Parent: [7ddbbb] (diff)

Child: [cbc269] (diff)

Download this file

wasastringtoquery.cpp    513 lines (465 with data), 14.3 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
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
/* Copyright (C) 2006 J.F.Dockes
* 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_WASASTRINGTOQUERY
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>
#include "smallut.h"
#include "wasastringtoquery.h"
#undef DEB_WASASTRINGTOQ
#ifdef DEB_WASASTRINGTOQ
#define DPRINT(X) fprintf X
#define DUMPQ(Q) {string D;Q->describe(D);fprintf(stderr, "%s\n", D.c_str());}
#else
#define DPRINT(X)
#define DUMPQ(Q)
#endif
WasaQuery::~WasaQuery()
{
for (vector<WasaQuery*>::iterator it = m_subs.begin();
it != m_subs.end(); it++) {
delete *it;
}
m_subs.clear();
}
static const char* reltosrel(WasaQuery::Rel rel)
{
switch (rel) {
case WasaQuery::REL_EQUALS: return "=";
case WasaQuery::REL_CONTAINS: return ":";
case WasaQuery::REL_LT: return "<";
case WasaQuery::REL_LTE: return "<=";
case WasaQuery::REL_GT: return ">";
case WasaQuery::REL_GTE: return ">=";
default: return "?";
}
}
void WasaQuery::describe(string &desc) const
{
desc += "(";
string fieldspec = m_fieldspec.empty() ? string() : m_fieldspec +
reltosrel(m_rel);
switch (m_op) {
case OP_NULL:
desc += "NULL";
break;
case OP_LEAF:
desc += fieldspec + m_value;
break;
case OP_EXCL:
desc += string("NOT (" ) + fieldspec + m_value + ") ";
break;
case OP_OR:
case OP_AND:
for (vector<WasaQuery *>::const_iterator it = m_subs.begin();
it != m_subs.end(); it++) {
(*it)->describe(desc);
vector<WasaQuery *>::const_iterator it1 = it;
it1++;
if (it1 != m_subs.end())
desc += m_op == OP_OR ? "OR ": "AND ";
}
break;
}
if (desc[desc.length() - 1] == ' ')
desc.erase(desc.length() - 1);
desc += ")";
if (m_modifiers != 0) {
if (m_modifiers & WQM_BOOST) desc += "BOOST|";
if (m_modifiers & WQM_CASESENS) desc += "CASESENS|";
if (m_modifiers & WQM_DIACSENS) desc += "DIACSENS|";
if (m_modifiers & WQM_FUZZY) desc += "FUZZY|";
if (m_modifiers & WQM_NOSTEM) desc += "NOSTEM|";
if (m_modifiers & WQM_PHRASESLACK) {
char buf[100];
sprintf(buf, "%d", m_slack);
desc += "PHRASESLACK(" + string(buf) + string(")|");
}
if (m_modifiers & WQM_PROX) desc += "PROX|";
if (m_modifiers & WQM_REGEX) desc += "REGEX|";
if (m_modifiers & WQM_SLOPPY) desc += "SLOPPY|";
if (m_modifiers & WQM_WORDS) desc += "WORDS|";
if (desc.length() > 0 && desc[desc.length()-1] == '|')
desc.erase(desc.length()-1);
}
desc += " ";
}
// The string query parser code:
/* Shamelessly lifted from Beagle:
* This is our regular Expression Pattern:
* we expect something like this:
* -key:"Value String"modifiers
* key:Value
* or
* Value
*/
/* The master regular expression used to parse a query string
* Sub-expressions in parenthesis are numbered from 1. Each opening
* parenthesis increases the index, but we're not interested in all
* Deviations from standard:
* Relation: the standard-conformant line read as (release<1.16):
"(:|=|<|>|<=|>=)" //7 Relation
but we are not actually making use of the relation type
(interpreting all as ":"), and this can product unexpected results
as a (ie pasted) search for nonexfield=value will silently drop
the nonexfield part, while the user probably was not aware of
triggering a field search (expecting just ':' to do this).
