Parse C# script namespace and class

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

9 files changed, 759 insertions, 9 deletions

diff --git a/modules/mono/editor/GodotSharpTools/Project/ProjectUtils.cs b/modules/mono/editor/GodotSharpTools/Project/ProjectUtils.cs
index 6889ea715f..a13f4fd6ef 100644
--- a/modules/mono/editor/GodotSharpTools/Project/ProjectUtils.cs
+++ b/modules/mono/editor/GodotSharpTools/Project/ProjectUtils.cs
@@ -1,5 +1,6 @@
-using System;
+using System.Collections.Generic;
 using System.IO;
+using DotNet.Globbing;
 using Microsoft.Build.Construction;
 
 namespace GodotSharpTools.Project
@@ -10,8 +11,61 @@ namespace GodotSharpTools.Project
         {
             var dir = Directory.GetParent(projectPath).FullName;
             var root = ProjectRootElement.Open(projectPath);
-            if (root.AddItemChecked(itemType, include.RelativeToPath(dir).Replace("/", "\\")))
+            var normalizedInclude = include.RelativeToPath(dir).Replace("/", "\\");
+
+            if (root.AddItemChecked(itemType, normalizedInclude))
                 root.Save();
         }
+
+        private static string[] GetAllFilesRecursive(string rootDirectory, string mask)
+        {
+            string[] files = Directory.GetFiles(rootDirectory, mask, SearchOption.AllDirectories);
+
+            // We want relative paths
+            for (int i = 0; i < files.Length; i++) {
+                files[i] = files[i].RelativeToPath(rootDirectory);
+            }
+
+            return files;
+        }
+
+        public static string[] GetIncludeFiles(string projectPath, string itemType)
+        {
+            var result = new List<string>();
+            var existingFiles = GetAllFilesRecursive(Path.GetDirectoryName(projectPath), "*.cs");
+
+            GlobOptions globOptions = new GlobOptions();
+            globOptions.Evaluation.CaseInsensitive = false;
+
+            var root = ProjectRootElement.Open(projectPath);
+
+            foreach (var itemGroup in root.ItemGroups)
+            {
+                if (itemGroup.Condition.Length != 0)
+                    continue;
+
+                foreach (var item in itemGroup.Items)
+                {
+                    if (item.ItemType != itemType)
+                        continue;
+
+                    string normalizedInclude = item.Include.NormalizePath();
+
+                    var glob = Glob.Parse(normalizedInclude, globOptions);
+
+                    // TODO Check somehow if path has no blog to avoid the following loop...
+
+                    foreach (var existingFile in existingFiles)
+                    {
+                        if (glob.IsMatch(existingFile))
+                        {
+                            result.Add(existingFile);
+                        }
+                    }
+                }
+            }
+
+            return result.ToArray();
+        }
     }
 }
diff --git a/modules/mono/editor/csharp_project.cpp b/modules/mono/editor/csharp_project.cpp
index 6f223b75a3..03db765c2e 100644
--- a/modules/mono/editor/csharp_project.cpp
+++ b/modules/mono/editor/csharp_project.cpp
@@ -30,11 +30,15 @@
 
 #include "csharp_project.h"
 
+#include "core/io/json.h"
 #include "core/os/os.h"
 #include "core/project_settings.h"
 
+#include "../csharp_script.h"
 #include "../mono_gd/gd_mono_class.h"
 #include "../mono_gd/gd_mono_marshal.h"
+#include "../utils/string_utils.h"
+#include "script_class_parser.h"
 
