| 1 |
# -*- Mode: Cperl -*- |
| 2 |
# $Basename: Filter.pm $ |
| 3 |
# $Revision: 1.9 $ |
| 4 |
# ITIID : $ITI$ $Header $__Header$ |
| 5 |
# Author : Ulrich Pfeifer |
| 6 |
# Created On : Thu Aug 15 18:09:51 1996 |
| 7 |
# Last Modified By: Ulrich Pfeifer |
| 8 |
# Last Modified On: Sun Nov 22 18:44:46 1998 |
| 9 |
# Language : CPerl |
| 10 |
# Update Count : 105 |
| 11 |
# Status : Unknown, Use with caution! |
| 12 |
# |
| 13 |
# Copyright (c) 1996-1997, Ulrich Pfeifer |
| 14 |
# |
| 15 |
package WAIT::Filter; |
| 16 |
require WAIT; |
| 17 |
use strict; |
| 18 |
use Carp; |
| 19 |
use vars qw($VERSION @ISA @EXPORT_OK %STOP $SPLIT $UNAC $ICONV $AUTOLOAD); |
| 20 |
use subs qw(grundform); |
| 21 |
|
| 22 |
use Text::Unaccent; |
| 23 |
use Text::Iconv; |
| 24 |
|
| 25 |
require Exporter; |
| 26 |
|
| 27 |
@ISA = qw(Exporter); |
| 28 |
@EXPORT_OK = qw( |
| 29 |
Stem |
| 30 |
Soundex |
| 31 |
Phonix |
| 32 |
Metaphone |
| 33 |
isolc disolc |
| 34 |
isouc disouc |
| 35 |
isotr disotr |
| 36 |
stop grundform |
| 37 |
utf8iso |
| 38 |
); |
| 39 |
# (most implemented in WAIT.xs) |
| 40 |
|
| 41 |
$VERSION = substr q$Revision: 1.9 $, 10; |
| 42 |
|
| 43 |
sub split { |
| 44 |
map split(' ', $_), @_; |
| 45 |
} |
| 46 |
|
| 47 |
$SPLIT = q[ |
| 48 |
sub splitXXX { |
| 49 |
grep length($_)>=XXX, map split(' ', $_), @_; |
| 50 |
} |
| 51 |
]; |
| 52 |
|
| 53 |
$UNAC = q[ |
| 54 |
sub unac_CHARSET { |
| 55 |
map split(' ',unac_string('CHARSET', $_) || $_), @_; |
| 56 |
} |
| 57 |
]; |
| 58 |
|
| 59 |
my $iconv; |
| 60 |
|
| 61 |
$ICONV = q[ |
| 62 |
sub iconv_CHARSETfrom_CHARSETto { |
| 63 |
my $ic = $iconv->{'CHARSETfrom_CHARSETto'}); |
| 64 |
$ic ||= $iconv->{'CHARSETfrom_CHARSETto'} = Text::Iconv->new('CHARSETfrom','CHARSETto'); |
| 65 |
map split(' ',$ic->convert($_) || $_), @_; |
| 66 |
} |
| 67 |
]; |
| 68 |
|
| 69 |
|
| 70 |
sub AUTOLOAD { |
| 71 |
my $func = $AUTOLOAD; $func =~ s/.*:://; |
| 72 |
|
| 73 |
if ($func =~ /split(\d+)/) { |
| 74 |
my $num = $1; |
| 75 |
my $split = $SPLIT; |
| 76 |
|
| 77 |
$split =~ s/XXX/$num/g; |
| 78 |
eval $split; |
| 79 |
if ($@ eq '') { |
| 80 |
goto &$AUTOLOAD; |
| 81 |
} |
| 82 |
} elsif ($func eq 'grundform') { |
| 83 |
eval {require Text::German;}; |
| 84 |
croak "You must have Text::German to use 'grundform'" |
| 85 |
if $@ ne ''; |
| 86 |
*grundform = Text::German->can('reduce'); |
| 87 |
goto &grundform; |
| 88 |
} elsif ($func eq 'date') { |
| 89 |
eval {require Time::ParseDate;}; |
| 90 |
croak "You must have Time::ParseDate to use 'date'" |
| 91 |
if $@ ne ''; |
| 92 |
*date = Time::ParseDate->can('parsedate'); |
| 93 |
goto \&date; |
| 94 |
} elsif ($func eq 'decode_entities') { |
| 95 |
eval {require HTML::Entities;}; |
| 96 |
croak "You must have HTML::Entities to use 'decode_entities'" |
| 97 |
