Class: TZInfo::TZDataDayOfMonth

Inherits:
Object
  • Object
show all
Defined in:
lib/tzinfo/tzdataparser.rb

Overview

A tz data day of the month reference. Can either be an absolute day, a last week day or a week day >= or <= than a specific day of month.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(spec) ⇒ TZDataDayOfMonth

Returns a new instance of TZDataDayOfMonth.



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# File 'lib/tzinfo/tzdataparser.rb', line 976

def initialize(spec)
  raise "Invalid on: #{spec}" if spec !~ /^([0-9]+)|(last([A-z]+))|(([A-z]+)([<>]=)([0-9]+))$/
  
  if $1
    @type = :absolute
    @day_of_month = $1.to_i
  elsif $3
    @type = :last
    @day_of_week = parse_day_of_week($3)
  else
    @type = :comparison
    @day_of_week = parse_day_of_week($5)
    @operator = parse_operator($6)
    @day_of_month = $7.to_i
  end
end

Instance Attribute Details

#day_of_month ⇒ Object (readonly)

Returns the value of attribute day_of_month.



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# File 'lib/tzinfo/tzdataparser.rb', line 972

def day_of_month
  @day_of_month
end

#day_of_week ⇒ Object (readonly)

Returns the value of attribute day_of_week.



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# File 'lib/tzinfo/tzdataparser.rb', line 973

def day_of_week
  @day_of_week
end

#operator ⇒ Object (readonly)

Returns the value of attribute operator.



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# File 'lib/tzinfo/tzdataparser.rb', line 974

def operator
  @operator
end

#type ⇒ Object (readonly)

:nodoc:



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# File 'lib/tzinfo/tzdataparser.rb', line 971

def type
  @type
end

Instance Method Details

#to_absolute(year, month) ⇒ Object

Returns the absolute day of month for the given year and month.



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# File 'lib/tzinfo/tzdataparser.rb', line 994

def to_absolute(year, month)
  case @type
    when :last
      last_day_in_month = (Date.new(year, month, 1) >> 1) - 1          
      offset = last_day_in_month.wday - @day_of_week
      offset = offset + 7 if offset < 0
      (last_day_in_month - offset).day
    when :comparison
      pivot = Date.new(year, month, @day_of_month)         
      offset = @day_of_week - pivot.wday
      offset = -offset if @operator == :less_equal
      offset = offset + 7 if offset < 0
      offset = -offset if @operator == :less_equal          
      result = pivot + offset
      if result.month != pivot.month
        puts self.inspect
        puts year
        puts month
      end
      raise 'No suitable date found' if result.month != pivot.month
      result.day          
    else #absolute
      @day_of_month
  end
end