*/
static const char * parserExpr =
"(OR|\\|\\|)[[:space:]]*" //1 OR,||
"|"
"(AND|&&)[[:space:]]*" // 2 AND,&& (ignored, default)
"|"
"(" //3
"([+-])?" //4 Force or exclude indicator
"(" //5
"([[:alpha:]][[:alnum:]:]*)" //6 Field spec: ie: "dc:title:letitre"
"[[:space:]]*"
"(:|=|>|<)" //7 Relation
"[[:space:]]*)?"
"(" //8
"(\"" //9
"([^\"]+)" //10 "A quoted term"
"\")"
"([bcCdDeflLoprsw.0-9]*)" //11 modifiers
"|"
"([^[:space:]\"]+)" //12 ANormalTerm
")"
")[[:space:]]*"
;
// For debugging the parser. But see also NMATCH
static const char *matchNames[] = {
/* 0*/ "",
/* 1*/ "OR",
/* 2*/ "AND",
/* 3*/ "",
/* 4*/ "+-",
/* 5*/ "",
/* 6*/ "FIELD",
/* 7*/ "RELATION",
/* 8*/ "",
/* 9*/ "",
/*10*/ "QUOTEDTERM",
/*11*/ "MODIFIERS",
/*12*/ "TERM",
};
#define NMATCH (sizeof(matchNames) / sizeof(char *))
// Symbolic names for the interesting submatch indices
enum SbMatchIdx {SMI_OR=1, SMI_AND=2, SMI_PM=4, SMI_FIELD=6, SMI_REL=7,
SMI_QUOTED=10, SMI_MODIF=11, SMI_TERM=12};
static const int maxmatchlen = 1024;
static const int errbuflen = 300;
class StringToWasaQuery::Internal {
public:
Internal()
: m_rxneedsfree(false)
{}
~Internal()
{
if (m_rxneedsfree)
regfree(&m_rx);
}
bool checkSubMatch(int i, char *match, string& reason)
{
if (i < 0 || i >= int(NMATCH) || m_pmatch[i].rm_so == -1) {
//DPRINT((stderr, "checkSubMatch: no match: i %d rm_so %d\n",
//i, m_pmatch[i].rm_so));
return false;
}
if (m_pmatch[i].rm_eo - m_pmatch[i].rm_so <= 0) {
// weird and fatal
reason = "Internal regular expression handling error";
return false;
}
//DPRINT((stderr, "checkSubMatch: so %d eo %d\n", m_pmatch[i].rm_so,
//m_pmatch[i].rm_eo));
memcpy(match, m_cp + m_pmatch[i].rm_so,
m_pmatch[i].rm_eo - m_pmatch[i].rm_so);
match[m_pmatch[i].rm_eo - m_pmatch[i].rm_so] = 0;
return true;
}
WasaQuery *stringToQuery(const string& str, string& reason);
friend class StringToWasaQuery;
private:
const char *m_cp;
regex_t m_rx;
bool m_rxneedsfree;
regmatch_t m_pmatch[NMATCH];
};
StringToWasaQuery::StringToWasaQuery()
: internal(new Internal)
{
}
StringToWasaQuery::~StringToWasaQuery()
{
delete internal;
}
WasaQuery *
StringToWasaQuery::stringToQuery(const string& str, string& reason)
{
if (internal == 0)
return 0;
WasaQuery *wq = internal->stringToQuery(str, reason);
DUMPQ(wq);
return wq;
}
WasaQuery *
StringToWasaQuery::Internal::stringToQuery(const string& str, string& reason)
{
if (m_rxneedsfree)
regfree(&m_rx);
char errbuf[errbuflen+1];
int errcode;
if ((errcode = regcomp(&m_rx, parserExpr, REG_EXTENDED)) != 0) {
regerror(errcode, &m_rx, errbuf, errbuflen);
reason = errbuf;
return 0;
}
m_rxneedsfree = true;
const char *cpe;
m_cp = str.c_str();
cpe = str.c_str() + str.length();
WasaQuery *query = new WasaQuery;
query->m_op = WasaQuery::OP_AND;
WasaQuery *orChain = 0;
bool prev_or = false;
// Loop on repeated regexp matches on the main string.
