Froze rails gems

[depot.git] / vendor / rails / activesupport / lib / active_support / duration.rb

diff --git a/vendor/rails/activesupport/lib/active_support/duration.rb b/vendor/rails/activesupport/lib/active_support/duration.rb
new file mode 100644 (file)
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+++ b/vendor/rails/activesupport/lib/active_support/duration.rb
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+module ActiveSupport
+  # Provides accurate date and time measurements using Date#advance and 
+  # Time#advance, respectively. It mainly supports the methods on Numeric,
+  # such as in this example:
+  #
+  #   1.month.ago       # equivalent to Time.now.advance(:months => -1)
+  class Duration < BasicObject
+    attr_accessor :value, :parts
+
+    def initialize(value, parts) #:nodoc:
+      @value, @parts = value, parts
+    end
+
+    # Adds another Duration or a Numeric to this Duration. Numeric values
+    # are treated as seconds.
+    def +(other)
+      if Duration === other
+        Duration.new(value + other.value, @parts + other.parts)
+      else
+        Duration.new(value + other, @parts + [[:seconds, other]])
+      end
+    end
+
+    # Subtracts another Duration or a Numeric from this Duration. Numeric
+    # values are treated as seconds.
+    def -(other)
+      self + (-other)
+    end
+
+    def -@ #:nodoc:
+      Duration.new(-value, parts.map { |type,number| [type, -number] })
+    end
+
+    def is_a?(klass) #:nodoc:
+      klass == Duration || super
+    end
+
+    # Returns true if <tt>other</tt> is also a Duration instance with the
+    # same <tt>value</tt>, or if <tt>other == value</tt>.
+    def ==(other)
+      if Duration === other
+        other.value == value
+      else
+        other == value
+      end
+    end
+
+    def self.===(other) #:nodoc:
+      other.is_a?(Duration) rescue super
+    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
+
+    # 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
+
+    def inspect #:nodoc:
+      consolidated = parts.inject(::Hash.new(0)) { |h,part| h[part.first] += part.last; h }
+      [:years, :months, :days, :minutes, :seconds].map do |length|
+        n = consolidated[length]
+        "#{n} #{n == 1 ? length.to_s.singularize : length.to_s}" if n.nonzero?
+      end.compact.to_sentence
+    end
+
+    protected
+
+      def sum(sign, time = ::Time.current) #:nodoc:
+        parts.inject(time) do |t,(type,number)|
+          if t.acts_like?(:time) || t.acts_like?(:date)
+            if type == :seconds
+              t.since(sign * number)
+            else
+              t.advance(type => sign * number)
+            end
+          else
+            raise ::ArgumentError, "expected a time or date, got #{time.inspect}"
+          end
+        end
+      end
+
+    private
+
+      def method_missing(method, *args, &block) #:nodoc:
+        value.send(method, *args)
+      end
+  end
+end