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// SPDX-FileCopyrightText: 2026 Progmasoft <support@progmasoft.com>
// SPDX-License-Identifier: MPL-2.0 WITH AdditionRef-Progmasoft-Exception-2.0
#include <array>
#include <fmt/format.h>
#include <limits>
#include "Progmasoft/Tazelish/Version.hpp"
namespace Progmasoft::Tazelish
{
namespace
{
constexpr std::string_view kUnstable = "unstable";
constexpr std::string_view kNightly = "nightly";
std::optional<Channel>
ParseChannel(std::string_view text)
{
if (text == kUnstable)
{
return Channel::kUnstable;
}
if (text == kNightly)
{
return Channel::kNightly;
}
return std::nullopt;
}
std::string_view
ChannelName(Channel channel)
{
return channel == Channel::kUnstable ? kUnstable : kNightly;
}
bool
IsDigit(char character)
{
return character >= '0' && character <= '9';
}
// A number of digits only, without a leading zero unless it is zero.
std::optional<std::uint32_t>
ParseNumber(std::string_view text)
{
if (text.empty() || (text.size() > 1 && text.front() == '0'))
{
return std::nullopt;
}
std::uint64_t value = 0;
for (const char character : text)
{
if (!IsDigit(character))
{
return std::nullopt;
}
value
= value * 10 + static_cast<std::uint64_t>(character - '0');
if (value > std::numeric_limits<std::uint32_t>::max())
{
return std::nullopt;
}
}
return static_cast<std::uint32_t>(value);
}
std::optional<Release>
ParseRelease(std::string_view text)
{
std::array<std::uint32_t, 4> numbers{};
for (std::size_t index = 0; index < numbers.size(); ++index)
{
const std::size_t dot = text.find('.');
const bool last = index + 1 == numbers.size();
if (last != (dot == std::string_view::npos))
{
return std::nullopt;
}
const auto number = ParseNumber(text.substr(0, dot));
if (!number)
{
return std::nullopt;
}
numbers[index] = *number;
text = last ? std::string_view{} : text.substr(dot + 1);
}
return Release{ numbers[0], numbers[1], numbers[2], numbers[3] };
}
// Exactly [width] digits; leading zeros belong to a date.
std::optional<std::uint32_t>
ParseFixed(std::string_view text, std::size_t width)
{
if (text.size() != width)
{
return std::nullopt;
}
std::uint32_t value = 0;
for (const char character : text)
{
if (!IsDigit(character))
{
return std::nullopt;
}
value
= value * 10 + static_cast<std::uint32_t>(character - '0');
}
return value;
}
bool
IsLeapYear(std::uint32_t year)
{
return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
}
std::uint32_t
DaysInMonth(std::uint32_t year, std::uint32_t month)
{
constexpr std::array<std::uint32_t, 12> kDays
= { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
return month == 2 && IsLeapYear(year) ? 29 : kDays[month - 1];
}
// YYYY-MM-DD-channel, with a date the calendar has.
std::optional<Dated>
ParseDated(std::string_view text)
{
constexpr std::size_t kDateLength = 10;
if (text.size() <= kDateLength + 1 || text[4] != '-'
|| text[7] != '-' || text[kDateLength] != '-')
{
return std::nullopt;
}
const auto year = ParseFixed(text.substr(0, 4), 4);
const auto month = ParseFixed(text.substr(5, 2), 2);
const auto day = ParseFixed(text.substr(8, 2), 2);
const auto channel = ParseChannel(text.substr(kDateLength + 1));
if (!year || !month || !day || !channel || *year == 0 || *month == 0
|| *month > 12 || *day == 0
|| *day > DaysInMonth(*year, *month))
{
return std::nullopt;
}
return Dated{ static_cast<std::uint16_t>(*year),
static_cast<std::uint8_t>(*month),
static_cast<std::uint8_t>(*day),
*channel };
}
} // namespace
std::optional<Version>
ParseVersion(std::string_view text)
{
if (const auto channel = ParseChannel(text))
{
return Newest{ *channel };
}
if (const auto release = ParseRelease(text))
{
return *release;
}
if (const auto dated = ParseDated(text))
{
return *dated;
}
return std::nullopt;
}
std::string
FormatVersion(const Version &version)
{
if (const auto *release = std::get_if<Release>(&version))
{
return fmt::format("{}.{}.{}.{}",
release->majorNumber,
release->semimajorNumber,
release->minorNumber,
release->patchNumber);
}
if (const auto *newest = std::get_if<Newest>(&version))
{
return std::string(ChannelName(newest->channel));
}
const auto &dated = std::get<Dated>(version);
return fmt::format("{:04}-{:02}-{:02}-{}",
dated.year,
dated.month,
dated.day,
ChannelName(dated.channel));
}
} // namespace Progmasoft::Tazelish
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