#--
# Copyright (c) 2006 Philip Ross
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#++
module TZInfo
# Provides a method for getting Rationals for a timezone offset in seconds.
# Pre-reduced rationals are returned for all the half-hour intervals between
# -14 and +14 hours to avoid having to call gcd at runtime.
module OffsetRationals #:nodoc:
@@rational_cache = {
-50400 => Rational.send(:new!, -7,12),
-48600 => Rational.send(:new!, -9,16),
-46800 => Rational.send(:new!, -13,24),
-45000 => Rational.send(:new!, -25,48),
-43200 => Rational.send(:new!, -1,2),
-41400 => Rational.send(:new!, -23,48),
-39600 => Rational.send(:new!, -11,24),
-37800 => Rational.send(:new!, -7,16),
-36000 => Rational.send(:new!, -5,12),
-34200 => Rational.send(:new!, -19,48),
-32400 => Rational.send(:new!, -3,8),
-30600 => Rational.send(:new!, -17,48),
-28800 => Rational.send(:new!, -1,3),
-27000 => Rational.send(:new!, -5,16),
-25200 => Rational.send(:new!, -7,24),
-23400 => Rational.send(:new!, -13,48),
-21600 => Rational.send(:new!, -1,4),
-19800 => Rational.send(:new!, -11,48),
-18000 => Rational.send(:new!, -5,24),
-16200 => Rational.send(:new!, -3,16),
-14400 => Rational.send(:new!, -1,6),
-12600 => Rational.send(:new!, -7,48),
-10800 => Rational.send(:new!, -1,8),
-9000 => Rational.send(:new!, -5,48),
-7200 => Rational.send(:new!, -1,12),
-5400 => Rational.send(:new!, -1,16),
-3600 => Rational.send(:new!, -1,24),
-1800 => Rational.send(:new!, -1,48),
0 => Rational.send(:new!, 0,1),
1800 => Rational.send(:new!, 1,48),
3600 => Rational.send(:new!, 1,24),
5400 => Rational.send(:new!, 1,16),
7200 => Rational.send(:new!, 1,12),
9000 => Rational.send(:new!, 5,48),
10800 => Rational.send(:new!, 1,8),
12600 => Rational.send(:new!, 7,48),
14400 => Rational.send(:new!, 1,6),
16200 => Rational.send(:new!, 3,16),
18000 => Rational.send(:new!, 5,24),
19800 => Rational.send(:new!, 11,48),
21600 => Rational.send(:new!, 1,4),
23400 => Rational.send(:new!, 13,48),
25200 => Rational.send(:new!, 7,24),
27000 => Rational.send(:new!, 5,16),
28800 => Rational.send(:new!, 1,3),
30600 => Rational.send(:new!, 17,48),
32400 => Rational.send(:new!, 3,8),
34200 => Rational.send(:new!, 19,48),
36000 => Rational.send(:new!, 5,12),
37800 => Rational.send(:new!, 7,16),
39600 => Rational.send(:new!, 11,24),
41400 => Rational.send(:new!, 23,48),
43200 => Rational.send(:new!, 1,2),
45000 => Rational.send(:new!, 25,48),
46800 => Rational.send(:new!, 13,24),
48600 => Rational.send(:new!, 9,16),
50400 => Rational.send(:new!, 7,12)}
# Returns a Rational expressing the fraction of a day that offset in
# seconds represents (i.e. equivalent to Rational(offset, 86400)).
def rational_for_offset(offset)
@@rational_cache[offset] || Rational(offset, 86400)
end
module_function :rational_for_offset
end
end