#!/usr/bin/env perl
  # Copyright 2010-2011 Microsoft Corporation
  
  # 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 <s> and </s> with <eps> (on both input and output sides),
  # for the G.fst acceptor.
  
  while(<>){
      @A = split(" ", $_);
      if ( @A >= 4 ) {
          if ($A[2] eq "<s>" || $A[2] eq "</s>") { $A[2] = "<eps>"; }
          if ($A[3] eq "<s>" || $A[3] eq "</s>") { $A[3] = "<eps>"; }
      }
      print join("\t", @A) . "
  ";
  }