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postgresql/contrib/tsearch2/tsvector.c

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/*
* In/Out definitions for tsvector type
* Internal structure:
* string of values, array of position lexem in string and it's length
* Teodor Sigaev <teodor@sigaev.ru>
*/
#include "postgres.h"
#include "access/gist.h"
#include "access/itup.h"
#include "utils/builtins.h"
#include "storage/bufpage.h"
#include "executor/spi.h"
#include "commands/trigger.h"
#include "nodes/pg_list.h"
#include "catalog/namespace.h"
#include "utils/pg_locale.h"
#include <ctype.h> /* tolower */
#include "tsvector.h"
#include "query.h"
#include "ts_cfg.h"
#include "common.h"
PG_FUNCTION_INFO_V1(tsvector_in);
Datum tsvector_in(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(tsvector_out);
Datum tsvector_out(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(to_tsvector);
Datum to_tsvector(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(to_tsvector_current);
Datum to_tsvector_current(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(to_tsvector_name);
Datum to_tsvector_name(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(tsearch2);
Datum tsearch2(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(tsvector_length);
Datum tsvector_length(PG_FUNCTION_ARGS);
/*
* in/out text index type
*/
static int
comparePos(const void *a, const void *b) {
if ( ((WordEntryPos *) a)->pos == ((WordEntryPos *) b)->pos )
return 1;
return ( ((WordEntryPos *) a)->pos > ((WordEntryPos *) b)->pos ) ? 1 : -1;
}
static int
uniquePos(WordEntryPos *a, int4 l) {
WordEntryPos *ptr, *res;
res=a;
if (l==1)
return l;
qsort((void *) a, l, sizeof(WordEntryPos), comparePos);
ptr = a + 1;
while (ptr - a < l) {
if ( ptr->pos != res->pos ) {
res++;
res->pos = ptr->pos;
res->weight = ptr->weight;
if ( res-a >= MAXNUMPOS-1 || res->pos == MAXENTRYPOS-1 )
break;
} else if ( ptr->weight > res->weight )
res->weight = ptr->weight;
ptr++;
}
return res + 1 - a;
}
static char *BufferStr;
static int
compareentry(const void *a, const void *b)
{
if ( ((WordEntryIN *) a)->entry.len == ((WordEntryIN *) b)->entry.len)
{
return strncmp(
&BufferStr[((WordEntryIN *) a)->entry.pos],
&BufferStr[((WordEntryIN *) b)->entry.pos],
((WordEntryIN *) a)->entry.len);
}
return ( ((WordEntryIN *) a)->entry.len > ((WordEntryIN *) b)->entry.len ) ? 1 : -1;
}
static int
uniqueentry(WordEntryIN * a, int4 l, char *buf, int4 *outbuflen)
{
WordEntryIN *ptr,
*res;
res = a;
if (l == 1) {
if ( a->entry.haspos ) {
*(uint16*)(a->pos) = uniquePos( &(a->pos[1]), *(uint16*)(a->pos));
*outbuflen = SHORTALIGN(res->entry.len) + (*(uint16*)(a->pos) +1 )*sizeof(WordEntryPos);
}
return l;
}
ptr = a + 1;
BufferStr = buf;
qsort((void *) a, l, sizeof(WordEntryIN), compareentry);
while (ptr - a < l)
{
if (!(ptr->entry.len == res->entry.len &&
strncmp(&buf[ptr->entry.pos], &buf[res->entry.pos], res->entry.len) == 0))
{
if ( res->entry.haspos ) {
*(uint16*)(res->pos) = uniquePos( &(res->pos[1]), *(uint16*)(res->pos));
*outbuflen += *(uint16*)(res->pos) * sizeof(WordEntryPos);
}
*outbuflen += SHORTALIGN(res->entry.len);
res++;
memcpy(res,ptr,sizeof(WordEntryIN));
} else if ( ptr->entry.haspos ){
