205 lines
7.8 KiB
C++
205 lines
7.8 KiB
C++
/** @file basis_unit_abbrev.hpp
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*
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* Author: Roland Conybeare
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**/
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#pragma once
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#include "native_unit.hpp"
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#include "xo/ratio/ratio.hpp"
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//#include <cstdint>
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namespace xo {
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namespace qty {
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using basis_unit2_abbrev_type = flatstring<16>;
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using scalefactor_ratio_type = xo::ratio::ratio<std::int64_t>;
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namespace abbrev {
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static
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constexpr basis_unit2_abbrev_type
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fallback_unit_abbrev(const scalefactor_ratio_type & scalefactor,
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dim native_dim)
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{
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/* e.g. unit of '1000 grams' will have abbrev '1000g' in absence
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* of a specialization for scaled_native_unit_abbrev
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*/
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return (basis_unit2_abbrev_type::from_flatstring
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(flatstring_concat
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(scalefactor.to_str<basis_unit2_abbrev_type::fixed_capacity>(),
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native_unit2_v[static_cast<std::uint32_t>(native_dim)].abbrev_str())));
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}
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// ----- units for dim::mass -----
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static
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constexpr basis_unit2_abbrev_type
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mass_unit2_abbrev(const scalefactor_ratio_type & scalefactor)
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{
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if (scalefactor.num() == 1) {
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switch (scalefactor.den()) {
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case 1:
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return basis_unit2_abbrev_type::from_chars("g");
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case 1000:
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return basis_unit2_abbrev_type::from_chars("mg");
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case 1000000:
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return basis_unit2_abbrev_type::from_chars("ug");
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case 1000000000:
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return basis_unit2_abbrev_type::from_chars("ng");
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}
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}
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if (scalefactor.den() == 1) {
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switch (scalefactor.num()) {
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case 1000:
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return basis_unit2_abbrev_type::from_chars("kg");
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case 1000000:
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return basis_unit2_abbrev_type::from_chars("t");
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case 1000000000:
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return basis_unit2_abbrev_type::from_chars("kt");
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}
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}
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return fallback_unit_abbrev(scalefactor, dim::mass);
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}
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// ----- units for dim::distance -----
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static
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constexpr basis_unit2_abbrev_type
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distance_unit2_abbrev(const scalefactor_ratio_type & scalefactor)
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{
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if (scalefactor.num() == 1) {
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switch (scalefactor.den()) {
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case 1:
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return basis_unit2_abbrev_type::from_chars("m");
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case 1000:
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return basis_unit2_abbrev_type::from_chars("mm");
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case 1000000:
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return basis_unit2_abbrev_type::from_chars("um");
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case 1000000000:
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return basis_unit2_abbrev_type::from_chars("nm");
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}
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}
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if (scalefactor.den() == 1) {
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switch (scalefactor.num()) {
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case 1000:
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return basis_unit2_abbrev_type::from_chars("km");
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case 1000000:
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return basis_unit2_abbrev_type::from_chars("Mm");
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case 1000000000:
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return basis_unit2_abbrev_type::from_chars("Gm");
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}
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}
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return fallback_unit_abbrev(scalefactor, dim::distance);
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}
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// ----- units for dim::time -----
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static
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constexpr basis_unit2_abbrev_type
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time_unit2_abbrev(const scalefactor_ratio_type & scalefactor)
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{
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if (scalefactor.num() == 1) {
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switch (scalefactor.den()) {
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case 1:
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return basis_unit2_abbrev_type::from_chars("s");
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case 1000:
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return basis_unit2_abbrev_type::from_chars("ms");
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case 1000000:
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return basis_unit2_abbrev_type::from_chars("us");
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case 1000000000:
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return basis_unit2_abbrev_type::from_chars("ns");
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}
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}
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if (scalefactor.den() == 1) {
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switch (scalefactor.num()) {
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case 60:
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return basis_unit2_abbrev_type::from_chars("min");
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case 3600:
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return basis_unit2_abbrev_type::from_chars("hr");
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case 24*3600:
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return basis_unit2_abbrev_type::from_chars("dy");
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case 7*24*3600:
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return basis_unit2_abbrev_type::from_chars("wk");
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case 30*24*3600:
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return basis_unit2_abbrev_type::from_chars("mo");
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case 250*24*3600:
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return basis_unit2_abbrev_type::from_chars("yr250");
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case 360*24*3600:
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return basis_unit2_abbrev_type::from_chars("yr360");
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case 365*24*3600:
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return basis_unit2_abbrev_type::from_chars("yr365");
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}
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}
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return fallback_unit_abbrev(scalefactor, dim::time);
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}
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// ----- units for dim::currency -----
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static constexpr basis_unit2_abbrev_type
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currency_unit2_abbrev(const scalefactor_ratio_type & scalefactor)
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{
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if (scalefactor.num() == 1) {
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switch(scalefactor.den()) {
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case 1:
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return basis_unit2_abbrev_type::from_chars("ccy");
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}
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}
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return fallback_unit_abbrev(scalefactor, dim::currency);
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}
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// ----- units for dim::price -----
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static constexpr basis_unit2_abbrev_type
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price_unit2_abbrev(const scalefactor_ratio_type & scalefactor)
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{
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if (scalefactor.num() == 1) {
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switch(scalefactor.den()) {
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case 1:
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return basis_unit2_abbrev_type::from_chars("ccy");
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}
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}
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return fallback_unit_abbrev(scalefactor, dim::price);
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}
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static
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constexpr basis_unit2_abbrev_type
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basis_unit2_abbrev(dim native_dim,
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const scalefactor_ratio_type & scalefactor)
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{
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switch(native_dim) {
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case dim::mass:
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return mass_unit2_abbrev(scalefactor);
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case dim::distance:
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return distance_unit2_abbrev(scalefactor);
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case dim::time:
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return time_unit2_abbrev(scalefactor);
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case dim::currency:
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return currency_unit2_abbrev(scalefactor);
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case dim::price:
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return price_unit2_abbrev(scalefactor);
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case dim::invalid:
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case dim::n_dim:
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break;
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}
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/* e.g. unit of '1000 grams' will have abbrev '1000g' in absence
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* of a specialization for scaled_native_unit_abbrev
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*/
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return (basis_unit2_abbrev_type::from_flatstring
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(flatstring_concat
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(scalefactor.to_str<basis_unit2_abbrev_type::fixed_capacity>(),
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native_unit2_v[static_cast<std::uint32_t>(native_dim)].abbrev_str())));
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}
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} /*namespace abbrev*/
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} /*namespace qty*/
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} /*namespace xo*/
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/** end basis_unit_abbrev.hpp **/
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