if $@ ne ''; |
| 98 |
*decode_entities = HTML::Entities->can('decode_entities'); |
| 99 |
goto &decode_entities; |
| 100 |
} elsif ($func =~ /^d?utf8iso$/) { |
| 101 |
no strict 'refs'; |
| 102 |
*$func = sub { |
| 103 |
# Courtesy JHI |
| 104 |
my $s = shift; |
| 105 |
$s =~ s{([\xC0-\xDF])([\x80-\xBF])} |
| 106 |
{chr(ord($1)<<6&0xC0|ord($2)&0x3F)}eg; |
| 107 |
$s; |
| 108 |
}; |
| 109 |
goto \&$func; |
| 110 |
} elsif ($func =~ /unac_(.+)/) { |
| 111 |
my $charset = $1; |
| 112 |
my $unac = $UNAC; |
| 113 |
$unac =~ s/CHARSET/$charset/g; |
| 114 |
print "### $unac ###\n"; |
| 115 |
eval $unac; |
| 116 |
if ($@ eq '') { |
| 117 |
goto &$func; |
| 118 |
} |
| 119 |
} elsif ($func =~ /iconv_([^_]+)_([^_]+)/) { |
| 120 |
my ($cf,$ct) = ($1,$2); |
| 121 |
my $iconv = $ICONV; |
| 122 |
print "### $cf -> $ct\n"; |
| 123 |
$iconv =~ s/CHARSETfrom/$cf/gs; |
| 124 |
$iconv =~ s/CHARSETto/$ct/gs; |
| 125 |
print "### $iconv ###\n"; |
| 126 |
eval $iconv; |
| 127 |
if ($@ eq '') { |
| 128 |
goto &$func; |
| 129 |
} |
| 130 |
} |
| 131 |
Carp::confess "Class WAIT::Filter::$func not found"; |
| 132 |
} |
| 133 |
|
| 134 |
while (<DATA>) { |
| 135 |
chomp; |
| 136 |
last if /__END__/; |
| 137 |
next if /^\s*#/; # there's a comment |
| 138 |
$STOP{$_}++; |
| 139 |
} |
| 140 |
close DATA; |
| 141 |
|
| 142 |
sub stop { |
| 143 |
if (exists $STOP{$_[0]}) { |
| 144 |
'' |
| 145 |
} else { |
| 146 |
$_[0]; |
| 147 |
} |
| 148 |
} |
| 149 |
|
| 150 |
sub gdate { |
| 151 |
my $date = shift; |
| 152 |
|
| 153 |
$date =~ s:(\d+)\.(\d+)\.(d+):$2/$1/$3:; |
| 154 |
date($date); |
| 155 |
} |
| 156 |
|
| 157 |
1; |
| 158 |
|
| 159 |
__DATA__ |
| 160 |
a |
| 161 |
about |
| 162 |
above |
| 163 |
according |
| 164 |
across |
| 165 |
actually |
| 166 |
adj |
| 167 |
after |
| 168 |
afterwards |
| 169 |
again |
| 170 |
against |
| 171 |
all |
| 172 |
almost |
| 173 |
alone |
| 174 |
along |
| 175 |
already |
| 176 |
also |
| 177 |
although |
| 178 |
always |
| 179 |
among |
| 180 |
amongst |
| 181 |
an |
| 182 |
and |
| 183 |
another |
| 184 |
any |
| 185 |
anyhow |
| 186 |
anyone |
| 187 |
anything |
| 188 |
anywhere |
| 189 |
are |
| 190 |
aren't |
| 191 |
around |
| 192 |
as |
| 193 |
at |
| 194 |
b |
| 195 |
be |
| 196 |
became |
| 197 |
because |
| 198 |
become |
| 199 |
becomes |
| 200 |
becoming |
| 201 |
been |
| 202 |
before |
| 203 |
beforehand |
| 204 |
begin |
| 205 |
beginning |
| 206 |
behind |
| 207 |
being |
| 208 |
below |
| 209 |
beside |
| 210 |
besides |
| 211 |
between |
| 212 |
beyond |
| 213 |
billion |
| 214 |
both |
| 215 |
but |
| 216 |
by |
| 217 |
c |
| 218 |
can |
| 219 |
can't |
| 220 |
cannot |
| 221 |
caption |
| 222 |
co |
| 223 |
co. |
| 224 |
could |
| 225 |
couldn't |
| 226 |
d |
| 227 |
did |
| 228 |
didn't |
| 229 |
do |
| 230 |
does |
