Add GDScript Language Protocol plugin

15 files changed, 2479 insertions, 0 deletions

diff --git a/modules/gdscript/SCsub b/modules/gdscript/SCsub
index 6904154953..6285e6bb54 100644
--- a/modules/gdscript/SCsub
+++ b/modules/gdscript/SCsub
@@ -9,3 +9,4 @@ env_gdscript.add_source_files(env.modules_sources, "*.cpp")
 
 if env['tools']:
 	env_gdscript.add_source_files(env.modules_sources, "./editor/*.cpp")
+	env_gdscript.add_source_files(env.modules_sources, "./language_server/*.cpp")
diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index 9a25e788c7..7c73ae0793 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -8255,6 +8255,10 @@ int GDScriptParser::get_error_column() const {
 	return error_column;
 }
 
+bool GDScriptParser::has_error() const {
+	return error_set;
+}
+
 Error GDScriptParser::_parse(const String &p_base_path) {
 
 	base_path = p_base_path;
diff --git a/modules/gdscript/gdscript_parser.h b/modules/gdscript/gdscript_parser.h
index 62d7bdb393..72aa819a8c 100644
--- a/modules/gdscript/gdscript_parser.h
+++ b/modules/gdscript/gdscript_parser.h
@@ -632,6 +632,7 @@ private:
 	Error _parse(const String &p_base_path);
 
 public:
+	bool has_error() const;
 	String get_error() const;
 	int get_error_line() const;
 	int get_error_column() const;
diff --git a/modules/gdscript/language_server/gdscript_extend_parser.cpp b/modules/gdscript/language_server/gdscript_extend_parser.cpp
new file mode 100644
index 0000000000..32437f663a
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_extend_parser.cpp
@@ -0,0 +1,237 @@
+/*************************************************************************/
+/*  gdscript_extend_parser.cpp                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "gdscript_extend_parser.h"
+#include "../gdscript.h"
+
+void ExtendGDScriptParser::update_diagnostics() {
+
+	diagnostics.clear();
+
+	if (has_error()) {
+		lsp::Diagnostic diagnostic;
+		diagnostic.severity = lsp::DiagnosticSeverity::Error;
+		diagnostic.message = get_error();
+		diagnostic.source = "gdscript";
+		diagnostic.code = -1;
+		lsp::Range range;
+		lsp::Position pos;
+		int line = get_error_line() - 1;
+		const String &line_text = get_lines()[line];
+		pos.line = line;
+		pos.character = line_text.length() - line_text.strip_edges(true, false).length();
+		range.start = pos;
+		range.end = range.start;
+		range.end.character = line_text.strip_edges(false).length();
+		diagnostic.range = range;
+		diagnostics.push_back(diagnostic);
+	}
+
+	const List<GDScriptWarning> &warnings = get_warnings();
+	for (const List<GDScriptWarning>::Element *E = warnings.front(); E; E = E->next()) {
+		const GDScriptWarning &warning = E->get();
+		lsp::Diagnostic diagnostic;
+		diagnostic.severity = lsp::DiagnosticSeverity::Warning;
+		diagnostic.message = warning.get_message();
+		diagnostic.source = "gdscript";
+		diagnostic.code = warning.code;
+		lsp::Range range;
+		lsp::Position pos;
+		int line = warning.line - 1;
+		const String &line_text = get_lines()[line];
+		pos.line = line;
+		pos.character = line_text.length() - line_text.strip_edges(true, false).length();
+		range.start = pos;
+		range.end = pos;
+		range.end.character = line_text.strip_edges(false).length();
+		diagnostic.range = range;
+		diagnostics.push_back(diagnostic);
+	}
+}
+
+void ExtendGDScriptParser::update_symbols() {
+	const GDScriptParser::Node *head = get_parse_tree();
+	if (const GDScriptParser::ClassNode *gdclass = dynamic_cast<const GDScriptParser::ClassNode *>(head)) {
+		parse_class_symbol(gdclass, class_symbol);
+	}
+}
+
+void ExtendGDScriptParser::parse_class_symbol(const GDScriptParser::ClassNode *p_class, lsp::DocumentSymbol &r_symbol) {
+	r_symbol.children.clear();
+	r_symbol.name = p_class->name;
+	if (r_symbol.name.empty())
+		r_symbol.name = path.get_file();
+	r_symbol.kind = lsp::SymbolKind::Class;
+	r_symbol.detail = p_class->get_datatype().to_string();
+	r_symbol.deprecated = false;
+	r_symbol.range.start.line = p_class->line - 1;
+	r_symbol.range.start.character = p_class->column;
+	r_symbol.range.end.line = p_class->end_line - 1;
+	r_symbol.selectionRange.start.line = r_symbol.range.start.line;
+
+	for (int i = 0; i < p_class->variables.size(); ++i) {
+
+		const GDScriptParser::ClassNode::Member &m = p_class->variables[i];
+
+		lsp::DocumentSymbol symbol;
+		symbol.name = m.identifier;
+		symbol.kind = lsp::SymbolKind::Variable;
+		symbol.detail = m.data_type.to_string();
+		symbol.deprecated = false;
+		const int line = m.line - 1;
+		symbol.range.start.line = line;
+		symbol.range.start.character = lines[line].length() - lines[line].strip_edges(true, false).length();
+		symbol.range.end.line = line;
+		symbol.range.end.character = lines[line].length();
+		symbol.selectionRange.start.line = symbol.range.start.line;
+
+		r_symbol.children.push_back(symbol);
+	}
+
+	for (int i = 0; i < p_class->_signals.size(); ++i) {
+		const GDScriptParser::ClassNode::Signal &signal = p_class->_signals[i];
+
+		lsp::DocumentSymbol symbol;
+		symbol.name = signal.name;
+		symbol.kind = lsp::SymbolKind::Event;
+		symbol.deprecated = false;
+		const int line = signal.line - 1;
+		symbol.range.start.line = line;
+		symbol.range.start.character = lines[line].length() - lines[line].strip_edges(true, false).length();
+		symbol.range.end.line = symbol.range.start.line;
+		symbol.range.end.character = lines[line].length();
+		symbol.selectionRange.start.line = symbol.range.start.line;
+
+		r_symbol.children.push_back(symbol);
+	}
+
+	for (Map<StringName, GDScriptParser::ClassNode::Constant>::Element *E = p_class->constant_expressions.front(); E; E = E->next()) {
+		lsp::DocumentSymbol symbol;
+		symbol.name = E->key();
+		symbol.kind = lsp::SymbolKind::Constant;
+		symbol.deprecated = false;
+		const int line = E->get().expression->line - 1;
+		symbol.range.start.line = line;
+		symbol.range.start.character = E->get().expression->column;
+		symbol.range.end.line = symbol.range.start.line;
+		symbol.range.end.character = lines[line].length();
+		symbol.selectionRange.start.line = symbol.range.start.line;
+
+		r_symbol.children.push_back(symbol);
+	}
+
+	for (int i = 0; i < p_class->functions.size(); ++i) {
+		const GDScriptParser::FunctionNode *func = p_class->functions[i];
+		lsp::DocumentSymbol symbol;
+		parse_function_symbol(func, symbol);
+		r_symbol.children.push_back(symbol);
+	}
+
+	for (int i = 0; i < p_class->static_functions.size(); ++i) {
+		const GDScriptParser::FunctionNode *func = p_class->static_functions[i];
+		lsp::DocumentSymbol symbol;
+		parse_function_symbol(func, symbol);
+		r_symbol.children.push_back(symbol);
+	}
+
+	for (int i = 0; i < p_class->subclasses.size(); ++i) {
+		const GDScriptParser::ClassNode *subclass = p_class->subclasses[i];
+		lsp::DocumentSymbol symbol;
+		parse_class_symbol(subclass, symbol);
+		r_symbol.children.push_back(symbol);
+	}
+}
+
+void ExtendGDScriptParser::parse_function_symbol(const GDScriptParser::FunctionNode *p_func, lsp::DocumentSymbol &r_symbol) {
+	r_symbol.name = p_func->name;
+	r_symbol.kind = lsp::SymbolKind::Function;
+	r_symbol.detail = p_func->get_datatype().to_string();
+	r_symbol.deprecated = false;
+	const int line = p_func->line - 1;
+	r_symbol.range.start.line = line;
+	r_symbol.range.start.character = p_func->column;
+	r_symbol.range.end.line = MAX(p_func->body->end_line - 2, p_func->body->line);
+	r_symbol.range.end.character = lines[r_symbol.range.end.line].length();
+	r_symbol.selectionRange.start.line = r_symbol.range.start.line;
+
+	for (const Map<StringName, LocalVarNode *>::Element *E = p_func->body->variables.front(); E; E = E->next()) {
+		lsp::DocumentSymbol symbol;
+		symbol.name = E->key();
+		symbol.kind = lsp::SymbolKind::Variable;
+		symbol.range.start.line = E->get()->line - 1;
+		symbol.range.start.character = E->get()->column;
+		symbol.range.end.line = symbol.range.start.line;
+		symbol.range.end.character = lines[symbol.range.end.line].length();
+		r_symbol.children.push_back(symbol);
+	}
+	for (int i = 0; i < p_func->arguments.size(); i++) {
+		lsp::DocumentSymbol symbol;
+		symbol.kind = lsp::SymbolKind::Variable;
+		symbol.name = p_func->arguments[i];
+		symbol.range.start.line = p_func->body->line - 1;
+		symbol.range.start.character = p_func->body->column;
+		symbol.range.end = symbol.range.start;
+		r_symbol.children.push_back(symbol);
