mirror of
https://github.com/postgres/postgres.git
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330 lines
6.7 KiB
C
330 lines
6.7 KiB
C
/*
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* Operations for tsvector type
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* Teodor Sigaev <teodor@sigaev.ru>
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*/
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#include "postgres.h"
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#include "access/gist.h"
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#include "access/itup.h"
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#include "utils/builtins.h"
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#include "storage/bufpage.h"
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#include "executor/spi.h"
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#include "commands/trigger.h"
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#include "nodes/pg_list.h"
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#include "catalog/namespace.h"
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#include "utils/pg_locale.h"
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#include <ctype.h> /* tolower */
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#include "tsvector.h"
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#include "query.h"
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#include "ts_cfg.h"
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#include "common.h"
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PG_FUNCTION_INFO_V1(strip);
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Datum strip(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(setweight);
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Datum setweight(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(concat);
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Datum concat(PG_FUNCTION_ARGS);
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Datum
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strip(PG_FUNCTION_ARGS)
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{
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tsvector *in = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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tsvector *out;
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int i,
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len = 0;
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WordEntry *arrin = ARRPTR(in),
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*arrout;
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char *cur;
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for (i = 0; i < in->size; i++)
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len += SHORTALIGN(arrin[i].len);
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len = CALCDATASIZE(in->size, len);
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out = (tsvector *) palloc(len);
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memset(out, 0, len);
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out->len = len;
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out->size = in->size;
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arrout = ARRPTR(out);
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cur = STRPTR(out);
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for (i = 0; i < in->size; i++)
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{
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memcpy(cur, STRPTR(in) + arrin[i].pos, arrin[i].len);
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arrout[i].haspos = 0;
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arrout[i].len = arrin[i].len;
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arrout[i].pos = cur - STRPTR(out);
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cur += SHORTALIGN(arrout[i].len);
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}
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PG_FREE_IF_COPY(in, 0);
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PG_RETURN_POINTER(out);
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}
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Datum
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setweight(PG_FUNCTION_ARGS)
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{
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tsvector *in = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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char cw = PG_GETARG_CHAR(1);
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tsvector *out;
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int i,
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j;
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WordEntry *entry;
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WordEntryPos *p;
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int w = 0;
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switch (tolower(cw))
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{
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case 'a':
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w = 3;
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break;
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case 'b':
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w = 2;
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break;
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case 'c':
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w = 1;
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break;
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case 'd':
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w = 0;
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break;
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/* internal error */
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default:
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elog(ERROR, "unrecognized weight");
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}
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out = (tsvector *) palloc(in->len);
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memcpy(out, in, in->len);
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entry = ARRPTR(out);
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i = out->size;
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while (i--)
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{
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if ((j = POSDATALEN(out, entry)) != 0)
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{
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p = POSDATAPTR(out, entry);
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while (j--)
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{
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WEP_SETWEIGHT(*p, w);
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p++;
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}
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}
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entry++;
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}
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PG_FREE_IF_COPY(in, 0);
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PG_RETURN_POINTER(out);
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}
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static int
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compareEntry(char *ptra, WordEntry * a, char *ptrb, WordEntry * b)
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{
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if (a->len == b->len)
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{
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return strncmp(
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ptra + a->pos,
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ptrb + b->pos,
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a->len);
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}
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return (a->len > b->len) ? 1 : -1;
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}
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static int4
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add_pos(tsvector * src, WordEntry * srcptr, tsvector * dest, WordEntry * destptr, int4 maxpos)
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{
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uint16 *clen = (uint16 *) _POSDATAPTR(dest, destptr);
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int i;
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uint16 slen = POSDATALEN(src, srcptr),
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startlen;
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WordEntryPos *spos = POSDATAPTR(src, srcptr),
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*dpos = POSDATAPTR(dest, destptr);
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if (!destptr->haspos)
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*clen = 0;
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startlen = *clen;
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for (i = 0; i < slen && *clen < MAXNUMPOS && (*clen == 0 || WEP_GETPOS(dpos[*clen - 1]) != MAXENTRYPOS - 1); i++)
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{
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WEP_SETWEIGHT(dpos[*clen], WEP_GETWEIGHT(spos[i]));
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WEP_SETPOS(dpos[*clen], LIMITPOS(WEP_GETPOS(spos[i]) + maxpos));
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(*clen)++;
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}
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if (*clen != startlen)
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destptr->haspos = 1;
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return *clen - startlen;
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}
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Datum
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concat(PG_FUNCTION_ARGS)
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{
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tsvector *in1 = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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tsvector *in2 = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
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tsvector *out;
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WordEntry *ptr;
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WordEntry *ptr1,
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*ptr2;
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WordEntryPos *p;
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int maxpos = 0,
