** methods of the FTS3 virtual table.
**
** The argv[] array contains the following:
**
**   argv[0]   -> module name
**   argv[1]   -> database name
**   argv[2]   -> table name
**   argv[...] -> "column name" fields...
*/
int fts3InitVtab(
  int isCreate,                   /* True for xCreate, false for xConnect */
  sqlite3 *db,                    /* The SQLite database connection */
  void *pAux,                     /* Hash table containing tokenizers */
  int argc,                       /* Number of elements in argv array */
  const char * const *argv,       /* xCreate/xConnect argument array */
  sqlite3_vtab **ppVTab,          /* Write the resulting vtab structure here */
  char **pzErr                    /* Write any error message here */
){
  Fts3Hash *pHash = (Fts3Hash *)pAux;
  Fts3Table *p;               /* Pointer to allocated vtab */
  int rc;                         /* Return code */
  int i;
  int nByte;
  int iCol;
  int nString = 0;
  int nCol = 0;
  char *zCsr;
  int nDb;
  int nName;

................................................................................
  if( zTokenizer==0 ){
    rc = sqlite3Fts3InitTokenizer(pHash, 0, &pTokenizer, 0, pzErr);
    if( rc!=SQLITE_OK ){
      return rc;
    }
    assert( pTokenizer );
  }





  /* Allocate and populate the Fts3Table structure. */
  nByte = sizeof(Fts3Table) +              /* Fts3Table */
          nCol * sizeof(char *) +              /* azColumn */
          nName +                              /* zName */
          nDb +                                /* zDb */
          nString;                             /* Space for azColumn strings */
................................................................................
      zCsr[n] = '\0';
      sqlite3Fts3Dequote(zCsr);
      p->azColumn[iCol++] = zCsr;
      zCsr += n+1;
      assert( zCsr <= &((char *)p)[nByte] );
    }
  }





  /* If this is an xCreate call, create the underlying tables in the 
  ** database. TODO: For xConnect(), it could verify that said tables exist.
  */
  if( isCreate ){
    rc = fts3CreateTables(p);
    if( rc!=SQLITE_OK ) goto fts3_init_out;

** methods of the FTS3 virtual table.
**
** The argv[] array contains the following:
**
**   argv[0]   -> module name
**   argv[1]   -> database name
**   argv[2]   -> table name
**   argv[...] -> "column name" and other module argument fields.
*/
int fts3InitVtab(
  int isCreate,                   /* True for xCreate, false for xConnect */
  sqlite3 *db,                    /* The SQLite database connection */
  void *pAux,                     /* Hash table containing tokenizers */
  int argc,                       /* Number of elements in argv array */
  const char * const *argv,       /* xCreate/xConnect argument array */
  sqlite3_vtab **ppVTab,          /* Write the resulting vtab structure here */
  char **pzErr                    /* Write any error message here */
){
  Fts3Hash *pHash = (Fts3Hash *)pAux;
  Fts3Table *p;                   /* Pointer to allocated vtab */
  int rc;                         /* Return code */
  int i;                          /* Iterator variable */
  int nByte;                      /* Size of allocation used for *p */
  int iCol;
  int nString = 0;
  int nCol = 0;
  char *zCsr;
  int nDb;
  int nName;

................................................................................
  if( zTokenizer==0 ){
    rc = sqlite3Fts3InitTokenizer(pHash, 0, &pTokenizer, 0, pzErr);
    if( rc!=SQLITE_OK ){
      return rc;
    }
    assert( pTokenizer );
  }

  if( nCol==0 ){
    nCol = 1;
  }

  /* Allocate and populate the Fts3Table structure. */
  nByte = sizeof(Fts3Table) +              /* Fts3Table */
          nCol * sizeof(char *) +              /* azColumn */
          nName +                              /* zName */
          nDb +                                /* zDb */
          nString;                             /* Space for azColumn strings */
................................................................................
      zCsr[n] = '\0';
      sqlite3Fts3Dequote(zCsr);
      p->azColumn[iCol++] = zCsr;
      zCsr += n+1;
      assert( zCsr <= &((char *)p)[nByte] );
    }
  }
  if( iCol==0 ){
    assert( nCol==1 );
    p->azColumn[0] = "content";
  }

