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authorJuan Linietsky <reduzio@gmail.com>2014-02-09 22:10:30 -0300
committerJuan Linietsky <reduzio@gmail.com>2014-02-09 22:10:30 -0300
commit0b806ee0fc9097fa7bda7ac0109191c9c5e0a1ac (patch)
tree276c4d099e178eb67fbd14f61d77b05e3808e9e3 /core/method_bind.h
parent0e49da1687bc8192ed210947da52c9e5c5f301bb (diff)
GODOT IS OPEN SOURCE
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+/*************************************************************************/
+/* method_bind.h */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* http://www.godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2014 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. */
+/*************************************************************************/
+#ifndef METHOD_BIND_H
+#define METHOD_BIND_H
+
+#include "list.h"
+#include "variant.h"
+#include "object.h"
+#include <stdio.h>
+
+/**
+ @author Juan Linietsky <reduzio@gmail.com>
+*/
+
+#ifdef DEBUG_ENABLED
+#define DEBUG_METHODS_ENABLED
+#endif
+
+enum MethodFlags {
+
+ METHOD_FLAG_NORMAL=1,
+ METHOD_FLAG_EDITOR=2,
+ METHOD_FLAG_NOSCRIPT=4,
+ METHOD_FLAG_CONST=8,
+ METHOD_FLAG_REVERSE=16, // used for events
+ METHOD_FLAG_VIRTUAL=32,
+ METHOD_FLAGS_DEFAULT=METHOD_FLAG_NORMAL,
+};
+
+template<class T>
+struct VariantCaster {
+
+ static _FORCE_INLINE_ T cast(const Variant& p_variant) {
+
+ return p_variant;
+ }
+};
+
+template<class T>
+struct VariantCaster<T&> {
+
+ static _FORCE_INLINE_ T cast(const Variant& p_variant) {
+
+ return p_variant;
+ }
+};
+
+template<class T>
+struct VariantCaster<const T&> {
+
+ static _FORCE_INLINE_ T cast(const Variant& p_variant) {
+
+ return p_variant;
+ }
+};
+
+#define _VC( m_idx )\
+ (VariantCaster<P##m_idx>::cast( (m_idx-1)>=p_arg_count?get_default_argument(m_idx-1):*p_args[m_idx-1] ))
+
+//SIMPLE_NUMERIC_TYPE is used to avoid a warning on Variant::get_type_for
+#define VARIANT_ENUM_CAST( m_enum ) \
+SIMPLE_NUMERIC_TYPE( m_enum );\
+template<> \
+struct VariantCaster<m_enum> {\
+\
+ static _FORCE_INLINE_ m_enum cast(const Variant& p_variant) {\
+ return (m_enum)p_variant.operator int();\
+ }\
+};
+
+
+#define CHECK_ARG(m_arg)\
+ if ((m_arg-1)<p_arg_count) {\
+ Variant::Type argtype=get_argument_type(m_arg-1);\
+ if (!Variant::can_convert(p_args[m_arg-1]->get_type(),argtype)) {\
+ r_error.error=Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;\
+ r_error.argument=m_arg-1;\
+ r_error.expected=argtype;\
+ return Variant();\
+ }\
+ }
+
+#define CHECK_NOARG(m_arg)\
+ {\
+ if (p_arg##m_arg.get_type()!=Variant::NIL) {\
+ if (r_argerror) *r_argerror=(m_arg-1);\
+ return CALL_ERROR_EXTRA_ARGUMENT;\
+ }\
+ }
+
+// some helpers
+
+VARIANT_ENUM_CAST( Vector3::Axis );
+VARIANT_ENUM_CAST( Image::Format );
+VARIANT_ENUM_CAST( Error );
+VARIANT_ENUM_CAST( wchar_t );
+VARIANT_ENUM_CAST( Margin );
+VARIANT_ENUM_CAST( Orientation );
+VARIANT_ENUM_CAST( HAlign );
+
+class MethodBind {
+
+
+ int method_id;
+ uint32_t hint_flags;
+ StringName name;
+ Vector<Variant> default_arguments;
+ int default_argument_count;
+ int argument_count;
+#ifdef DEBUG_METHODS_ENABLED
+ Vector<StringName> arg_names;
+ Variant::Type *argument_types;
+ StringName ret_type;
+#endif
+ bool _const;
+
+
+protected:
+
+ void _set_const(bool p_const);
+#ifdef DEBUG_METHODS_ENABLED
+ virtual Variant::Type _gen_argument_type(int p_arg) const=0;
+ void _generate_argument_types(int p_count);
+ void set_argument_types(Variant::Type *p_types) { argument_types=p_types; }
+#endif
+ void set_argument_count(int p_count) { argument_count=p_count; }
+public:
+
+ Vector<Variant> get_default_arguments() const { return default_arguments; }
+ _FORCE_INLINE_ int get_default_argument_count() const { return default_argument_count; }
+
+ _FORCE_INLINE_ Variant has_default_argument(int p_arg) const {
+
+ int idx=argument_count-p_arg-1;
+
+ if (idx<0 || idx>=default_arguments.size())
+ return false;
+ else
+ return true;
+ }
+
+ _FORCE_INLINE_ Variant get_default_argument(int p_arg) const {
+
