src/treeview.c

   1 /*
   2 ** 2015-06-08
   3 **
   4 ** The author disclaims copyright to this source code.  In place of
   5 ** a legal notice, here is a blessing:
   6 **
   7 **    May you do good and not evil.
   8 **    May you find forgiveness for yourself and forgive others.
   9 **    May you share freely, never taking more than you give.
  10 **
  11 *************************************************************************
  12 **
  13 ** This file contains C code to implement the TreeView debugging routines.
  14 ** These routines print a parse tree to standard output for debugging and
  15 ** analysis.
  16 **
  17 ** The interfaces in this file is only available when compiling
  18 ** with SQLITE_DEBUG.
  19 */
  20 #include "sqliteInt.h"
  21 #ifdef SQLITE_DEBUG
  22
  23 /*
  24 ** Add a new subitem to the tree.  The moreToFollow flag indicates that this
  25 ** is not the last item in the tree.
  26 */
  27 static TreeView *sqlite3TreeViewPush(TreeView *p, u8 moreToFollow){
  28   if( p==0 ){
  29     p = sqlite3_malloc64( sizeof(*p) );
  30     if( p==0 ) return 0;
  31     memset(p, 0, sizeof(*p));
  32   }else{
  33     p->iLevel++;
  34   }
  35   assert( moreToFollow==0 || moreToFollow==1 );
  36   if( p->iLevel<sizeof(p->bLine) ) p->bLine[p->iLevel] = moreToFollow;
  37   return p;
  38 }
  39
  40 /*
  41 ** Finished with one layer of the tree
  42 */
  43 static void sqlite3TreeViewPop(TreeView *p){
  44   if( p==0 ) return;
  45   p->iLevel--;
  46   if( p->iLevel<0 ) sqlite3_free(p);
  47 }
  48
  49 /*
  50 ** Generate a single line of output for the tree, with a prefix that contains
  51 ** all the appropriate tree lines
  52 */
  53 static void sqlite3TreeViewLine(TreeView *p, const char *zFormat, ...){
  54   va_list ap;
  55   int i;
  56   StrAccum acc;
  57   char zBuf[500];
  58   sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
  59   if( p ){
  60     for(i=0; i<p->iLevel && i<sizeof(p->bLine)-1; i++){
  61       sqlite3_str_append(&acc, p->bLine[i] ? "|   " : "    ", 4);
  62     }
  63     sqlite3_str_append(&acc, p->bLine[i] ? "|-- " : "'-- ", 4);
  64   }
  65   if( zFormat!=0 ){
  66     va_start(ap, zFormat);
  67     sqlite3_str_vappendf(&acc, zFormat, ap);
  68     va_end(ap);
  69     assert( acc.nChar>0 );
  70     sqlite3_str_append(&acc, "\n", 1);
  71   }
  72   sqlite3StrAccumFinish(&acc);
  73   fprintf(stdout,"%s", zBuf);
  74   fflush(stdout);
  75 }
  76
  77 /*
  78 ** Shorthand for starting a new tree item that consists of a single label
  79 */
  80 static void sqlite3TreeViewItem(TreeView *p, const char *zLabel,u8 moreFollows){
  81   p = sqlite3TreeViewPush(p, moreFollows);
  82   sqlite3TreeViewLine(p, "%s", zLabel);
  83 }
  84
  85 /*
  86 ** Generate a human-readable description of a WITH clause.
  87 */
  88 void sqlite3TreeViewWith(TreeView *pView, const With *pWith, u8 moreToFollow){
  89   int i;
  90   if( pWith==0 ) return;
  91   if( pWith->nCte==0 ) return;
  92   if( pWith->pOuter ){
  93     sqlite3TreeViewLine(pView, "WITH (0x%p, pOuter=0x%p)",pWith,pWith->pOuter);
  94   }else{
  95     sqlite3TreeViewLine(pView, "WITH (0x%p)", pWith);
  96   }
  97   if( pWith->nCte>0 ){
  98     pView = sqlite3TreeViewPush(pView, 1);
  99     for(i=0; i<pWith->nCte; i++){
 100       StrAccum x;
 101       char zLine[1000];
 102       const struct Cte *pCte = &pWith->a[i];
 103       sqlite3StrAccumInit(&x, 0, zLine, sizeof(zLine), 0);
 104       sqlite3_str_appendf(&x, "%s", pCte->zName);
 105       if( pCte->pCols && pCte->pCols->nExpr>0 ){
 106         char cSep = '(';
 107         int j;
 108         for(j=0; j<pCte->pCols->nExpr; j++){
 109           sqlite3_str_appendf(&x, "%c%s", cSep, pCte->pCols->a[j].zName);
 110           cSep = ',';
 111         }
 112         sqlite3_str_appendf(&x, ")");
 113       }
 114       sqlite3_str_appendf(&x, " AS");
 115       sqlite3StrAccumFinish(&x);
 116       sqlite3TreeViewItem(pView, zLine, i<pWith->nCte-1);
 117       sqlite3TreeViewSelect(pView, pCte->pSelect, 0);
 118       sqlite3TreeViewPop(pView);
 119     }
 120     sqlite3TreeViewPop(pView);
 121   }
 122 }
 123
 124
 125 /*
 126 ** Generate a human-readable description of a Select object.