if ( res->entry.haspos ) {
int4 len=*(uint16*)(ptr->pos) + 1 + *(uint16*)(res->pos);
res->pos=(WordEntryPos*)repalloc( res->pos, len*sizeof(WordEntryPos));
memcpy( &(res->pos[ *(uint16*)(res->pos) + 1 ]),
&(ptr->pos[1]), *(uint16*)(ptr->pos) * sizeof(WordEntryPos));
*(uint16*)(res->pos) += *(uint16*)(ptr->pos);
pfree( ptr->pos );
} else {
res->entry.haspos=1;
res->pos = ptr->pos;
}
}
ptr++;
}
if ( res->entry.haspos ) {
*(uint16*)(res->pos) = uniquePos( &(res->pos[1]), *(uint16*)(res->pos));
*outbuflen += *(uint16*)(res->pos) * sizeof(WordEntryPos);
}
*outbuflen += SHORTALIGN(res->entry.len);
return res + 1 - a;
}
#define WAITWORD 1
#define WAITENDWORD 2
#define WAITNEXTCHAR 3
#define WAITENDCMPLX 4
#define WAITPOSINFO 5
#define INPOSINFO 6
#define WAITPOSDELIM 7
#define RESIZEPRSBUF \
do { \
if ( state->curpos - state->word + 1 >= state->len ) \
{ \
int4 clen = state->curpos - state->word; \
state->len *= 2; \
state->word = (char*)repalloc( (void*)state->word, state->len ); \
state->curpos = state->word + clen; \
} \
} while (0)
int4
gettoken_tsvector(TI_IN_STATE * state)
{
int4 oldstate = 0;
state->curpos = state->word;
state->state = WAITWORD;
state->alen=0;
while (1)
{
if (state->state == WAITWORD)
{
if (*(state->prsbuf) == '\0')
return 0;
else if (*(state->prsbuf) == '\'')
state->state = WAITENDCMPLX;
else if (*(state->prsbuf) == '\\')
{
state->state = WAITNEXTCHAR;
oldstate = WAITENDWORD;
}
else if (state->oprisdelim && ISOPERATOR(*(state->prsbuf)))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
else if (*(state->prsbuf) != ' ')
{
*(state->curpos) = *(state->prsbuf);
state->curpos++;
state->state = WAITENDWORD;
}
}
else if (state->state == WAITNEXTCHAR)
{
if (*(state->prsbuf) == '\0')
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("there is no escaped character")));
else
{
RESIZEPRSBUF;
*(state->curpos) = *(state->prsbuf);
state->curpos++;
state->state = oldstate;
}
}
else if (state->state == WAITENDWORD)
{
if (*(state->prsbuf) == '\\')
{
state->state = WAITNEXTCHAR;
oldstate = WAITENDWORD;
}
else if (*(state->prsbuf) == ' ' || *(state->prsbuf) == '\0' ||
(state->oprisdelim && ISOPERATOR(*(state->prsbuf))))
{
RESIZEPRSBUF;
if (state->curpos == state->word)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
*(state->curpos) = '\0';
return 1;
} else if ( *(state->prsbuf) == ':' ) {
if (state->curpos == state->word)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
*(state->curpos) = '\0';
if ( state->oprisdelim )
return 1;
else
state->state = INPOSINFO;
}
else
{
RESIZEPRSBUF;
*(state->curpos) = *(state->prsbuf);
state->curpos++;
}
}
else if (state->state == WAITENDCMPLX)
{
if (*(state->prsbuf) == '\'')
{
RESIZEPRSBUF;
*(state->curpos) = '\0';
if (state->curpos == state->word)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
if ( state->oprisdelim ) {
state->prsbuf++;
return 1;
} else
state->state = WAITPOSINFO;
}
else if (*(state->prsbuf) == '\\')
{
state->state = WAITNEXTCHAR;
oldstate = WAITENDCMPLX;
}
else if (*(state->prsbuf) == '\0')
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
else
{
RESIZEPRSBUF;
*(state->curpos) = *(state->prsbuf);
state->curpos++;
}
} else if (state->state == WAITPOSINFO) {
