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Teach DateParser about calendar quarter dates

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The calendar year can be divided into four quarters, often abbreviated
as Q1, Q2, Q3, and Q4. Q1 is 1 January to 31 March, Q2 1 April to
30 June, Q3 is 1 July to 30 September and Q4 is 1 October to 31 December

This commit teaches DateParser to parse quarter dates and represet them
as a date range. An example quarter date is "Q2 2020" which is converted
to "between 1 April 2020 and 30 June 2020". This is a one way conversion
This commit is contained in:
Steve Youngs 2020-05-11 20:57:04 +01:00 committed by Nick Hall
parent 47b57d5b59
commit 76ee061b25
1 changed files with 31 additions and 0 deletions
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31
gramps/gen/datehandler/_dateparser.py
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@ -4,6 +4,7 @@
#
# Copyright (C) 2004-2006 Donald N. Allingham
# Copyright (C) 2017 Paul Franklin
# Copyright (c) 2020 Steve Youngs
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
@ -445,6 +446,9 @@ class DateParser:
self._range = re.compile(
r"(bet|bet.|between)\s+(?P<start>.+)\s+and\s+(?P<stop>.+)",
re.IGNORECASE)
self._quarter = re.compile(
r"[qQ](?P<quarter>[1-4])\s+(?P<year>.+)",
re.IGNORECASE)
self._modifier = re.compile(r'%s\s+(.*)' % self._mod_str,
re.IGNORECASE)
self._modifier_after = re.compile(r'(.*)\s+%s' % self._mod_after_str,
@ -836,6 +840,31 @@ class DateParser:
return 1
return 0
def match_quarter(self, text, cal, ny, qual, date):
"""
Try matching calendar quarter date.
On success, set the date and return 1. On failure return 0.
"""
match = self._quarter.match(text)
if match:
quarter = self._get_int(match.group('quarter'))
text_parser = self.parser[cal]
(text, bc) = self.match_bce(match.group('year'))
start = self._parse_subdate(text, text_parser, cal)
if (start == Date.EMPTY and text != "") or (start[0] != 0) or (start[1] != 0): # reject dates where the day or month have been set
return 0
if bc:
start = self.invert_year(start)
stop_month = quarter * 3
stop_day = _max_days[stop_month - 1] # no need to worry about leap years since no quarter ends in February
date.set(qual, Date.MOD_RANGE, cal, (1, stop_month - 2, start[2], start[3]) + (stop_day, stop_month, start[2], start[3]), newyear=ny)
return 1
return 0
def match_bce(self, text):
"""
Try matching BCE qualifier.
@ -923,6 +952,8 @@ class DateParser:
return
if self.match_range(text, cal, newyear, qual, date):
return
if self.match_quarter(text, cal, newyear, qual, date):
return
(text, bc) = self.match_bce(text)
if self.match_modifier(text, cal, newyear, qual, bc, date):