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pandemonium_engine/modules/gdnative/nativescript/api_generator.cpp

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/*************************************************************************/
/* api_generator.cpp */
/*************************************************************************/
/* This file is part of: */
/* PANDEMONIUM ENGINE */
/* https://github.com/Relintai/pandemonium_engine */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* Copyright (c) 2007-2022 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 "api_generator.h"
#ifdef TOOLS_ENABLED
#include "core/config/engine.h"
#include "core/containers/pair.h"
#include "core/containers/rb_set.h"
#include "core/global_constants.h"
#include "core/object/class_db.h"
#include "core/os/file_access.h"
// helper stuff
static Error save_file(const String &p_path, const List<String> &p_content) {
FileAccessRef file = FileAccess::open(p_path, FileAccess::WRITE);
ERR_FAIL_COND_V(!file, ERR_FILE_CANT_WRITE);
for (const List<String>::Element *e = p_content.front(); e != nullptr; e = e->next()) {
file->store_string(e->get());
}
file->close();
return OK;
}
// helper stuff end
struct MethodAPI {
String method_name;
String return_type;
List<String> argument_types;
List<String> argument_names;
RBMap<int, Variant> default_arguments;
int argument_count;
bool has_varargs;
bool is_editor;
bool is_noscript;
bool is_const;
bool is_reverse;
bool is_virtual;
bool is_from_script;
};
struct PropertyAPI {
String name;
String getter;
String setter;
String type;
int index;
};
struct ConstantAPI {
String constant_name;
int constant_value;
};
struct SignalAPI {
String name;
List<String> argument_types;
List<String> argument_names;
RBMap<int, Variant> default_arguments;
};
struct EnumAPI {
String name;
List<Pair<int, String>> values;
};
struct ClassAPI {
String class_name;
String super_class_name;
ClassDB::APIType api_type;
bool is_singleton;
String singleton_name;
bool is_instanciable;
// @Unclear
bool is_reference;
List<MethodAPI> methods;
List<PropertyAPI> properties;
List<ConstantAPI> constants;
List<SignalAPI> signals_;
List<EnumAPI> enums;
};
static String get_type_name(const PropertyInfo &info) {
if (info.type == Variant::INT && (info.usage & PROPERTY_USAGE_CLASS_IS_ENUM)) {
return String("enum.") + String(info.class_name).replace(".", "::");
}
if (info.class_name != StringName()) {
return info.class_name;
}
if (info.hint == PROPERTY_HINT_RESOURCE_TYPE) {
return info.hint_string;
}
if (info.type == Variant::NIL && (info.usage & PROPERTY_USAGE_NIL_IS_VARIANT)) {
return "Variant";
}
if (info.type == Variant::NIL) {
return "void";
}
return Variant::get_type_name(info.type);
}
/*
* Some comparison helper functions we need
*/
struct MethodInfoComparator {
StringName::AlphCompare compare;
bool operator()(const MethodInfo &p_a, const MethodInfo &p_b) const {
return compare(p_a.name, p_b.name);
}
};
struct PropertyInfoComparator {
StringName::AlphCompare compare;
bool operator()(const PropertyInfo &p_a, const PropertyInfo &p_b) const {
return compare(p_a.name, p_b.name);
}
};
struct ConstantAPIComparator {
NoCaseComparator compare;
bool operator()(const ConstantAPI &p_a, const ConstantAPI &p_b) const {
return compare(p_a.constant_name, p_b.constant_name);
}
};
/*
* Reads the entire Pandemonium API to a list
*/
List<ClassAPI> generate_c_api_classes() {
List<ClassAPI> api;
List<StringName> classes;
ClassDB::get_class_list(&classes);
classes.sort_custom<StringName::AlphCompare>();
// Register global constants as a fake GlobalConstants singleton class
{
ClassAPI global_constants_api;
global_constants_api.class_name = L"GlobalConstants";
global_constants_api.api_type = ClassDB::API_CORE;
global_constants_api.is_singleton = true;
global_constants_api.singleton_name = L"GlobalConstants";
global_constants_api.is_instanciable = false;
const int constants_count = GlobalConstants::get_global_constant_count();
for (int i = 0; i < constants_count; ++i) {
ConstantAPI constant_api;
constant_api.constant_name = GlobalConstants::get_global_constant_name(i);
constant_api.constant_value = GlobalConstants::get_global_constant_value(i);
