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Implemented option for parsing text with an alternative entry rule
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| /****************************************************************************** | ||
| * Copyright 2024 TypeFox GmbH | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the MIT License, which is available in the project root. | ||
| ******************************************************************************/ | ||
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| import type { LangiumParser } from 'langium'; | ||
| import { describe, expect, test, beforeEach } from 'vitest'; | ||
| import { createServicesForGrammar } from 'langium/grammar'; | ||
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| describe('Partial parsing', () => { | ||
| const content = ` | ||
| grammar Test | ||
| entry Model: (a+=A | b+=B)*; | ||
| A: 'a' name=ID; | ||
| B: 'b' name=ID; | ||
| terminal ID: /[_a-zA-Z][\\w_]*/; | ||
| hidden terminal WS: /\\s+/; | ||
| `; | ||
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| let parser: LangiumParser; | ||
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| beforeEach(async () => { | ||
| parser = await parserFromGrammar(content); | ||
| }); | ||
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| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| function expectCorrectParse(text: string, rule?: string): any { | ||
| const result = parser.parse(text, { rule }); | ||
| expect(result.parserErrors.length).toBe(0); | ||
| return result.value; | ||
| } | ||
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| function expectErrorneousParse(text: string, rule?: string): void { | ||
| const result = parser.parse(text, { rule }); | ||
| expect(result.parserErrors.length).toBeGreaterThan(0); | ||
| } | ||
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| test('Should parse correctly with normal entry rule', () => { | ||
| const result = expectCorrectParse('a Foo b Bar'); | ||
| expect(result.a[0].name).toEqual('Foo'); | ||
| expect(result.b[0].name).toEqual('Bar'); | ||
| }); | ||
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| test('Should parse correctly with alternative entry rule A', () => { | ||
| const result = expectCorrectParse('a Foo', 'A'); | ||
| expect(result.name).toEqual('Foo'); | ||
| expectErrorneousParse('b Bar', 'A'); | ||
| }); | ||
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| test('Should parse correctly with alternative entry rule B', () => { | ||
| const result = expectCorrectParse('b Foo', 'B'); | ||
| expect(result.name).toEqual('Foo'); | ||
| expectErrorneousParse('a Foo', 'B'); | ||
| }); | ||
| }); | ||
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| async function parserFromGrammar(grammar: string): Promise<LangiumParser> { | ||
| return (await createServicesForGrammar({ grammar })).parser.LangiumParser; | ||
| } |