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wparser.c
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1 /*-------------------------------------------------------------------------
2  *
3  * wparser.c
4  * Standard interface to word parser
5  *
6  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
7  *
8  *
9  * IDENTIFICATION
10  * src/backend/tsearch/wparser.c
11  *
12  *-------------------------------------------------------------------------
13  */
14 #include "postgres.h"
15 
16 #include "funcapi.h"
17 #include "catalog/namespace.h"
18 #include "catalog/pg_type.h"
19 #include "commands/defrem.h"
20 #include "tsearch/ts_cache.h"
21 #include "tsearch/ts_utils.h"
22 #include "utils/builtins.h"
23 #include "utils/jsonapi.h"
24 #include "utils/varlena.h"
25 
26 
27 /******sql-level interface******/
28 
29 typedef struct
30 {
31  int cur;
34 
35 /* state for ts_headline_json_* */
36 typedef struct HeadlineJsonState
37 {
45 
46 static text * headline_json_value(void *_state, char *elem_value, int elem_len);
47 
48 static void
50 {
51  TupleDesc tupdesc;
52  MemoryContext oldcontext;
55 
56  if (!OidIsValid(prs->lextypeOid))
57  elog(ERROR, "method lextype isn't defined for text search parser %u",
58  prsid);
59 
60  oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
61 
63  st->cur = 0;
64  /* lextype takes one dummy argument */
66  (Datum) 0));
67  funcctx->user_fctx = (void *) st;
68 
69  tupdesc = CreateTemplateTupleDesc(3, false);
70  TupleDescInitEntry(tupdesc, (AttrNumber) 1, "tokid",
71  INT4OID, -1, 0);
72  TupleDescInitEntry(tupdesc, (AttrNumber) 2, "alias",
73  TEXTOID, -1, 0);
74  TupleDescInitEntry(tupdesc, (AttrNumber) 3, "description",
75  TEXTOID, -1, 0);
76 
77  funcctx->attinmeta = TupleDescGetAttInMetadata(tupdesc);
78  MemoryContextSwitchTo(oldcontext);
79 }
80 
81 static Datum
83 {
85 
86  st = (TSTokenTypeStorage *) funcctx->user_fctx;
87  if (st->list && st->list[st->cur].lexid)
88  {
89  Datum result;
90  char *values[3];
91  char txtid[16];
92  HeapTuple tuple;
93 
94  sprintf(txtid, "%d", st->list[st->cur].lexid);
95  values[0] = txtid;
96  values[1] = st->list[st->cur].alias;
97  values[2] = st->list[st->cur].descr;
98 
99  tuple = BuildTupleFromCStrings(funcctx->attinmeta, values);
100  result = HeapTupleGetDatum(tuple);
101 
102  pfree(values[1]);
103  pfree(values[2]);
104  st->cur++;
105  return result;
106  }
107  if (st->list)
108  pfree(st->list);
109  pfree(st);
110  return (Datum) 0;
111 }
112 
113 Datum
115 {
116  FuncCallContext *funcctx;
117  Datum result;
118 
119  if (SRF_IS_FIRSTCALL())
120  {
121  funcctx = SRF_FIRSTCALL_INIT();
122  tt_setup_firstcall(funcctx, PG_GETARG_OID(0));
123  }
124 
125  funcctx = SRF_PERCALL_SETUP();
126 
127  if ((result = tt_process_call(funcctx)) != (Datum) 0)
128  SRF_RETURN_NEXT(funcctx, result);
129  SRF_RETURN_DONE(funcctx);
130 }
131 
132 Datum
134 {
135  FuncCallContext *funcctx;
136  Datum result;
137 
138  if (SRF_IS_FIRSTCALL())
139  {
140  text *prsname = PG_GETARG_TEXT_PP(0);
141  Oid prsId;
142 
143  funcctx = SRF_FIRSTCALL_INIT();
144  prsId = get_ts_parser_oid(textToQualifiedNameList(prsname), false);
145  tt_setup_firstcall(funcctx, prsId);
146  }
147 
148  funcctx = SRF_PERCALL_SETUP();
149 
150  if ((result = tt_process_call(funcctx)) != (Datum) 0)
