class Chronic::Grabber

def self.scan(tokens, options)

Returns an Array of Token objects.

options - The Hash of options specified in Chronic::parse.
tokens - An Array of Token objects to scan.

each token.
Scan an Array of Tokens and apply any necessary Grabber tags to 
def self.scan(tokens, options)
  tokens.each do |token|
    if t = scan_for_all(token) then token.tag(t); next end
  end
end

def self.scan_for_all(token)

Returns a new Grabber object.

token - The Token object to scan. 
def self.scan_for_all(token)
  scan_for token, self,
  {
    /last/ => :last,
    /this/ => :this,
    /next/ => :next
  }
end

def to_s 

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