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// Copyright 2017 Elias Kosunen
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file is a part of scnlib:
// https://github.com/eliaskosunen/scnlib
#ifndef SCN_DETAIL_CONTEXT_H
#define SCN_DETAIL_CONTEXT_H
#include "args.h"
namespace scn {
SCN_BEGIN_NAMESPACE
template <typename WrappedRange>
class basic_context {
public:
using range_type = WrappedRange;
using iterator = typename range_type::iterator;
using sentinel = typename range_type::sentinel;
using char_type = typename range_type::char_type;
using locale_type = basic_locale_ref<char_type>;
basic_context(range_type&& r) : m_range(SCN_MOVE(r)) {}
basic_context(range_type&& r, locale_type&& loc)
: m_range(SCN_MOVE(r)), m_locale(SCN_MOVE(loc))
{
}
SCN_NODISCARD iterator& begin()
{
return m_range.begin();
}
const sentinel& end() const
{
return m_range.end();
}
range_type& range() & noexcept
{
return m_range;
}
const range_type& range() const& noexcept
{
return m_range;
}
range_type range() && noexcept
{
return m_range;
}
locale_type& locale() noexcept
{
return m_locale;
}
const locale_type& locale() const noexcept
{
return m_locale;
}
private:
range_type m_range;
locale_type m_locale{};
};
template <typename WrappedRange,
typename CharT = typename WrappedRange::char_type>
basic_context<WrappedRange> make_context(WrappedRange r)
{
return {SCN_MOVE(r)};
}
template <typename WrappedRange, typename LocaleRef>
basic_context<WrappedRange> make_context(WrappedRange r, LocaleRef&& loc)
{
return {SCN_MOVE(r), SCN_FWD(loc)};
}
template <typename CharT>
auto get_arg(const basic_args<CharT>& args, std::ptrdiff_t id)
-> expected<basic_arg<CharT>>
{
auto a = args.get(id);
if (!a) {
return error(error::invalid_format_string,
"Argument id out of range");
}
return a;
}
template <typename CharT, typename ParseCtx>
auto get_arg(const basic_args<CharT>& args,
ParseCtx& pctx,
std::ptrdiff_t id) -> expected<basic_arg<CharT>>
{
return pctx.check_arg_id(id) ? get_arg(args, id)
: error(error::invalid_format_string,
"Argument id out of range");
}
template <typename CharT, typename ParseCtx>
auto get_arg(const basic_args<CharT>&, ParseCtx&, basic_string_view<CharT>)
-> expected<basic_arg<CharT>>
{
return error(error::invalid_format_string, "Argument id out of range");
}
template <typename CharT, typename ParseCtx>
auto next_arg(const basic_args<CharT>& args, ParseCtx& pctx)
-> expected<basic_arg<CharT>>
{
return get_arg(args, pctx.next_arg_id());
}
SCN_END_NAMESPACE
} // namespace scn
#endif // SCN_DETAIL_CONTEXT_H
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