Adding support for partial dates (only year or month), fixes #477

2025-01-19 23:50:39 +01:00
parent c73ff7dc03
commit 33759def78
27 changed files with 594 additions and 170 deletions
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2025 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "core/PartialDateTime.hpp"
+
+#include <iomanip>
+#include <limits>
+#include <sstream>
+
+namespace lms::core
+{
+    PartialDateTime::PartialDateTime(int year)
+        : _year{ static_cast<std::int16_t>(year) }
+        , _precision{ Precision::Year }
+    {
+    }
+
+    PartialDateTime::PartialDateTime(int year, unsigned month)
+        : _year{ static_cast<std::int16_t>(year) }
+        , _month{ static_cast<std::uint8_t>(month) }
+        , _precision{ Precision::Month }
+    {
+    }
+
+    PartialDateTime::PartialDateTime(int year, unsigned month, unsigned day)
+        : _year{ static_cast<std::int16_t>(year) }
+        , _month{ static_cast<std::uint8_t>(month) }
+        , _day{ static_cast<std::uint8_t>(day) }
+        , _precision{ Precision::Day }
+    {
+    }
+
+    PartialDateTime::PartialDateTime(int year, unsigned month, unsigned day, unsigned hour, unsigned min, unsigned sec)
+        : _year{ static_cast<std::int16_t>(year) }
+        , _month{ static_cast<std::uint8_t>(month) }
+        , _day{ static_cast<std::uint8_t>(day) }
+        , _hour{ static_cast<std::uint8_t>(hour) }
+        , _min{ static_cast<std::uint8_t>(min) }
+        , _sec{ static_cast<std::uint8_t>(sec) }
+        , _precision{ Precision::Sec }
+    {
+    }
+
+    PartialDateTime PartialDateTime::fromString(std::string_view str)
+    {
+        PartialDateTime res;
+
+        const std::string dateTimeStr{ str };
+
+        static constexpr const char* formats[]{
+            "%Y-%m-%dT%H:%M:%S",
+            "%Y-%m-%d %H:%M:%S",
+            "%Y/%m/%d %H:%M:%S",
+        };
+
+        for (const char* format : formats)
+        {
+            PartialDateTime candidate;
+
+            std::tm tm{};
+            tm.tm_year = std::numeric_limits<decltype(tm.tm_year)>::min();
+            tm.tm_mon = std::numeric_limits<decltype(tm.tm_mon)>::min();
+            tm.tm_mday = std::numeric_limits<decltype(tm.tm_mday)>::min();
+            tm.tm_hour = std::numeric_limits<decltype(tm.tm_hour)>::min();
+            tm.tm_min = std::numeric_limits<decltype(tm.tm_min)>::min();
+            tm.tm_sec = std::numeric_limits<decltype(tm.tm_sec)>::min();
+
+            std::istringstream ss{ dateTimeStr };
+            ss >> std::get_time(&tm, format);
+            if (ss.fail())
+                continue;
+
+            if (tm.tm_sec != std::numeric_limits<decltype(tm.tm_sec)>::min())
+            {
+                candidate._sec = tm.tm_sec;
+                candidate._precision = Precision::Sec;
+            }
+            if (tm.tm_min != std::numeric_limits<decltype(tm.tm_min)>::min())
+            {
+                candidate._min = tm.tm_min;
+                if (candidate._precision == Precision::Invalid)
+                    candidate._precision = Precision::Min;
+            }
+            if (tm.tm_hour != std::numeric_limits<decltype(tm.tm_hour)>::min())
+            {
+                candidate._hour = tm.tm_hour;
+                if (candidate._precision == Precision::Invalid)
+                    candidate._precision = Precision::Hour;
+            }
+            if (tm.tm_mday != std::numeric_limits<decltype(tm.tm_mday)>::min())
+            {
+                candidate._day = tm.tm_mday;
+                if (candidate._precision == Precision::Invalid)
+                    candidate._precision = Precision::Day;
+            }
+            if (tm.tm_mon != std::numeric_limits<decltype(tm.tm_mon)>::min())
+            {
+                candidate._month = tm.tm_mon + 1; // tm.tm_mon is [0, 11]
+                if (candidate._precision == Precision::Invalid)
+                    candidate._precision = Precision::Month;
+            }
+            if (tm.tm_year != std::numeric_limits<decltype(tm.tm_year)>::min())
+            {
+                candidate._year = tm.tm_year + 1900; // tm.tm_year is years since 1900
+                if (candidate._precision == Precision::Invalid)
+                    candidate._precision = Precision::Year;
+            }
+
+            if (candidate > res)
+                res = candidate;
+
+            if (res._precision == Precision::Sec)
+                break;
+        }
+
+        return res;
+    }
+
+    std::string PartialDateTime::toISO8601String() const
+    {
+        if (_precision == Precision::Invalid)
+            return "";
+
+        std::ostringstream ss;
+
+        ss << std::setfill('0') << std::setw(4) << _year;
+        if (_precision >= Precision::Month)
+            ss << "-" << std::setw(2) << static_cast<int>(_month);
+        if (_precision >= Precision::Day)
+            ss << "-" << std::setw(2) << static_cast<int>(_day);
+        if (_precision >= Precision::Hour)
+            ss << 'T' << std::setw(2) << static_cast<int>(_hour);
+        if (_precision >= Precision::Min)
+            ss << ':' << std::setw(2) << static_cast<int>(_min);
+        if (_precision >= Precision::Sec)
+            ss << ':' << std::setw(2) << static_cast<int>(_sec);
+
+        return ss.str();
+    }
+} // namespace lms::core