151  SRF_RETURN_NEXT(funcctx, result);
152  SRF_RETURN_DONE(funcctx);
153 }
154 
155 typedef struct
156 {
157  int type;
158  char *lexeme;
159 } LexemeEntry;
160 
161 typedef struct
162 {
163  int cur;
164  int len;
166 } PrsStorage;
167 
168 
169 static void
171 {
172  TupleDesc tupdesc;
173  MemoryContext oldcontext;
174  PrsStorage *st;
176  char *lex = NULL;
177  int llen = 0,
178  type = 0;
179  void *prsdata;
180 
181  oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
182 
183  st = (PrsStorage *) palloc(sizeof(PrsStorage));
184  st->cur = 0;
185  st->len = 16;
186  st->list = (LexemeEntry *) palloc(sizeof(LexemeEntry) * st->len);
187 
188  prsdata = (void *) DatumGetPointer(FunctionCall2(&prs->prsstart,
191 
192  while ((type = DatumGetInt32(FunctionCall3(&prs->prstoken,
193  PointerGetDatum(prsdata),
194  PointerGetDatum(&lex),
195  PointerGetDatum(&llen)))) != 0)
196  {
197  if (st->cur >= st->len)
198  {
199  st->len = 2 * st->len;
200  st->list = (LexemeEntry *) repalloc(st->list, sizeof(LexemeEntry) * st->len);
201  }
202  st->list[st->cur].lexeme = palloc(llen + 1);
203  memcpy(st->list[st->cur].lexeme, lex, llen);
204  st->list[st->cur].lexeme[llen] = '\0';
205  st->list[st->cur].type = type;
206  st->cur++;
207  }
208 
209  FunctionCall1(&prs->prsend, PointerGetDatum(prsdata));
210 
211  st->len = st->cur;
212  st->cur = 0;
213 
214  funcctx->user_fctx = (void *) st;
215  tupdesc = CreateTemplateTupleDesc(2, false);
216  TupleDescInitEntry(tupdesc, (AttrNumber) 1, "tokid",
217  INT4OID, -1, 0);
218  TupleDescInitEntry(tupdesc, (AttrNumber) 2, "token",
219  TEXTOID, -1, 0);
220 
221  funcctx->attinmeta = TupleDescGetAttInMetadata(tupdesc);
222  MemoryContextSwitchTo(oldcontext);
223 }
224 
225 static Datum
227 {
228  PrsStorage *st;
229 
230  st = (PrsStorage *) funcctx->user_fctx;
231  if (st->cur < st->len)
232  {
233  Datum result;
234  char *values[2];
235  char tid[16];
236  HeapTuple tuple;
237 
238  values[0] = tid;
239  sprintf(tid, "%d", st->list[st->cur].type);
240  values[1] = st->list[st->cur].lexeme;
241  tuple = BuildTupleFromCStrings(funcctx->attinmeta, values);
242  result = HeapTupleGetDatum(tuple);
243 
244  pfree(values[1]);
245  st->cur++;
246  return result;
247  }
248  else
249  {
250  if (st->list)
251  pfree(st->list);
252  pfree(st);
253  }
254  return (Datum) 0;
255 }
256 
257 Datum
259 {
260  FuncCallContext *funcctx;
261  Datum result;
262 
263  if (SRF_IS_FIRSTCALL())
264  {
265  text *txt = PG_GETARG_TEXT_PP(1);
266 
267  funcctx = SRF_FIRSTCALL_INIT();
268  prs_setup_firstcall(funcctx, PG_GETARG_OID(0), txt);
269  PG_FREE_IF_COPY(txt, 1);
270  }
271 
272  funcctx = SRF_PERCALL_SETUP();
273 
274  if ((result = prs_process_call(funcctx)) != (Datum) 0)
275  SRF_RETURN_NEXT(funcctx, result);
276  SRF_RETURN_DONE(funcctx);
277 }
278 
279 Datum
281 {
282  FuncCallContext *funcctx;
283  Datum result;
284 
285  if (SRF_IS_FIRSTCALL())
286  {
287  text *prsname = PG_GETARG_TEXT_PP(0);
288  text *txt = PG_GETARG_TEXT_PP(1);
289  Oid prsId;
290 
291  funcctx = SRF_FIRSTCALL_INIT();
292  prsId = get_ts_parser_oid(textToQualifiedNameList(prsname), false);
293  prs_setup_firstcall(funcctx, prsId, txt);
294  }
295 
296  funcctx = SRF_PERCALL_SETUP();
297 
