Merge pull request #39415 from SkyLucilfer/PotGeneration

Add POT generation feature in Editor

doc/classes/EditorPlugin.xml

@@ -142,6 +142,15 @@
 				Adds a custom submenu under [b]Project > Tools >[/b] [code]name[/code]. [code]submenu[/code] should be an object of class [PopupMenu]. This submenu should be cleaned up using [code]remove_tool_menu_item(name)[/code].
 			</description>
 		</method>
+		<method name="add_translation_parser_plugin">
+			<return type="void">
+			</return>
+			<argument index="0" name="parser" type="EditorTranslationParserPlugin">
+			</argument>
+			<description>
+				Registers a custom translation parser plugin for extracting translatable strings from custom files.
+			</description>
+		</method>
 		<method name="apply_changes" qualifiers="virtual">
 			<return type="void">
 			</return>
@@ -464,6 +473,15 @@
 				Removes a menu [code]name[/code] from [b]Project &gt; Tools[/b].
 			</description>
 		</method>
+		<method name="remove_translation_parser_plugin">
+			<return type="void">
+			</return>
+			<argument index="0" name="parser" type="EditorTranslationParserPlugin">
+			</argument>
+			<description>
+				Removes a registered custom translation parser plugin.
+			</description>
+		</method>
 		<method name="save_external_data" qualifiers="virtual">
 			<return type="void">
 			</return>

doc/classes/EditorTranslationParserPlugin.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="EditorTranslationParserPlugin" inherits="Reference" version="4.0">
+	<brief_description>
+		Plugin for adding custom parsers to extract strings that are to be translated from custom files (.csv, .json etc.).
+	</brief_description>
+	<description>
+		Plugins are registered via [method EditorPlugin.add_translation_parser_plugin] method. To define the parsing and string extraction logic, override the [method parse_text] method in script.
+		The extracted strings will be written into a POT file selected by user under "POT Generation" in "Localization" tab in "Project Settings" menu.
+		Below shows an example of a custom parser that extracts strings in a CSV file to write into a POT.
+		[codeblock]
+		tool
+		extends EditorTranslationParserPlugin
+
+		func parse_text(text, extracted_strings):
+		    var split_strs = text.split(",", false, 0)
+		    for s in split_strs:
+		        extracted_strings.append(s)
+		        #print("Extracted string: " + s)
+
+		func get_recognized_extensions():
+		    return ["csv"]
+		[/codeblock]		
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+		<method name="get_recognized_extensions" qualifiers="virtual">
+			<return type="Array">
+			</return>
+			<description>
+				Gets the list of file extensions to associate with this parser, e.g. [code]["csv"][/code].
+			</description>
+		</method>
+		<method name="parse_text" qualifiers="virtual">
+			<return type="void">
+			</return>
+			<argument index="0" name="text" type="String">
+			</argument>
+			<argument index="1" name="extracted_strings" type="Array">
+			</argument>
+			<description>
+				Override this method to define a custom parsing logic to extract the translatable strings.
+			</description>
+		</method>
+	</methods>
+	<constants>
+	</constants>
+</class>

editor/editor_node.cpp

@@ -85,6 +85,7 @@
 #include "editor/editor_settings.h"
 #include "editor/editor_spin_slider.h"
 #include "editor/editor_themes.h"
+#include "editor/editor_translation_parser.h"
 #include "editor/export_template_manager.h"
 #include "editor/filesystem_dock.h"
 #include "editor/import/editor_import_collada.h"
@@ -137,6 +138,7 @@
 #include "editor/plugins/multimesh_editor_plugin.h"
 #include "editor/plugins/navigation_polygon_editor_plugin.h"
 #include "editor/plugins/node_3d_editor_plugin.h"
+#include "editor/plugins/packed_scene_translation_parser_plugin.h"
 #include "editor/plugins/path_2d_editor_plugin.h"
 #include "editor/plugins/path_3d_editor_plugin.h"
 #include "editor/plugins/physical_bone_3d_editor_plugin.h"
@@ -3588,6 +3590,7 @@ void EditorNode::register_editor_types() {
 	ResourceSaver::set_timestamp_on_save(true);
 
 	ClassDB::register_class<EditorPlugin>();
+	ClassDB::register_class<EditorTranslationParserPlugin>();
 	ClassDB::register_class<EditorImportPlugin>();
 	ClassDB::register_class<EditorScript>();
 	ClassDB::register_class<EditorSelection>();
@@ -6656,6 +6659,10 @@ EditorNode::EditorNode() {
 
 	EditorExport::get_singleton()->add_export_plugin(export_text_to_binary_plugin);
 
+	Ref<PackedSceneEditorTranslationParserPlugin> packed_scene_translation_parser_plugin;
+	packed_scene_translation_parser_plugin.instance();
+	EditorTranslationParser::get_singleton()->add_parser(packed_scene_translation_parser_plugin, EditorTranslationParser::STANDARD);
+
 	_edit_current();
 	current = nullptr;
 	saving_resource = Ref<Resource>();

editor/editor_plugin.cpp

@@ -663,6 +663,14 @@ bool EditorPlugin::get_remove_list(List<Node *> *p_list) {
 void EditorPlugin::restore_global_state() {}
 void EditorPlugin::save_global_state() {}
 
