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5e9707dc84
Currently we have a `ParserError` that is used for the expression parser and a `ParseError` that is used everywhere else. These changes consolidate them into the `ParseError` to avoid confusion and make it easier to add more context in the future. PR Close #62160
46 lines
1.6 KiB
TypeScript
46 lines
1.6 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {AST, Lexer, Parser, RecursiveAstVisitor} from '../../index';
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import {Call, ImplicitReceiver, PropertyRead} from '../../src/compiler';
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import {getFakeSpan} from './utils/span';
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describe('RecursiveAstVisitor', () => {
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it('should visit every node', () => {
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const parser = new Parser(new Lexer());
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const ast = parser.parseBinding('x.y()', getFakeSpan(), 0 /* absoluteOffset */);
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const visitor = new Visitor();
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const path: AST[] = [];
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visitor.visit(ast.ast, path);
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// If the visitor method of RecursiveAstVisitor is implemented correctly,
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// then we should have collected the full path from root to leaf.
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expect(path.length).toBe(4);
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const [call, yRead, xRead, implicitReceiver] = path;
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expectType(call, Call);
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expectType(yRead, PropertyRead);
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expectType(xRead, PropertyRead);
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expectType(implicitReceiver, ImplicitReceiver);
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expect(xRead.name).toBe('x');
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expect(yRead.name).toBe('y');
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expect(call.args).toEqual([]);
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});
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});
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class Visitor extends RecursiveAstVisitor {
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override visit(node: AST, path: AST[]) {
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path.push(node);
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node.visit(this, path);
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}
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}
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type Newable = new (...args: any) => any;
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function expectType<T extends Newable>(val: any, t: T): asserts val is InstanceType<T> {
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expect(val instanceof t)
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.withContext(`expect ${val.constructor.name} to be ${t.name}`)
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.toBe(true);
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}
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