+	}
+}
+
+String ExtendGDScriptParser::get_text_for_completion(const lsp::Position &p_cursor) {
+
+	String longthing;
+	int len = lines.size();
+	for (int i = 0; i < len; i++) {
+
+		if (i == p_cursor.line) {
+			longthing += lines[i].substr(0, p_cursor.character);
+			longthing += String::chr(0xFFFF); //not unicode, represents the cursor
+			longthing += lines[i].substr(p_cursor.character, lines[i].size());
+		} else {
+
+			longthing += lines[i];
+		}
+
+		if (i != len - 1)
+			longthing += "\n";
+	}
+
+	return longthing;
+}
+
+Error ExtendGDScriptParser::parse(const String &p_code, const String &p_path) {
+	path = p_path;
+	code = p_code;
+	lines = p_code.split("\n");
+
+	Error err = GDScriptParser::parse(p_code, p_path.get_base_dir(), false, p_path, false, NULL, false);
+	update_diagnostics();
+	update_symbols();
+
+	return err;
+}
diff --git a/modules/gdscript/language_server/gdscript_extend_parser.h b/modules/gdscript/language_server/gdscript_extend_parser.h
new file mode 100644
index 0000000000..60af5c7465
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_extend_parser.h
@@ -0,0 +1,64 @@
+/*************************************************************************/
+/*  gdscript_extend_parser.h                                             */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GDSCRIPT_EXTEND_PARSER_H
+#define GDSCRIPT_EXTEND_PARSER_H
+
+#include "../gdscript_parser.h"
+#include "core/variant.h"
+#include "lsp.hpp"
+
+class ExtendGDScriptParser : public GDScriptParser {
+	String path;
+	String code;
+	Vector<String> lines;
+
+	lsp::DocumentSymbol class_symbol;
+	Vector<lsp::Diagnostic> diagnostics;
+
+	void update_diagnostics();
+	void update_symbols();
+
+	void parse_class_symbol(const GDScriptParser::ClassNode *p_class, lsp::DocumentSymbol &r_symbol);
+	void parse_function_symbol(const GDScriptParser::FunctionNode *p_func, lsp::DocumentSymbol &r_symbol);
+
+public:
+	_FORCE_INLINE_ const String &get_path() const { return path; }
+	_FORCE_INLINE_ const String &get_code() const { return code; }
+	_FORCE_INLINE_ const Vector<String> &get_lines() const { return lines; }
+	_FORCE_INLINE_ const lsp::DocumentSymbol &get_symbols() const { return class_symbol; }
+	_FORCE_INLINE_ const Vector<lsp::Diagnostic> &get_diagnostics() const { return diagnostics; }
+
+	String get_text_for_completion(const lsp::Position &p_cursor);
+
+	Error parse(const String &p_code, const String &p_path);
+};
+
+#endif
diff --git a/modules/gdscript/language_server/gdscript_language_protocol.cpp b/modules/gdscript/language_server/gdscript_language_protocol.cpp
new file mode 100644
index 0000000000..b4c4d7f236
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_language_protocol.cpp
@@ -0,0 +1,173 @@
+/*************************************************************************/
+/*  gdscript_language_protocol.cpp                                       */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "gdscript_language_protocol.h"
+#include "core/io/json.h"
+#include "core/os/copymem.h"
+#include "core/project_settings.h"
+
+GDScriptLanguageProtocol *GDScriptLanguageProtocol::singleton = NULL;
+
+void GDScriptLanguageProtocol::on_data_received(int p_id) {
+	lastest_client_id = p_id;
+	Ref<WebSocketPeer> peer = server->get_peer(p_id);
+	PoolByteArray data;
+	if (OK == peer->get_packet_buffer(data)) {
+		String message;
+		message.parse_utf8((const char *)data.read().ptr(), data.size());
+		if (message.begins_with("Content-Length:")) return;
+		String output = process_message(message);
+		if (!output.empty()) {
+			CharString charstr = output.utf8();
+			peer->put_packet((const uint8_t *)charstr.ptr(), charstr.length());
+		}
+	}
+}
+
+void GDScriptLanguageProtocol::on_client_connected(int p_id, const String &p_protocal) {
+	clients.set(p_id, server->get_peer(p_id));
+}
+
+void GDScriptLanguageProtocol::on_client_disconnected(int p_id, bool p_was_clean_close) {
+	clients.erase(p_id);
+}
+
+String GDScriptLanguageProtocol::process_message(const String &p_text) {
+	String ret = process_string(p_text);
+	if (ret.empty()) {
+		return ret;
+	} else {
+		return format_output(ret);
+	}
+}
+
+String GDScriptLanguageProtocol::format_output(const String &p_text) {
+
+	String header = "Content-Length: ";
+	CharString charstr = p_text.utf8();
+	size_t len = charstr.length();
+	header += itos(len);
+	header += "\r\n\r\n";
+
+	return header + p_text;
+}
+
+void GDScriptLanguageProtocol::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("initialize", "params"), &GDScriptLanguageProtocol::initialize);
+	ClassDB::bind_method(D_METHOD("initialized", "params"), &GDScriptLanguageProtocol::initialized);
+	ClassDB::bind_method(D_METHOD("on_data_received"), &GDScriptLanguageProtocol::on_data_received);
+	ClassDB::bind_method(D_METHOD("on_client_connected"), &GDScriptLanguageProtocol::on_client_connected);
+	ClassDB::bind_method(D_METHOD("on_client_disconnected"), &GDScriptLanguageProtocol::on_client_disconnected);
+}
+
+Dictionary GDScriptLanguageProtocol::initialize(const Dictionary &p_params) {
+
+	lsp::InitializeResult ret;
+
+	return ret.to_json();
+}
+
+void GDScriptLanguageProtocol::initialized(const Variant &p_params) {
+
+	Dictionary params;
+	params["type"] = 3;
+	params["message"] = "GDScript Language Server initialized!";
+	Dictionary test_message = make_notification("window/showMessage", params);
+
+	if (Ref<WebSocketPeer> *peer = clients.getptr(lastest_client_id)) {
+		String msg = JSON::print(test_message);
+		msg = format_output(msg);
+		CharString charstr = msg.utf8();
+		(*peer)->put_packet((const uint8_t *)charstr.ptr(), charstr.length());
+	}
+}
+
+void GDScriptLanguageProtocol::poll() {
+	server->poll();
+}
+
+Error GDScriptLanguageProtocol::start(int p_port) {
+	if (server == NULL) {
+		server = dynamic_cast<WebSocketServer *>(ClassDB::instance("WebSocketServer"));
+		server->set_buffers(8192, 1024, 8192, 1024); // 8mb should be way more than enough
+		server->connect("data_received", this, "on_data_received");
+		server->connect("client_connected", this, "on_client_connected");
+		server->connect("client_disconnected", this, "on_client_disconnected");
+	}
+	return server->listen(p_port);
+}
+
+void GDScriptLanguageProtocol::stop() {
+	server->stop();
+}
+
+void GDScriptLanguageProtocol::notify_all_clients(const String &p_method, const Variant &p_params) {
+
+	Dictionary message = make_notification(p_method, p_params);
+	String msg = JSON::print(message);
+	msg = format_output(msg);
+	CharString charstr = msg.utf8();
+	const int *p_id = clients.next(NULL);
+	while (p_id != NULL) {
+		Ref<WebSocketPeer> peer = clients.get(*p_id);
+		(*peer)->put_packet((const uint8_t *)charstr.ptr(), charstr.length());
+		p_id = clients.next(p_id);
+	}
+}
+
+void GDScriptLanguageProtocol::notify_client(const String &p_method, const Variant &p_params, int p_client) {
+
+	if (p_client == -1) {
+		p_client = lastest_client_id;
+	}
+
+	Ref<WebSocketPeer> *peer = clients.getptr(p_client);
+	ERR_FAIL_COND(peer == NULL);
+
+	Dictionary message = make_notification(p_method, p_params);
+	String msg = JSON::print(message);
+	msg = format_output(msg);
+	CharString charstr = msg.utf8();
+
+	(*peer)->put_packet((const uint8_t *)charstr.ptr(), charstr.length());
+}
+
+GDScriptLanguageProtocol::GDScriptLanguageProtocol() {
+	server = NULL;
+	singleton = this;
+	set_scope("textDocument", &text_document);
+	set_scope("workspace", &workspace);
+	workspace.root = ProjectSettings::get_singleton()->get_resource_path();
+}
+
+GDScriptLanguageProtocol::~GDScriptLanguageProtocol() {
+	memdelete(server);
+	server = NULL;
+}
diff --git a/modules/gdscript/language_server/gdscript_language_protocol.h b/modules/gdscript/language_server/gdscript_language_protocol.h
new file mode 100644
index 0000000000..c6495250c1
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_language_protocol.h
@@ -0,0 +1,86 @@
+/*************************************************************************/
+/*  gdscript_language_protocol.h                                         */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GDSCRIPT_PROTOCAL_SERVER_H
+#define GDSCRIPT_PROTOCAL_SERVER_H
+
+#include "gdscript_text_document.h"
+#include "gdscript_workspace.h"
+#include "lsp.hpp"
+#include "modules/jsonrpc/jsonrpc.h"
+#include "modules/websocket/websocket_peer.h"