global_constants_api.constants.push_back(constant_api);
}
global_constants_api.constants.sort_custom<ConstantAPIComparator>();
api.push_back(global_constants_api);
}
for (List<StringName>::Element *e = classes.front(); e != nullptr; e = e->next()) {
StringName class_name = e->get();
ClassAPI class_api;
class_api.api_type = ClassDB::get_api_type(e->get());
class_api.class_name = class_name;
class_api.super_class_name = ClassDB::get_parent_class(class_name);
{
String name = class_name;
if (name.begins_with("_")) {
name.remove(0);
}
class_api.is_singleton = Engine::get_singleton()->has_singleton(name);
if (class_api.is_singleton) {
class_api.singleton_name = name;
}
}
class_api.is_instanciable = !class_api.is_singleton && ClassDB::can_instance(class_name);
{
List<StringName> inheriters;
ClassDB::get_inheriters_from_class("Reference", &inheriters);
bool is_reference = !!inheriters.find(class_name) || class_name == "Reference";
// @Unclear
class_api.is_reference = !class_api.is_singleton && is_reference;
}
// constants
{
List<String> constant;
ClassDB::get_integer_constant_list(class_name, &constant, true);
constant.sort_custom<NoCaseComparator>();
for (List<String>::Element *c = constant.front(); c != nullptr; c = c->next()) {
ConstantAPI constant_api;
constant_api.constant_name = c->get();
constant_api.constant_value = ClassDB::get_integer_constant(class_name, c->get());
class_api.constants.push_back(constant_api);
}
}
// signals
{
List<MethodInfo> signals_;
ClassDB::get_signal_list(class_name, &signals_, true);
signals_.sort_custom<MethodInfoComparator>();
for (int i = 0; i < signals_.size(); i++) {
SignalAPI signal;
MethodInfo method_info = signals_[i];
signal.name = method_info.name;
for (int j = 0; j < method_info.arguments.size(); j++) {
PropertyInfo argument = method_info.arguments[j];
String type;
String name = argument.name;
if (argument.name.find(":") != -1) {
type = argument.name.get_slice(":", 1);
name = argument.name.get_slice(":", 0);
} else {
type = get_type_name(argument);
}
signal.argument_names.push_back(name);
signal.argument_types.push_back(type);
}
Vector<Variant> default_arguments = method_info.default_arguments;
int default_start = signal.argument_names.size() - default_arguments.size();
for (int j = 0; j < default_arguments.size(); j++) {
signal.default_arguments[default_start + j] = default_arguments[j];
}
class_api.signals_.push_back(signal);
}
}
//properties
{
List<PropertyInfo> properties;
ClassDB::get_property_list(class_name, &properties, true);
properties.sort_custom<PropertyInfoComparator>();
for (List<PropertyInfo>::Element *p = properties.front(); p != nullptr; p = p->next()) {
PropertyAPI property_api;
property_api.name = p->get().name;
property_api.getter = ClassDB::get_property_getter(class_name, p->get().name);
property_api.setter = ClassDB::get_property_setter(class_name, p->get().name);
if (p->get().name.find(":") != -1) {
property_api.type = p->get().name.get_slice(":", 1);
property_api.name = p->get().name.get_slice(":", 0);
} else {
property_api.type = get_type_name(p->get());
}
property_api.index = ClassDB::get_property_index(class_name, p->get().name);
if (!property_api.setter.empty() || !property_api.getter.empty()) {
class_api.properties.push_back(property_api);
}
}
}
//methods
{
List<MethodInfo> methods;
ClassDB::get_method_list(class_name, &methods, true);
methods.sort_custom<MethodInfoComparator>();
RBSet<String> virtual_method_set;
for (List<MethodInfo>::Element *m = methods.front(); m != nullptr; m = m->next()) {
MethodAPI method_api;
MethodBind *method_bind = ClassDB::get_method(class_name, m->get().name);
MethodInfo &method_info = m->get();
//method name
method_api.method_name = method_info.name;
//method return type
if (method_api.method_name.find(":") != -1) {
method_api.return_type = method_api.method_name.get_slice(":", 1);
method_api.method_name = method_api.method_name.get_slice(":", 0);
} else {
method_api.return_type = get_type_name(m->get().return_val);
}
method_api.argument_count = method_info.arguments.size();
method_api.has_varargs = method_bind && method_bind->is_vararg();
// Method flags
method_api.is_virtual = false;
