551 lines
17 KiB
C
551 lines
17 KiB
C
/*
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** 2011 Jan 27
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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******************************************************************************
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**
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*/
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#include "fts3Int.h"
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#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
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#include <string.h>
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#include <assert.h>
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typedef struct Fts3auxTable Fts3auxTable;
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typedef struct Fts3auxCursor Fts3auxCursor;
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struct Fts3auxTable {
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sqlite3_vtab base; /* Base class used by SQLite core */
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Fts3Table *pFts3Tab;
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};
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struct Fts3auxCursor {
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sqlite3_vtab_cursor base; /* Base class used by SQLite core */
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Fts3MultiSegReader csr; /* Must be right after "base" */
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Fts3SegFilter filter;
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char *zStop;
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int nStop; /* Byte-length of string zStop */
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int iLangid; /* Language id to query */
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int isEof; /* True if cursor is at EOF */
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sqlite3_int64 iRowid; /* Current rowid */
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int iCol; /* Current value of 'col' column */
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int nStat; /* Size of aStat[] array */
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struct Fts3auxColstats {
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sqlite3_int64 nDoc; /* 'documents' values for current csr row */
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sqlite3_int64 nOcc; /* 'occurrences' values for current csr row */
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} *aStat;
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};
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/*
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** Schema of the terms table.
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*/
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#define FTS3_AUX_SCHEMA \
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"CREATE TABLE x(term, col, documents, occurrences, languageid HIDDEN)"
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/*
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** This function does all the work for both the xConnect and xCreate methods.
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** These tables have no persistent representation of their own, so xConnect
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** and xCreate are identical operations.
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*/
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static int fts3auxConnectMethod(
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sqlite3 *db, /* Database connection */
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void *pUnused, /* Unused */
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int argc, /* Number of elements in argv array */
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const char * const *argv, /* xCreate/xConnect argument array */
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sqlite3_vtab **ppVtab, /* OUT: New sqlite3_vtab object */
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char **pzErr /* OUT: sqlite3_malloc'd error message */
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){
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char const *zDb; /* Name of database (e.g. "main") */
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char const *zFts3; /* Name of fts3 table */
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int nDb; /* Result of strlen(zDb) */
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int nFts3; /* Result of strlen(zFts3) */
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int nByte; /* Bytes of space to allocate here */
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int rc; /* value returned by declare_vtab() */
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Fts3auxTable *p; /* Virtual table object to return */
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UNUSED_PARAMETER(pUnused);
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/* The user should invoke this in one of two forms:
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**
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** CREATE VIRTUAL TABLE xxx USING fts4aux(fts4-table);
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** CREATE VIRTUAL TABLE xxx USING fts4aux(fts4-table-db, fts4-table);
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*/
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if( argc!=4 && argc!=5 ) goto bad_args;
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zDb = argv[1];
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nDb = (int)strlen(zDb);
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if( argc==5 ){
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if( nDb==4 && 0==sqlite3_strnicmp("temp", zDb, 4) ){
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zDb = argv[3];
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nDb = (int)strlen(zDb);
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zFts3 = argv[4];
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}else{
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goto bad_args;
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}
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}else{
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zFts3 = argv[3];
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}
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nFts3 = (int)strlen(zFts3);
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rc = sqlite3_declare_vtab(db, FTS3_AUX_SCHEMA);
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if( rc!=SQLITE_OK ) return rc;
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nByte = sizeof(Fts3auxTable) + sizeof(Fts3Table) + nDb + nFts3 + 2;
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p = (Fts3auxTable *)sqlite3_malloc(nByte);
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if( !p ) return SQLITE_NOMEM;
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memset(p, 0, nByte);
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p->pFts3Tab = (Fts3Table *)&p[1];
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p->pFts3Tab->zDb = (char *)&p->pFts3Tab[1];
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p->pFts3Tab->zName = &p->pFts3Tab->zDb[nDb+1];
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p->pFts3Tab->db = db;
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p->pFts3Tab->nIndex = 1;
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memcpy((char *)p->pFts3Tab->zDb, zDb, nDb);
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memcpy((char *)p->pFts3Tab->zName, zFts3, nFts3);
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sqlite3Fts3Dequote((char *)p->pFts3Tab->zName);
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*ppVtab = (sqlite3_vtab *)p;
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return SQLITE_OK;
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bad_args:
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*pzErr = sqlite3_mprintf("invalid arguments to fts4aux constructor");
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return SQLITE_ERROR;
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}
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/*
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** This function does the work for both the xDisconnect and xDestroy methods.
