79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2017-2018, 2022 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include "../view.hpp"
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#include "enum.hpp"
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namespace cruft::parse {
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///////////////////////////////////////////////////////////////////////////
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/// Extracts an instance of a native type T from the string [first, last).
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///
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/// Throws std::invalid_argument when the type cannot be parsed.
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///
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/// The view is modified in place to reflect the unused data.
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template <typename T> T value (cruft::view<const char *> &);
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template <typename T> T value (cruft::view< char *> &);
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template <typename T> T value (std::string_view &str)
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{
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cruft::view wrapper (str);
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T res = value<T> (wrapper);
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str = str.substr (str.size () - wrapper.size ());
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return res;
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}
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/// Parses a prefix string to obtain an instance of T.
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///
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/// This only differs from `parse` in that it throws if the entire string
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/// isn't consumed during the parse, rather than reporting the remaining
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/// data.
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template <typename T>
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T
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from_string (cruft::view<const char*> data)
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{
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if constexpr (std::is_enum_v<T>) {
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return enumeration::from_string<T> (data);
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} else {
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T res = value<T> (data);
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if (!data.empty ())
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throw std::invalid_argument ("unable to parse");
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return res;
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}
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}
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///////////////////////////////////////////////////////////////////////////
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template <typename T>
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T
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from_string (const char *data)
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{
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return from_string<T> (cruft::view (data));
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}
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//-------------------------------------------------------------------------
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template <typename T>
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T
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from_string (std::string const &data)
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{
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return from_string<T> (cruft::view (data));
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}
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//-------------------------------------------------------------------------
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template <typename T>
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T
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from_string (std::string_view data)
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{
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return from_string<T> (cruft::view (data));
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}
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}
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