Class: Array

Inherits:
Object show all
Defined in:
lib/porolog/core_ext.rb

Overview

In Porolog, Arrays are the equivalent of lists.

Instance Method Summary collapse

Instance Method Details

#/(other) ⇒ Array

Returns an Array with the Object being the head and the other Object being the tail.

Parameters:

  • other (Object) —

    the Object which is to be the tail

Returns:

  • (Array) —

    an Array with the Object being the head and the other Object being the tail.



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# File 'lib/porolog/core_ext.rb', line 146

def /(other)
  if other.is_a?(Porolog::Variable) || other.is_a?(Symbol)
    self + [Porolog::Tail.new(other)]
  else
    self + [*other]
  end
end

#clean ⇒ Array

Removes Porolog processing objects.

Returns:

  • (Array) —

    the values of its elements with variables replaced by nil and Tails replaced by UNKNOWN_TAIL.



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# File 'lib/porolog/core_ext.rb', line 125

def clean
  value.map{|element|
    if element.is_a?(Array)
      element.clean
    elsif element.is_a?(Porolog::Tail)
      Porolog::UNKNOWN_TAIL
    elsif element.is_a?(Porolog::Variable)
      nil
    else
      element.value
    end
  }
end

#goal ⇒ Porolog::Goal

Returns the goal that is most likely to be the goal for this array.

Returns:

  • (Porolog::Goal) —

    the goal that is most likely to be the goal for this array.



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# File 'lib/porolog/core_ext.rb', line 184

def goal
  map{|element| element.goal if element.respond_to?(:goal) }.flatten.find{|goal| goal.is_a?(Porolog::Goal) }
end

#head(head_size = 1) ⇒ Object

Returns the head of the Array

Parameters:

  • head_size (Integer) (defaults to: 1) —

    specifies the size of the head

Returns:

  • (Object) —

    the head of the Array



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# File 'lib/porolog/core_ext.rb', line 156

def head(head_size = 1)
  if head_size == 1
    if first == Porolog::UNKNOWN_TAIL
      nil
    else
      first
    end
  else
    self[0...head_size]
  end
end

#headtail? ⇒ Boolean

Returns whether the Object is an Array with a head and a tail.

Returns:

  • (Boolean) —

    whether the Object is an Array with a head and a tail.



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# File 'lib/porolog/core_ext.rb', line 179

def headtail?
  length == 2 && (last.is_a?(Porolog::Tail) || last == Porolog::UNKNOWN_TAIL)
end

#tail(head_size = 1) ⇒ Object

Returns the tail of the Array

Parameters:

  • head_size (Integer) (defaults to: 1) —

    specifies the size of the head

Returns:

  • (Object) —

    the tail of the Array



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# File 'lib/porolog/core_ext.rb', line 170

def tail(head_size = 1)
  if last == Porolog::UNKNOWN_TAIL
    [*self[head_size..-2], Porolog::UNKNOWN_TAIL]
  else
    [*self[head_size..-1]]
  end
end

#type ⇒ Symbol

Returns the type of the object (for an Array, should be :array)

Returns:

  • (Symbol) —

    the type of the object (for an Array, should be :array)



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# File 'lib/porolog/core_ext.rb', line 140

def type
  :array
end

#value(visited = []) ⇒ Array

Returns the values of its elements.

Returns:

  • (Array) —

    the values of its elements.



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# File 'lib/porolog/core_ext.rb', line 92

def value(visited = [])
  return self if visited.include?(self)
  visited = visited + [self]
  flat_map{|element|
    if element.is_a?(Porolog::Tail)
      tail = element.value(visited)
      if tail.is_a?(Array)
        tail
      elsif tail.is_a?(Porolog::Variable) || tail.is_a?(Porolog::Value)
        tail = tail.value(visited)
        if tail.is_a?(Array)
          tail
        elsif tail.is_a?(Porolog::Variable) || tail.is_a?(Porolog::Value)
          tail = tail.goal.variablise(tail.value(visited))
          if tail.is_a?(Array)
            tail
          else
            [element]
          end
        else
          [element]
        end
      else
        [element]
      end
    else
      [element.value(visited)]
    end
  }
end

#variables ⇒ Array

Returns embedded variables.

Returns:

  • (Array) —

    embedded variables.



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# File 'lib/porolog/core_ext.rb', line 87

def variables
  map(&:variables).flatten
end