| 231 |
doesn't |
| 232 |
don't |
| 233 |
down |
| 234 |
during |
| 235 |
e |
| 236 |
eg |
| 237 |
eight |
| 238 |
eighty |
| 239 |
either |
| 240 |
else |
| 241 |
elsewhere |
| 242 |
end |
| 243 |
ending |
| 244 |
enough |
| 245 |
etc |
| 246 |
even |
| 247 |
ever |
| 248 |
every |
| 249 |
everyone |
| 250 |
everything |
| 251 |
everywhere |
| 252 |
except |
| 253 |
f |
| 254 |
few |
| 255 |
fifty |
| 256 |
first |
| 257 |
five |
| 258 |
vfor |
| 259 |
former |
| 260 |
formerly |
| 261 |
forty |
| 262 |
found |
| 263 |
four |
| 264 |
from |
| 265 |
further |
| 266 |
g |
| 267 |
h |
| 268 |
had |
| 269 |
has |
| 270 |
hasn't |
| 271 |
have |
| 272 |
haven't |
| 273 |
he |
| 274 |
he'd |
| 275 |
he'll |
| 276 |
he's |
| 277 |
hence |
| 278 |
her |
| 279 |
here |
| 280 |
here's |
| 281 |
hereafter |
| 282 |
hereby |
| 283 |
herein |
| 284 |
hereupon |
| 285 |
hers |
| 286 |
herself |
| 287 |
him |
| 288 |
himself |
| 289 |
his |
| 290 |
how |
| 291 |
however |
| 292 |
hundred |
| 293 |
i |
| 294 |
i'd |
| 295 |
i'll |
| 296 |
i'm |
| 297 |
i've |
| 298 |
ie |
| 299 |
if |
| 300 |
in |
| 301 |
inc. |
| 302 |
indeed |
| 303 |
instead |
| 304 |
into |
| 305 |
is |
| 306 |
isn't |
| 307 |
it |
| 308 |
it's |
| 309 |
its |
| 310 |
itself |
| 311 |
j |
| 312 |
k |
| 313 |
l |
| 314 |
last |
| 315 |
later |
| 316 |
latter |
| 317 |
latterly |
| 318 |
least |
| 319 |
less |
| 320 |
let |
| 321 |
let's |
| 322 |
like |
| 323 |
likely |
| 324 |
ltd |
| 325 |
m |
| 326 |
made |
| 327 |
make |
| 328 |
makes |
| 329 |
many |
| 330 |
maybe |
| 331 |
me |
| 332 |
meantime |
| 333 |
meanwhile |
| 334 |
might |
| 335 |
million |
| 336 |
miss |
| 337 |
more |
| 338 |
moreover |
| 339 |
most |
| 340 |
mostly |
| 341 |
mr |
| 342 |
mrs |
| 343 |
much |
| 344 |
must |
| 345 |
my |
| 346 |
myself |
| 347 |
n |
| 348 |
namely |
| 349 |
neither |
| 350 |
never |
| 351 |
nevertheless |
| 352 |
next |
| 353 |
nine |
| 354 |
ninety |
| 355 |
no |
| 356 |
nobody |
| 357 |
none |
| 358 |
nonetheless |
| 359 |
noone |
| 360 |
nor |
| 361 |
not |
| 362 |
nothing |
| 363 |
now |
| 364 |
nowhere |
| 365 |
o |
| 366 |
of |
| 367 |
off |
| 368 |
often |
| 369 |
on |
| 370 |
once |
| 371 |
one |
| 372 |
one's |
| 373 |
only |
| 374 |
onto |
| 375 |
or |
| 376 |
other |
| 377 |
others |
| 378 |
otherwise |
| 379 |
our |
| 380 |
ours |
| 381 |
ourselves |
| 382 |
out |
| 383 |
over |
| 384 |
overall |
| 385 |
own |
| 386 |
p |
| 387 |
per |
| 388 |
perhaps |
| 389 |
q |
| 390 |
r |
| 391 |
rather |
| 392 |
recent |
| 393 |
recently |
| 394 |
s |
| 395 |
same |
| 396 |
seem |
| 397 |
seemed |
| 398 |
seeming |
| 399 |
seems |
| 400 |
seven |
| 401 |
seventy |
| 402 |
several |
| 403 |
she |
| 404 |
she'd |
| 405 |
she'll |
| 406 |
she's |
| 407 |
should |
| 408 |
shouldn't |
| 409 |