+#include "modules/websocket/websocket_server.h"
+
+class GDScriptLanguageProtocol : public JSONRPC {
+	GDCLASS(GDScriptLanguageProtocol, JSONRPC)
+
+	enum LSPErrorCode {
+		RequestCancelled = -32800,
+		ContentModified = -32801,
+	};
+
+	static GDScriptLanguageProtocol *singleton;
+
+	HashMap<int, Ref<WebSocketPeer> > clients;
+	WebSocketServer *server;
+	int lastest_client_id;
+
+	GDScriptTextDocument text_document;
+	GDScriptWorkspace workspace;
+
+	void on_data_received(int p_id);
+	void on_client_connected(int p_id, const String &p_protocal);
+	void on_client_disconnected(int p_id, bool p_was_clean_close);
+
+	String process_message(const String &p_text);
+	String format_output(const String &p_text);
+
+protected:
+	static void _bind_methods();
+
+	Dictionary initialize(const Dictionary &p_params);
+	void initialized(const Variant &p_params);
+
+public:
+	_FORCE_INLINE_ static GDScriptLanguageProtocol *get_singleton() { return singleton; }
+	_FORCE_INLINE_ GDScriptWorkspace &get_workspace() { return workspace; }
+
+	void poll();
+	Error start(int p_port);
+	void stop();
+
+	void notify_all_clients(const String &p_method, const Variant &p_params = Variant());
+	void notify_client(const String &p_method, const Variant &p_params = Variant(), int p_client = -1);
+
+	GDScriptLanguageProtocol();
+	~GDScriptLanguageProtocol();
+};
+
+#endif
diff --git a/modules/gdscript/language_server/gdscript_language_server.cpp b/modules/gdscript/language_server/gdscript_language_server.cpp
new file mode 100644
index 0000000000..63ced28ddd
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_language_server.cpp
@@ -0,0 +1,86 @@
+/*************************************************************************/
+/*  gdscript_language_server.cpp                                         */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "gdscript_language_server.h"
+#include "core/os/file_access.h"
+#include "core/os/os.h"
+#include "editor/editor_node.h"
+
+GDScriptLanguageServer::GDScriptLanguageServer() {
+	thread = NULL;
+	thread_exit = false;
+	_EDITOR_DEF("network/language_server/remote_port", 6008);
+}
+
+void GDScriptLanguageServer::_notification(int p_what) {
+
+	switch (p_what) {
+		case NOTIFICATION_ENTER_TREE:
+			start();
+			break;
+		case NOTIFICATION_EXIT_TREE:
+			stop();
+			break;
+	}
+}
+
+void GDScriptLanguageServer::thread_main(void *p_userdata) {
+	GDScriptLanguageServer *self = static_cast<GDScriptLanguageServer *>(p_userdata);
+	while (!self->thread_exit) {
+		self->protocol.poll();
+		OS::get_singleton()->delay_usec(10);
+	}
+}
+
+void GDScriptLanguageServer::start() {
+	int port = (int)_EDITOR_GET("network/language_server/remote_port");
+	if (protocol.start(port) == OK) {
+		EditorNode::get_log()->add_message("** GDScript Language Server Started **");
+		ERR_FAIL_COND(thread != NULL || thread_exit);
+		thread_exit = false;
+		thread = Thread::create(GDScriptLanguageServer::thread_main, this);
+	}
+}
+
+void GDScriptLanguageServer::stop() {
+	ERR_FAIL_COND(NULL == thread || thread_exit);
+	thread_exit = true;
+	Thread::wait_to_finish(thread);
+	memdelete(thread);
+	thread = NULL;
+	protocol.stop();
+	EditorNode::get_log()->add_message("** GDScript Language Server Stopped **");
+}
+
+void register_lsp_types() {
+	ClassDB::register_class<GDScriptLanguageProtocol>();
+	ClassDB::register_class<GDScriptTextDocument>();
+	ClassDB::register_class<GDScriptWorkspace>();
+}
diff --git a/modules/gdscript/language_server/gdscript_language_server.h b/modules/gdscript/language_server/gdscript_language_server.h
new file mode 100644
index 0000000000..83c2320d98
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_language_server.h
@@ -0,0 +1,60 @@
+/*************************************************************************/
+/*  gdscript_language_server.h                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GDSCRIPT_LANGUAGE_SERVER_H
+#define GDSCRIPT_LANGUAGE_SERVER_H
+
+#include "../gdscript_parser.h"
+#include "editor/editor_plugin.h"
+#include "gdscript_language_protocol.h"
+
+class GDScriptLanguageServer : public EditorPlugin {
+	GDCLASS(GDScriptLanguageServer, EditorPlugin);
+
+	GDScriptLanguageProtocol protocol;
+
+	Thread *thread;
+	bool thread_exit;
+	static void thread_main(void *p_userdata);
+
+private:
+	void _notification(int p_what);
+	void _iteration();
+
+public:
+	Error parse_script_file(const String &p_path);
+	GDScriptLanguageServer();
+	void start();
+	void stop();
+};
+
+void register_lsp_types();
+
+#endif // GDSCRIPT_LANGUAGE_SERVER_H
diff --git a/modules/gdscript/language_server/gdscript_text_document.cpp b/modules/gdscript/language_server/gdscript_text_document.cpp
new file mode 100644
index 0000000000..ac4b4363e2
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_text_document.cpp
@@ -0,0 +1,177 @@
+/*************************************************************************/
+/*  gdscript_text_document.cpp                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "gdscript_text_document.h"
+#include "../gdscript.h"
+#include "gdscript_language_protocol.h"
+
+void GDScriptTextDocument::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("didOpen"), &GDScriptTextDocument::didOpen);
+	ClassDB::bind_method(D_METHOD("didChange"), &GDScriptTextDocument::didChange);
+	ClassDB::bind_method(D_METHOD("documentSymbol"), &GDScriptTextDocument::documentSymbol);
+	ClassDB::bind_method(D_METHOD("completion"), &GDScriptTextDocument::completion);
+	ClassDB::bind_method(D_METHOD("foldingRange"), &GDScriptTextDocument::foldingRange);
+	ClassDB::bind_method(D_METHOD("codeLens"), &GDScriptTextDocument::codeLens);
+	ClassDB::bind_method(D_METHOD("documentLink"), &GDScriptTextDocument::documentLink);
+	ClassDB::bind_method(D_METHOD("colorPresentation"), &GDScriptTextDocument::colorPresentation);
+	ClassDB::bind_method(D_METHOD("hover"), &GDScriptTextDocument::hover);
+}
+
+void GDScriptTextDocument::didOpen(const Variant &p_param) {
+	lsp::TextDocumentItem doc = load_document_item(p_param);
+	sync_script_content(doc.uri, doc.text);
+}
+
+void GDScriptTextDocument::didChange(const Variant &p_param) {
+	lsp::TextDocumentItem doc = load_document_item(p_param);
+	Dictionary dict = p_param;
+	Array contentChanges = dict["contentChanges"];
+	for (int i = 0; i < contentChanges.size(); ++i) {
+		lsp::TextDocumentContentChangeEvent evt;
+		evt.load(contentChanges[i]);
+		doc.text = evt.text;
+	}
+	sync_script_content(doc.uri, doc.text);
+}
+
+lsp::TextDocumentItem GDScriptTextDocument::load_document_item(const Variant &p_param) {
+	lsp::TextDocumentItem doc;
+	Dictionary params = p_param;
+	doc.load(params["textDocument"]);
+	print_line(doc.text);
+	return doc;
+}
+
+Array GDScriptTextDocument::documentSymbol(const Dictionary &p_params) {
+	Dictionary params = p_params["textDocument"];
+	String uri = params["uri"];
+	String path = GDScriptLanguageProtocol::get_singleton()->get_workspace().get_file_path(uri);
+	Array arr;
+	if (const Map<String, ExtendGDScriptParser *>::Element *parser = GDScriptLanguageProtocol::get_singleton()->get_workspace().scripts.find(path)) {
+		Vector<lsp::SymbolInformation> list;
+		parser->get()->get_symbols().symbol_tree_as_list(uri, list);
+		for (int i = 0; i < list.size(); i++) {
+			arr.push_back(list[i].to_json());
+		}
+	}
+	return arr;
+}
+
+Array GDScriptTextDocument::completion(const Dictionary &p_params) {
+	Array arr;
+
+	lsp::CompletionParams params;
+	params.load(p_params);
+	Dictionary request_data = params.to_json();
+
+	List<ScriptCodeCompletionOption> options;
+	GDScriptLanguageProtocol::get_singleton()->get_workspace().completion(params, &options);
+
+	for (const List<ScriptCodeCompletionOption>::Element *E = options.front(); E; E = E->next()) {
+		const ScriptCodeCompletionOption &option = E->get();
+		lsp::CompletionItem item;
+		item.label = option.display;
+		item.insertText = option.insert_text;
+		item.data = request_data;
+
+		if (params.context.triggerKind == lsp::CompletionTriggerKind::TriggerCharacter && (params.context.triggerCharacter == "'" || params.context.triggerCharacter == "\"") && (option.insert_text.begins_with("'") || option.insert_text.begins_with("\""))) {
+			item.insertText = option.insert_text.substr(1, option.insert_text.length() - 2);
+		}
+
+		switch (option.kind) {
+			case ScriptCodeCompletionOption::KIND_ENUM:
