godot/modules/gdscript/gd_script.cpp

/*************************************************************************/
/*  gd_script.cpp                                                        */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "gd_script.h"
#include "globals.h"
#include "global_constants.h"
#include "gd_compiler.h"
#include "os/file_access.h"
#include "io/file_access_encrypted.h"
#include "os/os.h"

///////////////////////////

GDNativeClass::GDNativeClass(const StringName& p_name) {

	name=p_name;
}

/*void GDNativeClass::call_multilevel(const StringName& p_method,const Variant** p_args,int p_argcount){


}*/


bool GDNativeClass::_get(const StringName& p_name,Variant &r_ret) const {

	bool ok;
	int v = ObjectTypeDB::get_integer_constant(name, p_name, &ok);

	if (ok) {
		r_ret=v;
		return true;
	} else {
		return false;
	}
}


void GDNativeClass::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("new"),&GDNativeClass::_new);

}

Variant GDNativeClass::_new() {

	Object *o = instance();
	if (!o) {
		ERR_EXPLAIN("Class type: '"+String(name)+"' is not instantiable.");
		ERR_FAIL_COND_V(!o,Variant());
	}

	Reference *ref = o->cast_to<Reference>();
	if (ref) {
		return REF(ref);
	} else {
		return o;
	}

}

Object *GDNativeClass::instance() {

	return ObjectTypeDB::instance(name);
}



GDInstance* GDScript::_create_instance(const Variant** p_args,int p_argcount,Object *p_owner,bool p_isref,Variant::CallError& r_error) {


	/* STEP 1, CREATE */

	GDInstance* instance = memnew( GDInstance );
	instance->base_ref=p_isref;
	instance->members.resize(member_indices.size());
	instance->script=Ref<GDScript>(this);
	instance->owner=p_owner;
#ifdef DEBUG_ENABLED
	//needed for hot reloading
	for(Map<StringName,MemberInfo>::Element *E=member_indices.front();E;E=E->next()) {
		instance->member_indices_cache[E->key()]=E->get().index;
	}
#endif
	instance->owner->set_script_instance(instance);

	/* STEP 2, INITIALIZE AND CONSRTUCT */

	instances.insert(instance->owner);

	initializer->call(instance,p_args,p_argcount,r_error);

	if (r_error.error!=Variant::CallError::CALL_OK) {
		instance->script=Ref<GDScript>();
		instance->owner->set_script_instance(NULL);
		instances.erase(p_owner);
		ERR_FAIL_COND_V(r_error.error!=Variant::CallError::CALL_OK, NULL); //error constructing
	}

	//@TODO make thread safe
	return instance;

}

Variant GDScript::_new(const Variant** p_args,int p_argcount,Variant::CallError& r_error) {

	/* STEP 1, CREATE */

	if (!valid) {
		r_error.error=Variant::CallError::CALL_ERROR_INVALID_METHOD;
		return Variant();
	}

	r_error.error=Variant::CallError::CALL_OK;
	REF ref;
	Object *owner=NULL;

	GDScript *_baseptr=this;
	while (_baseptr->_base) {
		_baseptr=_baseptr->_base;
	}

	if (_baseptr->native.ptr()) {
		owner=_baseptr->native->instance();
	} else {
		owner=memnew( Reference ); //by default, no base means use reference
	}

	Reference *r=owner->cast_to<Reference>();
	if (r) {
		ref=REF(r);
	}


	GDInstance* instance = _create_instance(p_args,p_argcount,owner,r!=NULL,r_error);
	if (!instance) {
		if (ref.is_null()) {
			memdelete(owner); //no owner, sorry
		}
		return Variant();
	}

	if (ref.is_valid()) {
		return ref;
	} else {
		return owner;
	}
}

bool GDScript::can_instance() const {

	//return valid; //any script in GDscript can instance
	return valid || (!tool && !ScriptServer::is_scripting_enabled());

}

StringName GDScript::get_instance_base_type() const {

	if (native.is_valid())
		return native->get_name();
	if (base.is_valid())
		return base->get_instance_base_type();
	return StringName();
}

struct _GDScriptMemberSort {

	int index;
	StringName name;
	_FORCE_INLINE_ bool operator<(const _GDScriptMemberSort& p_member) const { return index < p_member.index; }

};


#ifdef TOOLS_ENABLED


void GDScript::_placeholder_erased(PlaceHolderScriptInstance *p_placeholder) {

	placeholders.erase(p_placeholder);
}

/*
void GDScript::_update_placeholder(PlaceHolderScriptInstance *p_placeholder) {


	List<PropertyInfo> plist;
	GDScript *scr=this;

	Map<StringName,Variant> default_values;
	while(scr) {

		Vector<_GDScriptMemberSort> msort;
		for(Map<StringName,PropertyInfo>::Element *E=scr->member_info.front();E;E=E->next()) {

			_GDScriptMemberSort ms;
			ERR_CONTINUE(!scr->member_indices.has(E->key()));
			ms.index=scr->member_indices[E->key()].index;
			ms.name=E->key();

			msort.push_back(ms);

		}

		msort.sort();
		msort.invert();
		for(int i=0;i<msort.size();i++) {

			plist.push_front(scr->member_info[msort[i].name]);
			if (scr->member_default_values.has(msort[i].name))
				default_values[msort[i].name]=scr->member_default_values[msort[i].name];
			else {
				Variant::CallError err;
				default_values[msort[i].name]=Variant::construct(scr->member_info[msort[i].name].type,NULL,0,err);
			}
		}

		scr=scr->_base;
	}


	p_placeholder->update(plist,default_values);

}*/
#endif

bool GDScript::get_property_default_value(const StringName& p_property, Variant &r_value) const {