 127 */
 128 void sqlite3TreeViewSelect(TreeView *pView, const Select *p, u8 moreToFollow){
 129   int n = 0;
 130   int cnt = 0;
 131   if( p==0 ){
 132     sqlite3TreeViewLine(pView, "nil-SELECT");
 133     return;
 134   }
 135   pView = sqlite3TreeViewPush(pView, moreToFollow);
 136   if( p->pWith ){
 137     sqlite3TreeViewWith(pView, p->pWith, 1);
 138     cnt = 1;
 139     sqlite3TreeViewPush(pView, 1);
 140   }
 141   do{
 142     sqlite3TreeViewLine(pView,
 143       "SELECT%s%s (%u/%p) selFlags=0x%x nSelectRow=%d",
 144       ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
 145       ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""),
 146       p->selId, p, p->selFlags,
 147       (int)p->nSelectRow
 148     );
 149     if( cnt++ ) sqlite3TreeViewPop(pView);
 150     if( p->pPrior ){
 151       n = 1000;
 152     }else{
 153       n = 0;
 154       if( p->pSrc && p->pSrc->nSrc ) n++;
 155       if( p->pWhere ) n++;
 156       if( p->pGroupBy ) n++;
 157       if( p->pHaving ) n++;
 158       if( p->pOrderBy ) n++;
 159       if( p->pLimit ) n++;
 160 #ifndef SQLITE_OMIT_WINDOWFUNC
 161       if( p->pWin ) n++;
 162       if( p->pWinDefn ) n++;
 163 #endif
 164     }
 165     sqlite3TreeViewExprList(pView, p->pEList, (n--)>0, "result-set");
 166 #ifndef SQLITE_OMIT_WINDOWFUNC
 167     if( p->pWin ){
 168       Window *pX;
 169       pView = sqlite3TreeViewPush(pView, (n--)>0);
 170       sqlite3TreeViewLine(pView, "window-functions");
 171       for(pX=p->pWin; pX; pX=pX->pNextWin){
 172         sqlite3TreeViewWinFunc(pView, pX, pX->pNextWin!=0);
 173       }
 174       sqlite3TreeViewPop(pView);
 175     }
 176 #endif
 177     if( p->pSrc && p->pSrc->nSrc ){
 178       int i;
 179       pView = sqlite3TreeViewPush(pView, (n--)>0);
 180       sqlite3TreeViewLine(pView, "FROM");
 181       for(i=0; i<p->pSrc->nSrc; i++){
 182         struct SrcList_item *pItem = &p->pSrc->a[i];
 183         StrAccum x;
 184         char zLine[100];
 185         sqlite3StrAccumInit(&x, 0, zLine, sizeof(zLine), 0);
 186         sqlite3_str_appendf(&x, "{%d,*}", pItem->iCursor);
 187         if( pItem->zDatabase ){
 188           sqlite3_str_appendf(&x, " %s.%s", pItem->zDatabase, pItem->zName);
 189         }else if( pItem->zName ){
 190           sqlite3_str_appendf(&x, " %s", pItem->zName);
 191         }
 192         if( pItem->pTab ){
 193           sqlite3_str_appendf(&x, " tabname=%Q", pItem->pTab->zName);
 194         }
 195         if( pItem->zAlias ){
 196           sqlite3_str_appendf(&x, " (AS %s)", pItem->zAlias);
 197         }
 198         if( pItem->fg.jointype & JT_LEFT ){
 199           sqlite3_str_appendf(&x, " LEFT-JOIN");
 200         }
 201         sqlite3StrAccumFinish(&x);
 202         sqlite3TreeViewItem(pView, zLine, i<p->pSrc->nSrc-1);
 203         if( pItem->pSelect ){
 204           sqlite3TreeViewSelect(pView, pItem->pSelect, 0);
 205         }
 206         if( pItem->fg.isTabFunc ){
 207           sqlite3TreeViewExprList(pView, pItem->u1.pFuncArg, 0, "func-args:");
 208         }
 209         sqlite3TreeViewPop(pView);
 210       }
 211       sqlite3TreeViewPop(pView);
 212     }
 213     if( p->pWhere ){
 214       sqlite3TreeViewItem(pView, "WHERE", (n--)>0);