+void EditorPlugin::add_translation_parser_plugin(const Ref<EditorTranslationParserPlugin> &p_parser) {
+	EditorTranslationParser::get_singleton()->add_parser(p_parser, EditorTranslationParser::CUSTOM);
+}
+
+void EditorPlugin::remove_translation_parser_plugin(const Ref<EditorTranslationParserPlugin> &p_parser) {
+	EditorTranslationParser::get_singleton()->remove_parser(p_parser, EditorTranslationParser::CUSTOM);
+}
+
 void EditorPlugin::add_import_plugin(const Ref<EditorImportPlugin> &p_importer) {
 	ResourceFormatImporter::get_singleton()->add_importer(p_importer);
 	EditorFileSystem::get_singleton()->call_deferred("scan");
@@ -796,6 +804,8 @@ void EditorPlugin::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("get_undo_redo"), &EditorPlugin::_get_undo_redo);
 	ClassDB::bind_method(D_METHOD("queue_save_layout"), &EditorPlugin::queue_save_layout);
+	ClassDB::bind_method(D_METHOD("add_translation_parser_plugin", "parser"), &EditorPlugin::add_translation_parser_plugin);
+	ClassDB::bind_method(D_METHOD("remove_translation_parser_plugin", "parser"), &EditorPlugin::remove_translation_parser_plugin);
 	ClassDB::bind_method(D_METHOD("add_import_plugin", "importer"), &EditorPlugin::add_import_plugin);
 	ClassDB::bind_method(D_METHOD("remove_import_plugin", "importer"), &EditorPlugin::remove_import_plugin);
 	ClassDB::bind_method(D_METHOD("add_scene_import_plugin", "scene_importer"), &EditorPlugin::add_scene_import_plugin);

editor/editor_plugin.h

@@ -34,6 +34,7 @@
 #include "core/io/config_file.h"
 #include "core/undo_redo.h"
 #include "editor/editor_inspector.h"
+#include "editor/editor_translation_parser.h"
 #include "editor/import/editor_import_plugin.h"
 #include "editor/import/resource_importer_scene.h"
 #include "editor/script_create_dialog.h"
@@ -220,6 +221,9 @@ public:
 	virtual void restore_global_state();
 	virtual void save_global_state();
 
+	void add_translation_parser_plugin(const Ref<EditorTranslationParserPlugin> &p_parser);
+	void remove_translation_parser_plugin(const Ref<EditorTranslationParserPlugin> &p_parser);
+
 	void add_import_plugin(const Ref<EditorImportPlugin> &p_importer);
 	void remove_import_plugin(const Ref<EditorImportPlugin> &p_importer);
 

editor/editor_translation_parser.cpp

@@ -0,0 +1,180 @@
+/*************************************************************************/
+/*  editor_translation_parser.cpp                                        */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "editor_translation_parser.h"
+
+#include "core/error_macros.h"
+#include "core/os/file_access.h"
+#include "core/script_language.h"
+#include "core/set.h"
+
+EditorTranslationParser *EditorTranslationParser::singleton = nullptr;
+
+Error EditorTranslationParserPlugin::parse_file(const String &p_path, Vector<String> *r_extracted_strings) {
+	if (!get_script_instance())
+		return ERR_UNAVAILABLE;
+
+	if (get_script_instance()->has_method("parse_text")) {
+		Error err;
+		FileAccess *file = FileAccess::open(p_path, FileAccess::READ, &err);
+		if (err != OK) {
+			ERR_PRINT("Failed to open " + p_path);
+			return err;
+		}
+		parse_text(file->get_as_utf8_string(), r_extracted_strings);
+		return OK;
+	} else {
+		ERR_PRINT("Custom translation parser plugin's \"func parse_text(text, extracted_strings)\" is undefined.");
+		return ERR_UNAVAILABLE;
+	}
+}
+
+void EditorTranslationParserPlugin::parse_text(const String &p_text, Vector<String> *r_extracted_strings) {
+	if (!get_script_instance())
+		return;
+
+	if (get_script_instance()->has_method("parse_text")) {
+		Array extracted_strings;
+		get_script_instance()->call("parse_text", p_text, extracted_strings);
+		for (int i = 0; i < extracted_strings.size(); i++) {
+			r_extracted_strings->append(extracted_strings[i]);
+		}
+	} else {
+		ERR_PRINT("Custom translation parser plugin's \"func parse_text(text, extracted_strings)\" is undefined.");
+	}
+}
+
+void EditorTranslationParserPlugin::get_recognized_extensions(List<String> *r_extensions) const {
+	if (!get_script_instance())
+		return;
+
+	if (get_script_instance()->has_method("get_recognized_extensions")) {
+		Array extensions = get_script_instance()->call("get_recognized_extensions");
+		for (int i = 0; i < extensions.size(); i++) {
+			r_extensions->push_back(extensions[i]);
+		}
+	} else {
+		ERR_PRINT("Custom translation parser plugin's \"func get_recognized_extensions()\" is undefined.");
+	}
+}
+
+void EditorTranslationParserPlugin::_bind_methods() {
+	ClassDB::add_virtual_method(get_class_static(), MethodInfo(Variant::NIL, "parse_text", PropertyInfo(Variant::STRING, "text"), PropertyInfo(Variant::ARRAY, "extracted_strings")));
+	ClassDB::add_virtual_method(get_class_static(), MethodInfo(Variant::ARRAY, "get_recognized_extensions"));
+}
+
+/////////////////////////
+
+void EditorTranslationParser::get_recognized_extensions(List<String> *r_extensions) const {
+	Set<String> extensions;
+	List<String> temp;
+	for (int i = 0; i < standard_parsers.size(); i++) {
+		standard_parsers[i]->get_recognized_extensions(&temp);
+	}
+	for (int i = 0; i < custom_parsers.size(); i++) {
+		custom_parsers[i]->get_recognized_extensions(&temp);
+	}
+	// Remove duplicates.
+	for (int i = 0; i < temp.size(); i++) {
+		extensions.insert(temp[i]);
+	}
+	for (auto E = extensions.front(); E; E = E->next()) {
+		r_extensions->push_back(E->get());
+	}
+}
+
+bool EditorTranslationParser::can_parse(const String &p_extension) const {
+	List<String> extensions;
+	get_recognized_extensions(&extensions);
+	for (int i = 0; i < extensions.size(); i++) {
+		if (p_extension == extensions[i]) {
+			return true;
+		}
+	}
+	return false;
+}
+
+Ref<EditorTranslationParserPlugin> EditorTranslationParser::get_parser(const String &p_extension) const {
+	// Consider user-defined parsers first.
+	for (int i = 0; i < custom_parsers.size(); i++) {
+		List<String> temp;
+		custom_parsers[i]->get_recognized_extensions(&temp);
+		for (int j = 0; j < temp.size(); j++) {
+			if (temp[j] == p_extension) {
+				return custom_parsers[i];
+			}
+		}
+	}
+
+	for (int i = 0; i < standard_parsers.size(); i++) {
+		List<String> temp;
+		standard_parsers[i]->get_recognized_extensions(&temp);
+		for (int j = 0; j < temp.size(); j++) {
+			if (temp[j] == p_extension) {
+				return standard_parsers[i];
+			}
+		}
+	}
+
+	WARN_PRINT("No translation parser available for \"" + p_extension + "\" extension.");
+
+	return nullptr;
+}
+
+void EditorTranslationParser::add_parser(const Ref<EditorTranslationParserPlugin> &p_parser, ParserType p_type) {
+	if (p_type == ParserType::STANDARD) {
+		standard_parsers.push_back(p_parser);
+	} else if (p_type == ParserType::CUSTOM) {
+		custom_parsers.push_back(p_parser);
+	}
+}
+
+void EditorTranslationParser::remove_parser(const Ref<EditorTranslationParserPlugin> &p_parser, ParserType p_type) {
+	if (p_type == ParserType::STANDARD) {
+		standard_parsers.erase(p_parser);
+	} else if (p_type == ParserType::CUSTOM) {
+		custom_parsers.erase(p_parser);
+	}
+}
+
+EditorTranslationParser *EditorTranslationParser::get_singleton() {
+	if (!singleton) {
+		singleton = memnew(EditorTranslationParser);
+	}
+	return singleton;
+}
+
+EditorTranslationParser::EditorTranslationParser() {
+}
+
+EditorTranslationParser::~EditorTranslationParser() {
+	memdelete(singleton);
+	singleton = nullptr;
+}

