Reintroduce code completion

9 files changed, 2903 insertions, 30 deletions

diff --git a/editor/code_editor.cpp b/editor/code_editor.cpp
index d8648310b6..9a87d6d38c 100644
--- a/editor/code_editor.cpp
+++ b/editor/code_editor.cpp
@@ -1778,6 +1778,7 @@ CodeTextEditor::CodeTextEditor() {
 	cs.push_back("(");
 	cs.push_back("=");
 	cs.push_back("$");
+	cs.push_back("@");
 	text_editor->set_completion(true, cs);
 	idle->connect("timeout", callable_mp(this, &CodeTextEditor::_text_changed_idle_timeout));
 
diff --git a/modules/gdscript/gdscript.cpp b/modules/gdscript/gdscript.cpp
index dffea329b4..0eade062c9 100644
--- a/modules/gdscript/gdscript.cpp
+++ b/modules/gdscript/gdscript.cpp
@@ -471,7 +471,7 @@ bool GDScript::_update_exports(bool *r_err, bool p_recursive_call) {
 
 						members_cache.push_back(member.variable->export_info);
 						Variant default_value;
-						if (member.variable->initializer->is_constant) {
+						if (member.variable->initializer && member.variable->initializer->is_constant) {
 							default_value = member.variable->initializer->reduced_value;
 						}
 						member_default_values_cache[member.variable->identifier->name] = default_value;
diff --git a/modules/gdscript/gdscript_analyzer.cpp b/modules/gdscript/gdscript_analyzer.cpp
index 5b19460b0d..7201490cee 100644
--- a/modules/gdscript/gdscript_analyzer.cpp
+++ b/modules/gdscript/gdscript_analyzer.cpp
@@ -1134,6 +1134,10 @@ void GDScriptAnalyzer::resolve_return(GDScriptParser::ReturnNode *p_return) {
 void GDScriptAnalyzer::reduce_expression(GDScriptParser::ExpressionNode *p_expression) {
 	// This one makes some magic happen.
 
+	if (p_expression == nullptr) {
+		return;
+	}
+
 	if (p_expression->reduced) {
 		// Don't do this more than once.
 		return;
@@ -1248,6 +1252,10 @@ void GDScriptAnalyzer::reduce_assignment(GDScriptParser::AssignmentNode *p_assig
 	reduce_expression(p_assignment->assignee);
 	reduce_expression(p_assignment->assigned_value);
 
+	if (p_assignment->assigned_value == nullptr || p_assignment->assignee == nullptr) {
+		return;
+	}
+
 	if (p_assignment->assignee->get_datatype().is_constant) {
 		push_error("Cannot assign a new value to a constant.", p_assignment->assignee);
 	}
@@ -2038,6 +2046,9 @@ void GDScriptAnalyzer::reduce_subscript(GDScriptParser::SubscriptNode *p_subscri
 
 	// Reduce index first. If it's a constant StringName, use attribute instead.
 	if (!p_subscript->is_attribute) {
+		if (p_subscript->index == nullptr) {
+			return;
+		}
 		reduce_expression(p_subscript->index);
 
 		if (p_subscript->index->is_constant && p_subscript->index->reduced_value.get_type() == Variant::STRING_NAME) {
@@ -2053,6 +2064,9 @@ void GDScriptAnalyzer::reduce_subscript(GDScriptParser::SubscriptNode *p_subscri
 	}
 
 	if (p_subscript->is_attribute) {
+		if (p_subscript->attribute == nullptr) {
+			return;
+		}
 		if (p_subscript->base->is_constant) {
 			// Just try to get it.
 			bool valid = false;
diff --git a/modules/gdscript/gdscript_compiler.cpp b/modules/gdscript/gdscript_compiler.cpp
index 80efc9519d..da19ce5000 100644
--- a/modules/gdscript/gdscript_compiler.cpp
+++ b/modules/gdscript/gdscript_compiler.cpp
@@ -165,10 +165,12 @@ GDScriptDataType GDScriptCompiler::_gdtype_from_datatype(const GDScriptParser::D
 			}
 
 		} break;
-		default: {
+		case GDScriptParser::DataType::UNRESOLVED: {
 			ERR_PRINT("Parser bug: converting unresolved type.");
 			return GDScriptDataType();
 		}
+		default:
+			break; // FIXME
 	}
 
 	return result;
@@ -1325,10 +1327,9 @@ int GDScriptCompiler::_parse_expression(CodeGen &codegen, const GDScriptParser::
 					return -1;
 				}
 
-				// FIXME: Actually check type.
-				GDScriptDataType assign_type; // = _gdtype_from_datatype(on->arguments[0]->get_datatype());
+				GDScriptDataType assign_type = _gdtype_from_datatype(assignment->assignee->get_datatype());
 
-				if (assign_type.has_type && !assignment->get_datatype().is_set()) {
+				if (assign_type.has_type && !assignment->assigned_value->get_datatype().is_variant()) {
 					// Typed assignment
 					switch (assign_type.kind) {
 						case GDScriptDataType::BUILTIN: {
diff --git a/modules/gdscript/gdscript_editor.cpp b/modules/gdscript/gdscript_editor.cpp
index 86ba16aaec..e1ca1c9f48 100644
--- a/modules/gdscript/gdscript_editor.cpp
+++ b/modules/gdscript/gdscript_editor.cpp
@@ -39,6 +39,7 @@
 #include "gdscript_tokenizer.h"
 
 #ifdef TOOLS_ENABLED
+#include "core/project_settings.h"
 #include "editor/editor_file_system.h"
 #include "editor/editor_settings.h"
 #endif
@@ -170,6 +171,15 @@ bool GDScriptLanguage::validate(const String &p_script, int &r_line_error, int &
 		}
 	}
 
+	if (r_safe_lines) {
+		const Set<int> &unsafe_lines = parser.get_unsafe_lines();
+		for (int i = 1; i <= parser.get_last_line_number(); i++) {
+			if (!unsafe_lines.has(i)) {
+				r_safe_lines->insert(i);
+			}
+		}
+	}
+
 	return true;
 }
 
@@ -469,11 +479,2192 @@ String GDScriptLanguage::make_function(const String &p_class, const String &p_na
 
