support o'clock - fixes #12 (second half)

tests/test_e2e.py

@@ -79,7 +79,7 @@ def test_default(now, test_input, expected):
 @pytest.mark.parametrize("test_input, expected", [
     # time only
     ('5p', datetime.time(hour=17, minute=0)),
-    # ("3 o'clock", datetime.time(hour=3, minute=0)),
+    ("3 o'clock pm", datetime.time(hour=15, minute=0)), # fixes gh#12
     
     # date only
     ('July 2019', datetime.date(2019, 7, 1)),
@@ -112,7 +112,6 @@ def test_default(now, test_input, expected):
     ('30-40 mins', (datetime.timedelta(minutes=30), datetime.timedelta(minutes=40))),
     ('1 or 2 days', [datetime.timedelta(days=1), datetime.timedelta(days=2)]),
 
-    # TODO: support "3 o'clock"
     # TODO: support "quarter to 3"
     # TODO: support "one and a half hours"
     

timefhuman/grammar.lark

@@ -77,7 +77,7 @@ date: month "/" day "/" year
 // However, that means to support single-integer (e.g., hour) times, we need
 // to manually add them to the `datetime` rule above.
 time: hour ":" minute meridiem?
-    | hour meridiem
+    | hour ("o'clock")? meridiem
     | timename
 
 duration: ("in"|"for")? duration_part (("and"|",")? duration_part)* ("ago")?