Parse C# script namespace and class

- Added a very simple parser that can extract the namespace and class name of a C# script.

modules/mono/editor/script_class_parser.h

@@ -0,0 +1,74 @@
+#ifndef SCRIPT_CLASS_PARSER_H
+#define SCRIPT_CLASS_PARSER_H
+
+#include "core/ustring.h"
+#include "core/variant.h"
+#include "core/vector.h"
+
+class ScriptClassParser {
+
+public:
+	struct NameDecl {
+		enum Type {
+			NAMESPACE_DECL,
+			CLASS_DECL,
+			STRUCT_DECL
+		};
+
+		String name;
+		Type type;
+	};
+
+	struct ClassDecl {
+		String name;
+		String namespace_;
+		Vector<String> base;
+		bool nested;
+		bool has_script_attr;
+	};
+
+private:
+	String code;
+	int idx;
+	int line;
+	String error_str;
+	bool error;
+	Variant value;
+
+	Vector<ClassDecl> classes;
+
+	enum Token {
+		TK_BRACKET_OPEN,
+		TK_BRACKET_CLOSE,
+		TK_CURLY_BRACKET_OPEN,
+		TK_CURLY_BRACKET_CLOSE,
+		TK_PERIOD,
+		TK_COLON,
+		TK_COMMA,
+		TK_SYMBOL,
+		TK_IDENTIFIER,
+		TK_STRING,
+		TK_NUMBER,
+		TK_OP_LESS,
+		TK_OP_GREATER,
+		TK_EOF,
+		TK_ERROR
+	};
+
+	Token get_token();
+
+	Error _skip_type_parameters();
+
+	Error _parse_class_base(Vector<String> &r_base);
+	Error _parse_namespace_name(String &r_name, int &r_curly_stack);
+
+public:
+	Error parse(const String &p_code);
+	Error parse_file(const String &p_filepath);
+
+	String get_error();
+
+	Vector<ClassDecl> get_classes();
+};
+
+#endif // SCRIPT_CLASS_PARSER_H