class Chronic::Scalar

def self.scan(tokens)

:nodoc: 
def self.scan(tokens)
  # for each token
  tokens.each_index do |i|
    if t = self.scan_for_scalars(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
    if t = self.scan_for_days(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
    if t = self.scan_for_months(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
    if t = self.scan_for_years(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
  end
  tokens
end