for (int loop = 0;;loop++) {
if ((errcode = regexec(&m_rx, m_cp, NMATCH, m_pmatch, 0))) {
regerror(errcode, &m_rx, errbuf, errbuflen);
reason = errbuf;
return 0;
}
if (m_pmatch[0].rm_eo <= 0) {
// weird and fatal
reason = "Internal regular expression handling error";
return 0;
}
#ifdef DEB_WASASTRINGTOQ
DPRINT((stderr, "Next part:\n"));
for (unsigned int i = 0; i < NMATCH; i++) {
if (m_pmatch[i].rm_so == -1) continue;
char match[maxmatchlen+1];
memcpy(match, m_cp + m_pmatch[i].rm_so,
m_pmatch[i].rm_eo - m_pmatch[i].rm_so);
match[m_pmatch[i].rm_eo - m_pmatch[i].rm_so] = 0;
if (matchNames[i][0])
DPRINT((stderr, "%10s: [%s] (%d->%d)\n", matchNames[i], match,
(int)m_pmatch[i].rm_so, (int)m_pmatch[i].rm_eo));
}
#endif
char match[maxmatchlen+1];
if (checkSubMatch(SMI_OR, match, reason)) {
if (prev_or) {
// Bad syntax
reason = "Bad syntax: consecutive OR";
return 0;
}
if (orChain == 0) {
// Fist OR seen: start OR subclause.
if ((orChain = new WasaQuery()) == 0) {
reason = "Out of memory";
return 0;
}
orChain->m_op = WasaQuery::OP_OR;
}
// For the first OR, we need to transfer the previous
// query from the main vector to the OR subquery
if (orChain->m_subs.empty() && !query->m_subs.empty()) {
orChain->m_subs.push_back(query->m_subs.back());
query->m_subs.pop_back();
}
prev_or = true;
} else if (checkSubMatch(SMI_AND, match, reason)) {
// Do nothing, AND is the default. We might want to check for
// errors like consecutive ANDs, or OR AND
} else {
WasaQuery *nclause = new WasaQuery;
if (nclause == 0) {
reason = "Out of memory";
return 0;
}
// Check for quoted or unquoted value
unsigned int mods = 0;
if (checkSubMatch(SMI_QUOTED, match, reason)) {
nclause->m_value = match;
} else if (checkSubMatch(SMI_TERM, match, reason)) {
nclause->m_value = match;
}
if (nclause->m_value.empty()) {
// Isolated +- or fieldname: without a value. Ignore until
// told otherwise.
DPRINT((stderr, "Clause with empty value, skipping\n"));
delete nclause;
goto nextfield;
}
if (checkSubMatch(SMI_MODIF, match, reason)) {
DPRINT((stderr, "Got modifiers: [%s]\n", match));
for (unsigned int i = 0; i < strlen(match); i++) {
switch (match[i]) {
case 'b':
mods |= WasaQuery::WQM_BOOST;
nclause->m_weight = 10.0;
break;
case 'c': break;
case 'C': mods |= WasaQuery::WQM_CASESENS; break;
case 'd': break;
case 'D': mods |= WasaQuery::WQM_DIACSENS; break;
case 'e': mods |= WasaQuery::WQM_CASESENS |
WasaQuery::WQM_DIACSENS |
WasaQuery::WQM_NOSTEM;
break;
case 'f': mods |= WasaQuery::WQM_FUZZY; break;
case 'l': mods |= WasaQuery::WQM_NOSTEM; break;
case 'L': break;
case 'o':
mods |= WasaQuery::WQM_PHRASESLACK;
// Default slack if specified only by 'o' is 10.