 namespace CSharpProject {
 
@@ -118,4 +122,109 @@ void add_item(const String &p_project_path, const String &p_item_type, const Str
 		ERR_FAIL();
 	}
 }
+
+Error generate_scripts_metadata(const String &p_project_path, const String &p_output_path) {
+
+	_GDMONO_SCOPE_DOMAIN_(TOOLS_DOMAIN)
+
+	GDMonoClass *project_utils = GDMono::get_singleton()->get_editor_tools_assembly()->get_class("GodotSharpTools.Project", "ProjectUtils");
+
+	void *args[2] = {
+		GDMonoMarshal::mono_string_from_godot(p_project_path),
+		GDMonoMarshal::mono_string_from_godot("Compile")
+	};
+
+	MonoException *exc = NULL;
+	MonoArray *ret = (MonoArray *)project_utils->get_method("GetIncludeFiles", 2)->invoke_raw(NULL, args, &exc);
+
+	if (exc) {
+		GDMonoUtils::debug_print_unhandled_exception(exc);
+		ERR_FAIL_V(FAILED);
+	}
+
+	PoolStringArray project_files = GDMonoMarshal::mono_array_to_PoolStringArray(ret);
+	PoolStringArray::Read r = project_files.read();
+
+	Dictionary old_dict = CSharpLanguage::get_singleton()->get_scripts_metadata();
+	Dictionary new_dict;
+
+	for (int i = 0; i < project_files.size(); i++) {
+		const String &project_file = ("res://" + r[i]).simplify_path();
+
+		uint64_t modified_time = FileAccess::get_modified_time(project_file);
+
+		const Variant *old_file_var = old_dict.getptr(project_file);
+		if (old_file_var) {
+			Dictionary old_file_dict = old_file_var->operator Dictionary();
+
+			if (old_file_dict["modified_time"].operator uint64_t() == modified_time) {
+				// No changes so no need to parse again
+				new_dict[project_file] = old_file_dict;
+				continue;
+			}
+		}
+
+		ScriptClassParser scp;
+		Error err = scp.parse_file(project_file);
+		if (err != OK) {
+			ERR_EXPLAIN("Failed to determine namespace and class for script: " + project_file);
+			ERR_FAIL_V(err);
+		}
+
+		Vector<ScriptClassParser::ClassDecl> classes = scp.get_classes();
+
+		bool found = false;
+		Dictionary class_dict;
+
+		String search_name = project_file.get_file().get_basename();
+
+		for (int j = 0; j < classes.size(); j++) {
+			const ScriptClassParser::ClassDecl &class_decl = classes[j];
+
+			if (class_decl.base.size() == 0)
+				continue; // Does not inherit nor implement anything, so it can't be a script class
+
+			String class_cmp;
+
+			if (class_decl.nested) {
+				class_cmp = class_decl.name.get_slice(".", class_decl.name.get_slice_count(".") - 1);
+			} else {
+				class_cmp = class_decl.name;
+			}
+
+			if (class_cmp != search_name)
+				continue;
+
+			class_dict["namespace"] = class_decl.namespace_;
+			class_dict["class_name"] = class_decl.name;
+			class_dict["nested"] = class_decl.nested;
+
+			found = true;
+			break;
+		}
+
+		if (found) {
+			Dictionary file_dict;
+			file_dict["modified_time"] = modified_time;
+			file_dict["class"] = class_dict;
+			new_dict[project_file] = file_dict;
+		}
+	}
+
+	if (new_dict.size()) {
+		String json = JSON::print(new_dict, "", false);
+
+		Error ferr;
+		FileAccess *f = FileAccess::open(p_output_path, FileAccess::WRITE, &ferr);
+		ERR_EXPLAIN("Cannot open file for writing: " + p_output_path);
+		ERR_FAIL_COND_V(ferr != OK, ferr);
+		f->store_string(json);
+		f->flush();
+		f->close();
+		memdelete(f);
+	}
+
+	return OK;
+}
+
 } // namespace CSharpProject
diff --git a/modules/mono/editor/csharp_project.h b/modules/mono/editor/csharp_project.h
index d852139de0..aeeeff50f0 100644
--- a/modules/mono/editor/csharp_project.h
+++ b/modules/mono/editor/csharp_project.h
@@ -40,6 +40,9 @@ String generate_editor_api_project(const String &p_dir, const String &p_core_dll
 String generate_game_project(const String &p_dir, const String &p_name, const Vector<String> &p_files = Vector<String>());
 
 void add_item(const String &p_project_path, const String &p_item_type, const String &p_include);
+
+Error generate_scripts_metadata(const String &p_project_path, const String &p_output_path);
+
 } // namespace CSharpProject
 
 #endif // CSHARP_PROJECT_H
diff --git a/modules/mono/editor/godotsharp_builds.cpp b/modules/mono/editor/godotsharp_builds.cpp
index b504cfe712..6216213716 100644
--- a/modules/mono/editor/godotsharp_builds.cpp
+++ b/modules/mono/editor/godotsharp_builds.cpp
@@ -39,6 +39,7 @@
 #include "../mono_gd/gd_mono_marshal.h"
 #include "../utils/path_utils.h"
 #include "bindings_generator.h"
+#include "csharp_project.h"
 #include "godotsharp_editor.h"
 
