langium

import { startLanguageServer, EmptyFileSystem, LangiumSharedServices } from 'langium'; import { NodeFileSystem } from 'langium/node'; import { createConnection, ProposedFeatures } from 'vscode-languageserver/node'; // --- This part of the code is typically generated by `langium-cli` --- // It sets up your language's grammar, parser, validator, and other services. // For a runnable example, we'll mock a simple `createMyLanguageServices`. interface MyLanguageServices { // Define your language-specific service interfaces here // e.g., validation: { MyLanguageValidator: MyLanguageValidator } } function createMyLanguageServices(context: { connection?: ReturnType<typeof createConnection>; fileSystem: EmptyFileSystem | NodeFileSystem; }): { shared: LangiumSharedServices; MyLanguage: MyLanguageServices } { // In a real Langium project, this would load your grammar and hook up // the generated parser, linker, scope provider, etc. // For this quickstart, we're providing a basic mock. const connection = context.connection ?? createConnection(ProposedFeatures.all); // Mimic the creation of default shared services const shared = require('langium/lib/shared/shared-module').createDefaultSharedModule(context); // Mimic the creation of language-specific services const MyLanguage: MyLanguageServices = {}; // Empty mock for demonstration connection.onInitialize(() => { // In a real setup, capabilities would be dynamically provided by Langium return { capabilities: { textDocumentSync: { openClose: true, change: 1 /* TextDocumentSyncKind.Full */ }, completionProvider: { resolveProvider: true, triggerCharacters: ['.'] }, hoverProvider: true } }; }); connection.onInitialized(() => { connection.console.log('Mock Langium language server initialized for MyLanguage.'); }); return { shared, MyLanguage }; } // ------------------------------------------------------------------ // Establish a connection for the language server. // Langium typically uses Node's IPC to communicate with the VS Code client. const connection = createConnection(ProposedFeatures.all); // Create the shared and language-specific services. // `createMyLanguageServices` would be imported from your generated module file (e.g., `./src/language-server/my-language-module.ts`). // The NodeFileSystem is crucial for server-side file access. const { shared, MyLanguage } = createMyLanguageServices({ connection, ...NodeFileSystem }); // Start the language server. // This function handles the lifecycle of the LSP connection and dispatches requests // to the services configured in `shared`. startLanguageServer(shared); // Listen for incoming LSP messages. connection.listen();