libcruft-util/parse/value.hpp
2020-01-28 14:13:03 +11:00

62 lines
1.8 KiB
C++

/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2017-2018 Danny Robson <danny@nerdcruft.net>
*/
#pragma once
#include "../view.hpp"
#include "enum.hpp"
namespace cruft::parse {
///////////////////////////////////////////////////////////////////////////
/// Extracts an instance of a native type T from the string [first, last).
///
/// Throws std::invalid_argument when the type cannot be parsed.
///
/// The view is modified in place to reflect the unused data.
template <typename T> T value (cruft::view<const char *> &);
template <typename T> T value (cruft::view< char *> &);
/// Parses a prefix string to obtain an instance of T.
///
/// This only differs from `parse` in that it throws if the entire string
/// isn't consumed during the parse, rather than reporting the remaining
/// data.
template <typename T>
T
from_string (cruft::view<const char*> data)
{
if constexpr (std::is_enum_v<T>) {
return enumeration::from_string<T> (data);
} else {
T res = value<T> (data);
if (!data.empty ())
throw std::invalid_argument ("unable to parse");
return res;
}
}
///////////////////////////////////////////////////////////////////////////
template <typename T>
T
from_string (const char *data)
{
return from_string<T> (cruft::view (data));
}
//-------------------------------------------------------------------------
template <typename T>
T
from_string (std::string const &data)
{
return from_string<T> (cruft::view (data));
}
}