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Diffstat (limited to 'activesupport/lib/active_support/duration.rb')
| -rw-r--r-- | activesupport/lib/active_support/duration.rb | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/duration.rb b/activesupport/lib/active_support/duration.rb new file mode 100644 index 0000000000..314c926ac0 --- /dev/null +++ b/activesupport/lib/active_support/duration.rb @@ -0,0 +1,431 @@ +# frozen_string_literal: true + +require "active_support/core_ext/array/conversions" +require "active_support/core_ext/module/delegation" +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 + class Scalar < Numeric #:nodoc: + attr_reader :value + delegate :to_i, :to_f, :to_s, to: :value + + def initialize(value) + @value = value + end + + def coerce(other) + [Scalar.new(other), self] + end + + def -@ + Scalar.new(-value) + end + + def <=>(other) + if Scalar === other || Duration === other + value <=> other.value + elsif Numeric === other + value <=> other + else + nil + end + end + + def +(other) + if Duration === other + seconds = value + other.parts[:seconds] + new_parts = other.parts.merge(seconds: seconds) + new_value = value + other.value + + Duration.new(new_value, new_parts) + else + calculate(:+, other) + end + end + + def -(other) + if Duration === other + seconds = value - other.parts[:seconds] + new_parts = other.parts.map { |part, other_value| [part, -other_value] }.to_h + new_parts = new_parts.merge(seconds: seconds) + new_value = value - other.value + + Duration.new(new_value, new_parts) + else + calculate(:-, other) + end + end + + def *(other) + if Duration === other + new_parts = other.parts.map { |part, other_value| [part, value * other_value] }.to_h + new_value = value * other.value + + Duration.new(new_value, new_parts) + else + calculate(:*, other) + end + end + + def /(other) + if Duration === other + value / other.value + else + calculate(:/, other) + end + end + + def %(other) + if Duration === other + Duration.build(value % other.value) + else + calculate(:%, other) + end + end + + private + def calculate(op, other) + if Scalar === other + Scalar.new(value.public_send(op, other.value)) + elsif Numeric === other + Scalar.new(value.public_send(op, other)) + else + raise_type_error(other) + end + end + + def raise_type_error(other) + raise TypeError, "no implicit conversion of #{other.class} into #{self.class}" + end + end + + 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 + + PARTS = [:years, :months, :weeks, :days, :hours, :minutes, :seconds].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}[https://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 + + # Creates a new Duration from a seconds value that is converted + # to the individual parts: + # + # ActiveSupport::Duration.build(31556952).parts # => {:years=>1} + # ActiveSupport::Duration.build(2716146).parts # => {:months=>1, :days=>1} + # + def build(value) + parts = {} + remainder = value.to_f + + PARTS.each do |part| + unless part == :seconds + part_in_seconds = PARTS_IN_SECONDS[part] + parts[part] = remainder.div(part_in_seconds) + remainder = (remainder % part_in_seconds).round(9) + end + end + + parts[:seconds] = remainder + + new(value, parts) + 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 + @parts.reject! { |k, v| v.zero? } + end + + def coerce(other) #:nodoc: + if Scalar === other + [other, self] + else + [Scalar.new(other), self] + end + 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 Scalar === other || Duration === other + Duration.new(value * other.value, parts.map { |type, number| [type, number * other.value] }) + elsif Numeric === other + Duration.new(value * other, parts.map { |type, number| [type, number * other] }) + else + raise_type_error(other) + end + end + + # Divides this Duration by a Numeric and returns a new Duration. + def /(other) + if Scalar === other + Duration.new(value / other.value, parts.map { |type, number| [type, number / other.value] }) + elsif Duration === other + value / other.value + elsif Numeric === other + Duration.new(value / other, parts.map { |type, number| [type, number / other] }) + else + raise_type_error(other) + end + end + + # Returns the modulo of this Duration by another Duration or Numeric. + # Numeric values are treated as seconds. + def %(other) + if Duration === other || Scalar === other + Duration.build(value % other.value) + elsif Numeric === other + Duration.build(value % other) + else + raise_type_error(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: + return "0 seconds" if parts.empty? + + parts. + sort_by { |unit, _ | PARTS.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 init_with(coder) #:nodoc: + initialize(coder["value"], coder["parts"]) + end + + def encode_with(coder) #:nodoc: + coder.map = { "value" => @value, "parts" => @parts } + 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 respond_to_missing?(method, _) + value.respond_to?(method) + end + + def method_missing(method, *args, &block) + value.public_send(method, *args, &block) + end + + def raise_type_error(other) + raise TypeError, "no implicit conversion of #{other.class} into #{self.class}" + end + end +end |