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, arr, prev = nil) ⇒ Meta

Returns a new instance of Meta.



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# File 'lib/about_pos.rb', line 45

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

  @real_index = real_index

  @next = nil
  @prev = prev
end

Instance Method Details

#[](k) ⇒ Object 



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# File 'lib/about_pos.rb', line 158

def [] k
  @data[k]
end

#[]=(k, v) ⇒ Object 



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# File 'lib/about_pos.rb', line 162

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

#back? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 122

def back?
  dir == :back
end

#bottom? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 154

def bottom?
  real_index == last_index
end

#dir ⇒ Object 



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# File 'lib/about_pos.rb', line 118

def dir
  @dir
end

#forward? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 126

def forward?
  dir == :forward
end

#grab ⇒ Object

Raises:



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# File 'lib/about_pos.rb', line 74

def grab
  raise No_Next, "No more values to grab" unless next?
  if forward?
    @real_index += 1
  else
    @real_index -= 1
  end
  value
end

#middle? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 150

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

#next ⇒ Object

Raises:



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# File 'lib/about_pos.rb', line 84

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, arr, self)
              else
                Meta.new(dir, real_index - 1, arr, self)
              end
            end
end

#next? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 130

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 101

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, arr)
              else
                Meta.new(dir, real_index + 1, arr)
              end
            end
end

#prev? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/about_pos.rb', line 138

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 146

def top?
  real_index == 0
end

#value ⇒ Object 



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# File 'lib/about_pos.rb', line 57

def value
  arr[real_index]
end