lib/periodic/duration.rb
require 'bigdecimal'
module Periodic
module Duration
module Units
TIME = Hash.new
TIME[:seconds] = { :factor => 1, :directive => /%s/ }
TIME[:minutes] = { :factor => 60, :directive => /%m/ }
TIME[:hours] = { :factor => 3600, :directive => /%h/ }
TIME[:days] = { :factor => 3600*24, :directive => /%d/ }
# TIME[:weeks] = { :factor => 3600*24*7, :directive => /%w/ }
# TIME[:months] = { :factor => 3600*24*30, :directive => /%n/ }
TIME[:years] = { :factor => 3600*24*365, :directive => /%y/ }
TIME_ORDER = [:seconds, :minutes, :hours, :days, :years] # not working with weeks and months...
end
def self.sanitize_formatted_string(string)
if string.match(/:/) && !string.match(/[a-zA-Z ]/)
# add leading zeros where missing...
string.gsub!(/!(\d):/, '!0\1:')
string.gsub!(/^(\d):/, '0\1:')
string.gsub!(/:(\d):/, ':0\1:')
string.gsub!(/:(\d):/, ':0\1:') # needs to happen twice??
string.gsub!(/:(\d(.\d)*)$/, ':0\1')
# remove leading zero-value digitals
string.sub!(/[0:]*/, '')
else
# if the string starts with a number we can assume the value-label pairs are like '10 minutes'
if string[0,1].match(/\d/) || string[0,1] == "!"
string = string.split(/(!?\d[.\d]*[-_:, a-zA-Z]+)/).delete_if{|x| x == ""}.inject(String.new) { |memo, s| memo << ((s.match(/!/) || s.match(/[1-9]/)) ? s : "") }
# if starts with a letter we can assume the value-label pairs are like 'minutes: 10'
else
string = string.split(/([-A-Za-z: ,]+\d[.\d]*)/).delete_if{|x| x == ""}.inject(String.new) { |memo, s| memo << ((s.match(/!/) || s.match(/[1-9]/)) ? s : "") }
string.sub!(/([ ,])*([a-zA-Z]+)/, '\2')
end
# remove leading zero-value digitals
string.sub!(/[0:]*/, '')
end
string.strip.gsub(/!/, '')
end
class Duration
def initialize(seconds)
@seconds = (seconds.is_a?(Float) ? seconds.to_f : seconds)
end
def format(format = '%y:%d:%h:%m:%s', precision = nil)
string, nondirective_units, values, smallest_unit_directive = format, [], Hash.new, nil
Periodic::Duration::Units::TIME_ORDER.reverse.each_with_index do |unit, i|
if format =~ Periodic::Duration::Units::TIME[unit][:directive]
values[unit] = send(unit) + nondirective_units.inject(0) { |total, u| total += (send(u) * (Periodic::Duration::Units::TIME[u][:factor] / Periodic::Duration::Units::TIME[unit][:factor])) }
smallest_unit_directive = unit
nondirective_units.clear
else
nondirective_units << unit if (send(unit) > 0)
end
# correct for any left over time that's is fractional for all the included units
values[smallest_unit_directive] += nondirective_units.inject(0) { |total, u| total += (send(u).to_f * Periodic::Duration::Units::TIME[u][:factor] / Periodic::Duration::Units::TIME[smallest_unit_directive][:factor]) } if (!Periodic::Duration::Units::TIME_ORDER.reverse[i+1] && !nondirective_units.empty?)
end
values[smallest_unit_directive] = case precision
when nil then (values[smallest_unit_directive] % 1 == 0) && !@seconds.is_a?(Float) ? values[smallest_unit_directive].to_i : values[smallest_unit_directive]
when 0 then values[smallest_unit_directive].to_i
else (values[smallest_unit_directive] * (10 ** precision)).round / (10 ** precision).to_f
end
return Periodic::Duration.sanitize_formatted_string(values.inject(string) { |str, data| str.sub!(Periodic::Duration::Units::TIME[data[0]][:directive], data[1].to_s) })
end
Periodic::Duration::Units::TIME_ORDER.each_with_index do |unit, i|
define_method("in_" + unit.to_s) { @seconds.to_f / Periodic::Duration::Units::TIME[unit][:factor] }
define_method("whole_" + unit.to_s) { (@seconds.to_f / Periodic::Duration::Units::TIME[unit][:factor]).floor }
define_method(unit) { ((Periodic::Duration::Units::TIME_ORDER[i+1] ? BigDecimal.new(@seconds.to_f.to_s) % BigDecimal.new(Periodic::Duration::Units::TIME[Periodic::Duration::Units::TIME_ORDER[i+1]][:factor].to_f.to_s) : @seconds.to_f) / Periodic::Duration::Units::TIME[unit][:factor].to_f).send(unit == :seconds ? :to_f : :floor) }
end
end
end
end