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time_parser.py
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from datetime import datetime, timedelta
relative_days = {'yesterday':-1, 'today':0, 'tomorrow':1}
relative_days.update({k[:3]:v for k,v in relative_days.items()})
weekday_map = {v:i for i,v in enumerate(['monday','tuesday','wednesday','thursday','friday','saturday','sunday'])}
weekday_map.update({k[:3]:k for k in weekday_map})
adverb_map = {'last':-1,'this':0,'next':1}
def parse_datetime(date_str):
now = datetime.now()
if not date_str:
return now
parameters = {}
modifier = 0
date_str = date_str.lower()
for expr in filter(bool, date_str.split(' ')):
if expr in adverb_map:
modifier = adverb_map[expr]
continue
elif '.' in expr:
if expr.endswith('.'): # allow writing like: 31.01. as well as 31.01
expr = expr[:-1]
expr = expr.split('.')
assert len(expr) <= 3
if len(expr) >= 1:
parameters['day'] = int(expr[0])
if len(expr) >= 2:
parameters['month'] = int(expr[1])
if len(expr) == 3:
parameters['year'] = int(expr[2])
elif ':' in expr:
if expr.endswith(':'): # allow writing like: 12:32 as well as 32:
expr = expr[:-1]
expr = expr.split(':')
assert len(expr) <= 3
if len(expr) >= 1:
parameters['hour'] = int(expr[0])
if len(expr) >= 2:
parameters['minute'] = int(expr[1])
if len(expr) == 3:
parameters['second'] = int(expr[2])
else:
if expr in weekday_map:
dt = next_weekday(modifier, expr)
elif expr in relative_days:
delta = relative_days[expr]
dt = (now + timedelta(days=delta))
else:
try:
delta = int(expr)
dt = (now + timedelta(days=delta))
except ValueError:
pass
if 'dt' not in locals():
raise ParsingError('Cannot interprete ´' + str(date_str) + '´ (especially: ´' + str(expr) + '´, type: ' + str(type(expr)) + ') as a date.')
parameters['day'] = dt.day
parameters['month'] = dt.month
parameters['year'] = dt.year
del dt
if 'year' not in parameters:
parameters['year'] = now.year
if 'month' not in parameters:
parameters['month'] = now.month
if 'day' not in parameters:
parameters['day'] = now.day
# year correction to current century
if 0 <= parameters['year'] < 100:
parameters['year'] = (now.year // 100) * 100 + parameters['year']
#
return datetime(**parameters)
class ParsingError(ValueError):
pass
def next_weekday(d, weekday):
if isinstance(weekday, str):
weekday = weekday_map[weekday]
if isinstance(d, int):
d = datetime.now() - timedelta(days=d*7)
days_ahead = weekday - d.weekday()
if days_ahead <= 0: # Target day already happened this week
days_ahead += 7
return d + timedelta(days_ahead)
if __name__ == '__main__':
for test_str in ['1.','2','12.3.13','12.4 12:12', '12:', 'next friday', 'this monday', 'tom']:
print(test_str, ':', parse_datetime(test_str))
#------------------------------------------
"""
from pyparsing import Word, nums, CaselessKeyword as CKWord
from functools import reduce
from operator import xor
class TimeParser:
def __init__(self):
date = Word(nums) + ':' + Word(nums) + ':' + Word(nums)
date = date.setResultsName('date')
weekdays = ['monday','tuesday','wednesday','thursday','friday','saturday','sunday']
weekday = reduce(xor, [CKWord(w) for w in weekdays])
weekday = weekday.setResultsName('weekday')
adverbs = ['next','last','this']
adverb = reduce(xor, [CKWord(a) for a in adverbs])
adverb = adverb.setResultsName('adverb')
relative_days = ['today','tomorrow','yesterday']
rela_day = reduce(xor, [CKWord(rd) for rd in relative_days])
rela_day = rela_day.setResultsName('relative_day')
day = (adverb + weekday) ^ (weekday) ^ (date) ^ (rela_day)
day = day.setResultsName('day')
self.date_expr = day
def parse_date(self, date_str):
return self.date_expr.parseString(date_str)
tp = TimeParser()
date = tp.parse_date('this monday')
print(repr(date))"""