1 require 'active_support/basic_object'
4 # Provides accurate date and time measurements using Date#advance and
5 # Time#advance, respectively. It mainly supports the methods on Numeric,
6 # such as in this example:
8 # 1.month.ago # equivalent to Time.now.advance(:months => -1)
9 class Duration
< BasicObject
10 attr_accessor
:value, :parts
12 def initialize(value
, parts
) #:nodoc:
13 @value, @parts = value
, parts
16 # Adds another Duration or a Numeric to this Duration. Numeric values
17 # are treated as seconds.
20 Duration
.new(value
+ other
.value
, @parts + other
.parts
)
22 Duration
.new(value
+ other
, @parts + [[:seconds, other
]])
26 # Subtracts another Duration or a Numeric from this Duration. Numeric
27 # values are treated as seconds.
33 Duration
.new(-value
, parts
.map
{ |type
,number
| [type
, -number
] })
36 def is_a
?(klass
) #:nodoc:
37 klass
== Duration
|| super
40 # Returns true if <tt>other</tt> is also a Duration instance with the
41 # same <tt>value</tt>, or if <tt>other == value</tt>.
50 def self.===(other
) #:nodoc:
51 other
.is_a
?(Duration
) rescue super
54 # Calculates a new Time or Date that is as far in the future
55 # as this Duration represents.
56 def since(time
= ::Time.current
)
59 alias :from_now :since
61 # Calculates a new Time or Date that is as far in the past
62 # as this Duration represents.
63 def ago(time
= ::Time.current
)
69 consolidated
= parts
.inject(::Hash.new(0)) { |h
,part
| h
[part
.first
] += part
.last
; h
}
70 [:years, :months, :days, :minutes, :seconds].map
do |length
|
71 n
= consolidated
[length
]
72 "#{n} #{n == 1 ? length.to_s.singularize : length.to_s}" if n
.nonzero
?
73 end.compact
.to_sentence(:locale => :en)
78 def sum(sign
, time
= ::Time.current
) #:nodoc:
79 parts
.inject(time
) do |t
,(type
,number
)|
80 if t
.acts_like
?(:time) || t
.acts_like
?(:date)
82 t
.since(sign
* number
)
84 t
.advance(type
=> sign
* number
)
87 raise ::ArgumentError, "expected a time or date, got #{time.inspect}"
94 def method_missing(method
, *args
, &block
) #:nodoc:
95 value
.send(method
, *args
)