godot-cpp/src/core/class_db.cpp

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/*************************************************************************/
/* class_db.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 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. */
/*************************************************************************/
#include <godot_cpp/core/class_db.hpp>
#include <godot_cpp/core/error_macros.hpp>
#include <godot_cpp/godot.hpp>
#include <godot_cpp/core/memory.hpp>
#include <algorithm>
namespace godot {
std::unordered_map<std::string, ClassDB::ClassInfo> ClassDB::classes;
GDNativeInitializationLevel ClassDB::current_level = GDNATIVE_INITIALIZATION_CORE;
MethodDefinition D_METHOD(const char *p_name) {
return MethodDefinition(p_name);
}
MethodDefinition D_METHOD(const char *p_name, const char *p_arg1) {
MethodDefinition method(p_name);
method.args.push_front(p_arg1);
return method;
}
void ClassDB::add_property(const char *p_class, const PropertyInfo &p_pinfo, const char *p_setter, const char *p_getter, int p_index) {
ERR_FAIL_COND_MSG(classes.find(p_class) == classes.end(), "Trying to add property to non-existing class.");
ClassInfo &info = classes[p_class];
ERR_FAIL_COND_MSG(info.property_setget.find(p_pinfo.name) != info.property_setget.end(), "Property already exists in class.");
MethodBind *setter = nullptr;
if (p_setter) {
setter = get_method(p_class, p_setter);
ERR_FAIL_COND_MSG(!setter, "Setter method not found for property.");
size_t exp_args = 1 + (p_index >= 0 ? 1 : 0);
ERR_FAIL_COND_MSG(exp_args != setter->get_argument_count(), "Setter method must take a single argument.");
}
ERR_FAIL_COND_MSG(!p_getter, "Getter method must be specified.");
MethodBind *getter = get_method(p_class, p_getter);
ERR_FAIL_COND_MSG(!getter, "Getter method not found for property.");
{
size_t exp_args = 0 + (p_index >= 0 ? 1 : 0);
ERR_FAIL_COND_MSG(exp_args != getter->get_argument_count(), "Getter method must not take any argument.");
}
info.property_list.push_back(p_pinfo);
PropertySetGet setget;
setget.setter = p_setter;
setget.getter = p_getter;
setget._setptr = setter;
setget._getptr = getter;
setget.index = p_index;
setget.type = p_pinfo.type;
info.property_setget[p_pinfo.name] = setget;
}
MethodBind *ClassDB::get_method(const char *p_class, const char *p_method) {
ERR_FAIL_COND_V_MSG(classes.find(p_class) == classes.end(), nullptr, "Class not found.");
ClassInfo *type = &classes[p_class];
while (type) {
std::unordered_map<std::string, MethodBind *>::iterator method = type->method_map.find(p_method);
if (method != type->method_map.end()) {
return method->second;
}
type = type->parent_ptr;
continue;
}
return nullptr;
}
MethodBind *ClassDB::bind_methodfi(uint32_t p_flags, MethodBind *p_bind, const MethodDefinition &method_name, const void **p_defs, int p_defcount) {
const char *instance_type = p_bind->get_instance_class();
std::unordered_map<std::string, ClassInfo>::iterator type_it = classes.find(instance_type);
if (type_it == classes.end()) {
memdelete(p_bind);
ERR_FAIL_V_MSG(nullptr, "Class doesn't exist.");
}
ClassInfo &type = type_it->second;
if (type.method_map.find(method_name.name) != type.method_map.end()) {
memdelete(p_bind);
ERR_FAIL_V_MSG(nullptr, "Binding duplicate method.");
}
if (type.virtual_methods.find(method_name.name) != type.virtual_methods.end()) {
memdelete(p_bind);
ERR_FAIL_V_MSG(nullptr, "Method already bound as virtual.");
}
p_bind->set_name(method_name.name);
if (method_name.args.size() > p_bind->get_argument_count()) {
memdelete(p_bind);