 //////// COMPLETION //////////
 
-// FIXME: Readd completion
+#ifdef TOOLS_ENABLED
+
+struct GDScriptCompletionIdentifier {
+	GDScriptParser::DataType type;
+	String enumeration;
+	Variant value;
+	const GDScriptParser::ExpressionNode *assigned_expression = nullptr;
+};
+
+// TODO: Move this to a central location (maybe core?).
+static const char *underscore_classes[] = {
+	"ClassDB",
+	"Directory",
+	"Engine",
+	"File",
+	"Geometry",
+	"GodotSharp",
+	"JSON",
+	"Marshalls",
+	"Mutex",
+	"OS",
+	"ResourceLoader",
+	"ResourceSaver",
+	"Semaphore",
+	"Thread",
+	"VisualScriptEditor",
+	nullptr,
+};
+static StringName _get_real_class_name(const StringName &p_source) {
+	const char **class_name = underscore_classes;
+	while (*class_name != nullptr) {
+		if (p_source == *class_name) {
+			return String("_") + p_source;
+		}
+		class_name++;
+	}
+	return p_source;
+}
+
+static String _get_visual_datatype(const PropertyInfo &p_info, bool p_is_arg = true) {
+	if (p_info.usage & PROPERTY_USAGE_CLASS_IS_ENUM) {
+		String enum_name = p_info.class_name;
+		if (enum_name.find(".") == -1) {
+			return enum_name;
+		}
+		return enum_name.get_slice(".", 1);
+	}
+
+	String n = p_info.name;
+	int idx = n.find(":");
+	if (idx != -1) {
+		return n.substr(idx + 1, n.length());
+	}
+
+	if (p_info.type == Variant::OBJECT) {
+		if (p_info.hint == PROPERTY_HINT_RESOURCE_TYPE) {
+			return p_info.hint_string;
+		} else {
+			return p_info.class_name.operator String();
+		}
+	}
+	if (p_info.type == Variant::NIL) {
+		if (p_is_arg || (p_info.usage & PROPERTY_USAGE_NIL_IS_VARIANT)) {
+			return "Variant";
+		} else {
+			return "void";
+		}
+	}
+
+	return Variant::get_type_name(p_info.type);
+}
+
+static String _make_arguments_hint(const MethodInfo &p_info, int p_arg_idx, bool p_is_annotation = false) {
+	String arghint;
+	if (!p_is_annotation) {
+		arghint += _get_visual_datatype(p_info.return_val, false) + " ";
+	}
+	arghint += p_info.name + "(";
+
+	int def_args = p_info.arguments.size() - p_info.default_arguments.size();
+	int i = 0;
+	for (const List<PropertyInfo>::Element *E = p_info.arguments.front(); E; E = E->next()) {
+		if (i > 0) {
+			arghint += ", ";
+		}
+
+		if (i == p_arg_idx) {
+			arghint += String::chr(0xFFFF);
+		}
+		arghint += E->get().name + ": " + _get_visual_datatype(E->get(), true);
+
+		if (i - def_args >= 0) {
+			arghint += String(" = ") + p_info.default_arguments[i - def_args].get_construct_string();
+		}
+
+		if (i == p_arg_idx) {
+			arghint += String::chr(0xFFFF);
+		}
+
+		i++;
+	}
+
+	if (p_info.flags & METHOD_FLAG_VARARG) {
+		if (p_info.arguments.size() > 0) {
+			arghint += ", ";
+		}
+		if (p_arg_idx >= p_info.arguments.size()) {
+			arghint += String::chr(0xFFFF);
+		}
+		arghint += "...";
+		if (p_arg_idx >= p_info.arguments.size()) {
+			arghint += String::chr(0xFFFF);
+		}
+	}
+
+	arghint += ")";
+
+	return arghint;
+}
+
+static String _make_arguments_hint(const GDScriptParser::FunctionNode *p_function, int p_arg_idx) {
+	String arghint = p_function->get_datatype().to_string() + " " + p_function->identifier->name.operator String() + "(";
+
+	for (int i = 0; i < p_function->parameters.size(); i++) {
+		if (i > 0) {
+			arghint += ", ";
+		}
+
+		if (i == p_arg_idx) {
+			arghint += String::chr(0xFFFF);
+		}
+		const GDScriptParser::ParameterNode *par = p_function->parameters[i];
+		arghint += par->identifier->name.operator String() + ": " + par->get_datatype().to_string();
+
+		if (par->default_value) {
+			String def_val = "<unknown>";
+			if (par->default_value->type == GDScriptParser::Node::LITERAL) {
+				const GDScriptParser::LiteralNode *literal = static_cast<const GDScriptParser::LiteralNode *>(par->default_value);
+				def_val = literal->value.get_construct_string();
+			} else if (par->default_value->type == GDScriptParser::Node::IDENTIFIER) {
+				const GDScriptParser::IdentifierNode *id = static_cast<const GDScriptParser::IdentifierNode *>(par->default_value);
+				def_val = id->name.operator String();
+			}
+			arghint += " = " + def_val;
+		}
+		if (i == p_arg_idx) {
+			arghint += String::chr(0xFFFF);
+		}
+	}
+
+	arghint += ")";
+
+	return arghint;
+}
+
+static void _get_directory_contents(EditorFileSystemDirectory *p_dir, Map<String, ScriptCodeCompletionOption> &r_list) {
+	const String quote_style = EDITOR_DEF("text_editor/completion/use_single_quotes", false) ? "'" : "\"";
+
+	for (int i = 0; i < p_dir->get_file_count(); i++) {
+		ScriptCodeCompletionOption option(p_dir->get_file_path(i), ScriptCodeCompletionOption::KIND_FILE_PATH);
+		option.insert_text = quote_style + option.display + quote_style;
+		r_list.insert(option.display, option);
+	}
+
+	for (int i = 0; i < p_dir->get_subdir_count(); i++) {
+		_get_directory_contents(p_dir->get_subdir(i), r_list);
+	}
+}
+
+static void _find_annotation_arguments(const GDScriptParser::AnnotationNode *p_annotation, int p_argument, const String p_quote_style, Map<String, ScriptCodeCompletionOption> &r_result) {
+	if (p_annotation->name == "@export_range" || p_annotation->name == "@export_exp_range") {
+		if (p_argument == 3 || p_argument == 4) {
+			// Slider hint.
+			ScriptCodeCompletionOption slider1("or_greater", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			slider1.insert_text = p_quote_style + slider1.display + p_quote_style;
+			r_result.insert(slider1.display, slider1);
+			ScriptCodeCompletionOption slider2("or_lesser", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			slider2.insert_text = p_quote_style + slider2.display + p_quote_style;
+			r_result.insert(slider2.display, slider2);
+		}
+	} else if (p_annotation->name == "@export_exp_easing") {
+		if (p_argument == 0 || p_argument == 1) {
+			// Easing hint.
+			ScriptCodeCompletionOption hint1("attenuation", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			hint1.insert_text = p_quote_style + hint1.display + p_quote_style;
+			r_result.insert(hint1.display, hint1);
+			ScriptCodeCompletionOption hint2("inout", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			hint2.insert_text = p_quote_style + hint2.display + p_quote_style;
+			r_result.insert(hint2.display, hint2);
+		}
+	} else if (p_annotation->name == "@export_node_path") {
+		ScriptCodeCompletionOption node("Node", ScriptCodeCompletionOption::KIND_CLASS);
+		r_result.insert(node.display, node);
+		List<StringName> node_types;
+		ClassDB::get_inheriters_from_class("Node", &node_types);
+		for (const List<StringName>::Element *E = node_types.front(); E != nullptr; E = E->next()) {
+			if (!ClassDB::is_class_exposed(E->get())) {
+				continue;
+			}
+			ScriptCodeCompletionOption option(E->get(), ScriptCodeCompletionOption::KIND_CLASS);
+			r_result.insert(option.display, option);
+		}
+	}
+}
+
+static void _list_available_types(bool p_inherit_only, GDScriptParser::CompletionContext &p_context, Map<String, ScriptCodeCompletionOption> &r_result) {
+	List<StringName> native_types;
+	ClassDB::get_class_list(&native_types);
+	for (const List<StringName>::Element *E = native_types.front(); E != nullptr; E = E->next()) {
+		if (ClassDB::is_class_exposed(E->get()) && !Engine::get_singleton()->has_singleton(E->get())) {
+			ScriptCodeCompletionOption option(E->get(), ScriptCodeCompletionOption::KIND_CLASS);
+			r_result.insert(option.display, option);
+		}
+	}
+
+	if (p_context.current_class) {
+		if (!p_inherit_only && p_context.current_class->base_type.is_set()) {
+			// Native enums from base class
+			List<StringName> enums;
+			ClassDB::get_enum_list(p_context.current_class->base_type.native_type, &enums);
+			for (const List<StringName>::Element *E = enums.front(); E != nullptr; E = E->next()) {
+				ScriptCodeCompletionOption option(E->get(), ScriptCodeCompletionOption::KIND_ENUM);
+				r_result.insert(option.display, option);
+			}
+		}
+		// Check current class for potential types
+		const GDScriptParser::ClassNode *current = p_context.current_class;
+		while (current) {
+			for (int i = 0; i < current->members.size(); i++) {
+				const GDScriptParser::ClassNode::Member &member = current->members[i];
+				switch (member.type) {
+					case GDScriptParser::ClassNode::Member::CLASS: {
+						ScriptCodeCompletionOption option(member.m_class->identifier->name, ScriptCodeCompletionOption::KIND_CLASS);
+						r_result.insert(option.display, option);
+					} break;
+					case GDScriptParser::ClassNode::Member::ENUM: {
+						if (!p_inherit_only) {
+							ScriptCodeCompletionOption option(member.m_enum->identifier->name, ScriptCodeCompletionOption::KIND_ENUM);
+							r_result.insert(option.display, option);
+						}
+					} break;
+					case GDScriptParser::ClassNode::Member::CONSTANT: {
+						if (member.constant->get_datatype().is_meta_type && p_context.current_class->outer != nullptr) {
+							ScriptCodeCompletionOption option(member.constant->identifier->name, ScriptCodeCompletionOption::KIND_CLASS);
+							r_result.insert(option.display, option);
+						}
+					} break;
+					default:
+						break;
+				}
+			}
+			current = current->outer;
+		}
+	}
+
+	// Global scripts
+	List<StringName> global_classes;
+	ScriptServer::get_global_class_list(&global_classes);
+	for (const List<StringName>::Element *E = global_classes.front(); E != nullptr; E = E->next()) {
+		ScriptCodeCompletionOption option(E->get(), ScriptCodeCompletionOption::KIND_CLASS);
+		r_result.insert(option.display, option);
+	}
+
+	// Autoload singletons
+	Map<StringName, ProjectSettings::AutoloadInfo> autoloads = ProjectSettings::get_singleton()->get_autoload_list();
+	for (const Map<StringName, ProjectSettings::AutoloadInfo>::Element *E = autoloads.front(); E != nullptr; E = E->next()) {
+		const ProjectSettings::AutoloadInfo &info = E->get();
+		if (!info.is_singleton || info.path.get_extension().to_lower() != "gd") {
+			continue;
+		}
+		ScriptCodeCompletionOption option(info.name, ScriptCodeCompletionOption::KIND_CLASS);
+		r_result.insert(option.display, option);
+	}
+}
+
+static void _find_identifiers_in_suite(const GDScriptParser::SuiteNode *p_suite, Map<String, ScriptCodeCompletionOption> &r_result) {
+	for (int i = 0; i < p_suite->locals.size(); i++) {
+		ScriptCodeCompletionOption option(p_suite->locals[i].name, ScriptCodeCompletionOption::KIND_VARIABLE);
+		r_result.insert(option.display, option);
+	}
+	if (p_suite->parent_block) {
+		_find_identifiers_in_suite(p_suite->parent_block, r_result);
+	}
+}
+
+static void _find_identifiers_in_base(const GDScriptCompletionIdentifier &p_base, bool p_only_functions, Map<String, ScriptCodeCompletionOption> &r_result);
+
+static void _find_identifiers_in_class(const GDScriptParser::ClassNode *p_class, bool p_only_functions, bool p_static, bool p_parent_only, Map<String, ScriptCodeCompletionOption> &r_result) {
+	if (!p_parent_only) {
+		bool outer = false;
+		const GDScriptParser::ClassNode *clss = p_class;
+		while (clss) {
+			for (int i = 0; i < clss->members.size(); i++) {
+				const GDScriptParser::ClassNode::Member &member = clss->members[i];
+				ScriptCodeCompletionOption option;
+				switch (member.type) {
+					case GDScriptParser::ClassNode::Member::VARIABLE:
+						if (p_only_functions || outer || (p_static)) {
+							continue;
+						}
+						option = ScriptCodeCompletionOption(member.variable->identifier->name, ScriptCodeCompletionOption::KIND_MEMBER);
+						break;
+					case GDScriptParser::ClassNode::Member::CONSTANT:
+						if (p_only_functions) {
+							continue;
+						}
+						option = ScriptCodeCompletionOption(member.constant->identifier->name, ScriptCodeCompletionOption::KIND_CONSTANT);
+						break;
+					case GDScriptParser::ClassNode::Member::CLASS:
+						if (p_only_functions) {
+							continue;
+						}
+						option = ScriptCodeCompletionOption(member.m_class->identifier->name, ScriptCodeCompletionOption::KIND_CLASS);
+						break;
+					case GDScriptParser::ClassNode::Member::ENUM_VALUE:
+						if (p_only_functions) {
+							continue;
+						}
+						option = ScriptCodeCompletionOption(member.enum_value.identifier->name, ScriptCodeCompletionOption::KIND_CONSTANT);
+						break;
+					case GDScriptParser::ClassNode::Member::ENUM:
+						if (p_only_functions) {
+							continue;
+						}
+						option = ScriptCodeCompletionOption(member.m_enum->identifier->name, ScriptCodeCompletionOption::KIND_ENUM);
+						break;
+					case GDScriptParser::ClassNode::Member::FUNCTION:
+						if (outer || (p_static && !member.function->is_static) || member.function->identifier->name.operator String().begins_with("@")) {
+							continue;
+						}
+						option = ScriptCodeCompletionOption(member.function->identifier->name, ScriptCodeCompletionOption::KIND_FUNCTION);
+						if (member.function->parameters.size() > 0) {
+							option.insert_text += "(";
+						} else {
+							option.insert_text += "()";
+						}
+						break;
+					case GDScriptParser::ClassNode::Member::SIGNAL:
+						if (p_only_functions || outer) {
+							clss = clss->outer;
+							continue;
+						}
+						option = ScriptCodeCompletionOption(member.signal->identifier->name, ScriptCodeCompletionOption::KIND_SIGNAL);
+						break;
+					case GDScriptParser::ClassNode::Member::UNDEFINED:
+						break;
+				}
+				r_result.insert(option.display, option);
+			}
+			outer = true;
+			clss = clss->outer;
+		}
+	}
+
+	// Parents.
+	GDScriptCompletionIdentifier base_type;
+	base_type.type = p_class->base_type;
+	base_type.type.is_meta_type = p_static;
+
+	_find_identifiers_in_base(base_type, p_only_functions, r_result);
+}
+
+static void _find_identifiers_in_base(const GDScriptCompletionIdentifier &p_base, bool p_only_functions, Map<String, ScriptCodeCompletionOption> &r_result) {
+	GDScriptParser::DataType base_type = p_base.type;
+	bool _static = base_type.is_meta_type;
+
+	if (_static && base_type.kind != GDScriptParser::DataType::BUILTIN) {
+		ScriptCodeCompletionOption option("new", ScriptCodeCompletionOption::KIND_FUNCTION);
+		option.insert_text += "(";
+		r_result.insert(option.display, option);
+	}
+
+	while (!base_type.has_no_type()) {
+		switch (base_type.kind) {
+			case GDScriptParser::DataType::CLASS: {
+				_find_identifiers_in_class(base_type.class_type, p_only_functions, _static, false, r_result);
+				// This already finds all parent identifiers, so we are done.
+				base_type = GDScriptParser::DataType();
+			} break;
+			case GDScriptParser::DataType::SCRIPT: {
+				Ref<Script> scr = base_type.script_type;
+				if (scr.is_valid()) {
+					if (!p_only_functions) {
+						if (!_static) {
+							List<PropertyInfo> members;
+							scr->get_script_property_list(&members);
+							for (List<PropertyInfo>::Element *E = members.front(); E; E = E->next()) {
+								ScriptCodeCompletionOption option(E->get().name, ScriptCodeCompletionOption::KIND_MEMBER);
+								r_result.insert(option.display, option);
+							}
+						}
+						Map<StringName, Variant> constants;
+						scr->get_constants(&constants);
+						for (Map<StringName, Variant>::Element *E = constants.front(); E; E = E->next()) {
+							ScriptCodeCompletionOption option(E->key().operator String(), ScriptCodeCompletionOption::KIND_CONSTANT);
+							r_result.insert(option.display, option);
+						}
+
+						List<MethodInfo> signals;
+						scr->get_script_signal_list(&signals);
+						for (List<MethodInfo>::Element *E = signals.front(); E; E = E->next()) {
+							ScriptCodeCompletionOption option(E->get().name, ScriptCodeCompletionOption::KIND_SIGNAL);
+							r_result.insert(option.display, option);
+						}
+					}
+
+					List<MethodInfo> methods;
+					scr->get_script_method_list(&methods);
+					for (List<MethodInfo>::Element *E = methods.front(); E; E = E->next()) {
+						if (E->get().name.begins_with("@")) {
+							continue;
+						}
+						ScriptCodeCompletionOption option(E->get().name, ScriptCodeCompletionOption::KIND_FUNCTION);
+						if (E->get().arguments.size()) {
+							option.insert_text += "(";
+						} else {
+							option.insert_text += "()";
+						}
+						r_result.insert(option.display, option);
+					}
+
+					Ref<Script> base_script = scr->get_base_script();
+					if (base_script.is_valid()) {
+						base_type.script_type = base_script;
+					} else {
+						base_type.kind = GDScriptParser::DataType::NATIVE;
+						base_type.native_type = scr->get_instance_base_type();
+					}
+				} else {
+					return;
+				}
+			} break;
+			case GDScriptParser::DataType::NATIVE: {
+				StringName type = _get_real_class_name(base_type.native_type);
+				if (!ClassDB::class_exists(type)) {
+					return;
+				}
+
+				if (!p_only_functions) {
+					List<String> constants;
+					ClassDB::get_integer_constant_list(type, &constants);
+					for (List<String>::Element *E = constants.front(); E; E = E->next()) {
+						ScriptCodeCompletionOption option(E->get(), ScriptCodeCompletionOption::KIND_CONSTANT);
+						r_result.insert(option.display, option);
+					}
+
+					if (!_static || Engine::get_singleton()->has_singleton(type)) {
+						List<PropertyInfo> pinfo;
+						ClassDB::get_property_list(type, &pinfo);
+						for (List<PropertyInfo>::Element *E = pinfo.front(); E; E = E->next()) {
+							if (E->get().usage & (PROPERTY_USAGE_GROUP | PROPERTY_USAGE_CATEGORY)) {
+								continue;
+							}
+							if (E->get().name.find("/") != -1) {
+								continue;
+							}
+							ScriptCodeCompletionOption option(E->get().name, ScriptCodeCompletionOption::KIND_MEMBER);
+							r_result.insert(option.display, option);
+						}
+					}
+				}
+
+				if (!_static || Engine::get_singleton()->has_singleton(type)) {
+					List<MethodInfo> methods;
+					bool is_autocompleting_getters = GLOBAL_GET("debug/gdscript/completion/autocomplete_setters_and_getters").booleanize();
+					ClassDB::get_method_list(type, &methods, false, !is_autocompleting_getters);
+					for (List<MethodInfo>::Element *E = methods.front(); E; E = E->next()) {
+						if (E->get().name.begins_with("_")) {
+							continue;
+						}
+						ScriptCodeCompletionOption option(E->get().name, ScriptCodeCompletionOption::KIND_FUNCTION);
+						if (E->get().arguments.size()) {
+							option.insert_text += "(";
+						} else {
+							option.insert_text += "()";
+						}
+						r_result.insert(option.display, option);
+					}
+				}
+
+				return;
+			} break;
+			case GDScriptParser::DataType::BUILTIN: {
+				Callable::CallError err;
+				Variant tmp = Variant::construct(base_type.builtin_type, nullptr, 0, err);
+				if (err.error != Callable::CallError::CALL_OK) {
+					return;
+				}
+
+				if (!p_only_functions) {
+					List<PropertyInfo> members;
+					if (p_base.value.get_type() != Variant::NIL) {
+						p_base.value.get_property_list(&members);
+					} else {
+						tmp.get_property_list(&members);
+					}
+
+					for (List<PropertyInfo>::Element *E = members.front(); E; E = E->next()) {
+						if (String(E->get().name).find("/") == -1) {
+							ScriptCodeCompletionOption option(E->get().name, ScriptCodeCompletionOption::KIND_MEMBER);
+							r_result.insert(option.display, option);
+						}
+					}
+				}
+
+				List<MethodInfo> methods;
+				tmp.get_method_list(&methods);
+				for (const List<MethodInfo>::Element *E = methods.front(); E; E = E->next()) {
+					ScriptCodeCompletionOption option(E->get().name, ScriptCodeCompletionOption::KIND_FUNCTION);
+					if (E->get().arguments.size()) {
+						option.insert_text += "(";
+					} else {
+						option.insert_text += "()";
+					}
+					r_result.insert(option.display, option);
+				}
+
+				return;
+			} break;
+			default: {
+				return;
+			} break;
+		}
+	}
+}
+
+static void _find_identifiers(GDScriptParser::CompletionContext &p_context, bool p_only_functions, Map<String, ScriptCodeCompletionOption> &r_result) {
+	if (!p_only_functions && p_context.current_suite) {
+		// This includes function parameters, since they are also locals.
+		_find_identifiers_in_suite(p_context.current_suite, r_result);
+	}
+
+	if (p_context.current_class) {
+		_find_identifiers_in_class(p_context.current_class, p_only_functions, (!p_context.current_function || p_context.current_function->is_static), false, r_result);
+	}
+
+	for (int i = 0; i < GDScriptFunctions::FUNC_MAX; i++) {
+		MethodInfo function = GDScriptFunctions::get_info(GDScriptFunctions::Function(i));
+		ScriptCodeCompletionOption option(String(GDScriptFunctions::get_func_name(GDScriptFunctions::Function(i))), ScriptCodeCompletionOption::KIND_FUNCTION);
+		if (function.arguments.size() || (function.flags & METHOD_FLAG_VARARG)) {
+			option.insert_text += "(";
+		} else {
+			option.insert_text += "()";
+		}
+		r_result.insert(option.display, option);
+	}
+
+	if (p_only_functions) {
+		return;
+	}
+
+	static const char *_type_names[Variant::VARIANT_MAX] = {
+		"null", "bool", "int", "float", "String", "StringName", "Vector2", "Vector2i", "Rect2", "Rect2i", "Vector3", "Vector3i", "Transform2D", "Plane", "Quat", "AABB", "Basis", "Transform",
+		"Color", "NodePath", "RID", "Signal", "Callable", "Object", "Dictionary", "Array", "PackedByteArray", "PackedInt32Array", "PackedInt64Array", "PackedFloat32Array", "PackedFloat64Array", "PackedStringArray",