#ifdef TOOLS_ENABLED

	//for (const Map<StringName,Variant>::Element *I=member_default_values.front();I;I=I->next()) {
	//	print_line("\t"+String(String(I->key())+":"+String(I->get())));
	//}
	const Map<StringName,Variant>::Element *E=member_default_values_cache.find(p_property);
	if (E) {
		r_value=E->get();
		return true;
	}

	if (base_cache.is_valid()) {
		return base_cache->get_property_default_value(p_property,r_value);
	}
#endif
	return false;

}

ScriptInstance* GDScript::instance_create(Object *p_this) {


	if (!tool && !ScriptServer::is_scripting_enabled()) {


#ifdef TOOLS_ENABLED

		//instance a fake script for editing the values
		//plist.invert();

		/*print_line("CREATING PLACEHOLDER");
		for(List<PropertyInfo>::Element *E=plist.front();E;E=E->next()) {
			print_line(E->get().name);
		}*/
		PlaceHolderScriptInstance *si = memnew( PlaceHolderScriptInstance(GDScriptLanguage::get_singleton(),Ref<Script>(this),p_this) );
		placeholders.insert(si);
		//_update_placeholder(si);
		_update_exports();
		return si;
#else
		return NULL;
#endif
	}

	GDScript *top=this;
	while(top->_base)
		top=top->_base;

	if (top->native.is_valid()) {
		if (!ObjectTypeDB::is_type(p_this->get_type_name(),top->native->get_name())) {

			if (ScriptDebugger::get_singleton()) {
				GDScriptLanguage::get_singleton()->debug_break_parse(get_path(),0,"Script inherits from native type '"+String(top->native->get_name())+"', so it can't be instanced in object of type: '"+p_this->get_type()+"'");
			}
			ERR_EXPLAIN("Script inherits from native type '"+String(top->native->get_name())+"', so it can't be instanced in object of type: '"+p_this->get_type()+"'");
			ERR_FAIL_V(NULL);

		}
	}

	Variant::CallError unchecked_error;
	return _create_instance(NULL,0,p_this,p_this->cast_to<Reference>(),unchecked_error);

}
bool GDScript::instance_has(const Object *p_this) const {

	return instances.has((Object*)p_this);
}

bool GDScript::has_source_code() const {

	return source!="";
}
String GDScript::get_source_code() const {

	return source;
}
void GDScript::set_source_code(const String& p_code) {

	if (source==p_code)
		return;
	source=p_code;
#ifdef TOOLS_ENABLED
	source_changed_cache=true;
	//print_line("SC CHANGED "+get_path());
#endif

}

#ifdef TOOLS_ENABLED
void GDScript::_update_exports_values(Map<StringName,Variant>& values, List<PropertyInfo> &propnames) {

	if (base_cache.is_valid()) {
		base_cache->_update_exports_values(values,propnames);
	}

	for(Map<StringName,Variant>::Element *E=member_default_values_cache.front();E;E=E->next()) {
		values[E->key()]=E->get();
	}

	for (List<PropertyInfo>::Element *E=members_cache.front();E;E=E->next()) {
		propnames.push_back(E->get());
	}

}
#endif

bool GDScript::_update_exports() {

#ifdef TOOLS_ENABLED

	bool changed=false;

	if (source_changed_cache) {
		//print_line("updating source for "+get_path());
		source_changed_cache=false;
		changed=true;

		String basedir=path;

		if (basedir=="")
			basedir=get_path();

		if (basedir!="")
			basedir=basedir.get_base_dir();

		GDParser parser;
		Error err = parser.parse(source,basedir,true,path);

		if (err==OK) {

			const GDParser::Node* root = parser.get_parse_tree();
			ERR_FAIL_COND_V(root->type!=GDParser::Node::TYPE_CLASS,false);

			const GDParser::ClassNode *c = static_cast<const GDParser::ClassNode*>(root);

			if (base_cache.is_valid()) {
				base_cache->inheriters_cache.erase(get_instance_ID());
				base_cache=Ref<GDScript>();
			}


			if (c->extends_used && String(c->extends_file)!="" && String(c->extends_file) != get_path()) {

				String path = c->extends_file;
				if (path.is_rel_path()) {

					String base = get_path();
					if (base=="" || base.is_rel_path()) {

						ERR_PRINT(("Could not resolve relative path for parent class: "+path).utf8().get_data());
					} else {
						path=base.get_base_dir().plus_file(path);
					}
				}

				if (path!=get_path()) {

					Ref<GDScript> bf = ResourceLoader::load(path);

					if (bf.is_valid()) {

						//print_line("parent is: "+bf->get_path());
						base_cache=bf;
						bf->inheriters_cache.insert(get_instance_ID());

						//bf->_update_exports(p_instances,true,false);

					}
				} else {
					ERR_PRINT(("Path extending itself in  "+path).utf8().get_data());
				}
			}

			members_cache.clear();;
			member_default_values_cache.clear();

			for(int i=0;i<c->variables.size();i++) {
				if (c->variables[i]._export.type==Variant::NIL)
					continue;

				members_cache.push_back(c->variables[i]._export);
				//print_line("found "+c->variables[i]._export.name);
				member_default_values_cache[c->variables[i].identifier]=c->variables[i].default_value;
			}

			_signals.clear();

			for(int i=0;i<c->_signals.size();i++) {
				_signals[c->_signals[i].name]=c->_signals[i].arguments;
			}
		}
	} else {
		//print_line("unchaged is "+get_path());

	}

	if (base_cache.is_valid()) {
		if (base_cache->_update_exports()) {
			changed = true;
		}
	}

	if (/*changed &&*/ placeholders.size()) { //hm :(

		//print_line("updating placeholders for "+get_path());

		//update placeholders if any
		Map<StringName,Variant> values;
		List<PropertyInfo> propnames;
		_update_exports_values(values,propnames);

		for (Set<PlaceHolderScriptInstance*>::Element *E=placeholders.front();E;E=E->next()) {

			E->get()->update(propnames,values);
		}
	}

	return changed;