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** These tables have no persistent representation of their own, so xDisconnect
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** and xDestroy are identical operations.
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*/
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static int fts3auxDisconnectMethod(sqlite3_vtab *pVtab){
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Fts3auxTable *p = (Fts3auxTable *)pVtab;
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Fts3Table *pFts3 = p->pFts3Tab;
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int i;
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/* Free any prepared statements held */
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for(i=0; i<SizeofArray(pFts3->aStmt); i++){
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sqlite3_finalize(pFts3->aStmt[i]);
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}
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sqlite3_free(pFts3->zSegmentsTbl);
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sqlite3_free(p);
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return SQLITE_OK;
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}
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#define FTS4AUX_EQ_CONSTRAINT 1
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#define FTS4AUX_GE_CONSTRAINT 2
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#define FTS4AUX_LE_CONSTRAINT 4
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/*
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** xBestIndex - Analyze a WHERE and ORDER BY clause.
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*/
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static int fts3auxBestIndexMethod(
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sqlite3_vtab *pVTab,
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sqlite3_index_info *pInfo
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){
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int i;
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int iEq = -1;
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int iGe = -1;
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int iLe = -1;
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int iLangid = -1;
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int iNext = 1; /* Next free argvIndex value */
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UNUSED_PARAMETER(pVTab);
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/* This vtab delivers always results in "ORDER BY term ASC" order. */
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if( pInfo->nOrderBy==1
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&& pInfo->aOrderBy[0].iColumn==0
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&& pInfo->aOrderBy[0].desc==0
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){
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pInfo->orderByConsumed = 1;
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}
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/* Search for equality and range constraints on the "term" column.
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** And equality constraints on the hidden "languageid" column. */
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for(i=0; i<pInfo->nConstraint; i++){
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if( pInfo->aConstraint[i].usable ){
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int op = pInfo->aConstraint[i].op;
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int iCol = pInfo->aConstraint[i].iColumn;
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if( iCol==0 ){
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if( op==SQLITE_INDEX_CONSTRAINT_EQ ) iEq = i;
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if( op==SQLITE_INDEX_CONSTRAINT_LT ) iLe = i;
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if( op==SQLITE_INDEX_CONSTRAINT_LE ) iLe = i;
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if( op==SQLITE_INDEX_CONSTRAINT_GT ) iGe = i;
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if( op==SQLITE_INDEX_CONSTRAINT_GE ) iGe = i;
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}
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if( iCol==4 ){
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if( op==SQLITE_INDEX_CONSTRAINT_EQ ) iLangid = i;
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}
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}
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}
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if( iEq>=0 ){
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pInfo->idxNum = FTS4AUX_EQ_CONSTRAINT;
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pInfo->aConstraintUsage[iEq].argvIndex = iNext++;
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pInfo->estimatedCost = 5;
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}else{
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pInfo->idxNum = 0;
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pInfo->estimatedCost = 20000;
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if( iGe>=0 ){
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pInfo->idxNum += FTS4AUX_GE_CONSTRAINT;
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pInfo->aConstraintUsage[iGe].argvIndex = iNext++;
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pInfo->estimatedCost /= 2;
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}
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if( iLe>=0 ){
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pInfo->idxNum += FTS4AUX_LE_CONSTRAINT;
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pInfo->aConstraintUsage[iLe].argvIndex = iNext++;
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pInfo->estimatedCost /= 2;
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}
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}
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if( iLangid>=0 ){
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pInfo->aConstraintUsage[iLangid].argvIndex = iNext++;
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pInfo->estimatedCost--;
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}
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return SQLITE_OK;
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}
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/*
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** xOpen - Open a cursor.