+		"PackedVector2Array", "PackedVector3Array", "PackedColorArray"
+	};
+	static_assert((sizeof(_type_names) / sizeof(*_type_names)) == Variant::VARIANT_MAX, "Completion for builtin types is incomplete");
+
+	for (int i = 0; i < Variant::VARIANT_MAX; i++) {
+		ScriptCodeCompletionOption option(_type_names[i], ScriptCodeCompletionOption::KIND_CLASS);
+		r_result.insert(option.display, option);
+	}
+
+	static const char *_keywords[] = {
+		"and", "in", "not", "or", "false", "PI", "TAU", "INF", "NAN", "self", "true", "as", "assert",
+		"breakpoint", "class", "extends", "is", "func", "preload", "signal", "tool", "await",
+		"const", "enum", "static", "super", "var", "break", "continue", "if", "elif",
+		"else", "for", "pass", "return", "match", "while",
+		0
+	};
+
+	const char **kw = _keywords;
+	while (*kw) {
+		ScriptCodeCompletionOption option(*kw, ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+		r_result.insert(option.display, option);
+		kw++;
+	}
+
+	Map<StringName, ProjectSettings::AutoloadInfo> autoloads = ProjectSettings::get_singleton()->get_autoload_list();
+	for (const Map<StringName, ProjectSettings::AutoloadInfo>::Element *E = autoloads.front(); E != nullptr; E = E->next()) {
+		if (!E->value().is_singleton) {
+			continue;
+		}
+		ScriptCodeCompletionOption option(E->key(), ScriptCodeCompletionOption::KIND_CONSTANT);
+		r_result.insert(option.display, option);
+	}
+
+	// Native classes and global constants.
+	for (const Map<StringName, int>::Element *E = GDScriptLanguage::get_singleton()->get_global_map().front(); E; E = E->next()) {
+		ScriptCodeCompletionOption option;
+		if (ClassDB::class_exists(E->key()) || Engine::get_singleton()->has_singleton(E->key())) {
+			option = ScriptCodeCompletionOption(E->key().operator String(), ScriptCodeCompletionOption::KIND_CLASS);
+		} else {
+			option = ScriptCodeCompletionOption(E->key().operator String(), ScriptCodeCompletionOption::KIND_CONSTANT);
+		}
+		r_result.insert(option.display, option);
+	}
+}
+
+static GDScriptCompletionIdentifier _type_from_variant(const Variant &p_value) {
+	GDScriptCompletionIdentifier ci;
+	ci.value = p_value;
+	ci.type.is_constant = true;
+	ci.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+	ci.type.kind = GDScriptParser::DataType::BUILTIN;
+	ci.type.builtin_type = p_value.get_type();
+
+	if (ci.type.builtin_type == Variant::OBJECT) {
+		Object *obj = p_value.operator Object *();
+		if (!obj) {
+			return ci;
+		}
+		ci.type.native_type = obj->get_class_name();
+		Ref<Script> scr = p_value;
+		if (scr.is_valid()) {
+			ci.type.is_meta_type = true;
+		} else {
+			ci.type.is_meta_type = false;
+			scr = obj->get_script();
+		}
+		if (scr.is_valid()) {
+			ci.type.script_type = scr;
+			ci.type.kind = GDScriptParser::DataType::SCRIPT;
+			ci.type.native_type = scr->get_instance_base_type();
+		} else {
+			ci.type.kind = GDScriptParser::DataType::NATIVE;
+		}
+	}
+
+	return ci;
+}
+
+static GDScriptCompletionIdentifier _type_from_property(const PropertyInfo &p_property) {
+	GDScriptCompletionIdentifier ci;
+
+	if (p_property.type == Variant::NIL) {
+		// Variant
+		return ci;
+	}
+
+	if (p_property.usage & PROPERTY_USAGE_CLASS_IS_ENUM) {
+		ci.enumeration = p_property.class_name;
+	}
+
+	ci.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+	ci.type.builtin_type = p_property.type;
+	if (p_property.type == Variant::OBJECT) {
+		ci.type.kind = GDScriptParser::DataType::NATIVE;
+		ci.type.native_type = p_property.class_name == StringName() ? "Object" : p_property.class_name;
+	} else {
+		ci.type.kind = GDScriptParser::DataType::BUILTIN;
+	}
+	return ci;
+}
+
+static bool _guess_identifier_type(GDScriptParser::CompletionContext &p_context, const StringName &p_identifier, GDScriptCompletionIdentifier &r_type);
+static bool _guess_identifier_type_from_base(GDScriptParser::CompletionContext &p_context, const GDScriptCompletionIdentifier &p_base, const StringName &p_identifier, GDScriptCompletionIdentifier &r_type);
+static bool _guess_method_return_type_from_base(GDScriptParser::CompletionContext &p_context, const GDScriptCompletionIdentifier &p_base, const StringName &p_method, GDScriptCompletionIdentifier &r_type);
+
+static bool _guess_expression_type(GDScriptParser::CompletionContext &p_context, const GDScriptParser::ExpressionNode *p_expression, GDScriptCompletionIdentifier &r_type) {
+	bool found = false;
+
+	if (p_expression->is_constant) {
+		// Already has a value, so just use that.
+		r_type = _type_from_variant(p_expression->reduced_value);
+		found = true;
+	} else {
+		switch (p_expression->type) {
+			case GDScriptParser::Node::LITERAL: {
+				const GDScriptParser::LiteralNode *literal = static_cast<const GDScriptParser::LiteralNode *>(p_expression);
+				r_type = _type_from_variant(literal->value);
+				found = true;
+			} break;
+			case GDScriptParser::Node::SELF: {
+				if (p_context.current_class) {
+					r_type.type.kind = GDScriptParser::DataType::CLASS;
+					r_type.type.type_source = GDScriptParser::DataType::INFERRED;
+					r_type.type.is_constant = true;
+					r_type.type.class_type = p_context.current_class;
+					r_type.value = p_context.base;
+					found = true;
+				}
+			} break;
+			case GDScriptParser::Node::IDENTIFIER: {
+				const GDScriptParser::IdentifierNode *id = static_cast<const GDScriptParser::IdentifierNode *>(p_expression);
+				found = _guess_identifier_type(p_context, id->name, r_type);
+			} break;
+			case GDScriptParser::Node::DICTIONARY: {
+				// Try to recreate the dictionary.
+				const GDScriptParser::DictionaryNode *dn = static_cast<const GDScriptParser::DictionaryNode *>(p_expression);
+				Dictionary d;
+				bool full = true;
+				for (int i = 0; i < dn->elements.size(); i++) {
+					GDScriptCompletionIdentifier key;
+					if (_guess_expression_type(p_context, dn->elements[i].key, key)) {
+						if (!key.type.is_constant) {
+							full = false;
+							break;
+						}
+						GDScriptCompletionIdentifier value;
+						if (_guess_expression_type(p_context, dn->elements[i].value, value)) {
+							if (!value.type.is_constant) {
+								full = false;
+								break;
+							}
+							d[key.value] = value.value;
+						} else {
+							full = false;
+							break;
+						}
+					} else {
+						full = false;
+						break;
+					}
+				}
+				if (full) {
+					r_type.value = d;
+					r_type.type.is_constant = true;
+				}
+				r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+				r_type.type.kind = GDScriptParser::DataType::BUILTIN;
+				r_type.type.builtin_type = Variant::DICTIONARY;
+				found = true;
+			} break;
+			case GDScriptParser::Node::ARRAY: {
+				// Try to recreate the array
+				const GDScriptParser::ArrayNode *an = static_cast<const GDScriptParser::ArrayNode *>(p_expression);
+				Array a;
+				bool full = true;
+				a.resize(an->elements.size());
+				for (int i = 0; i < an->elements.size(); i++) {
+					GDScriptCompletionIdentifier value;
+					if (_guess_expression_type(p_context, an->elements[i], value)) {
+						if (value.type.is_constant) {
+							a[i] = value.value;
+						} else {
+							full = false;
+							break;
+						}
+					} else {
+						full = false;
+						break;
+					}
+				}
+				if (full) {
+					// If not fully constant, setting this value is detrimental to the inference.
+					r_type.value = a;
+				}
+				r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+				r_type.type.kind = GDScriptParser::DataType::BUILTIN;
+				r_type.type.builtin_type = Variant::ARRAY;
+				found = true;
+			} break;
+			case GDScriptParser::Node::CAST: {
+				const GDScriptParser::CastNode *cn = static_cast<const GDScriptParser::CastNode *>(p_expression);
+				GDScriptCompletionIdentifier value;
+				if (_guess_expression_type(p_context, cn->operand, r_type)) {
+					r_type.type = cn->get_datatype();
+					found = true;
+				}
+			} break;
+			case GDScriptParser::Node::CALL: {
+				const GDScriptParser::CallNode *call = static_cast<const GDScriptParser::CallNode *>(p_expression);
+				if (GDScriptParser::get_builtin_type(call->function_name) < Variant::VARIANT_MAX) {
+					r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+					r_type.type.kind = GDScriptParser::DataType::BUILTIN;
+					r_type.type.builtin_type = GDScriptParser::get_builtin_type(call->function_name);
+					found = true;
+					break;
+				} else if (GDScriptParser::get_builtin_function(call->function_name) < GDScriptFunctions::FUNC_MAX) {
+					MethodInfo mi = GDScriptFunctions::get_info(GDScriptParser::get_builtin_function(call->function_name));
+					r_type = _type_from_property(mi.return_val);
+					found = true;
+					break;
+				} else {
+					GDScriptParser::CompletionContext c = p_context;
+					c.current_line = call->start_line;
+
+					GDScriptCompletionIdentifier base;
+					if (call->callee->type == GDScriptParser::Node::IDENTIFIER || call->is_super) {
+						// Simple call, so base is 'self'.
+						if (p_context.current_class) {
+							base.type.kind = GDScriptParser::DataType::CLASS;
+							base.type.type_source = GDScriptParser::DataType::INFERRED;
+							base.type.is_constant = true;
+							base.type.class_type = p_context.current_class;
+							base.value = p_context.base;
+						} else {
+							break;
+						}
+					} else if (call->callee->type == GDScriptParser::Node::SUBSCRIPT && static_cast<const GDScriptParser::SubscriptNode *>(call->callee)->is_attribute) {
+						if (!_guess_expression_type(c, static_cast<const GDScriptParser::SubscriptNode *>(call->callee)->base, base)) {
+							found = false;
+							break;
+						}
+					} else {
+						break;
+					}
+
+					// Try call if constant methods with constant arguments
+					if (base.type.is_constant && base.value.get_type() == Variant::OBJECT) {
+						GDScriptParser::DataType native_type = base.type;
+
+						while (native_type.kind == GDScriptParser::DataType::CLASS) {
+							native_type = native_type.class_type->base_type;
+						}
+
+						while (native_type.kind == GDScriptParser::DataType::SCRIPT) {
+							if (native_type.script_type.is_valid()) {
+								Ref<Script> parent = native_type.script_type->get_base_script();
+								if (parent.is_valid()) {
+									native_type.script_type = parent;
+								} else {
+									native_type.kind = GDScriptParser::DataType::NATIVE;
+									native_type.native_type = native_type.script_type->get_instance_base_type();
+									if (!ClassDB::class_exists(native_type.native_type)) {
+										native_type.native_type = String("_") + native_type.native_type;
+										if (!ClassDB::class_exists(native_type.native_type)) {
+											native_type.kind = GDScriptParser::DataType::UNRESOLVED;
+										}
+									}
+								}
+							}
+						}
+
+						if (native_type.kind == GDScriptParser::DataType::NATIVE) {
+							MethodBind *mb = ClassDB::get_method(native_type.native_type, call->function_name);
+							if (mb && mb->is_const()) {
+								bool all_is_const = true;
+								Vector<Variant> args;
+								GDScriptParser::CompletionContext c2 = p_context;
+								c2.current_line = call->start_line;
+								for (int i = 0; all_is_const && i < call->arguments.size(); i++) {
+									GDScriptCompletionIdentifier arg;
+
+									if (!call->arguments[i]->is_constant) {
+										all_is_const = false;
+									}
+								}
+
+								Object *baseptr = base.value;
+
+								if (all_is_const && String(call->function_name) == "get_node" && ClassDB::is_parent_class(native_type.native_type, "Node") && args.size()) {
+									String arg1 = args[0];
+									if (arg1.begins_with("/root/")) {
+										String which = arg1.get_slice("/", 2);
+										if (which != "") {
+											// Try singletons first
+											if (GDScriptLanguage::get_singleton()->get_named_globals_map().has(which)) {
+												r_type = _type_from_variant(GDScriptLanguage::get_singleton()->get_named_globals_map()[which]);
+												found = true;
+											} else {
+												Map<StringName, ProjectSettings::AutoloadInfo> autoloads = ProjectSettings::get_singleton()->get_autoload_list();
+
+												for (Map<StringName, ProjectSettings::AutoloadInfo>::Element *E = autoloads.front(); E; E = E->next()) {
+													String name = E->key();
+													if (name == which) {
+														String script = E->value().path;
+
+														if (!script.begins_with("res://")) {
+															script = "res://" + script;
+														}
+
+														if (!script.ends_with(".gd")) {
+															//not a script, try find the script anyway,
+															//may have some success
+															script = script.get_basename() + ".gd";
+														}
+
+														if (FileAccess::exists(script)) {
+															Error err = OK;
+															Ref<GDScriptParserRef> parser = GDScriptCache::get_parser(script, GDScriptParserRef::INTERFACE_SOLVED, err);
+															if (err == OK) {
+																r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+																r_type.type.script_path = script;
+																r_type.type.class_type = parser->get_parser()->get_tree();
+																r_type.type.is_constant = false;
+																r_type.type.kind = GDScriptParser::DataType::CLASS;
+																r_type.value = Variant();
+																p_context.dependent_parsers.push_back(parser);
+																found = true;
+															}
+														}
+														break;
+													}
+												}
+											}
+										}
+									}
+								}
+
+								if (!found && all_is_const && baseptr) {
+									Vector<const Variant *> argptr;
+									for (int i = 0; i < args.size(); i++) {
+										argptr.push_back(&args[i]);
+									}
+
+									Callable::CallError ce;
+									Variant ret = mb->call(baseptr, (const Variant **)argptr.ptr(), argptr.size(), ce);
+
+									if (ce.error == Callable::CallError::CALL_OK && ret.get_type() != Variant::NIL) {
+										if (ret.get_type() != Variant::OBJECT || ret.operator Object *() != nullptr) {
+											r_type = _type_from_variant(ret);
+											found = true;
+										}
+									}
+								}
+							}
+						}
+					}
+
+					if (!found) {
+						found = _guess_method_return_type_from_base(c, base, call->function_name, r_type);
+					}
+				}
+			} break;
+			case GDScriptParser::Node::SUBSCRIPT: {
+				const GDScriptParser::SubscriptNode *subscript = static_cast<const GDScriptParser::SubscriptNode *>(p_expression);
+				if (subscript->is_attribute) {
+					GDScriptParser::CompletionContext c = p_context;
+					c.current_line = subscript->start_line;
+
+					GDScriptCompletionIdentifier base;
+					if (!_guess_expression_type(c, subscript->base, base)) {
+						found = false;
+						break;
+					}
+
+					if (base.value.get_type() == Variant::DICTIONARY && base.value.operator Dictionary().has(String(subscript->attribute->name))) {
+						Variant value = base.value.operator Dictionary()[String(subscript->attribute->name)];
+						r_type = _type_from_variant(value);
+						found = true;
+						break;
+					}
+
+					const GDScriptParser::DictionaryNode *dn = nullptr;
+					if (subscript->base->type == GDScriptParser::Node::DICTIONARY) {
+						dn = static_cast<const GDScriptParser::DictionaryNode *>(subscript->base);
+					} else if (base.assigned_expression && base.assigned_expression->type == GDScriptParser::Node::DICTIONARY) {
+						dn = static_cast<const GDScriptParser::DictionaryNode *>(base.assigned_expression);
+					}
+
+					if (dn) {
+						for (int i = 0; i < dn->elements.size(); i++) {
+							GDScriptCompletionIdentifier key;
+							if (!_guess_expression_type(c, dn->elements[i].key, key)) {
+								continue;
+							}
+							if (key.value == String(subscript->attribute->name)) {
+								r_type.assigned_expression = dn->elements[i].value;
+								found = _guess_expression_type(c, dn->elements[i].value, r_type);
+								break;
+							}
+						}
+					}
+
+					if (!found) {
+						found = _guess_identifier_type_from_base(c, base, subscript->attribute->name, r_type);
+					}
+				} else {
+					if (subscript->index == nullptr) {
+						found = false;
+						break;
+					}
+
+					GDScriptParser::CompletionContext c = p_context;
+					c.current_line = subscript->start_line;
+
+					GDScriptCompletionIdentifier base;
+					if (!_guess_expression_type(c, subscript->base, base)) {
+						found = false;
+						break;
+					}
+
+					GDScriptCompletionIdentifier index;
+					if (!_guess_expression_type(c, subscript->index, index)) {
+						found = false;
+						break;
+					}
+
+					if (base.value.in(index.value)) {
+						Variant value = base.value.get(index.value);
+						r_type = _type_from_variant(value);
+						found = true;
+						break;
+					}
+
+					// Look if it is a dictionary node.
+					const GDScriptParser::DictionaryNode *dn = nullptr;
+					if (subscript->base->type == GDScriptParser::Node::DICTIONARY) {
+						dn = static_cast<const GDScriptParser::DictionaryNode *>(subscript->base);
+					} else if (base.assigned_expression && base.assigned_expression->type == GDScriptParser::Node::DICTIONARY) {
+						dn = static_cast<const GDScriptParser::DictionaryNode *>(base.assigned_expression);
+					}
+
+					if (dn) {
+						for (int i = 0; i < dn->elements.size(); i++) {
+							GDScriptCompletionIdentifier key;
+							if (!_guess_expression_type(c, dn->elements[i].key, key)) {
+								continue;
+							}
+							if (key.value == index.value) {
+								r_type.assigned_expression = dn->elements[i].value;
+								found = _guess_expression_type(p_context, dn->elements[i].value, r_type);
+								break;
+							}
+						}
+					}
+
+					// Look if it is an array node.
+					if (!found && index.value.is_num()) {
+						int idx = index.value;
+						const GDScriptParser::ArrayNode *an = nullptr;
+						if (subscript->base->type == GDScriptParser::Node::ARRAY) {
+							an = static_cast<const GDScriptParser::ArrayNode *>(subscript->base);
+						} else if (base.assigned_expression && base.assigned_expression->type == GDScriptParser::Node::ARRAY) {
+							an = static_cast<const GDScriptParser::ArrayNode *>(base.assigned_expression);
+						}
+
+						if (an && idx >= 0 && an->elements.size() > idx) {
+							r_type.assigned_expression = an->elements[idx];
+							found = _guess_expression_type(c, an->elements[idx], r_type);
+							break;
+						}
+					}
+
+					// Look for valid indexing in other types
+					if (!found && (index.value.get_type() == Variant::STRING || index.value.get_type() == Variant::NODE_PATH)) {
+						StringName id = index.value;
+						found = _guess_identifier_type_from_base(c, base, id, r_type);
+					} else if (!found && index.type.kind == GDScriptParser::DataType::BUILTIN) {
+						Callable::CallError err;
+						Variant base_val = Variant::construct(base.type.builtin_type, nullptr, 0, err);
+						bool valid = false;
+						Variant res = base_val.get(index.value, &valid);
+						if (valid) {
+							r_type = _type_from_variant(res);
+							r_type.value = Variant();
+							r_type.type.is_constant = false;
+							found = true;
+						}
+					}
+				}
+			} break;
+			case GDScriptParser::Node::BINARY_OPERATOR: {
+				const GDScriptParser::BinaryOpNode *op = static_cast<const GDScriptParser::BinaryOpNode *>(p_expression);
+
+				if (op->variant_op == Variant::OP_MAX) {
+					break;
+				}
+
+				GDScriptParser::CompletionContext context = p_context;
+				context.current_line = op->start_line;
+
+				GDScriptCompletionIdentifier p1;
+				GDScriptCompletionIdentifier p2;
+
+				if (!_guess_expression_type(context, op->left_operand, p1)) {
+					found = false;
+					break;
+				}
+
+				if (!_guess_expression_type(context, op->right_operand, p2)) {
+					found = false;
+					break;
+				}
+
+				Callable::CallError ce;
+				bool v1_use_value = p1.value.get_type() != Variant::NIL && p1.value.get_type() != Variant::OBJECT;
+				Variant v1 = (v1_use_value) ? p1.value : Variant::construct(p1.type.builtin_type, nullptr, 0, ce);
+				bool v2_use_value = p2.value.get_type() != Variant::NIL && p2.value.get_type() != Variant::OBJECT;
+				Variant v2 = (v2_use_value) ? p2.value : Variant::construct(p2.type.builtin_type, nullptr, 0, ce);
+				// avoid potential invalid ops
+				if ((op->variant_op == Variant::OP_DIVIDE || op->variant_op == Variant::OP_MODULE) && v2.get_type() == Variant::INT) {
+					v2 = 1;
+					v2_use_value = false;
+				}
+				if (op->variant_op == Variant::OP_DIVIDE && v2.get_type() == Variant::FLOAT) {
+					v2 = 1.0;
+					v2_use_value = false;
+				}
+
+				Variant res;
+				bool valid;
+				Variant::evaluate(op->variant_op, v1, v2, res, valid);
+				if (!valid) {
+					found = false;
+					break;
+				}
+				r_type = _type_from_variant(res);
+				if (!v1_use_value || !v2_use_value) {
+					r_type.value = Variant();
+					r_type.type.is_constant = false;
+				}
+
+				found = true;
+			} break;
+			default:
+				break;
+		}
+	}
+
+	// It may have found a null, but that's never useful
