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e11b510a5b
module. The code is shorter, more readable, faster, and dramatically increases the range of acceptable dates. Also, used the floor division operator in leapdays().
221 lines
7.2 KiB
Python
221 lines
7.2 KiB
Python
"""Calendar printing functions
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Note when comparing these calendars to the ones printed by cal(1): By
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default, these calendars have Monday as the first day of the week, and
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Sunday as the last (the European convention). Use setfirstweekday() to
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set the first day of the week (0=Monday, 6=Sunday)."""
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import datetime
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__all__ = ["error","setfirstweekday","firstweekday","isleap",
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"leapdays","weekday","monthrange","monthcalendar",
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"prmonth","month","prcal","calendar","timegm",
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"month_name", "month_abbr", "day_name", "day_abbr"]
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# Exception raised for bad input (with string parameter for details)
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error = ValueError
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# Constants for months referenced later
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January = 1
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February = 2
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# Number of days per month (except for February in leap years)
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mdays = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
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# This module used to have hard-coded lists of day and month names, as
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# English strings. The classes following emulate a read-only version of
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# that, but supply localized names. Note that the values are computed
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# fresh on each call, in case the user changes locale between calls.
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class _localized_month:
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def __init__(self, format):
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self.format = format
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def __getitem__(self, i):
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data = [datetime.date(2001, j, 1).strftime(self.format)
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for j in range(1, 13)]
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data.insert(0, "")
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return data[i]
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def __len__(self):
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return 13
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class _localized_day:
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def __init__(self, format):
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self.format = format
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def __getitem__(self, i):
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# January 1, 2001, was a Monday.
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data = [datetime.date(2001, 1, j+1).strftime(self.format)
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for j in range(7)]
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return data[i]
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def __len__(self_):
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return 7
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# Full and abbreviated names of weekdays
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day_name = _localized_day('%A')
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day_abbr = _localized_day('%a')
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# Full and abbreviated names of months (1-based arrays!!!)
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month_name = _localized_month('%B')
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month_abbr = _localized_month('%b')
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# Constants for weekdays
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(MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY) = range(7)
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_firstweekday = 0 # 0 = Monday, 6 = Sunday
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def firstweekday():
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return _firstweekday
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def setfirstweekday(weekday):
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"""Set weekday (Monday=0, Sunday=6) to start each week."""
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global _firstweekday
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if not MONDAY <= weekday <= SUNDAY:
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raise ValueError, \
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'bad weekday number; must be 0 (Monday) to 6 (Sunday)'
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_firstweekday = weekday
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def isleap(year):
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"""Return 1 for leap years, 0 for non-leap years."""
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return year % 4 == 0 and (year % 100 != 0 or year % 400 == 0)
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def leapdays(y1, y2):
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"""Return number of leap years in range [y1, y2).
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Assume y1 <= y2."""
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y1 -= 1
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y2 -= 1
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return (y2//4 - y1//4) - (y2//100 - y1//100) + (y2//400 - y1//400)
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def weekday(year, month, day):
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"""Return weekday (0-6 ~ Mon-Sun) for year (1970-...), month (1-12),
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day (1-31)."""
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return datetime.date(year, month, day).weekday()
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def monthrange(year, month):
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"""Return weekday (0-6 ~ Mon-Sun) and number of days (28-31) for
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year, month."""
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if not 1 <= month <= 12:
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raise ValueError, 'bad month number'
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day1 = weekday(year, month, 1)
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ndays = mdays[month] + (month == February and isleap(year))
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return day1, ndays
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def monthcalendar(year, month):
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"""Return a matrix representing a month's calendar.
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Each row represents a week; days outside this month are zero."""
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day1, ndays = monthrange(year, month)
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rows = []
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r7 = range(7)
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day = (_firstweekday - day1 + 6) % 7 - 5 # for leading 0's in first week
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while day <= ndays:
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row = [0, 0, 0, 0, 0, 0, 0]
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for i in r7:
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if 1 <= day <= ndays: row[i] = day
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day = day + 1
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rows.append(row)
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return rows
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def prweek(theweek, width):
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"""Print a single week (no newline)."""
