class Chronic::Grabber

def self.scan(tokens, options)
  tokens.each_index do |i|
    if t = scan_for_all(tokens[i]) then tokens[i].tag(t); next end
  end
end

def self.scan_for_all(token)
  scan_for token, self,
  {
    /last/ => :last,
    /this/ => :this,
    /next/ => :next
  }
end

def to_s
  'grabber-' << @type.to_s
end