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godot/core/method_bind.h

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/*************************************************************************/
/* method_bind.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* 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 "method_ptrcall.h"
#include "object.h"
#include "variant.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_FLAG_FROM_SCRIPT = 64,
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
#ifdef PTRCALL_ENABLED
#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(); \
} \
}; \
template <> \
struct PtrToArg<m_enum> { \
_FORCE_INLINE_ static m_enum convert(const void *p_ptr) { \
return m_enum(*reinterpret_cast<const int *>(p_ptr)); \
} \
_FORCE_INLINE_ static void encode(m_enum p_val, const void *p_ptr) { \
*(int *)p_ptr = p_val; \
} \
};
#else
#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(); \
} \
};
#endif
#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_strict(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_ StringName get_return_type() const { return ret_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;
#ifdef PTRCALL_ENABLED
virtual void ptrcall(Object *p_object, const void **p_args, void *r_ret) = 0;
#endif
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
}
#ifdef PTRCALL_ENABLED
virtual void ptrcall(Object *p_object, const void **p_args, void *r_ret) {} //todo
#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 nonexistent class..
class __UnexistingClass;
#include "method_bind.gen.inc"
#endif
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