Raise ParserError for an interval with mismatched endpoint types - #992
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eeshsaxena wants to merge 1 commit into
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Raise ParserError for an interval with mismatched endpoint types#992eeshsaxena wants to merge 1 commit into
eeshsaxena wants to merge 1 commit into
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pendulum.parse treats 'A/B' as an ISO 8601 interval. When one side parses to a date and the other to a bare time (e.g. '2020-01-01/12:30:00'), building the interval does Time - date and raised a bare TypeError out of parse(). Same for time/time and time/date. Convert that TypeError into a ParserError so callers get the documented parse error instead.
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pendulum.parse('2020-01-01/12:30:00')raisesTypeError: unsupported operand type(s) for -: 'Time' and 'datetime.date'instead of a ParserError.The
/makesparsetreat the string as an ISO 8601 interval. Here one side parses to a date and the other to a bare time, and building the interval computesend - start(Time - date), which is undefined. The same happens fortime/time(12:00:00/13:00:00) andtime/date. Valid intervals (datetime/datetime, date/date) are unaffected.I wrapped the two-endpoint
pendulum.interval(...)construction in_parseso aTypeErrorthere is re-raised asParserError, which is whatparsealready raises for other invalid input (and it subclasses ValueError, so existingexcept ValueErrorhandlers still work).Added a test in test_parsing.py covering the mismatched cases; it raises TypeError on master and passes with the change, and the rest of the parsing tests still pass. Found it by fuzzing
parsewith mutated date strings.