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i,
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j,
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i1,
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i2;
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char *cur;
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char *data,
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*data1,
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*data2;
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ptr = ARRPTR(in1);
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i = in1->size;
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while (i--)
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{
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if ((j = POSDATALEN(in1, ptr)) != 0)
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{
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p = POSDATAPTR(in1, ptr);
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while (j--)
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{
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if (WEP_GETPOS(*p) > maxpos)
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maxpos = WEP_GETPOS(*p);
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p++;
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}
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}
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ptr++;
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}
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ptr1 = ARRPTR(in1);
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ptr2 = ARRPTR(in2);
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data1 = STRPTR(in1);
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data2 = STRPTR(in2);
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i1 = in1->size;
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i2 = in2->size;
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out = (tsvector *) palloc(in1->len + in2->len);
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memset(out, 0, in1->len + in2->len);
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out->len = in1->len + in2->len;
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out->size = in1->size + in2->size;
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data = cur = STRPTR(out);
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ptr = ARRPTR(out);
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while (i1 && i2)
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{
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int cmp = compareEntry(data1, ptr1, data2, ptr2);
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if (cmp < 0)
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{ /* in1 first */
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ptr->haspos = ptr1->haspos;
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ptr->len = ptr1->len;
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memcpy(cur, data1 + ptr1->pos, ptr1->len);
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ptr->pos = cur - data;
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cur += SHORTALIGN(ptr1->len);
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if (ptr->haspos)
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{
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memcpy(cur, _POSDATAPTR(in1, ptr1), POSDATALEN(in1, ptr1) * sizeof(WordEntryPos) + sizeof(uint16));
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cur += POSDATALEN(in1, ptr1) * sizeof(WordEntryPos) + sizeof(uint16);
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}
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ptr++;
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ptr1++;
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i1--;
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}
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else if (cmp > 0)
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{ /* in2 first */
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ptr->haspos = ptr2->haspos;
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ptr->len = ptr2->len;
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memcpy(cur, data2 + ptr2->pos, ptr2->len);
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ptr->pos = cur - data;
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cur += SHORTALIGN(ptr2->len);
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if (ptr->haspos)
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{
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int addlen = add_pos(in2, ptr2, out, ptr, maxpos);
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if (addlen == 0)
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ptr->haspos = 0;
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else
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cur += addlen * sizeof(WordEntryPos) + sizeof(uint16);
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}
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ptr++;
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ptr2++;
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i2--;
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}
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else
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{
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ptr->haspos = ptr1->haspos | ptr2->haspos;
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ptr->len = ptr1->len;
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memcpy(cur, data1 + ptr1->pos, ptr1->len);
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ptr->pos = cur - data;
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cur += SHORTALIGN(ptr1->len);
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if (ptr->haspos)
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{
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if (ptr1->haspos)
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{
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memcpy(cur, _POSDATAPTR(in1, ptr1), POSDATALEN(in1, ptr1) * sizeof(WordEntryPos) + sizeof(uint16));
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cur += POSDATALEN(in1, ptr1) * sizeof(WordEntryPos) + sizeof(uint16);
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if (ptr2->haspos)
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cur += add_pos(in2, ptr2, out, ptr, maxpos) * sizeof(WordEntryPos);
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}
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else if (ptr2->haspos)
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{
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int addlen = add_pos(in2, ptr2, out, ptr, maxpos);
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if (addlen == 0)
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ptr->haspos = 0;
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else
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cur += addlen * sizeof(WordEntryPos) + sizeof(uint16);
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}
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}
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ptr++;
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ptr1++;
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ptr2++;
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i1--;
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i2--;
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}
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}
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while (i1)
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{
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ptr->haspos = ptr1->haspos;
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ptr->len = ptr1->len;
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memcpy(cur, data1 + ptr1->pos, ptr1->len);
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ptr->pos = cur - data;
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cur += SHORTALIGN(ptr1->len);
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if (ptr->haspos)
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{
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memcpy(cur, _POSDATAPTR(in1, ptr1), POSDATALEN(in1, ptr1) * sizeof(WordEntryPos) + sizeof(uint16));
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cur += POSDATALEN(in1, ptr1) * sizeof(WordEntryPos) + sizeof(uint16);
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}
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ptr++;
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ptr1++;
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i1--;
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}
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while (i2)
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{
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ptr->haspos = ptr2->haspos;
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ptr->len = ptr2->len;
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memcpy(cur, data2 + ptr2->pos, ptr2->len);
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ptr->pos = cur - data;
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cur += SHORTALIGN(ptr2->len);
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if (ptr->haspos)
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{
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int addlen = add_pos(in2, ptr2, out, ptr, maxpos);
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if (addlen == 0)
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ptr->haspos = 0;
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else
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cur += addlen * sizeof(WordEntryPos) + sizeof(uint16);
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}
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ptr++;
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ptr2++;
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i2--;
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}
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out->size = ptr - ARRPTR(out);
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out->len = CALCDATASIZE(out->size, cur - data);
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if (data != STRPTR(out))
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memmove(STRPTR(out), data, cur - data);
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PG_FREE_IF_COPY(in1, 0);
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PG_FREE_IF_COPY(in2, 1);
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PG_RETURN_POINTER(out);
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}
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