298  if ((result = prs_process_call(funcctx)) != (Datum) 0)
299  SRF_RETURN_NEXT(funcctx, result);
300  SRF_RETURN_DONE(funcctx);
301 }
302 
303 Datum
305 {
306  text *in = PG_GETARG_TEXT_PP(1);
307  TSQuery query = PG_GETARG_TSQUERY(2);
308  text *opt = (PG_NARGS() > 3 && PG_GETARG_POINTER(3)) ? PG_GETARG_TEXT_PP(3) : NULL;
309  HeadlineParsedText prs;
310  List *prsoptions;
311  text *out;
312  TSConfigCacheEntry *cfg;
313  TSParserCacheEntry *prsobj;
314 
316  prsobj = lookup_ts_parser_cache(cfg->prsId);
317 
318  if (!OidIsValid(prsobj->headlineOid))
319  ereport(ERROR,
320  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
321  errmsg("text search parser does not support headline creation")));
322 
323  memset(&prs, 0, sizeof(HeadlineParsedText));
324  prs.lenwords = 32;
325  prs.words = (HeadlineWordEntry *) palloc(sizeof(HeadlineWordEntry) * prs.lenwords);
326 
327  hlparsetext(cfg->cfgId, &prs, query,
328  VARDATA_ANY(in), VARSIZE_ANY_EXHDR(in));
329 
330  if (opt)
331  prsoptions = deserialize_deflist(PointerGetDatum(opt));
332  else
333  prsoptions = NIL;
334 
335  FunctionCall3(&(prsobj->prsheadline),
336  PointerGetDatum(&prs),
337  PointerGetDatum(prsoptions),
338  PointerGetDatum(query));
339 
340  out = generateHeadline(&prs);
341 
342  PG_FREE_IF_COPY(in, 1);
343  PG_FREE_IF_COPY(query, 2);
344  if (opt)
345  PG_FREE_IF_COPY(opt, 3);
346  pfree(prs.words);
347  pfree(prs.startsel);
348  pfree(prs.stopsel);
349 
350  PG_RETURN_POINTER(out);
351 }
352 
353 Datum
355 {
357  PG_GETARG_DATUM(0),
358  PG_GETARG_DATUM(1),
359  PG_GETARG_DATUM(2)));
360 }
361 
362 Datum
364 {
367  PG_GETARG_DATUM(0),
368  PG_GETARG_DATUM(1)));
369 }
370 
371 Datum
373 {
376  PG_GETARG_DATUM(0),
377  PG_GETARG_DATUM(1),
378  PG_GETARG_DATUM(2)));
379 }
380 
381 Datum
383 {
384  Jsonb *out, *jb = PG_GETARG_JSONB(1);
385  TSQuery query = PG_GETARG_TSQUERY(2);
386  text *opt = (PG_NARGS() > 3 && PG_GETARG_POINTER(3)) ? PG_GETARG_TEXT_P(3) : NULL;
388 
389  HeadlineParsedText prs;
391 
392  memset(&prs, 0, sizeof(HeadlineParsedText));
393  prs.lenwords = 32;
394  prs.words = (HeadlineWordEntry *) palloc(sizeof(HeadlineWordEntry) * prs.lenwords);
395 
396  state->prs = &prs;
398  state->prsobj = lookup_ts_parser_cache(state->cfg->prsId);
399  state->query = query;
400  if (opt)
402  else
403  state->prsoptions = NIL;
404 
405  if (!OidIsValid(state->prsobj->headlineOid))
406  ereport(ERROR,
407  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
408  errmsg("text search parser does not support headline creation")));
409 
410  out = transform_jsonb_string_values(jb, state, action);
411 
412  PG_FREE_IF_COPY(jb, 1);
413  PG_FREE_IF_COPY(query, 2);
414  if (opt)
415  PG_FREE_IF_COPY(opt, 3);
416 
417  pfree(prs.words);
418 
419  if (state->transformed)
420  {
421  pfree(prs.startsel);
422  pfree(prs.stopsel);
423  }
424 
425  PG_RETURN_JSONB(out);
426 }
427 
428 Datum
430 {
433  PG_GETARG_DATUM(0),
434  PG_GETARG_DATUM(1)));
435 }
436 
437 Datum
439 {
441  PG_GETARG_DATUM(0),
442  PG_GETARG_DATUM(1),
443  PG_GETARG_DATUM(2)));
444 }
445 
446 Datum
448 {
451  PG_GETARG_DATUM(0),
452  PG_GETARG_DATUM(1),
453  PG_GETARG_DATUM(2)));
454 }
455 
456 Datum
458 {
459  text *json = PG_GETARG_TEXT_P(1);
460  TSQuery query = PG_GETARG_TSQUERY(2);
