# File lib/chronic/scalar.rb, line 11
    def self.scan(tokens, options)
      tokens.each_index do |i|
        if t = scan_for_scalars(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
        if t = scan_for_days(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
        if t = scan_for_months(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
        if t = scan_for_years(tokens[i], tokens[i + 1], options) then tokens[i].tag(t) end
      end
    end