#endif
	return false;
}

void GDScript::update_exports() {

#ifdef TOOLS_ENABLED

	_update_exports();

	Set<ObjectID> copy=inheriters_cache; //might get modified

	//print_line("update exports for "+get_path()+" ic: "+itos(copy.size()));
	for(Set<ObjectID>::Element *E=copy.front();E;E=E->next()) {
		Object *id=ObjectDB::get_instance(E->get());
		if (!id)
			continue;
		GDScript *s=id->cast_to<GDScript>();
		if (!s)
			continue;
		s->update_exports();
	}

#endif
}

void GDScript::_set_subclass_path(Ref<GDScript>& p_sc,const String& p_path) {

	p_sc->path=p_path;
	for(Map<StringName,Ref<GDScript> >::Element *E=p_sc->subclasses.front();E;E=E->next()) {

		_set_subclass_path(E->get(),p_path);
	}
}

Error GDScript::reload(bool p_keep_state) {


	ERR_FAIL_COND_V(!p_keep_state && instances.size(),ERR_ALREADY_IN_USE);

	String basedir=path;

	if (basedir=="")
		basedir=get_path();

	if (basedir!="")
		basedir=basedir.get_base_dir();




	valid=false;
	GDParser parser;
	Error err = parser.parse(source,basedir,false,path);
	if (err) {
		if (ScriptDebugger::get_singleton()) {
			GDScriptLanguage::get_singleton()->debug_break_parse(get_path(),parser.get_error_line(),"Parser Error: "+parser.get_error());
		}
		_err_print_error("GDScript::reload",path.empty()?"built-in":(const char*)path.utf8().get_data(),parser.get_error_line(),("Parse Error: "+parser.get_error()).utf8().get_data(),ERR_HANDLER_SCRIPT);
		ERR_FAIL_V(ERR_PARSE_ERROR);
	}


	bool can_run = ScriptServer::is_scripting_enabled() || parser.is_tool_script();

	GDCompiler compiler;
	err = compiler.compile(&parser,this,p_keep_state);

	if (err) {

		if (can_run) {
			if (ScriptDebugger::get_singleton()) {
				GDScriptLanguage::get_singleton()->debug_break_parse(get_path(),compiler.get_error_line(),"Parser Error: "+compiler.get_error());
			}
			_err_print_error("GDScript::reload",path.empty()?"built-in":(const char*)path.utf8().get_data(),compiler.get_error_line(),("Compile Error: "+compiler.get_error()).utf8().get_data(),ERR_HANDLER_SCRIPT);
			ERR_FAIL_V(ERR_COMPILATION_FAILED);
		} else {
			return err;
		}
	}

	valid=true;

	for(Map<StringName,Ref<GDScript> >::Element *E=subclasses.front();E;E=E->next()) {

		_set_subclass_path(E->get(),path);
	}

#ifdef TOOLS_ENABLED
	/*for (Set<PlaceHolderScriptInstance*>::Element *E=placeholders.front();E;E=E->next()) {

		_update_placeholder(E->get());
	}*/
#endif
	return OK;
}

String GDScript::get_node_type() const {

	return ""; // ?
}

ScriptLanguage *GDScript::get_language() const {

	return GDScriptLanguage::get_singleton();
}


Variant GDScript::call(const StringName& p_method,const Variant** p_args,int p_argcount,Variant::CallError &r_error) {


	GDScript *top=this;
	while(top) {

		Map<StringName,GDFunction*>::Element *E=top->member_functions.find(p_method);
		if (E) {

			if (!E->get()->is_static()) {
				WARN_PRINT(String("Can't call non-static function: '"+String(p_method)+"' in script.").utf8().get_data());
			}

			return E->get()->call(NULL,p_args,p_argcount,r_error);
		}
		top=top->_base;
	}

	//none found, regular

	return Script::call(p_method,p_args,p_argcount,r_error);

}

bool GDScript::_get(const StringName& p_name,Variant &r_ret) const {

	{


		const GDScript *top=this;
		while(top) {

			{
				const Map<StringName,Variant>::Element *E=top->constants.find(p_name);
				if (E) {

					r_ret= E->get();
					return true;
				}
			}

			{
				const Map<StringName,Ref<GDScript> >::Element *E=subclasses.find(p_name);
				if (E) {

					r_ret=E->get();
					return true;
				}
			}
			top=top->_base;
		}

		if (p_name==GDScriptLanguage::get_singleton()->strings._script_source) {

			r_ret=get_source_code();
			return true;
		}
	}



	return false;

}
bool GDScript::_set(const StringName& p_name, const Variant& p_value) {

	if (p_name==GDScriptLanguage::get_singleton()->strings._script_source) {

		set_source_code(p_value);
		reload();
	} else
		return false;

	return true;
}

void GDScript::_get_property_list(List<PropertyInfo> *p_properties) const {

	p_properties->push_back( PropertyInfo(Variant::STRING,"script/source",PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR) );
}


void GDScript::_bind_methods() {

	ObjectTypeDB::bind_native_method(METHOD_FLAGS_DEFAULT,"new",&GDScript::_new,MethodInfo("new"));

	ObjectTypeDB::bind_method(_MD("get_as_byte_code"),&GDScript::get_as_byte_code);

}


Vector<uint8_t> GDScript::get_as_byte_code() const {

	GDTokenizerBuffer tokenizer;
	return tokenizer.parse_code_string(source);
};


