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185 lines
5.8 KiB
C++
185 lines
5.8 KiB
C++
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#ifndef _C4_STD_TUPLE_HPP_
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#define _C4_STD_TUPLE_HPP_
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/** @file tuple.hpp */
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#ifndef C4CORE_SINGLE_HEADER
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#include "c4/format.hpp"
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#endif
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#include <tuple>
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/** this is a work in progress */
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#undef C4_TUPLE_TO_CHARS
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namespace c4 {
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#ifdef C4_TUPLE_TO_CHARS
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namespace detail {
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template< size_t Curr, class... Types >
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struct tuple_helper
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{
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static size_t do_cat(substr buf, std::tuple< Types... > const& tp)
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{
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size_t num = to_chars(buf, std::get<Curr>(tp));
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buf = buf.len >= num ? buf.sub(num) : substr{};
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num += tuple_helper< Curr+1, Types... >::do_cat(buf, tp);
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return num;
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}
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static size_t do_uncat(csubstr buf, std::tuple< Types... > & tp)
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{
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size_t num = from_str_trim(buf, &std::get<Curr>(tp));
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if(num == csubstr::npos) return csubstr::npos;
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buf = buf.len >= num ? buf.sub(num) : substr{};
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num += tuple_helper< Curr+1, Types... >::do_uncat(buf, tp);
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return num;
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}
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template< class Sep >
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static size_t do_catsep_more(substr buf, Sep const& sep, std::tuple< Types... > const& tp)
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{
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size_t ret = to_chars(buf, sep), num = ret;
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buf = buf.len >= ret ? buf.sub(ret) : substr{};
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ret = to_chars(buf, std::get<Curr>(tp));
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num += ret;
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buf = buf.len >= ret ? buf.sub(ret) : substr{};
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ret = tuple_helper< Curr+1, Types... >::do_catsep_more(buf, sep, tp);
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num += ret;
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return num;
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}
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template< class Sep >
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static size_t do_uncatsep_more(csubstr buf, Sep & sep, std::tuple< Types... > & tp)
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{
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size_t ret = from_str_trim(buf, &sep), num = ret;
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if(ret == csubstr::npos) return csubstr::npos;
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buf = buf.len >= ret ? buf.sub(ret) : substr{};
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ret = from_str_trim(buf, &std::get<Curr>(tp));
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if(ret == csubstr::npos) return csubstr::npos;
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num += ret;
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buf = buf.len >= ret ? buf.sub(ret) : substr{};
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ret = tuple_helper< Curr+1, Types... >::do_uncatsep_more(buf, sep, tp);
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if(ret == csubstr::npos) return csubstr::npos;
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num += ret;
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return num;
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}
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static size_t do_format(substr buf, csubstr fmt, std::tuple< Types... > const& tp)
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{
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auto pos = fmt.find("{}");
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if(pos != csubstr::npos)
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{
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size_t num = to_chars(buf, fmt.sub(0, pos));
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size_t out = num;
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buf = buf.len >= num ? buf.sub(num) : substr{};
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num = to_chars(buf, std::get<Curr>(tp));
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out += num;
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buf = buf.len >= num ? buf.sub(num) : substr{};
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num = tuple_helper< Curr+1, Types... >::do_format(buf, fmt.sub(pos + 2), tp);
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out += num;
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return out;
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}
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else
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{
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return format(buf, fmt);
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}
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}
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static size_t do_unformat(csubstr buf, csubstr fmt, std::tuple< Types... > & tp)
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{
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auto pos = fmt.find("{}");
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if(pos != csubstr::npos)
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{
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size_t num = pos;
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size_t out = num;
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buf = buf.len >= num ? buf.sub(num) : substr{};
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num = from_str_trim(buf, &std::get<Curr>(tp));
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out += num;
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buf = buf.len >= num ? buf.sub(num) : substr{};
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num = tuple_helper< Curr+1, Types... >::do_unformat(buf, fmt.sub(pos + 2), tp);
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out += num;
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return out;
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}
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else
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{
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return tuple_helper< sizeof...(Types), Types... >::do_unformat(buf, fmt, tp);
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}
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}
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};
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/** @todo VS compilation fails for this class */
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template< class... Types >
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struct tuple_helper< sizeof...(Types), Types... >
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{
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static size_t do_cat(substr /*buf*/, std::tuple<Types...> const& /*tp*/) { return 0; }
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static size_t do_uncat(csubstr /*buf*/, std::tuple<Types...> & /*tp*/) { return 0; }
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template< class Sep > static size_t do_catsep_more(substr /*buf*/, Sep const& /*sep*/, std::tuple<Types...> const& /*tp*/) { return 0; }
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template< class Sep > static size_t do_uncatsep_more(csubstr /*buf*/, Sep & /*sep*/, std::tuple<Types...> & /*tp*/) { return 0; }
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static size_t do_format(substr buf, csubstr fmt, std::tuple<Types...> const& /*tp*/)
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{
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return to_chars(buf, fmt);
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}
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static size_t do_unformat(csubstr buf, csubstr fmt, std::tuple<Types...> const& /*tp*/)
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{
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return 0;
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}
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};
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} // namespace detail
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template< class... Types >
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inline size_t cat(substr buf, std::tuple< Types... > const& tp)
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{
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return detail::tuple_helper< 0, Types... >::do_cat(buf, tp);
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}
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template< class... Types >
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inline size_t uncat(csubstr buf, std::tuple< Types... > & tp)
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{
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return detail::tuple_helper< 0, Types... >::do_uncat(buf, tp);
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}
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template< class Sep, class... Types >
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inline size_t catsep(substr buf, Sep const& sep, std::tuple< Types... > const& tp)
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{
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size_t num = to_chars(buf, std::cref(std::get<0>(tp)));
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buf = buf.len >= num ? buf.sub(num) : substr{};
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num += detail::tuple_helper< 1, Types... >::do_catsep_more(buf, sep, tp);
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return num;
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}
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template< class Sep, class... Types >
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inline size_t uncatsep(csubstr buf, Sep & sep, std::tuple< Types... > & tp)
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{
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size_t ret = from_str_trim(buf, &std::get<0>(tp)), num = ret;
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if(ret == csubstr::npos) return csubstr::npos;
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buf = buf.len >= ret ? buf.sub(ret) : substr{};
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ret = detail::tuple_helper< 1, Types... >::do_uncatsep_more(buf, sep, tp);
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if(ret == csubstr::npos) return csubstr::npos;
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num += ret;
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return num;
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}
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template< class... Types >
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inline size_t format(substr buf, csubstr fmt, std::tuple< Types... > const& tp)
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{
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return detail::tuple_helper< 0, Types... >::do_format(buf, fmt, tp);
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}
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template< class... Types >
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inline size_t unformat(csubstr buf, csubstr fmt, std::tuple< Types... > & tp)
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{
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return detail::tuple_helper< 0, Types... >::do_unformat(buf, fmt, tp);
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}
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#endif // C4_TUPLE_TO_CHARS
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} // namespace c4
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#endif /* _C4_STD_TUPLE_HPP_ */
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