GDScript: add this_class keyword

Author: ChibiDenDen

core/math/expression.cpp

@@ -1222,6 +1222,8 @@ Error Expression::_get_token(Token &r_token) {
 						r_token.type = TK_OP_AND;
 					} else if (id == "self") {
 						r_token.type = TK_SELF;
+					} else if (id == "this_class") {
+						r_token.type = TK_THIS_CLASS;
 					} else {
 
 						for (int i = 0; i < Variant::VARIANT_MAX; i++) {
@@ -1485,6 +1487,11 @@ Expression::ENode *Expression::_parse_expression() {
 				SelfNode *self = alloc_node<SelfNode>();
 				expr = self;
 			} break;
+			case TK_THIS_CLASS: {
+
+				ThisClassNode *this_class = alloc_node<ThisClassNode>();
+				expr = this_class;
+			} break;
 			case TK_CONSTANT: {
 				ConstantNode *constant = alloc_node<ConstantNode>();
 				constant->value = tk.value;
@@ -1959,6 +1966,14 @@ bool Expression::_execute(const Array &p_inputs, Object *p_instance, Expression:
 			}
 			r_ret = p_instance;
 		} break;
+		case Expression::ENode::TYPE_THIS_CLASS: {
+
+			if (!p_instance) {
+				r_error_str = RTR("this_class can't be used because instance is null (not passed)");
+				return true;
+			}
+			r_ret = p_instance->get_class();
+		} break;
 		case Expression::ENode::TYPE_OPERATOR: {
 
 			const Expression::OperatorNode *op = static_cast<const Expression::OperatorNode *>(p_node);

core/math/expression.h

@@ -149,6 +149,7 @@ class Expression : public Reference {
 		TK_IDENTIFIER,
 		TK_BUILTIN_FUNC,
 		TK_SELF,
+		TK_THIS_CLASS,
 		TK_CONSTANT,
 		TK_BASIC_TYPE,
 		TK_COLON,
@@ -206,6 +207,7 @@ class Expression : public Reference {
 			TYPE_INPUT,
 			TYPE_CONSTANT,
 			TYPE_SELF,
+			TYPE_THIS_CLASS,
 			TYPE_OPERATOR,
 			TYPE_INDEX,
 			TYPE_NAMED_INDEX,
@@ -273,6 +275,13 @@ class Expression : public Reference {
 		}
 	};
 
+	struct ThisClassNode : public ENode {
+
+		ThisClassNode() {
+			type = TYPE_THIS_CLASS;
+		}
+	};
+
 	struct IndexNode : public ENode {
 		ENode *base;
 		ENode *index;

modules/gdscript/gdscript_compiler.cpp

@@ -391,6 +391,10 @@ int GDScriptCompiler::_parse_expression(CodeGen &codegen, const GDScriptParser::
 			}
 			return (GDScriptFunction::ADDR_TYPE_SELF << GDScriptFunction::ADDR_BITS);
 		} break;
+		case GDScriptParser::Node::TYPE_THIS_CLASS: {
+			//return constant
+			return (GDScriptFunction::ADDR_TYPE_CLASS << GDScriptFunction::ADDR_BITS);
+		} break;
 		case GDScriptParser::Node::TYPE_ARRAY: {
 
 			const GDScriptParser::ArrayNode *an = static_cast<const GDScriptParser::ArrayNode *>(p_expression);

modules/gdscript/gdscript_parser.cpp

@@ -616,6 +616,11 @@ GDScriptParser::Node *GDScriptParser::_parse_expression(Node *p_parent, bool p_s
 			SelfNode *self = alloc_node<SelfNode>();
 			tokenizer->advance();
 			expr = self;
+		} else if (tokenizer->get_token() == GDScriptTokenizer::TK_THIS_CLASS) {
+			//constant defined by tokenizer
+			ThisClassNode *this_class = alloc_node<ThisClassNode>();
+			tokenizer->advance();
+			expr = this_class;
 		} else if (tokenizer->get_token() == GDScriptTokenizer::TK_BUILT_IN_TYPE && tokenizer->get_token(1) == GDScriptTokenizer::TK_PERIOD) {
 
 			Variant::Type bi_type = tokenizer->get_token_type();
@@ -5576,6 +5581,10 @@ bool GDScriptParser::_parse_type(DataType &r_type, bool p_can_be_void) {
 				full_name = r_type.native_type;
 			}
 		} break;
+		case GDScriptTokenizer::TK_THIS_CLASS: {
+			r_type.kind = DataType::CLASS;
+			r_type.class_type = current_class;
+		} break;
 		default: {
 			return false;
 		}

modules/gdscript/gdscript_parser.h

@@ -118,6 +118,7 @@ class GDScriptParser {
 			TYPE_ARRAY,
 			TYPE_DICTIONARY,
 			TYPE_SELF,
+			TYPE_THIS_CLASS,
 			TYPE_OPERATOR,
 			TYPE_CONTROL_FLOW,
 			TYPE_LOCAL_VAR,
@@ -345,6 +346,10 @@ class GDScriptParser {
 		SelfNode() { type = TYPE_SELF; }
 	};
 
+	struct ThisClassNode : public Node {
+		ThisClassNode() { type = TYPE_THIS_CLASS; }
+	};
+
 	struct OperatorNode : public Node {
 		enum Operator {
 			//call/constructor operator

modules/gdscript/gdscript_tokenizer.cpp

@@ -227,6 +227,7 @@ static const _kws _keyword_list[] = {
 	{ GDScriptTokenizer::TK_CF_MATCH, "match" },
 	{ GDScriptTokenizer::TK_CF_PASS, "pass" },
 	{ GDScriptTokenizer::TK_SELF, "self" },
+	{ GDScriptTokenizer::TK_THIS_CLASS, "this_class" },
 	{ GDScriptTokenizer::TK_CONST_PI, "PI" },
 	{ GDScriptTokenizer::TK_CONST_TAU, "TAU" },
 	{ GDScriptTokenizer::TK_WILDCARD, "_" },
@@ -291,6 +292,7 @@ bool GDScriptTokenizer::is_token_literal(int p_offset, bool variable_safe) const
 		case TK_CF_MATCH:
 		case TK_CF_PASS:
 		case TK_SELF:
+		case TK_THIS_CLASS:
 		case TK_CONST_PI:
 		case TK_CONST_TAU:
 		case TK_WILDCARD:

modules/gdscript/gdscript_tokenizer.h

@@ -46,6 +46,7 @@ class GDScriptTokenizer {
 		TK_IDENTIFIER,
 		TK_CONSTANT,
 		TK_SELF,
+		TK_THIS_CLASS,
 		TK_BUILT_IN_TYPE,
 		TK_BUILT_IN_FUNC,
 		TK_OP_IN,