editor/editor_translation_parser.h

@@ -0,0 +1,73 @@
+/*************************************************************************/
+/*  editor_translation_parser.h                                          */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef EDITOR_TRANSLATION_PARSER_H
+#define EDITOR_TRANSLATION_PARSER_H
+
+#include "core/error_list.h"
+#include "core/reference.h"
+
+class EditorTranslationParserPlugin : public Reference {
+	GDCLASS(EditorTranslationParserPlugin, Reference);
+
+protected:
+	static void _bind_methods();
+
+public:
+	virtual Error parse_file(const String &p_path, Vector<String> *r_extracted_strings);
+	virtual void parse_text(const String &p_text, Vector<String> *r_extracted_strings);
+	virtual void get_recognized_extensions(List<String> *r_extensions) const;
+};
+
+class EditorTranslationParser {
+	static EditorTranslationParser *singleton;
+
+public:
+	enum ParserType {
+		STANDARD, // GDScript, CSharp, ...
+		CUSTOM // User-defined parser plugins. This will override standard parsers if the same extension type is defined.
+	};
+
+	static EditorTranslationParser *get_singleton();
+
+	Vector<Ref<EditorTranslationParserPlugin>> standard_parsers;
+	Vector<Ref<EditorTranslationParserPlugin>> custom_parsers;
+
+	void get_recognized_extensions(List<String> *r_extensions) const;
+	bool can_parse(const String &p_extension) const;
+	Ref<EditorTranslationParserPlugin> get_parser(const String &p_extension) const;
+	void add_parser(const Ref<EditorTranslationParserPlugin> &p_parser, ParserType p_type);
+	void remove_parser(const Ref<EditorTranslationParserPlugin> &p_parser, ParserType p_type);
+
+	EditorTranslationParser();
+	~EditorTranslationParser();
+};
+
+#endif // EDITOR_TRANSLATION_PARSER_H

editor/plugins/packed_scene_translation_parser_plugin.cpp

@@ -0,0 +1,114 @@
+/*************************************************************************/
+/*  packed_scene_translation_parser_plugin.cpp                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "packed_scene_translation_parser_plugin.h"
+
+#include "core/io/resource_loader.h"
+#include "scene/resources/packed_scene.h"
+
+void PackedSceneEditorTranslationParserPlugin::get_recognized_extensions(List<String> *r_extensions) const {
+	ResourceLoader::get_recognized_extensions_for_type("PackedScene", r_extensions);
+}
+
+Error PackedSceneEditorTranslationParserPlugin::parse_file(const String &p_path, Vector<String> *r_extracted_strings) {
+	// Parse specific scene Node's properties (see in constructor) that are auto-translated by the engine when set. E.g Label's text property.
+	// These properties are translated with the tr() function in the C++ code when being set or updated.
+
+	Error err;
+	RES loaded_res = ResourceLoader::load(p_path, "PackedScene", false, &err);
+	if (err) {
+		ERR_PRINT("Failed to load " + p_path);
+		return err;
+	}
+	Ref<SceneState> state = Ref<PackedScene>(loaded_res)->get_state();
+
+	Vector<String> parsed_strings;
+	String property_name;
+	Variant property_value;
+	for (int i = 0; i < state->get_node_count(); i++) {
+		if (!ClassDB::is_parent_class(state->get_node_type(i), "Control") && !ClassDB::is_parent_class(state->get_node_type(i), "Viewport")) {
+			continue;
+		}
+
+		for (int j = 0; j < state->get_node_property_count(i); j++) {
+			property_name = state->get_node_property_name(i, j);
+			if (!lookup_properties.has(property_name)) {
+				continue;
+			}
+
+			property_value = state->get_node_property_value(i, j);
+
+			if (property_name == "script" && property_value.get_type() == Variant::OBJECT && !property_value.is_null()) {
+				// Parse built-in script.
+				Ref<Script> s = Object::cast_to<Script>(property_value);
+				String extension = s->get_language()->get_extension();
+				if (EditorTranslationParser::get_singleton()->can_parse(extension)) {
+					Vector<String> temp;
+					EditorTranslationParser::get_singleton()->get_parser(extension)->parse_text(s->get_source_code(), &temp);
+					parsed_strings.append_array(temp);
+				}
+			} else if (property_name == "filters") {
+				// Extract FileDialog's filters property with values in format "*.png ; PNG Images","*.gd ; GDScript Files".
+				Vector<String> str_values = property_value;
+				for (int k = 0; k < str_values.size(); k++) {
+					String desc = str_values[k].get_slice(";", 1).strip_edges();
+					if (!desc.empty()) {
+						parsed_strings.push_back(desc);
+					}
+				}
+			} else if (property_value.get_type() == Variant::STRING) {
+				String str_value = String(property_value);
+				// Prevent reading text containing only spaces.
+				if (!str_value.strip_edges().empty()) {
+					parsed_strings.push_back(str_value);
+				}
+			}
+		}
+	}
+
+	r_extracted_strings->append_array(parsed_strings);
+
+	return OK;
+}
+
+PackedSceneEditorTranslationParserPlugin::PackedSceneEditorTranslationParserPlugin() {
+	// Scene Node's properties containing strings that will be fetched for translation.
+	lookup_properties.insert("text");
+	lookup_properties.insert("hint_tooltip");
+	lookup_properties.insert("placeholder_text");
+	lookup_properties.insert("dialog_text");
+	lookup_properties.insert("filters");
+	lookup_properties.insert("script");
+
+	//Add exception list (to prevent false positives)
+	//line edit, text edit, richtextlabel
+	//Set<String> exception_list;
+	//exception_list.insert("RichTextLabel");
+}