Error GDScript::load_byte_code(const String& p_path) {

	Vector<uint8_t> bytecode;

	if (p_path.ends_with("gde")) {

		FileAccess *fa = FileAccess::open(p_path,FileAccess::READ);
		ERR_FAIL_COND_V(!fa,ERR_CANT_OPEN);
		FileAccessEncrypted *fae = memnew( FileAccessEncrypted );
		ERR_FAIL_COND_V(!fae,ERR_CANT_OPEN);
		Vector<uint8_t> key;
		key.resize(32);
		for(int i=0;i<key.size();i++) {
			key[i]=script_encryption_key[i];
		}
		Error err = fae->open_and_parse(fa,key,FileAccessEncrypted::MODE_READ);
		ERR_FAIL_COND_V(err,err);
		bytecode.resize(fae->get_len());
		fae->get_buffer(bytecode.ptr(),bytecode.size());
		memdelete(fae);
	} else {

		bytecode = FileAccess::get_file_as_array(p_path);
	}
	ERR_FAIL_COND_V(bytecode.size()==0,ERR_PARSE_ERROR);
	path=p_path;

	String basedir=path;

	if (basedir=="")
		basedir=get_path();

	if (basedir!="")
		basedir=basedir.get_base_dir();

	valid=false;
	GDParser parser;
	Error err = parser.parse_bytecode(bytecode,basedir,get_path());
	if (err) {
		_err_print_error("GDScript::load_byte_code",path.empty()?"built-in":(const char*)path.utf8().get_data(),parser.get_error_line(),("Parse Error: "+parser.get_error()).utf8().get_data(),ERR_HANDLER_SCRIPT);
		ERR_FAIL_V(ERR_PARSE_ERROR);
	}

	GDCompiler compiler;
	err = compiler.compile(&parser,this);

	if (err) {
		_err_print_error("GDScript::load_byte_code",path.empty()?"built-in":(const char*)path.utf8().get_data(),compiler.get_error_line(),("Compile Error: "+compiler.get_error()).utf8().get_data(),ERR_HANDLER_SCRIPT);
		ERR_FAIL_V(ERR_COMPILATION_FAILED);
	}

	valid=true;

	for(Map<StringName,Ref<GDScript> >::Element *E=subclasses.front();E;E=E->next()) {

		_set_subclass_path(E->get(),path);
	}

	return OK;
}


Error GDScript::load_source_code(const String& p_path) {


	DVector<uint8_t> sourcef;
	Error err;
	FileAccess *f=FileAccess::open(p_path,FileAccess::READ,&err);
	if (err) {

		ERR_FAIL_COND_V(err,err);
	}

	int len = f->get_len();
	sourcef.resize(len+1);
	DVector<uint8_t>::Write w = sourcef.write();
	int r = f->get_buffer(w.ptr(),len);
	f->close();
	memdelete(f);
	ERR_FAIL_COND_V(r!=len,ERR_CANT_OPEN);
	w[len]=0;

	String s;
	if (s.parse_utf8((const char*)w.ptr())) {

		ERR_EXPLAIN("Script '"+p_path+"' contains invalid unicode (utf-8), so it was not loaded. Please ensure that scripts are saved in valid utf-8 unicode.");
		ERR_FAIL_V(ERR_INVALID_DATA);
	}

	source=s;
#ifdef TOOLS_ENABLED
	source_changed_cache=true;
#endif
	//print_line("LSC :"+get_path());
	path=p_path;
	return OK;

}


const Map<StringName,GDFunction*>& GDScript::debug_get_member_functions() const {

	return member_functions;
}



StringName GDScript::debug_get_member_by_index(int p_idx) const {


	for(const Map<StringName,MemberInfo>::Element *E=member_indices.front();E;E=E->next()) {

		if (E->get().index==p_idx)
			return E->key();
	}

	return "<error>";
}


Ref<GDScript> GDScript::get_base() const {

	return base;
}

bool GDScript::has_script_signal(const StringName& p_signal) const {
	if (_signals.has(p_signal))
		return true;
	if (base.is_valid()) {
		return base->has_script_signal(p_signal);
	}
#ifdef TOOLS_ENABLED
	else if (base_cache.is_valid()){
		return base_cache->has_script_signal(p_signal);
	}

#endif
	return false;
}
void GDScript::get_script_signal_list(List<MethodInfo> *r_signals) const {

	for(const Map<StringName,Vector<StringName> >::Element *E=_signals.front();E;E=E->next()) {

		MethodInfo mi;
		mi.name=E->key();
		for(int i=0;i<E->get().size();i++) {
			PropertyInfo arg;
			arg.name=E->get()[i];
			mi.arguments.push_back(arg);
		}
		r_signals->push_back(mi);
	}

	if (base.is_valid()) {
		base->get_script_signal_list(r_signals);
	}
#ifdef TOOLS_ENABLED
	else if (base_cache.is_valid()){
		base_cache->get_script_signal_list(r_signals);
	}

#endif

}


GDScript::GDScript() : script_list(this) {


	_static_ref=this;
	valid=false;
	subclass_count=0;
	initializer=NULL;
	_base=NULL;
	_owner=NULL;
	tool=false;
#ifdef TOOLS_ENABLED
	source_changed_cache=false;
#endif

#ifdef DEBUG_ENABLED
	if (GDScriptLanguage::get_singleton()->lock) {
		GDScriptLanguage::get_singleton()->lock->lock();
	}
	GDScriptLanguage::get_singleton()->script_list.add(&script_list);

	if (GDScriptLanguage::get_singleton()->lock) {
		GDScriptLanguage::get_singleton()->lock->unlock();
	}
#endif
}

GDScript::~GDScript() {
	for (Map<StringName,GDFunction*>::Element *E=member_functions.front();E;E=E->next()) {
		memdelete( E->get() );
	}

#ifdef DEBUG_ENABLED
	if (GDScriptLanguage::get_singleton()->lock) {
		GDScriptLanguage::get_singleton()->lock->lock();
	}
	GDScriptLanguage::get_singleton()->script_list.remove(&script_list);

	if (GDScriptLanguage::get_singleton()->lock) {
		GDScriptLanguage::get_singleton()->lock->unlock();
	}
#endif
}





