Class: Elus::Rule

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

Instance Method Summary collapse

Constructor Details

#initialize(condition, yes, no = nil) ⇒ Rule

Returns a new instance of Rule.

Raises:



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# File 'lib/elus/rule.rb', line 3

def initialize(condition, yes, no=nil)
  @condition = Piece === condition ? condition : Piece.create(condition)
  raise Invalid,  "Wrong condition" unless @condition
  @yes = Piece === yes ? yes : Piece.create(yes)
  raise Invalid,  "Wrong yes branch" unless @yes
  @no = if Piece === no 
          no 
        elsif Piece.create(no)
          Piece.create(no) 
        elsif no
          raise( Invalid, "Wrong no branch")
        else
          nil
        end
end

Instance Method Details

#apply(other) ⇒ Object 



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# File 'lib/elus/rule.rb', line 26

def apply(other)
  piece = Piece === other ? other : Piece.create(other)
  return nil unless piece
  if piece == @condition
    piece * @yes
  else
    piece * @no
  end
end

#name ⇒ Object

Returns full text name of this Rule



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# File 'lib/elus/rule.rb', line 20

def name
  "If last Piece is #{@condition.name} Piece, #{@yes.name} Piece is next" + if @no then ", otherwise #{@no.name} Piece is next" else "" end
end

#to_s ⇒ Object 



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# File 'lib/elus/rule.rb', line 24

def to_s; name end