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refactor: format_global_buffer() added

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Mateusz Pusz
2021-04-14 20:20:47 +02:00
parent e5cd7c80e7
commit 5781791a28
1 changed files with 35 additions and 29 deletions
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64
src/core-fmt/include/units/format.h
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@ -84,7 +84,7 @@ namespace units {
namespace detail {
// Holds specs about the whole object
template <typename CharT>
template<typename CharT>
struct global_format_specs
{
fmt::detail::fill_t<CharT> fill;
@ -256,6 +256,34 @@ namespace units {
return format_to(out, fmt::to_string(buffer), val);
}
// Creates a global format string
// e.g. "{:*^10%.1Q_%q}, 1.23_q_m" => "{:*^10}"
template<typename CharT, typename OutputIt>
inline OutputIt format_global_buffer(OutputIt out, const global_format_specs<CharT>& specs)
{
format_to(out, "{{:");
if (specs.fill.size() != 1 || specs.fill[0] != ' ') {
format_to(out, "{}", specs.fill.data());
}
switch (specs.align) {
case fmt::align_t::left:
format_to(out, "<");
break;
case fmt::align_t::right:
format_to(out, ">");
break;
case fmt::align_t::center:
format_to(out, "^");
break;
default:
break;
}
if (specs.width >= 1) {
format_to(out, "{}", specs.width);
}
return format_to(out, "}}");
}
template<typename OutputIt, typename Dimension, typename Unit, typename Rep, typename LocaleRef, typename CharT>
struct units_formatter {
OutputIt out;
@ -452,34 +480,6 @@ public:
fmt::detail::handle_dynamic_spec<fmt::detail::width_checker>(global_specs.width, width_ref, ctx);
fmt::detail::handle_dynamic_spec<fmt::detail::precision_checker>(rep_specs.precision, precision_ref, ctx);
// In `global_format_buffer` we will create a global format string
// e.g. "{:*^10%.1Q_%q}, 1.23_q_m" => "{:*^10}"
fmt::basic_memory_buffer<CharT> global_format_buffer;
auto to_gfb = std::back_inserter(global_format_buffer);
format_to(to_gfb, "{{:");
if (global_specs.fill.size() != 1 || global_specs.fill[0] != ' ') {
format_to(to_gfb, "{}", global_specs.fill.data());
}
if (auto align = global_specs.align; align != fmt::align_t::none) {
switch (align) {
case fmt::align_t::left:
format_to(to_gfb, "<");
break;
case fmt::align_t::right:
format_to(to_gfb, ">");
break;
case fmt::align_t::center:
format_to(to_gfb, "^");
break;
default:
break;
}
}
if (auto width = global_specs.width; width >= 1) {
format_to(to_gfb, "{}", width);
}
format_to(to_gfb, "}}");
// In `quantity_buffer` we will have the representation and the unit formatted according to their
// specification, ignoring global specifiers
// e.g. "{:*^10%.1Q_%q}, 1.23_q_m" => "1.2_m"
@ -502,6 +502,12 @@ public:
units::detail::units_formatter f(to_quantity_buffer, q, global_specs, rep_specs, unit_specs, ctx.locale());
parse_units_format(begin, end, f);
}
// In `global_format_buffer` we will create a global format string
// e.g. "{:*^10%.1Q_%q}, 1.23_q_m" => "{:*^10}"
fmt::basic_memory_buffer<CharT> global_format_buffer;
units::detail::format_global_buffer<CharT>(std::back_inserter(global_format_buffer), global_specs);
// Format the `quantity buffer` using specs from `global_format_buffer`
// In the example, equivalent to fmt::format("{:*^10}", "1.2_m")
return format_to(ctx.out(), fmt::to_string(global_format_buffer), fmt::to_string(quantity_buffer));