/*
** Buffer zInput, length nInput, contains the contents of a quoted string
** that appeared as part of an fts3 query expression. Neither quote character
** is included in the buffer. This function attempts to tokenize the entire
** input buffer and create an Fts3Expr structure of type FTSQUERY_PHRASE
** containing the results.
**
** If successful, SQLITE_OK is returned and *ppExpr set to point at the
** allocated Fts3Expr structure. Otherwise, either SQLITE_NOMEM (out of memory
** error) or SQLITE_ERROR (tokenization error) is returned and *ppExpr set
** to 0.
*/
static int getNextString(
ParseContext *pParse, /* fts3 query parse context */
const char *zInput, int nInput, /* Input string */
Fts3Expr **ppExpr /* OUT: expression */
){
sqlite3_tokenizer *pTokenizer = pParse->pTokenizer;
sqlite3_tokenizer_module const *pModule = pTokenizer->pModule;
int rc;
Fts3Expr *p = 0;
sqlite3_tokenizer_cursor *pCursor = 0;
char *zTemp = 0;
int nTemp = 0;
rc = pModule->xOpen(pTokenizer, zInput, nInput, &pCursor);
if( rc==SQLITE_OK ){
int ii;
pCursor->pTokenizer = pTokenizer;
for(ii=0; rc==SQLITE_OK; ii++){
const char *zToken;
int nToken, iBegin, iEnd, iPos;
rc = pModule->xNext(pCursor, &zToken, &nToken, &iBegin, &iEnd, &iPos);
if( rc==SQLITE_OK ){
int nByte = sizeof(Fts3Expr) + sizeof(Fts3Phrase);
p = fts3ReallocOrFree(p, nByte+ii*sizeof(Fts3PhraseToken));
zTemp = fts3ReallocOrFree(zTemp, nTemp + nToken);
if( !p || !zTemp ){
goto no_mem;
}
if( ii==0 ){
memset(p, 0, nByte);
p->pPhrase = (Fts3Phrase *)&p[1];
}
p->pPhrase = (Fts3Phrase *)&p[1];
memset(&p->pPhrase->aToken[ii], 0, sizeof(Fts3PhraseToken));
p->pPhrase->nToken = ii+1;
p->pPhrase->aToken[ii].n = nToken;
memcpy(&zTemp[nTemp], zToken, nToken);
nTemp += nToken;
if( iEnd<nInput && zInput[iEnd]=='*' ){
p->pPhrase->aToken[ii].isPrefix = 1;
}else{
p->pPhrase->aToken[ii].isPrefix = 0;
}
}
}
pModule->xClose(pCursor);
pCursor = 0;
}
if( rc==SQLITE_DONE ){
int jj;
char *zNew = NULL;
int nNew = 0;
int nByte = sizeof(Fts3Expr) + sizeof(Fts3Phrase);
nByte += (p?(p->pPhrase->nToken-1):0) * sizeof(Fts3PhraseToken);
p = fts3ReallocOrFree(p, nByte + nTemp);
if( !p ){
goto no_mem;
}
if( zTemp ){
zNew = &(((char *)p)[nByte]);
memcpy(zNew, zTemp, nTemp);
}else{
memset(p, 0, nByte+nTemp);
}
p->pPhrase = (Fts3Phrase *)&p[1];
for(jj=0; jj<p->pPhrase->nToken; jj++){
p->pPhrase->aToken[jj].z = &zNew[nNew];
nNew += p->pPhrase->aToken[jj].n;
}
sqlite3_free(zTemp);
p->eType = FTSQUERY_PHRASE;
p->pPhrase->iColumn = pParse->iDefaultCol;
rc = SQLITE_OK;
}
*ppExpr = p;
return rc;
no_mem:
if( pCursor ){
pModule->xClose(pCursor);
}
sqlite3_free(zTemp);
sqlite3_free(p);
*ppExpr = 0;
return SQLITE_NOMEM;