editor/plugins/packed_scene_translation_parser_plugin.h

@@ -0,0 +1,49 @@
+/*************************************************************************/
+/*  packed_scene_translation_parser_plugin.h                             */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef PACKED_SCENE_TRANSLATION_PARSER_PLUGIN_H
+#define PACKED_SCENE_TRANSLATION_PARSER_PLUGIN_H
+
+#include "editor/editor_translation_parser.h"
+
+class PackedSceneEditorTranslationParserPlugin : public EditorTranslationParserPlugin {
+	GDCLASS(PackedSceneEditorTranslationParserPlugin, EditorTranslationParserPlugin);
+
+	// Scene Node's properties that contain translation strings.
+	Set<String> lookup_properties;
+
+public:
+	virtual Error parse_file(const String &p_path, Vector<String> *r_extracted_strings);
+	virtual void get_recognized_extensions(List<String> *r_extensions) const;
+
+	PackedSceneEditorTranslationParserPlugin();
+};
+
+#endif // PACKED_SCENE_TRANSLATION_PARSER_PLUGIN_H

editor/pot_generator.cpp

@@ -0,0 +1,166 @@
+/*************************************************************************/
+/*  pot_generator.cpp                                                    */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "pot_generator.h"
+
+#include "core/error_macros.h"
+#include "core/os/file_access.h"
+#include "core/project_settings.h"
+#include "editor_translation_parser.h"
+#include "plugins/packed_scene_translation_parser_plugin.h"
+
+POTGenerator *POTGenerator::singleton = nullptr;
+
+//#define DEBUG_POT
+
+#ifdef DEBUG_POT
+void _print_all_translation_strings(const OrderedHashMap<String, Set<String>> &p_all_translation_strings) {
+	for (auto E_pair = p_all_translation_strings.front(); E_pair; E_pair = E_pair.next()) {
+		String msg = static_cast<String>(E_pair.key()) + " : ";
+		for (Set<String>::Element *E = E_pair.value().front(); E; E = E->next()) {
+			msg += E->get() + " ";
+		}
+		print_line(msg);
+	}
+}
+#endif
+
+void POTGenerator::generate_pot(const String &p_file) {
+	if (!ProjectSettings::get_singleton()->has_setting("locale/translations_pot_files")) {
+		WARN_PRINT("No files selected for POT generation.");
+		return;
+	}
+
+	// Clear all_translation_strings of the previous round.
+	all_translation_strings.clear();
+
+	Vector<String> files = ProjectSettings::get_singleton()->get("locale/translations_pot_files");
+
+	// Collect all translatable strings according to files order in "POT Generation" setting.
+	for (int i = 0; i < files.size(); i++) {
+		Vector<String> translation_strings;
+		String file_path = files[i];
+		String file_extension = file_path.get_extension();
+
+		if (EditorTranslationParser::get_singleton()->can_parse(file_extension)) {
+			EditorTranslationParser::get_singleton()->get_parser(file_extension)->parse_file(file_path, &translation_strings);
+		} else {
+			ERR_PRINT("Unrecognized file extension " + file_extension + " in generate_pot()");
+			return;
+		}
+
+		// Store translation strings parsed in this iteration along with their corresponding source file - to write into POT later on.
+		for (int j = 0; j < translation_strings.size(); j++) {
+			all_translation_strings[translation_strings[j]].insert(file_path);
+		}
+	}
+
+#ifdef DEBUG_POT
+	_print_all_translation_strings(all_translation_strings);
+#endif
+
+	_write_to_pot(p_file);
+}
+
+void POTGenerator::_write_to_pot(const String &p_file) {
+	Error err;
+	FileAccess *file = FileAccess::open(p_file, FileAccess::WRITE, &err);
+	if (err != OK) {
+		ERR_PRINT("Failed to open " + p_file);
+		return;
+	}
+
+	String project_name = ProjectSettings::get_singleton()->get("application/config/name");
+	Vector<String> files = ProjectSettings::get_singleton()->get("locale/translations_pot_files");
+	String extracted_files = "";
+	for (int i = 0; i < files.size(); i++) {
+		extracted_files += "# " + files[i] + "\n";
+	}
+	const String header =
+			"# LANGUAGE translation for " + project_name + " for the following files:\n" + extracted_files +
+			"#\n"
+			"#\n"
+			"# FIRST AUTHOR < EMAIL @ADDRESS>, YEAR.\n"
+			"#\n"
+			"#, fuzzy\n"
+			"msgid \"\"\n"
+			"msgstr \"\"\n"
+			"\"Project-Id-Version: " +
+			project_name + "\\n\"\n"
+						   "\"Content-Type: text/plain; charset=UTF-8\\n\"\n"
+						   "\"Content-Transfer-Encoding: 8-bit\\n\"\n\n";
+
+	file->store_string(header);
+
+	for (OrderedHashMap<String, Set<String>>::Element E_pair = all_translation_strings.front(); E_pair; E_pair = E_pair.next()) {
+		String msg = E_pair.key();
+
+		// Write file locations.
+		for (Set<String>::Element *E = E_pair.value().front(); E; E = E->next()) {
+			file->store_line("#: " + E->get().trim_prefix("res://"));
+		}
+
+		// Split \\n and \n.
+		Vector<String> temp = msg.split("\\n");
+		Vector<String> msg_lines;
+		for (int i = 0; i < temp.size(); i++) {
+			msg_lines.append_array(temp[i].split("\n"));
+			if (i < temp.size() - 1) {
+				// Add \n.
+				msg_lines.set(msg_lines.size() - 1, msg_lines[msg_lines.size() - 1] + "\\n");
+			}
+		}
+
+		// Write msgid.
+		file->store_string("msgid ");
+		for (int i = 0; i < msg_lines.size(); i++) {
+			file->store_line("\"" + msg_lines[i] + "\"");
+		}
+
+		file->store_line("msgstr \"\"\n");
+	}
+
+	file->close();
+}
+
+POTGenerator *POTGenerator::get_singleton() {
+	if (!singleton) {
+		singleton = memnew(POTGenerator);
+	}
+	return singleton;
+}
+
+POTGenerator::POTGenerator() {
+}
+
+POTGenerator::~POTGenerator() {
+	memdelete(singleton);
+	singleton = nullptr;
+}