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*/
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static int fts3auxOpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){
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Fts3auxCursor *pCsr; /* Pointer to cursor object to return */
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UNUSED_PARAMETER(pVTab);
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pCsr = (Fts3auxCursor *)sqlite3_malloc(sizeof(Fts3auxCursor));
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if( !pCsr ) return SQLITE_NOMEM;
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memset(pCsr, 0, sizeof(Fts3auxCursor));
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*ppCsr = (sqlite3_vtab_cursor *)pCsr;
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return SQLITE_OK;
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}
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/*
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** xClose - Close a cursor.
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*/
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static int fts3auxCloseMethod(sqlite3_vtab_cursor *pCursor){
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Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab;
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Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
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sqlite3Fts3SegmentsClose(pFts3);
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sqlite3Fts3SegReaderFinish(&pCsr->csr);
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sqlite3_free((void *)pCsr->filter.zTerm);
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sqlite3_free(pCsr->zStop);
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sqlite3_free(pCsr->aStat);
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sqlite3_free(pCsr);
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return SQLITE_OK;
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}
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static int fts3auxGrowStatArray(Fts3auxCursor *pCsr, int nSize){
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if( nSize>pCsr->nStat ){
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struct Fts3auxColstats *aNew;
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aNew = (struct Fts3auxColstats *)sqlite3_realloc(pCsr->aStat,
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sizeof(struct Fts3auxColstats) * nSize
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);
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if( aNew==0 ) return SQLITE_NOMEM;
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memset(&aNew[pCsr->nStat], 0,
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sizeof(struct Fts3auxColstats) * (nSize - pCsr->nStat)
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);
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pCsr->aStat = aNew;
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pCsr->nStat = nSize;
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}
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return SQLITE_OK;
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}
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/*
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** xNext - Advance the cursor to the next row, if any.
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*/
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static int fts3auxNextMethod(sqlite3_vtab_cursor *pCursor){
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Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
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Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab;
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int rc;
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/* Increment our pretend rowid value. */
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pCsr->iRowid++;
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for(pCsr->iCol++; pCsr->iCol<pCsr->nStat; pCsr->iCol++){
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if( pCsr->aStat[pCsr->iCol].nDoc>0 ) return SQLITE_OK;
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}
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rc = sqlite3Fts3SegReaderStep(pFts3, &pCsr->csr);
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if( rc==SQLITE_ROW ){
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int i = 0;
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int nDoclist = pCsr->csr.nDoclist;
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char *aDoclist = pCsr->csr.aDoclist;
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int iCol;
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int eState = 0;
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if( pCsr->zStop ){
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int n = (pCsr->nStop<pCsr->csr.nTerm) ? pCsr->nStop : pCsr->csr.nTerm;
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int mc = memcmp(pCsr->zStop, pCsr->csr.zTerm, n);
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if( mc<0 || (mc==0 && pCsr->csr.nTerm>pCsr->nStop) ){
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pCsr->isEof = 1;
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return SQLITE_OK;
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}
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}
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if( fts3auxGrowStatArray(pCsr, 2) ) return SQLITE_NOMEM;
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memset(pCsr->aStat, 0, sizeof(struct Fts3auxColstats) * pCsr->nStat);
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iCol = 0;
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while( i<nDoclist ){
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sqlite3_int64 v = 0;
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i += sqlite3Fts3GetVarint(&aDoclist[i], &v);
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switch( eState ){
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/* State 0. In this state the integer just read was a docid. */
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case 0:
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pCsr->aStat[0].nDoc++;
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eState = 1;
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iCol = 0;
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break;
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/* State 1. In this state we are expecting either a 1, indicating
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** that the following integer will be a column number, or the
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** start of a position list for column 0.
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**
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** The only difference between state 1 and state 2 is that if the
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** integer encountered in state 1 is not 0 or 1, then we need to
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** increment the column 0 "nDoc" count for this term.
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*/
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case 1:
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assert( iCol==0 );
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if( v>1 ){
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pCsr->aStat[1].nDoc++;
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}
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eState = 2;
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/* fall through */
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case 2:
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if( v==0 ){ /* 0x00. Next integer will be a docid. */
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eState = 0;
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}else if( v==1 ){ /* 0x01. Next integer will be a column number. */
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eState = 3;
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}else{ /* 2 or greater. A position. */
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pCsr->aStat[iCol+1].nOcc++;
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pCsr->aStat[0].nOcc++;
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}
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break;
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/* State 3. The integer just read is a column number. */
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default: assert( eState==3 );
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iCol = (int)v;
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if( fts3auxGrowStatArray(pCsr, iCol+2) ) return SQLITE_NOMEM;
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pCsr->aStat[iCol+1].nDoc++;
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eState = 2;
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break;
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}
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}
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pCsr->iCol = 0;
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rc = SQLITE_OK;
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}else{
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pCsr->isEof = 1;
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}
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return rc;
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}
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/*
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** xFilter - Initialize a cursor to point at the start of its data.