+	if (found && r_type.type.kind == GDScriptParser::DataType::BUILTIN && r_type.type.builtin_type == Variant::NIL) {
+		found = false;
+	}
+
+	// Check type hint last. For collections we want chance to get the actual value first
+	// This way we can detect types from the content of dictionaries and arrays
+	if (!found && p_expression->get_datatype().is_hard_type()) {
+		r_type.type = p_expression->get_datatype();
+		if (!r_type.assigned_expression) {
+			r_type.assigned_expression = p_expression;
+		}
+		found = true;
+	}
+
+	return found;
+}
+
+static bool _guess_identifier_type(GDScriptParser::CompletionContext &p_context, const StringName &p_identifier, GDScriptCompletionIdentifier &r_type) {
+	// Look in blocks first.
+	int last_assign_line = -1;
+	const GDScriptParser::ExpressionNode *last_assigned_expression = nullptr;
+	GDScriptParser::DataType id_type;
+	GDScriptParser::SuiteNode *suite = p_context.current_suite;
+	bool is_function_parameter = false;
+
+	if (suite) {
+		if (suite->has_local(p_identifier)) {
+			const GDScriptParser::SuiteNode::Local &local = suite->get_local(p_identifier);
+
+			id_type = local.get_datatype();
+
+			// Check initializer as the first assignment.
+			switch (local.type) {
+				case GDScriptParser::SuiteNode::Local::VARIABLE:
+					if (local.variable->initializer) {
+						last_assign_line = local.variable->initializer->end_line;
+						last_assigned_expression = local.variable->initializer;
+					}
+					break;
+				case GDScriptParser::SuiteNode::Local::CONSTANT:
+					if (local.constant->initializer) {
+						last_assign_line = local.constant->initializer->end_line;
+						last_assigned_expression = local.constant->initializer;
+					}
+					break;
+				case GDScriptParser::SuiteNode::Local::PARAMETER:
+					if (local.parameter->default_value) {
+						last_assign_line = local.parameter->default_value->end_line;
+						last_assigned_expression = local.parameter->default_value;
+					}
+					is_function_parameter = true;
+					break;
+				default:
+					break;
+			}
+		}
+	}
+
+	while (suite) {
+		for (int i = 0; i < suite->statements.size(); i++) {
+			if (suite->statements[i]->start_line > p_context.current_line) {
+				break;
+			}
+
+			switch (suite->statements[i]->type) {
+				case GDScriptParser::Node::ASSIGNMENT: {
+					const GDScriptParser::AssignmentNode *assign = static_cast<const GDScriptParser::AssignmentNode *>(suite->statements[i]);
+					if (assign->end_line > last_assign_line && assign->assignee && assign->assigned_value && assign->assignee->type == GDScriptParser::Node::IDENTIFIER) {
+						const GDScriptParser::IdentifierNode *id = static_cast<const GDScriptParser::IdentifierNode *>(assign->assignee);
+						if (id->name == p_identifier) {
+							last_assign_line = assign->assigned_value->end_line;
+							last_assigned_expression = assign->assigned_value;
+						}
+					}
+				} break;
+				default:
+					// TODO: Check sub blocks (control flow statements) as they might also reassign stuff.
+					break;
+			}
+		}
+
+		if (suite->parent_if && suite->parent_if->condition && suite->parent_if->condition->type == GDScriptParser::Node::BINARY_OPERATOR && static_cast<const GDScriptParser::BinaryOpNode *>(suite->parent_if->condition)->operation == GDScriptParser::BinaryOpNode::OP_TYPE_TEST) {
+			// Operator `is` used, check if identifier is in there! this helps resolve in blocks that are (if (identifier is value)): which are very common..
+			// Super dirty hack, but very useful.
+			// Credit: Zylann.
+			// TODO: this could be hacked to detect ANDed conditions too...
+			const GDScriptParser::BinaryOpNode *op = static_cast<const GDScriptParser::BinaryOpNode *>(suite->parent_if->condition);
+			if (op->left_operand && op->right_operand && op->left_operand->type == GDScriptParser::Node::IDENTIFIER && static_cast<const GDScriptParser::IdentifierNode *>(op->left_operand)->name == p_identifier) {
+				// Bingo.
+				GDScriptParser::CompletionContext c = p_context;
+				c.current_line = op->left_operand->start_line;
+				c.current_suite = suite;
+				GDScriptCompletionIdentifier is_type;
+				if (_guess_expression_type(c, op->right_operand, is_type)) {
+					id_type = is_type.type;
+					id_type.is_meta_type = false;
+					if (last_assign_line < c.current_line) {
+						// Override last assignment.
+						last_assign_line = c.current_line;
+						last_assigned_expression = nullptr;
+					}
+				}
+			}
+		}
+
+		suite = suite->parent_block;
+	}
+
+	if (last_assigned_expression && last_assign_line != p_context.current_line) {
+		GDScriptParser::CompletionContext c = p_context;
+		c.current_line = last_assign_line;
+		r_type.assigned_expression = last_assigned_expression;
+		if (_guess_expression_type(c, last_assigned_expression, r_type)) {
+			return true;
+		}
+	}
+
+	if (is_function_parameter && p_context.current_function && p_context.current_class) {
+		// Check if it's override of native function, then we can assume the type from the signature.
+		GDScriptParser::DataType base_type = p_context.current_class->base_type;
+		while (base_type.is_set()) {
+			switch (base_type.kind) {
+				case GDScriptParser::DataType::CLASS:
+					if (base_type.class_type->has_function(p_context.current_function->identifier->name)) {
+						GDScriptParser::FunctionNode *parent_function = base_type.class_type->get_member(p_context.current_function->identifier->name).function;
+						const GDScriptParser::ParameterNode *parameter = parent_function->parameters[parent_function->parameters_indices[p_identifier]];
+						if ((!id_type.is_set() || id_type.is_variant()) && parameter->get_datatype().is_hard_type()) {
+							id_type = parameter->get_datatype();
+						}
+						if (parameter->default_value) {
+							GDScriptParser::CompletionContext c = p_context;
+							c.current_function = parent_function;
+							c.current_class = base_type.class_type;
+							c.base = nullptr;
+							if (_guess_expression_type(c, parameter->default_value, r_type)) {
+								return true;
+							}
+						}
+						base_type = base_type.class_type->base_type;
+					}
+					break;
+				case GDScriptParser::DataType::NATIVE: {
+					if (id_type.is_set() && !id_type.is_variant()) {
+						base_type = GDScriptParser::DataType();
+						break;
+					}
+					StringName real_native = _get_real_class_name(base_type.native_type);
+					MethodInfo info;
+					if (ClassDB::get_method_info(real_native, p_context.current_function->identifier->name, &info)) {
+						for (const List<PropertyInfo>::Element *E = info.arguments.front(); E; E = E->next()) {
+							if (E->get().name == p_identifier) {
+								r_type = _type_from_property(E->get());
+								return true;
+							}
+						}
+					}
+					base_type = GDScriptParser::DataType();
+				} break;
+				default:
+					break;
+			}
+		}
+	}
+
+	if (id_type.is_set() && !id_type.is_variant()) {
+		r_type.type = id_type;
+		return true;
+	}
+
+	// Check current class (including inheritance).
+	if (p_context.current_class) {
+		GDScriptCompletionIdentifier base;
+		base.value = p_context.base;
+		base.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+		base.type.kind = GDScriptParser::DataType::CLASS;
+		base.type.class_type = p_context.current_class;
+		base.type.is_meta_type = p_context.current_function && p_context.current_function->is_static;
+
+		if (_guess_identifier_type_from_base(p_context, base, p_identifier, r_type)) {
+			return true;
+		}
+	}
+
+	// Check global scripts.
+	if (ScriptServer::is_global_class(p_identifier)) {
+		String script = ScriptServer::get_global_class_path(p_identifier);
+		if (script.to_lower().ends_with(".gd")) {
+			Error err = OK;
+			Ref<GDScriptParserRef> parser = GDScriptCache::get_parser(script, GDScriptParserRef::INTERFACE_SOLVED, err);
+			if (err == OK) {
+				r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+				r_type.type.script_path = script;
+				r_type.type.class_type = parser->get_parser()->get_tree();
+				r_type.type.is_constant = false;
+				r_type.type.kind = GDScriptParser::DataType::CLASS;
+				r_type.value = Variant();
+				p_context.dependent_parsers.push_back(parser);
+				return true;
+			}
+		} else {
+			Ref<Script> scr = ResourceLoader::load(ScriptServer::get_global_class_path(p_identifier));
+			if (scr.is_valid()) {
+				r_type = _type_from_variant(scr);
+				r_type.type.is_meta_type = true;
+				return true;
+			}
+		}
+		return false;
+	}
+
+	// Check autoloads.
+	if (ProjectSettings::get_singleton()->has_autoload(p_identifier)) {
+		r_type = _type_from_variant(GDScriptLanguage::get_singleton()->get_named_globals_map()[p_identifier]);
+		return true;
+	}
+
+	// Check ClassDB.
+	StringName class_name = _get_real_class_name(p_identifier);
+	if (ClassDB::class_exists(class_name) && ClassDB::is_class_exposed(class_name)) {
+		r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+		r_type.type.kind = GDScriptParser::DataType::NATIVE;
+		r_type.type.native_type = p_identifier;
+		r_type.type.is_constant = true;
+		r_type.type.is_meta_type = !Engine::get_singleton()->has_singleton(class_name);
+		r_type.value = Variant();
+	}
+
+	return false;
+}
+
+static bool _guess_identifier_type_from_base(GDScriptParser::CompletionContext &p_context, const GDScriptCompletionIdentifier &p_base, const StringName &p_identifier, GDScriptCompletionIdentifier &r_type) {
+	GDScriptParser::DataType base_type = p_base.type;
+	bool is_static = base_type.is_meta_type;
+	while (base_type.is_set()) {
+		switch (base_type.kind) {
+			case GDScriptParser::DataType::CLASS:
+				if (base_type.class_type->has_member(p_identifier)) {
+					const GDScriptParser::ClassNode::Member &member = base_type.class_type->get_member(p_identifier);
+					switch (member.type) {
+						case GDScriptParser::ClassNode::Member::CONSTANT:
+							r_type.type = member.constant->get_datatype();
+							if (member.constant->initializer && member.constant->initializer->is_constant) {
+								r_type.value = member.constant->initializer->reduced_value;
+							}
+							return true;
+						case GDScriptParser::ClassNode::Member::VARIABLE:
+							if (!is_static) {
+								if (member.variable->initializer) {
+									const GDScriptParser::ExpressionNode *init = member.variable->initializer;
+									if (init->is_constant) {
+										r_type.value = init->reduced_value;
+										r_type = _type_from_variant(init->reduced_value);
+										return true;
+									} else if (init->start_line == p_context.current_line) {
+										return false;
+									} else if (_guess_expression_type(p_context, init, r_type)) {
+										return true;
+									} else if (init->get_datatype().is_set() && !init->get_datatype().is_variant()) {
+										r_type.type = init->get_datatype();
+										return true;
+									}
+								} else if (member.variable->get_datatype().is_set() && !member.variable->get_datatype().is_variant()) {
+									r_type.type = member.variable->get_datatype();
+									return true;
+								}
+							}
+							// TODO: Check assignments in constructor.
+							return false;
+						case GDScriptParser::ClassNode::Member::ENUM:
+							r_type.type = member.m_enum->get_datatype();
+							r_type.enumeration = member.m_enum->identifier->name;
+							return true;
+						case GDScriptParser::ClassNode::Member::ENUM_VALUE:
+							r_type = _type_from_variant(member.enum_value.value);
+							return true;
+						case GDScriptParser::ClassNode::Member::SIGNAL:
+							r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+							r_type.type.kind = GDScriptParser::DataType::BUILTIN;
+							r_type.type.builtin_type = Variant::SIGNAL;
+							return true;
+						case GDScriptParser::ClassNode::Member::FUNCTION:
+							if (is_static && !member.function->is_static) {
+								return false;
+							}
+							r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+							r_type.type.kind = GDScriptParser::DataType::BUILTIN;
+							r_type.type.builtin_type = Variant::CALLABLE;
+							return true;
+						case GDScriptParser::ClassNode::Member::CLASS:
+							r_type.type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
+							r_type.type.kind = GDScriptParser::DataType::CLASS;
+							r_type.type.class_type = member.m_class;
+							return true;
+						case GDScriptParser::ClassNode::Member::UNDEFINED:
+							return false; // Unreachable.
+					}
+					return false;
+				}
+				base_type = base_type.class_type->base_type;
+				break;
+			case GDScriptParser::DataType::SCRIPT: {
+				Ref<Script> scr = base_type.script_type;
+				if (scr.is_valid()) {
+					Map<StringName, Variant> constants;
+					scr->get_constants(&constants);
+					if (constants.has(p_identifier)) {
+						r_type = _type_from_variant(constants[p_identifier]);
+						return true;
+					}
+
+					if (!is_static) {
+						List<PropertyInfo> members;
+						scr->get_script_property_list(&members);
+						for (const List<PropertyInfo>::Element *E = members.front(); E; E = E->next()) {
+							const PropertyInfo &prop = E->get();
+							if (prop.name == p_identifier) {
+								r_type = _type_from_property(prop);
+								return true;
+							}
+						}
+					}
+					Ref<Script> parent = scr->get_base_script();
+					if (parent.is_valid()) {
+						base_type.script_type = parent;
+					} else {
+						base_type.kind = GDScriptParser::DataType::NATIVE;
+						base_type.native_type = scr->get_instance_base_type();
+					}
+				} else {
+					return false;
+				}
+			} break;
+			case GDScriptParser::DataType::NATIVE: {
+				StringName class_name = _get_real_class_name(base_type.native_type);
+				if (!ClassDB::class_exists(class_name)) {
+					return false;
+				}
+
+				// Skip constants since they're all integers. Type does not matter because int has no members.
+
+				PropertyInfo prop;
+				if (ClassDB::get_property_info(class_name, p_identifier, &prop)) {
+					StringName getter = ClassDB::get_property_getter(class_name, p_identifier);
+					if (getter != StringName()) {
+						MethodBind *g = ClassDB::get_method(class_name, getter);
+						if (g) {
+							r_type = _type_from_property(g->get_return_info());
+							return true;
+						}
+					} else {
+						r_type = _type_from_property(prop);
+						return true;
+					}
+				}
+				return false;
+			} break;
+			case GDScriptParser::DataType::BUILTIN: {
+				Callable::CallError err;
+				Variant tmp = Variant::construct(base_type.builtin_type, nullptr, 0, err);
+
+				if (err.error != Callable::CallError::CALL_OK) {
+					return false;
+				}
+				bool valid = false;
+				Variant res = tmp.get(p_identifier, &valid);
+				if (valid) {
+					r_type = _type_from_variant(res);
+					r_type.value = Variant();
+					r_type.type.is_constant = false;
+					return true;
+				}
+				return false;
+			} break;
+			default: {
+				return false;
+			} break;
+		}
+	}
+	return false;
+}
+
+static void _find_last_return_in_block(GDScriptParser::CompletionContext &p_context, int &r_last_return_line, const GDScriptParser::ExpressionNode **r_last_returned_value) {
+	if (!p_context.current_suite) {
+		return;
+	}
+
+	for (int i = 0; i < p_context.current_suite->statements.size(); i++) {
+		if (p_context.current_suite->statements[i]->start_line < r_last_return_line) {
+			break;
+		}
+
+		GDScriptParser::CompletionContext c = p_context;
+		switch (p_context.current_suite->statements[i]->type) {
+			case GDScriptParser::Node::FOR:
+				c.current_suite = static_cast<const GDScriptParser::ForNode *>(p_context.current_suite->statements[i])->loop;
+				_find_last_return_in_block(c, r_last_return_line, r_last_returned_value);
+				break;
+			case GDScriptParser::Node::WHILE:
+				c.current_suite = static_cast<const GDScriptParser::WhileNode *>(p_context.current_suite->statements[i])->loop;
+				_find_last_return_in_block(c, r_last_return_line, r_last_returned_value);
+				break;
+			case GDScriptParser::Node::IF: {
+				const GDScriptParser::IfNode *_if = static_cast<const GDScriptParser::IfNode *>(p_context.current_suite->statements[i]);
+				c.current_suite = _if->true_block;
+				_find_last_return_in_block(c, r_last_return_line, r_last_returned_value);
+				if (_if->false_block) {
+					c.current_suite = _if->false_block;
+					_find_last_return_in_block(c, r_last_return_line, r_last_returned_value);
+				}
+			} break;
+			case GDScriptParser::Node::MATCH: {
+				const GDScriptParser::MatchNode *match = static_cast<const GDScriptParser::MatchNode *>(p_context.current_suite->statements[i]);
+				for (int i = 0; i < match->branches.size(); i++) {
+					c.current_suite = match->branches[i]->block;
+					_find_last_return_in_block(c, r_last_return_line, r_last_returned_value);
+				}
+			} break;
+			case GDScriptParser::Node::RETURN: {
+				const GDScriptParser::ReturnNode *ret = static_cast<const GDScriptParser::ReturnNode *>(p_context.current_suite->statements[i]);
+				if (ret->return_value) {
+					if (ret->start_line > r_last_return_line) {
+						r_last_return_line = ret->start_line;
+						*r_last_returned_value = ret->return_value;
+					}
+				}
+			} break;
+			default:
+				break;
+		}
+	}
+}
+
+static bool _guess_method_return_type_from_base(GDScriptParser::CompletionContext &p_context, const GDScriptCompletionIdentifier &p_base, const StringName &p_method, GDScriptCompletionIdentifier &r_type) {
+	GDScriptParser::DataType base_type = p_base.type;
+	bool is_static = base_type.is_meta_type;
+
+	if (is_static && p_method == "new") {
+		r_type.type = base_type;
+		r_type.type.is_meta_type = false;
+		r_type.type.is_constant = false;
+		return true;
+	}
+
+	while (base_type.is_set() && !base_type.is_variant()) {
+		switch (base_type.kind) {
+			case GDScriptParser::DataType::CLASS:
+				if (base_type.class_type->has_function(p_method)) {
+					const GDScriptParser::FunctionNode *method = base_type.class_type->get_member(p_method).function;
+					if (!is_static || method->is_static) {
+						int last_return_line = -1;
+						const GDScriptParser::ExpressionNode *last_returned_value = nullptr;
+						GDScriptParser::CompletionContext c = p_context;
+						c.current_class = base_type.class_type;
+						c.current_function = const_cast<GDScriptParser::FunctionNode *>(method);
+						c.current_suite = method->body;
+
+						_find_last_return_in_block(c, last_return_line, &last_returned_value);
+						if (last_returned_value) {
+							c.current_line = c.current_suite->end_line;
+							if (_guess_expression_type(c, last_returned_value, r_type)) {
+								return true;
+							}
+							if (method->get_datatype().is_set() && !method->get_datatype().is_variant()) {
+								r_type.type = method->get_datatype();
+								return true;
+							}
+						}
+					}
+				}
+				base_type = base_type.class_type->base_type;
+				break;
+			case GDScriptParser::DataType::SCRIPT: {
+				Ref<Script> scr = base_type.script_type;
+				if (scr.is_valid()) {
+					List<MethodInfo> methods;
+					scr->get_script_method_list(&methods);
+					for (List<MethodInfo>::Element *E = methods.front(); E; E = E->next()) {
+						MethodInfo &mi = E->get();
+						if (mi.name == p_method) {
+							r_type = _type_from_property(mi.return_val);
+							return true;
+						}
+					}
+					Ref<Script> base_script = scr->get_base_script();
+					if (base_script.is_valid()) {
+						base_type.script_type = base_script;
+					} else {
+						base_type.kind = GDScriptParser::DataType::NATIVE;
+						base_type.native_type = scr->get_instance_base_type();
+					}
+				} else {
+					return false;
+				}
+			} break;
+			case GDScriptParser::DataType::NATIVE: {
+				StringName native = _get_real_class_name(base_type.native_type);
+				if (!ClassDB::class_exists(native)) {
+					return false;
+				}
+				MethodBind *mb = ClassDB::get_method(native, p_method);
+				if (mb) {
+					r_type = _type_from_property(mb->get_return_info());
+					return true;
+				}
+				return false;
+			} break;
+			case GDScriptParser::DataType::BUILTIN: {
+				Callable::CallError err;
+				Variant tmp = Variant::construct(base_type.builtin_type, nullptr, 0, err);
+				if (err.error != Callable::CallError::CALL_OK) {
+					return false;
+				}
+
+				List<MethodInfo> methods;
+				tmp.get_method_list(&methods);
+
+				for (List<MethodInfo>::Element *E = methods.front(); E; E = E->next()) {
+					MethodInfo &mi = E->get();
+					if (mi.name == p_method) {
+						r_type = _type_from_property(mi.return_val);
+						return true;
+					}
+				}
+				return false;
+			} break;
+			default: {
+				return false;
+			}
+		}
+	}
+
+	return false;
+}
+
+static void _find_enumeration_candidates(GDScriptParser::CompletionContext &p_context, const String &p_enum_hint, Map<String, ScriptCodeCompletionOption> &r_result) {
+	if (p_enum_hint.find(".") == -1) {
+		// Global constant or in the current class.
+		StringName current_enum = p_enum_hint;
+		if (p_context.current_class && p_context.current_class->has_member(current_enum) && p_context.current_class->get_member(current_enum).type == GDScriptParser::ClassNode::Member::ENUM) {
