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// Minimal JSON-RPC 2.0 LSP-like fake server over stdio, for testing the LSP
// client without a real language server binary. Ported from opencode's
// test/fixture/lsp/fake-lsp-server.js (trimmed to what dispatch's client and
// manager exercise: initialize, didOpen/didChange, push + pull diagnostics).
//
// Test hooks (custom JSON-RPC methods the test driver can call):
// test/get-initialize-params → returns the params sent to `initialize`
// test/get-last-change → returns the last `didChange` params
// test/publish-diagnostics → forwards a `publishDiagnostics` push
// test/configure-pull-diagnostics → sets up pull-diagnostic responses
// test/get-diagnostic-request-count→ how many pull requests were received
let nextId = 1;
let readBuffer = Buffer.alloc(0);
let lastChange = null;
let initializeParams = null;
let diagnosticRequestCount = 0;
let registeredCapability = false;
let pullConfig = {
registerOn: undefined,
registrations: [],
documentDiagnostics: [],
workspaceDiagnostics: [],
hasDiagnosticProvider: false,
};
function encode(message) {
const json = JSON.stringify(message);
const header = `Content-Length: ${Buffer.byteLength(json, "utf8")}\r\n\r\n`;
return Buffer.concat([Buffer.from(header, "utf8"), Buffer.from(json, "utf8")]);
}
function decodeFrames(buffer) {
const results = [];
while (true) {
const idx = buffer.indexOf("\r\n\r\n");
if (idx === -1) break;
const header = buffer.slice(0, idx).toString("utf8");
const match = /Content-Length:\s*(\d+)/i.exec(header);
const length = match ? parseInt(match[1], 10) : 0;
const bodyStart = idx + 4;
const bodyEnd = bodyStart + length;
if (buffer.length < bodyEnd) break;
results.push(buffer.slice(bodyStart, bodyEnd).toString("utf8"));
buffer = buffer.slice(bodyEnd);
}
return { messages: results, rest: buffer };
}
function send(message) {
process.stdout.write(encode(message));
}
function sendRequest(method, params) {
const id = nextId++;
send({ jsonrpc: "2.0", id, method, params });
return id;
}
function sendResponse(id, result) {
send({ jsonrpc: "2.0", id, result });
}
function sendNotification(method, params) {
send({ jsonrpc: "2.0", method, params });
}
function maybeRegister(method) {
if (pullConfig.registerOn !== method || registeredCapability) return;
registeredCapability = true;
sendRequest("client/registerCapability", {
registrations: pullConfig.registrations.map((registration, index) => ({
id: registration.id ?? `pull-${index}`,
method: registration.method ?? "textDocument/diagnostic",
registerOptions: registration.registerOptions ?? registration,
})),
});
}
function handle(raw) {
let data;
try {
data = JSON.parse(raw);
} catch {
return;
}
if (data.method === "initialize") {
initializeParams = data.params;
sendResponse(data.id, {
capabilities: {
textDocumentSync: { change: 2, openClose: true },
...(pullConfig.hasDiagnosticProvider
? {
diagnosticProvider: {
identifier: "fake",
interFileDependencies: false,
workspaceDiagnostics: false,
},
}
: {}),
},
});
return;
}
if (data.method === "test/get-initialize-params") {
sendResponse(data.id, initializeParams);
return;
}
if (data.method === "initialized" || data.method === "workspace/didChangeConfiguration") {
return;
}
if (data.method === "textDocument/didOpen") {
maybeRegister("didOpen");
return;
}
if (data.method === "textDocument/didChange") {
lastChange = data.params;
maybeRegister("didChange");
return;
}
if (data.method === "workspace/didChangeWatchedFiles") {
return;
}
if (data.method === "test/configure-pull-diagnostics") {
pullConfig = {
registerOn: data.params?.registerOn,
registrations: data.params?.registrations ?? [],
documentDiagnostics: data.params?.documentDiagnostics ?? [],
workspaceDiagnostics: data.params?.workspaceDiagnostics ?? [],
hasDiagnosticProvider: data.params?.hasDiagnosticProvider ?? false,
};
registeredCapability = false;
sendResponse(data.id, null);
return;
}
if (data.method === "test/publish-diagnostics") {
sendNotification("textDocument/publishDiagnostics", data.params);
sendResponse(data.id, null);
return;
}
if (data.method === "test/get-last-change") {
sendResponse(data.id, lastChange);
return;
}
if (data.method === "test/get-diagnostic-request-count") {
sendResponse(data.id, diagnosticRequestCount);
return;
}
if (data.method === "textDocument/diagnostic") {
diagnosticRequestCount += 1;
sendResponse(data.id, { kind: "full", items: pullConfig.documentDiagnostics });
return;
}
if (data.method === "workspace/diagnostic") {
diagnosticRequestCount += 1;
sendResponse(data.id, { items: pullConfig.workspaceDiagnostics });
return;
}
if (data.method === "textDocument/hover") {
sendResponse(data.id, { contents: { kind: "plaintext", value: "fake hover" } });
return;
}
if (data.method === "textDocument/definition") {
sendResponse(data.id, [
{
uri: data.params?.textDocument?.uri,
range: { start: { line: 0, character: 0 }, end: { line: 0, character: 1 } },
},
]);
return;
}
// Default: respond null to any other request so the client never hangs.
if (typeof data.id !== "undefined") {
sendResponse(data.id, null);
}
}
process.stdin.on("data", (chunk) => {
readBuffer = Buffer.concat([readBuffer, chunk]);
const { messages, rest } = decodeFrames(readBuffer);
readBuffer = rest;
for (const message of messages) handle(message);
});
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