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*/
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static int fts3auxFilterMethod(
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sqlite3_vtab_cursor *pCursor, /* The cursor used for this query */
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int idxNum, /* Strategy index */
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const char *idxStr, /* Unused */
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int nVal, /* Number of elements in apVal */
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sqlite3_value **apVal /* Arguments for the indexing scheme */
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){
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Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
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Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab;
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int rc;
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int isScan = 0;
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int iLangVal = 0; /* Language id to query */
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int iEq = -1; /* Index of term=? value in apVal */
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int iGe = -1; /* Index of term>=? value in apVal */
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int iLe = -1; /* Index of term<=? value in apVal */
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int iLangid = -1; /* Index of languageid=? value in apVal */
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int iNext = 0;
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UNUSED_PARAMETER(nVal);
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UNUSED_PARAMETER(idxStr);
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assert( idxStr==0 );
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assert( idxNum==FTS4AUX_EQ_CONSTRAINT || idxNum==0
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|| idxNum==FTS4AUX_LE_CONSTRAINT || idxNum==FTS4AUX_GE_CONSTRAINT
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|| idxNum==(FTS4AUX_LE_CONSTRAINT|FTS4AUX_GE_CONSTRAINT)
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);
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if( idxNum==FTS4AUX_EQ_CONSTRAINT ){
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iEq = iNext++;
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}else{
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isScan = 1;
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if( idxNum & FTS4AUX_GE_CONSTRAINT ){
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iGe = iNext++;
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}
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if( idxNum & FTS4AUX_LE_CONSTRAINT ){
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iLe = iNext++;
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}
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}
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if( iNext<nVal ){
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iLangid = iNext++;
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}
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/* In case this cursor is being reused, close and zero it. */
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testcase(pCsr->filter.zTerm);
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sqlite3Fts3SegReaderFinish(&pCsr->csr);
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sqlite3_free((void *)pCsr->filter.zTerm);
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sqlite3_free(pCsr->aStat);
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memset(&pCsr->csr, 0, ((u8*)&pCsr[1]) - (u8*)&pCsr->csr);
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pCsr->filter.flags = FTS3_SEGMENT_REQUIRE_POS|FTS3_SEGMENT_IGNORE_EMPTY;
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if( isScan ) pCsr->filter.flags |= FTS3_SEGMENT_SCAN;
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if( iEq>=0 || iGe>=0 ){
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const unsigned char *zStr = sqlite3_value_text(apVal[0]);
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assert( (iEq==0 && iGe==-1) || (iEq==-1 && iGe==0) );
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if( zStr ){
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pCsr->filter.zTerm = sqlite3_mprintf("%s", zStr);
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pCsr->filter.nTerm = sqlite3_value_bytes(apVal[0]);
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if( pCsr->filter.zTerm==0 ) return SQLITE_NOMEM;
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}
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}
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if( iLe>=0 ){
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pCsr->zStop = sqlite3_mprintf("%s", sqlite3_value_text(apVal[iLe]));
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pCsr->nStop = sqlite3_value_bytes(apVal[iLe]);
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if( pCsr->zStop==0 ) return SQLITE_NOMEM;
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}
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if( iLangid>=0 ){
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iLangVal = sqlite3_value_int(apVal[iLangid]);
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/* If the user specified a negative value for the languageid, use zero
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** instead. This works, as the "languageid=?" constraint will also
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** be tested by the VDBE layer. The test will always be false (since
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** this module will not return a row with a negative languageid), and
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** so the overall query will return zero rows. */
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if( iLangVal<0 ) iLangVal = 0;
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}
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pCsr->iLangid = iLangVal;
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rc = sqlite3Fts3SegReaderCursor(pFts3, iLangVal, 0, FTS3_SEGCURSOR_ALL,
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pCsr->filter.zTerm, pCsr->filter.nTerm, 0, isScan, &pCsr->csr
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);
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if( rc==SQLITE_OK ){
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rc = sqlite3Fts3SegReaderStart(pFts3, &pCsr->csr, &pCsr->filter);
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}
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if( rc==SQLITE_OK ) rc = fts3auxNextMethod(pCursor);
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return rc;
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}
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/*
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** xEof - Return true if the cursor is at EOF, or false otherwise.
