# File lib/rack/utils/okjson.rb, line 204
  def tok(s)
    case s[0]
    when ?{  then ['{', s[0,1], s[0,1]]
    when ?}  then ['}', s[0,1], s[0,1]]
    when ?:  then [':', s[0,1], s[0,1]]
    when ?,  then [',', s[0,1], s[0,1]]
    when ?[  then ['[', s[0,1], s[0,1]]
    when ?]  then [']', s[0,1], s[0,1]]
    when ?n  then nulltok(s)
    when ?t  then truetok(s)
    when ?f  then falsetok(s)
    when ?"  then strtok(s)
    when Spc then [:space, s[0,1], s[0,1]]
    when ?\t then [:space, s[0,1], s[0,1]]
    when ?\n then [:space, s[0,1], s[0,1]]
    when ?\r then [:space, s[0,1], s[0,1]]
    else          numtok(s)
    end
  end