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author | Michael Koziarski <michael@koziarski.com> | 2007-01-15 06:54:50 +0000 |
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committer | Michael Koziarski <michael@koziarski.com> | 2007-01-15 06:54:50 +0000 |
commit | 276c9f29cde80fafa23814b0039f67504255e0fd (patch) | |
tree | 15a17ddcaff52bd1aaabf70281dbe7c7ac2d1433 /activesupport/lib/active_support | |
parent | 51d840e272941023ad62d021fa2b4a491fe9953a (diff) | |
download | rails-276c9f29cde80fafa23814b0039f67504255e0fd.tar.gz rails-276c9f29cde80fafa23814b0039f67504255e0fd.tar.bz2 rails-276c9f29cde80fafa23814b0039f67504255e0fd.zip |
Make 1.months and friends accurate by introducing a Duration class. #6835 [eventualbuddha]
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5940 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
Diffstat (limited to 'activesupport/lib/active_support')
5 files changed, 182 insertions, 11 deletions
diff --git a/activesupport/lib/active_support/core_ext/date.rb b/activesupport/lib/active_support/core_ext/date.rb index 239b8c140a..effb749c25 100644 --- a/activesupport/lib/active_support/core_ext/date.rb +++ b/activesupport/lib/active_support/core_ext/date.rb @@ -1,6 +1,8 @@ require 'date' +require File.dirname(__FILE__) + '/date/calculations' require File.dirname(__FILE__) + '/date/conversions' class Date#:nodoc: + include ActiveSupport::CoreExtensions::Date::Calculations include ActiveSupport::CoreExtensions::Date::Conversions end diff --git a/activesupport/lib/active_support/core_ext/date/calculations.rb b/activesupport/lib/active_support/core_ext/date/calculations.rb new file mode 100644 index 0000000000..f81cd9187e --- /dev/null +++ b/activesupport/lib/active_support/core_ext/date/calculations.rb @@ -0,0 +1,41 @@ +module ActiveSupport #:nodoc: + module CoreExtensions #:nodoc: + module Date #:nodoc: + # Enables the use of time calculations within Time itself + module Calculations + def self.included(base) #:nodoc: + base.send(:include, ClassMethods) + + base.send(:alias_method, :plus_without_duration, :+) + base.send(:alias_method, :+, :plus_with_duration) + + base.send(:alias_method, :minus_without_duration, :-) + base.send(:alias_method, :-, :minus_with_duration) + end + + module ClassMethods + def plus_with_duration(other) #:nodoc: + if ActiveSupport::Duration === other + other.since(self) + else + plus_without_duration(other) + end + end + + def minus_with_duration(other) #:nodoc: + self.plus_with_duration(-other) + end + + # Provides precise Date calculations for years, months, and days. The +options+ parameter takes a hash with + # any of these keys: :months, :days, :years. + def advance(options) + d = ::Date.new(year + (options.delete(:years) || 0), month, day) + d = d >> options.delete(:months) if options[:months] + d = d + options.delete(:days) if options[:days] + d + end + end + end + end + end +end
\ No newline at end of file diff --git a/activesupport/lib/active_support/core_ext/numeric/time.rb b/activesupport/lib/active_support/core_ext/numeric/time.rb index 93740046db..aac698f7a8 100644 --- a/activesupport/lib/active_support/core_ext/numeric/time.rb +++ b/activesupport/lib/active_support/core_ext/numeric/time.rb @@ -3,51 +3,70 @@ module ActiveSupport #:nodoc: module Numeric #:nodoc: # Enables the use of time calculations and declarations, like 45.minutes + 2.hours + 4.years. # - # If you need precise date calculations that doesn't just treat months as 30 days, then have - # a look at Time#advance. + # These methods use Time#advance for precise date calculations when using from_now, ago, etc. + # as well as adding or subtracting their results from a Time object. For example: + # + # # equivalent to Time.now.advance(:months => 1) + # 1.month.from_now + # + # # equivalent to Time.now.advance(:years => 2) + # 2.years.from_now + # + # # equivalent