forked from mpusz/mp-units
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2018 Mateusz Pusz
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#pragma once
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#include <units/bits/external/fixed_string.h>
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#include <units/bits/external/text_tools.h>
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#include <units/derived_dimension.h>
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namespace units::detail {
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template<bool Divide, std::size_t NegativeExpCount, std::size_t Idx>
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constexpr auto operator_text()
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{
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if constexpr(Idx == 0) {
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if constexpr(Divide && NegativeExpCount == 1) {
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return basic_fixed_string("1/");
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}
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else {
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return basic_fixed_string("");
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}
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}
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else {
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if constexpr(Divide && NegativeExpCount == 1) {
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return basic_fixed_string("/");
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}
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else {
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return basic_fixed_string("⋅");
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}
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}
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}
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template<typename E, basic_fixed_string Symbol, std::size_t NegativeExpCount, std::size_t Idx>
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constexpr auto exp_text()
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{
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// get calculation operator + symbol
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const auto txt = operator_text<E::num < 0, NegativeExpCount, Idx>() + Symbol;
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if constexpr(E::den != 1) {
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// add root part
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return txt + basic_fixed_string("^(") + regular<abs(E::num)>() + basic_fixed_string("/") + regular<E::den>() + basic_fixed_string(")");
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}
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else if constexpr(E::num != 1) {
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// add exponent part
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if constexpr(NegativeExpCount > 1) { // no '/' sign here (only negative exponents)
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return txt + superscript<E::num>();
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}
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else if constexpr(E::num != -1) { // -1 is replaced with '/' sign here
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return txt + superscript<abs(E::num)>();
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}
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else {
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return txt;
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}
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}
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else {
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return txt;
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}
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}
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template<typename... Es>
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inline constexpr int negative_exp_count = ((Es::num < 0 ? 1 : 0) + ...);
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template<typename... Us, typename... Es, std::size_t... Idxs>
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constexpr auto deduced_symbol_text(exp_list<Es...>, std::index_sequence<Idxs...>)
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{
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constexpr auto neg_exp = negative_exp_count<Es...>;
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return (exp_text<Es, Us::symbol, neg_exp, Idxs>() + ...);
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}
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template<DerivedDimension Dim, Unit... Us>
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constexpr auto deduced_symbol_text()
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{
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return deduced_symbol_text<Us...>(typename Dim::recipe(), std::index_sequence_for<Us...>());
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}
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} // namespace units::detail
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