/
implementation-provider.ts
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/
implementation-provider.ts
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/******************************************************************************
* Copyright 2022 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.
******************************************************************************/
import type { ImplementationParams, LocationLink } from 'vscode-languageserver';
import type { GrammarConfig } from '../languages/grammar-config.js';
import type { References } from '../references/references.js';
import type { LangiumServices } from './lsp-services.js';
import type { AstNode } from '../syntax-tree.js';
import type { MaybePromise } from '../utils/promise-utils.js';
import type { LangiumDocument } from '../workspace/documents.js';
import { CancellationToken } from '../utils/cancellation.js';
import { findDeclarationNodeAtOffset } from '../utils/cst-utils.js';
/**
* Language-specific service for handling go to implementation requests.
*/
export interface ImplementationProvider {
/**
* Handles a go to implementation request.
*/
getImplementation(document: LangiumDocument, params: ImplementationParams, cancelToken?: CancellationToken): MaybePromise<LocationLink[] | undefined>;
}
export abstract class AbstractGoToImplementationProvider implements ImplementationProvider {
protected readonly references: References;
protected readonly grammarConfig: GrammarConfig;
constructor(services: LangiumServices) {
this.references = services.references.References;
this.grammarConfig = services.parser.GrammarConfig;
}
getImplementation(document: LangiumDocument<AstNode>, params: ImplementationParams, cancelToken = CancellationToken.None): MaybePromise<LocationLink[] | undefined> {
const rootNode = document.parseResult.value;
if (rootNode.$cstNode) {
const sourceCstNode = findDeclarationNodeAtOffset(rootNode.$cstNode, document.textDocument.offsetAt(params.position), this.grammarConfig.nameRegexp);
if (sourceCstNode) {
const nodeDeclaration = this.references.findDeclaration(sourceCstNode);
if (nodeDeclaration) {
return this.collectGoToImplementationLocationLinks(nodeDeclaration, cancelToken);
}
}
}
return undefined;
}
abstract collectGoToImplementationLocationLinks(element: AstNode, cancelToken: CancellationToken): MaybePromise<LocationLink[] | undefined>;
}