333 lines
8.8 KiB
C
333 lines
8.8 KiB
C
/*
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** 2006 June 13
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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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** Code for testing the virtual table interfaces. This code
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** is not included in the SQLite library. It is used for automated
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** testing of the SQLite library.
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**
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** The emphasis of this file is a virtual table that provides
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** access to TCL variables.
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*/
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#include "sqliteInt.h"
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#include "tcl.h"
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#include <stdlib.h>
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#include <string.h>
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#ifndef SQLITE_OMIT_VIRTUALTABLE
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typedef struct tclvar_vtab tclvar_vtab;
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typedef struct tclvar_cursor tclvar_cursor;
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/*
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** A tclvar virtual-table object
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*/
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struct tclvar_vtab {
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sqlite3_vtab base;
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Tcl_Interp *interp;
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};
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/* A tclvar cursor object */
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struct tclvar_cursor {
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sqlite3_vtab_cursor base;
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Tcl_Obj *pList1; /* Result of [info vars ?pattern?] */
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Tcl_Obj *pList2; /* Result of [array names [lindex $pList1 $i1]] */
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int i1; /* Current item in pList1 */
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int i2; /* Current item (if any) in pList2 */
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};
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/* Methods for the tclvar module */
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static int tclvarConnect(
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sqlite3 *db,
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void *pAux,
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int argc, const char *const*argv,
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sqlite3_vtab **ppVtab,
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char **pzErr
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){
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tclvar_vtab *pVtab;
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static const char zSchema[] =
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"CREATE TABLE whatever(name TEXT, arrayname TEXT, value TEXT)";
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pVtab = sqlite3MallocZero( sizeof(*pVtab) );
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if( pVtab==0 ) return SQLITE_NOMEM;
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*ppVtab = &pVtab->base;
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pVtab->interp = (Tcl_Interp *)pAux;
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sqlite3_declare_vtab(db, zSchema);
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return SQLITE_OK;
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}
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/* Note that for this virtual table, the xCreate and xConnect
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** methods are identical. */
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static int tclvarDisconnect(sqlite3_vtab *pVtab){
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sqlite3_free(pVtab);
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return SQLITE_OK;
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}
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/* The xDisconnect and xDestroy methods are also the same */
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/*
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** Open a new tclvar cursor.
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*/
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static int tclvarOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
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tclvar_cursor *pCur;
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pCur = sqlite3MallocZero(sizeof(tclvar_cursor));
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*ppCursor = &pCur->base;
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return SQLITE_OK;
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}
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/*
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** Close a tclvar cursor.
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*/
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static int tclvarClose(sqlite3_vtab_cursor *cur){
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tclvar_cursor *pCur = (tclvar_cursor *)cur;
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if( pCur->pList1 ){
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Tcl_DecrRefCount(pCur->pList1);
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}
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if( pCur->pList2 ){
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Tcl_DecrRefCount(pCur->pList2);
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}
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sqlite3_free(pCur);
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return SQLITE_OK;
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}
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/*
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** Returns 1 if data is ready, or 0 if not.
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*/
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static int next2(Tcl_Interp *interp, tclvar_cursor *pCur, Tcl_Obj *pObj){
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Tcl_Obj *p;
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if( pObj ){
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if( !pCur->pList2 ){
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p = Tcl_NewStringObj("array names", -1);
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Tcl_IncrRefCount(p);
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Tcl_ListObjAppendElement(0, p, pObj);
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Tcl_EvalObjEx(interp, p, TCL_EVAL_GLOBAL);
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Tcl_DecrRefCount(p);
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pCur->pList2 = Tcl_GetObjResult(interp);
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Tcl_IncrRefCount(pCur->pList2);
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assert( pCur->i2==0 );
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}else{
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int n = 0;
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pCur->i2++;
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Tcl_ListObjLength(0, pCur->pList2, &n);
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if( pCur->i2>=n ){
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Tcl_DecrRefCount(pCur->pList2);
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pCur->pList2 = 0;
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pCur->i2 = 0;
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return 0;
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}
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}
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}
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return 1;
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}
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static int tclvarNext(sqlite3_vtab_cursor *cur){
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Tcl_Obj *pObj;
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int n = 0;
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int ok = 0;
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tclvar_cursor *pCur = (tclvar_cursor *)cur;
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Tcl_Interp *interp = ((tclvar_vtab *)(cur->pVtab))->interp;
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Tcl_ListObjLength(0, pCur->pList1, &n);
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while( !ok && pCur->i1<n ){
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Tcl_ListObjIndex(0, pCur->pList1, pCur->i1, &pObj);
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ok = next2(interp, pCur, pObj);
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if( !ok ){
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pCur->i1++;
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}
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}
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return 0;
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}
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static int tclvarFilter(
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sqlite3_vtab_cursor *pVtabCursor,
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int idxNum, const char *idxStr,
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int argc, sqlite3_value **argv
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){
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tclvar_cursor *pCur = (tclvar_cursor *)pVtabCursor;
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Tcl_Interp *interp = ((tclvar_vtab *)(pVtabCursor->pVtab))->interp;
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Tcl_Obj *p = Tcl_NewStringObj("info vars", -1);
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Tcl_IncrRefCount(p);
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assert( argc==0 || argc==1 );
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if( argc==1 ){
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Tcl_Obj *pArg = Tcl_NewStringObj((char*)sqlite3_value_text(argv[0]), -1);
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Tcl_ListObjAppendElement(0, p, pArg);
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}
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Tcl_EvalObjEx(interp, p, TCL_EVAL_GLOBAL);
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if( pCur->pList1 ){
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Tcl_DecrRefCount(pCur->pList1);
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}
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if( pCur->pList2 ){
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Tcl_DecrRefCount(pCur->pList2);
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pCur->pList2 = 0;
