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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_SCAN_VSCAN_H
#define SCN_SCAN_VSCAN_H
#include "../detail/context.h"
#include "../detail/file.h"
#include "../detail/parse_context.h"
#include "../detail/visitor.h"
#include "common.h"
namespace scn {
SCN_BEGIN_NAMESPACE
// Avoid documentation issues: without this, Doxygen will think
// SCN_BEGIN_NAMESPACE is a part of the vscan declaration
namespace dummy {
}
/**
* Type returned by `vscan` and others
*/
template <typename WrappedRange>
struct vscan_result {
error err;
WrappedRange range;
};
namespace detail {
template <typename WrappedRange,
typename CharT = typename WrappedRange::char_type>
vscan_result<WrappedRange> vscan_boilerplate(
WrappedRange&& r,
basic_string_view<CharT> fmt,
basic_args<CharT> args)
{
auto ctx = make_context(SCN_MOVE(r));
auto pctx = make_parse_context(fmt, ctx.locale());
auto err = visit(ctx, pctx, SCN_MOVE(args));
return {err, SCN_MOVE(ctx.range())};
}
template <typename WrappedRange,
typename CharT = typename WrappedRange::char_type>
vscan_result<WrappedRange> vscan_boilerplate_default(
WrappedRange&& r,
int n_args,
basic_args<CharT> args)
{
auto ctx = make_context(SCN_MOVE(r));
auto pctx = make_parse_context(n_args, ctx.locale());
auto err = visit(ctx, pctx, SCN_MOVE(args));
return {err, SCN_MOVE(ctx.range())};
}
template <typename WrappedRange,
typename Format,
typename CharT = typename WrappedRange::char_type>
vscan_result<WrappedRange> vscan_boilerplate_localized(
WrappedRange&& r,
basic_locale_ref<CharT>&& loc,
const Format& fmt,
basic_args<CharT> args)
{
auto ctx = make_context(SCN_MOVE(r), SCN_MOVE(loc));
auto pctx = make_parse_context(fmt, ctx.locale());
auto err = visit(ctx, pctx, SCN_MOVE(args));
return {err, SCN_MOVE(ctx.range())};
}
} // namespace detail
/**
* In the spirit of {fmt}/`std::format` and `vformat`, `vscan` behaves
* similarly to \ref scan, except instead of taking a variadic argument
* pack, it takes an object of type `basic_args`, which type-erases the
* arguments to scan. This, in effect, will decrease generated code size and
* compile times dramatically.
*
* \param range Source range that has been wrapped with `detail::wrap`, and
* passed in as an rvalue.
* \param fmt Format string to use
* \param args Type-erased values to read
*/
template <typename WrappedRange,
typename CharT = typename WrappedRange::char_type>
vscan_result<WrappedRange> vscan(WrappedRange range,
basic_string_view<CharT> fmt,
basic_args<CharT>&& args)
{
return detail::vscan_boilerplate(SCN_MOVE(range), fmt, SCN_MOVE(args));
}
/**
* To be used with `scan_default`
*
* \param range Source range that has been wrapped with `detail::wrap`, and
* passed in as an rvalue.
* \param n_args Number of arguments in args
* \param args Type-erased values to read
*
* \see vscan
*/
template <typename WrappedRange,
typename CharT = typename WrappedRange::char_type>
vscan_result<WrappedRange> vscan_default(WrappedRange range,
int n_args,
basic_args<CharT>&& args)
{
return detail::vscan_boilerplate_default(SCN_MOVE(range), n_args,
SCN_MOVE(args));
}
/**
* To be used with `scan_localized`
*
* \param loc Locale to use
* \param range Source range that has been wrapped with `detail::wrap`, and
* passed in as an rvalue.
* \param fmt Format string to use
* \param args Type-erased values to read
*
* \see vscan
*/
template <typename WrappedRange,
typename CharT = typename WrappedRange::char_type>
vscan_result<WrappedRange> vscan_localized(WrappedRange range,
basic_locale_ref<CharT>&& loc,
basic_string_view<CharT> fmt,
basic_args<CharT>&& args)
{
return detail::vscan_boilerplate_localized(
SCN_MOVE(range), SCN_MOVE(loc), fmt, SCN_MOVE(args));
}
/**
* \see scan_usertype
* \see vscan
*/
template <typename WrappedRange,
typename CharT = typename WrappedRange::char_type>
error vscan_usertype(basic_context<WrappedRange>& ctx,
basic_string_view<CharT> f,
basic_args<CharT>&& args)
{
auto pctx = make_parse_context(f, ctx.locale());
return visit(ctx, pctx, SCN_MOVE(args));
}
#if !defined(SCN_HEADER_ONLY) || !SCN_HEADER_ONLY
#define SCN_VSCAN_DECLARE(Range, WrappedAlias, CharAlias) \
namespace detail { \
namespace vscan_macro { \
using WrappedAlias = range_wrapper_for_t<Range>; \
using CharAlias = typename WrappedAlias::char_type; \
} \
} \
vscan_result<detail::vscan_macro::WrappedAlias> vscan( \
detail::vscan_macro::WrappedAlias&&, \
basic_string_view<detail::vscan_macro::CharAlias>, \
basic_args<detail::vscan_macro::CharAlias>&&); \
\
vscan_result<detail::vscan_macro::WrappedAlias> vscan_default( \
detail::vscan_macro::WrappedAlias&&, int, \
basic_args<detail::vscan_macro::CharAlias>&&); \
\
vscan_result<detail::vscan_macro::WrappedAlias> vscan_localized( \
detail::vscan_macro::WrappedAlias&&, \
basic_locale_ref<detail::vscan_macro::CharAlias>&&, \
basic_string_view<detail::vscan_macro::CharAlias>, \
basic_args<detail::vscan_macro::CharAlias>&&); \
\
error vscan_usertype(basic_context<detail::vscan_macro::WrappedAlias>&, \
basic_string_view<detail::vscan_macro::CharAlias>, \
basic_args<detail::vscan_macro::CharAlias>&&)
SCN_VSCAN_DECLARE(string_view, string_view_wrapped, string_view_char);
SCN_VSCAN_DECLARE(wstring_view, wstring_view_wrapped, wstring_view_char);
SCN_VSCAN_DECLARE(std::string, string_wrapped, string_char);
SCN_VSCAN_DECLARE(std::wstring, wstring_wrapped, wstring_char);
SCN_VSCAN_DECLARE(file&, file_ref_wrapped, file_ref_char);
SCN_VSCAN_DECLARE(wfile&, wfile_ref_wrapped, wfile_ref_char);
#endif // !SCN_HEADER_ONLY
SCN_END_NAMESPACE
} // namespace scn
#if defined(SCN_HEADER_ONLY) && SCN_HEADER_ONLY && !defined(SCN_VSCAN_CPP)
#include "vscan.cpp"
#endif
#endif // SCN_SCAN_VSCAN_H
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