240 lines
11 KiB
C++
240 lines
11 KiB
C++
/** @file bu_store.hpp **/
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#pragma once
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//#include "bpu.hpp"
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#include "basis_unit.hpp"
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#include "xo/ratio/ratio.hpp"
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#include <array>
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#include <cstdint>
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namespace xo {
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namespace qty {
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using bpu_abbrev_type = flatstring<24>;
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using power_ratio_type = xo::ratio::ratio<std::int64_t>;
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namespace detail {
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/** @class bu_dim_store
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* @brief store basis-unit abbreviations for a particular dimension
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**/
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struct bu_dim_store {
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/** max number of basis-units per dimension **/
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static constexpr std::size_t max_bu_per_dim = 25;
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/** @defgroup bu-dim-store-type-traits bu-dim-store type traits **/
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///@{
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using entry_type = std::pair<scalefactor2x_ratio_type, bu_abbrev_type>;
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/* e.g.
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* [(1/1000000000, "nm"), (1/1000000, "um"), (1/1000, "mm"), (1/1, "m"), (1000/1, "km")]
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*/
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using native_scale_v = std::array<entry_type, max_bu_per_dim>;
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///@}
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public:
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constexpr bu_dim_store() = default;
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constexpr bool empty() const { return n_bu_ == 0; }
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constexpr std::size_t size() const { return n_bu_; }
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constexpr const entry_type & operator[](std::size_t i) const { return bu_abbrev_v_[i]; }
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/** @brief get least-upper-bound index position in bu_abbrev_v[]
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*
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* return value in [0, n] where n = .size()
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**/
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constexpr std::size_t abbrev_lub_ix(const scalefactor_ratio_type & scalefactor) const
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{
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if (n_bu_ == 0)
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return 0;
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std::size_t lo = 0;
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std::size_t hi = n_bu_-1;
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if (scalefactor <= bu_abbrev_v_[lo].first)
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return 0;
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auto cmp = (scalefactor <=> bu_abbrev_v_[hi].first);
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if (cmp > 0)
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return n_bu_;
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if (cmp == 0)
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return hi;
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while (hi-lo > 1) {
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/* inv:
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* bu_abbrev_v[lo].first < scalefactor <= bu_abbrev_v[hi].first
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*/
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std::size_t mid = lo + (hi - lo)/2;
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if (scalefactor > bu_abbrev_v_[mid].first)
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lo = mid;
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else
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hi = mid;
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}
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return hi;
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}
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constexpr void insert_aux(std::size_t ix,
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const entry_type & entry)
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{
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if (n_bu_ >= max_bu_per_dim)
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return;
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++n_bu_;
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for (std::size_t dest_ix = n_bu_; dest_ix > ix; --dest_ix)
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bu_abbrev_v_[dest_ix] = bu_abbrev_v_[dest_ix - 1];
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bu_abbrev_v_[ix] = entry;
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}
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/** @brief establish abbreviation @p abbrev for basis unit @p bu
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**/
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constexpr void bu_establish_abbrev(const scalefactor_ratio_type & scalefactor,
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const bu_abbrev_type & abbrev)
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{
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std::int32_t i_abbrev = this->abbrev_lub_ix(scalefactor);
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auto entry = std::make_pair(scalefactor, abbrev);
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if ((i_abbrev < bu_abbrev_v_.size())
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&& (bu_abbrev_v_[i_abbrev].first == scalefactor))
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{
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bu_abbrev_v_[i_abbrev] = entry;
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} else {
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this->insert_aux(i_abbrev, entry);
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}
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}
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public:
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/** @defgroup bu-dim-store-instance-vars bu-dim-store instance vars **/
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///@{
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std::size_t n_bu_ = 0;
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std::array<entry_type, max_bu_per_dim> bu_abbrev_v_;
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///@}
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}; /*bu_dim_store*/
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/** @class bu_store
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* @brief associate basis units with abbreviations
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**/
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struct bu_store {
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constexpr bu_store() {
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// ----- mass -----
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this->bu_establish_abbrev(detail::bu::picogram, bu_abbrev_type::from_chars("pg"));
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this->bu_establish_abbrev(detail::bu::nanogram, bu_abbrev_type::from_chars("ng"));
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this->bu_establish_abbrev(detail::bu::microgram, bu_abbrev_type::from_chars("ug"));
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this->bu_establish_abbrev(detail::bu::milligram, bu_abbrev_type::from_chars("mg"));
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this->bu_establish_abbrev(detail::bu::gram, bu_abbrev_type::from_chars("g"));
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this->bu_establish_abbrev(detail::bu::kilogram, bu_abbrev_type::from_chars("kg"));
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this->bu_establish_abbrev(detail::bu::tonne, bu_abbrev_type::from_chars("t"));
