#
#   Example 6
#

from Plex import *

letter = Range("AZaz")
digit = Range("09")
name = letter + Rep(letter | digit)
number = Rep1(digit)
space = Any(" \t\n")

lexicon = Lexicon([
  (name,        'ident'),
  (number,      'int'),
  (space,       IGNORE),
  (Str("(*"),   Begin('comment1')),
  (Str("{"),    Begin('comment2')),
  State('comment1', [
    (Str("*)"), Begin('')),
    (AnyChar,   IGNORE)
  ]),
  State('comment2', [
    (Str("}"),  Begin('')),
    (AnyChar,   IGNORE)
  ])
])

filename = "example6.in"
f = open(filename, "r")
scanner = Scanner(lexicon, f, filename)
while 1:
  token = scanner.read()
  print token
  if token[0] is None:
    break