feat: connect NWScript language server to Monaco via WebSocket
Add the forked nwscript-ee-language-server as a git submodule and wire it up to the editor through a WebSocket-based LSP bridge: - Backend: lsp.service.ts spawns the language server in --stdio mode and bridges JSON-RPC messages between WebSocket and stdin/stdout - Backend: /ws/lsp upgrade handler in index.ts - Frontend: LspClient class using vscode-ws-jsonrpc for JSON-RPC over WebSocket, with Monaco providers for completions, hover, and diagnostics - Frontend: useLspClient/useLspDocument hooks integrated into MonacoEditor component
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plenarius
@@ -0,0 +1,359 @@
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import { toSocket } from "vscode-ws-jsonrpc";
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import { createWebSocketConnection } from "vscode-ws-jsonrpc";
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import type * as lsp from "vscode-languageserver-protocol";
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import type { editor, languages, IDisposable, Uri, MarkerSeverity } from "monaco-editor";
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const LSP_TRACE = false;
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function trace(...args: unknown[]) {
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if (LSP_TRACE) console.debug("[LSP]", ...args);
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}
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export type LspStatus = "disconnected" | "connecting" | "initializing" | "ready" | "error";
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export class LspClient {
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private ws: WebSocket | null = null;
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private connection: ReturnType<typeof createWebSocketConnection> | null = null;
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private disposables: IDisposable[] = [];
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private documentVersions = new Map<string, number>();
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private statusListeners = new Set<(status: LspStatus) => void>();
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private _status: LspStatus = "disconnected";
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private monacoInstance: typeof import("monaco-editor") | null = null;
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get status() {
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return this._status;
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}
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private setStatus(s: LspStatus) {
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this._status = s;
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for (const cb of this.statusListeners) cb(s);
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}
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onStatusChange(cb: (status: LspStatus) => void): () => void {
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this.statusListeners.add(cb);
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return () => this.statusListeners.delete(cb);
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}
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async connect(monaco: typeof import("monaco-editor")): Promise<void> {
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this.monacoInstance = monaco;
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this.setStatus("connecting");
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const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
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const url = `${protocol}//${window.location.host}/ws/lsp`;
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return new Promise<void>((resolve, reject) => {
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const ws = new WebSocket(url);
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this.ws = ws;
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ws.onopen = async () => {
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try {
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const socket = toSocket(ws);
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this.connection = createWebSocketConnection(socket, {
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error: (msg) => console.error("[LSP]", msg),
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warn: (msg) => console.warn("[LSP]", msg),
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info: (msg) => trace(msg),
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log: (msg) => trace(msg),
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});
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this.setupNotificationHandlers(monaco);
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this.connection.listen();
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this.setStatus("initializing");
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await this.initialize();
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this.registerProviders(monaco);
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this.setStatus("ready");
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resolve();
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} catch (err) {
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this.setStatus("error");
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reject(err);
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}
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};
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ws.onerror = () => {
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this.setStatus("error");
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reject(new Error("WebSocket connection failed"));
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};
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ws.onclose = () => {
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this.setStatus("disconnected");
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};
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});
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}
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private async initialize(): Promise<void> {
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if (!this.connection) throw new Error("No connection");
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const initParams: lsp.InitializeParams = {
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processId: null,
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capabilities: {
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textDocument: {
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completion: {
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completionItem: {
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snippetSupport: false,
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documentationFormat: ["plaintext", "markdown"],
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},
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},
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hover: {
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contentFormat: ["plaintext", "markdown"],
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},
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synchronization: {
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didSave: true,
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},
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publishDiagnostics: {
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relatedInformation: true,
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},
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},
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},
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rootUri: "file:///workspace",
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workspaceFolders: null,
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};
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trace("→ initialize", initParams);
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const result = await this.connection.sendRequest("initialize", initParams);
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trace("← initialize", result);
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this.connection.sendNotification("initialized", {});
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trace("→ initialized");
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}
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private setupNotificationHandlers(monaco: typeof import("monaco-editor")): void {
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if (!this.connection) return;
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this.connection.onNotification(
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"textDocument/publishDiagnostics",
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(params: lsp.PublishDiagnosticsParams) => {
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trace("← publishDiagnostics", params);
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const uri = monaco.Uri.parse(params.uri);
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const model = monaco.editor.getModel(uri);
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if (!model) return;
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const markers: editor.IMarkerData[] = params.diagnostics.map((d) => ({
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severity: this.mapSeverity(monaco, d.severity),
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startLineNumber: d.range.start.line + 1,
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startColumn: d.range.start.character + 1,
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endLineNumber: d.range.end.line + 1,
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endColumn: d.range.end.character + 1,
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message: d.message,
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source: d.source,
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}));
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monaco.editor.setModelMarkers(model, "nwscript-lsp", markers);
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},
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);
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}
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private mapSeverity(
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monaco: typeof import("monaco-editor"),
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severity: lsp.DiagnosticSeverity | undefined,
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): MarkerSeverity {
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switch (severity) {
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case 1:
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return monaco.MarkerSeverity.Error;
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case 2:
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return monaco.MarkerSeverity.Warning;
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case 3:
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return monaco.MarkerSeverity.Info;
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case 4:
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return monaco.MarkerSeverity.Hint;
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default:
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return monaco.MarkerSeverity.Info;
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}
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}
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private registerProviders(monaco: typeof import("monaco-editor")): void {
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this.disposables.push(
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monaco.languages.registerCompletionItemProvider("nwscript", {
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triggerCharacters: ["."],
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provideCompletionItems: async (model, position) => {
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if (!this.connection) return { suggestions: [] };
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const params: lsp.CompletionParams = {
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textDocument: { uri: model.uri.toString() },
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position: {
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line: position.lineNumber - 1,
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character: position.column - 1,