+				item.kind = lsp::CompletionItemKind::Enum;
+				break;
+			case ScriptCodeCompletionOption::KIND_CLASS:
+				item.kind = lsp::CompletionItemKind::Class;
+				break;
+			case ScriptCodeCompletionOption::KIND_MEMBER:
+				item.kind = lsp::CompletionItemKind::Property;
+				break;
+			case ScriptCodeCompletionOption::KIND_FUNCTION:
+				item.kind = lsp::CompletionItemKind::Method;
+				break;
+			case ScriptCodeCompletionOption::KIND_SIGNAL:
+				item.kind = lsp::CompletionItemKind::Event;
+				break;
+			case ScriptCodeCompletionOption::KIND_CONSTANT:
+				item.kind = lsp::CompletionItemKind::Constant;
+				break;
+			case ScriptCodeCompletionOption::KIND_VARIABLE:
+				item.kind = lsp::CompletionItemKind::Variable;
+				break;
+			case ScriptCodeCompletionOption::KIND_FILE_PATH:
+				item.kind = lsp::CompletionItemKind::File;
+				break;
+			case ScriptCodeCompletionOption::KIND_NODE_PATH:
+				item.kind = lsp::CompletionItemKind::Snippet;
+				break;
+			case ScriptCodeCompletionOption::KIND_PLAIN_TEXT:
+				item.kind = lsp::CompletionItemKind::Text;
+				break;
+		}
+
+		arr.push_back(item.to_json());
+	}
+
+	return arr;
+}
+
+Array GDScriptTextDocument::foldingRange(const Dictionary &p_params) {
+	Dictionary params = p_params["textDocument"];
+	String path = params["uri"];
+	Array arr;
+	return arr;
+}
+
+Array GDScriptTextDocument::codeLens(const Dictionary &p_params) {
+	Array arr;
+	return arr;
+}
+
+Variant GDScriptTextDocument::documentLink(const Dictionary &p_params) {
+	Variant ret;
+	return ret;
+}
+
+Array GDScriptTextDocument::colorPresentation(const Dictionary &p_params) {
+	Array arr;
+	return arr;
+}
+
+Variant GDScriptTextDocument::hover(const Dictionary &p_params) {
+	Variant ret;
+	return ret;
+}
+
+void GDScriptTextDocument::sync_script_content(const String &p_uri, const String &p_content) {
+	String path = GDScriptLanguageProtocol::get_singleton()->get_workspace().get_file_path(p_uri);
+	GDScriptLanguageProtocol::get_singleton()->get_workspace().parse_script(path, p_content);
+}
diff --git a/modules/gdscript/language_server/gdscript_text_document.h b/modules/gdscript/language_server/gdscript_text_document.h
new file mode 100644
index 0000000000..f1612b5a8c
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_text_document.h
@@ -0,0 +1,60 @@
+/*************************************************************************/
+/*  gdscript_text_document.h                                             */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GDSCRIPT_TEXT_DOCUMENT_H
+#define GDSCRIPT_TEXT_DOCUMENT_H
+
+#include "core/reference.h"
+#include "lsp.hpp"
+
+class GDScriptTextDocument : public Reference {
+	GDCLASS(GDScriptTextDocument, Reference)
+protected:
+	static void _bind_methods();
+
+	void didOpen(const Variant &p_param);
+	void didChange(const Variant &p_param);
+
+	void sync_script_content(const String &p_path, const String &p_content);
+
+private:
+	lsp::TextDocumentItem load_document_item(const Variant &p_param);
+
+public:
+	Array documentSymbol(const Dictionary &p_params);
+	Array completion(const Dictionary &p_params);
+	Array foldingRange(const Dictionary &p_params);
+	Array codeLens(const Dictionary &p_params);
+	Variant documentLink(const Dictionary &p_params);
+	Array colorPresentation(const Dictionary &p_params);
+	Variant hover(const Dictionary &p_params);
+};
+
+#endif
diff --git a/modules/gdscript/language_server/gdscript_workspace.cpp b/modules/gdscript/language_server/gdscript_workspace.cpp
new file mode 100644
index 0000000000..7833fa5453
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_workspace.cpp
@@ -0,0 +1,153 @@
+/*************************************************************************/
+/*  gdscript_workspace.cpp                                               */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "gdscript_workspace.h"
+#include "../gdscript.h"
+#include "../gdscript_parser.h"
+#include "core/project_settings.h"
+#include "gdscript_language_protocol.h"
+
+void GDScriptWorkspace::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("symbol"), &GDScriptWorkspace::symbol);
+}
+
+void GDScriptWorkspace::remove_cache_parser(const String &p_path) {
+	Map<String, ExtendGDScriptParser *>::Element *parser = parse_results.find(p_path);
+	Map<String, ExtendGDScriptParser *>::Element *script = scripts.find(p_path);
+	if (parser && script) {
+		if (script->get() && script->get() == script->get()) {
+			memdelete(script->get());
+		} else {
+			memdelete(script->get());
+			memdelete(parser->get());
+		}
+		parse_results.erase(p_path);
+		scripts.erase(p_path);
+	} else if (parser) {
+		memdelete(parser->get());
+		parse_results.erase(p_path);
+	} else if (script) {
+		memdelete(script->get());
+		scripts.erase(p_path);
+	}
+}
+
+Array GDScriptWorkspace::symbol(const Dictionary &p_params) {
+	String query = p_params["query"];
+	Array arr;
+	if (!query.empty()) {
+		for (Map<String, ExtendGDScriptParser *>::Element *E = scripts.front(); E; E = E->next()) {
+			Vector<lsp::SymbolInformation> script_symbols;
+			E->get()->get_symbols().symbol_tree_as_list(E->key(), script_symbols);
+			for (int i = 0; i < script_symbols.size(); ++i) {
+				if (query.is_subsequence_ofi(script_symbols[i].name)) {
+					arr.push_back(script_symbols[i].to_json());
+				}
+			}
+		}
+	}
+	return arr;
+}
+
+Error GDScriptWorkspace::parse_script(const String &p_path, const String &p_content) {
+	ExtendGDScriptParser *parser = memnew(ExtendGDScriptParser);
+	Error err = parser->parse(p_content, p_path);
+	Map<String, ExtendGDScriptParser *>::Element *last_parser = parse_results.find(p_path);
+	Map<String, ExtendGDScriptParser *>::Element *last_script = scripts.find(p_path);
+
+	if (err == OK) {
+		remove_cache_parser(p_path);
+		parse_results[p_path] = parser;
+		scripts[p_path] = parser;
+	} else {
+		if (last_parser && last_script && last_parser->get() != last_script->get()) {
+			memdelete(last_parser->get());
+		}
+		parse_results[p_path] = parser;
+	}
+
+	publish_diagnostics(p_path);
+
+	return err;
+}
+
+String GDScriptWorkspace::get_file_path(const String &p_uri) const {
+	String path = p_uri.replace("file://", "").http_unescape();
+	path = path.replace(root + "/", "res://");
+	return ProjectSettings::get_singleton()->localize_path(path);
+}
+
+String GDScriptWorkspace::get_file_uri(const String &p_path) const {
+	String path = ProjectSettings::get_singleton()->globalize_path(p_path);
+	return "file://" + path;
+}
+
+void GDScriptWorkspace::publish_diagnostics(const String &p_path) {
+	Dictionary params;
+	Array errors;
+	const Map<String, ExtendGDScriptParser *>::Element *ele = parse_results.find(p_path);
+	if (ele) {
+		const Vector<lsp::Diagnostic> &list = ele->get()->get_diagnostics();
+		errors.resize(list.size());
+		for (int i = 0; i < list.size(); ++i) {
+			errors[i] = list[i].to_json();
+		}
+	}
+	params["diagnostics"] = errors;
+	params["uri"] = get_file_uri(p_path);
+	GDScriptLanguageProtocol::get_singleton()->notify_client("textDocument/publishDiagnostics", params);
+}
+
+void GDScriptWorkspace::completion(const lsp::CompletionParams &p_params, List<ScriptCodeCompletionOption> *r_options) {
+	String path = get_file_path(p_params.textDocument.uri);
+	String call_hint;
+	bool forced = false;
+	if (Map<String, ExtendGDScriptParser *>::Element *E = parse_results.find(path)) {
+		String code = E->get()->get_text_for_completion(p_params.position);
+		GDScriptLanguage::get_singleton()->complete_code(code, path, NULL, r_options, forced, call_hint);
+	}
+}
+
+GDScriptWorkspace::GDScriptWorkspace() {
+	ProjectSettings::get_singleton()->get_resource_path();
+}
+
+GDScriptWorkspace::~GDScriptWorkspace() {
+	Set<String> cached_parsers;
+	for (Map<String, ExtendGDScriptParser *>::Element *E = parse_results.front(); E; E = E->next()) {
+		cached_parsers.insert(E->key());
+	}
+	for (Map<String, ExtendGDScriptParser *>::Element *E = scripts.front(); E; E = E->next()) {
+		cached_parsers.insert(E->key());
+	}
+	for (Set<String>::Element *E = cached_parsers.front(); E; E = E->next()) {
+		remove_cache_parser(E->get());
+	}
+}
diff --git a/modules/gdscript/language_server/gdscript_workspace.h b/modules/gdscript/language_server/gdscript_workspace.h
new file mode 100644
index 0000000000..02ddc7cd71
--- /dev/null