  /* If this is an xCreate call, create the underlying tables in the 
  ** database. TODO: For xConnect(), it could verify that said tables exist.
  */
  if( isCreate ){
    rc = fts3CreateTables(p);
    if( rc!=SQLITE_OK ) goto fts3_init_out;

    }
    p->iLastCol = iCol;
    p->iLastPos = 0;
  }
  if( iCol>=0 ){
    assert( iPos>p->iLastPos || (iPos==0 && p->iLastPos==0) );
    rc = fts3PendingListAppendVarint(&p, 2+iPos-p->iLastPos);

    p->iLastPos = iPos;
  }


 pendinglistappend_out:
  *pRc = rc;
  if( p!=*pp ){
    *pp = p;
    return 1;
  }

    }
    p->iLastCol = iCol;
    p->iLastPos = 0;
  }
  if( iCol>=0 ){
    assert( iPos>p->iLastPos || (iPos==0 && p->iLastPos==0) );
    rc = fts3PendingListAppendVarint(&p, 2+iPos-p->iLastPos);
    if( rc==SQLITE_OK ){
      p->iLastPos = iPos;
    }
  }

 pendinglistappend_out:
  *pRc = rc;
  if( p!=*pp ){
    *pp = p;
    return 1;
  }

# 2009 November 28
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# This file implements tests to verify the "testable statements" in the
# fts3.in document.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

ifcapable !fts3 {
  finish_test
  return
}
source $testdir/fts3_common.tcl

set DO_MALLOC_TEST 0

# Procs used to make the tests in this file easier to read.
#
proc ddl_test {tn ddl} {
  uplevel [list do_write_test e_fts3-$tn sqlite_master $ddl]
}
proc write_test {tn tbl sql} {
  uplevel [list do_write_test e_fts3-$tn $tbl $sql]
}
proc read_test {tn sql result} {
  uplevel [list do_select_test e_fts3-$tn $sql $result]
}

#-----------------------------------------------------------------
# Test the example CREATE VIRTUAL TABLE statements in section 1.1 
# of fts3.in.
#
ddl_test   1.1.1 {CREATE VIRTUAL TABLE data USING fts3()}
read_test  1.1.2 {PRAGMA table_info(data)} {0 content {} 0 {} 0}

ddl_test   1.2.1 {
  CREATE VIRTUAL TABLE pages USING fts3(title, keywords, body)
}
read_test  1.2.2 {
  PRAGMA table_info(pages)
} {0 title {} 0 {} 0 1 keywords {} 0 {} 0 2 body {} 0 {} 0}

ddl_test   1.3.1 {
  CREATE VIRTUAL TABLE mail USING fts3(
      subject VARCHAR(256) NOT NULL,
      body TEXT CHECK(length(body)<10240)
  )
}
read_test  1.3.2 {
  PRAGMA table_info(mail)
} {0 subject {} 0 {} 0 1 body {} 0 {} 0}

# A very large string. Used to test if the constraint on column "body" of
# table "mail" is enforced (it should not be - FTS3 tables do not support
# constraints).
set largetext [string repeat "the quick brown fox " 5000]
write_test 1.3.3 mail_content { INSERT INTO mail VALUES(NULL, $largetext) }
read_test  1.3.4 {
  SELECT subject IS NULL, length(body) FROM mail
} [list 1 100000]

finish_test

        foreach {t d} [fts3_readleaf $block] { lappend a($t) $d }

      }
    }
  }
}

        foreach {t d} [fts3_readleaf $block] { lappend a($t) $d }

      }
    }
  }
}

##########################################################################

#-------------------------------------------------------------------------
# This proc is used to test a single SELECT statement. Parameter $name is
# passed a name for the test case (i.e. "fts3_malloc-1.4.1") and parameter
# $sql is passed the text of the SELECT statement. Parameter $result is
# set to the expected output if the SELECT statement is successfully
# executed using [db eval].
#
# Example:
#
#   do_select_test testcase-1.1 "SELECT 1+1, 1+2" {1 2}
#
# If global variable DO_MALLOC_TEST is set to a non-zero value, or if
# it is not defined at all, then OOM testing is performed on the SELECT
# statement. Each OOM test case is said to pass if either (a) executing
# the SELECT statement succeeds and the results match those specified
# by parameter $result, or (b) TCL throws an "out of memory" error.
#
# If DO_MALLOC_TEST is defined and set to zero, then the SELECT statement
# is executed just once. In this case the test case passes if the results
# match the expected results passed via parameter $result.
#
proc do_select_test {name sql result} {
  doPassiveTest $name $sql [list 0 $result]
}