 #define PROP_NAME_MSBUILD_MONO "MSBuild (Mono)"
@@ -268,7 +269,7 @@ bool GodotSharpBuilds::copy_api_assembly(const String &p_src_dir, const String &
 	if (!FileAccess::exists(assembly_dst) ||
 			FileAccess::get_modified_time(assembly_src) > FileAccess::get_modified_time(assembly_dst) ||
 			GDMono::get_singleton()->metadata_is_api_assembly_invalidated(p_api_type)) {
-		DirAccess *da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
+		DirAccessRef da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
 
 		String xml_file = p_assembly_name + ".xml";
 		if (da->copy(p_src_dir.plus_file(xml_file), p_dst_dir.plus_file(xml_file)) != OK)
@@ -280,8 +281,6 @@ bool GodotSharpBuilds::copy_api_assembly(const String &p_src_dir, const String &
 
 		Error err = da->copy(assembly_src, assembly_dst);
 
-		memdelete(da);
-
 		if (err != OK) {
 			show_build_error_dialog("Failed to copy " + assembly_file);
 			return false;
@@ -398,6 +397,18 @@ bool GodotSharpBuilds::build_project_blocking(const String &p_config) {
 
 bool GodotSharpBuilds::editor_build_callback() {
 
+	String scripts_metadata_path_editor = GodotSharpDirs::get_res_metadata_dir().plus_file("scripts_metadata.editor");
+	String scripts_metadata_path_player = GodotSharpDirs::get_res_metadata_dir().plus_file("scripts_metadata.editor_player");
+
+	Error metadata_err = CSharpProject::generate_scripts_metadata(GodotSharpDirs::get_project_csproj_path(), scripts_metadata_path_editor);
+	ERR_FAIL_COND_V(metadata_err != OK, false);
+
+	DirAccessRef da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
+	Error copy_err = da->copy(scripts_metadata_path_editor, scripts_metadata_path_player);
+
+	ERR_EXPLAIN("Failed to copy scripts metadata file");
+	ERR_FAIL_COND_V(copy_err != OK, false);
+
 	return build_project_blocking("Tools");
 }
 
diff --git a/modules/mono/editor/godotsharp_export.cpp b/modules/mono/editor/godotsharp_export.cpp
index 1e43bcf518..509ec961fb 100644
--- a/modules/mono/editor/godotsharp_export.cpp
+++ b/modules/mono/editor/godotsharp_export.cpp
@@ -37,6 +37,7 @@
 #include "../godotsharp_dirs.h"
 #include "../mono_gd/gd_mono_class.h"
 #include "../mono_gd/gd_mono_marshal.h"
+#include "csharp_project.h"
 #include "godotsharp_builds.h"
 
 static MonoString *godot_icall_GodotSharpExport_GetTemplatesDir() {
@@ -86,6 +87,12 @@ void GodotSharpExport::_export_begin(const Set<String> &p_features, bool p_debug
 
 	String build_config = p_debug ? "Debug" : "Release";
 
+	String scripts_metadata_path = GodotSharpDirs::get_res_metadata_dir().plus_file("scripts_metadata." + String(p_debug ? "debug" : "release"));
+	Error metadata_err = CSharpProject::generate_scripts_metadata(GodotSharpDirs::get_project_csproj_path(), scripts_metadata_path);
+	ERR_FAIL_COND(metadata_err != OK);
+
+	ERR_FAIL_COND(!_add_file(scripts_metadata_path, scripts_metadata_path));
+
 	ERR_FAIL_COND(!GodotSharpBuilds::build_project_blocking(build_config));
 
 	// Add dependency assemblies
@@ -124,7 +131,7 @@ void GodotSharpExport::_export_begin(const Set<String> &p_features, bool p_debug
 	for (Map<String, String>::Element *E = dependencies.front(); E; E = E->next()) {
 		String depend_src_path = E->value();
 		String depend_dst_path = GodotSharpDirs::get_res_assemblies_dir().plus_file(depend_src_path.get_file());
-		ERR_FAIL_COND(!_add_assembly(depend_src_path, depend_dst_path));
+		ERR_FAIL_COND(!_add_file(depend_src_path, depend_dst_path));
 	}
 