+++ b/modules/gdscript/language_server/gdscript_workspace.h
@@ -0,0 +1,65 @@
+/*************************************************************************/
+/*  gdscript_workspace.h                                                 */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GDSCRIPT_WORKSPACE_H
+#define GDSCRIPT_WORKSPACE_H
+
+#include "../gdscript_parser.h"
+#include "core/variant.h"
+#include "gdscript_extend_parser.h"
+#include "lsp.hpp"
+
+class GDScriptWorkspace : public Reference {
+	GDCLASS(GDScriptWorkspace, Reference);
+
+protected:
+	static void _bind_methods();
+	void remove_cache_parser(const String &p_path);
+
+public:
+	String root;
+	Map<String, ExtendGDScriptParser *> scripts;
+	Map<String, ExtendGDScriptParser *> parse_results;
+
+public:
+	Array symbol(const Dictionary &p_params);
+
+public:
+	Error parse_script(const String &p_path, const String &p_content);
+	String get_file_path(const String &p_uri) const;
+	String get_file_uri(const String &p_path) const;
+	void publish_diagnostics(const String &p_path);
+	void completion(const lsp::CompletionParams &p_params, List<ScriptCodeCompletionOption> *r_options);
+
+	GDScriptWorkspace();
+	~GDScriptWorkspace();
+};
+
+#endif
diff --git a/modules/gdscript/language_server/lsp.hpp b/modules/gdscript/language_server/lsp.hpp
new file mode 100644
index 0000000000..81fa4c6181
--- /dev/null
+++ b/modules/gdscript/language_server/lsp.hpp
@@ -0,0 +1,1309 @@
+/*************************************************************************/
+/*  lsp.hpp                                                              */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GODOT_LSP_H
+#define GODOT_LSP_H
+
+#include "core/variant.h"
+
+namespace lsp {
+
+typedef String DocumentUri;
+
+/**
+ * Text documents are identified using a URI. On the protocol level, URIs are passed as strings.
+ */
+struct TextDocumentIdentifier {
+	/**
+	 * The text document's URI.
+	 */
+	DocumentUri uri;
+
+	void load(const Dictionary &p_params) {
+		uri = p_params["uri"];
+	}
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["uri"] = uri;
+		return dict;
+	}
+};
+
+/**
+ * Position in a text document expressed as zero-based line and zero-based character offset.
+ * A position is between two characters like an ‘insert’ cursor in a editor.
+ * Special values like for example -1 to denote the end of a line are not supported.
+ */
+struct Position {
+	/**
+	 * Line position in a document (zero-based).
+	 */
+	int line = 0;
+
+	/**
+	 * Character offset on a line in a document (zero-based). Assuming that the line is
+	 * represented as a string, the `character` value represents the gap between the
+	 * `character` and `character + 1`.
+	 *
+	 * If the character value is greater than the line length it defaults back to the
+	 * line length.
+	 */
+	int character = 0;
+
+	void load(const Dictionary &p_params) {
+		line = p_params["line"];
+		character = p_params["character"];
+	}
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["line"] = line;
+		dict["character"] = character;
+		return dict;
+	}
+};
+
+/**
+ * A range in a text document expressed as (zero-based) start and end positions.
+ * A range is comparable to a selection in an editor. Therefore the end position is exclusive.
+ * If you want to specify a range that contains a line including the line ending character(s) then use an end position denoting the start of the next line.
+ */
+struct Range {
+	/**
+	 * The range's start position.
+	 */
+	Position start;
+
+	/**
+	 * The range's end position.
+	 */
+	Position end;
+
+	void load(const Dictionary &p_params) {
+		start.load(p_params["start"]);
+		end.load(p_params["end"]);
+	}
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["start"] = start.to_json();
+		dict["end"] = end.to_json();
+		return dict;
+	}
+};
+
+/**
+ * Represents a location inside a resource, such as a line inside a text file.
+ */
+struct Location {
+	DocumentUri uri;
+	Range range;
+
+	void load(const Dictionary &p_params) {
+		uri = p_params["uri"];
+		range.load(p_params["range"]);
+	}
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["uri"] = uri;
+		dict["range"] = range.to_json();
+		return dict;
+	}
+};
+
+/**
+ * Represents a link between a source and a target location.
+ */
+struct LocationLink {
+
+	/**
+	 * Span of the origin of this link.
+	 *
+	 * Used as the underlined span for mouse interaction. Defaults to the word range at
+	 * the mouse position.
+	 */
+	Range *originSelectionRange = NULL;
+
+	/**
+	 * The target resource identifier of this link.
+	 */
+	String targetUri;
+
+	/**
+	 * The full target range of this link. If the target for example is a symbol then target range is the
+	 * range enclosing this symbol not including leading/trailing whitespace but everything else
+	 * like comments. This information is typically used to highlight the range in the editor.
+	 */
+	Range targetRange;
+
+	/**
+	 * The range that should be selected and revealed when this link is being followed, e.g the name of a function.
+	 * Must be contained by the the `targetRange`. See also `DocumentSymbol#range`
+	 */
+	Range targetSelectionRange;
+};
+
+/**
+ * A parameter literal used in requests to pass a text document and a position inside that document.
+ */
+struct TextDocumentPositionParams {
+	/**
+	 * The text document.
+	 */
+	TextDocumentIdentifier textDocument;
+
+	/**
+	 * The position inside the text document.
+	 */
+	Position position;
+
+	void load(const Dictionary &p_params) {
+		textDocument.load(p_params["textDocument"]);
+		position.load(p_params["position"]);
+	}
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["textDocument"] = textDocument.to_json();
+		dict["position"] = position.to_json();
+		return dict;
+	}
+};
+
+namespace TextDocumentSyncKind {
+/**
+	 * Documents should not be synced at all.
+	 */
+static const int None = 0;
+
+/**
+	 * Documents are synced by always sending the full content
+	 * of the document.
+	 */
+static const int Full = 1;
+
+/**
+	 * Documents are synced by sending the full content on open.
+	 * After that only incremental updates to the document are
+	 * send.
+	 */
+static const int Incremental = 2;
+}; // namespace TextDocumentSyncKind
+
+/**
+ * Completion options.
+ */
+struct CompletionOptions {
+	/**
+	 * The server provides support to resolve additional
+	 * information for a completion item.
+	 */
+	bool resolveProvider = true;
+
+	/**
+	 * The characters that trigger completion automatically.
+	 */
+	Vector<String> triggerCharacters;
+
+	CompletionOptions() {
+		triggerCharacters.push_back(".");
+		triggerCharacters.push_back("$");
+		triggerCharacters.push_back("'");
+		triggerCharacters.push_back("\"");
+		triggerCharacters.push_back("(");
+		triggerCharacters.push_back(",");
+	}
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["resolveProvider"] = resolveProvider;
+		dict["triggerCharacters"] = triggerCharacters;
+		return dict;
+	}
+};
+
+/**
+ * Signature help options.
+ */
+struct SignatureHelpOptions {
+	/**
+	 * The characters that trigger signature help
+	 * automatically.
+	 */
+	Vector<String> triggerCharacters;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["triggerCharacters"] = triggerCharacters;
+		return dict;
+	}
+};
+
+/**
+ * Code Lens options.
+ */
+struct CodeLensOptions {
+	/**
+	 * Code lens has a resolve provider as well.
+	 */
+	bool resolveProvider = false;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["resolveProvider"] = resolveProvider;
+		return dict;
+	}
+};
+
+/**
+ * Rename options
+ */
+struct RenameOptions {
+	/**
+	 * Renames should be checked and tested before being executed.
+	 */
+	bool prepareProvider = false;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["prepareProvider"] = prepareProvider;
+		return dict;
+	}
+};
+
+/**
+ * Document link options.
+ */
+struct DocumentLinkOptions {
+	/**
+	 * Document links have a resolve provider as well.
+	 */
+	bool resolveProvider = false;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["resolveProvider"] = resolveProvider;
+		return dict;
+	}
+};
+
+/**
+ * Execute command options.
+ */
+struct ExecuteCommandOptions {
+	/**
+	 * The commands to be executed on the server
+	 */
+	Vector<String> commands;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["commands"] = commands;
+		return dict;
+	}
+};
+
+/**
+ * Save options.