//////////////////////////////
//         INSTANCE         //
//////////////////////////////


bool GDInstance::set(const StringName& p_name, const Variant& p_value) {

	//member
	{
		const Map<StringName,GDScript::MemberInfo>::Element *E = script->member_indices.find(p_name);
		if (E) {
			if (E->get().setter) {
				const Variant *val=&p_value;
				Variant::CallError err;
				call(E->get().setter,&val,1,err);
				if (err.error==Variant::CallError::CALL_OK) {
					return true; //function exists, call was successful
				}
			}
			else
				members[E->get().index] = p_value;
			return true;
		}
	}

	GDScript *sptr=script.ptr();
	while(sptr) {


		Map<StringName,GDFunction*>::Element *E = sptr->member_functions.find(GDScriptLanguage::get_singleton()->strings._set);
		if (E) {

			Variant name=p_name;
			const Variant *args[2]={&name,&p_value};

			Variant::CallError err;
			Variant ret = E->get()->call(this,(const Variant**)args,2,err);
			if (err.error==Variant::CallError::CALL_OK && ret.get_type()==Variant::BOOL && ret.operator bool())
				return true;
		}
		sptr = sptr->_base;
	}

	return false;
}

bool GDInstance::get(const StringName& p_name, Variant &r_ret) const {



	const GDScript *sptr=script.ptr();
	while(sptr) {

		{
			const Map<StringName,GDScript::MemberInfo>::Element *E = script->member_indices.find(p_name);
			if (E) {
				if (E->get().getter) {
					Variant::CallError err;
					r_ret=const_cast<GDInstance*>(this)->call(E->get().getter,NULL,0,err);
					if (err.error==Variant::CallError::CALL_OK) {
						return true;
					}
				}
				r_ret=members[E->get().index];
				return true; //index found

			}
		}

		{
			const Map<StringName,Variant>::Element *E = script->constants.find(p_name);
			if (E) {
				r_ret=E->get();
				return true; //index found

			}
		}

		{
			const Map<StringName,GDFunction*>::Element *E = sptr->member_functions.find(GDScriptLanguage::get_singleton()->strings._get);
			if (E) {

				Variant name=p_name;
				const Variant *args[1]={&name};

				Variant::CallError err;
				Variant ret = const_cast<GDFunction*>(E->get())->call(const_cast<GDInstance*>(this),(const Variant**)args,1,err);
				if (err.error==Variant::CallError::CALL_OK && ret.get_type()!=Variant::NIL) {
					r_ret=ret;
					return true;
				}
			}
		}
		sptr = sptr->_base;
	}

	return false;

}

Variant::Type GDInstance::get_property_type(const StringName& p_name,bool *r_is_valid) const {


	const GDScript *sptr=script.ptr();
	while(sptr) {

		if (sptr->member_info.has(p_name)) {
			if (r_is_valid)
				*r_is_valid=true;
			return sptr->member_info[p_name].type;
		}
		sptr = sptr->_base;
	}

	if (r_is_valid)
		*r_is_valid=false;
	return Variant::NIL;
}

void GDInstance::get_property_list(List<PropertyInfo> *p_properties) const {
	// exported members, not doen yet!

	const GDScript *sptr=script.ptr();
	List<PropertyInfo> props;

	while(sptr) {


		const Map<StringName,GDFunction*>::Element *E = sptr->member_functions.find(GDScriptLanguage::get_singleton()->strings._get_property_list);
		if (E) {


			Variant::CallError err;
			Variant ret = const_cast<GDFunction*>(E->get())->call(const_cast<GDInstance*>(this),NULL,0,err);
			if (err.error==Variant::CallError::CALL_OK) {

				if (ret.get_type()!=Variant::ARRAY) {

					ERR_EXPLAIN("Wrong type for _get_property list, must be an array of dictionaries.");
					ERR_FAIL();
				}
				Array arr = ret;
				for(int i=0;i<arr.size();i++) {

					Dictionary d = arr[i];
					ERR_CONTINUE(!d.has("name"));
					ERR_CONTINUE(!d.has("type"));
					PropertyInfo pinfo;
					pinfo.type = Variant::Type( d["type"].operator int());
					ERR_CONTINUE(pinfo.type<0 || pinfo.type>=Variant::VARIANT_MAX );
					pinfo.name = d["name"];
					ERR_CONTINUE(pinfo.name=="");
					if (d.has("hint"))
						pinfo.hint=PropertyHint(d["hint"].operator int());
					if (d.has("hint_string"))
						pinfo.hint_string=d["hint_string"];
					if (d.has("usage"))
						pinfo.usage=d["usage"];

					props.push_back(pinfo);

				}

			}
		}

		//instance a fake script for editing the values

		Vector<_GDScriptMemberSort> msort;
		for(Map<StringName,PropertyInfo>::Element *E=sptr->member_info.front();E;E=E->next()) {

			_GDScriptMemberSort ms;
			ERR_CONTINUE(!sptr->member_indices.has(E->key()));
			ms.index=sptr->member_indices[E->key()].index;
			ms.name=E->key();
			msort.push_back(ms);

		}

		msort.sort();
		msort.invert();
		for(int i=0;i<msort.size();i++) {

			props.push_front(sptr->member_info[msort[i].name]);

		}
#if 0
		if (sptr->member_functions.has("_get_property_list")) {

			Variant::CallError err;
			GDFunction *f = const_cast<GDFunction*>(sptr->member_functions["_get_property_list"]);
			Variant plv = f->call(const_cast<GDInstance*>(this),NULL,0,err);

			if (plv.get_type()!=Variant::ARRAY) {

				ERR_PRINT("_get_property_list: expected array returned");
			} else {

				Array pl=plv;

				for(int i=0;i<pl.size();i++) {

					Dictionary p = pl[i];
					PropertyInfo pinfo;
					if (!p.has("name")) {
						ERR_PRINT("_get_property_list: expected 'name' key of type string.")
								continue;
					}
					if (!p.has("type")) {
						ERR_PRINT("_get_property_list: expected 'type' key of type integer.")
								continue;
					}
					pinfo.name=p["name"];
					pinfo.type=Variant::Type(int(p["type"]));
					if (p.has("hint"))
						pinfo.hint=PropertyHint(int(p["hint"]));
					if (p.has("hint_string"))
						pinfo.hint_string=p["hint_string"];
					if (p.has("usage"))
						pinfo.usage=p["usage"];


					props.push_back(pinfo);
				}
			}
		}
#endif

		sptr = sptr->_base;
	}

	//props.invert();

	for (List<PropertyInfo>::Element *E=props.front();E;E=E->next()) {

		p_properties->push_back(E->get());
	}
}

void GDInstance::get_method_list(List<MethodInfo> *p_list) const {

	const GDScript *sptr=script.ptr();
	while(sptr) {

		for (Map<StringName,GDFunction*>::Element *E = sptr->member_functions.front();E;E=E->next()) {