 215       sqlite3TreeViewExpr(pView, p->pWhere, 0);
 216       sqlite3TreeViewPop(pView);
 217     }
 218     if( p->pGroupBy ){
 219       sqlite3TreeViewExprList(pView, p->pGroupBy, (n--)>0, "GROUPBY");
 220     }
 221     if( p->pHaving ){
 222       sqlite3TreeViewItem(pView, "HAVING", (n--)>0);
 223       sqlite3TreeViewExpr(pView, p->pHaving, 0);
 224       sqlite3TreeViewPop(pView);
 225     }
 226 #ifndef SQLITE_OMIT_WINDOWFUNC
 227     if( p->pWinDefn ){
 228       Window *pX;
 229       sqlite3TreeViewItem(pView, "WINDOW", (n--)>0);
 230       for(pX=p->pWinDefn; pX; pX=pX->pNextWin){
 231         sqlite3TreeViewWindow(pView, pX, pX->pNextWin!=0);
 232       }
 233       sqlite3TreeViewPop(pView);
 234     }
 235 #endif
 236     if( p->pOrderBy ){
 237       sqlite3TreeViewExprList(pView, p->pOrderBy, (n--)>0, "ORDERBY");
 238     }
 239     if( p->pLimit ){
 240       sqlite3TreeViewItem(pView, "LIMIT", (n--)>0);
 241       sqlite3TreeViewExpr(pView, p->pLimit->pLeft, p->pLimit->pRight!=0);
 242       if( p->pLimit->pRight ){
 243         sqlite3TreeViewItem(pView, "OFFSET", (n--)>0);
 244         sqlite3TreeViewExpr(pView, p->pLimit->pRight, 0);
 245         sqlite3TreeViewPop(pView);
 246       }
 247       sqlite3TreeViewPop(pView);
 248     }
 249     if( p->pPrior ){
 250       const char *zOp = "UNION";
 251       switch( p->op ){
 252         case TK_ALL:         zOp = "UNION ALL";  break;
 253         case TK_INTERSECT:   zOp = "INTERSECT";  break;
 254         case TK_EXCEPT:      zOp = "EXCEPT";     break;
 255       }
 256       sqlite3TreeViewItem(pView, zOp, 1);
 257     }
 258     p = p->pPrior;
 259   }while( p!=0 );
 260   sqlite3TreeViewPop(pView);
 261 }
 262
 263 #ifndef SQLITE_OMIT_WINDOWFUNC
 264 /*
 265 ** Generate a description of starting or stopping bounds
 266 */
 267 void sqlite3TreeViewBound(
 268   TreeView *pView,        /* View context */
 269   u8 eBound,              /* UNBOUNDED, CURRENT, PRECEDING, FOLLOWING */
 270   Expr *pExpr,            /* Value for PRECEDING or FOLLOWING */
 271   u8 moreToFollow         /* True if more to follow */
 272 ){
 273   switch( eBound ){
 274     case TK_UNBOUNDED: {
 275       sqlite3TreeViewItem(pView, "UNBOUNDED", moreToFollow);
 276       sqlite3TreeViewPop(pView);
 277       break;
 278     }
 279     case TK_CURRENT: {
 280       sqlite3TreeViewItem(pView, "CURRENT", moreToFollow);
 281       sqlite3TreeViewPop(pView);
 282       break;
 283     }
 284     case TK_PRECEDING: {
 285       sqlite3TreeViewItem(pView, "PRECEDING", moreToFollow);
 286       sqlite3TreeViewExpr(pView, pExpr, 0);
 287       sqlite3TreeViewPop(pView);
 288       break;
 289     }
 290     case TK_FOLLOWING: {
 291       sqlite3TreeViewItem(pView, "FOLLOWING", moreToFollow);
 292       sqlite3TreeViewExpr(pView, pExpr, 0);
 293       sqlite3TreeViewPop(pView);
 294       break;
 295     }
 296   }
 297 }
 298 #endif /* SQLITE_OMIT_WINDOWFUNC */
 299
 300 #ifndef SQLITE_OMIT_WINDOWFUNC
 301 /*
 302 ** Generate a human-readable explanation for a Window object
 303 */
 304 void sqlite3TreeViewWindow(TreeView *pView, const Window *pWin, u8 more){
 305   pView = sqlite3TreeViewPush(pView, more);