+			const GDScriptParser::EnumNode *_enum = p_context.current_class->get_member(current_enum).m_enum;
+			for (int i = 0; i < _enum->values.size(); i++) {
+				ScriptCodeCompletionOption option(_enum->values[i].identifier->name, ScriptCodeCompletionOption::KIND_ENUM);
+				r_result.insert(option.display, option);
+			}
+		} else {
+			for (int i = 0; i < GlobalConstants::get_global_constant_count(); i++) {
+				if (GlobalConstants::get_global_constant_enum(i) == current_enum) {
+					ScriptCodeCompletionOption option(GlobalConstants::get_global_constant_name(i), ScriptCodeCompletionOption::KIND_ENUM);
+					r_result.insert(option.display, option);
+				}
+			}
+		}
+	} else {
+		String class_name = p_enum_hint.get_slice(".", 0);
+		String enum_name = p_enum_hint.get_slice(".", 1);
+
+		if (!ClassDB::class_exists(class_name)) {
+			return;
+		}
+
+		List<StringName> enum_constants;
+		ClassDB::get_enum_constants(class_name, enum_name, &enum_constants);
+		for (List<StringName>::Element *E = enum_constants.front(); E; E = E->next()) {
+			String candidate = class_name + "." + E->get();
+			ScriptCodeCompletionOption option(candidate, ScriptCodeCompletionOption::KIND_ENUM);
+			r_result.insert(option.display, option);
+		}
+	}
+}
+
+static void _find_call_arguments(GDScriptParser::CompletionContext &p_context, const GDScriptCompletionIdentifier &p_base, const StringName &p_method, int p_argidx, bool p_static, Map<String, ScriptCodeCompletionOption> &r_result, String &r_arghint) {
+	Variant base = p_base.value;
+	GDScriptParser::DataType base_type = p_base.type;
+
+	const String quote_style = EDITOR_DEF("text_editor/completion/use_single_quotes", false) ? "'" : "\"";
+
+	while (base_type.is_set() && !base_type.is_variant()) {
+		switch (base_type.kind) {
+			case GDScriptParser::DataType::CLASS: {
+				if (base_type.class_type->has_member(p_method)) {
+					const GDScriptParser::ClassNode::Member &member = base_type.class_type->get_member(p_method);
+
+					if (member.type == GDScriptParser::ClassNode::Member::FUNCTION) {
+						r_arghint = _make_arguments_hint(member.function, p_argidx);
+						return;
+					}
+				}
+
+				base_type = base_type.class_type->base_type;
+			} break;
+			case GDScriptParser::DataType::NATIVE: {
+				StringName class_name = _get_real_class_name(base_type.native_type);
+				if (!ClassDB::class_exists(class_name)) {
+					base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+					break;
+				}
+
+				MethodInfo info;
+				int method_args = 0;
+
+				if (ClassDB::get_method_info(class_name, p_method, &info)) {
+					method_args = info.arguments.size();
+					if (base.get_type() == Variant::OBJECT) {
+						Object *obj = base.operator Object *();
+						if (obj) {
+							List<String> options;
+							obj->get_argument_options(p_method, p_argidx, &options);
+							for (List<String>::Element *F = options.front(); F; F = F->next()) {
+								ScriptCodeCompletionOption option(F->get(), ScriptCodeCompletionOption::KIND_FUNCTION);
+								r_result.insert(option.display, option);
+							}
+						}
+					}
+
+					if (p_argidx < method_args) {
+						PropertyInfo arg_info = info.arguments[p_argidx];
+						if (arg_info.usage & PROPERTY_USAGE_CLASS_IS_ENUM) {
+							_find_enumeration_candidates(p_context, arg_info.class_name, r_result);
+						}
+					}
+
+					r_arghint = _make_arguments_hint(info, p_argidx);
+					return;
+				}
+
+				if (ClassDB::is_parent_class(class_name, "Node") && (p_method == "get_node" || p_method == "has_node") && p_argidx == 0) {
+					// Get autoloads
+					List<PropertyInfo> props;
+					ProjectSettings::get_singleton()->get_property_list(&props);
+
+					for (List<PropertyInfo>::Element *E = props.front(); E; E = E->next()) {
+						String s = E->get().name;
+						if (!s.begins_with("autoload/")) {
+							continue;
+						}
+						String name = s.get_slice("/", 1);
+						ScriptCodeCompletionOption option("/root/" + name, ScriptCodeCompletionOption::KIND_NODE_PATH);
+						option.insert_text = quote_style + option.display + quote_style;
+						r_result.insert(option.display, option);
+					}
+				}
+
+				if (p_argidx == 0 && method_args > 0 && ClassDB::is_parent_class(class_name, "InputEvent") && p_method.operator String().find("action") != -1) {
+					// Get input actions
+					List<PropertyInfo> props;
+					ProjectSettings::get_singleton()->get_property_list(&props);
+					for (List<PropertyInfo>::Element *E = props.front(); E; E = E->next()) {
+						String s = E->get().name;
+						if (!s.begins_with("input/")) {
+							continue;
+						}
+						String name = s.get_slice("/", 1);
+						ScriptCodeCompletionOption option(name, ScriptCodeCompletionOption::KIND_CONSTANT);
+						option.insert_text = quote_style + option.display + quote_style;
+						r_result.insert(option.display, option);
+					}
+				}
+
+				base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+			} break;
+			case GDScriptParser::DataType::BUILTIN: {
+				if (base.get_type() == Variant::NIL) {
+					Callable::CallError err;
+					base = Variant::construct(base_type.builtin_type, nullptr, 0, err);
+					if (err.error != Callable::CallError::CALL_OK) {
+						return;
+					}
+				}
+
+				List<MethodInfo> methods;
+				base.get_method_list(&methods);
+				for (List<MethodInfo>::Element *E = methods.front(); E; E = E->next()) {
+					if (E->get().name == p_method) {
+						r_arghint = _make_arguments_hint(E->get(), p_argidx);
+						return;
+					}
+				}
+
+				base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+			} break;
+			default: {
+				base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+			} break;
+		}
+	}
+}
+
+static void _find_call_arguments(GDScriptParser::CompletionContext &p_context, const GDScriptParser::Node *p_call, int p_argidx, Map<String, ScriptCodeCompletionOption> &r_result, bool &r_forced, String &r_arghint) {
+	const String quote_style = EDITOR_DEF("text_editor/completion/use_single_quotes", false) ? "'" : "\"";
+
+	if (p_call->type == GDScriptParser::Node::PRELOAD) {
+		if (p_argidx == 0 && bool(EditorSettings::get_singleton()->get("text_editor/completion/complete_file_paths"))) {
+			_get_directory_contents(EditorFileSystem::get_singleton()->get_filesystem(), r_result);
+		}
+
+		MethodInfo mi(PropertyInfo(Variant::OBJECT, "resource", PROPERTY_HINT_RESOURCE_TYPE, "Resource"), "preload", PropertyInfo(Variant::STRING, "path"));
+		r_arghint = _make_arguments_hint(mi, p_argidx);
+		return;
+	} else if (p_call->type != GDScriptParser::Node::CALL) {
+		return;
+	}
+
+	Variant base;
+	GDScriptParser::DataType base_type;
+	bool _static = false;
+	const GDScriptParser::CallNode *call = static_cast<const GDScriptParser::CallNode *>(p_call);
+
+	GDScriptCompletionIdentifier connect_base;
+
+	if (GDScriptParser::get_builtin_function(call->function_name) < GDScriptFunctions::FUNC_MAX) {
+		MethodInfo info = GDScriptFunctions::get_info(GDScriptParser::get_builtin_function(call->function_name));
+
+		if ((info.name == "load" || info.name == "preload") && bool(EditorSettings::get_singleton()->get("text_editor/completion/complete_file_paths"))) {
+			_get_directory_contents(EditorFileSystem::get_singleton()->get_filesystem(), r_result);
+		}
+
+		r_arghint = _make_arguments_hint(info, p_argidx);
+		return;
+	} else if (GDScriptParser::get_builtin_type(call->function_name) < Variant::VARIANT_MAX) {
+		// Complete constructor
+		List<MethodInfo> constructors;
+		Variant::get_constructor_list(GDScriptParser::get_builtin_type(call->function_name), &constructors);
+
+		int i = 0;
+		for (List<MethodInfo>::Element *E = constructors.front(); E; E = E->next()) {
+			if (p_argidx >= E->get().arguments.size()) {
+				continue;
+			}
+			if (i > 0) {
+				r_arghint += "\n";
+			}
+			r_arghint += _make_arguments_hint(E->get(), p_argidx);
+			i++;
+		}
+		return;
+	} else if (call->is_super || call->callee->type == GDScriptParser::Node::IDENTIFIER) {
+		base = p_context.base;
+
+		if (p_context.current_class) {
+			base_type = p_context.current_class->get_datatype();
+			_static = !p_context.current_function || p_context.current_function->is_static;
+		}
+	} else if (call->callee->type == GDScriptParser::Node::SUBSCRIPT) {
+		const GDScriptParser::SubscriptNode *subscript = static_cast<const GDScriptParser::SubscriptNode *>(call->callee);
+
+		if (subscript->is_attribute) {
+			GDScriptCompletionIdentifier ci;
+			if (_guess_expression_type(p_context, subscript->base, ci)) {
+				base_type = ci.type;
+				base = ci.value;
+			} else {
+				return;
+			}
+
+			_static = base_type.is_meta_type;
+		}
+	} else {
+		return;
+	}
+
+	GDScriptCompletionIdentifier ci;
+	ci.type = base_type;
+	ci.value = base;
+	_find_call_arguments(p_context, ci, call->function_name, p_argidx, _static, r_result, r_arghint);
+
+	r_forced = r_result.size() > 0;
+}
+
+Error GDScriptLanguage::complete_code(const String &p_code, const String &p_path, Object *p_owner, List<ScriptCodeCompletionOption> *r_options, bool &r_forced, String &r_call_hint) {
+	const String quote_style = EDITOR_DEF("text_editor/completion/use_single_quotes", false) ? "'" : "\"";
+
+	GDScriptParser parser;
+	GDScriptAnalyzer analyzer(&parser);
+
+	parser.parse(p_code, p_path, true);
+	analyzer.analyze();
+
+	r_forced = false;
+	Map<String, ScriptCodeCompletionOption> options;
+
+	GDScriptParser::CompletionContext completion_context = parser.get_completion_context();
+	completion_context.base = p_owner;
+	bool is_function = false;
+
+	switch (completion_context.type) {
+		case GDScriptParser::COMPLETION_NONE:
+			break;
+		case GDScriptParser::COMPLETION_ANNOTATION: {
+			List<MethodInfo> annotations;
+			parser.get_annotation_list(&annotations);
+			for (const List<MethodInfo>::Element *E = annotations.front(); E != nullptr; E = E->next()) {
+				ScriptCodeCompletionOption option(E->get().name.substr(1), ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+				if (E->get().arguments.size() > 0) {
+					option.insert_text += "(";
+				}
+				options.insert(option.display, option);
+			}
+			r_forced = true;
+		} break;
+		case GDScriptParser::COMPLETION_ANNOTATION_ARGUMENTS: {
+			if (completion_context.node == nullptr || completion_context.node->type != GDScriptParser::Node::ANNOTATION) {
+				break;
+			}
+			const GDScriptParser::AnnotationNode *annotation = static_cast<const GDScriptParser::AnnotationNode *>(completion_context.node);
+			_find_annotation_arguments(annotation, completion_context.current_argument, quote_style, options);
+			r_forced = true;
+		} break;
+		case GDScriptParser::COMPLETION_BUILT_IN_TYPE_CONSTANT: {
+			List<StringName> constants;
+			Variant::get_constants_for_type(completion_context.builtin_type, &constants);
+			for (const List<StringName>::Element *E = constants.front(); E != nullptr; E = E->next()) {
+				ScriptCodeCompletionOption option(E->get(), ScriptCodeCompletionOption::KIND_CONSTANT);
+				options.insert(option.display, option);
+			}
+		} break;
+		case GDScriptParser::COMPLETION_INHERIT_TYPE: {
+			_list_available_types(true, completion_context, options);
+			r_forced = true;
+		} break;
+		case GDScriptParser::COMPLETION_TYPE_NAME_OR_VOID: {
+			ScriptCodeCompletionOption option("void", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			options.insert(option.display, option);
+		}
+			[[fallthrough]];
+		case GDScriptParser::COMPLETION_TYPE_NAME: {
+			_list_available_types(false, completion_context, options);
+			r_forced = true;
+		} break;
+		case GDScriptParser::COMPLETION_PROPERTY_DECLARATION_OR_TYPE: {
+			_list_available_types(false, completion_context, options);
+			ScriptCodeCompletionOption get("get", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			options.insert(get.display, get);
+			ScriptCodeCompletionOption set("set", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			options.insert(set.display, set);
+			r_forced = true;
+		} break;
+		case GDScriptParser::COMPLETION_PROPERTY_DECLARATION: {
+			ScriptCodeCompletionOption get("get", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			options.insert(get.display, get);
+			ScriptCodeCompletionOption set("set", ScriptCodeCompletionOption::KIND_PLAIN_TEXT);
+			options.insert(set.display, set);
+			r_forced = true;
+		} break;
+		case GDScriptParser::COMPLETION_PROPERTY_METHOD: {
+			if (!completion_context.current_class) {
+				break;
+			}
+			for (int i = 0; i < completion_context.current_class->members.size(); i++) {
+				const GDScriptParser::ClassNode::Member &member = completion_context.current_class->members[i];
+				if (member.type != GDScriptParser::ClassNode::Member::FUNCTION) {
+					continue;
+				}
+				if (member.function->is_static) {
+					continue;
+				}
+				ScriptCodeCompletionOption option(member.function->identifier->name, ScriptCodeCompletionOption::KIND_FUNCTION);
+				options.insert(option.display, option);
+			}
+			r_forced = true;
+		} break;
+		case GDScriptParser::COMPLETION_ASSIGN: {
+			GDScriptCompletionIdentifier type;
+			if (!completion_context.node || completion_context.node->type != GDScriptParser::Node::ASSIGNMENT) {
+				break;
+			}
+			if (!_guess_expression_type(completion_context, static_cast<const GDScriptParser::AssignmentNode *>(completion_context.node)->assignee, type)) {
+				_find_identifiers(completion_context, false, options);
+				r_forced = true;
+				break;
+			}
+
+			if (!type.enumeration.empty()) {
+				_find_enumeration_candidates(completion_context, type.enumeration, options);
+				r_forced = options.size() > 0;
+			} else {
+				_find_identifiers(completion_context, false, options);
+				r_forced = true;
+			}
+		} break;
+		case GDScriptParser::COMPLETION_METHOD:
+			is_function = true;
+			[[fallthrough]];
+		case GDScriptParser::COMPLETION_IDENTIFIER: {
+			_find_identifiers(completion_context, is_function, options);
+		} break;
+		case GDScriptParser::COMPLETION_ATTRIBUTE_METHOD:
+			is_function = true;
+			[[fallthrough]];
+		case GDScriptParser::COMPLETION_ATTRIBUTE: {
+			r_forced = true;
+			const GDScriptParser::SubscriptNode *attr = static_cast<const GDScriptParser::SubscriptNode *>(completion_context.node);
+			if (attr->base) {
+				GDScriptCompletionIdentifier base;
+				if (!_guess_expression_type(completion_context, attr->base, base)) {
+					break;
+				}
+
+				_find_identifiers_in_base(base, is_function, options);
+			}
+		} break;
+		case GDScriptParser::COMPLETION_SUBSCRIPT: {
+			const GDScriptParser::SubscriptNode *subscript = static_cast<const GDScriptParser::SubscriptNode *>(completion_context.node);
+			GDScriptCompletionIdentifier base;
+			if (!_guess_expression_type(completion_context, subscript->base, base)) {
+				break;
+			}
+
+			GDScriptParser::CompletionContext c = completion_context;
+			c.current_function = nullptr;
+			c.current_suite = nullptr;
+			c.base = base.value.get_type() == Variant::OBJECT ? base.value.operator Object *() : nullptr;
+			if (base.type.kind == GDScriptParser::DataType::CLASS) {
+				c.current_class = base.type.class_type;
+			} else {
+				c.current_class = nullptr;
+			}
+
+			_find_identifiers_in_base(base, false, options);
+		} break;
+		case GDScriptParser::COMPLETION_TYPE_ATTRIBUTE: {
+			if (!completion_context.current_class) {
+				break;
+			}
+			const GDScriptParser::TypeNode *type = static_cast<const GDScriptParser::TypeNode *>(completion_context.node);
+			bool found = true;
+			GDScriptCompletionIdentifier base;
+			base.type.kind = GDScriptParser::DataType::CLASS;
+			base.type.type_source = GDScriptParser::DataType::INFERRED;
+			base.type.is_constant = true;
+			base.type.class_type = completion_context.current_class;
+			base.value = completion_context.base;
+
+			for (int i = 0; i < completion_context.current_argument; i++) {
+				GDScriptCompletionIdentifier ci;
+				if (!_guess_identifier_type_from_base(completion_context, base, type->type_chain[i]->name, ci)) {
+					found = false;
+					break;
+				}
+				base = ci;
+			}
+
+			// TODO: Improve this to only list types.
+			if (found) {
+				_find_identifiers_in_base(base, false, options);
+			}
+			r_forced = true;
+		} break;
+		case GDScriptParser::COMPLETION_RESOURCE_PATH: {
+			if (EditorSettings::get_singleton()->get("text_editor/completion/complete_file_paths")) {
+				_get_directory_contents(EditorFileSystem::get_singleton()->get_filesystem(), options);
+				r_forced = true;
+			}
+		} break;
+		case GDScriptParser::COMPLETION_CALL_ARGUMENTS: {
+			if (!completion_context.node) {
+				break;
+			}
+			_find_call_arguments(completion_context, completion_context.node, completion_context.current_argument, options, r_forced, r_call_hint);
+		} break;
+		case GDScriptParser::COMPLETION_OVERRIDE_METHOD: {
+			GDScriptParser::DataType native_type = completion_context.current_class->base_type;
+			while (native_type.is_set() && native_type.kind != GDScriptParser::DataType::NATIVE) {
+				switch (native_type.kind) {
+					case GDScriptParser::DataType::CLASS: {
+						native_type = native_type.class_type->base_type;
+					} break;
+					default: {
+						native_type.kind = GDScriptParser::DataType::UNRESOLVED;
+					} break;
+				}
+			}
+
+			if (!native_type.is_set()) {
+				break;
+			}
+
+			StringName class_name = _get_real_class_name(native_type.native_type);
+			if (!ClassDB::class_exists(class_name)) {
+				break;
+			}
+
+			bool use_type_hint = EditorSettings::get_singleton()->get_setting("text_editor/completion/add_type_hints").operator bool();
+
+			List<MethodInfo> virtual_methods;
+			ClassDB::get_virtual_methods(class_name, &virtual_methods);
+			for (List<MethodInfo>::Element *E = virtual_methods.front(); E; E = E->next()) {
+				MethodInfo &mi = E->get();
+				String method_hint = mi.name;
+				if (method_hint.find(":") != -1) {
+					method_hint = method_hint.get_slice(":", 0);
+				}
+				method_hint += "(";
+
+				if (mi.arguments.size()) {
+					for (int i = 0; i < mi.arguments.size(); i++) {
+						if (i > 0) {
+							method_hint += ", ";
+						}
+						String arg = mi.arguments[i].name;
+						if (arg.find(":") != -1) {
+							arg = arg.substr(0, arg.find(":"));
+						}
+						method_hint += arg;
+						if (use_type_hint && mi.arguments[i].type != Variant::NIL) {
+							method_hint += ": ";
+							if (mi.arguments[i].type == Variant::OBJECT && mi.arguments[i].class_name != StringName()) {
+								method_hint += mi.arguments[i].class_name.operator String();
+							} else {
+								method_hint += Variant::get_type_name(mi.arguments[i].type);
+							}
+						}
+					}
+				}
+				method_hint += ")";
+				if (use_type_hint && (mi.return_val.type != Variant::NIL || !(mi.return_val.usage & PROPERTY_USAGE_NIL_IS_VARIANT))) {
+					method_hint += " -> ";
+					if (mi.return_val.type == Variant::NIL) {
+						method_hint += "void";
+					} else if (mi.return_val.type == Variant::OBJECT && mi.return_val.class_name != StringName()) {
+						method_hint += mi.return_val.class_name.operator String();
+					} else {
+						method_hint += Variant::get_type_name(mi.return_val.type);
+					}
+				}
+				method_hint += ":";
+
+				ScriptCodeCompletionOption option(method_hint, ScriptCodeCompletionOption::KIND_FUNCTION);
+				options.insert(option.display, option);
+			}
+		} break;
+		case GDScriptParser::COMPLETION_GET_NODE: {
+			if (p_owner) {
+				List<String> opts;
+				p_owner->get_argument_options("get_node", 0, &opts);
+
+				for (List<String>::Element *E = opts.front(); E; E = E->next()) {
+					String opt = E->get().strip_edges();
+					if (opt.is_quoted()) {
+						r_forced = true;
+						String idopt = opt.unquote();
+						if (idopt.replace("/", "_").is_valid_identifier()) {
+							ScriptCodeCompletionOption option(idopt, ScriptCodeCompletionOption::KIND_NODE_PATH);
+							options.insert(option.display, option);
+						} else {
+							ScriptCodeCompletionOption option(opt, ScriptCodeCompletionOption::KIND_NODE_PATH);
+							options.insert(option.display, option);
+						}
+					}
+				}
+
+				// Get autoloads.
+				Map<StringName, ProjectSettings::AutoloadInfo> autoloads = ProjectSettings::get_singleton()->get_autoload_list();
+
+				for (Map<StringName, ProjectSettings::AutoloadInfo>::Element *E = autoloads.front(); E; E = E->next()) {
+					String name = E->key();
+					ScriptCodeCompletionOption option(quote_style + "/root/" + name + quote_style, ScriptCodeCompletionOption::KIND_NODE_PATH);
+					options.insert(option.display, option);
+				}
+			}
+		} break;
+		case GDScriptParser::COMPLETION_SUPER_METHOD: {
+			if (!completion_context.current_class) {
+				break;
+			}
+			_find_identifiers_in_class(completion_context.current_class, true, false, true, options);
+		} break;
+	}
+
+	for (Map<String, ScriptCodeCompletionOption>::Element *E = options.front(); E; E = E->next()) {
+		r_options->push_back(E->get());
+	}
+
+	return OK;
+}
+
+#else
+
 Error GDScriptLanguage::complete_code(const String &p_code, const String &p_path, Object *p_owner, List<ScriptCodeCompletionOption> *r_options, bool &r_forced, String &r_call_hint) {
 	return OK;
 }
 
