an `@Attribute()`\n    // type dependency. For the generated JS we still want to use the `dep.token` value in case the\n    // name given for the attribute is not a string literal. For example given `@Attribute(foo())`,\n    // we want to generate `ɵɵinjectAttribute(foo())`.\n    //\n    // The `dep.attributeTypeName` is only actually used (in `createCtorDepType()`) to generate\n    // typings.\n    return o.importExpr(R3.injectAttribute).callFn([dep.token]);\n  }\n}\n\nfunction createCtorDepsType(deps: R3DependencyMetadata[]): o.Type {\n  let hasTypes = false;\n  const attributeTypes = deps.map(dep => {\n    const type = createCtorDepType(dep);\n    if (type !== null) {\n      hasTypes = true;\n      return type;\n    } else {\n      return o.literal(null);\n    }\n  });\n\n  if (hasTypes) {\n    return o.expressionType(o.literalArr(attributeTypes));\n  } else {\n    return o.NONE_TYPE;\n  }\n}\n\nfunction createCtorDepType(dep: R3DependencyMetadata): o.LiteralMapExpr|null {\n  const entries: {key: string, quoted: boolean, value: o.Expression}[] = [];\n\n  if (dep.attributeNameType !== null) {\n    entries.push({key: 'attribute', value: dep.attributeNameType, quoted: false});\n  }\n  if (dep.optional) {\n    entries.push({key: 'optional', value: o.literal(true), quoted: false});\n  }\n  if (dep.host) {\n    entries.push({key: 'host', value: o.literal(true), quoted: false});\n  }\n  if (dep.self) {\n    entries.push({key: 'self', value: o.literal(true), quoted: false});\n  }\n  if (dep.skipSelf) {\n    entries.push({key: 'skipSelf', value: o.literal(true), quoted: false});\n  }\n\n  return entries.length > 0 ? o.literalMap(entries) : null;\n}\n\nexport function isDelegatedFactoryMetadata(meta: R3FactoryMetadata):\n    meta is R3DelegatedFnOrClassMetadata {\n  return (meta as any).delegateType !== undefined;\n}\n\nexport function isExpressionFactoryMetadata(meta: R3FactoryMetadata):\n    meta is R3ExpressionFactoryMetadata {\n  return (meta as any).expression !== undefined;\n}\n\nfunction getInjectFn(target: FactoryTarget): o.ExternalReference {\n  switch (target) {\n    case FactoryTarget.Component:\n    case FactoryTarget.Directive:\n    case FactoryTarget.Pipe:\n      return R3.directiveInject;\n    case FactoryTarget.NgModule:\n    case FactoryTarget.Injectable:\n    default:\n      return R3.inject;\n  }\n}\n"]}