 306   if( pWin->zName ){
 307     sqlite3TreeViewLine(pView, "OVER %s", pWin->zName);
 308   }else{
 309     sqlite3TreeViewLine(pView, "OVER");
 310   }
 311   if( pWin->pPartition ){
 312     sqlite3TreeViewExprList(pView, pWin->pPartition, 1, "PARTITION-BY");
 313   }
 314   if( pWin->pOrderBy ){
 315     sqlite3TreeViewExprList(pView, pWin->pOrderBy, 1, "ORDER-BY");
 316   }
 317   if( pWin->eType ){
 318     sqlite3TreeViewItem(pView, pWin->eType==TK_RANGE ? "RANGE" : "ROWS", 0);
 319     sqlite3TreeViewBound(pView, pWin->eStart, pWin->pStart, 1);
 320     sqlite3TreeViewBound(pView, pWin->eEnd, pWin->pEnd, 0);
 321     sqlite3TreeViewPop(pView);
 322   }
 323   sqlite3TreeViewPop(pView);
 324 }
 325 #endif /* SQLITE_OMIT_WINDOWFUNC */
 326
 327 #ifndef SQLITE_OMIT_WINDOWFUNC
 328 /*
 329 ** Generate a human-readable explanation for a Window Function object
 330 */
 331 void sqlite3TreeViewWinFunc(TreeView *pView, const Window *pWin, u8 more){
 332   pView = sqlite3TreeViewPush(pView, more);
 333   sqlite3TreeViewLine(pView, "WINFUNC %s(%d)",
 334                        pWin->pFunc->zName, pWin->pFunc->nArg);
 335   sqlite3TreeViewWindow(pView, pWin, 0);
 336   sqlite3TreeViewPop(pView);
 337 }
 338 #endif /* SQLITE_OMIT_WINDOWFUNC */
 339
 340 /*
 341 ** Generate a human-readable explanation of an expression tree.
 342 */
 343 void sqlite3TreeViewExpr(TreeView *pView, const Expr *pExpr, u8 moreToFollow){
 344   const char *zBinOp = 0;   /* Binary operator */
 345   const char *zUniOp = 0;   /* Unary operator */
 346   char zFlgs[60];
 347   pView = sqlite3TreeViewPush(pView, moreToFollow);
 348   if( pExpr==0 ){
 349     sqlite3TreeViewLine(pView, "nil");
 350     sqlite3TreeViewPop(pView);
 351     return;
 352   }
 353   if( pExpr->flags ){
 354     if( ExprHasProperty(pExpr, EP_FromJoin) ){
 355       sqlite3_snprintf(sizeof(zFlgs),zFlgs,"  flags=0x%x iRJT=%d",
 356                        pExpr->flags, pExpr->iRightJoinTable);
 357     }else{
 358       sqlite3_snprintf(sizeof(zFlgs),zFlgs,"  flags=0x%x",pExpr->flags);
 359     }
 360   }else{
 361     zFlgs[0] = 0;
 362   }
 363   switch( pExpr->op ){
 364     case TK_AGG_COLUMN: {
 365       sqlite3TreeViewLine(pView, "AGG{%d:%d}%s",
 366             pExpr->iTable, pExpr->iColumn, zFlgs);
 367       break;
 368     }
 369     case TK_COLUMN: {
 370       if( pExpr->iTable<0 ){
 371         /* This only happens when coding check constraints */
 372         sqlite3TreeViewLine(pView, "COLUMN(%d)%s", pExpr->iColumn, zFlgs);
 373       }else{
 374         sqlite3TreeViewLine(pView, "{%d:%d}%s",
 375                              pExpr->iTable, pExpr->iColumn, zFlgs);
 376       }
 377       break;
 378     }
 379     case TK_INTEGER: {
 380       if( pExpr->flags & EP_IntValue ){
 381         sqlite3TreeViewLine(pView, "%d", pExpr->u.iValue);
 382       }else{
 383         sqlite3TreeViewLine(pView, "%s", pExpr->u.zToken);
 384       }
 385       break;
 386     }
 387 #ifndef SQLITE_OMIT_FLOATING_POINT
 388     case TK_FLOAT: {
 389       sqlite3TreeViewLine(pView,"%s", pExpr->u.zToken);
 390       break;
 391     }
 392 #endif
 393     case TK_STRING: {
 394       sqlite3TreeViewLine(pView,"%Q", pExpr->u.zToken);