+ int idx=argument_count-p_arg-1;
+
+ if (idx<0 || idx>=default_arguments.size())
+ return Variant();
+ else
+ return default_arguments[idx];
+ }
+
+#ifdef DEBUG_METHODS_ENABLED
+
+ _FORCE_INLINE_ void set_return_type(const StringName& p_type) { ret_type=p_type; }
+
+ _FORCE_INLINE_ Variant::Type get_argument_type(int p_argument) const {
+
+ ERR_FAIL_COND_V(p_argument<-1 || p_argument>argument_count,Variant::NIL);
+ return argument_types[p_argument+1];
+
+ }
+
+ PropertyInfo get_argument_info(int p_argument) const;
+
+ void set_argument_names(const Vector<StringName>& p_names);
+ Vector<StringName> get_argument_names() const;
+#endif
+ void set_hint_flags(uint32_t p_hint) { hint_flags=p_hint; }
+ uint32_t get_hint_flags() const { return hint_flags|(is_const()?METHOD_FLAG_CONST:0); }
+ virtual String get_instance_type() const=0;
+
+ _FORCE_INLINE_ int get_argument_count() const { return argument_count; };
+
+#if 0
+ _FORCE_INLINE_ Variant call_safe(const Variant** p_args,int p_arg_count, Variant::CallError& r_error) {
+
+ r_error.error=Variant::CallError::CALL_OK;
+ check_call( p_args, &errorarg );
+ if (!err)
+ return call(p_object, VARIANT_ARG_PASS );
+
+ VARIANT_ARGPTRS
+ String errstr;
+ String methodname = get_instance_type()+"::"+name;
+ if (err==CALL_ERROR_ARGUMENT_TYPE) {
+ errstr="Invalid Argument to call: '"+methodname+"'. Cannot convert argument "+itos(errorarg+1)+" from "+Variant::get_type_name(get_argument_type(errorarg))+" to "+Variant::get_type_name(argptr[errorarg]->get_type())+".";
+ }
+ if (err==CALL_ERROR_EXTRA_ARGUMENT) {
+ errstr="Invalid call. Member function '"+methodname+"' takes "+itos(get_argument_count())+" argument, but argument "+itos(errorarg+1)+" was received.";
+ }
+
+ ERR_PRINT(errstr.ascii().get_data());
+ return Variant();
+ }
+#endif
+ virtual Variant call(Object* p_object,const Variant** p_args,int p_arg_count, Variant::CallError& r_error)=0;
+ StringName get_name() const;
+ void set_name(const StringName& p_name);
+ _FORCE_INLINE_ int get_method_id() const { return method_id; }
+ _FORCE_INLINE_ bool is_const() const { return _const; }
+
+
+ void set_default_arguments(const Vector<Variant>& p_defargs);
+
+ MethodBind();
+ virtual ~MethodBind();
+};
+
+
+template<class T>
+class MethodBindNative : public MethodBind {
+public:
+ typedef Variant (T::*NativeCall)(const Variant**,int ,Variant::CallError &);
+protected:
+
+ NativeCall call_method;
+public:
+
+ virtual Variant::Type _gen_argument_type(int p_arg) const {
+
+ return Variant::NIL;
+ }
+
+ virtual Variant call(Object* p_object,const Variant** p_args,int p_arg_count, Variant::CallError& r_error) {
+
+ T* instance=static_cast<T*>(p_object);
+ return (instance->*call_method)(p_args,p_arg_count,r_error);
+ }
+ void set_method_info(const MethodInfo& p_info) {
+
+
+ set_argument_count( p_info.arguments.size() );
+#ifdef DEBUG_METHODS_ENABLED
+ Variant::Type *at = memnew_arr( Variant::Type , p_info.arguments.size()+1 );
+ at[0]=p_info.return_val.type;
+ if (p_info.arguments.size()) {
+
+ Vector<StringName> names;
+ names.resize(p_info.arguments.size());
+ for(int i=0;i<p_info.arguments.size();i++) {
+
+ at[i+1]=p_info.arguments[i].type;
+ names[i]=p_info.arguments[i].name;
+ }
+
+ set_argument_names(names);
+ }
+ set_argument_types(at);
+#endif
+ }
+
+ void set_method(NativeCall p_method) { call_method=p_method; }
+ virtual bool is_const() const { return false; }
+ virtual String get_instance_type() const { return T::get_type_static(); }
+
+ MethodBindNative() { call_method=NULL; }
+};
+
+
+template<class T >
+MethodBind* create_native_method_bind( Variant (T::*p_method)(const Variant**,int ,Variant::CallError &), const MethodInfo& p_info ) {
+
+ MethodBindNative<T > * a = memnew( (MethodBindNative<T >) );
+ a->set_method(p_method);
+ a->set_method_info(p_info);
+ return a;
+}
+
+
+/** This amazing hack is based on the FastDelegates theory */
+
+// tale of an amazing hack.. //
+
+// if you declare an unexisting class..
+class __UnexistingClass;
+
+
+#include "method_bind.inc"
+
+#endif