			MethodInfo mi;
			mi.name=E->key();
			mi.flags|=METHOD_FLAG_FROM_SCRIPT;
			for(int i=0;i<E->get()->get_argument_count();i++)
				mi.arguments.push_back(PropertyInfo(Variant::NIL,"arg"+itos(i)));
			p_list->push_back(mi);
		}
		sptr = sptr->_base;
	}

}

bool GDInstance::has_method(const StringName& p_method) const {

	const GDScript *sptr=script.ptr();
	while(sptr) {
		const Map<StringName,GDFunction*>::Element *E = sptr->member_functions.find(p_method);
		if (E)
			return true;
		sptr = sptr->_base;
	}

	return false;
}
Variant GDInstance::call(const StringName& p_method,const Variant** p_args,int p_argcount,Variant::CallError &r_error) {

	//printf("calling %ls:%i method %ls\n", script->get_path().c_str(), -1, String(p_method).c_str());

	GDScript *sptr=script.ptr();
	while(sptr) {
		Map<StringName,GDFunction*>::Element *E = sptr->member_functions.find(p_method);
		if (E) {
			return E->get()->call(this,p_args,p_argcount,r_error);
		}
		sptr = sptr->_base;
	}
	r_error.error=Variant::CallError::CALL_ERROR_INVALID_METHOD;
	return Variant();
}

void GDInstance::call_multilevel(const StringName& p_method,const Variant** p_args,int p_argcount) {

	GDScript *sptr=script.ptr();
	Variant::CallError ce;

	while(sptr) {
		Map<StringName,GDFunction*>::Element *E = sptr->member_functions.find(p_method);
		if (E) {
			E->get()->call(this,p_args,p_argcount,ce);
		}
		sptr = sptr->_base;
	}

}


void GDInstance::_ml_call_reversed(GDScript *sptr,const StringName& p_method,const Variant** p_args,int p_argcount) {

	if (sptr->_base)
		_ml_call_reversed(sptr->_base,p_method,p_args,p_argcount);

	Variant::CallError ce;

	Map<StringName,GDFunction*>::Element *E = sptr->member_functions.find(p_method);
	if (E) {
		E->get()->call(this,p_args,p_argcount,ce);
	}

}

void GDInstance::call_multilevel_reversed(const StringName& p_method,const Variant** p_args,int p_argcount) {

	if (script.ptr()) {
		_ml_call_reversed(script.ptr(),p_method,p_args,p_argcount);
	}
}

void GDInstance::notification(int p_notification) {

	//notification is not virutal, it gets called at ALL levels just like in C.
	Variant value=p_notification;
	const Variant *args[1]={&value };

	GDScript *sptr=script.ptr();
	while(sptr) {
		Map<StringName,GDFunction*>::Element *E = sptr->member_functions.find(GDScriptLanguage::get_singleton()->strings._notification);
		if (E) {
			Variant::CallError err;
			E->get()->call(this,args,1,err);
			if (err.error!=Variant::CallError::CALL_OK) {
				//print error about notification call

			}
		}
		sptr = sptr->_base;
	}

}

Ref<Script> GDInstance::get_script() const {

	return script;
}

ScriptLanguage *GDInstance::get_language() {

	return GDScriptLanguage::get_singleton();
}

void GDInstance::reload_members() {

#ifdef DEBUG_ENABLED

	members.resize(script->member_indices.size()); //resize

	Vector<Variant> new_members;
	new_members.resize(script->member_indices.size());

	//pass the values to the new indices
	for(Map<StringName,GDScript::MemberInfo>::Element *E=script->member_indices.front();E;E=E->next()) {

		if (member_indices_cache.has(E->key())) {
			Variant value = members[member_indices_cache[E->key()]];
			new_members[E->get().index]=value;
		}

	}

	//apply
	members=new_members;

	//pass the values to the new indices
	member_indices_cache.clear();
	for(Map<StringName,GDScript::MemberInfo>::Element *E=script->member_indices.front();E;E=E->next()) {

		member_indices_cache[E->key()]=E->get().index;
	}

#endif
}

GDInstance::GDInstance() {
	owner=NULL;
	base_ref=false;
}

GDInstance::~GDInstance() {
	if (script.is_valid() && owner) {
		script->instances.erase(owner);
	}
}

/************* SCRIPT LANGUAGE **************/
/************* SCRIPT LANGUAGE **************/
/************* SCRIPT LANGUAGE **************/
/************* SCRIPT LANGUAGE **************/
/************* SCRIPT LANGUAGE **************/

GDScriptLanguage *GDScriptLanguage::singleton=NULL;


String GDScriptLanguage::get_name() const {

	return "GDScript";
}

/* LANGUAGE FUNCTIONS */

void GDScriptLanguage::_add_global(const StringName& p_name,const Variant& p_value) {


	if (globals.has(p_name)) {
		//overwrite existing
		global_array[globals[p_name]]=p_value;
		return;
	}
	globals[p_name]=global_array.size();
	global_array.push_back(p_value);
	_global_array=global_array.ptr();
}

void GDScriptLanguage::add_global_constant(const StringName& p_variable,const Variant& p_value) {