if ( *(state->prsbuf) == ':' )
state->state=INPOSINFO;
else
return 1;
} else if (state->state == INPOSINFO) {
if ( isdigit(*(state->prsbuf)) ) {
if ( state->alen==0 ) {
state->alen=4;
state->pos = (WordEntryPos*)palloc( sizeof(WordEntryPos)*state->alen );
*(uint16*)(state->pos)=0;
} else if ( *(uint16*)(state->pos) +1 >= state->alen ) {
state->alen *= 2;
state->pos = (WordEntryPos*)repalloc( state->pos, sizeof(WordEntryPos)*state->alen );
}
( *(uint16*)(state->pos) )++;
state->pos[ *(uint16*)(state->pos) ].pos = LIMITPOS(atoi(state->prsbuf));
if ( state->pos[ *(uint16*)(state->pos) ].pos == 0 )
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("wrong position info")));
state->pos[ *(uint16*)(state->pos) ].weight = 0;
state->state = WAITPOSDELIM;
} else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
} else if (state->state == WAITPOSDELIM) {
if ( *(state->prsbuf) == ',' ) {
state->state = INPOSINFO;
} else if ( tolower(*(state->prsbuf)) == 'a' || *(state->prsbuf)=='*' ) {
if ( state->pos[ *(uint16*)(state->pos) ].weight )
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
state->pos[ *(uint16*)(state->pos) ].weight = 3;
} else if ( tolower(*(state->prsbuf)) == 'b' ) {
if ( state->pos[ *(uint16*)(state->pos) ].weight )
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
state->pos[ *(uint16*)(state->pos) ].weight = 2;
} else if ( tolower(*(state->prsbuf)) == 'c' ) {
if ( state->pos[ *(uint16*)(state->pos) ].weight )
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
state->pos[ *(uint16*)(state->pos) ].weight = 1;
} else if ( tolower(*(state->prsbuf)) == 'd' ) {
if ( state->pos[ *(uint16*)(state->pos) ].weight )
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
state->pos[ *(uint16*)(state->pos) ].weight = 0;
} else if ( isspace(*(state->prsbuf)) || *(state->prsbuf) == '\0' ) {
return 1;
} else if ( !isdigit(*(state->prsbuf)) )
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error")));
} else
/* internal error */
elog(ERROR, "internal error");
state->prsbuf++;
}
return 0;
}
Datum
tsvector_in(PG_FUNCTION_ARGS)
{
char *buf = PG_GETARG_CSTRING(0);
TI_IN_STATE state;
WordEntryIN *arr;
WordEntry *inarr;
int4 len = 0,
totallen = 64;
tsvector *in;
char *tmpbuf,
*cur;
int4 i,
buflen = 256;
state.prsbuf = buf;
state.len = 32;
state.word = (char *) palloc(state.len);
state.oprisdelim = false;
arr = (WordEntryIN *) palloc(sizeof(WordEntryIN) * totallen);
cur = tmpbuf = (char *) palloc(buflen);
while (gettoken_tsvector(&state))
{
if (len >= totallen)
{
totallen *= 2;
arr = (WordEntryIN *) repalloc((void *) arr, sizeof(WordEntryIN) * totallen);
}
while ((cur - tmpbuf) + (state.curpos - state.word) >= buflen)
{
int4 dist = cur - tmpbuf;
buflen *= 2;
tmpbuf = (char *) repalloc((void *) tmpbuf, buflen);
cur = tmpbuf + dist;
}
if (state.curpos - state.word >= MAXSTRLEN)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("word is too long")));
arr[len].entry.len= state.curpos - state.word;
if (cur - tmpbuf > MAXSTRPOS)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("too long value")));
arr[len].entry.pos=cur - tmpbuf;
memcpy((void *) cur, (void *) state.word, arr[len].entry.len);
cur += arr[len].entry.len;
if ( state.alen ) {
arr[len].entry.haspos=1;
