Class: Pione::Lang::CompoundFeature

Inherits:
FeaturePiece show all
Defined in:
lib/pione/lang/feature-expr.rb

Overview

CompoundFeature represents conjunction of feature pieces.

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from FeaturePiece

feature_type

Methods inherited from Piece

#eval, piece_type_name, #textize

Methods included from Util::Positionable

#line_and_column, #pos, #set_source_position

Class Method Details

.build(piece1, piece2) ⇒ Object 



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# File 'lib/pione/lang/feature-expr.rb', line 130

def build(piece1, piece2)
  # unify features if they are same
  return piece1 if piece1 == piece2

  # append if either feature is compound
  return piece1.add(piece2) if piece1.is_a?(CompoundFeature)
  return piece2.add(piece1) if piece2.is_a?(CompoundFeature)

  # create new compound feature
  new(pieces: Set.new([piece1, piece2]))
end

Instance Method Details

#add(piece) ⇒ Object 



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# File 'lib/pione/lang/feature-expr.rb', line 145

def add(piece)
  if piece.is_a?(CompoundFeature)
    set(pieces: pieces + piece.pieces)
  else
    set(pieces: pieces + Set.new([piece]))
  end
end