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print week(theweek, width),
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def week(theweek, width):
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"""Returns a single week in a string (no newline)."""
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days = []
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for day in theweek:
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if day == 0:
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s = ''
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else:
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s = '%2i' % day # right-align single-digit days
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days.append(s.center(width))
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return ' '.join(days)
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def weekheader(width):
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"""Return a header for a week."""
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if width >= 9:
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names = day_name
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else:
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names = day_abbr
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days = []
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for i in range(_firstweekday, _firstweekday + 7):
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days.append(names[i%7][:width].center(width))
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return ' '.join(days)
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def prmonth(theyear, themonth, w=0, l=0):
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"""Print a month's calendar."""
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print month(theyear, themonth, w, l),
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def month(theyear, themonth, w=0, l=0):
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"""Return a month's calendar string (multi-line)."""
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w = max(2, w)
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l = max(1, l)
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s = ((month_name[themonth] + ' ' + `theyear`).center(
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7 * (w + 1) - 1).rstrip() +
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'\n' * l + weekheader(w).rstrip() + '\n' * l)
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for aweek in monthcalendar(theyear, themonth):
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s = s + week(aweek, w).rstrip() + '\n' * l
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return s[:-l] + '\n'
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# Spacing of month columns for 3-column year calendar
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_colwidth = 7*3 - 1 # Amount printed by prweek()
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_spacing = 6 # Number of spaces between columns
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def format3c(a, b, c, colwidth=_colwidth, spacing=_spacing):
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"""Prints 3-column formatting for year calendars"""
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print format3cstring(a, b, c, colwidth, spacing)
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def format3cstring(a, b, c, colwidth=_colwidth, spacing=_spacing):
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"""Returns a string formatted from 3 strings, centered within 3 columns."""
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return (a.center(colwidth) + ' ' * spacing + b.center(colwidth) +
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' ' * spacing + c.center(colwidth))
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def prcal(year, w=0, l=0, c=_spacing):
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"""Print a year's calendar."""
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print calendar(year, w, l, c),
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def calendar(year, w=0, l=0, c=_spacing):
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"""Returns a year's calendar as a multi-line string."""
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w = max(2, w)
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l = max(1, l)
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c = max(2, c)
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colwidth = (w + 1) * 7 - 1
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s = `year`.center(colwidth * 3 + c * 2).rstrip() + '\n' * l
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header = weekheader(w)
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header = format3cstring(header, header, header, colwidth, c).rstrip()
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for q in range(January, January+12, 3):
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s = (s + '\n' * l +
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format3cstring(month_name[q], month_name[q+1], month_name[q+2],
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colwidth, c).rstrip() +
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'\n' * l + header + '\n' * l)
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data = []
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height = 0
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for amonth in range(q, q + 3):
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cal = monthcalendar(year, amonth)
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if len(cal) > height:
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height = len(cal)
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data.append(cal)
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for i in range(height):
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weeks = []
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for cal in data:
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if i >= len(cal):
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weeks.append('')
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else:
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weeks.append(week(cal[i], w))
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s = s + format3cstring(weeks[0], weeks[1], weeks[2],
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colwidth, c).rstrip() + '\n' * l
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return s[:-l] + '\n'
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EPOCH = 1970
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_EPOCH_ORD = datetime.date(EPOCH, 1, 1).toordinal()
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def timegm(tuple):
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"""Unrelated but handy function to calculate Unix timestamp from GMT."""
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year, month, day, hour, minute, second = tuple[:6]
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days = datetime.date(year, month, day).toordinal() - _EPOCH_ORD
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hours = days*24 + hour
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minutes = hours*60 + minute
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seconds = minutes*60 + second
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return seconds
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