Parent: [930bdc] (diff)

Child: [507ee3] (diff)

Download this file

textsplit.cpp    459 lines (414 with data), 11.9 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
#ifndef lint
static char rcsid[] = "@(#$Id: textsplit.cpp,v 1.22 2006-04-25 08:17:36 dockes Exp $ (C) 2004 J.F.Dockes";
#endif
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef TEST_TEXTSPLIT
#include <iostream>
#include <string>
#include <set>
#include "textsplit.h"
#include "debuglog.h"
#include "utf8iter.h"
#include "uproplist.h"
#ifndef NO_NAMESPACES
using namespace std;
#endif /* NO_NAMESPACES */
/**
* Splitting a text into words. The code in this file works with utf-8
* in a semi-clean way (see uproplist.h)
*
* We are also not using capitalization information.
*
* There are a few remnants of the initial utf8-ignorant version in this file.
*/
// Character classes: we have three main groups, and then some chars
// are their own class because they want special handling.
//
// We have an array with 256 slots where we keep the character types.
// The array could be fully static, but we use a small function to fill it
// once.
// The array is actually a remnant of the original version which did no utf8
// It could be reduced to 128, because real (over 128) utf8 chars are now
// handled with a set holding all the separator values.
enum CharClass {LETTER=256, SPACE=257, DIGIT=258};
static int charclasses[256];
static set<unsigned int> unicign;
static void setcharclasses()
{
static int init = 0;
if (init)
return;
unsigned int i;
for (i = 0 ; i < 256 ; i ++)
charclasses[i] = LETTER;
for (i = 0; i < ' ';i++)
charclasses[i] = SPACE;
char digits[] = "0123456789";
for (i = 0; i < strlen(digits); i++)
charclasses[int(digits[i])] = DIGIT;
char blankspace[] = "\t\v\f ";
for (i = 0; i < strlen(blankspace); i++)
charclasses[int(blankspace[i])] = SPACE;
char seps[] = "!\"$%&()/<=>[\\]^{|}~:;*`?";
for (i = 0; i < strlen(seps); i++)
charclasses[int(seps[i])] = SPACE;
char special[] = ".@+-,#'\n\r";
for (i = 0; i < strlen(special); i++)
charclasses[int(special[i])] = special[i];
for (i = 0; i < sizeof(uniign); i++)
unicign.insert(uniign[i]);
unicign.insert((unsigned int)-1);
init = 1;
}
// Do some checking (the kind which is simpler to do here than in the
// main loop), then send term to our client.
inline bool TextSplit::emitterm(bool isspan, string &w, int pos,
int btstart, int btend)
{
LOGDEB2(("TextSplit::emitterm: '%s' pos %d\n", w.c_str(), pos));
unsigned int l = w.length();
if (l > 0 && l < (unsigned)maxWordLength) {
// 1 char word: we index single letters and digits, but
// nothing else. We might want to turn this into a test for a single
// utf8 character instead.
if (l == 1) {
int c = (int)w[0];
if (charclasses[c] != LETTER && charclasses[c] != DIGIT) {
//cerr << "ERASING single letter term " << c << endl;
return true;
}
}
if (pos != prevpos || l != prevterm.length() || w != prevterm) {
bool ret = cb->takeword(w, pos, btstart, btend);
prevterm = w;
prevpos = pos;
return ret;
}
}
return true;
}
/**
* A routine called from different places in text_to_words(), to
* adjust the current state of the parser, and call the word
* handler/emitter. Emit and reset the current word, possibly emit the current
* span (if different). In query mode, words are not emitted, only final spans
*
* This is purely for factoring common code from different places
* text_to_words().
*
* @return true if ok, false for error. Splitting should stop in this case.
* @param word Word value. This will be empty on return in ALL non-error
* cases
* @param wordpos Term position for word. Always ++ by us.
* @param span Span value
* @param spanpos Term position for the current span
* @param spanerase Set if the current span is at its end. Reset it.
* @param bp The current BYTE position in the stream
*/
inline bool TextSplit::doemit(bool spanerase, int bp)
{
#if 0
cerr << "doemit: " << "w: '" << word << "' wp: "<< wordpos << " s: '" <<
span << "' sp: " << spanpos << " spe: " << spanerase << " bp: " << bp
<< endl;
#endif
// Emit span. When splitting for query, we only emit final spans
if (spanerase) {
// Maybe trim at end These are chars that we would keep inside
// a span, but not at the end
while (span.length() > 0) {
switch (span[span.length()-1]) {
case '.':
case ',':
case '@':
case '\'':
span.resize(span.length()-1);
if (--bp < 0)
bp=0;
break;
default:
goto breakloop1;
}
}
breakloop1:
if (!emitterm(true, span, spanpos, bp-span.length(), bp))
return false;
}
// Emit word if different from span and not query mode
if (!fq && (!spanerase || (word.length() != span.length())))
if (!emitterm(false, word, wordpos, bp-word.length(), bp))
return false;
// Adjust state
wordpos++;
word.erase();
if (spanerase) {
span.erase();
spanpos = wordpos;
}
return true;
}
static inline int whatcc(unsigned int c)
{
if (c <= 127) {
return charclasses[c];
} else {
if (unicign.find(c) != unicign.end())
return SPACE;
else
return LETTER;
}
}
/**
* Splitting a text into terms to be indexed.
* We basically emit a word every time we see a separator, but some chars are
