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#pragma once
#include <forstio/string_literal.h>
#include "schema.h"
namespace saw {
struct schema_hash_combine {
static constexpr uint64_t apply(uint64_t seed, uint64_t v){
return seed ^( std::hash<uint64_t>{}(v) + 0x9e3779b9 + (seed<<6) + (seed >> 2));
}
};
template<string_literal lit>
struct hash_literal {
static constexpr uint64_t apply(uint64_t seed){
constexpr std::string_view view = lit.view();
for(uint64_t i = 0; i < view.size(); ++i){
seed = schema_hash_combine::apply(seed, static_cast<uint64_t>(view[i]));
}
return seed;
}
};
template<typename Schema>
struct schema_hash_seed {
static_assert(always_false<Schema>, "Not schema_hashable");
};
template<>
struct schema_hash_seed<schema::SignedInteger> {
using Schema = schema::SignedInteger;
static constexpr uint64_t apply(uint64_t seed){
return hash_literal<Schema::name>::apply(seed);
}
};
template<>
struct schema_hash_seed<schema::UnsignedInteger> {
using Schema = schema::UnsignedInteger;
static constexpr uint64_t apply(uint64_t seed){
return hash_literal<Schema::name>::apply(seed);
}
};
template<>
struct schema_hash_seed<schema::FloatingPoint> {
using Schema = schema::FloatingPoint;
static constexpr uint64_t apply(uint64_t seed){
return hash_literal<Schema::name>::apply(seed);
}
};
template<>
struct schema_hash_seed<schema::String> {
using Schema = schema::String;
static constexpr uint64_t apply(uint64_t seed){
return hash_literal<Schema::name>::apply(seed);
}
};
template<typename P, uint64_t N>
struct schema_hash_seed<schema::Primitive<P,N>> {
using Schema = schema::Primitive<P,N>;
static constexpr uint64_t apply(uint64_t seed){
seed = hash_literal<Schema::name>::apply(seed);
seed = schema_hash_seed<P>::apply(seed);
seed = schema_hash_combine::apply(seed, N);
return seed;
}
};
template<typename T, uint64_t N>
struct schema_hash_seed<schema::Array<T,N>> {
using Schema = schema::Array<T,N>;
static constexpr uint64_t apply(uint64_t seed){
seed = hash_literal<Schema::name>::apply(seed);
seed = schema_hash_seed<T>::apply(seed);
seed = schema_hash_combine::apply(seed, N);
return seed;
}
};
template<typename... V, string_literal... K>
struct schema_hash_seed<schema::Struct<schema::Member<V,K>...>> {
using Schema = schema::Struct<schema::Member<V,K>...>;
template<uint64_t i>
static constexpr uint64_t apply_ele(uint64_t seed){
using Type = typename parameter_pack_type<i,V...>::type;
constexpr string_literal Lit = parameter_key_pack_type<i,K...>::literal;
using MemberT = typename parameter_pack_type<i,schema::Member<V,K>...>::type;
seed = hash_literal<MemberT::name>::apply(seed);
seed = schema_hash_seed<Type>::apply(seed);
seed = hash_literal<Lit>::apply(seed);
if constexpr ( (i+1) < sizeof...(V) ){
return apply_ele<i+1>(seed);
}
return seed;
}
static constexpr uint64_t apply(uint64_t seed){
seed = hash_literal<Schema::name>::apply(seed);
if constexpr (sizeof...(V) > 0){
seed = apply_ele<0>(seed);
}
return seed;
}
};
template<typename Schema>
struct schema_hash {
static constexpr uint64_t apply() {
constexpr uint64_t seed = 0;
return schema_hash_seed<Schema>::apply(seed);
}
};
}
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