arr[len].pos = state.pos;
} else
arr[len].entry.haspos=0;
len++;
}
pfree(state.word);
if ( len > 0 )
len = uniqueentry(arr, len, tmpbuf, &buflen);
totallen = CALCDATASIZE(len, buflen);
in = (tsvector *) palloc(totallen);
memset(in,0,totallen);
in->len = totallen;
in->size = len;
cur = STRPTR(in);
inarr = ARRPTR(in);
for (i = 0; i < len; i++)
{
memcpy((void *) cur, (void *) &tmpbuf[arr[i].entry.pos], arr[i].entry.len);
arr[i].entry.pos=cur - STRPTR(in);
cur += SHORTALIGN(arr[i].entry.len);
if ( arr[i].entry.haspos ) {
memcpy( cur, arr[i].pos, (*(uint16*)arr[i].pos + 1) * sizeof(WordEntryPos));
cur += (*(uint16*)arr[i].pos + 1) * sizeof(WordEntryPos);
pfree( arr[i].pos );
}
memcpy( &(inarr[i]), &(arr[i].entry), sizeof(WordEntry) );
}
pfree(tmpbuf);
pfree(arr);
PG_RETURN_POINTER(in);
}
Datum
tsvector_length(PG_FUNCTION_ARGS)
{
tsvector *in = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
int4 ret = in->size;
PG_FREE_IF_COPY(in, 0);
PG_RETURN_INT32(ret);
}
Datum
tsvector_out(PG_FUNCTION_ARGS)
{
tsvector *out = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
char *outbuf;
int4 i,
j,
lenbuf = 0, pp;
WordEntry *ptr = ARRPTR(out);
char *curin,
*curout;
lenbuf=out->size * 2 /* '' */ + out->size - 1 /* space */ + 2 /*\0*/;
for (i = 0; i < out->size; i++) {
lenbuf += ptr[i].len*2 /*for escape */;
if ( ptr[i].haspos )
lenbuf += 7*POSDATALEN(out, &(ptr[i]));
}
curout = outbuf = (char *) palloc(lenbuf);
for (i = 0; i < out->size; i++)
{
curin = STRPTR(out)+ptr->pos;
if (i != 0)
*curout++ = ' ';
*curout++ = '\'';
j = ptr->len;
while (j--)
{
if (*curin == '\'')
{
int4 pos = curout - outbuf;
outbuf = (char *) repalloc((void *) outbuf, ++lenbuf);
curout = outbuf + pos;
*curout++ = '\\';
}
*curout++ = *curin++;
}
*curout++ = '\'';
if ( (pp=POSDATALEN(out,ptr)) != 0 ) {
WordEntryPos *wptr;
*curout++ = ':';
wptr=POSDATAPTR(out,ptr);
while(pp) {
sprintf(curout,"%d",wptr->pos);
curout=strchr(curout,'\0');
switch( wptr->weight ) {
case 3: *curout++ = 'A'; break;
case 2: *curout++ = 'B'; break;
case 1: *curout++ = 'C'; break;
case 0:
default: break;
}
if ( pp>1 ) *curout++ = ',';
pp--; wptr++;
}
}
ptr++;
}
*curout='\0';
outbuf[lenbuf - 1] = '\0';
PG_FREE_IF_COPY(out, 0);
PG_RETURN_POINTER(outbuf);
}
static int
compareWORD(const void *a, const void *b)
{
if (((WORD *) a)->len == ((WORD *) b)->len) {
int res = strncmp(
((WORD *) a)->word,
((WORD *) b)->word,
((WORD *) b)->len);
if ( res==0 )
return ( ((WORD *) a)->pos.pos > ((WORD *) b)->pos.pos ) ? 1 : -1;
return res;
}
return (((WORD *) a)->len > ((WORD *) b)->len) ? 1 : -1;
}
static int
uniqueWORD(WORD * a, int4 l)
{
WORD *ptr,
*res;
int tmppos;
if (l == 1) {
tmppos=LIMITPOS(a->pos.pos);
a->alen=2;
a->pos.apos=(uint16*)palloc( sizeof(uint16)*a->alen );
a->pos.apos[0]=1;
a->pos.apos[1]=tmppos;
return l;
}
res = a;
ptr = a + 1;
qsort((void *) a, l, sizeof(WORD), compareWORD);
tmppos=LIMITPOS(a->pos.pos);
a->alen=2;
a->pos.apos=(uint16*)palloc( sizeof(uint16)*a->alen );
a->pos.apos[0]=1;
a->pos.apos[1]=tmppos;
while (ptr - a < l)
{
if (!(ptr->len == res->len &&
strncmp(ptr->word, res->word, res->len) == 0))
{
res++;
res->len = ptr->len;
res->word = ptr->word;
tmppos=LIMITPOS(ptr->pos.pos);
res->alen=2;