since |
| 410 |
six |
| 411 |
sixty |
| 412 |
so |
| 413 |
some |
| 414 |
somehow |
| 415 |
someone |
| 416 |
something |
| 417 |
sometime |
| 418 |
sometimes |
| 419 |
somewhere |
| 420 |
still |
| 421 |
stop |
| 422 |
such |
| 423 |
t |
| 424 |
taking |
| 425 |
ten |
| 426 |
than |
| 427 |
that |
| 428 |
that'll |
| 429 |
that's |
| 430 |
that've |
| 431 |
the |
| 432 |
their |
| 433 |
them |
| 434 |
themselves |
| 435 |
then |
| 436 |
thence |
| 437 |
there |
| 438 |
there'd |
| 439 |
there'll |
| 440 |
there're |
| 441 |
there's |
| 442 |
there've |
| 443 |
thereafter |
| 444 |
thereby |
| 445 |
therefore |
| 446 |
therein |
| 447 |
thereupon |
| 448 |
these |
| 449 |
they |
| 450 |
they'd |
| 451 |
they'll |
| 452 |
they're |
| 453 |
they've |
| 454 |
thirty |
| 455 |
this |
| 456 |
those |
| 457 |
though |
| 458 |
thousand |
| 459 |
three |
| 460 |
through |
| 461 |
throughout |
| 462 |
thru |
| 463 |
thus |
| 464 |
to |
| 465 |
together |
| 466 |
too |
| 467 |
toward |
| 468 |
towards |
| 469 |
trillion |
| 470 |
twenty |
| 471 |
two |
| 472 |
u |
| 473 |
under |
| 474 |
unless |
| 475 |
unlike |
| 476 |
unlikely |
| 477 |
until |
| 478 |
up |
| 479 |
upon |
| 480 |
us |
| 481 |
used |
| 482 |
using |
| 483 |
v |
| 484 |
very |
| 485 |
via |
| 486 |
w |
| 487 |
was |
| 488 |
wasn't |
| 489 |
we |
| 490 |
we'd |
| 491 |
we'll |
| 492 |
we're |
| 493 |
we've |
| 494 |
well |
| 495 |
were |
| 496 |
weren't |
| 497 |
what |
| 498 |
what'll |
| 499 |
what's |
| 500 |
what've |
| 501 |
whatever |
| 502 |
when |
| 503 |
whence |
| 504 |
whenever |
| 505 |
where |
| 506 |
where's |
| 507 |
whereafter |
| 508 |
whereas |
| 509 |
whereby |
| 510 |
wherein |
| 511 |
whereupon |
| 512 |
wherever |
| 513 |
whether |
| 514 |
which |
| 515 |
while |
| 516 |
whither |
| 517 |
who |
| 518 |
who'd |
| 519 |
who'll |
| 520 |
who's |
| 521 |
whoever |
| 522 |
whole |
| 523 |
whom |
| 524 |
whomever |
| 525 |
whose |
| 526 |
why |
| 527 |
will |
| 528 |
with |
| 529 |
within |
| 530 |
without |
| 531 |
won't |
| 532 |
would |
| 533 |
wouldn't |
| 534 |
x |
| 535 |
y |
| 536 |
yes |
| 537 |
yet |
| 538 |
you |
| 539 |
you'd |
| 540 |
you'll |
| 541 |
you're |
| 542 |
you've |
| 543 |
your |
| 544 |
yours |
| 545 |
yourself |
| 546 |
yourselves |
| 547 |
z |
| 548 |
# occuring in more than 100 files |
| 549 |
acc |
| 550 |
accent |
| 551 |
accents |
| 552 |
and |
| 553 |
are |
| 554 |
bell |
| 555 |
can |
| 556 |
character |
| 557 |
corrections |
| 558 |
crt |
| 559 |
daisy |
| 560 |
dash |
| 561 |
date |
| 562 |
defined |
| 563 |
definitions |
| 564 |
description |
| 565 |
devices |
| 566 |
diablo |
| 567 |
dummy |
| 568 |
factors |
| 569 |
following |
| 570 |
font |
| 571 |
for |
| 572 |
from |
| 573 |
fudge |
| 574 |
give |
| 575 |
have |
| 576 |
