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#ifndef RFL_INTERNAL_TRANSFORMSNAKECASE_HPP_
#define RFL_INTERNAL_TRANSFORMSNAKECASE_HPP_
#include "StringLiteral.hpp"
namespace rfl::internal {
/// Capitalizes a lower-case character.
template <char c>
consteval char to_upper() {
if constexpr (c >= 'a' && c <= 'z') {
return c + ('A' - 'a');
} else {
return c;
}
}
template <char c>
consteval char to_lower() {
if constexpr (c >= 'A' && c <= 'Z') {
return c - ('A' - 'a');
} else {
return c;
}
}
/// Transforms the field name from snake case to camel case.
template <internal::StringLiteral _name, bool _capitalize, size_t _i = 0,
char... chars>
consteval auto transform_snake_case() {
if constexpr (_i == _name.arr_.size()) {
return StringLiteral<sizeof...(chars) + 1>(chars...);
} else if constexpr (_name.arr_[_i] == '_') {
return transform_snake_case<_name, true, _i + 1, chars...>();
} else if constexpr (_name.arr_[_i] == '\0') {
return transform_snake_case<_name, false, _name.arr_.size(), chars...>();
} else if constexpr (_capitalize) {
return transform_snake_case<_name, false, _i + 1, chars...,
to_upper<_name.arr_[_i]>()>();
} else if constexpr (sizeof...(chars) == 0) {
return transform_snake_case<_name, false, _i + 1,
to_lower<_name.arr_[_i]>()>();
} else {
return transform_snake_case<_name, false, _i + 1, chars...,
_name.arr_[_i]>();
}
}
} // namespace rfl::internal
#endif
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