editor/pot_generator.h

@@ -0,0 +1,52 @@
+/*************************************************************************/
+/*  pot_generator.h                                                      */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef POT_GENERATOR_H
+#define POT_GENERATOR_H
+
+#include "core/ordered_hash_map.h"
+#include "core/set.h"
+
+class POTGenerator {
+	static POTGenerator *singleton;
+	// Stores all translatable strings and the source files containing them.
+	OrderedHashMap<String, Set<String>> all_translation_strings;
+
+	void _write_to_pot(const String &p_file);
+
+public:
+	static POTGenerator *get_singleton();
+	void generate_pot(const String &p_file);
+
+	POTGenerator();
+	~POTGenerator();
+};
+
+#endif // POT_GENERATOR_H

editor/project_settings_editor.cpp

@@ -38,6 +38,8 @@
 #include "editor/editor_export.h"
 #include "editor/editor_node.h"
 #include "editor/editor_scale.h"
+#include "editor/editor_translation_parser.h"
+#include "editor/pot_generator.h"
 #include "scene/gui/margin_container.h"
 #include "scene/gui/tab_container.h"
 
@@ -120,6 +122,7 @@ void ProjectSettingsEditor::_notification(int p_what) {
 			action_add_error->add_theme_color_override("font_color", input_editor->get_theme_color("error_color", "Editor"));
 
 			translation_list->connect("button_pressed", callable_mp(this, &ProjectSettingsEditor::_translation_delete));
+			translation_pot_list->connect("button_pressed", callable_mp(this, &ProjectSettingsEditor::_translation_pot_delete));
 			_update_actions();
 			popup_add->add_icon_item(input_editor->get_theme_icon("Keyboard", "EditorIcons"), TTR("Key"), INPUT_KEY);
 			popup_add->add_icon_item(input_editor->get_theme_icon("KeyboardPhysical", "EditorIcons"), TTR("Physical Key"), INPUT_KEY_PHYSICAL);
@@ -140,6 +143,9 @@ void ProjectSettingsEditor::_notification(int p_what) {
 				translation_res_option_file_open->add_filter("*." + E->get());
 			}
 
+			_update_translation_pot_file_extensions();
+			translation_pot_generate->add_filter("*.pot");
+
 			restart_close_button->set_icon(input_editor->get_theme_icon("Close", "EditorIcons"));
 			restart_container->add_theme_style_override("panel", input_editor->get_theme_stylebox("bg", "Tree"));
 			restart_icon->set_texture(input_editor->get_theme_icon("StatusWarning", "EditorIcons"));
@@ -865,6 +871,8 @@ void ProjectSettingsEditor::popup_project_settings() {
 	_update_translations();
 	autoload_settings->update_autoload();
 	plugin_settings->update_plugins();
+	// New translation parser plugin might extend possible file extensions in POT generation.
+	_update_translation_pot_file_extensions();
 	set_process_unhandled_input(true);
 }
 
@@ -1519,8 +1527,71 @@ void ProjectSettingsEditor::_translation_filter_mode_changed(int p_mode) {
 	undo_redo->commit_action();
 }
 
