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filename_pattern.py
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from datetime import datetime as dt,timedelta
from dateutil.relativedelta import relativedelta
import re
import time
class DatedFile:
'''
File object with date information
'''
def __init__(self,filename,pattern,dayshift='0',report_range='mon-sun'):
self.pattern = pattern
self.filename = filename
self.dayshift = dayshift
self.report_range = report_range
file_date = self.date_transformer(pattern,filename)
self.file_date = self.dayshifting(file_date,dayshift,report_range)
def regex_transformer(self,pattern):
'''
:param pattern: str, The input pattern from setup page
:return: list, A pure regex pattern (str) and date groups in a list
'''
# Removing groups
pattern = pattern.replace(r'\(', r'__bracketOPEN')
pattern = pattern.replace(r'\)', r'bracketCLOSE__')
pattern = pattern.replace(r'(', '')
pattern = pattern.replace(r')', '')
pattern = pattern.replace(r'__bracketOPEN',r'\(')
pattern = pattern.replace(r'bracketCLOSE__',r'\)')
# Replace datetime codes with regex groups
date_code_dict = {'%W': '(\d{1,2})',
'%Y': '(\d{4})',
'%y': '(\d{2})',
'%m': '(\d{1,2})',
'%d': '(\d{1,2})',
'%b': '([A-Za-z]{3})',
'%B': '([A-Za-z]{3,9})',
'%j': '(\d{1,3})',
'%%': '(%)'}
err_msg = 'Warning: Invalid pattern, datetime code not identified.'
new_pattern = ''
last_char = ''
date_info = []
keys = list(date_code_dict.keys())
valid_date_char = list(map(lambda x: x[1],keys))
for char in pattern:
if char!='%' and last_char!='%':
new_pattern += char
last_char = char
elif char=='%' and last_char!='%':
last_char = char
elif char!='%' and last_char=='%':
if char in valid_date_char:
new_pattern += date_code_dict[last_char+char]
date_info.append(last_char + char)
last_char = char
else:
new_pattern = err_msg
break
elif char=='%' and last_char=='%':
new_pattern += char
last_char = ''
return new_pattern, date_info
def date_transformer(self,pattern,filename):
'''
:return: file_date (datetime object if valid, otherwise str)
'''
regex_pattern, date_code = self.regex_transformer(pattern)
regex = re.compile(regex_pattern)
matches = regex.match(filename)
if matches:
file_date_info = list(matches.groups())
if len(date_code)==0:
file_date = dt.strptime('1970-01-01', '%Y-%m-%d')
elif ('%Y' not in date_code) and ('%y' not in date_code):
date_code.append('%Y')
file_date_info.append(dt.today().strftime('%Y'))
file_date = self.pattern_sorting(date_code,file_date_info)
if (file_date - dt.today()).days > 100:
year = str(int(file_date.strftime('%Y')) - 1)
date_code.append('%Y')
file_date_info.append(year)
file_date = self.pattern_sorting(date_code,file_date_info)
elif ('%Y' in date_code) or ('%y' in date_code):
file_date = self.pattern_sorting(date_code,file_date_info)
else:
file_date = 'Filename/pattern not matching'
return file_date
def pattern_sorting(self,date_code_,file_date_info_):
date_code = date_code_
file_date_info = file_date_info_
month_sym = ['%m', '%b', '%B']
day_sym = ['%d']
if ('%W' in date_code):
if (len(month_sym + date_code) > len(list(set(month_sym + date_code)))) \
and (len(day_sym + date_code) > len(list(set(day_sym + date_code)))):
file_date = dt.strptime('-'.join(file_date_info), '-'.join(date_code))
else:
iso_var = 6
date_dict = dict(zip(date_code,file_date_info))
if '%Y' in date_dict.keys():
first_day = dt.strptime(date_dict['%Y']+'0101','%Y%m%d')
if first_day.weekday() <= 3:
iso_var = 13
else:
first_day = dt.strptime(date_dict['%y'] + '0101', '%y%m%d')
if first_day.weekday() <= 3:
iso_var = 13
date_code.append('%w')
file_date_info.append('0')
file_date = dt.strptime('-'.join(file_date_info), '-'.join(date_code)) - timedelta(
days=iso_var)
elif (len(month_sym + date_code) > len(list(set(month_sym + date_code)))) \
and (len(day_sym + date_code) == len(list(set(day_sym + date_code)))):
date_code.append('%d')
file_date_info.append('01')
file_date = dt.strptime('-'.join(file_date_info), '-'.join(date_code))
else:
if len(date_code) not in [0, 1]:
file_date = dt.strptime('-'.join(file_date_info), '-'.join(date_code))
else:
file_date = dt.strptime('1970-01-01', '%Y-%m-%d')
return file_date
def dayshifting(self,date,dayshift,report_range):
file_date = date
def date_back(wday,date):
file_date = date
if isinstance(file_date,str):
return file_date
else:
while file_date.weekday()!=wday:
file_date = file_date - timedelta(days=1)
return file_date
special_shift = dict(month_end=lambda date: date+relativedelta(months=1,days=-1),
sun=lambda date: date_back(6,date),
sat=lambda date: date_back(5,date),
fri=lambda date: date_back(4,date),
thu=lambda date: date_back(3,date),
wed=lambda date: date_back(2,date),
tue=lambda date: date_back(1,date),
mon=lambda date: date_back(0,date))
if (file_date != dt.strptime('1970-01-01','%Y-%m-%d')) and (file_date!='Filename/pattern not matching'):
if dayshift[0]=='-':
file_date = file_date - timedelta(days=int(dayshift[1:]))
elif dayshift[0]=='+':
file_date = file_date + timedelta(days=int(dayshift[1:]))
elif dayshift in special_shift:
file_date = special_shift[dayshift](file_date)
elif dayshift[:12]=='business_day':
try:
start,end = report_range.split('-',maxsplit=1)
except:
start,end = ('mon','sun')
week_days = ['mon','tue','wed','thu','fri','sat','sun']
week_days_dict = {value:key for key, value in dict(enumerate(week_days)).items()}
start = week_days_dict[start]
end = week_days_dict[end]
rge = []
cont = True
while cont:
if start>=7:
start-=7
rge.append(start)
if start==end:
cont = False
start+=1
if start>end:
end+=7
if len(dayshift)>12:
if dayshift[12]=='+':
shift = int(dayshift[13:])
elif dayshift[12]=='-':
shift = int(dayshift[13:])
else:
shift = 0
else:
shift = 0
count = 0
while count!=shift:
if dayshift[12] == '-':
file_date = file_date - timedelta(days=1)
else:
file_date = file_date + timedelta(days=1)
if file_date.weekday() in rge:
count+=1
return file_date
def str_date(self,pattern,file_date='default'):
if file_date == 'default':
file_date = self.file_date
if ('%W' in pattern):
week = str(int(self.file_date.strftime('%W')))
if len(week)==1:
week = '0'+week
if week=='00':
week = '53'
temp_pattern = pattern.replace('%%','__sign__escape__')
temp_pattern = temp_pattern.replace('%W','$-----------$')
temp_pattern = temp_pattern.replace('__sign__escape__','%%')
str_filedate = file_date.strftime(temp_pattern)
str_filedate = str_filedate.replace('$-----------$',week)
else:
str_filedate = file_date.strftime(pattern)
return str_filedate
def output_matching(self,filename,pattern):
outdate = self.date_transformer(pattern,filename)
status = self.str_date(pattern,outdate)==self.str_date(pattern)
return status