res->pos.apos=(uint16*)palloc( sizeof(uint16)*res->alen );
res->pos.apos[0]=1;
res->pos.apos[1]=tmppos;
} else {
pfree(ptr->word);
if ( res->pos.apos[0] < MAXNUMPOS-1 && res->pos.apos[ res->pos.apos[0] ] != MAXENTRYPOS-1 ) {
if ( res->pos.apos[0]+1 >= res->alen ) {
res->alen*=2;
res->pos.apos=(uint16*)repalloc( res->pos.apos, sizeof(uint16)*res->alen );
}
res->pos.apos[ res->pos.apos[0]+1 ] = LIMITPOS(ptr->pos.pos);
res->pos.apos[0]++;
}
}
ptr++;
}
return res + 1 - a;
}
/*
* make value of tsvector
*/
static tsvector *
makevalue(PRSTEXT * prs)
{
int4 i,j,
lenstr = 0,
totallen;
tsvector *in;
WordEntry *ptr;
char *str,
*cur;
prs->curwords = uniqueWORD(prs->words, prs->curwords);
for (i = 0; i < prs->curwords; i++) {
lenstr += SHORTALIGN(prs->words[i].len);
if ( prs->words[i].alen )
lenstr += sizeof(uint16) + prs->words[i].pos.apos[0] * sizeof(WordEntryPos);
}
totallen = CALCDATASIZE(prs->curwords, lenstr);
in = (tsvector *) palloc(totallen);
memset(in,0,totallen);
in->len = totallen;
in->size = prs->curwords;
ptr = ARRPTR(in);
cur = str = STRPTR(in);
for (i = 0; i < prs->curwords; i++)
{
ptr->len = prs->words[i].len;
if (cur - str > MAXSTRPOS)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("value is too big")));
ptr->pos= cur - str;
memcpy((void *) cur, (void *) prs->words[i].word, prs->words[i].len);
pfree(prs->words[i].word);
cur += SHORTALIGN(prs->words[i].len);
if ( prs->words[i].alen ) {
WordEntryPos *wptr;
ptr->haspos=1;
*(uint16*)cur = prs->words[i].pos.apos[0];
wptr=POSDATAPTR(in,ptr);
for(j=0;j<*(uint16*)cur;j++) {
wptr[j].weight=0;
wptr[j].pos=prs->words[i].pos.apos[j+1];
}
cur += sizeof(uint16) + prs->words[i].pos.apos[0] * sizeof(WordEntryPos);
pfree(prs->words[i].pos.apos);
} else
ptr->haspos=0;
ptr++;
}
pfree(prs->words);
return in;
}
Datum
to_tsvector(PG_FUNCTION_ARGS)
{
text *in = PG_GETARG_TEXT_P(1);
PRSTEXT prs;
tsvector *out = NULL;
TSCfgInfo *cfg=findcfg(PG_GETARG_INT32(0));
prs.lenwords = 32;
prs.curwords = 0;
prs.pos = 0;
prs.words = (WORD *) palloc(sizeof(WORD) * prs.lenwords);
parsetext_v2(cfg, &prs, VARDATA(in), VARSIZE(in) - VARHDRSZ);
PG_FREE_IF_COPY(in, 1);
if (prs.curwords)
out = makevalue(&prs);
else {
pfree(prs.words);
out = palloc(CALCDATASIZE(0,0));
out->len = CALCDATASIZE(0,0);
out->size = 0;
}
PG_RETURN_POINTER(out);
}
Datum
to_tsvector_name(PG_FUNCTION_ARGS) {
text *cfg=PG_GETARG_TEXT_P(0);
Datum res = DirectFunctionCall3(
to_tsvector,
Int32GetDatum( name2id_cfg( cfg ) ),
PG_GETARG_DATUM(1),
(Datum)0
);
PG_FREE_IF_COPY(cfg,0);
PG_RETURN_DATUM(res);
}
Datum
to_tsvector_current(PG_FUNCTION_ARGS) {
Datum res = DirectFunctionCall3(
to_tsvector,
Int32GetDatum( get_currcfg() ),
PG_GETARG_DATUM(0),
(Datum)0
);
PG_RETURN_DATUM(res);
}
static Oid
findFunc(char *fname) {
FuncCandidateList clist,ptr;
Oid funcid = InvalidOid;
List *names=makeList1(makeString(fname));
ptr = clist = FuncnameGetCandidates(names, 1);
freeList(names);
if ( !ptr )
return funcid;
while(ptr) {
if ( ptr->args[0] == TEXTOID && funcid == InvalidOid )
funcid=ptr->oid;
clist=ptr->next;
pfree(ptr);
ptr=clist;
}
return funcid;
}
/*
* Trigger
*/
Datum
tsearch2(PG_FUNCTION_ARGS)
{
TriggerData *trigdata;
Trigger *trigger;
Relation rel;
