Mono: support custom script templates.

Also fixes a bug that prevented methods like `duplicate()` from copying the source code. (Copied from GDScript implementation)

modules/mono/csharp_script.cpp

@@ -297,6 +297,20 @@ Ref<Script> CSharpLanguage::get_template(const String &p_class_name, const Strin
 	return script;
 }
 
+bool CSharpLanguage::is_using_templates() {
+
+	return true;
+}
+
+void CSharpLanguage::make_template(const String &p_class_name, const String &p_base_class_name, Ref<Script> &p_script) {
+
+	String src = p_script->get_source_code();
+	src = src.replace("%BASE%", p_base_class_name)
+				  .replace("%CLASS%", p_class_name)
+				  .replace("%TS%", _get_indentation());
+	p_script->set_source_code(src);
+}
+
 Script *CSharpLanguage::create_script() const {
 
 	return memnew(CSharpScript);
@@ -396,6 +410,25 @@ String CSharpLanguage::make_function(const String &p_class, const String &p_name
 #endif
 }
 
+String CSharpLanguage::_get_indentation() const {
+#ifdef TOOLS_ENABLED
+	if (Engine::get_singleton()->is_editor_hint()) {
+		bool use_space_indentation = EDITOR_DEF("text_editor/indent/type", 0);
+
+		if (use_space_indentation) {
+			int indent_size = EDITOR_DEF("text_editor/indent/size", 4);
+
+			String space_indent = "";
+			for (int i = 0; i < indent_size; i++) {
+				space_indent += " ";
+			}
+			return space_indent;
+		}
+	}
+#endif
+	return "\t";
+}
+
 void CSharpLanguage::frame() {
 
 	const Ref<MonoGCHandle> &task_scheduler_handle = GDMonoUtils::mono_cache.task_scheduler_handle;
@@ -1411,6 +1444,34 @@ void CSharpScript::_resource_path_changed() {
 	}
 }
 
+bool CSharpScript::_get(const StringName &p_name, Variant &r_ret) const {
+
+	if (p_name == CSharpLanguage::singleton->string_names._script_source) {
+
+		r_ret = get_source_code();
+		return true;
+	}
+
+	return false;
+}
+
+bool CSharpScript::_set(const StringName &p_name, const Variant &p_value) {
+
+	if (p_name == CSharpLanguage::singleton->string_names._script_source) {
+
+		set_source_code(p_value);
+		reload();
+		return true;
+	}
+
+	return false;
+}
+
+void CSharpScript::_get_property_list(List<PropertyInfo> *p_properties) const {
+
+	p_properties->push_back(PropertyInfo(Variant::STRING, CSharpLanguage::singleton->string_names._script_source, PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR));
+}
+
 void CSharpScript::_bind_methods() {
 
 	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &CSharpScript::_new, MethodInfo(Variant::OBJECT, "new"));
@@ -1984,5 +2045,6 @@ CSharpLanguage::StringNameCache::StringNameCache() {
 	_set = StaticCString::create("_set");
 	_get = StaticCString::create("_get");
 	_notification = StaticCString::create("_notification");
+	_script_source = StaticCString::create("script/source");
 	dotctor = StaticCString::create(".ctor");
 }

modules/mono/csharp_script.h

@@ -116,6 +116,9 @@ protected:
 
 	Variant call(const StringName &p_method, const Variant **p_args, int p_argcount, Variant::CallError &r_error);
 	virtual void _resource_path_changed();
+	bool _get(const StringName &p_name, Variant &r_ret) const;
+	bool _set(const StringName &p_name, const Variant &p_value);
+	void _get_property_list(List<PropertyInfo> *p_properties) const;
 
 public:
 	virtual bool can_instance() const;
@@ -228,16 +231,17 @@ class CSharpLanguage : public ScriptLanguage {
 		StringName _set;
 		StringName _get;
 		StringName _notification;
+		StringName _script_source;
 		StringName dotctor; // .ctor
 
 		StringNameCache();
 	};
 
-	StringNameCache string_names;
-
 	int lang_idx;
 
 public:
+	StringNameCache string_names;
+
 	_FORCE_INLINE_ int get_language_index() { return lang_idx; }
 	void set_language_index(int p_idx);
 
@@ -266,6 +270,8 @@ public:
 	virtual void get_comment_delimiters(List<String> *p_delimiters) const;
 	virtual void get_string_delimiters(List<String> *p_delimiters) const;
 	virtual Ref<Script> get_template(const String &p_class_name, const String &p_base_class_name) const;
+	virtual bool is_using_templates();
+	virtual void make_template(const String &p_class_name, const String &p_base_class_name, Ref<Script> &p_script);
 	/* TODO */ virtual bool validate(const String &p_script, int &r_line_error, int &r_col_error, String &r_test_error, const String &p_path, List<String> *r_functions) const { return true; }
 	virtual Script *create_script() const;
 	virtual bool has_named_classes() const;
@@ -273,6 +279,7 @@ public:
 	/* TODO? */ virtual int find_function(const String &p_function, const String &p_code) const { return -1; }
 	virtual String make_function(const String &p_class, const String &p_name, const PoolStringArray &p_args) const;
 	/* TODO? */ Error complete_code(const String &p_code, const String &p_base_path, Object *p_owner, List<String> *r_options, String &r_call_hint) { return ERR_UNAVAILABLE; }
+	virtual String _get_indentation() const;
 	/* TODO? */ virtual void auto_indent_code(String &p_code, int p_from_line, int p_to_line) const {}
 	/* TODO */ virtual void add_global_constant(const StringName &p_variable, const Variant &p_value) {}