}
/*
** Buffer zInput, length nInput, contains the contents of a quoted string
** that appeared as part of an fts3 query expression. Neither quote character
** is included in the buffer. This function attempts to tokenize the entire
** input buffer and create an Fts3Expr structure of type FTSQUERY_PHRASE
** containing the results.
**
** If successful, SQLITE_OK is returned and *ppExpr set to point at the
** allocated Fts3Expr structure. Otherwise, either SQLITE_NOMEM (out of memory
** error) or SQLITE_ERROR (tokenization error) is returned and *ppExpr set
** to 0.
*/
static int getNextString(
ParseContext *pParse, /* fts3 query parse context */
const char *zInput, int nInput, /* Input string */
Fts3Expr **ppExpr /* OUT: expression */
){
sqlite3_tokenizer *pTokenizer = pParse->pTokenizer;
sqlite3_tokenizer_module const *pModule = pTokenizer->pModule;
int rc;
Fts3Expr *p = 0;
sqlite3_tokenizer_cursor *pCursor = 0;
char *zTemp = 0;
int nTemp = 0;
const int nSpace = sizeof(Fts3Expr) + sizeof(Fts3Phrase);
int nToken = 0;
/* The final Fts3Expr data structure, including the Fts3Phrase,
** Fts3PhraseToken structures token buffers are all stored as a single
** allocation so that the expression can be freed with a single call to
** sqlite3_free(). Setting this up requires a two pass approach.
**
** The first pass, in the block below, uses a tokenizer cursor to iterate
** through the tokens in the expression. This pass uses fts3ReallocOrFree()
** to assemble data in two dynamic buffers:
**
** Buffer p: Points to the Fts3Expr structure, followed by the Fts3Phrase
** structure, followed by the array of Fts3PhraseToken
** structures. This pass only populates the Fts3PhraseToken array.
**
** Buffer zTemp: Contains copies of all tokens.
**
** The second pass, in the block that begins "if( rc==SQLITE_DONE )" below,
** appends buffer zTemp to buffer p, and fills in the Fts3Expr and Fts3Phrase
** structures.
*/
rc = sqlite3Fts3OpenTokenizer(
pTokenizer, pParse->iLangid, zInput, nInput, &pCursor);
if( rc==SQLITE_OK ){
int ii;
for(ii=0; rc==SQLITE_OK; ii++){
const char *zByte;
int nByte = 0, iBegin = 0, iEnd = 0, iPos = 0;
rc = pModule->xNext(pCursor, &zByte, &nByte, &iBegin, &iEnd, &iPos);
if( rc==SQLITE_OK ){
Fts3PhraseToken *pToken;
p = fts3ReallocOrFree(p, nSpace + ii*sizeof(Fts3PhraseToken));
if( !p ) goto no_mem;
zTemp = fts3ReallocOrFree(zTemp, nTemp + nByte);
if( !zTemp ) goto no_mem;
assert( nToken==ii );
pToken = &((Fts3Phrase *)(&p[1]))->aToken[ii];
memset(pToken, 0, sizeof(Fts3PhraseToken));
memcpy(&zTemp[nTemp], zByte, nByte);
nTemp += nByte;
pToken->n = nByte;
pToken->isPrefix = (iEnd<nInput && zInput[iEnd]=='*');
pToken->bFirst = (iBegin>0 && zInput[iBegin-1]=='^');
nToken = ii+1;
}
}
pModule->xClose(pCursor);
pCursor = 0;
}
if( rc==SQLITE_DONE ){
int jj;
char *zBuf = 0;
p = fts3ReallocOrFree(p, nSpace + nToken*sizeof(Fts3PhraseToken) + nTemp);
if( !p ) goto no_mem;
memset(p, 0, (char *)&(((Fts3Phrase *)&p[1])->aToken[0])-(char *)p);
p->eType = FTSQUERY_PHRASE;
p->pPhrase = (Fts3Phrase *)&p[1];
p->pPhrase->iColumn = pParse->iDefaultCol;
p->pPhrase->nToken = nToken;
zBuf = (char *)&p->pPhrase->aToken[nToken];
if( zTemp ){
memcpy(zBuf, zTemp, nTemp);
sqlite3_free(zTemp);
}else{
assert( nTemp==0 );
}
for(jj=0; jj<p->pPhrase->nToken; jj++){
p->pPhrase->aToken[jj].z = zBuf;
zBuf += p->pPhrase->aToken[jj].n;
}
rc = SQLITE_OK;
}
*ppExpr = p;
return rc;
no_mem:
if( pCursor ){
pModule->xClose(pCursor);
}
sqlite3_free(zTemp);
sqlite3_free(p);
*ppExpr = 0;
return SQLITE_NOMEM;
}
