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211 lines
6.9 KiB
Python
211 lines
6.9 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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# Revision 2: uses functions from built-in time module
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# Import functions and variables from time module
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from time import localtime, mktime, strftime
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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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# 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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class _localized_name:
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def __init__(self, format):
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self.format = format
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def __getitem__(self, item):
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return strftime(self.format, (item,)*9).capitalize()
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# Full and abbreviated names of weekdays
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day_name = _localized_name('%A')
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day_abbr = _localized_name('%a')
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# Full and abbreviated names of months (1-based arrays!!!)
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month_name = _localized_name('%B')
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month_abbr = _localized_name('%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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secs = mktime((year, month, day, 0, 0, 0, 0, 0, 0))
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tuple = localtime(secs)
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return tuple[6]
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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 _center(str, width):
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"""Center a string in a field."""
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n = width - len(str)
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if n <= 0:
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return str
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return ' '*((n+1)/2) + str + ' '*((n)/2)
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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(_center(s, 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(_center(names[i%7][:width], 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 = (_center(month_name[themonth] + ' ' + `theyear`,
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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 (_center(a, colwidth) + ' ' * spacing + _center(b, colwidth) +
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' ' * spacing + _center(c, 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 = _center(`year`, 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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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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assert year >= EPOCH
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assert 1 <= month <= 12
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days = 365*(year-EPOCH) + leapdays(EPOCH, year)
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for i in range(1, month):
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days = days + mdays[i]
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if month > 2 and isleap(year):
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days = days + 1
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days = days + day - 1
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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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