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godot/modules/gdnative/nativescript/api_generator.cpp
Rémi Verschelde a7f49ac9a1 Update copyright statements to 2020 
Happy new year to the wonderful Godot community!

We're starting a new decade with a well-established, non-profit, free
and open source game engine, and tons of further improvements in the
pipeline from hundreds of contributors.

Godot will keep getting better, and we're looking forward to all the
games that the community will keep developing and releasing with it.
2020-01-01 11:16:22 +01:00

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/*************************************************************************/
/* api_generator.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 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 "api_generator.h"
#ifdef TOOLS_ENABLED
#include "core/class_db.h"
#include "core/engine.h"
#include "core/global_constants.h"
#include "core/os/file_access.h"
#include "core/pair.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 != NULL; 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;
Map<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;
Map<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 Godot 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 != NULL; 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);
// @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 != NULL; 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 != NULL; 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>();
for (List<MethodInfo>::Element *m = methods.front(); m != NULL; 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] == '_';
// 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(), NULL);
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 != NULL; 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("\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 Godot 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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