 395       break;
 396     }
 397     case TK_NULL: {
 398       sqlite3TreeViewLine(pView,"NULL");
 399       break;
 400     }
 401     case TK_TRUEFALSE: {
 402       sqlite3TreeViewLine(pView,
 403          sqlite3ExprTruthValue(pExpr) ? "TRUE" : "FALSE");
 404       break;
 405     }
 406 #ifndef SQLITE_OMIT_BLOB_LITERAL
 407     case TK_BLOB: {
 408       sqlite3TreeViewLine(pView,"%s", pExpr->u.zToken);
 409       break;
 410     }
 411 #endif
 412     case TK_VARIABLE: {
 413       sqlite3TreeViewLine(pView,"VARIABLE(%s,%d)",
 414                           pExpr->u.zToken, pExpr->iColumn);
 415       break;
 416     }
 417     case TK_REGISTER: {
 418       sqlite3TreeViewLine(pView,"REGISTER(%d)", pExpr->iTable);
 419       break;
 420     }
 421     case TK_ID: {
 422       sqlite3TreeViewLine(pView,"ID \"%w\"", pExpr->u.zToken);
 423       break;
 424     }
 425 #ifndef SQLITE_OMIT_CAST
 426     case TK_CAST: {
 427       /* Expressions of the form:   CAST(pLeft AS token) */
 428       sqlite3TreeViewLine(pView,"CAST %Q", pExpr->u.zToken);
 429       sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 430       break;
 431     }
 432 #endif /* SQLITE_OMIT_CAST */
 433     case TK_LT:      zBinOp = "LT";     break;
 434     case TK_LE:      zBinOp = "LE";     break;
 435     case TK_GT:      zBinOp = "GT";     break;
 436     case TK_GE:      zBinOp = "GE";     break;
 437     case TK_NE:      zBinOp = "NE";     break;
 438     case TK_EQ:      zBinOp = "EQ";     break;
 439     case TK_IS:      zBinOp = "IS";     break;
 440     case TK_ISNOT:   zBinOp = "ISNOT";  break;
 441     case TK_AND:     zBinOp = "AND";    break;
 442     case TK_OR:      zBinOp = "OR";     break;
 443     case TK_PLUS:    zBinOp = "ADD";    break;
 444     case TK_STAR:    zBinOp = "MUL";    break;
 445     case TK_MINUS:   zBinOp = "SUB";    break;
 446     case TK_REM:     zBinOp = "REM";    break;
 447     case TK_BITAND:  zBinOp = "BITAND"; break;
 448     case TK_BITOR:   zBinOp = "BITOR";  break;
 449     case TK_SLASH:   zBinOp = "DIV";    break;
 450     case TK_LSHIFT:  zBinOp = "LSHIFT"; break;
 451     case TK_RSHIFT:  zBinOp = "RSHIFT"; break;
 452     case TK_CONCAT:  zBinOp = "CONCAT"; break;
 453     case TK_DOT:     zBinOp = "DOT";    break;
 454
 455     case TK_UMINUS:  zUniOp = "UMINUS"; break;
 456     case TK_UPLUS:   zUniOp = "UPLUS";  break;
 457     case TK_BITNOT:  zUniOp = "BITNOT"; break;
 458     case TK_NOT:     zUniOp = "NOT";    break;
 459     case TK_ISNULL:  zUniOp = "ISNULL"; break;
 460     case TK_NOTNULL: zUniOp = "NOTNULL"; break;
 461
 462     case TK_TRUTH: {
 463       int x;
 464       const char *azOp[] = {
 465          "IS-FALSE", "IS-TRUE", "IS-NOT-FALSE", "IS-NOT-TRUE"
 466       };
 467       assert( pExpr->op2==TK_IS || pExpr->op2==TK_ISNOT );
 468       assert( pExpr->pRight );
 469       assert( pExpr->pRight->op==TK_TRUEFALSE );
 470       x = (pExpr->op2==TK_ISNOT)*2 + sqlite3ExprTruthValue(pExpr->pRight);
 471       zUniOp = azOp[x];
 472       break;
 473     }
 474
 475     case TK_SPAN: {
 476       sqlite3TreeViewLine(pView, "SPAN %Q", pExpr->u.zToken);
 477       sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 478       break;
