isoparse: Fail with inconsistent time separators

changelog.d/1125.bugfix.rst

@@ -0,0 +1 @@
+Make `isoparse` raise when trying to parse times with inconsistent use of `:` separator. Reported and fixed by @mariocj89 (gh pr #1125).

dateutil/parser/isoparser.py

@@ -336,7 +336,7 @@ def _parse_isotime(self, timestr):
         if len(timestr) < 2:
             raise ValueError('ISO time too short')
 
-        has_sep = len_str >= 3 and timestr[2:3] == self._TIME_SEP
+        has_sep = False
 
         while pos < len_str and comp < 5:
             comp += 1
@@ -347,13 +347,18 @@ def _parse_isotime(self, timestr):
                 pos = len_str
                 break
 
+            if comp == 1 and timestr[pos:pos+1] == self._TIME_SEP:
+                has_sep = True
+                pos += 1
+            elif comp == 2 and has_sep:
+                if timestr[pos:pos+1] != self._TIME_SEP:
+                    raise ValueError('Inconsistent use of colon separator')
+                pos += 1
+
             if comp < 3:
                 # Hour, minute, second
                 components[comp] = int(timestr[pos:pos + 2])
                 pos += 2
-                if (has_sep and pos < len_str and
-                        timestr[pos:pos + 1] == self._TIME_SEP):
-                    pos += 1
 
             if comp == 3:
                 # Fraction of a second

dateutil/test/test_isoparser.py

@@ -244,6 +244,8 @@ def test_bytes(isostr, dt):
     ('2012-0425', ValueError),                  # Inconsistent date separators
     ('201204-25', ValueError),                  # Inconsistent date separators
     ('20120425T0120:00', ValueError),           # Inconsistent time separators
+    ('20120425T01:2000', ValueError),           # Inconsistent time separators
+    ('14:3015', ValueError),                    # Inconsistent time separator
     ('20120425T012500-334', ValueError),        # Wrong microsecond separator
     ('2001-1', ValueError),                     # YYYY-M not valid
     ('2012-04-9', ValueError),                  # YYYY-MM-D not valid
@@ -286,17 +288,6 @@ def test_iso_with_sep_raises(sep_act, valid_sep, exception):
         parser.isoparse(isostr)
 
 
-@pytest.mark.xfail() 
-@pytest.mark.parametrize('isostr,exception', [  # pragma: nocover
-    ('20120425T01:2000', ValueError),           # Inconsistent time separators
-])
-def test_iso_raises_failing(isostr, exception):
-    # These are test cases where the current implementation is too lenient
-    # and need to be fixed
-    with pytest.raises(exception):
-        isoparse(isostr)
-
-
 ###
 # Test ISOParser constructor
 @pytest.mark.parametrize('sep', ['  ', '9', '🍛'])
@@ -397,6 +388,7 @@ def test_parse_isodate(d, dt_fmt, as_bytes):
     ('2013-02-29', ValueError),                 # Not a leap year
     ('2014/12/03', ValueError),                 # Wrong separators
     ('2014-04-19T', ValueError),                # Unknown components
+    ('201202', ValueError),                     # Invalid format
 ])
 def test_isodate_raises(isostr, exception):
     with pytest.raises(exception):
@@ -503,14 +495,3 @@ def test_isotime_raises(isostr, exception):
     iparser = isoparser()
     with pytest.raises(exception):
         iparser.parse_isotime(isostr)
-
-
-@pytest.mark.xfail() 
-@pytest.mark.parametrize('isostr,exception', [  # pragma: nocover
-    ('14:3015', ValueError),                    # Inconsistent separator use
-    ('201202', ValueError)                      # Invalid ISO format
-])
-def test_isotime_raises_xfail(isostr, exception):
-    iparser = isoparser()
-    with pytest.raises(exception):
-        iparser.parse_isotime(isostr)