if (method_info.flags) {
const uint32_t flags = method_info.flags;
method_api.is_editor = flags & METHOD_FLAG_EDITOR;
method_api.is_noscript = flags & METHOD_FLAG_NOSCRIPT;
method_api.is_const = flags & METHOD_FLAG_CONST;
method_api.is_reverse = flags & METHOD_FLAG_REVERSE;
method_api.is_virtual = flags & METHOD_FLAG_VIRTUAL;
method_api.is_from_script = flags & METHOD_FLAG_FROM_SCRIPT;
}
method_api.is_virtual = method_api.is_virtual || method_api.method_name[0] == '_';
if (method_api.is_virtual) {
if (virtual_method_set.has(method_api.method_name)) {
continue;
}
virtual_method_set.insert(method_api.method_name);
}
// method argument name and type
for (int i = 0; i < method_api.argument_count; i++) {
String arg_name;
String arg_type;
PropertyInfo arg_info = method_info.arguments[i];
arg_name = arg_info.name;
if (arg_info.name.find(":") != -1) {
arg_type = arg_info.name.get_slice(":", 1);
arg_name = arg_info.name.get_slice(":", 0);
} else if (arg_info.hint == PROPERTY_HINT_RESOURCE_TYPE) {
arg_type = arg_info.hint_string;
} else if (arg_info.type == Variant::NIL) {
arg_type = "Variant";
} else if (arg_info.type == Variant::OBJECT) {
arg_type = arg_info.class_name;
if (arg_type == "") {
arg_type = Variant::get_type_name(arg_info.type);
}
} else {
arg_type = Variant::get_type_name(arg_info.type);
}
method_api.argument_names.push_back(arg_name);
method_api.argument_types.push_back(arg_type);
if (method_bind && method_bind->has_default_argument(i)) {
method_api.default_arguments[i] = method_bind->get_default_argument(i);
}
}
class_api.methods.push_back(method_api);
}
}
// enums
{
List<EnumAPI> enums;
List<StringName> enum_names;
ClassDB::get_enum_list(class_name, &enum_names, true);
for (List<StringName>::Element *E = enum_names.front(); E; E = E->next()) {
List<StringName> value_names;
EnumAPI enum_api;
enum_api.name = E->get();
ClassDB::get_enum_constants(class_name, E->get(), &value_names, true);
for (List<StringName>::Element *val_e = value_names.front(); val_e; val_e = val_e->next()) {
int int_val = ClassDB::get_integer_constant(class_name, val_e->get(), nullptr);
enum_api.values.push_back(Pair<int, String>(int_val, val_e->get()));
}
enum_api.values.sort_custom<PairSort<int, String>>();
class_api.enums.push_back(enum_api);
}
}
api.push_back(class_api);
}
return api;
}
/*
* Generates the JSON source from the API in p_api
*/
static List<String> generate_c_api_json(const List<ClassAPI> &p_api) {
// I'm sorry for the \t mess
List<String> source;
source.push_back("[\n");
for (const List<ClassAPI>::Element *c = p_api.front(); c != nullptr; c = c->next()) {
ClassAPI api = c->get();
source.push_back("\t{\n");
source.push_back("\t\t\"name\": \"" + api.class_name + "\",\n");
source.push_back("\t\t\"base_class\": \"" + api.super_class_name + "\",\n");
source.push_back(String("\t\t\"api_type\": \"") + (api.api_type == ClassDB::API_CORE ? "core" : (api.api_type == ClassDB::API_EDITOR ? "tools" : "none")) + "\",\n");
source.push_back(String("\t\t\"singleton\": ") + (api.is_singleton ? "true" : "false") + ",\n");
source.push_back("\t\t\"singleton_name\": \"" + api.singleton_name + "\",\n");
source.push_back(String("\t\t\"instanciable\": ") + (api.is_instanciable ? "true" : "false") + ",\n");
source.push_back(String("\t\t\"is_reference\": ") + (api.is_reference ? "true" : "false") + ",\n");
// @Unclear
source.push_back("\t\t\"constants\": {\n");
for (List<ConstantAPI>::Element *e = api.constants.front(); e; e = e->next()) {
source.push_back("\t\t\t\"" + e->get().constant_name + "\": " + String::num_int64(e->get().constant_value) + (e->next() ? "," : "") + "\n");
}
source.push_back("\t\t},\n");
source.push_back("\t\t\"properties\": [\n");
for (List<PropertyAPI>::Element *e = api.properties.front(); e; e = e->next()) {
source.push_back("\t\t\t{\n");
source.push_back("\t\t\t\t\"name\": \"" + e->get().name + "\",\n");
source.push_back("\t\t\t\t\"type\": \"" + e->get().type + "\",\n");
source.push_back("\t\t\t\t\"getter\": \"" + e->get().getter + "\",\n");
source.push_back("\t\t\t\t\"setter\": \"" + e->get().setter + "\",\n");
source.push_back(String("\t\t\t\t\"index\": ") + itos(e->get().index) + "\n");