 479     }
 480
 481     case TK_COLLATE: {
 482       sqlite3TreeViewLine(pView, "COLLATE %Q", pExpr->u.zToken);
 483       sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 484       break;
 485     }
 486
 487     case TK_AGG_FUNCTION:
 488     case TK_FUNCTION: {
 489       ExprList *pFarg;       /* List of function arguments */
 490       Window *pWin;
 491       if( ExprHasProperty(pExpr, EP_TokenOnly) ){
 492         pFarg = 0;
 493         pWin = 0;
 494       }else{
 495         pFarg = pExpr->x.pList;
 496 #ifndef SQLITE_OMIT_WINDOWFUNC
 497         pWin = pExpr->pWin;
 498 #else
 499         pWin = 0;
 500 #endif
 501       }
 502       if( pExpr->op==TK_AGG_FUNCTION ){
 503         sqlite3TreeViewLine(pView, "AGG_FUNCTION%d %Q",
 504                              pExpr->op2, pExpr->u.zToken);
 505       }else{
 506         sqlite3TreeViewLine(pView, "FUNCTION %Q", pExpr->u.zToken);
 507       }
 508       if( pFarg ){
 509         sqlite3TreeViewExprList(pView, pFarg, pWin!=0, 0);
 510       }
 511 #ifndef SQLITe_OMIT_WINDOWFUNC
 512       if( pWin ){
 513         sqlite3TreeViewWindow(pView, pWin, 0);
 514       }
 515 #endif
 516       break;
 517     }
 518 #ifndef SQLITE_OMIT_SUBQUERY
 519     case TK_EXISTS: {
 520       sqlite3TreeViewLine(pView, "EXISTS-expr flags=0x%x", pExpr->flags);
 521       sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
 522       break;
 523     }
 524     case TK_SELECT: {
 525       sqlite3TreeViewLine(pView, "SELECT-expr flags=0x%x", pExpr->flags);
 526       sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
 527       break;
 528     }
 529     case TK_IN: {
 530       sqlite3TreeViewLine(pView, "IN flags=0x%x", pExpr->flags);
 531       sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
 532       if( ExprHasProperty(pExpr, EP_xIsSelect) ){
 533         sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
 534       }else{
 535         sqlite3TreeViewExprList(pView, pExpr->x.pList, 0, 0);
 536       }
 537       break;
 538     }
 539 #endif /* SQLITE_OMIT_SUBQUERY */
 540
 541     /*
 542     **    x BETWEEN y AND z
 543     **
 544     ** This is equivalent to
 545     **
 546     **    x>=y AND x<=z
 547     **
 548     ** X is stored in pExpr->pLeft.
 549     ** Y is stored in pExpr->pList->a[0].pExpr.
 550     ** Z is stored in pExpr->pList->a[1].pExpr.
 551     */
 552     case TK_BETWEEN: {
 553       Expr *pX = pExpr->pLeft;
 554       Expr *pY = pExpr->x.pList->a[0].pExpr;
 555       Expr *pZ = pExpr->x.pList->a[1].pExpr;
 556       sqlite3TreeViewLine(pView, "BETWEEN");
 557       sqlite3TreeViewExpr(pView, pX, 1);
 558       sqlite3TreeViewExpr(pView, pY, 1);
 559       sqlite3TreeViewExpr(pView, pZ, 0);
 560       break;
 561     }
 562     case TK_TRIGGER: {
 563       /* If the opcode is TK_TRIGGER, then the expression is a reference
 564       ** to a column in the new.* or old.* pseudo-tables available to
 565       ** trigger programs. In this case Expr.iTable is set to 1 for the
 566       ** new.* pseudo-table, or 0 for the old.* pseudo-table. Expr.iColumn
 567       ** is set to the column of the pseudo-table to read, or to -1 to
 568       ** read the rowid field.
