Implemented the period parser.
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@ -18,6 +18,13 @@
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"""The utilities of the accounting application.
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"""
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import re
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from datetime import date
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from django.template import defaultfilters
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from django.utils import dateformat
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from django.utils.timezone import localdate, timedelta
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from django.utils.translation import pgettext, gettext
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class PeriodParser:
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@ -27,14 +34,192 @@ class PeriodParser:
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period_spec (str): The period specification.
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Attributes:
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start (str): The start of the period.
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end (str): The end of the period.
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spec (str): The period specification.
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start (date): The start of the period.
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end (date): The end of the period.
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description (str): The text description of the period.
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error (str): The period specification format error, or
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None on success.
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"""
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spec = None
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start = None
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end = None
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description = None
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error = None
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def __init__(self, period_spec):
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self.start = period_spec + "-01"
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self.end = period_spec + "-30"
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self.spec = period_spec
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# A specific month
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m = re.match("^([0-9]{4})-([0-9]{2})$", period_spec)
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if m is not None:
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try:
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year = int(m.group(1))
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month = int(m.group(2))
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self.set_month_range(year, month)
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self.description = self.get_month_description(
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year, month)
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except ValueError:
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self.invalid_period()
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return
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# From a specific month
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m = re.match("^([0-9]{4})-([0-9]{2})-$", period_spec)
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if m is not None:
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try:
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year = int(m.group(1))
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month = int(m.group(2))
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self.start = date(year, month, 1)
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self.end = self.get_month_last_day(localdate())
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self.description = gettext(
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"Since %s") % self.get_month_description(
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year, month)
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except ValueError:
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self.invalid_period()
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return
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# A specific year
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m = re.match("^([0-9]{4})$", period_spec)
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if m is not None:
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try:
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year = int(m.group(1))
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self.start = date(year, 1, 1)
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self.end = date(year, 12, 31)
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today = localdate()
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if year == today.year:
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self.description = gettext("This Year")
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elif year == today.year - 1:
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self.description = gettext("Last Year")
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else:
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self.description = str(year)
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except ValueError:
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self.invalid_period()
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return
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# All time
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if period_spec == "-":
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self.start = date(2000, 1, 1)
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self.end = self.get_month_last_day(localdate())
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self.description = gettext("All")
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return
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# A specific date
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m = re.match("^([0-9]{4})-([0-9]{2})-([0-9]{2})$",
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period_spec)
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if m is not None:
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try:
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self.start = date(
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int(m.group(1)), int(m.group(2)), int(m.group(3)))
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self.end = self.start
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today = localdate()
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if self.start == today:
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self.description = gettext("Today")
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elif self.start == today - timedelta(days=1):
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self.description = gettext("Yesterday")
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elif self.start.year != today.year:
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self.description = defaultfilters.date(
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self.start, "Y/n/j")
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else:
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self.description = defaultfilters.date(
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self.start, "n/j")
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except ValueError:
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self.invalid_period()
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return
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# A specific date period
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m = re.match(("^([0-9]{4})-([0-9]{2})-([0-9]{2})"
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"-([0-9]{4})-([0-9]{2})-([0-9]{2})$"),
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period_spec)
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if m is not None:
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try:
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self.start = date(
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int(m.group(1)), int(m.group(2)), int(m.group(3)))
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self.end = date(
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int(m.group(4)), int(m.group(5)), int(m.group(6)))
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today = localdate()
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if self.start.year != self.end.year:
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self.description = "%s-%s" % (
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defaultfilters.date(self.start, "Y/n/j"),
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defaultfilters.date(self.end, "Y/n/j"))
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elif self.start.month != self.end.month:
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if self.start.year != today.year:
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self.description = "%s-%s" % (
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defaultfilters.date(self.start, "Y/n/j"),
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defaultfilters.date(self.end, "n/j"))
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else:
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self.description = "%s-%s" % (
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defaultfilters.date(self.start, "n/j"),
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defaultfilters.date(self.end, "n/j"))
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else:
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if self.start.year != today.year:
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self.description = "%s-%s" % (
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defaultfilters.date(self.start, "Y/n/j"),
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defaultfilters.date(self.end, "j"))
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else:
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self.description = "%s-%s" % (
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defaultfilters.date(self.start, "n/j"),
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defaultfilters.date(self.end, "j"))
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except ValueError:
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self.invalid_period()
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# Wrong period format
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self.invalid_period()
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def invalid_period(self):
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"""Sets the period when the period specification is invalid.
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"""
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self.error = pgettext("Accounting|", "Invalid period.")
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today = localdate()
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self.spec = dateformat.format(localdate(), "Y-m")
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self.set_month_range(today.year, today.month)
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self.description = gettext("This Month")
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def set_month_range(self, year, month):
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"""Calculates and returns the date range of a month.
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Args:
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year (int): The year.
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month (int): The month.
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Returns:
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tuple(date): The date range of the month.
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Throws:
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ValueError: When the year and month are invalid
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"""
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self.start = date(year, month, 1)
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self.end = self.get_month_last_day(self.start)
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@staticmethod
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def get_month_last_day(day):
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"""Calculates and returns the last day of a month.
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Args:
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day (date): A day in the month.
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Returns:
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date: The last day in the month
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"""
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next_month = day.month + 1
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next_year = day.year
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if next_month > 12:
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next_month = 1
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next_year = next_year + 1
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return date(next_year, next_month, 1) - timedelta(days=1)
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@staticmethod
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def get_month_description(year, month):
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"""Returns the text description of a month.
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Args:
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year (int): The year.
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month (int): The month.
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Returns:
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str: The description of the month
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"""
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today = localdate()
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if year == today.year and month == today.month:
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return gettext("This Month")
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prev_month = today.month - 1
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prev_year = today.year
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if prev_month < 1:
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prev_month = 12
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prev_year = prev_year - 1
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prev = date(prev_year, prev_month, 1)
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if year == prev.year and month == prev.month:
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return gettext("Last Month")
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return "%d/%d" % (year, month)
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