 	// Mono specific export template extras (data dir)
@@ -155,7 +162,7 @@ void GodotSharpExport::_export_begin(const Set<String> &p_features, bool p_debug
 	}
 }
 
-bool GodotSharpExport::_add_assembly(const String &p_src_path, const String &p_dst_path) {
+bool GodotSharpExport::_add_file(const String &p_src_path, const String &p_dst_path, bool p_remap) {
 
 	FileAccessRef f = FileAccess::open(p_src_path, FileAccess::READ);
 	ERR_FAIL_COND_V(!f, false);
@@ -164,7 +171,7 @@ bool GodotSharpExport::_add_assembly(const String &p_src_path, const String &p_d
 	data.resize(f->get_len());
 	f->get_buffer(data.ptrw(), data.size());
 
-	add_file(p_dst_path, data, false);
+	add_file(p_dst_path, data, p_remap);
 
 	return true;
 }
diff --git a/modules/mono/editor/godotsharp_export.h b/modules/mono/editor/godotsharp_export.h
index f007016578..10d4375567 100644
--- a/modules/mono/editor/godotsharp_export.h
+++ b/modules/mono/editor/godotsharp_export.h
@@ -41,7 +41,7 @@ class GodotSharpExport : public EditorExportPlugin {
 
 	MonoAssemblyName *aname_prealloc;
 
-	bool _add_assembly(const String &p_src_path, const String &p_dst_path);
+	bool _add_file(const String &p_src_path, const String &p_dst_path, bool p_remap = false);
 
 	Error _get_assembly_dependencies(GDMonoAssembly *p_assembly, const Vector<String> &p_search_dirs, Map<String, String> &r_dependencies);
 
diff --git a/modules/mono/editor/mono_bottom_panel.cpp b/modules/mono/editor/mono_bottom_panel.cpp
index 0ac59a1be8..d7bfa54aba 100644
--- a/modules/mono/editor/mono_bottom_panel.cpp
+++ b/modules/mono/editor/mono_bottom_panel.cpp
@@ -31,6 +31,8 @@
 #include "mono_bottom_panel.h"
 
 #include "../csharp_script.h"
+#include "../godotsharp_dirs.h"
+#include "csharp_project.h"
 #include "godotsharp_editor.h"
 
 MonoBottomPanel *MonoBottomPanel::singleton = NULL;
@@ -148,6 +150,10 @@ void MonoBottomPanel::_errors_toggled(bool p_pressed) {
 
 void MonoBottomPanel::_build_project_pressed() {
 
+	String scripts_metadata_path = GodotSharpDirs::get_res_metadata_dir().plus_file("scripts_metadata.editor");
+	Error metadata_err = CSharpProject::generate_scripts_metadata(GodotSharpDirs::get_project_csproj_path(), scripts_metadata_path);
+	ERR_FAIL_COND(metadata_err != OK);
+
 	GodotSharpBuilds::get_singleton()->build_project_blocking("Tools");
 