header |
| 577 |
holds |
| 578 |
log |
| 579 |
logo |
| 580 |
low |
| 581 |
lpr |
| 582 |
mark |
| 583 |
name |
| 584 |
nroff |
| 585 |
out |
| 586 |
output |
| 587 |
pitch |
| 588 |
put |
| 589 |
rcsfile |
| 590 |
reference |
| 591 |
resolution |
| 592 |
revision |
| 593 |
see |
| 594 |
set |
| 595 |
simple |
| 596 |
smi |
| 597 |
some |
| 598 |
string |
| 599 |
synopsis |
| 600 |
system |
| 601 |
that |
| 602 |
the |
| 603 |
this |
| 604 |
translation |
| 605 |
troff |
| 606 |
typewriter |
| 607 |
ucb |
| 608 |
unbreakable |
| 609 |
use |
| 610 |
used |
| 611 |
user |
| 612 |
vroff |
| 613 |
wheel |
| 614 |
will |
| 615 |
with |
| 616 |
you |
| 617 |
__END__ |
| 618 |
|
| 619 |
=head1 NAME |
| 620 |
|
| 621 |
WAIT::Filter - Perl extension providing the basic freeWAIS-sf reduction functions |
| 622 |
|
| 623 |
=head1 SYNOPSIS |
| 624 |
|
| 625 |
use WAIT::Filter qw(Stem Soundex Phonix isolc disolc isouc disouc |
| 626 |
isotr disotr stop grundform); |
| 627 |
|
| 628 |
$stem = Stem($word); |
| 629 |
$scode = Soundex($word); |
| 630 |
$pcode = Phonix($word); |
| 631 |
$lword = isolc($word); |
| 632 |
disolc($word); |
| 633 |
$uword = isouc($word); |
| 634 |
disouc($word); |
| 635 |
$trword = isotr($word); |
| 636 |
disotr($word); |
| 637 |
$word = stop($word); |
| 638 |
$word = grundform($word); |
| 639 |
|
| 640 |
@words = WAIT::Filter::split($word); |
| 641 |
@words = WAIT::Filter::split2($word); |
| 642 |
@words = WAIT::Filter::split3($word); |
| 643 |
@words = WAIT::Filter::split4($word); # arbitrary numbers allowed |
| 644 |
|
| 645 |
=head1 DESCRIPTION |
| 646 |
|
| 647 |
This tiny modules gives access to the basic reduction functions build |
| 648 |
in B<freeWAIS-sf>. |
| 649 |
|
| 650 |
=over 5 |
| 651 |
|
| 652 |
=item B<Stem>(I<word>) |
| 653 |
|
| 654 |
reduces I<word> using the well know Porter algorithm. |
| 655 |
|
| 656 |
AU: Porter, M.F. |
| 657 |
TI: An Algorithm for Suffix Stripping |
| 658 |
JT: Program |
| 659 |
VO: 14 |
| 660 |
PP: 130-137 |
| 661 |
PY: 1980 |
| 662 |
PM: JUL |
| 663 |
|
| 664 |
=item B<Soundex>(I<word>) |
| 665 |
|
| 666 |
|
| 667 |
computes the 4 byte B<Soundex> code for I<word>. |
| 668 |
|
| 669 |
AU: Gadd, T.N. |
| 670 |
TI: 'Fisching for Werds'. Phonetic Retrieval of written text in |
| 671 |
Information Retrieval Systems |
| 672 |
JT: Program |
| 673 |
VO: 22 |
| 674 |
NO: 3 |
| 675 |
PP: 222-237 |
| 676 |
PY: 1988 |
| 677 |
|
| 678 |
|
| 679 |
=item B<Phonix>(I<word>) |
| 680 |
|
| 681 |
computes the 8 byte B<Phonix> code for I<word>. |
| 682 |
|
| 683 |
AU: Gadd, T.N. |
| 684 |
TI: PHONIX: The Algorithm |
| 685 |
JT: Program |
| 686 |
VO: 24 |
| 687 |
NO: 4 |
| 688 |
PP: 363-366 |
| 689 |
PY: 1990 |
| 690 |
PM: OCT |
| 691 |
|
| 692 |
=back |
| 693 |
|
| 694 |
=head1 ISO charcater case functions |
