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module RiCal
class PropertyValue
#- ©2009 Rick DeNatale, All rights reserved. Refer to the file README.txt for the license
#
# RiCal::PropertyValue::CalAddress represents an icalendar Duration property value
# which is defined in
# rfc 2445 section 4.3.6 p 37
class Duration < PropertyValue
def self.value_part(unit, diff) # :nodoc:
(diff == 0) ? nil : "#{diff}#{unit}"
end
def self.from_datetimes(parent, start, finish, sign='+') # :nodoc:
if start > finish
from_datetimes(self, finish, start, '-')
else
diff = finish - start
days_diff = diff.to_i
hours = (diff - days_diff) * 24
hour_diff = hours.to_i
minutes = (hours - hour_diff) * 60
min_diff = minutes.to_i
seconds = (minutes - min_diff) * 60
sec_diff = seconds.to_i
day_part = value_part('D',days_diff)
hour_part = value_part('H', hour_diff)
min_part = value_part('M', min_diff)
sec_part = value_part('S', sec_diff)
t_part = (hour_diff.abs + min_diff.abs + sec_diff.abs) == 0 ? "" : "T"
new(parent, :value => "#{sign}P#{day_part}#{t_part}#{hour_part}#{min_part}#{sec_part}")
end
end
def self.convert(parent, ruby_object) # :nodoc:
ruby_object.to_ri_cal_duration_value
end
def value=(string) # :nodoc:
super
match = /([+-])?P(.*)$/.match(string)
@days = @hours = @minutes = @seconds = @weeks = 0
if match
@sign = match[1] == '-' ? -1 : 1
match[2].scan(/(\d+)([DHMSW])/) do |digits, unit|
number = digits.to_i
case unit
when 'D'
@days = number
when 'H'
@hours = number
when 'M'
@minutes = number
when 'S'
@seconds = number
when 'W'
@weeks = number
end
end
end
end
def self.valid_string?(string) #:nodoc:
string =~ /^[+-]?P((\d+D)(T((\d+)[HMS])+)?)|(T((\d+)[HMS])+)|(\d+W)$/
end
def days # :nodoc:
@days * @sign
end
def weeks # :nodoc:
@weeks * @sign
end
def hours # :nodoc:
@hours * @sign
end
def minutes # :nodoc:
@minutes * @sign
end
def seconds # :nodoc:
@seconds * @sign
end
# Determine whether another object is an equivalent RiCal::PropertyValue::Duration
def ==(other)
other.kind_of?(PropertyValue::Duration) && value == other.value
end
# Returns the receiver
def to_ri_cal_duration_value
self
end
# Double-dispatch method to support RiCal::PropertyValue::DateTime.-
def subtract_from_date_time_value(date_time_value)
date_time_value.advance(:weeks => -weeks, :days => -days, :hours => -hours, :minutes => -minutes, :seconds => -seconds)
end
# Double-dispatch method to support RiCal::PropertyValue::DateTime.+
def add_to_date_time_value(date_time_value)
date_time_value.advance(:weeks => weeks, :days => days, :hours => hours, :minutes => minutes, :seconds => seconds)
end
end
end
end
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