+void ProjectSettingsEditor::_translation_pot_add(const String &p_path) {
+	PackedStringArray pot_translations = ProjectSettings::get_singleton()->get("locale/translations_pot_files");
+
+	for (int i = 0; i < pot_translations.size(); i++) {
+		if (pot_translations[i] == p_path) {
+			return; //exists
+		}
+	}
+
+	pot_translations.push_back(p_path);
+	undo_redo->create_action(TTR("Add files for POT generation"));
+	undo_redo->add_do_property(ProjectSettings::get_singleton(), "locale/translations_pot_files", pot_translations);
+	undo_redo->add_undo_property(ProjectSettings::get_singleton(), "locale/translations_pot_files", ProjectSettings::get_singleton()->get("locale/translations_pot_files"));
+	undo_redo->add_do_method(this, "_update_translations");
+	undo_redo->add_undo_method(this, "_update_translations");
+	undo_redo->add_do_method(this, "_settings_changed");
+	undo_redo->add_undo_method(this, "_settings_changed");
+	undo_redo->commit_action();
+}
+
+void ProjectSettingsEditor::_translation_pot_delete(Object *p_item, int p_column, int p_button) {
+	TreeItem *ti = Object::cast_to<TreeItem>(p_item);
+	ERR_FAIL_COND(!ti);
+
+	int idx = ti->get_metadata(0);
+
+	PackedStringArray pot_translations = ProjectSettings::get_singleton()->get("locale/translations_pot_files");
+
+	ERR_FAIL_INDEX(idx, pot_translations.size());
+
+	pot_translations.remove(idx);
+
+	undo_redo->create_action(TTR("Remove file from POT generation"));
+	undo_redo->add_do_property(ProjectSettings::get_singleton(), "locale/translations_pot_files", pot_translations);
+	undo_redo->add_undo_property(ProjectSettings::get_singleton(), "locale/translations_pot_files", ProjectSettings::get_singleton()->get("locale/translations_pot_files"));
+	undo_redo->add_do_method(this, "_update_translations");
+	undo_redo->add_undo_method(this, "_update_translations");
+	undo_redo->add_do_method(this, "_settings_changed");
+	undo_redo->add_undo_method(this, "_settings_changed");
+	undo_redo->commit_action();
+}
+
+void ProjectSettingsEditor::_translation_pot_file_open() {
+	translation_pot_file_open->popup_centered_ratio();
+}
+
+void ProjectSettingsEditor::_translation_pot_generate_open() {
+	translation_pot_generate->popup_centered_ratio();
+}
+
+void ProjectSettingsEditor::_translation_pot_generate(const String &p_file) {
+	POTGenerator::get_singleton()->generate_pot(p_file);
+}
+
+void ProjectSettingsEditor::_update_translation_pot_file_extensions() {
+	translation_pot_file_open->clear_filters();
+	List<String> translation_parse_file_extensions;
+	EditorTranslationParser::get_singleton()->get_recognized_extensions(&translation_parse_file_extensions);
+	for (List<String>::Element *E = translation_parse_file_extensions.front(); E; E = E->next()) {
+		translation_pot_file_open->add_filter("*." + E->get());
+	}
+}
+
 void ProjectSettingsEditor::_update_translations() {
-	//update translations
+	// Update translations.
 
 	if (updating_translations) {
 		return;
@@ -1601,7 +1672,7 @@ void ProjectSettingsEditor::_update_translations() {
 		}
 	}
 
-	//update translation remaps
+	// Update translation remaps.
 
 	String remap_selected;
 	if (translation_remap->get_selected()) {
@@ -1696,6 +1767,23 @@ void ProjectSettingsEditor::_update_translations() {
 		}
 	}
 
+	// Update translation POT files.
+
+	translation_pot_list->clear();
+	root = translation_pot_list->create_item(nullptr);
+	translation_pot_list->set_hide_root(true);
+	if (ProjectSettings::get_singleton()->has_setting("locale/translations_pot_files")) {
+		PackedStringArray pot_translations = ProjectSettings::get_singleton()->get("locale/translations_pot_files");
+		for (int i = 0; i < pot_translations.size(); i++) {
+			TreeItem *t = translation_pot_list->create_item(root);
+			t->set_editable(0, false);
+			t->set_text(0, pot_translations[i].replace_first("res://", ""));
+			t->set_tooltip(0, pot_translations[i]);
+			t->set_metadata(0, i);
+			t->add_button(0, input_editor->get_theme_icon("Remove", "EditorIcons"), 0, false, TTR("Remove"));
+		}
+	}
+
 	updating_translations = false;
 }
 
@@ -2108,6 +2196,38 @@ ProjectSettingsEditor::ProjectSettingsEditor(EditorData *p_data) {
 		translation_filter->connect("item_edited", callable_mp(this, &ProjectSettingsEditor::_translation_filter_option_changed));
 	}
 
+	{
+		VBoxContainer *tvb = memnew(VBoxContainer);
+		translations->add_child(tvb);
+		tvb->set_name(TTR("POT Generation"));
+		HBoxContainer *thb = memnew(HBoxContainer);
+		tvb->add_child(thb);
+		thb->add_child(memnew(Label(TTR("Files with translation strings:"))));
+		thb->add_spacer();
+		Button *addtr = memnew(Button(TTR("Add...")));
+		addtr->connect("pressed", callable_mp(this, &ProjectSettingsEditor::_translation_pot_file_open));
+		thb->add_child(addtr);
+		Button *generate = memnew(Button(TTR("Generate POT")));
+		generate->connect("pressed", callable_mp(this, &ProjectSettingsEditor::_translation_pot_generate_open));
+		thb->add_child(generate);
+		VBoxContainer *tmc = memnew(VBoxContainer);
+		tvb->add_child(tmc);
+		tmc->set_v_size_flags(Control::SIZE_EXPAND_FILL);
+		translation_pot_list = memnew(Tree);
+		translation_pot_list->set_v_size_flags(Control::SIZE_EXPAND_FILL);
+		tmc->add_child(translation_pot_list);
+
+		translation_pot_generate = memnew(EditorFileDialog);
+		add_child(translation_pot_generate);
+		translation_pot_generate->set_file_mode(EditorFileDialog::FILE_MODE_SAVE_FILE);
+		translation_pot_generate->connect("file_selected", callable_mp(this, &ProjectSettingsEditor::_translation_pot_generate));
+
+		translation_pot_file_open = memnew(EditorFileDialog);
+		add_child(translation_pot_file_open);
+		translation_pot_file_open->set_file_mode(EditorFileDialog::FILE_MODE_OPEN_FILE);
+		translation_pot_file_open->connect("file_selected", callable_mp(this, &ProjectSettingsEditor::_translation_pot_add));
+	}
+
 	autoload_settings = memnew(EditorAutoloadSettings);
 	autoload_settings->set_name(TTR("AutoLoad"));
 	tab_container->add_child(autoload_settings);

editor/project_settings_editor.h

@@ -110,6 +110,10 @@ class ProjectSettingsEditor : public AcceptDialog {
 	Vector<TreeItem *> translation_filter_treeitems;
 	Vector<int> translation_locales_idxs_remap;
 