+ */
+struct SaveOptions {
+	/**
+	 * The client is supposed to include the content on save.
+	 */
+	bool includeText = true;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["includeText"] = includeText;
+		return dict;
+	}
+};
+
+/**
+ * Color provider options.
+ */
+struct ColorProviderOptions {
+	Dictionary to_json() {
+		Dictionary dict;
+		return dict;
+	}
+};
+
+/**
+ * Folding range provider options.
+ */
+struct FoldingRangeProviderOptions {
+	Dictionary to_json() {
+		Dictionary dict;
+		return dict;
+	}
+};
+
+struct TextDocumentSyncOptions {
+	/**
+	 * Open and close notifications are sent to the server. If omitted open close notification should not
+	 * be sent.
+	 */
+	bool openClose = true;
+
+	/**
+	 * Change notifications are sent to the server. See TextDocumentSyncKind.None, TextDocumentSyncKind.Full
+	 * and TextDocumentSyncKind.Incremental. If omitted it defaults to TextDocumentSyncKind.None.
+	 */
+	int change = TextDocumentSyncKind::Full;
+
+	/**
+	 * If present will save notifications are sent to the server. If omitted the notification should not be
+	 * sent.
+	 */
+	bool willSave = false;
+
+	/**
+	 * If present will save wait until requests are sent to the server. If omitted the request should not be
+	 * sent.
+	 */
+	bool willSaveWaitUntil = false;
+
+	/**
+	 * If present save notifications are sent to the server. If omitted the notification should not be
+	 * sent.
+	 */
+	SaveOptions save;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["willSaveWaitUntil"] = willSaveWaitUntil;
+		dict["willSave"] = willSave;
+		dict["openClose"] = openClose;
+		dict["change"] = change;
+		dict["change"] = save.to_json();
+		return dict;
+	}
+};
+
+/**
+ * Static registration options to be returned in the initialize request.
+ */
+struct StaticRegistrationOptions {
+	/**
+	 * The id used to register the request. The id can be used to deregister
+	 * the request again. See also Registration#id.
+	 */
+	String id;
+};
+
+/**
+ * Format document on type options.
+ */
+struct DocumentOnTypeFormattingOptions {
+	/**
+	 * A character on which formatting should be triggered, like `}`.
+	 */
+	String firstTriggerCharacter;
+
+	/**
+	 * More trigger characters.
+	 */
+	Vector<String> moreTriggerCharacter;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["firstTriggerCharacter"] = firstTriggerCharacter;
+		dict["moreTriggerCharacter"] = moreTriggerCharacter;
+		return dict;
+	}
+};
+
+struct TextDocumentItem {
+	/**
+	 * The text document's URI.
+	 */
+	DocumentUri uri;
+
+	/**
+	 * The text document's language identifier.
+	 */
+	String languageId;
+
+	/**
+	 * The version number of this document (it will increase after each
+	 * change, including undo/redo).
+	 */
+	int version;
+
+	/**
+	 * The content of the opened text document.
+	 */
+	String text;
+
+	void load(const Dictionary &p_dict) {
+		uri = p_dict["uri"];
+		languageId = p_dict["languageId"];
+		version = p_dict["version"];
+		text = p_dict["text"];
+	}
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["uri"] = uri;
+		dict["languageId"] = languageId;
+		dict["version"] = version;
+		dict["text"] = text;
+		return dict;
+	}
+};
+
+/**
+ * An event describing a change to a text document. If range and rangeLength are omitted
+ * the new text is considered to be the full content of the document.
+ */
+struct TextDocumentContentChangeEvent {
+	/**
+	 * The range of the document that changed.
+	 */
+	Range range;
+
+	/**
+	 * The length of the range that got replaced.
+	 */
+	int rangeLength;
+
+	/**
+	 * The new text of the range/document.
+	 */
+	String text;
+
+	void load(const Dictionary &p_params) {
+		text = p_params["text"];
+		rangeLength = p_params["rangeLength"];
+		range.load(p_params["range"]);
+	}
+};
+
+namespace DiagnosticSeverity {
+/**
+	 * Reports an error.
+	 */
+static const int Error = 1;
+/**
+	 * Reports a warning.
+	 */
+static const int Warning = 2;
+/**
+	 * Reports an information.
+	 */
+static const int Information = 3;
+/**
+	 * Reports a hint.
+	 */
+static const int Hint = 4;
+}; // namespace DiagnosticSeverity
+
+/**
+ * Represents a related message and source code location for a diagnostic. This should be
+ * used to point to code locations that cause or related to a diagnostics, e.g when duplicating
+ * a symbol in a scope.
+ */
+struct DiagnosticRelatedInformation {
+	/**
+	 * The location of this related diagnostic information.
+	 */
+	Location location;
+
+	/**
+	 * The message of this related diagnostic information.
+	 */
+	String message;
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["location"] = location.to_json(),
+		dict["message"] = message;
+		return dict;
+	}
+};
+
+/**
+ * Represents a diagnostic, such as a compiler error or warning.
+ * Diagnostic objects are only valid in the scope of a resource.
+ */
+struct Diagnostic {
+	/**
+	 * The range at which the message applies.
+	 */
+	Range range;
+
+	/**
+	 * The diagnostic's severity. Can be omitted. If omitted it is up to the
+	 * client to interpret diagnostics as error, warning, info or hint.
+	 */
+	int severity;
+
+	/**
+	 * The diagnostic's code, which might appear in the user interface.
+	 */
+	int code;
+
+	/**
+	 * A human-readable string describing the source of this
+	 * diagnostic, e.g. 'typescript' or 'super lint'.
+	 */
+	String source;
+
+	/**
+	 * The diagnostic's message.
+	 */
+	String message;
+
+	/**
+	 * An array of related diagnostic information, e.g. when symbol-names within
+	 * a scope collide all definitions can be marked via this property.
+	 */
+	Vector<DiagnosticRelatedInformation> relatedInformation;
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["range"] = range.to_json();
+		dict["code"] = code;
+		dict["severity"] = severity;
+		dict["message"] = message;
+		dict["source"] = source;
+		if (!relatedInformation.empty()) {
+			Array arr;
+			arr.resize(relatedInformation.size());
+			for (int i = 0; i < relatedInformation.size(); i++) {
+				arr[i] = relatedInformation[i].to_json();
+			}
+			dict["relatedInformation"] = arr;
+		}
+		return dict;
+	}
+};
+
+/**
+ * A symbol kind.
+ */
+namespace SymbolKind {
+static const int File = 1;
+static const int Module = 2;
+static const int Namespace = 3;
+static const int Package = 4;
+static const int Class = 5;
+static const int Method = 6;
+static const int Property = 7;
+static const int Field = 8;
+static const int Constructor = 9;
+static const int Enum = 10;
+static const int Interface = 11;
+static const int Function = 12;
+static const int Variable = 13;
+static const int Constant = 14;
+static const int String = 15;
+static const int Number = 16;
+static const int Boolean = 17;
+static const int Array = 18;
+static const int Object = 19;
+static const int Key = 20;
+static const int Null = 21;
+static const int EnumMember = 22;
+static const int Struct = 23;
+static const int Event = 24;
+static const int Operator = 25;
+static const int TypeParameter = 26;
+}; // namespace SymbolKind
+
+/**
+ * Represents information about programming constructs like variables, classes,
+ * interfaces etc.
+ */
+struct SymbolInformation {
+	/**
+	 * The name of this symbol.
+	 */
+	String name;
+
+	/**
+	 * The kind of this symbol.
+	 */
+	int kind = SymbolKind::File;
+
+	/**
+	 * Indicates if this symbol is deprecated.
+	 */
+	bool deprecated = false;
+
+	/**
+	 * The location of this symbol. The location's range is used by a tool
+	 * to reveal the location in the editor. If the symbol is selected in the
+	 * tool the range's start information is used to position the cursor. So
+	 * the range usually spans more then the actual symbol's name and does
+	 * normally include things like visibility modifiers.
+	 *
+	 * The range doesn't have to denote a node range in the sense of a abstract
+	 * syntax tree. It can therefore not be used to re-construct a hierarchy of
+	 * the symbols.
+	 */
+	Location location;
+
+	/**
+	 * The name of the symbol containing this symbol. This information is for
+	 * user interface purposes (e.g. to render a qualifier in the user interface
+	 * if necessary). It can't be used to re-infer a hierarchy for the document
+	 * symbols.
+	 */
+	String containerName;
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["name"] = name;
+		dict["kind"] = kind;
+		dict["deprecated"] = deprecated;
+		dict["location"] = location.to_json();
+		dict["containerName"] = containerName;
+		return dict;
+	}
+};
+
+/**
+ * Represents programming constructs like variables, classes, interfaces etc. that appear in a document. Document symbols can be
+ * hierarchical and they have two ranges: one that encloses its definition and one that points to its most interesting range,
+ * e.g. the range of an identifier.
+ */
+struct DocumentSymbol {
+
+	/**
+	 * The name of this symbol. Will be displayed in the user interface and therefore must not be
+	 * an empty string or a string only consisting of white spaces.