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}
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pCur->i1 = 0;
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pCur->i2 = 0;
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pCur->pList1 = Tcl_GetObjResult(interp);
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Tcl_IncrRefCount(pCur->pList1);
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assert( pCur->i1==0 && pCur->i2==0 && pCur->pList2==0 );
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Tcl_DecrRefCount(p);
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return tclvarNext(pVtabCursor);
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}
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static int tclvarColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
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Tcl_Obj *p1;
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Tcl_Obj *p2;
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const char *z1;
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const char *z2 = "";
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tclvar_cursor *pCur = (tclvar_cursor*)cur;
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Tcl_Interp *interp = ((tclvar_vtab *)cur->pVtab)->interp;
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Tcl_ListObjIndex(interp, pCur->pList1, pCur->i1, &p1);
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Tcl_ListObjIndex(interp, pCur->pList2, pCur->i2, &p2);
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z1 = Tcl_GetString(p1);
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if( p2 ){
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z2 = Tcl_GetString(p2);
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}
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switch (i) {
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case 0: {
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sqlite3_result_text(ctx, z1, -1, SQLITE_TRANSIENT);
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break;
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}
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case 1: {
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sqlite3_result_text(ctx, z2, -1, SQLITE_TRANSIENT);
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break;
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}
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case 2: {
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Tcl_Obj *pVal = Tcl_GetVar2Ex(interp, z1, *z2?z2:0, TCL_GLOBAL_ONLY);
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sqlite3_result_text(ctx, Tcl_GetString(pVal), -1, SQLITE_TRANSIENT);
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break;
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}
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}
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return SQLITE_OK;
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}
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static int tclvarRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
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*pRowid = 0;
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return SQLITE_OK;
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}
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static int tclvarEof(sqlite3_vtab_cursor *cur){
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tclvar_cursor *pCur = (tclvar_cursor*)cur;
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return (pCur->pList2?0:1);
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}
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static int tclvarBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
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int ii;
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for(ii=0; ii<pIdxInfo->nConstraint; ii++){
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struct sqlite3_index_constraint const *pCons = &pIdxInfo->aConstraint[ii];
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if( pCons->iColumn==0 && pCons->usable
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&& pCons->op==SQLITE_INDEX_CONSTRAINT_EQ ){
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struct sqlite3_index_constraint_usage *pUsage;
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pUsage = &pIdxInfo->aConstraintUsage[ii];
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pUsage->omit = 0;
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pUsage->argvIndex = 1;
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return SQLITE_OK;
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}
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}
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for(ii=0; ii<pIdxInfo->nConstraint; ii++){
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struct sqlite3_index_constraint const *pCons = &pIdxInfo->aConstraint[ii];
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if( pCons->iColumn==0 && pCons->usable
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&& pCons->op==SQLITE_INDEX_CONSTRAINT_MATCH ){
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struct sqlite3_index_constraint_usage *pUsage;
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pUsage = &pIdxInfo->aConstraintUsage[ii];
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pUsage->omit = 1;
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pUsage->argvIndex = 1;
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return SQLITE_OK;
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}
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}
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return SQLITE_OK;
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}
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/*
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** A virtual table module that provides read-only access to a
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** Tcl global variable namespace.
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*/
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static sqlite3_module tclvarModule = {
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0, /* iVersion */
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tclvarConnect,
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tclvarConnect,
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tclvarBestIndex,
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tclvarDisconnect,
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tclvarDisconnect,
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tclvarOpen, /* xOpen - open a cursor */
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tclvarClose, /* xClose - close a cursor */
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tclvarFilter, /* xFilter - configure scan constraints */
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tclvarNext, /* xNext - advance a cursor */
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tclvarEof, /* xEof - check for end of scan */
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tclvarColumn, /* xColumn - read data */
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tclvarRowid, /* xRowid - read data */
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0, /* xUpdate */
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0, /* xBegin */
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0, /* xSync */
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0, /* xCommit */
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0, /* xRollback */
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0, /* xFindMethod */
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0, /* xRename */
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};
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/*
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** Decode a pointer to an sqlite3 object.
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*/
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extern int getDbPointer(Tcl_Interp *interp, const char *zA, sqlite3 **ppDb);
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/*
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** Register the echo virtual table module.
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*/
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static int register_tclvar_module(
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ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
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Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
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int objc, /* Number of arguments */
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Tcl_Obj *CONST objv[] /* Command arguments */
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){
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sqlite3 *db;
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if( objc!=2 ){
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Tcl_WrongNumArgs(interp, 1, objv, "DB");
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return TCL_ERROR;
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}
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if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
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#ifndef SQLITE_OMIT_VIRTUALTABLE
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sqlite3_create_module(db, "tclvar", &tclvarModule, (void *)interp);
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#endif
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return TCL_OK;
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}
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#endif
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/*
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** Register commands with the TCL interpreter.
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*/
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int Sqlitetesttclvar_Init(Tcl_Interp *interp){
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#ifndef SQLITE_OMIT_VIRTUALTABLE
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static struct {
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char *zName;
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Tcl_ObjCmdProc *xProc;
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void *clientData;
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} aObjCmd[] = {
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{ "register_tclvar_module", register_tclvar_module, 0 },
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};
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int i;
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for(i=0; i<sizeof(aObjCmd)/sizeof(aObjCmd[0]); i++){
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Tcl_CreateObjCommand(interp, aObjCmd[i].zName,
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aObjCmd[i].xProc, aObjCmd[i].clientData, 0);
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}
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#endif
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return TCL_OK;
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}
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