 569       */
 570       sqlite3TreeViewLine(pView, "%s(%d)",
 571           pExpr->iTable ? "NEW" : "OLD", pExpr->iColumn);
 572       break;
 573     }
 574     case TK_CASE: {
 575       sqlite3TreeViewLine(pView, "CASE");
 576       sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
 577       sqlite3TreeViewExprList(pView, pExpr->x.pList, 0, 0);
 578       break;
 579     }
 580 #ifndef SQLITE_OMIT_TRIGGER
 581     case TK_RAISE: {
 582       const char *zType = "unk";
 583       switch( pExpr->affinity ){
 584         case OE_Rollback:   zType = "rollback";  break;
 585         case OE_Abort:      zType = "abort";     break;
 586         case OE_Fail:       zType = "fail";      break;
 587         case OE_Ignore:     zType = "ignore";    break;
 588       }
 589       sqlite3TreeViewLine(pView, "RAISE %s(%Q)", zType, pExpr->u.zToken);
 590       break;
 591     }
 592 #endif
 593     case TK_MATCH: {
 594       sqlite3TreeViewLine(pView, "MATCH {%d:%d}%s",
 595                           pExpr->iTable, pExpr->iColumn, zFlgs);
 596       sqlite3TreeViewExpr(pView, pExpr->pRight, 0);
 597       break;
 598     }
 599     case TK_VECTOR: {
 600       sqlite3TreeViewBareExprList(pView, pExpr->x.pList, "VECTOR");
 601       break;
 602     }
 603     case TK_SELECT_COLUMN: {
 604       sqlite3TreeViewLine(pView, "SELECT-COLUMN %d", pExpr->iColumn);
 605       sqlite3TreeViewSelect(pView, pExpr->pLeft->x.pSelect, 0);
 606       break;
 607     }
 608     case TK_IF_NULL_ROW: {
 609       sqlite3TreeViewLine(pView, "IF-NULL-ROW %d", pExpr->iTable);
 610       sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 611       break;
 612     }
 613     default: {
 614       sqlite3TreeViewLine(pView, "op=%d", pExpr->op);
 615       break;
 616     }
 617   }
 618   if( zBinOp ){
 619     sqlite3TreeViewLine(pView, "%s%s", zBinOp, zFlgs);
 620     sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
 621     sqlite3TreeViewExpr(pView, pExpr->pRight, 0);
 622   }else if( zUniOp ){
 623     sqlite3TreeViewLine(pView, "%s%s", zUniOp, zFlgs);
 624     sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
 625   }
 626   sqlite3TreeViewPop(pView);
 627 }
 628
 629
 630 /*
 631 ** Generate a human-readable explanation of an expression list.
 632 */
 633 void sqlite3TreeViewBareExprList(
 634   TreeView *pView,
 635   const ExprList *pList,
 636   const char *zLabel
 637 ){
 638   if( zLabel==0 || zLabel[0]==0 ) zLabel = "LIST";
 639   if( pList==0 ){
 640     sqlite3TreeViewLine(pView, "%s (empty)", zLabel);
 641   }else{
 642     int i;
 643     sqlite3TreeViewLine(pView, "%s", zLabel);
 644     for(i=0; i<pList->nExpr; i++){
 645       int j = pList->a[i].u.x.iOrderByCol;
 646       char *zName = pList->a[i].zName;
 647       int moreToFollow = i<pList->nExpr - 1;
 648       if( j || zName ){
 649         sqlite3TreeViewPush(pView, moreToFollow);
 650         moreToFollow = 0;
 651         sqlite3TreeViewLine(pView, 0);
 652         if( zName ){
 653           fprintf(stdout, "AS %s ", zName);
 654         }
 655         if( j ){
 656           fprintf(stdout, "iOrderByCol=%d", j);
 657         }
 658         fprintf(stdout, "\n");
 659         fflush(stdout);
 660       }
 661       sqlite3TreeViewExpr(pView, pList->a[i].pExpr, moreToFollow);
 662       if( j || zName ){
 663         sqlite3TreeViewPop(pView);
 664       }
 665     }
 666   }
 667 }
 668 void sqlite3TreeViewExprList(
 669   TreeView *pView,
 670   const ExprList *pList,
 671   u8 moreToFollow,
 672   const char *zLabel
 673 ){
 674   pView = sqlite3TreeViewPush(pView, moreToFollow);
 675   sqlite3TreeViewBareExprList(pView, pList, zLabel);
 676   sqlite3TreeViewPop(pView);
 677 }
 678
 679 #endif /* SQLITE_DEBUG */