#!/usr/bin/env python

"""
dfa_min.py

Usage: dfa_min.py <dfaspec>

Read a Deteministic Finite Automaton specification and minimize it.

Options:

-h
--help
  Print this help.

-d
--dot
  Print a description of the automaton in the Graphviz language
  suitable for processing with dot to get a graphical representation
  of the automaton.

-p
--print
  Print back the automaton in tabular form.

-g
--graphviz
  Parse the automaton in Graphviz format (default is tabular
  form). This is not the most robust parser - caveat emptor!

Copyright 2015 Stephan Schulz, schulz@eprover.org

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program ; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA  02111-1307 USA

The original copyright holder can be contacted as

Stephan Schulz
DHBW Stuttgart
Informatik
Postfach 10 05 63
D-70004 Stuttgart
Germany

or via email (address above).
"""

import sys
import getopt
from pylib_dfa import DFA

dot = False
prt = False
gv  = False

if __name__ == '__main__':
    opts, args = getopt.gnu_getopt(sys.argv[1:], "hdpg", ["help",
    "dot", "print", "graphviz"])

    for option, optarg in opts:
        if option in ["-h", "--help"]:
            print (__doc__)
            sys.exit()
        elif option in ["-d", "--dot"]:
            dot = True
        elif option in ["-p", "--print"]:
            prt = True
        elif option in ["-g", "--graphviz"]:
            gv = True
        else:
            sys.exit("Unknown option "+ option)

    if len(args)<1:
        file = sys.stdin
    else:
        file = open(args[0], "r")
    str  = file.read()
    if file!=sys.stdin:
        file.close()

    dfa = DFA()
    if gv:
        dfa.parse_gv(str)
    else:
        dfa.parse(str)

    # print (dfa)
    table = dfa.minimize()
    print (table)

    if prt:
        print (dfa)
        print
    if dot:
        print (dfa.dotify())
        print