 	MonoReloadNode::get_singleton()->restart_reload_timer();
diff --git a/modules/mono/editor/script_class_parser.cpp b/modules/mono/editor/script_class_parser.cpp
new file mode 100644
index 0000000000..43de8df2b2
--- /dev/null
+++ b/modules/mono/editor/script_class_parser.cpp
@@ -0,0 +1,486 @@
+#include "script_class_parser.h"
+
+#include "core/map.h"
+#include "core/os/os.h"
+
+#include "../utils/string_utils.h"
+
+ScriptClassParser::Token ScriptClassParser::get_token() {
+
+	while (true) {
+		switch (code[idx]) {
+			case '\n': {
+				line++;
+				idx++;
+				break;
+			};
+			case 0: {
+				return TK_EOF;
+			} break;
+			case '{': {
+				idx++;
+				return TK_CURLY_BRACKET_OPEN;
+			};
+			case '}': {
+				idx++;
+				return TK_CURLY_BRACKET_CLOSE;
+			};
+			case '[': {
+				idx++;
+				return TK_BRACKET_OPEN;
+			};
+			case ']': {
+				idx++;
+				return TK_BRACKET_CLOSE;
+			};
+			case '<': {
+				idx++;
+				return TK_OP_LESS;
+			};
+			case '>': {
+				idx++;
+				return TK_OP_GREATER;
+			};
+			case ':': {
+				idx++;
+				return TK_COLON;
+			};
+			case ',': {
+				idx++;
+				return TK_COMMA;
+			};
+			case '.': {
+				idx++;
+				return TK_PERIOD;
+			};
+			case '#': {
+				//compiler directive
+				while (code[idx] != '\n' && code[idx] != 0) {
+					idx++;
+				}
+				continue;
+			} break;
+			case '/': {
+				switch (code[idx + 1]) {
+					case '*': { // block comment
+						idx += 2;
+						while (true) {
+							if (code[idx] == 0) {
+								error_str = "Unterminated comment";
+								error = true;
+								return TK_ERROR;
+							} else if (code[idx] == '*' && code[idx + 1] == '/') {
+								idx += 2;
+								break;
+							} else if (code[idx] == '\n') {
+								line++;
+							}
+
+							idx++;
+						}
+
+					} break;
+					case '/': { // line comment skip
+						while (code[idx] != '\n' && code[idx] != 0) {
+							idx++;
+						}
+
+					} break;
+					default: {
+						value = "/";
+						idx++;
+						return TK_SYMBOL;
+					}
+				}
+
+				continue; // a comment
+			} break;
+			case '\'':
+			case '"': {
+				bool verbatim = idx != 0 && code[idx - 1] == '@';
+
+				CharType begin_str = code[idx];
+				idx++;
+				String tk_string = String();
+				while (true) {
+					if (code[idx] == 0) {
+						error_str = "Unterminated String";
+						error = true;
+						return TK_ERROR;
+					} else if (code[idx] == begin_str) {
+						if (verbatim && code[idx + 1] == '"') { // `""` is verbatim string's `\"`
+							idx += 2; // skip next `"` as well
+							continue;
+						}
+
+						idx += 1;
+						break;
+					} else if (code[idx] == '\\' && !verbatim) {
+						//escaped characters...
+						idx++;
+						CharType next = code[idx];
+						if (next == 0) {
+							error_str = "Unterminated String";
+							error = true;
+							return TK_ERROR;
+						}
+						CharType res = 0;
+
+						switch (next) {
+							case 'b': res = 8; break;
+							case 't': res = 9; break;
+							case 'n': res = 10; break;
+							case 'f': res = 12; break;
+							case 'r':
+								res = 13;
+								break;
+							case '\"': res = '\"'; break;
+							case '\\':
+								res = '\\';
+								break;
+							default: {
+								res = next;
+							} break;
+						}
+
+						tk_string += res;
+
+					} else {
+						if (code[idx] == '\n')
+							line++;
+						tk_string += code[idx];
+					}
+					idx++;
+				}
+
+				value = tk_string;
+
+				return TK_STRING;
+			} break;
+			default: {
+				if (code[idx] <= 32) {
+					idx++;
+					break;
+				}
+
+				if ((code[idx] >= 33 && code[idx] <= 47) || (code[idx] >= 58 && code[idx] <= 63) || (code[idx] >= 91 && code[idx] <= 94) || code[idx] == 96 || (code[idx] >= 123 && code[idx] <= 127)) {
+					value = String::chr(code[idx]);
+					idx++;
+					return TK_SYMBOL;
+				}
+
+				if (code[idx] == '-' || (code[idx] >= '0' && code[idx] <= '9')) {
+					//a number
+					const CharType *rptr;