* handled specially so that special cases, ie, c++ and dockes@okyz.com etc,
* are handled properly,
*/
bool TextSplit::text_to_words(const string &in)
{
LOGDEB2(("TextSplit::text_to_words: cb %p in [%s]\n", cb,
in.substr(0,50).c_str()));
setcharclasses();
span.erase();
word.erase(); // Current word: no punctuation at all in there
number = false;
prevpos = wordpos = spanpos = charpos = 0;
prevterm.erase();
Utf8Iter it(in);
for (; !it.eof(); it++, charpos++) {
unsigned int c = *it;
if (c == (unsigned int)-1) {
LOGERR(("Textsplit: error occured while scanning UTF-8 string\n"));
return false;
}
int cc = whatcc(c);
switch (cc) {
case LETTER:
word += it;
span += it;
break;
case DIGIT:
if (word.length() == 0)
number = true;
word += it;
span += it;
break;
case SPACE:
SPACE:
if (word.length() || span.length()) {
if (!doemit(true, it.getBpos()))
return false;
number = false;
}
break;
case '-':
case '+':
if (word.length() == 0) {
if (whatcc(it[charpos+1]) == DIGIT) {
number = true;
word += it;
span += it;
} else
span += it;
} else {
if (!doemit(false, it.getBpos()))
return false;
number = false;
span += it;
}
break;
case '.':
case ',':
if (number) {
word += it;
span += it;
break;
} else {
// If . inside a word, keep it, else, this is whitespace.
// We also keep an initial '.' for catching .net, but this adds
// quite a few spurious terms !
// Another problem is that something like .x-errs
// will be split as .x-errs, x, errs but not x-errs
// A final comma in a word will be removed by doemit
if (cc == '.') {
if (word.length()) {
if (!doemit(false, it.getBpos()))
return false;
// span length could have been adjusted by trimming
// inside doemit
if (span.length())
span += it;
break;
} else {
span += it;
break;
}
}
}
goto SPACE;
break;
case '@':
if (word.length()) {
if (!doemit(false, it.getBpos()))
return false;
number = false;
}
span += it;
break;
case '\'':
// If in word, potential span: o'brien, else, this is more
// whitespace
if (word.length()) {
if (!doemit(false, it.getBpos()))
return false;
number = false;
span += it;
}
break;
case '#':
// Keep it only at end of word... Special case for c# you see...
if (word.length() > 0) {
int w = whatcc(it[charpos+1]);
if (w == SPACE || w == '\n' || w == '\r') {
word += it;
span += it;
break;
}
}
goto SPACE;
break;
case '\n':
case '\r':
if (span.length() && span[span.length() - 1] == '-') {
// if '-' is the last char before end of line, just
// ignore the line change. This is the right thing to
// do almost always. We'd then need a way to check if
// the - was added as part of the word hyphenation, or was
// there in the first place, but this would need a dictionary.
// Also we'd need to check for a soft-hyphen and remove it,
// but this would require more utf-8 magic
} else {
// Handle like a normal separator
goto SPACE;
}
break;
default:
word += it;
span += it;
break;
}
}
if (word.length() || span.length()) {
if (!doemit(true, it.getBpos()))
return false;
}
return true;
}
#else // TEST driver ->
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <iostream>
#include "textsplit.h"
#include "readfile.h"
#include "debuglog.h"
using namespace std;
// A small class to hold state while splitting text
class mySplitterCB : public TextSplitCB {
int first;
public:
mySplitterCB() : first(0) {}
bool takeword(const std::string &term, int pos, int bs, int be) {
if (first) {
printf("%3s %-20s %4s %4s\n", "pos", "Term", "bs", "be");
first = 0;
}
printf("%3d %-20s %4d %4d\n", pos, term.c_str(), bs, be);
return true;
}
};
static string teststring =
"Un bout de texte \nnormal. 2eme phrase.3eme;quatrieme.\n"
"\"Jean-Francois Dockes\" <jfd@okyz.com>\n"
"n@d @net .net t@v@c c# c++ o'brien 'o'brien' l'ami\n"
"134 +134 -14 -1.5 +1.5 1.54e10 1,2 1,2e30\n"
"@^#$(#$(*)\n"
"192.168.4.1 one\n\rtwo\r"
"Debut-\ncontinue\n"
"[olala][ululu] (valeur) (23)\n"
"utf-8 ucs-4�� \\nodef\n"
"','this\n"
" ,able,test-domain "
" -wl,--export-dynamic "
" ~/.xsession-errors "
;
static string teststring1 = " 124, ";
static string thisprog;
static string usage =
" textsplit [opts] [filename]\n"
" -q: query mode\n"
" if filename is 'stdin', will read stdin for data (end with ^D)\n"
" \n\n"
;
static void
Usage(void)
{
cerr << thisprog << ": usage:\n" << usage;
exit(1);
}
static int op_flags;
#define OPT_q 0x1
int main(int argc, char **argv)
{
thisprog = argv[0];
argc--; argv++;
while (argc > 0 && **argv == '-') {
(*argv)++;
if (!(**argv))
/* Cas du "adb - core" */
Usage();
while (**argv)
switch (*(*argv)++) {
case 'q': op_flags |= OPT_q; break;
default: Usage(); break;
}
argc--; argv++;
}
DebugLog::getdbl()->setloglevel(DEBDEB1);
DebugLog::setfilename("stderr");
mySplitterCB cb;
TextSplit splitter(&cb, (op_flags&OPT_q) ? true: false);
if (argc == 1) {
string data;
const char *filename = *argv++; argc--;
if (!strcmp(filename, "stdin")) {
char buf[1024];
int nread;
while ((nread = read(0, buf, 1024)) > 0) {
data.append(buf, nread);
}
} else if (!file_to_string(filename, data))
exit(1);
splitter.text_to_words(data);
} else {
cout << endl << teststring << endl << endl;
splitter.text_to_words(teststring);
}
}
#endif // TEST