#!/usr/bin/env perl
  # Copyright 2010-2011 Microsoft Corporation
  #                2015 Guoguo Chen
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #  http://www.apache.org/licenses/LICENSE-2.0
  #
  # THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
  # WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
  # MERCHANTABLITY OR NON-INFRINGEMENT.
  # See the Apache 2 License for the specific language governing permissions and
  # limitations under the License.
  
  # This script replaces epsilon with #0 on the input side only, of the G.fst
  # acceptor.  
  
  while(<>){
    if (/\s+#0\s+/) {
      print STDERR "$0: ERROR: LM has word #0, " .
                   "which is reserved as disambiguation symbol
  ";
      exit 1;
    }
    s:^(\d+\s+\d+\s+)\<eps\>(\s+):$1#0$2:;
    print;
  }