Class: Calyx::Grammar::Production::Concat

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

Constant Summary collapse

DELIMITER = 
/(\{[A-Za-z0-9_]+\})/.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(expansion) ⇒ Concat 



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# File 'lib/calyx.rb', line 72

def initialize(expansion)
  @expansion = expansion
end

Class Method Details

.parse(production) ⇒ Object 



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# File 'lib/calyx.rb', line 56

def self.parse(production)
  expansion = production.split(DELIMITER).map do |atom|
    if atom.is_a?(String)
      if atom.chars.first == '{' && atom.chars.last == '}'
        NonTerminal.new(atom.slice(1, atom.length-2))
      else
        Terminal.new(atom)
      end
    elsif atom.is_a?(Symbol)
      NonTerminal.new
    end
  end

  self.new(expansion)
end

Instance Method Details

#evaluate(registry) ⇒ Object 



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# File 'lib/calyx.rb', line 76

def evaluate(registry)
  @expansion.reduce('') do |exp, atom|
    exp << atom.evaluate(registry)
  end
end