to Time.now.advance(:months => 4, :years => 5) + # (4.months + 5.years).from_now # - # Some of these methods are approximations, Ruby's core + # While these methods provide precise calculation when used as in the examples above, care + # should be taken to note that this is not true if the result of `months', `years', etc is + # converted before use: + # + # # equivalent to 30.days.to_i.from_now + # 1.month.to_i.from_now + # + # # equivalent to 365.25.days.to_f.from_now + # 1.year.to_f.from_now + # + # In such cases, Ruby's core # Date[http://stdlib.rubyonrails.org/libdoc/date/rdoc/index.html] and # Time[http://stdlib.rubyonrails.org/libdoc/time/rdoc/index.html] should be used for precision # date and time arithmetic module Time def seconds - self + ActiveSupport::Duration.new(self, [[:seconds, self]]) end alias :second :seconds def minutes - self * 60 + ActiveSupport::Duration.new(self * 60, [[:seconds, self * 60]]) end alias :minute :minutes def hours - self * 60.minutes + ActiveSupport::Duration.new(self * 3600, [[:seconds, self * 3600]]) end alias :hour :hours def days - self * 24.hours + ActiveSupport::Duration.new(self * 24.hours, [[:days, self]]) end alias :day :days def weeks - self * 7.days + ActiveSupport::Duration.new(self * 7.days, [[:days, self * 7]]) end alias :week :weeks def fortnights - self * 2.weeks + ActiveSupport::Duration.new(self * 2.weeks, [[:days, self * 14]]) end alias :fortnight :fortnights def months - self * 30.days + ActiveSupport::Duration.new(self * 30.days, [[:months, self]]) end alias :month :months def years - (self * 365.25.days).to_i + ActiveSupport::Duration.new(self * 365.25.days, [[:years, self]]) end alias :year :years diff --git a/activesupport/lib/active_support/core_ext/time/calculations.rb b/activesupport/lib/active_support/core_ext/time/calculations.rb index cd412368dc..70a4768d13 100644 --- a/activesupport/lib/active_support/core_ext/time/calculations.rb +++ b/activesupport/lib/active_support/core_ext/time/calculations.rb @@ -5,6 +5,11 @@ module ActiveSupport #:nodoc: module Calculations def self.included(base) #:nodoc: base.extend(ClassMethods) + + base.send(:alias_method, :plus_without_duration, :+) + base.send(:alias_method, :+, :plus_with_duration) + base.send(:alias_method, :minus_without_duration, :-) + base.send(:alias_method, :-, :minus_with_duration) end module ClassMethods @@ -190,6 +195,22 @@ module ActiveSupport #:nodoc: def tomorrow self.since(1.day) end + + def plus_with_duration(other) #:nodoc: + if ActiveSupport::Duration === other + other.since(self) + else + plus_without_duration(other) + end + end + + def minus_with_duration(other) #:nodoc: + if ActiveSupport::Duration === other + other.until(self) + else + minus_without_duration(other) + end + end end end end diff --git a/activesupport/lib/active_support/duration.rb b/activesupport/lib/active_support/duration.rb new file mode 100644 index 0000000000..66b6941c5c --- /dev/null +++ b/activesupport/lib/active_support/duration.rb @@ -0,0 +1,88 @@ +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 < Builder::BlankSlate + 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 + + 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.now) + 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.now) + 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, :hours, :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.now) #:nodoc: + parts.inject(time) do |t,(type,number)| + case t + when ::Time + if type == :seconds + t + (sign * number) + else + t.advance(type => sign * number) + end + when ::Date + raise ArgumentError, "Adding seconds to a Date does not make sense" if type == :seconds + t.advance(type => sign * number) + end + end + end + + private + + def method_missing(method, *args, &block) #:nodoc: + value.send(method, *args) + end + end +end
\ No newline at end of file |