/
utils.ts
84 lines (74 loc) 路 2.89 KB
/
utils.ts
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/**
* @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 * as ts from 'typescript';
import {Reference} from '../../../src/ngtsc/imports';
import {ClassDeclaration, Decorator, isNamedClassDeclaration, isNamedFunctionDeclaration, isNamedVariableDeclaration} from '../../../src/ngtsc/reflection';
import {MigrationHost} from './migration';
export function isClassDeclaration(clazz: ts.Declaration): clazz is ClassDeclaration {
return isNamedClassDeclaration(clazz) || isNamedFunctionDeclaration(clazz) ||
isNamedVariableDeclaration(clazz);
}
/**
* Returns true if the `clazz` is decorated as a `Directive` or `Component`.
*/
export function hasDirectiveDecorator(host: MigrationHost, clazz: ClassDeclaration): boolean {
return host.metadata.getDirectiveMetadata(new Reference(clazz)) !== null;
}
/**
* Returns true if the `clazz` has its own constructor function.
*/
export function hasConstructor(host: MigrationHost, clazz: ClassDeclaration): boolean {
return host.reflectionHost.getConstructorParameters(clazz) !== null;
}
/**
* Create an empty `Directive` decorator that will be associated with the `clazz`.
*/
export function createDirectiveDecorator(clazz: ClassDeclaration): Decorator {
const selectorArg = ts.createObjectLiteral([
// TODO: At the moment ngtsc does not accept a directive with no selector
ts.createPropertyAssignment('selector', ts.createStringLiteral('NGCC_DUMMY')),
]);
const decoratorType = ts.createIdentifier('Directive');
const decoratorNode = ts.createObjectLiteral([
ts.createPropertyAssignment('type', decoratorType),
ts.createPropertyAssignment('args', ts.createArrayLiteral([selectorArg])),
]);
setParentPointers(clazz.getSourceFile(), decoratorNode);
return {
name: 'Directive',
identifier: decoratorType,
import: {name: 'Directive', from: '@angular/core'},
node: decoratorNode,
args: [selectorArg],
};
}
/**
* Create an empty `Injectable` decorator that will be associated with the `clazz`.
*/
export function createInjectableDecorator(clazz: ClassDeclaration): Decorator {
const decoratorType = ts.createIdentifier('Injectable');
const decoratorNode = ts.createObjectLiteral([
ts.createPropertyAssignment('type', decoratorType),
ts.createPropertyAssignment('args', ts.createArrayLiteral([])),
]);
setParentPointers(clazz.getSourceFile(), decoratorNode);
return {
name: 'Injectable',
identifier: decoratorType,
import: {name: 'Injectable', from: '@angular/core'},
node: decoratorNode,
args: [],
};
}
/**
* Ensure that a tree of AST nodes have their parents wired up.
*/
export function setParentPointers(parent: ts.Node, child: ts.Node): void {
child.parent = parent;
ts.forEachChild(child, grandchild => setParentPointers(child, grandchild));
}