+#endif
+
 //////// END COMPLETION //////////
 
 String GDScriptLanguage::_get_indentation() const {
@@ -559,8 +2750,360 @@ void GDScriptLanguage::auto_indent_code(String &p_code, int p_from_line, int p_t
 
 #ifdef TOOLS_ENABLED
 
+static Error _lookup_symbol_from_base(const GDScriptParser::DataType &p_base, const String &p_symbol, bool p_is_function, GDScriptLanguage::LookupResult &r_result) {
+	GDScriptParser::DataType base_type = p_base;
+
+	while (base_type.is_set()) {
+		switch (base_type.kind) {
+			case GDScriptParser::DataType::CLASS: {
+				if (base_type.class_type) {
+					if (base_type.class_type->has_member(p_symbol)) {
+						r_result.type = ScriptLanguage::LookupResult::RESULT_SCRIPT_LOCATION;
+						r_result.location = base_type.class_type->get_member(p_symbol).get_line();
+					}
+					base_type = base_type.class_type->base_type;
+				}
+			} break;
+			case GDScriptParser::DataType::SCRIPT: {
+				Ref<Script> scr = base_type.script_type;
+				if (scr.is_valid()) {
+					int line = scr->get_member_line(p_symbol);
+					if (line >= 0) {
+						r_result.type = ScriptLanguage::LookupResult::RESULT_SCRIPT_LOCATION;
+						r_result.location = line;
+						r_result.script = scr;
+						return OK;
+					}
+					Ref<Script> base_script = scr->get_base_script();
+					if (base_script.is_valid()) {
+						base_type.script_type = base_script;
+					} else {
+						base_type.kind = GDScriptParser::DataType::NATIVE;
+						base_type.native_type = scr->get_instance_base_type();
+					}
+				} else {
+					base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+				}
+			} break;
+			case GDScriptParser::DataType::NATIVE: {
+				StringName class_name = _get_real_class_name(base_type.native_type);
+				if (!ClassDB::class_exists(class_name)) {
+					base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+					break;
+				}
+
+				if (ClassDB::has_method(class_name, p_symbol, true)) {
+					r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_METHOD;
+					r_result.class_name = base_type.native_type;
+					r_result.class_member = p_symbol;
+					return OK;
+				}
+
+				List<MethodInfo> virtual_methods;
+				ClassDB::get_virtual_methods(class_name, &virtual_methods, true);
+				for (List<MethodInfo>::Element *E = virtual_methods.front(); E; E = E->next()) {
+					if (E->get().name == p_symbol) {
+						r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_METHOD;
+						r_result.class_name = base_type.native_type;
+						r_result.class_member = p_symbol;
+						return OK;
+					}
+				}
+
+				StringName enum_name = ClassDB::get_integer_constant_enum(class_name, p_symbol, true);
+				if (enum_name != StringName()) {
+					r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_ENUM;
+					r_result.class_name = base_type.native_type;
+					r_result.class_member = enum_name;
+					return OK;
+				}
+
+				List<String> constants;
+				ClassDB::get_integer_constant_list(class_name, &constants, true);
+				for (List<String>::Element *E = constants.front(); E; E = E->next()) {
+					if (E->get() == p_symbol) {
+						r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_CONSTANT;
+						r_result.class_name = base_type.native_type;
+						r_result.class_member = p_symbol;
+						return OK;
+					}
+				}
+
+				if (ClassDB::has_property(class_name, p_symbol, true)) {
+					r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_PROPERTY;
+					r_result.class_name = base_type.native_type;
+					r_result.class_member = p_symbol;
+					return OK;
+				}
+
+				StringName parent = ClassDB::get_parent_class(class_name);
+				if (parent != StringName()) {
+					if (String(parent).begins_with("_")) {
+						base_type.native_type = String(parent).right(1);
+					} else {
+						base_type.native_type = parent;
+					}
+				} else {
+					base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+				}
+			} break;
+			case GDScriptParser::DataType::BUILTIN: {
+				base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+
+				if (Variant::has_constant(base_type.builtin_type, p_symbol)) {
+					r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_CONSTANT;
+					r_result.class_name = Variant::get_type_name(base_type.builtin_type);
+					r_result.class_member = p_symbol;
+					return OK;
+				}
+
+				Variant v;
+				REF v_ref;
+				if (base_type.builtin_type == Variant::OBJECT) {
+					v_ref.instance();
+					v = v_ref;
+				} else {
+					Callable::CallError err;
+					v = Variant::construct(base_type.builtin_type, NULL, 0, err);
+					if (err.error != Callable::CallError::CALL_OK) {
+						break;
+					}
+				}
+
+				if (v.has_method(p_symbol)) {
+					r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_METHOD;
+					r_result.class_name = Variant::get_type_name(base_type.builtin_type);
+					r_result.class_member = p_symbol;
+					return OK;
+				}
+
+				bool valid = false;
+				v.get(p_symbol, &valid);
+				if (valid) {
+					r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_PROPERTY;
+					r_result.class_name = Variant::get_type_name(base_type.builtin_type);
+					r_result.class_member = p_symbol;
+					return OK;
+				}
+			} break;
+			default: {
+				base_type.kind = GDScriptParser::DataType::UNRESOLVED;
+			} break;
+		}
+	}
+
+	return ERR_CANT_RESOLVE;
+}
+
 Error GDScriptLanguage::lookup_code(const String &p_code, const String &p_symbol, const String &p_path, Object *p_owner, LookupResult &r_result) {
-	// FIXME: Implement lookup.
+	//before parsing, try the usual stuff
+	if (ClassDB::class_exists(p_symbol)) {
+		r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS;
+		r_result.class_name = p_symbol;
+		return OK;
+	} else {
+		String under_prefix = "_" + p_symbol;
+		if (ClassDB::class_exists(under_prefix)) {
+			r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS;
+			r_result.class_name = p_symbol;
+			return OK;
+		}
+	}
+
+	for (int i = 0; i < Variant::VARIANT_MAX; i++) {
+		Variant::Type t = Variant::Type(i);
+		if (Variant::get_type_name(t) == p_symbol) {
+			r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS;
+			r_result.class_name = Variant::get_type_name(t);
+			return OK;
+		}
+	}
+
+	for (int i = 0; i < GDScriptFunctions::FUNC_MAX; i++) {
+		if (GDScriptFunctions::get_func_name(GDScriptFunctions::Function(i)) == p_symbol) {
+			r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_METHOD;
+			r_result.class_name = "@GDScript";
+			r_result.class_member = p_symbol;
+			return OK;
+		}
+	}
+
+	if ("PI" == p_symbol || "TAU" == p_symbol || "INF" == p_symbol || "NAN" == p_symbol) {
+		r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_CONSTANT;
+		r_result.class_name = "@GDScript";
+		r_result.class_member = p_symbol;
+		return OK;
+	}
+
+	GDScriptParser parser;
+	parser.parse(p_code, p_path, true);
+	GDScriptAnalyzer analyzer(&parser);
+	analyzer.analyze();
+
+	GDScriptParser::CompletionContext context = parser.get_completion_context();
+
+	if (context.current_class && context.current_class->extends.size() > 0) {
+		bool success = false;
+		ClassDB::get_integer_constant(context.current_class->extends[0], p_symbol, &success);
+		if (success) {
+			r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_CONSTANT;
+			r_result.class_name = context.current_class->extends[0];
+			r_result.class_member = p_symbol;
+			return OK;
+		}
+	}
+
+	bool is_function = false;
+
+	switch (context.type) {
+		case GDScriptParser::COMPLETION_BUILT_IN_TYPE_CONSTANT: {
+			r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_CONSTANT;
+			r_result.class_name = Variant::get_type_name(context.builtin_type);
+			r_result.class_member = p_symbol;
+			return OK;
+		} break;
+		case GDScriptParser::COMPLETION_SUPER_METHOD:
+		case GDScriptParser::COMPLETION_METHOD: {
+			is_function = true;
+			[[fallthrough]];
+		}
+		case GDScriptParser::COMPLETION_IDENTIFIER: {
+			GDScriptParser::DataType base_type;
+			if (context.current_class) {
+				if (context.type != GDScriptParser::COMPLETION_SUPER_METHOD) {
+					base_type = context.current_class->get_datatype();
+				} else {
+					base_type = context.current_class->base_type;
+				}
+			} else {
+				break;
+			}
+
+			if (!is_function && context.current_suite) {
+				// Lookup local variables.
+				const GDScriptParser::SuiteNode *suite = context.current_suite;
+				while (suite) {
+					if (suite->has_local(p_symbol)) {
+						r_result.type = ScriptLanguage::LookupResult::RESULT_SCRIPT_LOCATION;
+						r_result.location = suite->get_local(p_symbol).start_line;
+						return OK;
+					}
+					suite = suite->parent_block;
+				}
+			}
+
+			if (_lookup_symbol_from_base(base_type, p_symbol, is_function, r_result) == OK) {
+				return OK;
+			}
+
+			if (!is_function) {
+				// Guess in autoloads as singletons.
+				if (ProjectSettings::get_singleton()->has_autoload(p_symbol)) {
+					const ProjectSettings::AutoloadInfo &singleton = ProjectSettings::get_singleton()->get_autoload(p_symbol);
+					if (singleton.is_singleton) {
+						String script = singleton.path;
+						if (!script.ends_with(".gd")) {
+							// Not a script, try find the script anyway,
+							// may have some success.
+							script = script.get_basename() + ".gd";
+						}
+
+						if (FileAccess::exists(script)) {
+							r_result.type = ScriptLanguage::LookupResult::RESULT_SCRIPT_LOCATION;
+							r_result.location = 0;
+							r_result.script = ResourceLoader::load(script);
+							return OK;
+						}
+					}
+				}
+
+				// Global.
+				Map<StringName, int> classes = GDScriptLanguage::get_singleton()->get_global_map();
+				if (classes.has(p_symbol)) {
+					Variant value = GDScriptLanguage::get_singleton()->get_global_array()[classes[p_symbol]];
+					if (value.get_type() == Variant::OBJECT) {
+						Object *obj = value;
+						if (obj) {
+							if (Object::cast_to<GDScriptNativeClass>(obj)) {
+								r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS;
+								r_result.class_name = Object::cast_to<GDScriptNativeClass>(obj)->get_name();
+							} else {
+								r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS;
+								r_result.class_name = obj->get_class();
+							}
+
+							// proxy class remove the underscore.
+							if (r_result.class_name.begins_with("_")) {
+								r_result.class_name = r_result.class_name.right(1);
+							}
+							return OK;
+						}
+					} else {
+						/*
+						// Because get_integer_constant_enum and get_integer_constant don't work on @GlobalScope
+						// We cannot determine the exact nature of the identifier here
+						// Otherwise these codes would work
+						StringName enumName = ClassDB::get_integer_constant_enum("@GlobalScope", p_symbol, true);
+						if (enumName != NULL) {
+							r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_ENUM;
+							r_result.class_name = "@GlobalScope";
+							r_result.class_member = enumName;
+							return OK;
+						}
+						else {
+							r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_CONSTANT;
+							r_result.class_name = "@GlobalScope";
+							r_result.class_member = p_symbol;
+							return OK;
+						}*/
+						r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_TBD_GLOBALSCOPE;
+						r_result.class_name = "@GlobalScope";
+						r_result.class_member = p_symbol;
+						return OK;
+					}
+				}
+			}
+		} break;
+		case GDScriptParser::COMPLETION_ATTRIBUTE_METHOD: {
+			is_function = true;
+			[[fallthrough]];
+		}
+		case GDScriptParser::COMPLETION_ATTRIBUTE: {
+			if (context.node->type != GDScriptParser::Node::SUBSCRIPT) {
+				break;
+			}
+			const GDScriptParser::SubscriptNode *subscript = static_cast<const GDScriptParser::SubscriptNode *>(context.node);
+			if (!subscript->is_attribute) {
+				break;
+			}
+			GDScriptCompletionIdentifier base;
+			if (!_guess_expression_type(context, subscript->base, base)) {
+				break;
+			}
+
+			if (_lookup_symbol_from_base(base.type, p_symbol, is_function, r_result) == OK) {
+				return OK;
+			}
+		} break;
+		case GDScriptParser::COMPLETION_OVERRIDE_METHOD: {
+			GDScriptParser::DataType base_type = context.current_class->base_type;
+
+			if (_lookup_symbol_from_base(base_type, p_symbol, true, r_result) == OK) {
+				return OK;
+			}
+		} break;
+		case GDScriptParser::COMPLETION_TYPE_NAME_OR_VOID:
+		case GDScriptParser::COMPLETION_TYPE_NAME: {
+			GDScriptParser::DataType base_type = context.current_class->get_datatype();
+
+			if (_lookup_symbol_from_base(base_type, p_symbol, false, r_result) == OK) {
+				return OK;
+			}
+		} break;
+		default: {
+		}
+	}
+
 	return ERR_CANT_RESOLVE;
 }
 
diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index d6867f1f87..d25a8688be 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -41,6 +41,10 @@
 #include "core/string_builder.h"
 #endif // DEBUG_ENABLED
 