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},
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};
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trace("→ completion", params);
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const result: lsp.CompletionItem[] | lsp.CompletionList | null =
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await this.connection.sendRequest("textDocument/completion", params);
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trace("← completion", result);
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if (!result) return { suggestions: [] };
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const items = Array.isArray(result) ? result : result.items;
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const suggestions: languages.CompletionItem[] = items.map((item) => ({
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label: item.label,
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kind: this.mapCompletionKind(monaco, item.kind),
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insertText: item.insertText ?? item.label,
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detail: item.detail,
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documentation: item.documentation
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? typeof item.documentation === "string"
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? item.documentation
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: { value: item.documentation.value }
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: undefined,
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range: {
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startLineNumber: position.lineNumber,
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startColumn: position.column,
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endLineNumber: position.lineNumber,
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endColumn: position.column,
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},
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}));
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return { suggestions };
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},
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}),
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);
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this.disposables.push(
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monaco.languages.registerHoverProvider("nwscript", {
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provideHover: async (model, position) => {
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if (!this.connection) return null;
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const params: lsp.HoverParams = {
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textDocument: { uri: model.uri.toString() },
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position: {
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line: position.lineNumber - 1,
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character: position.column - 1,
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},
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};
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trace("→ hover", params);
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const result: lsp.Hover | null = await this.connection.sendRequest(
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"textDocument/hover",
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params,
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);
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trace("← hover", result);
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if (!result?.contents) return null;
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const contents = Array.isArray(result.contents)
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? result.contents.map((c) =>
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typeof c === "string" ? { value: c } : { value: c.value },
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)
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: typeof result.contents === "string"
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? [{ value: result.contents }]
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: "value" in result.contents
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? [{ value: result.contents.value }]
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: [{ value: String(result.contents) }];
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return {
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contents,
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range: result.range
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? {
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startLineNumber: result.range.start.line + 1,
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startColumn: result.range.start.character + 1,
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endLineNumber: result.range.end.line + 1,
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endColumn: result.range.end.character + 1,
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}
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: undefined,
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};
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},
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}),
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);
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}
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private mapCompletionKind(
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monaco: typeof import("monaco-editor"),
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kind: lsp.CompletionItemKind | undefined,
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): languages.CompletionItemKind {
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const k = monaco.languages.CompletionItemKind;
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switch (kind) {
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case 1:
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return k.Text;
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case 2:
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return k.Method;
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case 3:
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return k.Function;
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case 4:
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return k.Constructor;
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case 5:
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return k.Field;
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case 6:
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return k.Variable;
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case 7:
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return k.Class;
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case 8:
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return k.Interface;
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case 9:
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return k.Module;
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case 10:
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return k.Property;
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case 13:
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return k.Enum;
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case 14:
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return k.Keyword;
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case 15:
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return k.Snippet;
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case 21:
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return k.Constant;
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case 22:
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return k.Struct;
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default:
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return k.Text;
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}
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}
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notifyDidOpen(uri: Uri, languageId: string, text: string): void {
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if (!this.connection || this._status !== "ready") return;
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this.documentVersions.set(uri.toString(), 1);
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const params: lsp.DidOpenTextDocumentParams = {
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textDocument: {
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uri: uri.toString(),
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languageId,
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version: 1,
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text,
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},
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};
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trace("→ didOpen", params.textDocument.uri);
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this.connection.sendNotification("textDocument/didOpen", params);
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}
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notifyDidChange(uri: Uri, text: string): void {
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if (!this.connection || this._status !== "ready") return;
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const version = (this.documentVersions.get(uri.toString()) ?? 0) + 1;
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this.documentVersions.set(uri.toString(), version);
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const params: lsp.DidChangeTextDocumentParams = {
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textDocument: { uri: uri.toString(), version },
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contentChanges: [{ text }],
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};
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trace("→ didChange", params.textDocument.uri);
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this.connection.sendNotification("textDocument/didChange", params);
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}
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notifyDidClose(uri: Uri): void {
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if (!this.connection || this._status !== "ready") return;
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this.documentVersions.delete(uri.toString());
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const params: lsp.DidCloseTextDocumentParams = {
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textDocument: { uri: uri.toString() },
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};
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trace("→ didClose", params.textDocument.uri);
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this.connection.sendNotification("textDocument/didClose", params);
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}
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dispose(): void {
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for (const d of this.disposables) d.dispose();
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this.disposables = [];
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this.connection?.dispose();
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this.connection = null;
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if (this.ws && this.ws.readyState !== WebSocket.CLOSED) {
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this.ws.close();
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}
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this.ws = null;
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this.documentVersions.clear();
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this.setStatus("disconnected");
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}
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}
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let globalClient: LspClient | null = null;
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export function getLspClient(): LspClient {
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if (!globalClient) {
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globalClient = new LspClient();
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}
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return globalClient;
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}
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