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import spacy
import re
from datetime import datetime
# load the spacy model
spacy.cli.download("en_core_web_lg")
nlp = spacy.load("en_core_web_lg")
# Define a function to extract dates from text
def extract_dates(text):
"""
Identify dates both in numeric and free-text from text, using date regex patterns and NER tag
"""
# Define regex patterns for common date formats
# Regular expressions that include the \b word boundary character to ensure that the date pattern only matches if it is not part of a longer pattern that has already been matched
date_patterns = [
r'\b\d{1,2}[-/]\d{1,2}[-/]\d{2,4}\b', # Matches dates like "01/01/22" or "1-1-2022"
r'\b\d{1,2}[-/]\d{1,2}\b(?!\d)', # Matches dates like "01/01" or "1-1"
r'\b[A-Z][a-z]{2,8} \d{1,2},? \d{2,4}\b', # Matches dates like "January 1, 2022" or "Feb 28, 22"
r'\b\d{1,2} [A-Z][a-z]{2,8} \d{2,4}\b', # Matches dates like "1 January 2022" or "28 Feb 22"
r'\b[A-Z][a-z]{2,8} \d{2,4}\b', # Matches dates like "January 2022" or "Feb 22"
]
# Find all matches for date patterns in the text
matches = []
for pattern in date_patterns:
for match in re.findall(pattern, text):
# Check if the match is part of a longer date pattern that has already been matched
if all(match not in m for m in matches):
matches.append(match)
# Use SpaCy to extract additional dates
doc = nlp(text)
for ent in doc.ents:
if ent.label_ == 'DATE':
date_str = ent.text
# Checks each SpaCy date reference against the matches list to ensure that it is not already included
if all(date_str not in m for m in matches):
matches.append(date_str)
# Remove duplicates and return the matches
return list(set(matches))
def convert_dates(date_list):
"""
Assign to the identified formatted dates the proper date format and then, on the formatted dates, assign the relevant date tags (e.g. specify which is the day, the month, etc)
"""
DATE_FORMATS = {
'%B %d, %Y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%-m-%d-%Y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%m-%d-%y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%d/%m': 'day:{dt.day}, month:{dt.month}',
'%B %d': 'day:{dt.day}, month:{dt.month}',
'%b %d': 'day:{dt.day}, month:{dt.month}',
'%B %Y': 'month:{dt.month}, year:{dt.year}',
'%Y': 'year:{dt.year}',
'%d/%m/%y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%B %d, %y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%b %d, %y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%d-%m-%Y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%d/%m/%Y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%d-%m-%y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%m/%d/%y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%m/%d/%Y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%m-%d-%Y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%m-%d-%y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%d/%m/%Y %H:%M:%S': 'day:{dt.day}, month:{dt.month}, year:{dt.year}, time:{dt.strftime("%H:%M:%S")}',
'%d/%m/%y %H:%M:%S': 'day:{dt.day}, month:{dt.month}, year:{dt.year}, time:{dt.strftime("%H:%M:%S")}',
'%m/%d/%Y %H:%M:%S': 'day:{dt.day}, month:{dt.month}, year:{dt.year}, time:{dt.strftime("%H:%M:%S")}',
'%m/%d/%y %H:%M:%S': 'day:{dt.day}, month:{dt.month}, year:{dt.year}, time:{dt.strftime("%H:%M:%S")}',
'%Y-%m-%d': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%y-%m-%d': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%m-%d-%Y %H:%M:%S': 'day:{dt.day}, month:{dt.month}, year:{dt.year}, time:{dt.strftime("%H:%M:%S")}',
'%m-%d-%y %H:%M:%S': 'day:{dt.day}, month:{dt.month}, year:{dt.year}, time:{dt.strftime("%H:%M:%S")}',
'%m-%d': 'month:{dt.month}, day:{dt.day}',
'%-m-%-d': 'month:{dt.month}, day:{dt.day}',
'%d %b %y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%d %B %Y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%b %Y': 'month:{dt.month}, year:{dt.year}',
'%b %d, %Y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}',
'%d %B %y': 'day:{dt.day}, month:{dt.month}, year:{dt.year}'
}
output_list = []
for date_str in date_list:
valid_format = False
for fmt, out_fmt in DATE_FORMATS.items():
try:
dt = datetime.strptime(date_str, fmt)
output_list.append(out_fmt.format(dt=dt))
valid_format = True
break
except ValueError:
pass
if not valid_format:
# Attempt to parse using a custom format
try:
if '-' in date_str:
dt = datetime.strptime(date_str, '%m-%d-%y')
else:
dt = datetime.strptime(date_str, '%d/%m/%y')
output_list.append(f'day:{dt.day}, month:{dt.month}, year:{dt.year}')
except ValueError:
output_list.append(f'INVALID FORMAT: {date_str}')
return output_list
def dates_binding(text):
'''
This is a function that binds together all the subcomponents of the dates identification, while also controlling for multiple, or zero date references
'''
try:
# capture the referred dates
identified_dates = extract_dates(text)
# we only accept for one date reference
if len(identified_dates) == 1:
formatted_dates = convert_dates(identified_dates)
# in case there is a wrong date format then return the appropriate code to prompt back the proper message
if 'INVALID FORMAT' in formatted_dates[0]:
return (0,'DATES','wrong_date_format')
else:
return formatted_dates
# in case of zero references return the appropriate code (to aid returning the correct prompt)
elif len(identified_dates) == 0:
return (0,'DATES','no_date')
# in case of more than one references return the appropriate code (to aid returning the correct prompt)
elif len(identified_dates) > 1:
return (0,'DATES','more_dates')
# in case of unexpected error return the appropriate code (to aid returning the correct prompt)
else:
return (0,'DATES','unknown_error')
except:
return (0,'DATES','unknown_error') |