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#include <forstio/error.hpp>
#include <forstio/codec/data.hpp>
#include <forstio/codec/schema.hpp>
#include <forstio/codec/schema_stringify.hpp>
#include <forstio/templates.hpp>
#include <string>
#include <sstream>
#include <map>
#include <iostream>
namespace saw {
namespace schema {
using CVar = Struct<
Member<schema::String, "schema">,
Member<schema::String, "type">,
Member<schema::String, "name">
>;
using CStruct = Struct<
Member<schema::String, "schema">,
Member<schema::String, "name">,
Member<Array<CVar>, "members">
>;
using CFunction = Struct<
Member<schema::String, "schema">,
Member<schema::String, "name">,
Member<Array<CVar>, "params">,
Member<CVar, "return">
>;
using CIface = Struct<
Member<schema::String, "schema">,
Member<Array<CStruct>,"structs">,
Member<Array<CFunction>,"functions">
>;
}
/**
* Type meant to provide future help if I decide to introduce more maps
*/
/**
namespace schema {
using namespace saw::schema;
Pseudo flattened
using Foo = Struct<
Member<Array<Int32>, "a">
Member<Array<Float32>, "b">
>;
Needs to be flattened to
template<typename InnerSchema>
using FlattenedSchemaElement = Struct<
Member<Array<String>, "path">,
Member<InnerSchema, "inner_schema">
>;
// Illegal, but doable with more lines of code
// Just use typename... T and
// "T..." for
// "Member<FlattenedSchemaElement<Ele>,Names>...>"
// and specialize somewhere else
template<typename... Ele, string_literal... Names>
using FlattenedSchema = Struct<
Member<String, "top_schema">,
Member<FlattenedSchemaElement<Ele>, Names>...
>;
}
*/
template<typename T, typename Res>
struct schema_flattener {
static_assert(always_false<T>, "Not supported");
};
template<typename T0, string_literal Name0, typename... T, string_literal... Names, typename Res>
struct schema_flattener<schema::Struct<schema::Member<T0,Name0>,schema::Member<T,Names>...>, Res> {
};
/**
* Helper to determine if we are dealing with primitive types
*/
template<typename Schema>
struct c_is_primitive {
static constexpr bool value = false;
};
template<typename T, size_t N>
struct c_is_primitive<schema::Primitive<T,N>> {
static constexpr bool value = true;
};
template<typename Schema>
struct c_primitive_string {
static_assert(always_false<Schema>, "Not supported");
};
template<>
struct c_primitive_string<schema::Int8> {
static constexpr std::string_view value = "int8_t";
};
template<>
struct c_primitive_string<schema::Int16> {
static constexpr std::string_view value = "int16_t";
};
template<>
struct c_primitive_string<schema::Int32> {
static constexpr std::string_view value = "int32_t";
};
template<>
struct c_primitive_string<schema::Int64> {
static constexpr std::string_view value = "int64_t";
};
template<>
struct c_primitive_string<schema::UInt8> {
static constexpr std::string_view value = "uint8_t";
};
template<>
struct c_primitive_string<schema::UInt16> {
static constexpr std::string_view value = "uint16_t";
};
template<>
struct c_primitive_string<schema::UInt32> {
static constexpr std::string_view value = "uint32_t";
};
template<>
struct c_primitive_string<schema::UInt64> {
static constexpr std::string_view value = "uint64_t";
};
template<>
struct c_primitive_string<schema::Float32> {
static constexpr std::string_view value = "float";
};
template<>
struct c_primitive_string<schema::Float64> {
static constexpr std::string_view value = "double";
};
bool c_interface_function_exists(data<schema::CIface>& state, const std::string_view& name){
auto& funcs = state.template get<"functions">();
for(uint64_t i = 0; i < funcs.size(); ++i){
if(funcs.at(i).get<"name">() == name){
return true;
}
}
return false;
}
template<typename Schema>
struct c_data_translater {
static_assert(always_false<Schema>, "Not supported");
};
template<typename T, uint64_t N>
struct c_data_translater<schema::Primitive<T,N>> {
using Schema = schema::Primitive<T,N>;
static error_or<void> generate(data<schema::CIface>& state, data<schema::CVar>& prim){
/// @TODO Check if exists in CVars already
try{
std::stringstream iss;
schema_stringify<Schema>::apply(iss);
prim.template get<"schema">().set(iss.str());
}catch(const std::exception&){
return make_error<err::out_of_memory>();
}
return void_t{};
}
};
template<typename Req, typename Ret>
struct c_data_translater<schema::Function<Req,Ret>> {
using Schema = schema::Function<Req,Ret>;
static error_or<void> generate(data<schema::CIface>& state, const std::string_view& func_name){
if(c_interface_function_exists(state, func_name)){
return make_error<err::invalid_state>("Function already exists");
}
auto& funcs = state.template get<"functions">();
data<schema::CFunction> function;
function.template get<"name">().set(std::string{func_name});
try{
std::stringstream iss;
schema_stringify<Schema>::apply(iss);
function.template get<"schema">().set(iss.str());
}catch(const std::exception&){
return make_error<err::out_of_memory>();
}
// Return value
{
auto& c_var = function.template get<"return">();
c_var.template get<"name">().set("ret_val");
auto eov = c_data_translater<Ret>::generate(state, c_var);
if(eov.is_error()){
return eov;
}
}
// Request values
{
}
{
auto eov = funcs.add(std::move(function));
if(eov.is_error()){
return eov;
}
}
return void_t{};
}
};
template<typename... Funcs, string_literal... Names>
struct c_data_translater<schema::Interface<schema::Member<Funcs,Names>...>> {
using Schema = schema::Interface<schema::Member<Funcs, Names>...>;
template<std::size_t i>
static error_or<void> generate_ele(data<schema::CIface>& state){
using InnerSchema = typename parameter_pack_type<i, Funcs...>::type;
constexpr string_literal Literal = parameter_key_pack_type<i, Names...>::literal;
{
auto eov = c_data_translater<InnerSchema>::generate(state, Literal.view());
if(eov.is_error()){
return eov;
}
}
/**
* Continue if elements remain or finish
*/
if constexpr ( (i+1) < sizeof...(Funcs) ){
return generate_ele<i+1>(state);
}
return void_t{};
}
static error_or<void> generate(data<schema::CIface>& state){
try{
std::stringstream iss;
schema_stringify<Schema>::apply(iss);
state.template get<"schema">().set(iss.str());
}catch(const std::exception&){
return make_error<err::out_of_memory>();
}
if constexpr (sizeof...(Funcs) > 0){
return generate_ele<0>(state);
}
return void_t{};
}
};
template<typename Interface>
error_or<void> generate_c_interface(data<schema::CIface>& state){
auto eov = c_data_translater<Interface>::generate(state);
return eov;
}
}
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