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Added fallback time extraction engine #135

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merged 11 commits into from
Nov 8, 2020
Merged

Added fallback time extraction engine #135

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15c3c64
Added fallback time extraction engine
TheMulti0 Nov 5, 2020
b04c5ac
Return none without an exception failure in extract_time
TheMulti0 Nov 5, 2020
72373ef
Integrated more comprehensive datetime regex
TheMulti0 Nov 6, 2020
6b12045
Update facebook_scraper/extractors.py
TheMulti0 Nov 7, 2020
ed936cf
Added day digit to month regex
TheMulti0 Nov 7, 2020
c67238a
Disable date parsing catch (caught in extract_post)
TheMulti0 Nov 7, 2020
f866e37
time -> datetime
TheMulti0 Nov 7, 2020
0a72f3a
Merge remote-tracking branch 'origin/master'
TheMulti0 Nov 7, 2020
2b6e7c1
Update facebook_scraper/utils.py
TheMulti0 Nov 8, 2020
a252065
Month capture is optional
TheMulti0 Nov 8, 2020
35e6eac
Date and period capture are optional
TheMulti0 Nov 8, 2020
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9 changes: 9 additions & 0 deletions facebook_scraper/extractors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -203,6 +203,15 @@ def extract_time(self) -> PartialPost:
except (KeyError, ValueError):
continue

try:
date = utils.parse_date(element_full_text=self.element.full_text)
if date:
return {
'time': date
}
except:
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return None

return None

def extract_user_id(self) -> PartialPost:
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35 changes: 35 additions & 0 deletions facebook_scraper/utils.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,10 @@
import codecs
import re
from datetime import datetime
from typing import Optional
from urllib.parse import parse_qsl, unquote, urlencode, urljoin, urlparse, urlunparse

import dateparser
from html2text import html2text as _html2text
from requests_html import DEFAULT_URL, Element, PyQuery

Expand Down Expand Up @@ -43,3 +46,35 @@ def make_html_element(html: str, url=DEFAULT_URL) -> Element:

def html2text(html: str) -> str:
return _html2text(html)


date = r"Jan(?:uary)?|" \
r"Feb(?:ruary)?|" \
r"Mar(?:ch)?|" \
r"Apr(?:il)?|" \
r"May|" \
r"Jun(?:e)?|" \
r"Jul(?:y)?|" \
r"Aug(?:ust)?|" \
r"Sep(?:tember)?|" \
r"Oct(?:ober)?|" \
r"Nov(?:ember)?|" \
r"Dec(?:ember)?|" \
r"Yesterday|" \
r"Today"
hour = r"\d{1,2}"
minute = r"\d{2}"
period = r"AM|PM"
exact_time = fr"({date}) at {hour}:{minute} ({period})"
relative_time = r"\d{1,2} \w+"
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@kevinzg kevinzg Nov 8, 2020 •
edited
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This seems a bit vague since it is being matched with the text from the whole post and not just a date.
For example, with the previous date April 3, 2018 at 8:02 PM, it was matching with 18 at and returning 2020-11-18 00:00.
What exactly is this trying to match?

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According to a previous comment it could be 16 hrs or 16h so maybe:

Suggested change
relative_time = r"\d{1,2} \w+"
relative_time = r"\b\d{1,2}(?:h| hrs)"

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The only date I found is in the entire post text, and I only saw dates that have explicit month and day of month specification and a time, days that have 'Today' or 'Yesterday' and a time, and just relative time dates (16 hours ago, hours is the only case I found)

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@kevinzg kevinzg Nov 9, 2020 •
edited
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The only date I found is in the entire post text

I guess this is a reply to my suggestion of using self.element.find('abbr', first=True). If there are cases where the date is not inside that tag, then it could fallback to look in the entire text.


time_regex = re.compile(fr"({exact_time}|{relative_time})")


def parse_date(element_full_text: str) -> Optional[datetime]:
time_match = time_regex.search(element_full_text)
if time_match:
time = time_match.group(0)
return dateparser.parse(time)
else:
return None
1 change: 1 addition & 0 deletions requirements-dev.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -223,3 +223,4 @@ yarl==1.4.2; python_version >= "3.6" \
zipp==3.1.0; python_version < "3.8" \
--hash=sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b \
--hash=sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96
dateparser~=1.0.0
4 changes: 4 additions & 0 deletions requirements.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -92,3 +92,7 @@ websockets==8.0.2 \
--hash=sha256:f5cb2683367e32da6a256b60929a3af9c29c212b5091cf5bace9358d03011bf5 \
--hash=sha256:049e694abe33f8a1d99969fee7bfc0ae6761f7fd5f297c58ea933b27dd6805f2 \
--hash=sha256:882a7266fa867a2ebb2c0baaa0f9159cabf131cf18c1b4270d79ad42f9208dc5

html2text~=2020.1.16
requests~=2.24.0
dateparser~=1.0.0
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