98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
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#pragma once
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/*
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MIT License
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Copyright (c) 2024 - 2026 René Amthor (tobid7)
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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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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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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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*/
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#include <pd/core/color.hpp>
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template <>
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struct std::formatter<PD::Color> : std::formatter<std::string> {
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enum class ColorFmt {
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Hex,
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Rgbf,
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Rgb,
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Rgba,
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Rgbaf,
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};
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ColorFmt mode = ColorFmt::Hex;
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constexpr auto parse(std::format_parse_context& ctx) {
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auto it = ctx.begin();
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auto end = ctx.end();
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if (it == end || *it == '}') return it;
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if (check(it, end, 5, "rgbaf")) {
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mode = ColorFmt::Rgbaf;
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it += 5;
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} else if (check(it, end, 4, "rgba")) {
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mode = ColorFmt::Rgba;
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it += 4;
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} else if (check(it, end, 4, "rgbf")) {
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mode = ColorFmt::Rgbf;
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it += 4;
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} else if (check(it, end, 3, "rgb")) {
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mode = ColorFmt::Rgb;
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it += 3;
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} else if (check(it, end, 3, "hex")) {
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mode = ColorFmt::Hex;
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it += 3;
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} else {
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throw std::format_error("invalid format for PD::Color");
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}
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if (it == end || *it != '}')
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throw std::format_error("invalid format for PD::Color");
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return it;
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}
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template <typename FormatContext>
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auto format(const PD::Color& value, FormatContext& ctx) const {
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switch (mode) {
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case ColorFmt::Hex:
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return std::format_to(ctx.out(), "#{:02X}{:02X}{:02X}{:02X}", value.r,
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value.g, value.b, value.a);
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case ColorFmt::Rgb:
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return std::format_to(ctx.out(), "{}, {}, {}", value.r, value.g,
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value.b);
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case ColorFmt::Rgba:
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return std::format_to(ctx.out(), "{}, {}, {}, {}", value.r, value.g,
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value.b, value.a);
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case ColorFmt::Rgbf:
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return std::format_to(ctx.out(), "{}, {}, {}", value.rf(), value.gf(),
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value.bf());
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case ColorFmt::Rgbaf:
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return std::format_to(ctx.out(), "{}, {}, {}, {}", value.rf(),
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value.gf(), value.bf(), value.af());
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default:
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return ctx.out();
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}
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}
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constexpr bool check(std::format_parse_context::const_iterator it,
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std::format_parse_context::const_iterator end,
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size_t len, const char* what) {
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return (end - it >= static_cast<std::ptrdiff_t>(len) &&
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std::string_view(it, len) == what);
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}
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};
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