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#!/usr/bin/perl -w
use strict;
use Getopt::Long "GetOptions";
my ($CORPUS,$MODEL,$TRAIN,$HELP,$VERBOSE);
my $FILLER = ":s:es";
my $MIN_SIZE = 3;
my $MIN_COUNT = 5;
my $MAX_COUNT = 5;
$HELP = 1
unless &GetOptions('corpus=s' => \$CORPUS,
'model=s' => \$MODEL,
'filler=s' => \$FILLER,
'min-size=i' => \$MIN_SIZE,
'min-count=i' => \$MIN_COUNT,
'max-count=i' => \$MAX_COUNT,
'help' => \$HELP,
'verbose' => \$VERBOSE,
'train' => \$TRAIN);
if ($HELP ||
( $TRAIN && !$CORPUS) ||
(!$TRAIN && !$MODEL)) {
print "Compound splitter\n";
print "-----------------\n\n";
print "train: compound-splitter -train -corpus txt-file -model new-model\n";
print "apply: compound-splitter -model trained-model < in > out\n";
print "options: -min-size: minimum word size (default $MIN_SIZE)\n";
print " -min-count: minimum word count (default $MIN_COUNT)\n";
print " -filler: filler letters between words (default $FILLER)\n";
exit;
}
if ($TRAIN) {
&train;
}
else {
&apply;
}
sub train {
my %WORD;
open(CORPUS,$CORPUS) || die("ERROR: could not open corpus '$CORPUS'");
while(<CORPUS>) {
chop; s/\s+/ /g; s/^ //; s/ $//;
foreach (split) {
$WORD{$_}++;
}
}
close($CORPUS);
my $id = 0;
open(MODEL,">".$MODEL);
foreach my $word (keys %WORD) {
print MODEL "".(++$id)."\t".$word."\t".$WORD{$word}."\n";
}
close(MODEL);
print STDERR "written model file with ".(scalar keys %WORD)." words.\n";
}
sub apply {
my (%WORD,%TRUECASE);
open(MODEL,$MODEL) || die("ERROR: could not open model '$MODEL'");
while(<MODEL>) {
chomp;
my ($id,$word,$count) = split(/\t/);
my $lc = lc($word);
# if word exists with multipe casings, only record most frequent
next if defined($WORD{$lc}) && $WORD{$lc} > $count;
$WORD{$lc} = $count;
$TRUECASE{$lc} = $word;
}
close(MODEL);
while(<STDIN>) {
my $first = 1;
chop; s/\s+/ /g; s/^ //; s/ $//;
foreach my $word (split) {
print " " unless $first;
$first = 0;
# don't split frequent words
if (defined($WORD{$word}) && $WORD{$word}>=$MAX_COUNT) {
print $word;
next;
}
# consider possible splits
my $final = length($word)-1;
my %REACHABLE;
for(my $i=0;$i<=$final;$i++) { $REACHABLE{$i} = (); }
print STDERR "splitting $word:\n" if $VERBOSE;
for(my $end=$MIN_SIZE;$end<length($word);$end++) {
for(my $start=0;$start<=$end-$MIN_SIZE;$start++) {
next unless $start == 0 || defined($REACHABLE{$start-1});
foreach my $filler (split(/:/,$FILLER)) {
next if $start == 0 && $filler ne "";
next if lc(substr($word,$start,length($filler))) ne $filler;
my $subword = lc(substr($word,
$start+length($filler),
$end-$start+1-length($filler)));
next unless defined($WORD{$subword});
next unless $WORD{$subword} >= $MIN_COUNT;
print STDERR "\tmatching word $start .. $end ($filler)$subword $WORD{$subword}\n" if $VERBOSE;
push @{$REACHABLE{$end}},"$start $TRUECASE{$subword} $WORD{$subword}";
}
}
}
# no matches at all?
if (!defined($REACHABLE{$final})) {
print $word;
next;
}
my ($best_split,$best_score) = ("",0);
my %ITERATOR;
for(my $i=0;$i<=$final;$i++) { $ITERATOR{$i}=0; }
my $done = 0;
while(1) {
# read off word
my ($pos,$decomp,$score,$num,@INDEX) = ($final,"",1,0);
while($pos>0) {
last unless scalar @{$REACHABLE{$pos}} > $ITERATOR{$pos}; # dead end?
my ($nextpos,$subword,$count)
= split(/ /,$REACHABLE{$pos}[ $ITERATOR{$pos} ]);
$decomp = $subword." ".$decomp;
$score *= $count;
$num++;
push @INDEX,$pos;
# print STDERR "($nextpos-$pos,$decomp,$score,$num)\n";
$pos = $nextpos-1;
}
chop($decomp);
print STDERR "\tsplit: $decomp ($score ** 1/$num) = ".($score ** (1/$num))."\n" if $VERBOSE;
$score **= 1/$num;
if ($score>$best_score) {
$best_score = $score;
$best_split = $decomp;
}
# increase iterator
my $increase = -1;
while($increase<$final) {
$increase = pop @INDEX;
$ITERATOR{$increase}++;
last if scalar @{$REACHABLE{$increase}} > $ITERATOR{$increase};
}
last unless scalar @{$REACHABLE{$final}} > $ITERATOR{$final};
for(my $i=0;$i<$increase;$i++) { $ITERATOR{$i}=0; }
}
$best_split = $word unless $best_split =~ / /; # do not change case for unsplit words
print $best_split;
}
print "\n";
}
}
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