nclause->m_slack = 10;
if (i < strlen(match) - 1) {
char *endptr;
int slack = strtol(match+i+1, &endptr, 10);
if (endptr != match+i+1) {
i += endptr - (match+i+1);
nclause->m_slack = slack;
}
}
break;
case 'p':
mods |= WasaQuery::WQM_PROX;
nclause->m_slack = 10;
break;
case 'r': mods |= WasaQuery::WQM_REGEX; break;
case 's': mods |= WasaQuery::WQM_SLOPPY; break;
case 'w': mods |= WasaQuery::WQM_WORDS; break;
case '.':case '0':case '1':case '2':case '3':case '4':
case '5':case '6':case '7':case '8':case '9':
{
int n;
float factor;
if (sscanf(match+i, "%f %n", &factor, &n)) {
nclause->m_weight = factor;
DPRINT((stderr, "Got factor %.2f len %d\n",
factor, n));
}
if (n)
i += n-1;
}
}
}
}
nclause->m_modifiers = WasaQuery::Modifier(mods);
// Field indicator ?
if (checkSubMatch(SMI_FIELD, match, reason)) {
// We used Check for special fields indicating sorting
// etc. here but this went away from the spec. See 1.4
// if it comes back
nclause->m_fieldspec = match;
if (checkSubMatch(SMI_REL, match, reason)) {
switch (match[0]) {
case '=':nclause->m_rel = WasaQuery::REL_EQUALS;break;
case ':':nclause->m_rel = WasaQuery::REL_CONTAINS;break;
case '<':
if (match[1] == '=')
nclause->m_rel = WasaQuery::REL_LTE;
else
nclause->m_rel = WasaQuery::REL_LT;
break;
case '>':
if (match[1] == '=')
nclause->m_rel = WasaQuery::REL_GTE;
else
nclause->m_rel = WasaQuery::REL_GT;
break;
default:
nclause->m_rel = WasaQuery::REL_CONTAINS;
}
} else {
// ?? If field matched we should have a relation
nclause->m_rel = WasaQuery::REL_CONTAINS;
}
}
// +- indicator ?
if (checkSubMatch(SMI_PM, match, reason) && match[0] == '-') {
nclause->m_op = WasaQuery::OP_EXCL;
} else {
nclause->m_op = WasaQuery::OP_LEAF;
}
if (prev_or) {
// The precedent token was an OR, add new clause to or chain
//DPRINT((stderr, "Adding to OR chain\n"));
orChain->m_subs.push_back(nclause);
} else {
if (orChain) {
// Getting out of OR. Add the OR subquery to the main one
//DPRINT((stderr, "Adding OR chain to main\n"));
query->m_subs.push_back(orChain);
orChain = 0;
}
//DPRINT((stderr, "Adding to main chain\n"));
// Add new clause to main query
query->m_subs.push_back(nclause);
}
prev_or = false;
}
nextfield:
// Advance current string position. We checked earlier that
// the increment is strictly positive, so we won't loop
// forever
m_cp += m_pmatch[0].rm_eo;
if (m_cp >= cpe)
break;
}
if (orChain) {
// Getting out of OR. Add the OR subquery to the main one
DPRINT((stderr, "Adding OR chain to main.Before: \n"));
DUMPQ(query);
DUMPQ(orChain);
query->m_subs.push_back(orChain);
}
regfree(&m_rx);
m_rxneedsfree = false;
return query;
}
#else // TEST
#include <stdio.h>
#include <stdlib.h>
#include "wasastringtoquery.h"
static char *thisprog;
int main(int argc, char **argv)
{
thisprog = argv[0];
argc--; argv++;
if (argc != 1) {
fprintf(stderr, "need one arg\n");
exit(1);
}
const string str = *argv++;argc--;
string reason;
StringToWasaQuery qparser;
WasaQuery *q = qparser.stringToQuery(str, reason);
if (q == 0) {
fprintf(stderr, "stringToQuery failed: %s\n", reason.c_str());
exit(1);
}
string desc;
q->describe(desc);
fprintf(stderr, "Finally: %s\n", desc.c_str());
exit(0);
}
#endif // TEST_WASASTRINGTOQUERY