+#ifdef TOOLS_ENABLED
+#include "editor/editor_settings.h"
+#endif // TOOLS_ENABLED
+
 static HashMap<StringName, Variant::Type> builtin_types;
 Variant::Type GDScriptParser::get_builtin_type(const StringName &p_type) {
 	if (builtin_types.empty()) {
@@ -99,6 +103,14 @@ GDScriptFunctions::Function GDScriptParser::get_builtin_function(const StringNam
 	return GDScriptFunctions::FUNC_MAX;
 }
 
+void GDScriptParser::get_annotation_list(List<MethodInfo> *r_annotations) const {
+	List<StringName> keys;
+	valid_annotations.get_key_list(&keys);
+	for (const List<StringName>::Element *E = keys.front(); E != nullptr; E = E->next()) {
+		r_annotations->push_back(valid_annotations[E->get()].info);
+	}
+}
+
 GDScriptParser::GDScriptParser() {
 	// Register valid annotations.
 	// TODO: Should this be static?
@@ -239,9 +251,114 @@ void GDScriptParser::push_warning(const Node *p_source, GDScriptWarning::Code p_
 	}
 }
 
+void GDScriptParser::make_completion_context(CompletionType p_type, Node *p_node, int p_argument, bool p_force) {
+	if (!for_completion || (!p_force && completion_context.type != COMPLETION_NONE)) {
+		return;
+	}
+	if (previous.cursor_place != GDScriptTokenizer::CURSOR_MIDDLE && previous.cursor_place != GDScriptTokenizer::CURSOR_END && current.cursor_place == GDScriptTokenizer::CURSOR_NONE) {
+		return;
+	}
+	CompletionContext context;
+	context.type = p_type;
+	context.current_class = current_class;
+	context.current_function = current_function;
+	context.current_suite = current_suite;
+	context.current_line = tokenizer.get_cursor_line();
+	context.current_argument = p_argument;
+	context.node = p_node;
+	completion_context = context;
+}
+
+void GDScriptParser::make_completion_context(CompletionType p_type, Variant::Type p_builtin_type, bool p_force) {
+	if (!for_completion || (!p_force && completion_context.type != COMPLETION_NONE)) {
+		return;
+	}
+	if (previous.cursor_place != GDScriptTokenizer::CURSOR_MIDDLE && previous.cursor_place != GDScriptTokenizer::CURSOR_END && current.cursor_place == GDScriptTokenizer::CURSOR_NONE) {
+		return;
+	}
+	CompletionContext context;
+	context.type = p_type;
+	context.current_class = current_class;
+	context.current_function = current_function;
+	context.current_suite = current_suite;
+	context.current_line = tokenizer.get_cursor_line();
+	context.builtin_type = p_builtin_type;
+	completion_context = context;
+}
+
+void GDScriptParser::push_completion_call(Node *p_call) {
+	if (!for_completion) {
+		return;
+	}
+	CompletionCall call;
+	call.call = p_call;
+	call.argument = 0;
+	completion_call_stack.push_back(call);
+	if (previous.cursor_place == GDScriptTokenizer::CURSOR_MIDDLE || previous.cursor_place == GDScriptTokenizer::CURSOR_END || current.cursor_place == GDScriptTokenizer::CURSOR_BEGINNING) {
+		completion_call = call;
+	}
+}
+
+void GDScriptParser::pop_completion_call() {
+	if (!for_completion) {
+		return;
+	}
+	ERR_FAIL_COND_MSG(completion_call_stack.empty(), "Trying to pop empty completion call stack");
+	completion_call_stack.pop_back();
+}
+
+void GDScriptParser::set_last_completion_call_arg(int p_argument) {
+	if (!for_completion || passed_cursor) {
+		return;
+	}
+	ERR_FAIL_COND_MSG(completion_call_stack.empty(), "Trying to set argument on empty completion call stack");
+	completion_call_stack.back()->get().argument = p_argument;
+}
+
 Error GDScriptParser::parse(const String &p_source_code, const String &p_script_path, bool p_for_completion) {
 	clear();
-	tokenizer.set_source_code(p_source_code);
+
+	String source = p_source_code;
+	int cursor_line = -1;
+	int cursor_column = -1;
+	for_completion = p_for_completion;
+
+	int tab_size = 4;
+#ifdef TOOLS_ENABLED
+	if (EditorSettings::get_singleton()) {
+		tab_size = EditorSettings::get_singleton()->get_setting("text_editor/indent/size");
+	}
+#endif // TOOLS_ENABLED
+
+	if (p_for_completion) {
+		// Remove cursor sentinel char.
+		const Vector<String> lines = p_source_code.split("\n");
+		cursor_line = 1;
+		cursor_column = 1;
+		for (int i = 0; i < lines.size(); i++) {
+			bool found = false;
+			const String &line = lines[i];
+			for (int j = 0; j < line.size(); j++) {
+				if (line[j] == CharType(0xFFFF)) {
+					found = true;
+					break;
+				} else if (line[j] == '\t') {
+					cursor_column += tab_size - 1;
+				}
+				cursor_column++;
+			}
+			if (found) {
+				break;
+			}
+			cursor_line++;
+			cursor_column = 1;
+		}
+
+		source = source.replace_first(String::chr(0xFFFF), String());
+	}
+
+	tokenizer.set_source_code(source);
+	tokenizer.set_cursor_position(cursor_line, cursor_column);
 	script_path = p_script_path;
 	current = tokenizer.scan();
 	// Avoid error as the first token.
@@ -271,6 +388,12 @@ GDScriptTokenizer::Token GDScriptParser::advance() {
 	if (current.type == GDScriptTokenizer::Token::TK_EOF) {
 		ERR_FAIL_COND_V_MSG(current.type == GDScriptTokenizer::Token::TK_EOF, current, "GDScript parser bug: Trying to advance past the end of stream.");
 	}
+	if (for_completion && !completion_call_stack.empty()) {
+		if (completion_call.call == nullptr && tokenizer.is_past_cursor()) {
+			completion_call = completion_call_stack.back()->get();
+			passed_cursor = true;
+		}
+	}
 	previous = current;
 	current = tokenizer.scan();
 	while (current.type == GDScriptTokenizer::Token::ERROR) {
@@ -513,6 +636,8 @@ void GDScriptParser::parse_class_name() {
 void GDScriptParser::parse_extends() {
 	current_class->extends_used = true;
 
+	int chain_index = 0;
+
 	if (match(GDScriptTokenizer::Token::LITERAL)) {
 		if (previous.literal.get_type() != Variant::STRING) {
 			push_error(vformat(R"(Only strings or identifiers can be used after "extends", found "%s" instead.)", Variant::get_type_name(previous.literal.get_type())));
@@ -525,12 +650,15 @@ void GDScriptParser::parse_extends() {
 		}
 	}
 
+	make_completion_context(COMPLETION_INHERIT_TYPE, current_class, chain_index++);
+
 	if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected superclass name after "extends".)")) {
 		return;
 	}
 	current_class->extends.push_back(previous.literal);
 
 	while (match(GDScriptTokenizer::Token::PERIOD)) {
+		make_completion_context(COMPLETION_INHERIT_TYPE, current_class, chain_index++);
 		if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected superclass name after ".".)")) {
 			return;
 		}
@@ -645,10 +773,13 @@ GDScriptParser::VariableNode *GDScriptParser::parse_variable(bool p_allow_proper
 			// Infer type.
 			variable->infer_datatype = true;
 		} else {
-			if (p_allow_property && check(GDScriptTokenizer::Token::IDENTIFIER)) {
-				// Check if get or set.
-				if (current.get_identifier() == "get" || current.get_identifier() == "set") {
-					return parse_property(variable, false);
+			if (p_allow_property) {
+				make_completion_context(COMPLETION_PROPERTY_DECLARATION_OR_TYPE, variable);
+				if (check(GDScriptTokenizer::Token::IDENTIFIER)) {
+					// Check if get or set.
+					if (current.get_identifier() == "get" || current.get_identifier() == "set") {
+						return parse_property(variable, false);
+					}
 				}
 			}
 
@@ -685,12 +816,14 @@ GDScriptParser::VariableNode *GDScriptParser::parse_property(VariableNode *p_var
 		}
 	}
 
+	VariableNode *property = p_variable;
+
+	make_completion_context(COMPLETION_PROPERTY_DECLARATION, property);
+
 	if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected "get" or "set" for property declaration.)")) {
 		return nullptr;
 	}
 
-	VariableNode *property = p_variable;
-
 	IdentifierNode *function = parse_identifier();
 
 	if (check(GDScriptTokenizer::Token::EQUAL)) {
@@ -770,6 +903,7 @@ void GDScriptParser::parse_property_setter(VariableNode *p_variable) {
 
 		case VariableNode::PROP_SETGET:
 			consume(GDScriptTokenizer::Token::EQUAL, R"(Expected "=" after "set")");
+			make_completion_context(COMPLETION_PROPERTY_METHOD, p_variable);
 			if (consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected setter function name after "=".)")) {
 				p_variable->setter_pointer = parse_identifier();
 			}
@@ -788,6 +922,7 @@ void GDScriptParser::parse_property_getter(VariableNode *p_variable) {
 			break;
 		case VariableNode::PROP_SETGET:
 			consume(GDScriptTokenizer::Token::EQUAL, R"(Expected "=" after "get")");
+			make_completion_context(COMPLETION_PROPERTY_METHOD, p_variable);
 			if (consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected getter function name after "=".)")) {
 				p_variable->getter_pointer = parse_identifier();
 			}
@@ -844,6 +979,7 @@ GDScriptParser::ParameterNode *GDScriptParser::parse_parameter() {
 			parameter->infer_datatype = true;
 		} else {
 			// Parse type.
+			make_completion_context(COMPLETION_TYPE_NAME, parameter);
 			parameter->datatype_specifier = parse_type();
 		}
 	}
@@ -964,11 +1100,13 @@ GDScriptParser::FunctionNode *GDScriptParser::parse_function() {
 		_static = true;
 	}
 
+	FunctionNode *function = alloc_node<FunctionNode>();
+	make_completion_context(COMPLETION_OVERRIDE_METHOD, function);
+
 	if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected function name after "func".)")) {
 		return nullptr;
 	}
 
-	FunctionNode *function = alloc_node<FunctionNode>();
 	FunctionNode *previous_function = current_function;
 	current_function = function;
 
@@ -1015,6 +1153,7 @@ GDScriptParser::FunctionNode *GDScriptParser::parse_function() {
 	consume(GDScriptTokenizer::Token::PARENTHESIS_CLOSE, R"*(Expected closing ")" after function parameters.)*");
 
 	if (match(GDScriptTokenizer::Token::FORWARD_ARROW)) {
+		make_completion_context(COMPLETION_TYPE_NAME_OR_VOID, function);
 		function->return_type = parse_type(true);
 	}
 
@@ -1033,6 +1172,8 @@ GDScriptParser::AnnotationNode *GDScriptParser::parse_annotation(uint32_t p_vali
 
 	annotation->name = previous.literal;
 
+	make_completion_context(COMPLETION_ANNOTATION, annotation);
+
 	bool valid = true;
 
 	if (!valid_annotations.has(annotation->name)) {
@@ -1049,8 +1190,13 @@ GDScriptParser::AnnotationNode *GDScriptParser::parse_annotation(uint32_t p_vali
 
 	if (match(GDScriptTokenizer::Token::PARENTHESIS_OPEN)) {
 		// Arguments.
+		push_completion_call(annotation);
+		make_completion_context(COMPLETION_ANNOTATION_ARGUMENTS, annotation, 0, true);
 		if (!check(GDScriptTokenizer::Token::PARENTHESIS_CLOSE) && !is_at_end()) {
+			int argument = 0;
 			do {
+				make_completion_context(COMPLETION_ANNOTATION_ARGUMENTS, annotation, argument, true);
+				set_last_completion_call_arg(argument++, true);
 				ExpressionNode *argument = parse_expression(false);
 				if (argument == nullptr) {
 					valid = false;
@@ -1061,6 +1207,7 @@ GDScriptParser::AnnotationNode *GDScriptParser::parse_annotation(uint32_t p_vali
 
 			consume(GDScriptTokenizer::Token::PARENTHESIS_CLOSE, R"*(Expected ")" after annotation arguments.)*");
 		}
+		pop_completion_call();
 	}
 
 	match(GDScriptTokenizer::Token::NEWLINE); // Newline after annotation is optional.
@@ -1075,7 +1222,7 @@ GDScriptParser::AnnotationNode *GDScriptParser::parse_annotation(uint32_t p_vali
 void GDScriptParser::clear_unused_annotations() {
 	for (const List<AnnotationNode *>::Element *E = annotation_stack.front(); E != nullptr; E = E->next()) {
 		AnnotationNode *annotation = E->get();
-		push_error(vformat(R"(Annotation "%s" does not precedes a valid target, so it will have no effect.)", annotation->name));
+		push_error(vformat(R"(Annotation "%s" does not precedes a valid target, so it will have no effect.)", annotation->name), annotation);
 	}
 
 	annotation_stack.clear();
@@ -1342,6 +1489,7 @@ GDScriptParser::ForNode *GDScriptParser::parse_for() {
 
 	SuiteNode *suite = alloc_node<SuiteNode>();
 	suite->add_local(SuiteNode::Local(n_for->variable));
+	suite->parent_for = n_for;
 
 	n_for->loop = parse_suite(R"("for" block)", suite);
 
@@ -1363,6 +1511,7 @@ GDScriptParser::IfNode *GDScriptParser::parse_if(const String &p_token) {
 	consume(GDScriptTokenizer::Token::COLON, vformat(R"(Expected ":" after "%s" condition.)", p_token));
 
 	n_if->true_block = parse_suite(vformat(R"("%s" block)", p_token));
+	n_if->true_block->parent_if = n_if;
 
 	if (n_if->true_block->has_continue) {
 		current_suite->has_continue = true;
@@ -1722,6 +1871,8 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_identifier(ExpressionNode
 	IdentifierNode *identifier = alloc_node<IdentifierNode>();
 	identifier->name = previous.get_identifier();
 
+	make_completion_context(COMPLETION_IDENTIFIER, identifier);
+
 	if (current_suite != nullptr && current_suite->has_local(identifier->name)) {
 		const SuiteNode::Local &declaration = current_suite->get_local(identifier->name);
 		switch (declaration.type) {
@@ -2000,6 +2151,7 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_assignment(ExpressionNode
 	}
 
 	AssignmentNode *assignment = alloc_node<AssignmentNode>();
+	make_completion_context(COMPLETION_ASSIGN, assignment);
 	bool has_operator = true;
 	switch (previous.type) {
 		case GDScriptTokenizer::Token::EQUAL:
@@ -2168,11 +2320,26 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_grouping(ExpressionNode *p
 GDScriptParser::ExpressionNode *GDScriptParser::parse_attribute(ExpressionNode *p_previous_operand, bool p_can_assign) {
 	SubscriptNode *attribute = alloc_node<SubscriptNode>();
 