HeapTuple rettuple = NULL;
TSCfgInfo *cfg=findcfg(get_currcfg());
int numidxattr,
i;
PRSTEXT prs;
Datum datum = (Datum) 0;
Oid funcoid = InvalidOid;
if (!CALLED_AS_TRIGGER(fcinfo))
/* internal error */
elog(ERROR, "TSearch: Not fired by trigger manager");
trigdata = (TriggerData *) fcinfo->context;
if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
/* internal error */
elog(ERROR, "TSearch: Can't process STATEMENT events");
if (TRIGGER_FIRED_AFTER(trigdata->tg_event))
/* internal error */
elog(ERROR, "TSearch: Must be fired BEFORE event");
if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
rettuple = trigdata->tg_trigtuple;
else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
rettuple = trigdata->tg_newtuple;
else
/* internal error */
elog(ERROR, "TSearch: Unknown event");
trigger = trigdata->tg_trigger;
rel = trigdata->tg_relation;
if (trigger->tgnargs < 2)
/* internal error */
elog(ERROR, "TSearch: format tsearch2(tsvector_field, text_field1,...)");
numidxattr = SPI_fnumber(rel->rd_att, trigger->tgargs[0]);
if (numidxattr == SPI_ERROR_NOATTRIBUTE)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("tsvector column \"%s\" does not exist",
trigger->tgargs[0])));
prs.lenwords = 32;
prs.curwords = 0;
prs.pos = 0;
prs.words = (WORD *) palloc(sizeof(WORD) * prs.lenwords);
/* find all words in indexable column */
for (i = 1; i < trigger->tgnargs; i++)
{
int numattr;
Oid oidtype;
Datum txt_toasted;
bool isnull;
text *txt;
numattr = SPI_fnumber(rel->rd_att, trigger->tgargs[i]);
if (numattr == SPI_ERROR_NOATTRIBUTE)
{
funcoid=findFunc(trigger->tgargs[i]);
if ( funcoid==InvalidOid )
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("could not find function or field \"%s\"",
trigger->tgargs[i])));
continue;
}
oidtype = SPI_gettypeid(rel->rd_att, numattr);
/* We assume char() and varchar() are binary-equivalent to text */
if (!(oidtype == TEXTOID ||
oidtype == VARCHAROID ||
oidtype == BPCHAROID))
{
elog(WARNING, "TSearch: '%s' is not of character type",
trigger->tgargs[i]);
continue;
}
txt_toasted = SPI_getbinval(rettuple, rel->rd_att, numattr, &isnull);
if (isnull)
continue;
if ( funcoid!=InvalidOid ) {
text *txttmp = (text *) DatumGetPointer( OidFunctionCall1(
funcoid,
PointerGetDatum(txt_toasted)
));
txt = (text *) DatumGetPointer(PG_DETOAST_DATUM(PointerGetDatum(txttmp)));
if ( txt == txttmp )
txt_toasted = PointerGetDatum(txt);
} else
txt = (text *) DatumGetPointer(PG_DETOAST_DATUM(PointerGetDatum(txt_toasted)));
parsetext_v2(cfg, &prs, VARDATA(txt), VARSIZE(txt) - VARHDRSZ);
if (txt != (text*)DatumGetPointer(txt_toasted) )
pfree(txt);
}
/* make tsvector value */
if (prs.curwords)
{
datum = PointerGetDatum(makevalue(&prs));
rettuple = SPI_modifytuple(rel, rettuple, 1, &numidxattr,
&datum, NULL);
pfree(DatumGetPointer(datum));
}
else
{
tsvector *out = palloc(CALCDATASIZE(0,0));
out->len = CALCDATASIZE(0,0);
out->size = 0;
datum = PointerGetDatum(out);
pfree(prs.words);
rettuple = SPI_modifytuple(rel, rettuple, 1, &numidxattr,
&datum, NULL);
}
if (rettuple == NULL)
/* internal error */
elog(ERROR, "TSearch: %d returned by SPI_modifytuple", SPI_result);
return PointerGetDatum(rettuple);
}
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