ERR_FAIL_V_MSG(nullptr, "Method definition has more arguments than the actual method.");
}
p_bind->set_hint_flags(p_flags);
std::vector<std::string> args;
args.resize(method_name.args.size());
size_t arg_index = 0;
for (std::string arg : method_name.args) {
args[arg_index++] = arg;
}
p_bind->set_argument_names(args);
type.method_order.push_back(p_bind);
type.method_map[method_name.name] = p_bind;
return p_bind;
}
void ClassDB::add_signal(const char *p_class, const MethodInfo &p_signal) {
std::unordered_map<std::string, ClassInfo>::iterator type_it = classes.find(p_class);
ERR_FAIL_COND_MSG(type_it == classes.end(), "Class doesn't exist.");
ClassInfo &base = type_it->second;
ClassInfo *check = &base;
while (check) {
ERR_FAIL_COND_MSG(check->signal_map.find(p_signal.name) != check->signal_map.end(), String("Class '" + String(p_class) + "' already has signal '" + String(p_signal.name) + "'.").utf8().get_data());
check = check->parent_ptr;
}
base.signal_map[p_signal.name] = p_signal;
}
void ClassDB::bind_integer_constant(const char *p_class, const char *p_enum, const char *p_name, GDNativeInt p_constant) {
std::unordered_map<std::string, ClassInfo>::iterator type_it = classes.find(p_class);
ERR_FAIL_COND_MSG(type_it == classes.end(), "Class doesn't exist.");
ClassInfo &type = type_it->second;
ERR_FAIL_COND_MSG(type.constant_map.find(p_name) != type.constant_map.end(), "Constant already registered.");
type.constant_map[p_name] = std::pair<std::string, GDNativeInt>{ p_enum, p_constant };
type.constant_order.push_back(p_name);
}
GDNativeExtensionClassCallVirtual ClassDB::get_virtual_func(void *p_userdata, const char *p_name) {
const char *class_name = (const char *)p_userdata;
std::unordered_map<std::string, ClassInfo>::iterator type_it = classes.find(class_name);
ERR_FAIL_COND_V_MSG(type_it == classes.end(), nullptr, "Class doesn't exist.");
ClassInfo &type = type_it->second;
std::unordered_map<std::string, GDNativeExtensionClassCallVirtual>::iterator method_it = type.virtual_methods.find(p_name);
if (method_it == type.virtual_methods.end()) {
return nullptr;
}
return method_it->second;
}
void ClassDB::bind_virtual_method(const char *p_class, const char *p_method, GDNativeExtensionClassCallVirtual p_call) {
std::unordered_map<std::string, ClassInfo>::iterator type_it = classes.find(p_class);
ERR_FAIL_COND_MSG(type_it == classes.end(), "Class doesn't exist.");
ClassInfo &type = type_it->second;
ERR_FAIL_COND_MSG(type.method_map.find(p_method) != type.method_map.end(), "Method already registered as non-virtual.");
ERR_FAIL_COND_MSG(type.virtual_methods.find(p_method) != type.virtual_methods.end(), "Virtual method already registered.");
type.virtual_methods[p_method] = p_call;
}
void ClassDB::initialize(GDNativeInitializationLevel p_level) {
for (const std::pair<std::string, ClassInfo> pair : classes) {
const ClassInfo &cl = pair.second;
if (cl.level != p_level) {
continue;
}
GDNativeExtensionClassCreationInfo class_info = {
nullptr, // GDNativeExtensionClassSet set_func;
nullptr, // GDNativeExtensionClassGet get_func;
nullptr, // GDNativeExtensionClassGetPropertyList get_property_list_func;
nullptr, // GDNativeExtensionClassFreePropertyList free_property_list_func;
nullptr, // GDNativeExtensionClassNotification notification_func;
nullptr, // GDNativeExtensionClassToString to_string_func;
nullptr, // GDNativeExtensionClassReference reference_func;
nullptr, // GDNativeExtensionClassUnreference
cl.constructor, // GDNativeExtensionClassCreateInstance create_instance_func; /* this one is mandatory */