source.push_back(String("\t\t\t}") + (e->next() ? "," : "") + "\n");
}
source.push_back("\t\t],\n");
source.push_back("\t\t\"signals\": [\n");
for (List<SignalAPI>::Element *e = api.signals_.front(); e; e = e->next()) {
source.push_back("\t\t\t{\n");
source.push_back("\t\t\t\t\"name\": \"" + e->get().name + "\",\n");
source.push_back("\t\t\t\t\"arguments\": [\n");
for (int i = 0; i < e->get().argument_names.size(); i++) {
source.push_back("\t\t\t\t\t{\n");
source.push_back("\t\t\t\t\t\t\"name\": \"" + e->get().argument_names[i] + "\",\n");
source.push_back("\t\t\t\t\t\t\"type\": \"" + e->get().argument_types[i] + "\",\n");
source.push_back(String("\t\t\t\t\t\t\"has_default_value\": ") + (e->get().default_arguments.has(i) ? "true" : "false") + ",\n");
source.push_back("\t\t\t\t\t\t\"default_value\": \"" + (e->get().default_arguments.has(i) ? (String)e->get().default_arguments[i] : "") + "\"\n");
source.push_back(String("\t\t\t\t\t}") + ((i < e->get().argument_names.size() - 1) ? "," : "") + "\n");
}
source.push_back("\t\t\t\t]\n");
source.push_back(String("\t\t\t}") + (e->next() ? "," : "") + "\n");
}
source.push_back("\t\t],\n");
source.push_back("\t\t\"methods\": [\n");
for (List<MethodAPI>::Element *e = api.methods.front(); e; e = e->next()) {
source.push_back("\t\t\t{\n");
source.push_back("\t\t\t\t\"name\": \"" + e->get().method_name + "\",\n");
source.push_back("\t\t\t\t\"return_type\": \"" + e->get().return_type + "\",\n");
source.push_back(String("\t\t\t\t\"is_editor\": ") + (e->get().is_editor ? "true" : "false") + ",\n");
source.push_back(String("\t\t\t\t\"is_noscript\": ") + (e->get().is_noscript ? "true" : "false") + ",\n");
source.push_back(String("\t\t\t\t\"is_const\": ") + (e->get().is_const ? "true" : "false") + ",\n");
source.push_back(String("\t\t\t\t\"is_reverse\": ") + (e->get().is_reverse ? "true" : "false") + ",\n");
source.push_back(String("\t\t\t\t\"is_virtual\": ") + (e->get().is_virtual ? "true" : "false") + ",\n");
source.push_back(String("\t\t\t\t\"has_varargs\": ") + (e->get().has_varargs ? "true" : "false") + ",\n");
source.push_back(String("\t\t\t\t\"is_from_script\": ") + (e->get().is_from_script ? "true" : "false") + ",\n");
source.push_back("\t\t\t\t\"arguments\": [\n");
for (int i = 0; i < e->get().argument_names.size(); i++) {
source.push_back("\t\t\t\t\t{\n");
source.push_back("\t\t\t\t\t\t\"name\": \"" + e->get().argument_names[i] + "\",\n");
source.push_back("\t\t\t\t\t\t\"type\": \"" + e->get().argument_types[i] + "\",\n");
source.push_back(String("\t\t\t\t\t\t\"has_default_value\": ") + (e->get().default_arguments.has(i) ? "true" : "false") + ",\n");
source.push_back("\t\t\t\t\t\t\"default_value\": \"" + (e->get().default_arguments.has(i) ? (String)e->get().default_arguments[i] : "") + "\"\n");
source.push_back(String("\t\t\t\t\t}") + ((i < e->get().argument_names.size() - 1) ? "," : "") + "\n");
}
source.push_back("\t\t\t\t]\n");
source.push_back(String("\t\t\t}") + (e->next() ? "," : "") + "\n");
}
source.push_back("\t\t],\n");
source.push_back("\t\t\"enums\": [\n");
for (List<EnumAPI>::Element *e = api.enums.front(); e; e = e->next()) {
source.push_back("\t\t\t{\n");
source.push_back("\t\t\t\t\"name\": \"" + e->get().name + "\",\n");
source.push_back("\t\t\t\t\"values\": {\n");
for (List<Pair<int, String>>::Element *val_e = e->get().values.front(); val_e; val_e = val_e->next()) {
source.push_back("\t\t\t\t\t\"" + val_e->get().second + "\": " + itos(val_e->get().first));
source.push_back(String((val_e->next() ? "," : "")) + "\n");
}
source.push_back("\t\t\t\t}\n");
source.push_back(String("\t\t\t}") + (e->next() ? "," : "") + "\n");
}
source.push_back("\t\t]\n");
source.push_back(String("\t}") + (c->next() ? "," : "") + "\n");
}
source.push_back("]");
return source;
}
#endif
/*
* Saves the whole Pandemonium API to a JSON file located at
* p_path
*/
Error generate_c_api(const String &p_path) {
#ifndef TOOLS_ENABLED
return ERR_BUG;
#else
List<ClassAPI> api = generate_c_api_classes();
List<String> json_source = generate_c_api_json(api);
return save_file(p_path, json_source);
#endif
}
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