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timeparse.py
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timeparse.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
timeparse.py
(c) Will Roberts <wildwilhelm@gmail.com> 1 February, 2014
Implements a single function, `timeparse`, which can parse various
kinds of time expressions.
Taken from https://github.com/wroberts/pytimeparse/blob/master/pytimeparse/timeparse.py
'''
# MIT LICENSE
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import re
SIGN = r'(?P<sign>[+|-])?'
# YEARS = r'(?P<years>\d+)\s*(?:ys?|yrs?.?|years?)'
# MONTHS = r'(?P<months>\d+)\s*(?:mos?.?|mths?.?|months?)'
WEEKS = r'(?P<weeks>[\d.]+)\s*(?:w|wks?|weeks?)'
DAYS = r'(?P<days>[\d.]+)\s*(?:d|dys?|days?)'
HOURS = r'(?P<hours>[\d.]+)\s*(?:h|hrs?|hours?)'
MINS = r'(?P<mins>[\d.]+)\s*(?:m|(mins?)|(minutes?))'
SECS = r'(?P<secs>[\d.]+)\s*(?:s|secs?|seconds?)'
SEPARATORS = r'[,/]'
SECCLOCK = r':(?P<secs>\d{2}(?:\.\d+)?)'
MINCLOCK = r'(?P<mins>\d{1,2}):(?P<secs>\d{2}(?:\.\d+)?)'
HOURCLOCK = r'(?P<hours>\d+):(?P<mins>\d{2}):(?P<secs>\d{2}(?:\.\d+)?)'
DAYCLOCK = (r'(?P<days>\d+):(?P<hours>\d{2}):'
r'(?P<mins>\d{2}):(?P<secs>\d{2}(?:\.\d+)?)')
OPT = lambda x: r'(?:{x})?'.format(x=x, SEPARATORS=SEPARATORS)
OPTSEP = lambda x: r'(?:{x}\s*(?:{SEPARATORS}\s*)?)?'.format(
x=x, SEPARATORS=SEPARATORS)
TIMEFORMATS = [
r'{WEEKS}\s*{DAYS}\s*{HOURS}\s*{MINS}\s*{SECS}'.format(
# YEARS=OPTSEP(YEARS),
# MONTHS=OPTSEP(MONTHS),
WEEKS=OPTSEP(WEEKS),
DAYS=OPTSEP(DAYS),
HOURS=OPTSEP(HOURS),
MINS=OPTSEP(MINS),
SECS=OPT(SECS)),
r'{MINCLOCK}'.format(
MINCLOCK=MINCLOCK),
r'{WEEKS}\s*{DAYS}\s*{HOURCLOCK}'.format(
WEEKS=OPTSEP(WEEKS),
DAYS=OPTSEP(DAYS),
HOURCLOCK=HOURCLOCK),
r'{DAYCLOCK}'.format(
DAYCLOCK=DAYCLOCK),
r'{SECCLOCK}'.format(
SECCLOCK=SECCLOCK),
# r'{YEARS}'.format(
# YEARS=YEARS),
# r'{MONTHS}'.format(
# MONTHS=MONTHS),
]
MULTIPLIERS = dict([
# ('years', 60 * 60 * 24 * 365),
# ('months', 60 * 60 * 24 * 30),
('weeks', 60 * 60 * 24 * 7),
('days', 60 * 60 * 24),
('hours', 60 * 60),
('mins', 60),
('secs', 1)
])
def _interpret_as_minutes(sval, mdict):
"""
Times like "1:22" are ambiguous; do they represent minutes and seconds
or hours and minutes? By default, timeparse assumes the latter. Call
this function after parsing out a dictionary to change that assumption.
>>> import pprint
>>> pprint.pprint(_interpret_as_minutes('1:24', {'secs': '24', 'mins': '1'}))
{'hours': '1', 'mins': '24'}
"""
if (sval.count(':') == 1
and '.' not in sval
and (('hours' not in mdict) or (mdict['hours'] is None))
and (('days' not in mdict) or (mdict['days'] is None))
and (('weeks' not in mdict) or (mdict['weeks'] is None))
# and (('months' not in mdict) or (mdict['months'] is None))
# and (('years' not in mdict) or (mdict['years'] is None))
):
mdict['hours'] = mdict['mins']
mdict['mins'] = mdict['secs']
mdict.pop('secs')
pass
return mdict
def timeparse(sval, granularity='seconds'):
'''
Parse a time expression, returning it as a number of seconds. If
possible, the return value will be an `int`; if this is not
possible, the return will be a `float`. Returns `None` if a time
expression cannot be parsed from the given string.
Arguments:
- `sval`: the string value to parse
>>> timeparse('1:24')
84
>>> timeparse(':22')
22
>>> timeparse('1 minute, 24 secs')
84
>>> timeparse('1m24s')
84
>>> timeparse('1.2 minutes')
72
>>> timeparse('1.2 seconds')
1.2
Time expressions can be signed.
>>> timeparse('- 1 minute')
-60
>>> timeparse('+ 1 minute')
60
If granularity is specified as ``minutes``, then ambiguous digits following
a colon will be interpreted as minutes; otherwise they are considered seconds.
>>> timeparse('1:30')
90
>>> timeparse('1:30', granularity='minutes')
5400
'''
match = re.match(r'\s*' + SIGN + r'\s*(?P<unsigned>.*)$', sval)
sign = -1 if match.groupdict()['sign'] == '-' else 1
sval = match.groupdict()['unsigned']
for timefmt in TIMEFORMATS:
match = re.match(r'\s*' + timefmt + r'\s*$', sval, re.I)
if match and match.group(0).strip():
mdict = match.groupdict()
if granularity == 'minutes':
mdict = _interpret_as_minutes(sval, mdict)
# if all of the fields are integer numbers
if all(v.isdigit() for v in list(mdict.values()) if v):
return sign * sum([MULTIPLIERS[k] * int(v, 10) for (k, v) in
list(mdict.items()) if v is not None])
# if SECS is an integer number
elif ('secs' not in mdict or
mdict['secs'] is None or
mdict['secs'].isdigit()):
# we will return an integer
return (
sign * int(sum([MULTIPLIERS[k] * float(v) for (k, v) in
list(mdict.items()) if k != 'secs' and v is not None])) +
(int(mdict['secs'], 10) if mdict['secs'] else 0))
else:
# SECS is a float, we will return a float
return sign * sum([MULTIPLIERS[k] * float(v) for (k, v) in
list(mdict.items()) if v is not None])