From fa10f7dc23f8b93c0f9ef3fb5477871a20aaa974 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 1 Jun 2022 17:36:44 -0700
Subject: Add language server daemon. (#2251)

* Add language server daemon.

* Fix.

Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: jsmall-nvidia <jsmall@nvidia.com>
Co-authored-by: Theresa Foley <10618364+tangent-vector@users.noreply.github.com>
---
 tools/slangd/language-server.cpp | 184 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 tools/slangd/language-server.cpp

(limited to 'tools/slangd/language-server.cpp')

diff --git a/tools/slangd/language-server.cpp b/tools/slangd/language-server.cpp
new file mode 100644
index 000000000..7cb744ecd
--- /dev/null
+++ b/tools/slangd/language-server.cpp
@@ -0,0 +1,184 @@
+// language-server.cpp
+
+// This file implements the language server for Slang, conforming to the Language Server Protocol.
+// https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <thread>
+
+#include "../../source/core/slang-secure-crt.h"
+#include "../../slang-com-helper.h"
+
+#include "language-server-protocol.h"
+#include "language-server.h"
+
+namespace Slang
+{
+using namespace LanguageServerProtocol;
+
+SlangResult LanguageServer::init(const InitializeParams& args)
+{
+    SLANG_RETURN_ON_FAIL(m_connection->initWithStdStreams());
+    m_workspaceFolders = args.workspaceFolders;
+    return SLANG_OK;
+}
+
+slang::IGlobalSession* LanguageServer::getOrCreateGlobalSession()
+{
+    if (!m_session)
+    {
+        // Just create the global session in the regular way if there isn't one set
+        if (SLANG_FAILED(slang_createGlobalSession(SLANG_API_VERSION, m_session.writeRef())))
+        {
+            return nullptr;
+        }
+    }
+
+    return m_session;
+}
+
+SlangResult LanguageServer::_executeSingle()
+{
+    // If we don't have a message, we can quit for now
+    if (!m_connection->hasMessage())
+    {
+        return SLANG_OK;
+    }
+
+    const JSONRPCMessageType msgType = m_connection->getMessageType();
+
+    switch (msgType)
+    {
+    case JSONRPCMessageType::Call:
+        {
+            JSONRPCCall call;
+            SLANG_RETURN_ON_FAIL(m_connection->getRPCOrSendError(&call));
+
+            // Do different things
+            if (call.method == ExitParams::methodName)
+            {
+                m_quit = true;
+                return SLANG_OK;
+            }
+            else if (call.method == ShutdownParams::methodName)
+            {
+                m_connection->sendResult(NullResponse::get(), call.id);
+                return SLANG_OK;
+            }
+            else if (call.method == InitializeParams::methodName)
+            {
+                InitializeParams args = {};
+                SLANG_RETURN_ON_FAIL(
+                    m_connection->toNativeArgsOrSendError(call.params, &args, call.id));
+
+                init(args);
+
+                InitializeResult result = {};
+                result.serverInfo.name = "SlangLanguageServer";
+                result.serverInfo.version = "1.0";
+                result.capabilities.positionEncoding = "utf-8";
+                result.capabilities.textDocumentSync.openClose = true;
+                result.capabilities.textDocumentSync.change = (int)TextDocumentSyncKind::Full;
+                m_connection->sendResult(&result, call.id);
+                return SLANG_OK;
+            }
+            else if (call.method == DidOpenTextDocumentParams::methodName)
+            {
+                DidOpenTextDocumentParams args;
+                SLANG_RETURN_ON_FAIL(
+                    m_connection->toNativeArgsOrSendError(call.params, &args, call.id));
+                return didOpenTextDocument(args);
+            }
+            else if (call.method == DidCloseTextDocumentParams::methodName)
+            {
+                DidCloseTextDocumentParams args;
+                SLANG_RETURN_ON_FAIL(
+                    m_connection->toNativeArgsOrSendError(call.params, &args, call.id));
+                return didCloseTextDocument(args);
+            }
+            else if (call.method == DidChangeTextDocumentParams::methodName)
+            {
+                DidChangeTextDocumentParams args;
+                SLANG_RETURN_ON_FAIL(
+                    m_connection->toNativeArgsOrSendError(call.params, &args, call.id));
+                return didChangeTextDocument(args);
+            }
+            else if (call.method == "initialized")
+            {
+                return SLANG_OK;
+            }
+            else
+            {
+                return m_connection->sendError(JSONRPC::ErrorCode::MethodNotFound, call.id);
+            }
+        }
+    default:
+        {
+            return m_connection->sendError(
+                JSONRPC::ErrorCode::InvalidRequest, m_connection->getCurrentMessageId());
+        }
+    }
+
+    return SLANG_OK;
+}
+
+SlangResult LanguageServer::didOpenTextDocument(const DidOpenTextDocumentParams& args)
+{
+    return SLANG_OK;
+}
+SlangResult LanguageServer::didCloseTextDocument(const DidCloseTextDocumentParams& args)
+{
+    return SLANG_OK;
+}
+SlangResult LanguageServer::didChangeTextDocument(const DidChangeTextDocumentParams& args)
+{
+    return SLANG_OK;
+}
+
+void LanguageServer::update()
+{
+
+}
+
+SlangResult LanguageServer::execute()
+{
+    m_connection = new JSONRPCConnection();
+    m_connection->initWithStdStreams();
+    while (m_connection->isActive() && !m_quit)
+    {
+        // Consume all messages first.
+        while (m_connection->tryReadMessage() == SLANG_OK)
+        {
+            const SlangResult res = _executeSingle();
+        }
+
+        // Now we can use this time to reparse user's code, report diagnostics, etc.
+        update();
+    }
+
+    return SLANG_OK;
+}
+
+} // namespace LanguageServer
+
+int main(int argc, const char* const* argv)
+{
+    bool isDebug = false;
+    for (auto i = 1; i < argc; i++)
+    {
+        if (Slang::UnownedStringSlice(argv[i]) == "--debug")
+        {
+            isDebug = true;
+        }
+    }
+    if (isDebug)
+    {
+        std::this_thread::sleep_for(std::chrono::seconds(10));
+    }
+    Slang::LanguageServer server;
+    SLANG_RETURN_ON_FAIL(server.execute());
+    return 0;
+}
-- 
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