#!/usr/bin/env perl 

use warnings;
use strict;

#( (NP (NP (NN resumption)) (PP (IN of) (NP (DT the) (NN session)))) )
#( (S (@S (@S (@S (S (NP (PRP I)) (VP (VB declare) (VP (@VP (VBD resumed) (NP (@NP (NP (DT the) (NN session)) (PP (IN of) (NP (@NP (DT the) (NNP European)) (NNP Parliament)))) (VP (VBN adjourned) (PP (IN on) (NP (NNP Friday) (CD 17)))))) (NP (NNP December) (CD 1999))))) (, ,)) (CC and)) (S (NP (PRP I)) (VP (MD would) (VP (VB like) (S (ADVP (RB once) (RB again)) (VP (TO to) (VP (@VP (VB wish) (NP (PRP you))) (NP (NP (@NP (@NP (DT a) (JJ happy)) (JJ new)) (NN year)) (PP (IN in) (NP (@NP (DT the) (NN hope)) (SBAR (IN that) (S (NP (PRP you)) (VP (VBD enjoyed) (NP (@NP (@NP (DT a) (JJ pleasant)) (JJ festive)) (NN period))))))))))))))) (. .)) )

while(<STDIN>) {
  if (/^$/) {
    print "\n"; # parse failures
    next;
  }

  # parenheses
  s/\(/\-LRB\-/g; # tokens
  s/\)/\-RRB\-/g;
  s/\"LRB\"/\"\-LRB\-\"/g; # labels
  s/\"RRB\"/\"\-RRB\-\"/g;

  # main
  s/<tree label=\"([^\"]+)\">/\($1/g;
  s/ *<\/tree>/\)/g;
  s/^\(TOP/\(/;

  # de-escape
  s/\&bar;/\|/g;   # factor separator
  s/\&lt;/\</g;    # xml
  s/\&gt;/\>/g;    # xml
  s/\&bra;/\[/g;   # syntax non-terminal (legacy)
  s/\&ket;/\]/g;   # syntax non-terminal (legacy)
  s/\&quot;/\"/g;  # xml
  s/\&apos;/\'/g;  # xml
  s/\&#91;/\[/g;   # syntax non-terminal
  s/\&#93;/\]/g;   # syntax non-terminal
  s/\&amp;/\&/g;   # escape escape

  # cleanup
  s/ +/ /g;
  s/ $//g;
  s/\)$/ \)/g;

  # output
  print $_;
}