proc do_error_test {name sql error} {
  doPassiveTest $name $sql [list 1 $error]
}

proc doPassiveTest {name sql catchres} {
  if {![info exists ::DO_MALLOC_TEST]} { set ::DO_MALLOC_TEST 1 }

  if {$::DO_MALLOC_TEST} {
    set answers [list {1 {out of memory}} $catchres]
    set modes [list 100000 transient 1 persistent]
  } else {
    set answers [list $catchres]
    set modes [list 0 nofail]
  }
  set str [join $answers " OR "]

  foreach {nRepeat zName} $modes {
    for {set iFail 1} 1 {incr iFail} {
      if {$::DO_MALLOC_TEST} {sqlite3_memdebug_fail $iFail -repeat $nRepeat}

      set res [catchsql $sql]
      if {[lsearch $answers $res]>=0} {
        set res $str
      }
      do_test $name.$zName.$iFail [list set {} $res] $str
      set nFail [sqlite3_memdebug_fail -1 -benigncnt nBenign]
      if {$nFail==0} break
    }
  }
}


#-------------------------------------------------------------------------
# Test a single write to the database. In this case a  "write" is a 
# DELETE, UPDATE or INSERT statement.
#
# If OOM testing is performed, there are several acceptable outcomes:
#
#   1) The write succeeds. No error is returned.
#
#   2) An "out of memory" exception is thrown and:
#
#     a) The statement has no effect, OR
#     b) The current transaction is rolled back, OR
#     c) The statement succeeds. This can only happen if the connection
#        is in auto-commit mode (after the statement is executed, so this
#        includes COMMIT statements).
#
# If the write operation eventually succeeds, zero is returned. If a
# transaction is rolled back, non-zero is returned.
#
# Parameter $name is the name to use for the test case (or test cases).
# The second parameter, $tbl, should be the name of the database table
# being modified. Parameter $sql contains the SQL statement to test.
#
proc do_write_test {name tbl sql} {
  if {![info exists ::DO_MALLOC_TEST]} { set ::DO_MALLOC_TEST 1 }

  # Figure out an statement to get a checksum for table $tbl.
  db eval "SELECT * FROM $tbl" V break
  set cksumsql "SELECT md5sum([join [concat rowid $V(*)] ,]) FROM $tbl"

  # Calculate the initial table checksum.
  set cksum1 [db one $cksumsql]


  if {$::DO_MALLOC_TEST } {
    set answers [list {1 {out of memory}} {0 {}}]
    set modes [list 100000 transient 1 persistent]
  } else {
    set answers [list {0 {}}]
    set modes [list 0 nofail]
  }
  set str [join $answers " OR "]

  foreach {nRepeat zName} $modes {
    for {set iFail 1} 1 {incr iFail} {
      if {$::DO_MALLOC_TEST} {sqlite3_memdebug_fail $iFail -repeat $nRepeat}

      set res [uplevel [list catchsql $sql]]
      set nFail [sqlite3_memdebug_fail -1 -benigncnt nBenign]
      if {$nFail==0} {
        do_test $name.$zName.$iFail [list set {} $res] {0 {}}
        return
      } else {
        if {[lsearch $answers $res]>=0} {
          set res $str
        }
        do_test $name.$zName.$iFail [list set {} $res] $str
        set cksum2 [db one $cksumsql]
        if {$cksum1 != $cksum2} return
      }
    }
  }
}

  uplevel [list $db eval $sql]
}

# Execute SQL and catch exceptions.
#
proc catchsql {sql {db db}} {
  # puts "SQL = $sql"
  set r [catch {$db eval $sql} msg]
  lappend r $msg
  return $r
}

# Do an VDBE code dump on the SQL given
#
proc explain {sql {db db}} {

  uplevel [list $db eval $sql]
}

# Execute SQL and catch exceptions.
#
proc catchsql {sql {db db}} {
  # puts "SQL = $sql"
  set r [catch [list uplevel [list $db eval $sql]] msg]
  lappend r $msg
  return $r
}

# Do an VDBE code dump on the SQL given
#
proc explain {sql {db db}} {