| 695 |
|
| 696 |
There are some additional function which transpose some/most ISOlatin1 |
| 697 |
characters to upper and lower case. To allow for maximum speed there |
| 698 |
are also I<destructive> versions which change the argument instead of |
| 699 |
allocating a copy which is returned. For convenience, the destructive |
| 700 |
version also B<returns> the argument. So all of the following is |
| 701 |
valid and C<$word> will contain the lowercased string. |
| 702 |
|
| 703 |
$word = isolc($word); |
| 704 |
$word = disolc($word); |
| 705 |
disolc($word); |
| 706 |
|
| 707 |
Here are the hardcoded characters which are recognized: |
| 708 |
|
| 709 |
abcdefghijklmnopqrstuvwxyzàáâãäåæçèéêëìíîïñòóôõöøùúûüýß |
| 710 |
ABCDEFGHIJKLMNOPQRSTUVWXYZÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÑÒÓÔÕÖØÙÚÛÜÝß |
| 711 |
|
| 712 |
=over 5 |
| 713 |
|
| 714 |
=item C<$new = >B<isolc>C<($word)> |
| 715 |
|
| 716 |
=item B<disolc>C<($word)> |
| 717 |
|
| 718 |
transposes to lower case. |
| 719 |
|
| 720 |
=item C<$new = >B<isouc>C<($word)> |
| 721 |
|
| 722 |
=item B<disouc>C<($word)> |
| 723 |
|
| 724 |
transposes to upper case. |
| 725 |
|
| 726 |
=item C<$new = >B<isotr>C<($word)> |
| 727 |
|
| 728 |
=item B<disotr>C<($word)> |
| 729 |
|
| 730 |
Remove non-letters according to the above table. |
| 731 |
|
| 732 |
=item C<$new = >B<stop>C<($word)> |
| 733 |
|
| 734 |
Returns an empty string if $word is a stopword. |
| 735 |
|
| 736 |
=item C<$new = >B<grundform>C<($word)> |
| 737 |
|
| 738 |
Calls Text::German::reduce |
| 739 |
|
| 740 |
=item C<$new = >B<utf8iso>C<($word)> |
| 741 |
|
| 742 |
Deprecated due to flux in perl versions between 5.005 and 5.8. The |
| 743 |
function converts UTF8 encoded strings to ISO-8859-1. WAIT is |
| 744 |
internally still based on the Latin1 character set, so if you process |
| 745 |
anything in a different encoding, you should convert to Latin1 as the |
| 746 |
first filter or refrain from using the iso-latin-1 based filter |
| 747 |
functions. It is recommended that you use your own converter based on |
| 748 |
the perl version you're using. |
| 749 |
|
| 750 |
=item split, split2, split3, ... |
| 751 |
|
| 752 |
The splitN funtions all take a scalar as input and return a list of |
| 753 |
words. Split acts just like the perl split(' '). Split2 eliminates all |
| 754 |
words from the list that are shorter than 2 characters (bytes), split3 |
| 755 |
eliminates those shorter than 3 characters (bytes) and so on. |
| 756 |
|
| 757 |
=back |
| 758 |
|
| 759 |
=head1 AUTHOR |
| 760 |
|
| 761 |
Ulrich Pfeifer E<lt>F<pfeifer@ls6.informatik.uni-dortmund.de>E<gt> |
| 762 |
|
| 763 |
=head1 SEE ALSO |
| 764 |
|
| 765 |
perl(1). |
| 766 |
|
| 767 |
=cut |
| 768 |
|
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