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60 lines
1.5 KiB
60 lines
1.5 KiB
# Copyright (c) 2010-2022 openpyxl
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"""
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Type inference functions
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"""
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import datetime
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import re
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from openpyxl.styles import numbers
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PERCENT_REGEX = re.compile(r'^(?P<number>\-?[0-9]*\.?[0-9]*\s?)\%$')
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TIME_REGEX = re.compile(r"""
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^(?: # HH:MM and HH:MM:SS
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(?P<hour>[0-1]{0,1}[0-9]{2}):
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(?P<minute>[0-5][0-9]):?
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(?P<second>[0-5][0-9])?$)
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^(?: # MM:SS.
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([0-5][0-9]):
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([0-5][0-9])?\.
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(?P<microsecond>\d{1,6}))
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""", re.VERBOSE)
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NUMBER_REGEX = re.compile(r'^-?([\d]|[\d]+\.[\d]*|\.[\d]+|[1-9][\d]+\.?[\d]*)((E|e)[-+]?[\d]+)?$')
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def cast_numeric(value):
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"""Explicity convert a string to a numeric value"""
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if NUMBER_REGEX.match(value):
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try:
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return int(value)
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except ValueError:
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return float(value)
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def cast_percentage(value):
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"""Explicitly convert a string to numeric value and format as a
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percentage"""
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match = PERCENT_REGEX.match(value)
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if match:
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return float(match.group('number')) / 100
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def cast_time(value):
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"""Explicitly convert a string to a number and format as datetime or
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time"""
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match = TIME_REGEX.match(value)
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if match:
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if match.group("microsecond") is not None:
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value = value[:12]
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pattern = "%M:%S.%f"
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#fmt = numbers.FORMAT_DATE_TIME5
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elif match.group('second') is None:
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#fmt = numbers.FORMAT_DATE_TIME3
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pattern = "%H:%M"
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else:
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pattern = "%H:%M:%S"
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#fmt = numbers.FORMAT_DATE_TIME6
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value = datetime.datetime.strptime(value, pattern)
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return value.time()
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