Class: Span::DateDiff

Inherits:
Object
  • Object
show all
Defined in:
lib/span/date_diff.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(end_date_input, start_date_input) ⇒ DateDiff

Returns a new instance of DateDiff.



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# File 'lib/span/date_diff.rb', line 13

def initialize( end_date_input , start_date_input )
  @end_date   = end_date_input.to_date
  @start_date = start_date_input.to_date
end

Instance Attribute Details

#end_date ⇒ Object (readonly)

Returns the value of attribute end_date.



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# File 'lib/span/date_diff.rb', line 5

def end_date
  @end_date
end

#start_date ⇒ Object (readonly)

Returns the value of attribute start_date.



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# File 'lib/span/date_diff.rb', line 5

def start_date
  @start_date
end

Class Method Details

.compute(*args, &block) ⇒ Object 



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# File 'lib/span/date_diff.rb', line 9

def self.compute( *args , &block )
  new( *args , &block ).to_hash
end

Instance Method Details

#build_diff_hash ⇒ Object 



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# File 'lib/span/date_diff.rb', line 18

def build_diff_hash
  check_from = start_date

  [ :years , :months , :weeks , :days ].reduce Hash.new do | memo , part |
    check_from , num_of_part , part_singular =
      send \
        :"diff_#{ part }",
        check_from,
        part

    memo[ part_singular ] = num_of_part
    memo
  end
end

#default_diff(check_from, part, part_singular) ⇒ Object 



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# File 'lib/span/date_diff.rb', line 33

def default_diff( check_from , part , part_singular )
  num_of_part      = 0
  part_next_method = :"next_#{ part_singular }"

  loop do
    check = check_from.send part_next_method

    break if check > end_date

    check_from = check
    num_of_part += 1
  end

  [ check_from , num_of_part , part_singular ]
end

#diff_days(*args) ⇒ Object 



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# File 'lib/span/date_diff.rb', line 49

def diff_days( *args )
  default_diff *args , :day
end

#diff_months(check_from) ⇒ Object 



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# File 'lib/span/date_diff.rb', line 53

def diff_months( check_from , * )
  num_of_part = 0
  part_singular = :month
  part_next_method = :"next_#{ part_singular }"

  loop do
    check = check_from.send part_next_method

    if check > end_date
      if start_date.day != check_from.day
        day   = start_date.strftime '%d'
        month = check_from.strftime '%m'
        year  = check_from.strftime '%Y'

        date_to_try =
          begin
            Date.parse "#{ day }/#{ month }/#{ year }"
          rescue ArgumentError
            false
          end

        check_from =
          if date_to_try
            date_to_try
          else
            next_month = check_from.next_month.strftime '%m'
            Date.parse( "01/#{ next_month }/#{ year }" ).prev_day
          end
      end

      break
    end

    check_from = check
    num_of_part += 1
  end

  [ check_from , num_of_part , part_singular ]
end

#diff_weeks(check_from) ⇒ Object 



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# File 'lib/span/date_diff.rb', line 93

def diff_weeks( check_from , * )
  num_of_part = 0
  part_singular = :week
  part_next_method = :next_day
  check_from = check_from.prev_day

  loop do
    check = check_from.send part_next_method
    6.times { check = check.send part_next_method }

    break if check > end_date

    check_from = check
    num_of_part += 1
  end

  [ check_from , num_of_part , part_singular ]
end

#diff_years(*args) ⇒ Object 



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# File 'lib/span/date_diff.rb', line 112

def diff_years( *args )
  default_diff *args , :year
end

#to_hash ⇒ Object 



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# File 'lib/span/date_diff.rb', line 116

def to_hash
  @_hash ||= build_diff_hash
end