+					double number = String::to_double(&code[idx], &rptr);
+					idx += (rptr - &code[idx]);
+					value = number;
+					return TK_NUMBER;
+
+				} else if ((code[idx] == '@' && code[idx + 1] != '"') || code[idx] == '_' || (code[idx] >= 'A' && code[idx] <= 'Z') || (code[idx] >= 'a' && code[idx] <= 'z') || code[idx] > 127) {
+					String id;
+
+					id += code[idx];
+					idx++;
+
+					while (code[idx] == '_' || (code[idx] >= 'A' && code[idx] <= 'Z') || (code[idx] >= 'a' && code[idx] <= 'z') || (code[idx] >= '0' && code[idx] <= '9') || code[idx] > 127) {
+						id += code[idx];
+						idx++;
+					}
+
+					value = id;
+					return TK_IDENTIFIER;
+				} else if (code[idx] == '@' && code[idx + 1] == '"') {
+					// begin of verbatim string
+					idx++;
+				} else {
+					error_str = "Unexpected character.";
+					error = true;
+					return TK_ERROR;
+				}
+			}
+		}
+	}
+}
+
+Error ScriptClassParser::_skip_type_parameters() {
+
+	Token tk;
+
+	while (true) {
+		tk = get_token();
+
+		if (tk == TK_IDENTIFIER) {
+			tk = get_token();
+
+			if (tk == TK_OP_LESS) {
+				Error err = _skip_type_parameters();
+				if (err)
+					return err;
+				continue;
+			} else if (tk != TK_COMMA) {
+				error_str = "Unexpected token: " + itos(tk);
+				error = true;
+				return ERR_PARSE_ERROR;
+			}
+		} else if (tk == TK_OP_LESS) {
+			error_str = "Expected identifier before `<`.";
+			error = true;
+			return ERR_PARSE_ERROR;
+		} else if (tk == TK_OP_GREATER) {
+			return OK;
+		} else {
+			error_str = "Unexpected token: " + itos(tk);
+			error = true;
+			return ERR_PARSE_ERROR;
+		}
+	}
+}
+
+Error ScriptClassParser::_parse_class_base(Vector<String> &r_base) {
+
+	Token tk;
+
+	while (true) {
+		tk = get_token();
+
+		if (tk == TK_IDENTIFIER) {
+			bool generic = false;
+
+			String name = value;
+
+			tk = get_token();
+
+			if (tk == TK_OP_LESS) {
+				generic = true;
+				Error err = _skip_type_parameters();
+				if (err)
+					return err;
+			} else if (tk == TK_COMMA) {
+				Error err = _parse_class_base(r_base);
+				if (err)
+					return err;
+			} else if (tk != TK_CURLY_BRACKET_OPEN) {
+				error_str = "Unexpected token: " + itos(tk);
+				error = true;
+				return ERR_PARSE_ERROR;
+			}
+
+			r_base.push_back(!generic ? name : String()); // no generics, please
+
+			return OK;
+		} else {
+			error_str = "Unexpected token: " + itos(tk);
+			error = true;
+			return ERR_PARSE_ERROR;
+		}
+	}
+}
+
+Error ScriptClassParser::_parse_namespace_name(String &r_name, int &r_curly_stack) {
+
+	Token tk = get_token();
+
+	if (tk == TK_IDENTIFIER) {
+		r_name += String(value);
+	} else {
+		error_str = "Unexpected token: " + itos(tk);
+		error = true;
+		return ERR_PARSE_ERROR;
+	}
+
+	tk = get_token();
+
+	if (tk == TK_PERIOD) {
+		r_name += ".";
+		return _parse_namespace_name(r_name, r_curly_stack);
+	} else if (tk == TK_CURLY_BRACKET_OPEN) {
+		r_curly_stack++;
+		return OK;
+	} else {
+		error_str = "Unexpected token: " + itos(tk);
+		error = true;
+		return ERR_PARSE_ERROR;
+	}
+}
+
+Error ScriptClassParser::parse(const String &p_code) {
+
+	code = p_code;
+	idx = 0;
+	line = 0;
+	error_str = String();
+	error = false;
+	value = Variant();
+	classes.clear();
+
+	Token tk = get_token();
+
+	Map<int, NameDecl> name_stack;
+	int curly_stack = 0;
+	int type_curly_stack = 0;
+
+	while (!error && tk != TK_EOF) {
+		if (tk == TK_IDENTIFIER && String(value) == "class") {
+			tk = get_token();
+
+			if (tk == TK_IDENTIFIER) {
+				String name = value;
+				int at_level = type_curly_stack;
+
+				ClassDecl class_decl;
+
+				for (Map<int, NameDecl>::Element *E = name_stack.front(); E; E = E->next()) {
+					const NameDecl &name_decl = E->value();
+
+					if (name_decl.type == NameDecl::NAMESPACE_DECL) {
+						if (E != name_stack.front())
+							class_decl.namespace_ += ".";
+						class_decl.namespace_ += name_decl.name;
+					} else {
+						class_decl.name += name_decl.name + ".";
