migration: establish exact preserved app baseline

vendor/lunar_python/SolarHalfYear.py

@@ -0,0 +1,66 @@
+# -*- coding: utf-8 -*-
+from math import ceil
+
+from . import SolarMonth
+
+
+class SolarHalfYear:
+    """
+    阳历半年
+    """
+
+    MONTH_COUNT = 6
+
+    def __init__(self, year, month):
+        self.__year = year
+        self.__month = month
+
+    @staticmethod
+    def fromDate(date):
+        return SolarHalfYear(date.year, date.month)
+
+    @staticmethod
+    def fromYm(year, month):
+        return SolarHalfYear(year, month)
+
+    def getYear(self):
+        return self.__year
+
+    def getMonth(self):
+        return self.__month
+
+    def toString(self):
+        return "%d.%d" % (self.__year, self.getIndex())
+
+    def toFullString(self):
+        return "%d年%s半年" % (self.__year, ("上" if 1 == self.getIndex() else "下"))
+
+    def __str__(self):
+        return self.toString()
+
+    def getIndex(self):
+        """
+        获取当月是第几半年
+        :return: 半年序号，从1开始
+        """
+        return int(ceil(self.__month * 1.0 / SolarHalfYear.MONTH_COUNT))
+
+    def getMonths(self):
+        """
+        获取本半年的阳历月列表
+        :return: 阳历月列表
+        """
+        months = []
+        index = self.getIndex() - 1
+        for i in range(0, SolarHalfYear.MONTH_COUNT):
+            months.append(SolarMonth.fromYm(self.__year, SolarHalfYear.MONTH_COUNT * index + i + 1))
+        return months
+
+    def next(self, half_years):
+        """
+        半年推移
+        :param half_years: 推移的半年数，负数为倒推
+        :return: 推移后的半年
+        """
+        m = SolarMonth.fromYm(self.__year, self.__month).next(SolarHalfYear.MONTH_COUNT * half_years)
+        return SolarHalfYear.fromYm(m.getYear(), m.getMonth())