	_add_global(p_variable,p_value);
}


void GDScriptLanguage::init() {


	//populate global constants
	int gcc=GlobalConstants::get_global_constant_count();
	for(int i=0;i<gcc;i++) {

		_add_global(StaticCString::create(GlobalConstants::get_global_constant_name(i)),GlobalConstants::get_global_constant_value(i));
	}

	_add_global(StaticCString::create("PI"),Math_PI);

	//populate native classes

	List<StringName> class_list;
	ObjectTypeDB::get_type_list(&class_list);
	for(List<StringName>::Element *E=class_list.front();E;E=E->next()) {

		StringName n = E->get();
		String s = String(n);
		if (s.begins_with("_"))
			n=s.substr(1,s.length());

		if (globals.has(n))
			continue;
		Ref<GDNativeClass> nc = memnew( GDNativeClass(E->get()) );
		_add_global(n,nc);
	}

	//populate singletons

	List<Globals::Singleton> singletons;
	Globals::get_singleton()->get_singletons(&singletons);
	for(List<Globals::Singleton>::Element *E=singletons.front();E;E=E->next()) {

		_add_global(E->get().name,E->get().ptr);
	}
}

String GDScriptLanguage::get_type() const {

	return "GDScript";
}
String GDScriptLanguage::get_extension() const {

	return "gd";
}
Error GDScriptLanguage::execute_file(const String& p_path)  {

	// ??
	return OK;
}
void GDScriptLanguage::finish()  {


}

void GDScriptLanguage::profiling_start() {

#ifdef DEBUG_ENABLED
	if (lock) {
		lock->lock();
	}

	SelfList<GDFunction> *elem=function_list.first();
	while(elem) {
		elem->self()->profile.call_count=0;
		elem->self()->profile.self_time=0;
		elem->self()->profile.total_time=0;
		elem->self()->profile.frame_call_count=0;
		elem->self()->profile.frame_self_time=0;
		elem->self()->profile.frame_total_time=0;
		elem->self()->profile.last_frame_call_count=0;
		elem->self()->profile.last_frame_self_time=0;
		elem->self()->profile.last_frame_total_time=0;
		elem=elem->next();
	}

	profiling=true;
	if (lock) {
		lock->unlock();
	}

#endif

}

void GDScriptLanguage::profiling_stop() {

#ifdef DEBUG_ENABLED
	if (lock) {
		lock->lock();
	}

	profiling=false;
	if (lock) {
		lock->unlock();
	}

#endif
}

int GDScriptLanguage::profiling_get_accumulated_data(ProfilingInfo *p_info_arr,int p_info_max) {

	int current=0;
#ifdef DEBUG_ENABLED
	if (lock) {
		lock->lock();
	}


	SelfList<GDFunction> *elem=function_list.first();
	while(elem) {
		if (current>=p_info_max)
			break;
		p_info_arr[current].call_count=elem->self()->profile.call_count;
		p_info_arr[current].self_time=elem->self()->profile.self_time;
		p_info_arr[current].total_time=elem->self()->profile.total_time;
		p_info_arr[current].signature=elem->self()->profile.signature;
		elem=elem->next();
		current++;
	}



	if (lock) {
		lock->unlock();
	}


#endif

	return current;


}

int GDScriptLanguage::profiling_get_frame_data(ProfilingInfo *p_info_arr,int p_info_max) {

	int current=0;

#ifdef DEBUG_ENABLED
	if (lock) {
		lock->lock();
	}


	SelfList<GDFunction> *elem=function_list.first();
	while(elem) {
		if (current>=p_info_max)
			break;
		if (elem->self()->profile.last_frame_call_count>0) {
			p_info_arr[current].call_count=elem->self()->profile.last_frame_call_count;
			p_info_arr[current].self_time=elem->self()->profile.last_frame_self_time;
			p_info_arr[current].total_time=elem->self()->profile.last_frame_total_time;
			p_info_arr[current].signature=elem->self()->profile.signature;
			//print_line(String(elem->self()->profile.signature)+": "+itos(elem->self()->profile.last_frame_call_count));
			current++;
		}
		elem=elem->next();

	}


	if (lock) {
		lock->unlock();
	}


#endif

	return current;

}


struct GDScriptDepSort {

	//must support sorting so inheritance works properly (parent must be reloaded first)
	bool operator()(const Ref<GDScript> &A, const Ref<GDScript>& B) const {

		if (A==B)
			return false; //shouldn't happen but..
		const GDScript *I=B->get_base().ptr();
		while(I) {
			if (I==A.ptr()) {
				// A is a base of B
				return true;
			}

			I=I->get_base().ptr();
		}

		return false; //not a base
	}
};

void GDScriptLanguage::reload_all_scripts() {



#ifdef DEBUG_ENABLED
	print_line("RELOAD ALL SCRIPTS");
	if (lock) {
		lock->lock();
	}

	List<Ref<GDScript> > scripts;

	SelfList<GDScript> *elem=script_list.first();
	while(elem) {
		if (elem->self()->get_path().is_resource_file()) {
			print_line("FOUND: "+elem->self()->get_path());
			scripts.push_back(Ref<GDScript>(elem->self())); //cast to gdscript to avoid being erased by accident
		}
		elem=elem->next();
	}

	if (lock) {
		lock->unlock();
	}

	//as scripts are going to be reloaded, must proceed without locking here

	scripts.sort_custom<GDScriptDepSort>(); //update in inheritance dependency order

	for(List<Ref<GDScript> >::Element *E=scripts.front();E;E=E->next()) {

		print_line("RELOADING: "+E->get()->get_path());
		E->get()->load_source_code(E->get()->get_path());
		E->get()->reload(true);
	}
#endif
}

void GDScriptLanguage::frame() {

	//	print_line("calls: "+itos(calls));
	calls=0;