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*/
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static int fts3auxEofMethod(sqlite3_vtab_cursor *pCursor){
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Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
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return pCsr->isEof;
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}
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/*
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** xColumn - Return a column value.
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*/
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static int fts3auxColumnMethod(
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sqlite3_vtab_cursor *pCursor, /* Cursor to retrieve value from */
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sqlite3_context *pCtx, /* Context for sqlite3_result_xxx() calls */
|
|
int iCol /* Index of column to read value from */
|
|
){
|
|
Fts3auxCursor *p = (Fts3auxCursor *)pCursor;
|
|
|
|
assert( p->isEof==0 );
|
|
switch( iCol ){
|
|
case 0: /* term */
|
|
sqlite3_result_text(pCtx, p->csr.zTerm, p->csr.nTerm, SQLITE_TRANSIENT);
|
|
break;
|
|
|
|
case 1: /* col */
|
|
if( p->iCol ){
|
|
sqlite3_result_int(pCtx, p->iCol-1);
|
|
}else{
|
|
sqlite3_result_text(pCtx, "*", -1, SQLITE_STATIC);
|
|
}
|
|
break;
|
|
|
|
case 2: /* documents */
|
|
sqlite3_result_int64(pCtx, p->aStat[p->iCol].nDoc);
|
|
break;
|
|
|
|
case 3: /* occurrences */
|
|
sqlite3_result_int64(pCtx, p->aStat[p->iCol].nOcc);
|
|
break;
|
|
|
|
default: /* languageid */
|
|
assert( iCol==4 );
|
|
sqlite3_result_int(pCtx, p->iLangid);
|
|
break;
|
|
}
|
|
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
/*
|
|
** xRowid - Return the current rowid for the cursor.
|
|
*/
|
|
static int fts3auxRowidMethod(
|
|
sqlite3_vtab_cursor *pCursor, /* Cursor to retrieve value from */
|
|
sqlite_int64 *pRowid /* OUT: Rowid value */
|
|
){
|
|
Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
|
|
*pRowid = pCsr->iRowid;
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
/*
|
|
** Register the fts3aux module with database connection db. Return SQLITE_OK
|
|
** if successful or an error code if sqlite3_create_module() fails.
|
|
*/
|
|
int sqlite3Fts3InitAux(sqlite3 *db){
|
|
static const sqlite3_module fts3aux_module = {
|
|
0, /* iVersion */
|
|
fts3auxConnectMethod, /* xCreate */
|
|
fts3auxConnectMethod, /* xConnect */
|
|
fts3auxBestIndexMethod, /* xBestIndex */
|
|
fts3auxDisconnectMethod, /* xDisconnect */
|
|
fts3auxDisconnectMethod, /* xDestroy */
|
|
fts3auxOpenMethod, /* xOpen */
|
|
fts3auxCloseMethod, /* xClose */
|
|
fts3auxFilterMethod, /* xFilter */
|
|
fts3auxNextMethod, /* xNext */
|
|
fts3auxEofMethod, /* xEof */
|
|
fts3auxColumnMethod, /* xColumn */
|
|
fts3auxRowidMethod, /* xRowid */
|
|
0, /* xUpdate */
|
|
0, /* xBegin */
|
|
0, /* xSync */
|
|
0, /* xCommit */
|
|
0, /* xRollback */
|
|
0, /* xFindFunction */
|
|
0, /* xRename */
|
|
0, /* xSavepoint */
|
|
0, /* xRelease */
|
|
0 /* xRollbackTo */
|
|
};
|
|
int rc; /* Return code */
|
|
|
|
rc = sqlite3_create_module(db, "fts4aux", &fts3aux_module, 0);
|
|
return rc;
|
|
}
|
|
|
|
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
|