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main
packages/compiler/test/expression_parser/ast_spec.ts
46 строк
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Kristiyan Kostadinov
refactor(compiler): consolidate error classes (#62160)
23 июн 2025, 15:25
23 июн 2025, 15:25
5e9707d
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/** * @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.dev/license */ import {AST, Lexer, Parser, RecursiveAstVisitor} from '../../index'; import {Call, ImplicitReceiver, PropertyRead} from '../../src/compiler'; import {getFakeSpan} from './utils/span'; describe('RecursiveAstVisitor', () => { it('should visit every node', () => { const parser = new Parser(new Lexer()); const ast = parser.parseBinding('x.y()', getFakeSpan(), 0 /* absoluteOffset */); const visitor = new Visitor(); const path: AST[] = []; visitor.visit(ast.ast, path); // If the visitor method of RecursiveAstVisitor is implemented correctly, // then we should have collected the full path from root to leaf. expect(path.length).toBe(4); const [call, yRead, xRead, implicitReceiver] = path; expectType(call, Call); expectType(yRead, PropertyRead); expectType(xRead, PropertyRead); expectType(implicitReceiver, ImplicitReceiver); expect(xRead.name).toBe('x'); expect(yRead.name).toBe('y'); expect(call.args).toEqual([]); }); }); class Visitor extends RecursiveAstVisitor { override visit(node: AST, path: AST[]) { path.push(node); node.visit(this, path); } } type Newable = new (...args: any) => any; function expectType<T extends Newable>(val: any, t: T): asserts val is InstanceType<T> { expect(val instanceof t) .withContext(`expect ${val.constructor.name} to be ${t.name}`) .toBe(true); }