Add GDScript export hints for global filesystem and exponential ranges

- File in global filesystem: `String, FILE, GLOBAL, "*.png"`, tool scripts only
- Directory in global filesystem: `String, DIR, GLOBAL`, tool scripts only
- Exponential range: `float, EXP, 50, 150, 2`

modules/gdscript/gd_parser.cpp

@@ -2439,6 +2439,23 @@ void GDParser::_parse_class(ClassNode *p_class) {
 										break;
 									}
 
+									// range
+									if (tokenizer->get_token()==GDTokenizer::TK_IDENTIFIER && tokenizer->get_token_identifier()=="EXP") {
+
+										current_export.hint=PROPERTY_HINT_EXP_RANGE;
+										tokenizer->advance();
+
+										if (tokenizer->get_token()==GDTokenizer::TK_PARENTHESIS_CLOSE)
+											break;
+										else if (tokenizer->get_token()!=GDTokenizer::TK_COMMA) {
+											_set_error("Expected ')' or ',' in exponential range hint.");
+											return;
+										}
+										tokenizer->advance();
+									}
+									else
+										current_export.hint=PROPERTY_HINT_RANGE;
+
 									float sign=1.0;
 
 									if (tokenizer->get_token()==GDTokenizer::TK_OP_SUB) {
@@ -2452,8 +2469,6 @@ void GDParser::_parse_class(ClassNode *p_class) {
 										return;
 
 									}
-										//enumeration
-									current_export.hint=PROPERTY_HINT_RANGE;
 
 									current_export.hint_string=rtos(sign*double(tokenizer->get_token_constant()));
 									tokenizer->advance();
@@ -2556,10 +2571,32 @@ void GDParser::_parse_class(ClassNode *p_class) {
 
 									if (tokenizer->get_token()==GDTokenizer::TK_IDENTIFIER && tokenizer->get_token_identifier()=="DIR") {
 
-										current_export.hint=PROPERTY_HINT_DIR;
 										tokenizer->advance();
-										if (tokenizer->get_token()!=GDTokenizer::TK_PARENTHESIS_CLOSE) {
-											_set_error("Expected ')' in hint.");
+
+										if (tokenizer->get_token()==GDTokenizer::TK_PARENTHESIS_CLOSE)
+											current_export.hint=PROPERTY_HINT_DIR;
+										else if (tokenizer->get_token()==GDTokenizer::TK_COMMA ) {
+
+											tokenizer->advance();
+
+											if (tokenizer->get_token()!=GDTokenizer::TK_IDENTIFIER || !(tokenizer->get_token_identifier()=="GLOBAL")) {
+												_set_error("Expected 'GLOBAL' after comma in directory hint.");
+												return;
+											}
+											if (!p_class->tool) {
+												_set_error("Global filesystem hints may only be used in tool scripts.");
+												return;
+											}
+											current_export.hint=PROPERTY_HINT_GLOBAL_DIR;
+											tokenizer->advance();
+
+											if (tokenizer->get_token()!=GDTokenizer::TK_PARENTHESIS_CLOSE) {
+												_set_error("Expected ')' in hint.");
+												return;
+											}
+										}
+										else {
+											_set_error("Expected ')' or ',' in hint.");
 											return;
 										}
 										break;
@@ -2573,9 +2610,32 @@ void GDParser::_parse_class(ClassNode *p_class) {
 										if (tokenizer->get_token()==GDTokenizer::TK_COMMA) {
 
 											tokenizer->advance();
+
+											if (tokenizer->get_token()==GDTokenizer::TK_IDENTIFIER && tokenizer->get_token_identifier()=="GLOBAL") {
+
+												if (!p_class->tool) {
+													_set_error("Global filesystem hints may only be used in tool scripts.");
+													return;
+												}
+												current_export.hint=PROPERTY_HINT_GLOBAL_FILE;
+												tokenizer->advance();
+
+												if (tokenizer->get_token()==GDTokenizer::TK_PARENTHESIS_CLOSE)
+													break;
+												else if (tokenizer->get_token()==GDTokenizer::TK_COMMA)
+													tokenizer->advance();
+												else {
+													_set_error("Expected ')' or ',' in hint.");
+													return;
+												}
+											}
+
 											if (tokenizer->get_token()!=GDTokenizer::TK_CONSTANT || tokenizer->get_token_constant().get_type()!=Variant::STRING) {
 
-												_set_error("Expected string constant with filter");
+												if (current_export.hint==PROPERTY_HINT_GLOBAL_FILE)
+													_set_error("Expected string constant with filter");
+												else
+													_set_error("Expected 'GLOBAL' or string constant with filter");
 												return;
 											}
 											current_export.hint_string=tokenizer->get_token_constant();