aboutsummaryrefslogtreecommitdiffstats
path: root/activesupport/lib/active_support/duration.rb
blob: d26bbac51184ef3ccab92310794fb6f5bb707979 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
require "active_support/core_ext/array/conversions"
require "active_support/core_ext/object/acts_like"
require "active_support/core_ext/string/filters"
require "active_support/deprecation"

module ActiveSupport
  # Provides accurate date and time measurements using Date#advance and
  # Time#advance, respectively. It mainly supports the methods on Numeric.
  #
  #   1.month.ago       # equivalent to Time.now.advance(months: -1)
  class Duration
    SECONDS_PER_MINUTE = 60
    SECONDS_PER_HOUR   = 3600
    SECONDS_PER_DAY    = 86400
    SECONDS_PER_WEEK   = 604800
    SECONDS_PER_MONTH  = 2629746  # 1/12 of a gregorian year
    SECONDS_PER_YEAR   = 31556952 # length of a gregorian year (365.2425 days)

    PARTS_IN_SECONDS = {
      seconds: 1,
      minutes: SECONDS_PER_MINUTE,
      hours:   SECONDS_PER_HOUR,
      days:    SECONDS_PER_DAY,
      weeks:   SECONDS_PER_WEEK,
      months:  SECONDS_PER_MONTH,
      years:   SECONDS_PER_YEAR
    }.freeze

    attr_accessor :value, :parts

    autoload :ISO8601Parser,     "active_support/duration/iso8601_parser"
    autoload :ISO8601Serializer, "active_support/duration/iso8601_serializer"

    class << self
      # Creates a new Duration from string formatted according to ISO 8601 Duration.
      #
      # See {ISO 8601}[http://en.wikipedia.org/wiki/ISO_8601#Durations] for more information.
      # This method allows negative parts to be present in pattern.
      # If invalid string is provided, it will raise +ActiveSupport::Duration::ISO8601Parser::ParsingError+.
      def parse(iso8601duration)
        parts = ISO8601Parser.new(iso8601duration).parse!
        new(calculate_total_seconds(parts), parts)
      end

      def ===(other) #:nodoc:
        other.is_a?(Duration)
      rescue ::NoMethodError
        false
      end

      def seconds(value) #:nodoc:
        new(value, [[:seconds, value]])
      end

      def minutes(value) #:nodoc:
        new(value * SECONDS_PER_MINUTE, [[:minutes, value]])
      end

      def hours(value) #:nodoc:
        new(value * SECONDS_PER_HOUR, [[:hours, value]])
      end

      def days(value) #:nodoc:
        new(value * SECONDS_PER_DAY, [[:days, value]])
      end

      def weeks(value) #:nodoc:
        new(value * SECONDS_PER_WEEK, [[:weeks, value]])
      end

      def months(value) #:nodoc:
        new(value * SECONDS_PER_MONTH, [[:months, value]])
      end

      def years(value) #:nodoc:
        new(value * SECONDS_PER_YEAR, [[:years, value]])
      end

      private

        def calculate_total_seconds(parts)
          parts.inject(0) do |total, (part, value)|
            total + value * PARTS_IN_SECONDS[part]
          end
        end
    end

    def initialize(value, parts) #:nodoc:
      @value, @parts = value, parts.to_h
      @parts.default = 0
    end

    def coerce(other) #:nodoc:
      ActiveSupport::Deprecation.warn(<<-MSG.squish)
        Implicit coercion of ActiveSupport::Duration to a Numeric
        is deprecated and will raise a TypeError in Rails 5.2.
      MSG

      [other, value]
    end

    # Compares one Duration with another or a Numeric to this Duration.
    # Numeric values are treated as seconds.
    def <=>(other)
      if Duration === other
        value <=> other.value
      elsif Numeric === other
        value <=> other
      end
    end

    # Adds another Duration or a Numeric to this Duration. Numeric values
    # are treated as seconds.
    def +(other)
      if Duration === other
        parts = @parts.dup
        other.parts.each do |(key, value)|
          parts[key] += value
        end
        Duration.new(value + other.value, parts)
      else
        seconds = @parts[:seconds] + other
        Duration.new(value + other, @parts.merge(seconds: seconds))
      end
    end

