class Mutant::Expression

def self.from_match(match)
  names = anima.attribute_names
  new(names.zip(names.map(&match.public_method(:[]))).to_h)
end

def self.new(*)
  super.freeze
end

def self.try_parse(input)
  match = self::REGEXP.match(input)
  from_match(match) if match
end

def match_length(other)
  if syntax.eql?(other.syntax)
    syntax.length
  else
    0
  end
end

def prefix?(other)
  !match_length(other).zero?
end