+	 */
+	String name;
+
+	/**
+	 * More detail for this symbol, e.g the signature of a function.
+	 */
+	String detail;
+
+	/**
+	 * The kind of this symbol.
+	 */
+	int kind = SymbolKind::File;
+
+	/**
+	 * Indicates if this symbol is deprecated.
+	 */
+	bool deprecated = false;
+
+	/**
+	 * The range enclosing this symbol not including leading/trailing whitespace but everything else
+	 * like comments. This information is typically used to determine if the clients cursor is
+	 * inside the symbol to reveal in the symbol in the UI.
+	 */
+	Range range;
+
+	/**
+	 * The range that should be selected and revealed when this symbol is being picked, e.g the name of a function.
+	 * Must be contained by the `range`.
+	 */
+	Range selectionRange;
+
+	/**
+	 * Children of this symbol, e.g. properties of a class.
+	 */
+	Vector<DocumentSymbol> children;
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["name"] = name;
+		dict["detail"] = detail;
+		dict["kind"] = kind;
+		dict["deprecated"] = deprecated;
+		dict["range"] = range.to_json();
+		dict["selectionRange"] = selectionRange.to_json();
+		Array arr;
+		arr.resize(children.size());
+		for (int i = 0; i < children.size(); i++) {
+			arr[i] = children[i].to_json();
+		}
+		dict["children"] = arr;
+		return dict;
+	}
+
+	void symbol_tree_as_list(const String &p_uri, Vector<SymbolInformation> &r_list, const String &p_container = "") const {
+		SymbolInformation si;
+		si.name = name;
+		si.kind = kind;
+		si.containerName = p_container;
+		si.deprecated = deprecated;
+		si.location.uri = p_uri;
+		si.location.range = range;
+		r_list.push_back(si);
+		for (int i = 0; i < children.size(); i++) {
+			children[i].symbol_tree_as_list(p_uri, r_list, name);
+		}
+	}
+};
+
+/**
+ * A textual edit applicable to a text document.
+ */
+struct TextEdit {
+	/**
+	 * The range of the text document to be manipulated. To insert
+	 * text into a document create a range where start === end.
+	 */
+	Range range;
+
+	/**
+	 * The string to be inserted. For delete operations use an
+	 * empty string.
+	 */
+	String newText;
+};
+
+/**
+ * Represents a reference to a command.
+ * Provides a title which will be used to represent a command in the UI.
+ * Commands are identified by a string identifier.
+ * The recommended way to handle commands is to implement their execution on the server side if the client and server provides the corresponding capabilities.
+ * Alternatively the tool extension code could handle the command. The protocol currently doesn’t specify a set of well-known commands.
+ */
+struct Command {
+	/**
+	 * Title of the command, like `save`.
+	 */
+	String title;
+	/**
+	 * The identifier of the actual command handler.
+	 */
+	String command;
+	/**
+	 * Arguments that the command handler should be
+	 * invoked with.
+	 */
+	Array arguments;
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["title"] = title;
+		dict["command"] = command;
+		if (arguments.size()) dict["arguments"] = arguments;
+		return dict;
+	}
+};
+
+/**
+ * The kind of a completion entry.
+ */
+namespace CompletionItemKind {
+static const int Text = 1;
+static const int Method = 2;
+static const int Function = 3;
+static const int Constructor = 4;
+static const int Field = 5;
+static const int Variable = 6;
+static const int Class = 7;
+static const int Interface = 8;
+static const int Module = 9;
+static const int Property = 10;
+static const int Unit = 11;
+static const int Value = 12;
+static const int Enum = 13;
+static const int Keyword = 14;
+static const int Snippet = 15;
+static const int Color = 16;
+static const int File = 17;
+static const int Reference = 18;
+static const int Folder = 19;
+static const int EnumMember = 20;
+static const int Constant = 21;
+static const int Struct = 22;
+static const int Event = 23;
+static const int Operator = 24;
+static const int TypeParameter = 25;
+}; // namespace CompletionItemKind
+
+/**
+ * Defines whether the insert text in a completion item should be interpreted as
+ * plain text or a snippet.
+ */
+namespace InsertTextFormat {
+/**
+	 * The primary text to be inserted is treated as a plain string.
+	 */
+static const int PlainText = 1;
+
+/**
+	 * The primary text to be inserted is treated as a snippet.
+	 *
+	 * A snippet can define tab stops and placeholders with `$1`, `$2`
+	 * and `${3:foo}`. `$0` defines the final tab stop, it defaults to
+	 * the end of the snippet. Placeholders with equal identifiers are linked,
+	 * that is typing in one will update others too.
+	 */
+static const int Snippet = 2;
+}; // namespace InsertTextFormat
+
+struct CompletionItem {
+	/**
+	 * The label of this completion item. By default
+	 * also the text that is inserted when selecting
+	 * this completion.
+	 */
+	String label;
+
+	/**
+	 * The kind of this completion item. Based of the kind
+	 * an icon is chosen by the editor. The standardized set
+	 * of available values is defined in `CompletionItemKind`.
+	 */
+	int kind;
+
+	/**
+	 * A human-readable string with additional information
+	 * about this item, like type or symbol information.
+	 */
+	String detail;
+
+	/**
+	 * A human-readable string that represents a doc-comment.
+	 */
+	String documentation;
+
+	/**
+	 * Indicates if this item is deprecated.
+	 */
+	bool deprecated = false;
+
+	/**
+	 * Select this item when showing.
+	 *
+	 * *Note* that only one completion item can be selected and that the
+	 * tool / client decides which item that is. The rule is that the *first*
+	 * item of those that match best is selected.
+	 */
+	bool preselect = false;
+
+	/**
+	 * A string that should be used when comparing this item
+	 * with other items. When `falsy` the label is used.
+	 */
+	String sortText;
+
+	/**
+	 * A string that should be used when filtering a set of
+	 * completion items. When `falsy` the label is used.
+	 */
+	String filterText;
+
+	/**
+	 * A string that should be inserted into a document when selecting
+	 * this completion. When `falsy` the label is used.
+	 *
+	 * The `insertText` is subject to interpretation by the client side.
+	 * Some tools might not take the string literally. For example
+	 * VS Code when code complete is requested in this example `con<cursor position>`
+	 * and a completion item with an `insertText` of `console` is provided it
+	 * will only insert `sole`. Therefore it is recommended to use `textEdit` instead
+	 * since it avoids additional client side interpretation.
+	 *
+	 * @deprecated Use textEdit instead.
+	 */
+	String insertText;
+
+	/**
+	 * The format of the insert text. The format applies to both the `insertText` property
+	 * and the `newText` property of a provided `textEdit`.
+	 */
+	int insertTextFormat;
+
+	/**
+	 * An edit which is applied to a document when selecting this completion. When an edit is provided the value of
+	 * `insertText` is ignored.
+	 *
+	 * *Note:* The range of the edit must be a single line range and it must contain the position at which completion
+	 * has been requested.
+	 */
+	TextEdit textEdit;
+
+	/**
+	 * An optional array of additional text edits that are applied when
+	 * selecting this completion. Edits must not overlap (including the same insert position)
+	 * with the main edit nor with themselves.
+	 *
+	 * Additional text edits should be used to change text unrelated to the current cursor position
+	 * (for example adding an import statement at the top of the file if the completion item will
+	 * insert an unqualified type).
+	 */
+	Vector<TextEdit> additionalTextEdits;
+
+	/**
+	 * An optional set of characters that when pressed while this completion is active will accept it first and
+	 * then type that character. *Note* that all commit characters should have `length=1` and that superfluous
+	 * characters will be ignored.
+	 */
+	Vector<String> commitCharacters;
+
+	/**
+	 * An optional command that is executed *after* inserting this completion. *Note* that
+	 * additional modifications to the current document should be described with the
+	 * additionalTextEdits-property.
+	 */
+	Command command;
+
+	/**
+	 * A data entry field that is preserved on a completion item between
+	 * a completion and a completion resolve request.
+	 */
+	Variant data;
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["label"] = label;
+		dict["kind"] = kind;
+		dict["kind"] = kind;
+		dict["detail"] = detail;
+		dict["documentation"] = documentation;
+		dict["deprecated"] = deprecated;
+		dict["preselect"] = preselect;
+		dict["sortText"] = sortText;
+		dict["filterText"] = filterText;
+		dict["insertText"] = insertText;
+		if (commitCharacters.size()) dict["commitCharacters"] = commitCharacters;
+		dict["command"] = command.to_json();
+		dict["data"] = data;
+		return dict;
+	}
+};
+
+/**
+ * Represents a collection of [completion items](#CompletionItem) to be presented
+ * in the editor.
+ */
+struct CompletionList {
+	/**
+	 * This list it not complete. Further typing should result in recomputing
+	 * this list.
+	 */
+	bool isIncomplete;
+
+	/**
+	 * The completion items.
+	 */
+	Vector<CompletionItem> items;
+};
+
+/**
+ * Enum of known range kinds
+ */
+namespace FoldingRangeKind {
+/**
+	 * Folding range for a comment
+	 */
+static const String Comment = "comment";
+/**
+	 * Folding range for a imports or includes
+	 */
+static const String Imports = "imports";
+/**
+	 * Folding range for a region (e.g. `#region`)
+	 */
+static const String Region = "region";
+} // namespace FoldingRangeKind
+
+/**
+ * Represents a folding range.