    # Subtracts another Duration or a Numeric from this Duration. Numeric
    # values are treated as seconds.
    def -(other)
      self + (-other)
    end

    # Multiplies this Duration by a Numeric and returns a new Duration.
    def *(other)
      if Numeric === other
        Duration.new(value * other, parts.map { |type, number| [type, number * other] })
      else
        value * other
      end
    end

    # Divides this Duration by a Numeric and returns a new Duration.
    def /(other)
      if Numeric === other
        Duration.new(value / other, parts.map { |type, number| [type, number / other] })
      else
        value / other
      end
    end

    def -@ #:nodoc:
      Duration.new(-value, parts.map { |type, number| [type, -number] })
    end

    def is_a?(klass) #:nodoc:
      Duration == klass || value.is_a?(klass)
    end
    alias :kind_of? :is_a?

    def instance_of?(klass) # :nodoc:
      Duration == klass || value.instance_of?(klass)
    end

    # Returns +true+ if +other+ is also a Duration instance with the
    # same +value+, or if <tt>other == value</tt>.
    def ==(other)
      if Duration === other
        other.value == value
      else
        other == value
      end
    end

    # Returns the amount of seconds a duration covers as a string.
    # For more information check to_i method.
    #
    #   1.day.to_s # => "86400"
    def to_s
      @value.to_s
    end

    # Returns the number of seconds that this Duration represents.
    #
    #   1.minute.to_i   # => 60
    #   1.hour.to_i     # => 3600
    #   1.day.to_i      # => 86400
    #
    # Note that this conversion makes some assumptions about the
    # duration of some periods, e.g. months are always 1/12 of year
    # and years are 365.2425 days:
    #
    #   # equivalent to (1.year / 12).to_i
    #   1.month.to_i    # => 2629746
    #
    #   # equivalent to 365.2425.days.to_i
    #   1.year.to_i     # => 31556952
    #
    # In such cases, Ruby's core
    # Date[http://ruby-doc.org/stdlib/libdoc/date/rdoc/Date.html] and
    # Time[http://ruby-doc.org/stdlib/libdoc/time/rdoc/Time.html] should be used for precision
    # date and time arithmetic.
    def to_i
      @value.to_i
    end

    # Returns +true+ if +other+ is also a Duration instance, which has the
    # same parts as this one.
    def eql?(other)
      Duration === other && other.value.eql?(value)
    end

    def hash
      @value.hash
    end

    # Calculates a new Time or Date that is as far in the future
    # as this Duration represents.
    def since(time = ::Time.current)
      sum(1, time)
    end
    alias :from_now :since
    alias :after :since

    # Calculates a new Time or Date that is as far in the past
    # as this Duration represents.
    def ago(time = ::Time.current)
      sum(-1, time)
    end
    alias :until :ago
    alias :before :ago

    def inspect #:nodoc:
      parts.
        reduce(::Hash.new(0)) { |h, (l, r)| h[l] += r; h }.
        sort_by { |unit,  _ | [:years, :months, :weeks, :days, :hours, :minutes, :seconds].index(unit) }.
        map     { |unit, val| "#{val} #{val == 1 ? unit.to_s.chop : unit.to_s}" }.
        to_sentence(locale: ::I18n.default_locale)
    end

    def as_json(options = nil) #:nodoc:
      to_i
    end

    def respond_to_missing?(method, include_private = false) #:nodoc:
      @value.respond_to?(method, include_private)
    end

    # Build ISO 8601 Duration string for this duration.
    # The +precision+ parameter can be used to limit seconds' precision of duration.
    def iso8601(precision: nil)
      ISO8601Serializer.new(self, precision: precision).serialize
    end

    private

      def sum(sign, time = ::Time.current)
        parts.inject(time) do |t, (type, number)|
          if t.acts_like?(:time) || t.acts_like?(:date)
            if type == :seconds
              t.since(sign * number)
            elsif type == :minutes
              t.since(sign * number * 60)
            elsif type == :hours
              t.since(sign * number * 3600)
            else
              t.advance(type => sign * number)
            end
          else
            raise ::ArgumentError, "expected a time or date, got #{time.inspect}"
          end
        end
      end

      def method_missing(method, *args, &block)
        value.send(method, *args, &block)
      end
  end
end