class Chronic::Pointer

def self.scan(tokens, options)

Returns an Array of tokens.

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

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

def self.scan_for_all(token)

Returns a new Pointer object.

token - The Token object we want to scan. 
def self.scan_for_all(token)
  scan_for token, self,
  {
    /\bpast\b/ => :past,
    /\b(?:future|in)\b/ => :future,
  }
end

def to_s 

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