Handle -Sun notation

This fixes #119.

Author: kiorky

src/croniter/croniter.py

@@ -507,8 +507,12 @@ def expand(cls, expr_format):
                         not low or not high or int(low) > int(high)
                         or not only_int_re.search(str(step))
                     ):
-                        raise CroniterBadDateError(
-                            "[{0}] is not acceptable".format(expr_format))
+                        if i == 4 and high == '0':
+                            # handle -Sun notation -> 7
+                            high = '7'
+                        else:
+                            raise CroniterBadDateError(
+                                "[{0}] is not acceptable".format(expr_format))
 
                     low, high, step = map(int, [low, high, step])
                     try:

src/croniter/tests/test_croniter.py

@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 import unittest
-from datetime import datetime
+from datetime import datetime, timedelta
 from time import sleep
 import pytz
 from croniter import croniter, CroniterBadDateError, CroniterBadCronError, CroniterNotAlphaError
@@ -835,6 +835,72 @@ def test_milliseconds(self):
     def test_invalid_zerorepeat(self):
         self.assertFalse(croniter.is_valid('*/0 * * * *'))
 
+    def test_weekday_range(self):
+        ret = []
+        # jan 14 is monday
+        dt = datetime(2019, 1, 14, 0, 0, 0, 0)
+        for i in range(10):
+            c = croniter("0 0 * * 2-4 *", start_time=dt)
+            dt = datetime.utcfromtimestamp(c.get_next())
+            ret.append(dt)
+            dt += timedelta(days=1)
+        sret = ["{0}".format(r) for r in ret]
+        self.assertEquals(
+            sret,
+            ['2019-01-15 00:00:00',
+             '2019-01-16 00:00:01',
+             '2019-01-17 00:00:02',
+             '2019-01-22 00:00:00',
+             '2019-01-23 00:00:01',
+             '2019-01-24 00:00:02',
+             '2019-01-29 00:00:00',
+             '2019-01-30 00:00:01',
+             '2019-01-31 00:00:02',
+             '2019-02-05 00:00:00'])
+        ret = []
+        dt = datetime(2019, 1, 14, 0, 0, 0, 0)
+        for i in range(10):
+            c = croniter("0 0 * * 1-7 *", start_time=dt)
+            dt = datetime.utcfromtimestamp(c.get_next())
+            ret.append(dt)
+            dt += timedelta(days=1)
+        sret = ["{0}".format(r) for r in ret]
+        self.assertEquals(
+            sret,
+            ['2019-01-14 00:00:01',
+             '2019-01-15 00:00:02',
+             '2019-01-16 00:00:03',
+             '2019-01-17 00:00:04',
+             '2019-01-18 00:00:05',
+             '2019-01-19 00:00:06',
+             '2019-01-20 00:00:07',
+             '2019-01-21 00:00:08',
+             '2019-01-22 00:00:09',
+             '2019-01-23 00:00:10'])
+
+    def test_issue_monsun_117(self):
+        ret = []
+        dt = datetime(2019, 1, 14, 0, 0, 0, 0)
+        for i in range(10):
+            # c = croniter("0 0 * * Mon-Sun *", start_time=dt)
+            c = croniter("0 0 * * Wed-Sun *", start_time=dt)
+            dt = datetime.utcfromtimestamp(c.get_next())
+            ret.append(dt)
+            dt += timedelta(days=1)
+        sret = ["{0}".format(r) for r in ret]
+        self.assertEquals(
+            sret,
+            ['2019-01-16 00:00:00',
+             '2019-01-17 00:00:01',
+             '2019-01-18 00:00:02',
+             '2019-01-19 00:00:03',
+             '2019-01-20 00:00:04',
+             '2019-01-23 00:00:00',
+             '2019-01-24 00:00:01',
+             '2019-01-25 00:00:02',
+             '2019-01-26 00:00:03',
+             '2019-01-27 00:00:04'])
+
 
 if __name__ == '__main__':
     unittest.main()