#ifdef DEBUG_ENABLED
	if (profiling) {
		if (lock) {
			lock->lock();
		}

		SelfList<GDFunction> *elem=function_list.first();
		while(elem) {
			elem->self()->profile.last_frame_call_count=elem->self()->profile.frame_call_count;
			elem->self()->profile.last_frame_self_time=elem->self()->profile.frame_self_time;
			elem->self()->profile.last_frame_total_time=elem->self()->profile.frame_total_time;
			elem->self()->profile.frame_call_count=0;
			elem->self()->profile.frame_self_time=0;
			elem->self()->profile.frame_total_time=0;
			elem=elem->next();
		}


		if (lock) {
			lock->unlock();
		}
	}

#endif
}

/* EDITOR FUNCTIONS */
void GDScriptLanguage::get_reserved_words(List<String> *p_words) const  {

	static const char *_reserved_words[]={
		// operators
		"and",
		"in",
		"not",
		"or",
		// types and values
		"false",
		"float",
		"int",
		"null",
		"PI",
		"self",
		"true",
		// functions
		"assert",
		"breakpoint",
		"class",
		"extends",
		"func",
		"preload",
		"setget",
		"signal",
		"tool",
		"yield",
		// var
		"const",
		"enum",
		"export",
		"onready",
		"static",
		"var",
		// control flow
		"break",
		"continue",
		"if",
		"elif",
		"else",
		"for",
		"pass",
		"return",
		"while",
		0};


	const char **w=_reserved_words;


	while (*w) {

		p_words->push_back(*w);
		w++;
	}

	for(int i=0;i<GDFunctions::FUNC_MAX;i++) {
		p_words->push_back(GDFunctions::get_func_name(GDFunctions::Function(i)));
	}

}

GDScriptLanguage::GDScriptLanguage() {

	calls=0;
	ERR_FAIL_COND(singleton);
	singleton=this;
	strings._init = StaticCString::create("_init");
	strings._notification = StaticCString::create("_notification");
	strings._set= StaticCString::create("_set");
	strings._get= StaticCString::create("_get");
	strings._get_property_list= StaticCString::create("_get_property_list");
	strings._script_source=StaticCString::create("script/source");
	_debug_parse_err_line=-1;
	_debug_parse_err_file="";

#ifdef NO_THREADS
	lock=NULL;
#else
	lock = Mutex::create();
#endif
	profiling=false;
	script_frame_time=0;

	_debug_call_stack_pos=0;
	int dmcs=GLOBAL_DEF("debug/script_max_call_stack",1024);
	if (ScriptDebugger::get_singleton()) {
		//debugging enabled!

		_debug_max_call_stack = dmcs;
		if (_debug_max_call_stack<1024)
			_debug_max_call_stack=1024;
		_call_stack = memnew_arr( CallLevel, _debug_max_call_stack+1 );

	} else {
		_debug_max_call_stack=0;
		_call_stack=NULL;
	}

}


GDScriptLanguage::~GDScriptLanguage() {


	if (lock) {
		memdelete(lock);
		lock=NULL;
	}
	if (_call_stack)  {
		memdelete_arr(_call_stack);
	}
	singleton=NULL;
}

/*************** RESOURCE ***************/

RES ResourceFormatLoaderGDScript::load(const String &p_path, const String& p_original_path, Error *r_error) {

	if (r_error)
		*r_error=ERR_FILE_CANT_OPEN;

	GDScript *script = memnew( GDScript );

	Ref<GDScript> scriptres(script);

	if (p_path.ends_with(".gde") || p_path.ends_with(".gdc")) {

		script->set_script_path(p_original_path); // script needs this.
		script->set_path(p_original_path);
		Error err = script->load_byte_code(p_path);


		if (err!=OK) {

			ERR_FAIL_COND_V(err!=OK, RES());
		}

	} else {
		Error err = script->load_source_code(p_path);

		if (err!=OK) {

			ERR_FAIL_COND_V(err!=OK, RES());
		}

		script->set_script_path(p_original_path); // script needs this.
		script->set_path(p_original_path);
		//script->set_name(p_path.get_file());

		script->reload();
	}
	if (r_error)
		*r_error=OK;

	return scriptres;
}
void ResourceFormatLoaderGDScript::get_recognized_extensions(List<String> *p_extensions) const {

	p_extensions->push_back("gd");
	p_extensions->push_back("gdc");
	p_extensions->push_back("gde");
}

bool ResourceFormatLoaderGDScript::handles_type(const String& p_type) const {

	return (p_type=="Script" || p_type=="GDScript");
}

String ResourceFormatLoaderGDScript::get_resource_type(const String &p_path) const {

	String el = p_path.extension().to_lower();
	if (el=="gd" || el=="gdc" || el=="gde")
		return "GDScript";
	return "";
}


Error ResourceFormatSaverGDScript::save(const String &p_path,const RES& p_resource,uint32_t p_flags) {

	Ref<GDScript> sqscr = p_resource;
	ERR_FAIL_COND_V(sqscr.is_null(),ERR_INVALID_PARAMETER);

	String source = sqscr->get_source_code();

	Error err;
	FileAccess *file = FileAccess::open(p_path,FileAccess::WRITE,&err);


	if (err) {

		ERR_FAIL_COND_V(err,err);
	}

	file->store_string(source);
	if (file->get_error()!=OK && file->get_error()!=ERR_FILE_EOF) {
		memdelete(file);
		return ERR_CANT_CREATE;
	}
	file->close();
	memdelete(file);
	return OK;
}

void ResourceFormatSaverGDScript::get_recognized_extensions(const RES& p_resource,List<String> *p_extensions) const {

	if (p_resource->cast_to<GDScript>()) {
		p_extensions->push_back("gd");
	}

}
bool ResourceFormatSaverGDScript::recognize(const RES& p_resource) const {

	return p_resource->cast_to<GDScript>()!=NULL;
}