+	Tree *translation_pot_list;
+	EditorFileDialog *translation_pot_file_open;
+	EditorFileDialog *translation_pot_generate;
+
 	EditorAutoloadSettings *autoload_settings;
 
 	EditorPluginSettings *plugin_settings;
@@ -159,6 +163,13 @@ class ProjectSettingsEditor : public AcceptDialog {
 	void _translation_filter_option_changed();
 	void _translation_filter_mode_changed(int p_mode);
 
+	void _translation_pot_add(const String &p_path);
+	void _translation_pot_delete(Object *p_item, int p_column, int p_button);
+	void _translation_pot_file_open();
+	void _translation_pot_generate_open();
+	void _translation_pot_generate(const String &p_file);
+	void _update_translation_pot_file_extensions();
+
 	void _toggle_search_bar(bool p_pressed);
 
 	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);

modules/gdscript/editor/gdscript_translation_parser_plugin.cpp

@@ -0,0 +1,178 @@
+/*************************************************************************/
+/*  gdscript_translation_parser_plugin.cpp                               */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "gdscript_translation_parser_plugin.h"
+
+#include "core/io/resource_loader.h"
+#include "modules/gdscript/gdscript.h"
+
+void GDScriptEditorTranslationParserPlugin::get_recognized_extensions(List<String> *r_extensions) const {
+	GDScriptLanguage::get_singleton()->get_recognized_extensions(r_extensions);
+}
+
+Error GDScriptEditorTranslationParserPlugin::parse_file(const String &p_path, Vector<String> *r_extracted_strings) {
+	List<String> extensions;
+	get_recognized_extensions(&extensions);
+	bool extension_valid = false;
+	for (auto E = extensions.front(); E; E = E->next()) {
+		if (p_path.get_extension() == E->get()) {
+			extension_valid = true;
+			break;
+		}
+	}
+
+	if (!extension_valid) {
+		Vector<String> temp;
+		for (auto E = extensions.front(); E; E = E->next()) {
+			temp.push_back(E->get());
+		}
+		String valid_extensions = String(", ").join(temp);
+		ERR_PRINT("Argument p_path \"" + p_path + "\" has wrong extension. List of valid extensions: " + valid_extensions);
+		return ERR_INVALID_PARAMETER;
+	}
+
+	Error err;
+	RES loaded_res = ResourceLoader::load(p_path, "", false, &err);
+	if (err) {
+		ERR_PRINT("Failed to load " + p_path);
+		return err;
+	}
+
+	Ref<GDScript> gdscript = loaded_res;
+	parse_text(gdscript->get_source_code(), r_extracted_strings);
+
+	return OK;
+}
+
+void GDScriptEditorTranslationParserPlugin::parse_text(const String &p_text, Vector<String> *r_extracted_strings) {
+	// Parse and match all GDScript function API that involves translation string.
+	// E.g get_node("Label").text = "something", var test = tr("something"), "something" will be matched and collected.
+
+	Vector<String> parsed_strings;
+
+	// Search translation strings with RegEx.
+	regex.clear();
+	regex.compile(String("|").join(patterns));
+	Array results = regex.search_all(p_text);
+	_get_captured_strings(results, &parsed_strings);
+
+	// Special handling for FileDialog.
+	Vector<String> temp;
+	_parse_file_dialog(p_text, &temp);
+	parsed_strings.append_array(temp);
+
+	// Filter out / and +
+	String filter = "(?:\\\\\\n|\"[\\s\\\\]*\\+\\s*\")";
+	regex.clear();
+	regex.compile(filter);
+	for (int i = 0; i < parsed_strings.size(); i++) {
+		parsed_strings.set(i, regex.sub(parsed_strings[i], "", true));
+	}
+
+	r_extracted_strings->append_array(parsed_strings);
+}
+
+void GDScriptEditorTranslationParserPlugin::_parse_file_dialog(const String &p_source_code, Vector<String> *r_output) {
+	// FileDialog API has the form .filters = PackedStringArray(["*.png ; PNG Images","*.gd ; GDScript Files"]).
+	// First filter: Get "*.png ; PNG Images", "*.gd ; GDScript Files" from PackedStringArray.
+	regex.clear();
+	regex.compile(String("|").join(file_dialog_patterns));
+	Array results = regex.search_all(p_source_code);
+
+	Vector<String> temp;
+	_get_captured_strings(results, &temp);
+	String captured_strings = String(",").join(temp);
+
+	// Second filter: Get the texts after semicolon from "*.png ; PNG Images","*.gd ; GDScript Files".
+	String second_filter = "\"[^;]+;" + text + "\"";
+	regex.clear();
+	regex.compile(second_filter);
+	results = regex.search_all(captured_strings);
+	_get_captured_strings(results, r_output);
+	for (int i = 0; i < r_output->size(); i++) {
+		r_output->set(i, r_output->get(i).strip_edges());
+	}
+}
+
+void GDScriptEditorTranslationParserPlugin::_get_captured_strings(const Array &p_results, Vector<String> *r_output) {
+	Ref<RegExMatch> result;
+	for (int i = 0; i < p_results.size(); i++) {
+		result = p_results[i];
+		for (int j = 0; j < result->get_group_count(); j++) {
+			String s = result->get_string(j + 1);
+			// Prevent reading text with only spaces.
+			if (!s.strip_edges().empty()) {
+				r_output->push_back(s);
+			}
+		}
+	}
+}
+
+GDScriptEditorTranslationParserPlugin::GDScriptEditorTranslationParserPlugin() {
+	// Regex search pattern templates.
+	// The extra complication in the regex pattern is to ensure that the matching works when users write over multiple lines, use tabs etc.
+	const String dot = "\\.[\\s\\\\]*";
+	const String str_assign_template = "[\\s\\\\]*=[\\s\\\\]*\"" + text + "\"";
+	const String first_arg_template = "[\\s\\\\]*\\([\\s\\\\]*\"" + text + "\"[\\s\\S]*?\\)";
+	const String second_arg_template = "[\\s\\\\]*\\([\\s\\S]+?,[\\s\\\\]*\"" + text + "\"[\\s\\S]*?\\)";
+
+	// Common patterns.
+	patterns.push_back("tr" + first_arg_template);
+	patterns.push_back(dot + "text" + str_assign_template);
+	patterns.push_back(dot + "placeholder_text" + str_assign_template);
+	patterns.push_back(dot + "hint_tooltip" + str_assign_template);
+	patterns.push_back(dot + "set_text" + first_arg_template);
+	patterns.push_back(dot + "set_tooltip" + first_arg_template);
+	patterns.push_back(dot + "set_placeholder" + first_arg_template);
+
+	// Tabs and TabContainer API.
+	patterns.push_back(dot + "set_tab_title" + second_arg_template);
+	patterns.push_back(dot + "add_tab" + first_arg_template);
+
+	// PopupMenu API.
+	patterns.push_back(dot + "add_check_item" + first_arg_template);
+	patterns.push_back(dot + "add_icon_check_item" + second_arg_template);
+	patterns.push_back(dot + "add_icon_item" + second_arg_template);
+	patterns.push_back(dot + "add_icon_radio_check_item" + second_arg_template);
+	patterns.push_back(dot + "add_item" + first_arg_template);
+	patterns.push_back(dot + "add_multistate_item" + first_arg_template);
+	patterns.push_back(dot + "add_radio_check_item" + first_arg_template);
+	patterns.push_back(dot + "add_separator" + first_arg_template);
+	patterns.push_back(dot + "add_submenu_item" + first_arg_template);
+	patterns.push_back(dot + "set_item_text" + second_arg_template);
+	//patterns.push_back(dot + "set_item_tooltip" + second_arg_template); //no tr() behind this function. might be bug.
+
+	// FileDialog API - special case.
+	const String fd_text = "((?:[\\s\\\\]*\"(?:[^\"\\\\]|\\\\[\\s\\S])*(?:\"[\\s\\\\]*\\+[\\s\\\\]*\"(?:[^\"\\\\]|\\\\[\\s\\S])*)*\"[\\s\\\\]*,?)*)";
+	const String packed_string_array = "[\\s\\\\]*PackedStringArray[\\s\\\\]*\\([\\s\\\\]*\\[" + fd_text + "\\][\\s\\\\]*\\)";
+	file_dialog_patterns.push_back(dot + "add_filter[\\s\\\\]*\\(" + fd_text + "[\\s\\\\]*\\)");
+	file_dialog_patterns.push_back(dot + "filters[\\s\\\\]*=" + packed_string_array);
+	file_dialog_patterns.push_back(dot + "set_filters[\\s\\\\]*\\(" + packed_string_array + "[\\s\\\\]*\\)");
+}