cl.destructor, // GDNativeExtensionClassFreeInstance free_instance_func; /* this one is mandatory */
cl.object_instance, // GDNativeExtensionClassObjectInstance object_instance_func; /* this one is mandatory */
&ClassDB::get_virtual_func, // GDNativeExtensionClassGetVirtual get_virtual_func;
(void *)cl.name, //void *class_userdata;
};
internal::interface->classdb_register_extension_class(internal::library, cl.name, cl.parent_name, &class_info);
for (MethodBind *method : cl.method_order) {
GDNativeExtensionClassMethodInfo method_info = {
method->get_name(), //const char *name;
method, //void *method_userdata;
MethodBind::bind_call, //GDNativeExtensionClassMethodCall call_func;
MethodBind::bind_ptrcall, //GDNativeExtensionClassMethodPtrCall ptrcall_func;
GDNATIVE_EXTENSION_METHOD_FLAGS_DEFAULT, //uint32_t method_flags; /* GDNativeExtensionClassMethodFlags */
(uint32_t)method->get_argument_count(), //uint32_t argument_count;
(GDNativeBool)method->has_return(), //GDNativeBool has_return_value;
MethodBind::bind_get_argument_type, //(GDNativeExtensionClassMethodGetArgumentType) get_argument_type_func;
MethodBind::bind_get_argument_info, //GDNativeExtensionClassMethodGetArgumentInfo get_argument_info_func; /* name and hint information for the argument can be omitted in release builds. Class name should always be present if it applies. */
MethodBind::bind_get_argument_metadata, //GDNativeExtensionClassMethodGetArgumentMetadata get_argument_metadata_func;
method->get_hint_flags(), //uint32_t default_argument_count;
nullptr, //GDNativeVariantPtr *default_arguments;
};
internal::interface->classdb_register_extension_class_method(internal::library, cl.name, &method_info);
}
for (const PropertyInfo &property : cl.property_list) {
GDNativePropertyInfo info = {
(uint32_t)property.type, //uint32_t type;
property.name, //const char *name;
property.class_name, //const char *class_name;
property.hint, // NONE //uint32_t hint;
property.hint_string, // const char *hint_string;
property.usage, // DEFAULT //uint32_t usage;
};
const PropertySetGet &setget = cl.property_setget.find(property.name)->second;
internal::interface->classdb_register_extension_class_property(internal::library, cl.name, &info, setget.setter, setget.getter);
}
for (const std::pair<std::string, MethodInfo> pair : cl.signal_map) {
const MethodInfo &signal = pair.second;
std::vector<GDNativePropertyInfo> parameters;
parameters.reserve(signal.arguments.size());
for (const PropertyInfo &par : signal.arguments) {
parameters.push_back(GDNativePropertyInfo{
static_cast<uint32_t>(par.type), // uint32_t type;
par.name, // const char *name;
par.class_name, // const char *class_name;
par.hint, // uint32_t hint;
par.hint_string, // const char *hint_string;
par.usage, // uint32_t usage;
});
}
internal::interface->classdb_register_extension_class_signal(internal::library, cl.name, pair.first.c_str(), parameters.data(), parameters.size());
}
for (std::string constant : cl.constant_order) {
const std::pair<std::string, GDNativeInt> &def = cl.constant_map.find(constant)->second;
internal::interface->classdb_register_extension_class_integer_constant(internal::library, cl.name, def.first.c_str(), constant.c_str(), def.second);
}
}
}
void ClassDB::deinitialize(GDNativeInitializationLevel p_level) {
for (const std::pair<std::string, ClassInfo> pair : classes) {
const ClassInfo &cl = pair.second;
if (cl.level != p_level) {
continue;
}
internal::interface->classdb_unregister_extension_class(internal::library, cl.name);
for (MethodBind *method : cl.method_order) {
memdelete(method);
}
}
}
} // namespace godot