require "active_support/core_ext/array/conversions"
require "active_support/core_ext/object/acts_like"
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
# 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
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
# 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:
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
delegate :<=>, to: :value
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
