Class: About_Pos::Meta

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

Overview

class self ===

Instance Method Summary collapse

Constructor Details

#initialize(dir, real_index, i, arr, prev = nil) ⇒ Meta

Returns a new instance of Meta.



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# File 'lib/about_pos.rb', line 41

def initialize dir, real_index, i, arr, prev = nil
  @arr        = arr
  @data       = {}
  @dir        = dir
  @last_index = arr.size - 1

  @real_index = real_index
  @value      = arr[real_index]
  @i          = i

  @next = nil
  @prev = prev
end

Instance Method Details

#[](k) ⇒ Object 



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# File 'lib/about_pos.rb', line 143

def [] k
  @data[k]
end

#[]=(k, v) ⇒ Object 



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# File 'lib/about_pos.rb', line 147

def []= k, v
  @data[k] = v
end

#back? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 107

def back?
  dir == :back
end

#bottom? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 139

def bottom?
  real_index == last_index
end

#dir ⇒ Object 



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# File 'lib/about_pos.rb', line 103

def dir
  @dir
end

#forward? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 111

def forward?
  dir == :forward
end

#middle? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 135

def middle?
  real_index != 0 && real_index != last_index
end

#next ⇒ Object

Raises:



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# File 'lib/about_pos.rb', line 69

def next
  @msg ||= if forward?
             "This is the last position."
           else
             "This is the first position."
           end
  raise No_Next, @msg if !next?

  @next ||= begin
              if forward?
                Meta.new(dir, real_index + 1, self.i + 1, arr, self)
              else
                Meta.new(dir, real_index - 1, self.i - 1, arr, self)
              end
            end
end

#next? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 115

def next?
  if forward?
    real_index != last_index
  else
    real_index != 0
  end
end

#prev ⇒ Object

Raises:



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# File 'lib/about_pos.rb', line 86

def prev
  @msg ||= if forward?
             "This is the first position."
           else
             "This is the last position."
           end
  raise No_Prev, @msg if !prev?

  @prev ||= begin
              if forward?
                Meta.new(dir, real_index - 1, self.i - 1, arr)
              else
                Meta.new(dir, real_index + 1, self.i + 1, arr)
              end
            end
end

#prev? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 123

def prev?
  if forward?
    real_index != 0
  else
    real_index != last_index
  end
end

#top? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 131

def top?
  real_index == 0
end