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formatter.py
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from __future__ import print_function
from __future__ import unicode_literals
import re
import timex
import datetime
import utilities
from dateutil import parser
from collections import Counter
def format_content(raw_content):
"""
Function to process a given news story for further formatting. Calls
a function that extract the story text minus the date and source line. Also
splits the sentences using the ``sentence_segmenter()`` function.
Parameters
----------
raw_content: String.
Content of a news story as pulled from the web scraping
database.
Returns
-------
sent_list: List.
List of sentences.
"""
content = _get_story(raw_content)
split = utilities.sentence_segmenter(content)
return split
def _get_story(story_all):
"""
Function to extract story text without date and source line.
Parameters
----------
story_all: String.
Content of a news story as pulled from the web scraping
database.
Returns
-------
story: String.
Content of story with header/frontmatter removed.
"""
if '(Reuters)' in story_all:
story = story_all[story_all.find('(Reuters)') + 12:]
elif '(IANS)' in story_all:
story = story_all[story_all.find('(IANS)') + 7:]
elif '(ANI)' in story_all:
story = story_all[story_all.find('(ANI)') + 7:]
elif '(Xinhua) -- ' in story_all:
story = story_all[story_all.find('(Xinhua) -- ') + 12:]
elif '(UPI) -- ' in story_all:
story = story_all[story_all.find('(UPI) -- ') + 9:]
if bool(re.search("\xe2\x80\x93", story_all[0:32])):
try:
story = story_all.split("\xe2\x80\x93 ", 1)[1]
except IndexError:
story = story_all
else:
story = story_all
return story
def get_date(message, process_date):
"""
Function to extract date from a story. First checks for a date from the RSS
feed itself. Then tries to pull a date from the first two sentences of a
story. Finally turns to the date that the story was added to the database.
For the dates pulled from the story, the function checks whether the
difference is greater than one day from the date that the pipeline is
parsing.
Parameters
----------
message: Dictionary.
Record of a single result from the web scraper.
process_date: datetime object.
Datetime object indicating which date the pipeline is
processing. Standard is date_running - 1 day.
Returns
-------
date : String.
Date string in the form YYMMDD.
"""
date_obj = ''
if message['date']:
try:
date_obj = parser.parse(message['date'])
except TypeError:
date_obj = ''
else:
date_obj = ''
if not date_obj:
tagged = timex.tag(message['cleaned_text'][:2])
dates = re.findall(r'<TIMEX2>(.*?)</TIMEX2>', tagged)
if dates:
try:
date_obj = parser.parse(dates[0])
diff_check = _check_date(date_obj, process_date)
if diff_check:
date_obj = ''
except TypeError:
date_obj = ''
else:
date_obj = ''
if not date_obj:
date_obj = message['date']
date = '{}{:02d}{:02d}'.format(str(date_obj.year)[2:], date_obj.month,
date_obj.day)
return date
def _check_date(date_object, process_date):
"""
Function to check the gap between the parsed date and the actual date that
the pipeline is processing.
Parameters
----------
date_object: datetime object.
Date that the _get_date function suggests as a candidate
date.
process_date: datetime object.
Datetime object indicating which date the pipeline is
processing. Standard is date_running - 1 day.
Returns
-------
too_big: Boolean.
Whether the gap is one day or larger.
"""
diff = date_object - process_date
too_big = diff > datetime.timedelta(days=0)
return too_big
def main(message, process_date):
"""
Main function to parse results from the web scraper to TABARI-formatted
output.
Parameters
----------
message: Dictionary.
Message from the scraper queue.
process_date: String.
Date for which the pipeline is running. Usually
current_date - 1.
Returns
-------
message: Dictionary.
Message dictionary with content formatted.
"""
content = message['cleaned_text']
formatted_content = format_content(content)
message['sent_list'] = [sent for sent in formatted_content if sent[0] != '"']
try:
message['date'] = get_date(message, process_date)
except ValueError:
now = datetime.datetime.utcnow()
date = '{}{:02d}{:02d}'.format(str(now.year)[2:],
now.month, now.day)
message['date'] = date
return message