#!/usr/bin/perl
# Copyright 2010-2012 Microsoft Corporation  Johns Hopkins University (Author: Daniel Povey)

# 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.


$ignore_oov = 0;

for($x = 0; $x < 2; $x++) {
  if ($ARGV[0] eq "--map-oov") {
    shift @ARGV; 
    $map_oov = shift @ARGV;
    if ($map_oov eq "-f" || $map_oov =~ m/words\.txt$/ || $map_oov eq "") {
      # disallow '-f', the empty string and anything ending in words.txt as the
      # OOV symbol because these are likely command-line errors.
      die "the --map-oov option requires an argument";
    }
  }
  if ($ARGV[0] eq "-f") {
    shift @ARGV; 
    $field_spec = shift @ARGV; 
    if ($field_spec =~ m/^\d+$/) {
      $field_begin = $field_spec - 1; $field_end = $field_spec - 1;
    }
    if ($field_spec =~ m/^(\d*)[-:](\d*)/) { # accept e.g. 1:10 as a courtesty (properly, 1-10)
      if ($1 ne "") {
        $field_begin = $1 - 1;  # Change to zero-based indexing.
      }
      if ($2 ne "") {
        $field_end = $2 - 1;    # Change to zero-based indexing.
      }
    }
    if (!defined $field_begin && !defined $field_end) {
      die "Bad argument to -f option: $field_spec"; 
    }
  }
}

$symtab = shift @ARGV;
if (!defined $symtab) {
  print STDERR "Usage: sym2int.pl [options] symtab [input transcriptions] > output transcriptions\n" .
    "options: [--map-oov <oov-symbol> ]  [-f <field-range> ]\n" .
      "note: <field-range> can look like 4-5, or 4-, or 5-, or 1.\n";
}
open(F, "<$symtab") || die "Error opening symbol table file $symtab";
while(<F>) {
    @A = split(" ", $_);
    @A == 2 || die "bad line in symbol table file: $_";
    $sym2int{$A[0]} = $A[1] + 0;
}

if (defined $map_oov && $map_oov !~ m/^\d+$/) { # not numeric-> look it up
  if (!defined $sym2int{$map_oov}) { die "OOV symbol $map_oov not defined."; }
  $map_oov = $sym2int{$map_oov};
}

$num_warning = 0;
$max_warning = 20;

while (<>) {
  @A = split(" ", $_);
  @B = ();
  for ($n = 0; $n < @A; $n++) {
    $a = $A[$n];
    if ( (!defined $field_begin || $n >= $field_begin)
         && (!defined $field_end || $n <= $field_end)) {
      $i = $sym2int{$a};
      if (!defined ($i)) {
        if (defined $map_oov) {
          if ($num_warning++ < $max_warning) {
            print STDERR "sym2int.pl: replacing $a with $map_oov\n";
            if ($num_warning == $max_warning) {
              print STDERR "sym2int.pl: not warning for OOVs any more times\n";
            }
          }
          $i = $map_oov;
        } else {
          $pos = $n+1;
          die "sym2int.pl: undefined symbol $a (in position $pos)\n";
        }
      }
      $a = $i;
    }
    push @B, $a;
  }
  print join(" ", @B);
  print "\n";
}
if ($num_warning > 0) {
  print STDERR "** Replaced $num_warning instances of OOVs with $map_oov\n"; 
}

exit(0);