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this->bu_establish_abbrev(detail::bu::kilotonne, bu_abbrev_type::from_chars("kt"));
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this->bu_establish_abbrev(detail::bu::megatonne, bu_abbrev_type::from_chars("Mt"));
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this->bu_establish_abbrev(detail::bu::gigatonne, bu_abbrev_type::from_chars("Gt"));
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// ----- distance -----
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this->bu_establish_abbrev(detail::bu::picometer, bu_abbrev_type::from_chars("pm"));
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this->bu_establish_abbrev(detail::bu::nanometer, bu_abbrev_type::from_chars("nm"));
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this->bu_establish_abbrev(detail::bu::micrometer, bu_abbrev_type::from_chars("um"));
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this->bu_establish_abbrev(detail::bu::millimeter, bu_abbrev_type::from_chars("mm"));
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this->bu_establish_abbrev(detail::bu::meter, bu_abbrev_type::from_chars("m"));
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this->bu_establish_abbrev(detail::bu::kilometer, bu_abbrev_type::from_chars("km"));
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this->bu_establish_abbrev(detail::bu::megameter, bu_abbrev_type::from_chars("Mm"));
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this->bu_establish_abbrev(detail::bu::gigameter, bu_abbrev_type::from_chars("Gm"));
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this->bu_establish_abbrev(detail::bu::lightsecond, bu_abbrev_type::from_chars("lsec"));
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this->bu_establish_abbrev(detail::bu::astronomicalunit, bu_abbrev_type::from_chars("AU"));
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this->bu_establish_abbrev(detail::bu::inch, bu_abbrev_type::from_chars("in"));
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this->bu_establish_abbrev(detail::bu::foot, bu_abbrev_type::from_chars("ft"));
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this->bu_establish_abbrev(detail::bu::yard, bu_abbrev_type::from_chars("yd"));
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this->bu_establish_abbrev(detail::bu::mile, bu_abbrev_type::from_chars("mi"));
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// ----- time -----
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this->bu_establish_abbrev(detail::bu::picosecond, bu_abbrev_type::from_chars("ps"));
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this->bu_establish_abbrev(detail::bu::nanosecond, bu_abbrev_type::from_chars("ns"));
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this->bu_establish_abbrev(detail::bu::microsecond, bu_abbrev_type::from_chars("us"));
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this->bu_establish_abbrev(detail::bu::millisecond, bu_abbrev_type::from_chars("ms"));
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this->bu_establish_abbrev(detail::bu::second, bu_abbrev_type::from_chars("s"));
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this->bu_establish_abbrev(detail::bu::minute, bu_abbrev_type::from_chars("min"));
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this->bu_establish_abbrev(detail::bu::hour, bu_abbrev_type::from_chars("hr"));
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this->bu_establish_abbrev(detail::bu::day, bu_abbrev_type::from_chars("dy"));
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this->bu_establish_abbrev(detail::bu::week, bu_abbrev_type::from_chars("wk"));
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this->bu_establish_abbrev(detail::bu::month, bu_abbrev_type::from_chars("mo"));
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this->bu_establish_abbrev(detail::bu::year250, bu_abbrev_type::from_chars("yr250"));
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this->bu_establish_abbrev(detail::bu::year, bu_abbrev_type::from_chars("yr"));
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this->bu_establish_abbrev(detail::bu::year360, bu_abbrev_type::from_chars("yr360"));
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this->bu_establish_abbrev(detail::bu::year365, bu_abbrev_type::from_chars("yr365"));
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// ----- misc (currency, price) -----
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this->bu_establish_abbrev(detail::bu::currency, bu_abbrev_type::from_chars("ccy"));
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this->bu_establish_abbrev(detail::bu::price, bu_abbrev_type::from_chars("px"));
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}
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static constexpr bu_abbrev_type
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bu_fallback_abbrev(dim basis_dim,
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const scalefactor_ratio_type & scalefactor)
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{
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return (bu_abbrev_type::from_flatstring
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(flatstring_concat
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(scalefactor.to_str<bu_abbrev_type::fixed_capacity>(),
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native_unit2_v[static_cast<std::uint32_t>(basis_dim)].abbrev_str())));
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}
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/** @brief get basis-unit abbreviation at runtime **/
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constexpr bu_abbrev_type bu_abbrev(const basis_unit & bu) const
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{
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const auto & bu_abbrev_v = bu_abbrev_vv_[static_cast<std::size_t>(bu.native_dim())];
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std::size_t i_abbrev = bu_abbrev_v.abbrev_lub_ix(bu.scalefactor());
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if ((i_abbrev < bu_abbrev_v.size())
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&& (bu_abbrev_v[i_abbrev].first == bu.scalefactor()))
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{
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return bu_abbrev_v[i_abbrev].second;
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} else {
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return bu_fallback_abbrev(bu.native_dim(), bu.scalefactor());
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}
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}
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constexpr void bu_establish_abbrev(const basis_unit & bu,
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const bu_abbrev_type & abbrev) {
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auto & dim_store = bu_abbrev_vv_[static_cast<std::size_t>(bu.native_dim_)];
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dim_store.bu_establish_abbrev(bu.scalefactor_, abbrev);
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}
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public:
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/** **/
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std::array<bu_dim_store, n_dim> bu_abbrev_vv_;
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};
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} /*namespace detail*/
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/** @brief global abbreviation store.
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*
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* @note
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* Extending the contents of this store at runtime is not supported,
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* in favor of preserving constexpr abbreviations.
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**/
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static constexpr detail::bu_store bu_abbrev_store;
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/** @brief get abbreviation for basis-unit @p bu **/
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constexpr bu_abbrev_type
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bu_abbrev(const basis_unit & bu)
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{
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return bu_abbrev_store.bu_abbrev(bu);
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}
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} /*namespace qty*/
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} /*namespace xo*/
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/** end bu_store.hpp **/
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