modules/gdscript/editor/gdscript_translation_parser_plugin.h

@@ -0,0 +1,57 @@
+/*************************************************************************/
+/*  gdscript_translation_parser_plugin.h                                 */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GDSCRIPT_TRANSLATION_PARSER_PLUGIN_H
+#define GDSCRIPT_TRANSLATION_PARSER_PLUGIN_H
+
+#include "editor/editor_translation_parser.h"
+#include "modules/regex/regex.h"
+
+class GDScriptEditorTranslationParserPlugin : public EditorTranslationParserPlugin {
+	GDCLASS(GDScriptEditorTranslationParserPlugin, EditorTranslationParserPlugin);
+
+	// Regex and search patterns that are used to match translation strings.
+	const String text = "((?:[^\"\\\\]|\\\\[\\s\\S])*(?:\"[\\s\\\\]*\\+[\\s\\\\]*\"(?:[^\"\\\\]|\\\\[\\s\\S])*)*)";
+	RegEx regex;
+	Vector<String> patterns;
+	Vector<String> file_dialog_patterns;
+
+	void _parse_file_dialog(const String &p_source_code, Vector<String> *r_output);
+	void _get_captured_strings(const Array &p_results, Vector<String> *r_output);
+
+public:
+	virtual Error parse_file(const String &p_path, Vector<String> *r_extracted_strings);
+	virtual void parse_text(const String &p_text, Vector<String> *r_extracted_strings);
+	virtual void get_recognized_extensions(List<String> *r_extensions) const;
+
+	GDScriptEditorTranslationParserPlugin();
+};
+
+#endif // GDSCRIPT_TRANSLATION_PARSER_PLUGIN_H

modules/gdscript/register_types.cpp

@@ -46,7 +46,9 @@ Ref<ResourceFormatSaverGDScript> resource_saver_gd;
 #include "editor/editor_export.h"
 #include "editor/editor_node.h"
 #include "editor/editor_settings.h"
+#include "editor/editor_translation_parser.h"
 #include "editor/gdscript_highlighter.h"
+#include "editor/gdscript_translation_parser_plugin.h"
 
 #ifndef GDSCRIPT_NO_LSP
 #include "core/engine.h"
@@ -164,6 +166,10 @@ void register_gdscript_types() {
 #ifdef TOOLS_ENABLED
 	ScriptEditor::register_create_syntax_highlighter_function(GDScriptSyntaxHighlighter::create);
 	EditorNode::add_init_callback(_editor_init);
+
+	Ref<GDScriptEditorTranslationParserPlugin> gdscript_translation_parser_plugin;
+	gdscript_translation_parser_plugin.instance();
+	EditorTranslationParser::get_singleton()->add_parser(gdscript_translation_parser_plugin, EditorTranslationParser::STANDARD);
 #endif // TOOLS_ENABLED
 }