+ */
+struct FoldingRange {
+
+	/**
+	 * The zero-based line number from where the folded range starts.
+	 */
+	int startLine = 0;
+
+	/**
+	 * The zero-based character offset from where the folded range starts. If not defined, defaults to the length of the start line.
+	 */
+	int startCharacter = 0;
+
+	/**
+	 * The zero-based line number where the folded range ends.
+	 */
+	int endLine = 0;
+
+	/**
+	 * The zero-based character offset before the folded range ends. If not defined, defaults to the length of the end line.
+	 */
+	int endCharacter = 0;
+
+	/**
+	 * Describes the kind of the folding range such as `comment' or 'region'. The kind
+	 * is used to categorize folding ranges and used by commands like 'Fold all comments'. See
+	 * [FoldingRangeKind](#FoldingRangeKind) for an enumeration of standardized kinds.
+	 */
+	String kind = FoldingRangeKind::Region;
+
+	Dictionary to_json() const {
+		Dictionary dict;
+		dict["startLine"] = startLine;
+		dict["startCharacter"] = startCharacter;
+		dict["endLine"] = endLine;
+		dict["endCharacter"] = endCharacter;
+		return dict;
+	}
+};
+
+/**
+ * How a completion was triggered
+ */
+namespace CompletionTriggerKind {
+/**
+	 * Completion was triggered by typing an identifier (24x7 code
+	 * complete), manual invocation (e.g Ctrl+Space) or via API.
+	 */
+static const int Invoked = 1;
+
+/**
+	 * Completion was triggered by a trigger character specified by
+	 * the `triggerCharacters` properties of the `CompletionRegistrationOptions`.
+	 */
+static const int TriggerCharacter = 2;
+
+/**
+	 * Completion was re-triggered as the current completion list is incomplete.
+	 */
+static const int TriggerForIncompleteCompletions = 3;
+} // namespace CompletionTriggerKind
+
+/**
+ * Contains additional information about the context in which a completion request is triggered.
+ */
+struct CompletionContext {
+	/**
+	* How the completion was triggered.
+	*/
+	int triggerKind = CompletionTriggerKind::TriggerCharacter;
+
+	/**
+	 * The trigger character (a single character) that has trigger code complete.
+	 * Is undefined if `triggerKind !== CompletionTriggerKind.TriggerCharacter`
+	 */
+	String triggerCharacter;
+
+	void load(const Dictionary &p_params) {
+		triggerKind = int(p_params["triggerKind"]);
+		triggerCharacter = p_params["triggerCharacter"];
+	}
+};
+
+struct CompletionParams : public TextDocumentPositionParams {
+
+	/**
+	 * The completion context. This is only available if the client specifies
+	 * to send this using `ClientCapabilities.textDocument.completion.contextSupport === true`
+	 */
+	CompletionContext context;
+
+	void load(const Dictionary &p_params) {
+		TextDocumentPositionParams::load(p_params);
+		context.load(p_params["context"]);
+	}
+};
+
+struct ServerCapabilities {
+	/**
+	 * Defines how text documents are synced. Is either a detailed structure defining each notification or
+	 * for backwards compatibility the TextDocumentSyncKind number. If omitted it defaults to `TextDocumentSyncKind.None`.
+	 */
+	TextDocumentSyncOptions textDocumentSync;
+
+	/**
+	 * The server provides hover support.
+	 */
+	bool hoverProvider = true;
+
+	/**
+	 * The server provides completion support.
+	 */
+	CompletionOptions completionProvider;
+
+	/**
+	 * The server provides signature help support.
+	 */
+	SignatureHelpOptions signatureHelpProvider;
+
+	/**
+	 * The server provides goto definition support.
+	 */
+	bool definitionProvider = false;
+
+	/**
+	 * The server provides Goto Type Definition support.
+	 *
+	 * Since 3.6.0
+	 */
+	bool typeDefinitionProvider = false;
+
+	/**
+	 * The server provides Goto Implementation support.
+	 *
+	 * Since 3.6.0
+	 */
+	bool implementationProvider = false;
+
+	/**
+	 * The server provides find references support.
+	 */
+	bool referencesProvider = false;
+
+	/**
+	 * The server provides document highlight support.
+	 */
+	bool documentHighlightProvider = false;
+
+	/**
+	 * The server provides document symbol support.
+	 */
+	bool documentSymbolProvider = true;
+
+	/**
+	 * The server provides workspace symbol support.
+	 */
+	bool workspaceSymbolProvider = true;
+
+	/**
+	 * The server provides code actions. The `CodeActionOptions` return type is only
+	 * valid if the client signals code action literal support via the property
+	 * `textDocument.codeAction.codeActionLiteralSupport`.
+	 */
+	bool codeActionProvider = false;
+
+	/**
+	 * The server provides code lens.
+	 */
+	CodeLensOptions codeLensProvider;
+
+	/**
+	 * The server provides document formatting.
+	 */
+	bool documentFormattingProvider = false;
+
+	/**
+	 * The server provides document range formatting.
+	 */
+	bool documentRangeFormattingProvider = false;
+
+	/**
+	 * The server provides document formatting on typing.
+	 */
+	DocumentOnTypeFormattingOptions documentOnTypeFormattingProvider;
+
+	/**
+	 * The server provides rename support. RenameOptions may only be
+	 * specified if the client states that it supports
+	 * `prepareSupport` in its initial `initialize` request.
+	 */
+	RenameOptions renameProvider;
+
+	/**
+	 * The server provides document link support.
+	 */
+	DocumentLinkOptions documentLinkProvider;
+
+	/**
+	 * The server provides color provider support.
+	 *
+	 * Since 3.6.0
+	 */
+	ColorProviderOptions colorProvider;
+
+	/**
+	 * The server provides folding provider support.
+	 *
+	 * Since 3.10.0
+	 */
+	FoldingRangeProviderOptions foldingRangeProvider;
+
+	/**
+	 * The server provides go to declaration support.
+	 *
+	 * Since 3.14.0
+	 */
+	bool declarationProvider = true;
+
+	/**
+	 * The server provides execute command support.
+	 */
+	ExecuteCommandOptions executeCommandProvider;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["textDocumentSync"] = (int)textDocumentSync.change;
+		dict["completionProvider"] = completionProvider.to_json();
+		dict["signatureHelpProvider"] = signatureHelpProvider.to_json();
+		dict["codeLensProvider"] = false; // codeLensProvider.to_json();
+		dict["documentOnTypeFormattingProvider"] = documentOnTypeFormattingProvider.to_json();
+		dict["renameProvider"] = renameProvider.to_json();
+		dict["documentLinkProvider"] = documentLinkProvider.to_json();
+		dict["colorProvider"] = false; // colorProvider.to_json();
+		dict["foldingRangeProvider"] = false; //foldingRangeProvider.to_json();
+		dict["executeCommandProvider"] = executeCommandProvider.to_json();
+		dict["hoverProvider"] = hoverProvider;
+		dict["definitionProvider"] = definitionProvider;
+		dict["typeDefinitionProvider"] = typeDefinitionProvider;
+		dict["implementationProvider"] = implementationProvider;
+		dict["referencesProvider"] = referencesProvider;
+		dict["documentHighlightProvider"] = documentHighlightProvider;
+		dict["documentSymbolProvider"] = documentSymbolProvider;
+		dict["workspaceSymbolProvider"] = workspaceSymbolProvider;
+		dict["codeActionProvider"] = codeActionProvider;
+		dict["documentFormattingProvider"] = documentFormattingProvider;
+		dict["documentRangeFormattingProvider"] = documentRangeFormattingProvider;
+		dict["declarationProvider"] = declarationProvider;
+		return dict;
+	}
+};
+
+struct InitializeResult {
+	/**
+	 * The capabilities the language server provides.
+	 */
+	ServerCapabilities capabilities;
+
+	Dictionary to_json() {
+		Dictionary dict;
+		dict["capabilities"] = capabilities.to_json();
+		return dict;
+	}
+};
+
+} // namespace lsp
+
+#endif
diff --git a/modules/gdscript/register_types.cpp b/modules/gdscript/register_types.cpp
index b8a13ed91b..edf877b9ac 100644
--- a/modules/gdscript/register_types.cpp
+++ b/modules/gdscript/register_types.cpp
@@ -36,6 +36,7 @@
 #include "editor/gdscript_highlighter.h"
 #include "gdscript.h"
 #include "gdscript_tokenizer.h"
+#include "language_server/gdscript_language_server.h"
 
 GDScriptLanguage *script_language_gd = NULL;
 Ref<ResourceFormatLoaderGDScript> resource_loader_gd;
@@ -130,6 +131,8 @@ static void _editor_init() {
 	Ref<EditorExportGDScript> gd_export;
 	gd_export.instance();
 	EditorExport::get_singleton()->add_export_plugin(gd_export);
+	EditorNode::get_singleton()->add_editor_plugin(memnew(GDScriptLanguageServer));
+	register_lsp_types();
 }
 
 #endif