461  text *opt = (PG_NARGS() > 3 && PG_GETARG_POINTER(3)) ? PG_GETARG_TEXT_P(3) : NULL;
462  text *out;
464 
465  HeadlineParsedText prs;
467 
468  memset(&prs, 0, sizeof(HeadlineParsedText));
469  prs.lenwords = 32;
470  prs.words = (HeadlineWordEntry *) palloc(sizeof(HeadlineWordEntry) * prs.lenwords);
471 
472  state->prs = &prs;
474  state->prsobj = lookup_ts_parser_cache(state->cfg->prsId);
475  state->query = query;
476  if (opt)
478  else
479  state->prsoptions = NIL;
480 
481  if (!OidIsValid(state->prsobj->headlineOid))
482  ereport(ERROR,
483  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
484  errmsg("text search parser does not support headline creation")));
485 
486  out = transform_json_string_values(json, state, action);
487 
488  PG_FREE_IF_COPY(json, 1);
489  PG_FREE_IF_COPY(query, 2);
490  if (opt)
491  PG_FREE_IF_COPY(opt, 3);
492  pfree(prs.words);
493 
494  if (state->transformed)
495  {
496  pfree(prs.startsel);
497  pfree(prs.stopsel);
498  }
499 
500  PG_RETURN_TEXT_P(out);
501 }
502 
503 Datum
505 {
508  PG_GETARG_DATUM(0),
509  PG_GETARG_DATUM(1)));
510 }
511 
512 Datum
514 {
516  PG_GETARG_DATUM(0),
517  PG_GETARG_DATUM(1),
518  PG_GETARG_DATUM(2)));
519 }
520 
521 Datum
523 {
526  PG_GETARG_DATUM(0),
527  PG_GETARG_DATUM(1),
528  PG_GETARG_DATUM(2)));
529 }
530 
531 
532 /*
533  * Return headline in text from, generated from a json(b) element
534  */
535 static text *
536 headline_json_value(void *_state, char *elem_value, int elem_len)
537 {
539 
540  HeadlineParsedText *prs = state->prs;
541  TSConfigCacheEntry *cfg = state->cfg;
542  TSParserCacheEntry *prsobj = state->prsobj;
543  TSQuery query = state->query;
544  List *prsoptions = state->prsoptions;
545 
546  prs->curwords = 0;
547  hlparsetext(cfg->cfgId, prs, query, elem_value, elem_len);
548  FunctionCall3(&(prsobj->prsheadline),
549  PointerGetDatum(prs),
550  PointerGetDatum(prsoptions),
551  PointerGetDatum(query));
552 
553  state->transformed = true;
554  return generateHeadline(prs);
555 }
#define PG_RETURN_POINTER(x)
Definition: fmgr.h:321
#define NIL
Definition: pg_list.h:69
struct HeadlineJsonState HeadlineJsonState
static Datum prs_process_call(FuncCallContext *funcctx)
Definition: wparser.c:226
#define VARDATA_ANY(PTR)
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int type
Definition: wparser.c:157
Datum ts_headline_byid(PG_FUNCTION_ARGS)
Definition: wparser.c:354
Datum ts_headline_jsonb_opt(PG_FUNCTION_ARGS)
Definition: wparser.c:447
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Definition: wparser.c:32
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Definition: wparser.c:165
#define TEXTOID
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TSParserCacheEntry * prsobj
Definition: wparser.c:40
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#define PG_GETARG_DATUM(n)
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#define PG_GETARG_TSQUERY(n)
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Definition: formatting.c:1618
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Definition: jsonb.h:71
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Definition: tupdesc.c:497
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FmgrInfo prsheadline
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