+	if (for_completion) {
+		bool is_builtin = false;
+		if (p_previous_operand->type == Node::IDENTIFIER) {
+			const IdentifierNode *id = static_cast<const IdentifierNode *>(p_previous_operand);
+			Variant::Type builtin_type = get_builtin_type(id->name);
+			if (builtin_type < Variant::VARIANT_MAX) {
+				make_completion_context(COMPLETION_BUILT_IN_TYPE_CONSTANT, builtin_type, true);
+				is_builtin = true;
+			}
+		}
+		if (!is_builtin) {
+			make_completion_context(COMPLETION_ATTRIBUTE, attribute, -1, true);
+		}
+	}
+
 	attribute->is_attribute = true;
 	attribute->base = p_previous_operand;
 
 	if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected identifier after "." for attribute access.)")) {
-		return nullptr;
+		return attribute;
 	}
 	attribute->attribute = parse_identifier();
 
@@ -2182,6 +2349,8 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_attribute(ExpressionNode *
 GDScriptParser::ExpressionNode *GDScriptParser::parse_subscript(ExpressionNode *p_previous_operand, bool p_can_assign) {
 	SubscriptNode *subscript = alloc_node<SubscriptNode>();
 
+	make_completion_context(COMPLETION_SUBSCRIPT, subscript);
+
 	subscript->base = p_previous_operand;
 	subscript->index = parse_expression(false);
 
@@ -2222,6 +2391,7 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_call(ExpressionNode *p_pre
 			call->function_name = current_function->identifier->name;
 		} else {
 			consume(GDScriptTokenizer::Token::PERIOD, R"(Expected "." or "(" after "super".)");
+			make_completion_context(COMPLETION_SUPER_METHOD, call);
 			if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected function name after ".".)")) {
 				pop_multiline();
 				return nullptr;
@@ -2251,7 +2421,11 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_call(ExpressionNode *p_pre
 
 	if (!check(GDScriptTokenizer::Token::PARENTHESIS_CLOSE)) {
 		// Arguments.
+		push_completion_call(call);
+		make_completion_context(COMPLETION_CALL_ARGUMENTS, call, 0);
+		int argument = 0;
 		do {
+			make_completion_context(COMPLETION_CALL_ARGUMENTS, call, argument++);
 			if (check(GDScriptTokenizer::Token::PARENTHESIS_CLOSE)) {
 				// Allow for trailing comma.
 				break;
@@ -2263,6 +2437,7 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_call(ExpressionNode *p_pre
 				call->arguments.push_back(argument);
 			}
 		} while (match(GDScriptTokenizer::Token::COMMA));
+		pop_completion_call();
 	}
 
 	pop_multiline();
@@ -2278,11 +2453,14 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_get_node(ExpressionNode *p
 			return nullptr;
 		}
 		GetNodeNode *get_node = alloc_node<GetNodeNode>();
+		make_completion_context(COMPLETION_GET_NODE, get_node);
 		get_node->string = parse_literal();
 		return get_node;
 	} else if (check(GDScriptTokenizer::Token::IDENTIFIER)) {
 		GetNodeNode *get_node = alloc_node<GetNodeNode>();
+		int chain_position = 0;
 		do {
+			make_completion_context(COMPLETION_GET_NODE, get_node, chain_position++);
 			if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expect node identifer after "/".)")) {
 				return nullptr;
 			}
@@ -2303,6 +2481,9 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_preload(ExpressionNode *p_
 	push_multiline(true);
 	consume(GDScriptTokenizer::Token::PARENTHESIS_OPEN, R"(Expected "(" after "preload".)");
 
+	make_completion_context(COMPLETION_RESOURCE_PATH, preload);
+	push_completion_call(preload);
+
 	preload->path = parse_expression(false);
 
 	if (preload->path == nullptr) {
@@ -2332,6 +2513,8 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_preload(ExpressionNode *p_
 		}
 	}
 
+	pop_completion_call();
+
 	pop_multiline();
 	consume(GDScriptTokenizer::Token::PARENTHESIS_CLOSE, R"*(Expected ")" after preload path.)*");
 
@@ -2355,6 +2538,8 @@ GDScriptParser::ExpressionNode *GDScriptParser::parse_invalid_token(ExpressionNo
 }
 
 GDScriptParser::TypeNode *GDScriptParser::parse_type(bool p_allow_void) {
+	TypeNode *type = alloc_node<TypeNode>();
+	make_completion_context(p_allow_void ? COMPLETION_TYPE_NAME_OR_VOID : COMPLETION_TYPE_NAME, type);
 	if (!match(GDScriptTokenizer::Token::IDENTIFIER)) {
 		if (match(GDScriptTokenizer::Token::VOID)) {
 			if (p_allow_void) {
@@ -2368,12 +2553,13 @@ GDScriptParser::TypeNode *GDScriptParser::parse_type(bool p_allow_void) {
 		return nullptr;
 	}
 
-	TypeNode *type = alloc_node<TypeNode>();
 	IdentifierNode *type_element = parse_identifier();
 
 	type->type_chain.push_back(type_element);
 
+	int chain_index = 1;
 	while (match(GDScriptTokenizer::Token::PERIOD)) {
+		make_completion_context(COMPLETION_TYPE_ATTRIBUTE, type, chain_index++);
 		if (consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected inner type name after ".".)")) {
 			type_element = parse_identifier();
 			type->type_chain.push_back(type_element);
diff --git a/modules/gdscript/gdscript_parser.h b/modules/gdscript/gdscript_parser.h
index fa7a529c08..4c695d62f7 100644
--- a/modules/gdscript/gdscript_parser.h
+++ b/modules/gdscript/gdscript_parser.h
@@ -565,6 +565,9 @@ public:
 		bool has_member(const StringName &p_name) const {
 			return members_indices.has(p_name);
 		}
+		bool has_function(const StringName &p_name) const {
+			return has_member(p_name) && members[members_indices[p_name]].type == Member::FUNCTION;
+		}
 		template <class T>
 		void add_member(T *p_member_node) {
 			members_indices[p_member_node->identifier->name] = members.size();
@@ -908,7 +911,6 @@ public:
 		FunctionNode *parent_function = nullptr;
 		ForNode *parent_for = nullptr;
 		IfNode *parent_if = nullptr;
-		PatternNode *parent_pattern = nullptr;
 
 		bool has_return = false;
 		bool has_continue = false;
@@ -1011,6 +1013,47 @@ public:
 		}
 	};
 
+	enum CompletionType {
+		COMPLETION_NONE,
+		COMPLETION_ANNOTATION, // Annotation (following @).
+		COMPLETION_ANNOTATION_ARGUMENTS, // Annotation arguments hint.
+		COMPLETION_ASSIGN, // Assignment based on type (e.g. enum values).
+		COMPLETION_ATTRIBUTE, // After id.| to look for members.
+		COMPLETION_BUILT_IN_TYPE_CONSTANT, // Constants inside a built-in type (e.g. Color.blue).
+		COMPLETION_CALL_ARGUMENTS, // Complete with nodes, input actions, enum values (or usual expressions).
+		// TODO: COMPLETION_DECLARATION, // Potential declaration (var, const, func).
+		COMPLETION_GET_NODE, // Get node with $ notation.
+		COMPLETION_IDENTIFIER, // List available identifiers in scope.
+		COMPLETION_INHERIT_TYPE, // Type after extends. Exclude non-viable types (built-ins, enums, void). Includes subtypes using the argument index.
+		COMPLETION_OVERRIDE_METHOD, // Override implementation, also for native virtuals.
+		COMPLETION_PROPERTY_DECLARATION, // Property declaration (get, set).
+		COMPLETION_PROPERTY_DECLARATION_OR_TYPE, // Property declaration (get, set) or a type hint.
+		COMPLETION_PROPERTY_METHOD, // Property setter or getter (list available methods).
+		COMPLETION_RESOURCE_PATH, // For load/preload.
+		COMPLETION_SUBSCRIPT, // Inside id[|].
+		COMPLETION_SUPER_METHOD, // After super.
+		COMPLETION_TYPE_ATTRIBUTE, // Attribute in type name (Type.|).
+		COMPLETION_TYPE_NAME, // Name of type (after :).
+		COMPLETION_TYPE_NAME_OR_VOID, // Same as TYPE_NAME, but allows void (in function return type).
+	};
+
+	struct CompletionContext {
+		CompletionType type = COMPLETION_NONE;
+		ClassNode *current_class = nullptr;
+		FunctionNode *current_function = nullptr;
+		SuiteNode *current_suite = nullptr;
+		int current_line = -1;
+		int current_argument = -1;
+		Variant::Type builtin_type = Variant::VARIANT_MAX;
+		Node *node = nullptr;
+		Object *base = nullptr;
+	};
+
+	struct CompletionCall {
+		Node *call = nullptr;
+		int argument = -1;
+	};
+
 private:
 	friend class GDScriptAnalyzer;
 
@@ -1038,6 +1081,11 @@ private:
 	FunctionNode *current_function = nullptr;
 	SuiteNode *current_suite = nullptr;
 
+	CompletionContext completion_context;
+	CompletionCall completion_call;
+	List<CompletionCall> completion_call_stack;
+	bool passed_cursor = false;
+
 	typedef bool (GDScriptParser::*AnnotationAction)(const AnnotationNode *p_annotation, Node *p_target);
 	struct AnnotationInfo {
 		enum TargetKind {
@@ -1100,6 +1148,12 @@ private:
 	void push_warning(const Node *p_source, GDScriptWarning::Code p_code, const String &p_symbol1 = String(), const String &p_symbol2 = String(), const String &p_symbol3 = String(), const String &p_symbol4 = String());
 	void push_warning(const Node *p_source, GDScriptWarning::Code p_code, const Vector<String> &p_symbols);
 
+	void make_completion_context(CompletionType p_type, Node *p_node, int p_argument = -1, bool p_force = false);
+	void make_completion_context(CompletionType p_type, Variant::Type p_builtin_type, bool p_force = false);
+	void push_completion_call(Node *p_call);
+	void pop_completion_call();
+	void set_last_completion_call_arg(int p_argument);
+
 	GDScriptTokenizer::Token advance();
 	bool match(GDScriptTokenizer::Token::Type p_token_type);
 	bool check(GDScriptTokenizer::Token::Type p_token_type);
@@ -1187,6 +1241,10 @@ public:
 	static Variant::Type get_builtin_type(const StringName &p_type);
 	static GDScriptFunctions::Function get_builtin_function(const StringName &p_name);
 
+	CompletionContext get_completion_context() const { return completion_context; }
+	CompletionCall get_completion_call() const { return completion_call; }
+	void get_annotation_list(List<MethodInfo> *r_annotations) const;
+
 	const List<ParserError> &get_errors() const { return errors; }
 	const List<GDScriptWarning> &get_warnings() const { return warnings; }
 	const List<String> get_dependencies() const {
diff --git a/modules/gdscript/gdscript_tokenizer.cpp b/modules/gdscript/gdscript_tokenizer.cpp
index 7a02cc209c..b3834d97f7 100644
--- a/modules/gdscript/gdscript_tokenizer.cpp
+++ b/modules/gdscript/gdscript_tokenizer.cpp
@@ -191,13 +191,26 @@ int GDScriptTokenizer::get_cursor_column() const {
 	return cursor_column;
 }
 
+bool GDScriptTokenizer::is_past_cursor() const {
+	if (line < cursor_line) {
+		return false;
+	}
+	if (line > cursor_line) {
+		return true;
+	}
+	if (column < cursor_column) {
+		return false;
+	}
+	return true;
+}
+
 CharType GDScriptTokenizer::_advance() {
 	if (unlikely(_is_at_end())) {
 		return '\0';
 	}
 	_current++;
-	position++;
 	column++;
+	position++;
 	if (column > rightmost_column) {
 		rightmost_column = column;
 	}
@@ -246,7 +259,7 @@ static bool _is_binary_digit(CharType c) {
 	return (c == '0' || c == '1');
 }
 
-GDScriptTokenizer::Token GDScriptTokenizer::make_token(Token::Type p_type) const {
+GDScriptTokenizer::Token GDScriptTokenizer::make_token(Token::Type p_type) {
 	Token token(p_type);
 	token.start_line = start_line;
 	token.end_line = line;
@@ -254,17 +267,63 @@ GDScriptTokenizer::Token GDScriptTokenizer::make_token(Token::Type p_type) const
 	token.end_column = column;
 	token.leftmost_column = leftmost_column;
 	token.rightmost_column = rightmost_column;
+	token.source = String(_start, _current - _start);
+
+	if (p_type != Token::ERROR && cursor_line > -1) {
+		// Also count whitespace after token.
+		int offset = 0;
+		while (_peek(offset) == ' ' || _peek(offset) == '\t') {
+			offset++;
+		}
+		int last_column = column + offset;
+		// Check cursor position in token.
+		if (start_line == line) {
+			// Single line token.
+			if (cursor_line == start_line && cursor_column >= start_column && cursor_column <= last_column) {
+				token.cursor_position = cursor_column - start_column;
+				if (cursor_column == start_column) {
+					token.cursor_place = CURSOR_BEGINNING;
+				} else if (cursor_column < column) {
+					token.cursor_place = CURSOR_MIDDLE;
+				} else {
+					token.cursor_place = CURSOR_END;
+				}
+			}
+		} else {
+			// Multi line token.
+			if (cursor_line == start_line && cursor_column >= start_column) {
+				// Is in first line.
+				token.cursor_position = cursor_column - start_column;
+				if (cursor_column == start_column) {
+					token.cursor_place = CURSOR_BEGINNING;
+				} else {
+					token.cursor_place = CURSOR_MIDDLE;
+				}
+			} else if (cursor_line == line && cursor_column <= last_column) {
+				// Is in last line.
+				token.cursor_position = cursor_column - start_column;
+				if (cursor_column < column) {
+					token.cursor_place = CURSOR_MIDDLE;
+				} else {
+					token.cursor_place = CURSOR_END;
+				}
+			} else if (cursor_line > start_line && cursor_line < line) {
+				// Is in middle line.
+				token.cursor_position = CURSOR_MIDDLE;
+			}
+		}
+	}
 
 	return token;
 }
 
-GDScriptTokenizer::Token GDScriptTokenizer::make_literal(const Variant &p_literal) const {
+GDScriptTokenizer::Token GDScriptTokenizer::make_literal(const Variant &p_literal) {
 	Token token = make_token(Token::LITERAL);
 	token.literal = p_literal;
 	return token;
 }
 
-GDScriptTokenizer::Token GDScriptTokenizer::make_identifier(const StringName &p_identifier) const {
+GDScriptTokenizer::Token GDScriptTokenizer::make_identifier(const StringName &p_identifier) {
 	Token identifier = make_token(Token::IDENTIFIER);
 	identifier.literal = p_identifier;
 	return identifier;
@@ -321,14 +380,14 @@ GDScriptTokenizer::Token GDScriptTokenizer::check_vcs_marker(CharType p_test, To
 
 GDScriptTokenizer::Token GDScriptTokenizer::annotation() {
 	if (!_is_alphanumeric(_peek())) {
-		return make_error("Expected annotation identifier after \"@\".");
+		push_error("Expected annotation identifier after \"@\".");
 	}
 	while (_is_alphanumeric(_peek())) {
 		// Consume all identifier characters.
 		_advance();
 	}
 	Token annotation = make_token(Token::ANNOTATION);
-	annotation.literal = StringName(String(_start, _current - _start));
+	annotation.literal = StringName(annotation.source);
 	return annotation;
 }
 
diff --git a/modules/gdscript/gdscript_tokenizer.h b/modules/gdscript/gdscript_tokenizer.h
index 989b4337c1..df691be546 100644
--- a/modules/gdscript/gdscript_tokenizer.h
+++ b/modules/gdscript/gdscript_tokenizer.h
@@ -38,6 +38,13 @@
 
 class GDScriptTokenizer {
 public:
+	enum CursorPlace {
+		CURSOR_NONE,
+		CURSOR_BEGINNING,
+		CURSOR_MIDDLE,
+		CURSOR_END,
+	};
+
 	struct Token {
 		enum Type {
 			EMPTY,
@@ -155,6 +162,9 @@ public:
 		Variant literal;
 		int start_line = 0, end_line = 0, start_column = 0, end_column = 0;
 		int leftmost_column = 0, rightmost_column = 0; // Column span for multiline tokens.
+		int cursor_position = -1;
+		CursorPlace cursor_place = CURSOR_NONE;
+		String source;
 
 		const char *get_name() const;
 		// TODO: Allow some keywords as identifiers?
@@ -174,8 +184,8 @@ private:
 	String source;
 	const CharType *_source = nullptr;
 	const CharType *_current = nullptr;
-	int line = 0, column = 0;
-	int cursor_line = 0, cursor_column = 0;
+	int line = -1, column = -1;
+	int cursor_line = -1, cursor_column = -1;
 	int tab_size = 4;
 
 	// Keep track of multichar tokens.
@@ -209,9 +219,9 @@ private:
 	void push_error(const String &p_message);
 	void push_error(const Token &p_error);
 	Token make_paren_error(CharType p_paren);
-	Token make_token(Token::Type p_type) const;
-	Token make_literal(const Variant &p_literal) const;
-	Token make_identifier(const StringName &p_identifier) const;
+	Token make_token(Token::Type p_type);
+	Token make_literal(const Variant &p_literal);
+	Token make_identifier(const StringName &p_identifier);
 	Token check_vcs_marker(CharType p_test, Token::Type p_double_type);
 	void push_paren(CharType p_char);
 	bool pop_paren(CharType p_expected);
@@ -231,6 +241,7 @@ public:
 	int get_cursor_column() const;
 	void set_cursor_position(int p_line, int p_column);
 	void set_multiline_mode(bool p_state);
+	bool is_past_cursor() const;
 	static String get_token_name(Token::Type p_token_type);
 
 	GDScriptTokenizer();