----------------------------------------
-- Lower to upper case (ASCII only)
-- @param {string} str
-- @return {string}
----------------------------------------
on toUpper (str)
  alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  len = str.length
  repeat with i = 1 to len
    pos = offset(str.char[i], alphabet)
    if pos > 0 then put alphabet.char[pos] into char i of str
  end repeat
  return str
end

----------------------------------------
-- Upper to lower case (ASCII only)
-- @param {string} str
-- @return {string}
----------------------------------------
on toLower (str)
  alphabet = "abcdefghijklmnopqrstuvwxyz"
  len = str.length
  repeat with i = 1 to len
    pos = offset(str.char[i], alphabet)
    if pos > 0 then put alphabet.char[pos] into char i of str
  end repeat
  return str
end