SQLite

      iDocid += iDelta;
      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " id=%lld", iDocid);
    }
  }

  return iOff;
}

/*
** This function is part of the fts5_decode() debugging function. It is 
** only ever used with detail=none tables.
**
** Buffer (pData/nData) contains a doclist in the format used by detail=none
** tables. This function appends a human-readable version of that list to
** buffer pBuf.
**
** If *pRc is other than SQLITE_OK when this function is called, it is a
** no-op. If an OOM or other error occurs within this function, *pRc is
** set to an SQLite error code before returning. The final state of buffer
** pBuf is undefined in this case.
*/
static void fts5DecodeRowidList(
  int *pRc,                       /* IN/OUT: Error code */
  Fts5Buffer *pBuf,               /* Buffer to append text to */
  const u8 *pData, int nData      /* Data to decode list-of-rowids from */
){
  int i = 0;
  i64 iRowid = 0;

  while( i<nData ){
    const char *zApp = "";
    u64 iVal;
    i += sqlite3Fts5GetVarint(&pData[i], &iVal);
    iRowid += iVal;

    if( i<nData && pData[i]==0x00 ){
      i++;
      if( i<nData && pData[i]==0x00 ){
        i++;
        zApp = "+";
      }else{
        zApp = "*";
      }
    }

    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " %lld%s", iRowid, zApp);
  }
}

/*
** The implementation of user-defined scalar function fts5_decode().
*/
static void fts5DecodeFunction(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args (always 2) */
  sqlite3_value **apVal           /* Function arguments */
){
  i64 iRowid;                     /* Rowid for record being decoded */
  int iSegid,iHeight,iPgno,bDlidx;/* Rowid components */
  const u8 *aBlob; int n;         /* Record to decode */
  u8 *a = 0;
  Fts5Buffer s;                   /* Build up text to return here */
  int rc = SQLITE_OK;             /* Return code */
  int nSpace = 0;
  int eDetailNone = (sqlite3_user_data(pCtx)!=0);

  assert( nArg==2 );
  memset(&s, 0, sizeof(Fts5Buffer));
  iRowid = sqlite3_value_int64(apVal[0]);

  /* Make a copy of the second argument (a blob) in aBlob[]. The aBlob[]
  ** copy is followed by FTS5_DATA_ZERO_PADDING 0x00 bytes, which prevents

    }
  }else if( iSegid==0 ){
    if( iRowid==FTS5_AVERAGES_ROWID ){
      fts5DecodeAverages(&rc, &s, a, n);
    }else{
      fts5DecodeStructure(&rc, &s, a, n);
    }
  }else if( eDetailNone ){
    Fts5Buffer term;              /* Current term read from page */
    int szLeaf;
    int iPgidxOff = szLeaf = fts5GetU16(&a[2]);
    int iTermOff;
    int nKeep = 0;
    int iOff;

    memset(&term, 0, sizeof(Fts5Buffer));

    /* Decode any entries that occur before the first term. */
    if( szLeaf<n ){
      fts5FastGetVarint32(a, iPgidxOff, iTermOff);
    }else{
      iTermOff = szLeaf;
    }
    fts5DecodeRowidList(&rc, &s, &a[4], iTermOff-4);

    iOff = iTermOff;
    while( iOff<szLeaf ){
      int nAppend;

      /* Read the term data for the next term*/
      fts5FastGetVarint32(a, iOff, nAppend);
      term.n = nKeep;
      fts5BufferAppendBlob(&rc, &term, nAppend, &a[iOff]);
      sqlite3Fts5BufferAppendPrintf(
          &rc, &s, " term=%.*s", term.n, (const char*)term.p
      );
      iOff += nAppend;

      /* Figure out where the doclist for this term ends */
      if( iPgidxOff<n ){
        int nIncr;
        fts5FastGetVarint32(a, iPgidxOff, nIncr);
        iTermOff += nIncr;
      }else{
        iTermOff = szLeaf;
      }

      fts5DecodeRowidList(&rc, &s, &a[iOff], iTermOff-iOff);
      iOff = iTermOff;
      if( iOff<szLeaf ){
        fts5FastGetVarint32(a, iOff, nKeep);
      }
    }

    fts5BufferFree(&term);
  }else{
    Fts5Buffer term;              /* Current term read from page */
    int szLeaf;                   /* Offset of pgidx in a[] */
    int iPgidxOff;
    int iPgidxPrev = 0;           /* Previous value read from pgidx */
    int iTermOff = 0;
    int iRowidOff = 0;

** If successful, SQLITE_OK is returned. If an error occurs, some other
** SQLite error code is returned instead.
*/
int sqlite3Fts5IndexInit(sqlite3 *db){
  int rc = sqlite3_create_function(
      db, "fts5_decode", 2, SQLITE_UTF8, 0, fts5DecodeFunction, 0, 0
  );

  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(
        db, "fts5_decode_none", 2, 
        SQLITE_UTF8, (void*)db, fts5DecodeFunction, 0, 0
    );
  }

  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(
        db, "fts5_rowid", -1, SQLITE_UTF8, 0, fts5RowidFunction, 0, 0
    );
  }
  return rc;
}

}
source $testdir/tester.tcl

catch { 
  sqlite3_fts5_may_be_corrupt 0 
  reset_db
}

# If SQLITE_ENABLE_FTS5 is not defined, skip this test.
ifcapable !fts5 {
  finish_test
  return
}

proc fts5_test_poslist {cmd} {
  set res [list]
  for {set i 0} {$i < [$cmd xInstCount]} {incr i} {
    lappend res [string map {{ } .} [$cmd xInst $i]]
  }
  set res

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

if 1 {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, detail=none);
  INSERT INTO t1 VALUES('a b c');
}
do_execsql_test 1.1 {
  SELECT rowid FROM t1('c a b')
} {1}

  SELECT rowid FROM t1('sqlite') ORDER BY rowid DESC;
} {}

do_test 15.4 {
  execsql { INSERT INTO t1(t1) VALUES('integrity-check') }
} {}

}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 16.0 {
  CREATE VIRTUAL TABLE t2 USING fts5(x, detail=none);
  BEGIN;
    INSERT INTO t2(rowid, x) VALUES(1, 'a b c');

  INSERT INTO t2(t2) VALUES('integrity-check');
} {}

do_execsql_test 16.2 {
  SELECT rowid FROM t2('b') ORDER BY rowid DESC
} {1000 456 1}


#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 16.0 {
  CREATE VIRTUAL TABLE t2 USING fts5(x, detail=none);
  BEGIN;
    INSERT INTO t2(rowid, x) VALUES(1, 'a b c');
    INSERT INTO t2(rowid, x) VALUES(456, 'a b c');
    INSERT INTO t2(rowid, x) VALUES(1000, 'a b c');
  COMMIT;
  UPDATE t2 SET x=x;
  DELETE FROM t2;
}

#db eval {SELECT rowid, fts5_decode_none(rowid, block) aS r FROM t2_data} {puts $r}
  
finish_test