+					}
+				}
+
+				class_decl.name += name;
+				class_decl.nested = type_curly_stack > 0;
+
+				bool generic = false;
+
+				while (true) {
+					tk = get_token();
+
+					if (tk == TK_COLON) {
+						Error err = _parse_class_base(class_decl.base);
+						if (err)
+							return err;
+
+						curly_stack++;
+						type_curly_stack++;
+
+						break;
+					} else if (tk == TK_CURLY_BRACKET_OPEN) {
+						curly_stack++;
+						type_curly_stack++;
+						break;
+					} else if (tk == TK_OP_LESS && !generic) {
+						generic = true;
+
+						Error err = _skip_type_parameters();
+						if (err)
+							return err;
+					} else {
+						error_str = "Unexpected token: " + itos(tk);
+						error = true;
+						return ERR_PARSE_ERROR;
+					}
+				}
+
+				NameDecl name_decl;
+				name_decl.name = name;
+				name_decl.type = NameDecl::CLASS_DECL;
+				name_stack[at_level] = name_decl;
+
+				if (!generic) { // no generics, thanks
+					classes.push_back(class_decl);
+				} else if (OS::get_singleton()->is_stdout_verbose()) {
+					String full_name = class_decl.namespace_;
+					if (full_name.length())
+						full_name += ".";
+					full_name += class_decl.name;
+					OS::get_singleton()->print(String("Ignoring generic class declaration: " + class_decl.name).utf8());
+				}
+			}
+		} else if (tk == TK_IDENTIFIER && String(value) == "struct") {
+			String name;
+			int at_level = type_curly_stack;
+			while (true) {
+				tk = get_token();
+				if (tk == TK_IDENTIFIER && name.empty()) {
+					name = String(value);
+				} else if (tk == TK_CURLY_BRACKET_OPEN) {
+					if (name.empty()) {
+						error_str = "Expected identifier after keyword `struct`. Found `{`.";
+						error = true;
+						return ERR_PARSE_ERROR;
+					}
+
+					curly_stack++;
+					type_curly_stack++;
+					break;
+				} else if (tk == TK_EOF) {
+					error_str = "Expected `{` after struct decl. Found `EOF`.";
+					error = true;
+					return ERR_PARSE_ERROR;
+				}
+			}
+
+			NameDecl name_decl;
+			name_decl.name = name;
+			name_decl.type = NameDecl::STRUCT_DECL;
+			name_stack[at_level] = name_decl;
+		} else if (tk == TK_IDENTIFIER && String(value) == "namespace") {
+			if (type_curly_stack > 0) {
+				error_str = "Found namespace nested inside type.";
+				error = true;
+				return ERR_PARSE_ERROR;
+			}
+
+			String name;
+			int at_level = curly_stack;
+
+			Error err = _parse_namespace_name(name, curly_stack);
+			if (err)
+				return err;
+
+			NameDecl name_decl;
+			name_decl.name = name;
+			name_decl.type = NameDecl::NAMESPACE_DECL;
+			name_stack[at_level] = name_decl;
+		} else if (tk == TK_CURLY_BRACKET_OPEN) {
+			curly_stack++;
+		} else if (tk == TK_CURLY_BRACKET_CLOSE) {
+			curly_stack--;
+			if (name_stack.has(curly_stack)) {
+				if (name_stack[curly_stack].type != NameDecl::NAMESPACE_DECL)
+					type_curly_stack--;
+				name_stack.erase(curly_stack);
+			}
+		}
+
+		tk = get_token();
+	}
+
+	if (!error && tk == TK_EOF && curly_stack > 0) {
+		error_str = "Reached EOF with missing close curly brackets.";
+		error = true;
+	}
+
+	if (error)
+		return ERR_PARSE_ERROR;
+
+	return OK;
+}
+
+Error ScriptClassParser::parse_file(const String &p_filepath) {
+
+	String source;
+
+	Error ferr = read_all_file_utf8(p_filepath, source);
+	if (ferr != OK) {
+		if (ferr == ERR_INVALID_DATA) {
+			ERR_EXPLAIN("File '" + p_filepath + "' contains invalid unicode (utf-8), so it was not loaded. Please ensure that scripts are saved in valid utf-8 unicode.");
+		}
+		ERR_FAIL_V(ferr);
+	}
+
+	return parse(source);
+}
+
+String ScriptClassParser::get_error() {
+	return error_str;
+}
+
+Vector<ScriptClassParser::ClassDecl> ScriptClassParser::get_classes() {
+	return classes;
+}
diff --git a/modules/mono/editor/script_class_parser.h b/modules/mono/editor/script_class_parser.h
new file mode 100644
index 0000000000..11cf1853e2
--- /dev/null
+++ b/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