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Commit770352d

Browse files
author
Thomas G. Lockhart
committed
Add support for SQL92 delimited identifiers.
Add support for SQL3 IS TRUE and IS FALSE.Augment support for SQL92 SET TIME ZONE...
1 parent0a9be2d commit770352d

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1 file changed

+76
-23
lines changed

1 file changed

+76
-23
lines changed

‎src/backend/parser/gram.y‎

Lines changed: 76 additions & 23 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
*
1111
*
1212
* IDENTIFICATION
13-
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.59 1997/10/28 14:56:08 vadim Exp $
13+
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.60 1997/10/30 16:39:27 thomas Exp $
1414
*
1515
* HISTORY
1616
* AUTHORDATEMAJOR EVENT
@@ -63,6 +63,7 @@ static char *xlateSqlType(char *);
6363
static Node *makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr);
6464
static List *makeConstantList( A_Const *node);
6565
static char *FlattenStringList(List *list);
66+
static char *fmtId(char *rawid);
6667

6768
/* old versions of flex define this as a macro */
6869
#if defined(yywrap)
@@ -400,6 +401,12 @@ VariableShowStmt: SHOW ColId
400401
n->name = $2;
401402
$$ = (Node *) n;
402403
}
404+
| SHOW TIME ZONE
405+
{
406+
VariableShowStmt *n = makeNode(VariableShowStmt);
407+
n->name = "timezone";
408+
$$ = (Node *) n;
409+
}
403410
;
404411

405412
VariableResetStmt:RESET ColId
@@ -408,6 +415,12 @@ VariableResetStmt:RESET ColId
408415
n->name = $2;
409416
$$ = (Node *) n;
410417
}
418+
| RESET TIME ZONE
419+
{
420+
VariableResetStmt *n = makeNode(VariableResetStmt);
421+
n->name = "timezone";
422+
$$ = (Node *) n;
423+
}
411424
;
412425

413426

@@ -498,11 +511,13 @@ default_expr: AexprConst
498511
{$$ = lcons( makeString( "|"), $2); }
499512
| default_expr TYPECAST Typename
500513
{
501-
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
514+
$3->name = fmtId($3->name);
515+
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
502516
}
503517
| CAST default_expr AS Typename
504518
{
505-
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
519+
$4->name = fmtId($4->name);
520+
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
506521
}
507522
| '(' default_expr ')'
508523
{$$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
@@ -714,7 +729,7 @@ ConstraintList:
714729
ConstraintElem:
715730
CONSTRAINT name ConstraintDef
716731
{
717-
$3->name =$2;
732+
$3->name =fmtId($2);
718733
$$ = $3;
719734
}
720735
| ConstraintDef{ $$ = $1; }
@@ -751,7 +766,7 @@ constraint_elem: AexprConst
751766
#ifdef PARSEDEBUG
752767
printf( "ColId is %s\n", $1);
753768
#endif
754-
$$ = lcons( makeString($1), NIL);
769+
$$ = lcons( makeString(fmtId($1)), NIL);
755770
}
756771
| '-' constraint_elem %prec UMINUS
757772
{$$ = lcons( makeString( "-"), $2); }
@@ -777,11 +792,13 @@ printf( "ColId is %s\n", $1);
777792
{$$ = lcons( makeString( "|"), $2); }
778793
| constraint_elem TYPECAST Typename
779794
{
780-
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
795+
$3->name = fmtId($3->name);
796+
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
781797
}
782798
| CAST constraint_elem AS Typename
783799
{
784-
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
800+
$4->name = fmtId($4->name);
801+
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
785802
}
786803
| '(' constraint_elem ')'
787804
{$$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
@@ -801,6 +818,14 @@ printf( "ColId is %s\n", $1);
801818
{$$ = lcons( makeString( $1), $2); }
802819
| constraint_elem Op
803820
{$$ = lappend( $1, makeString( $2)); }
821+
| constraint_elem IS TRUE_P
822+
{$$ = lappend( $1, makeString( "IS TRUE")); }
823+
| constraint_elem IS FALSE_P
824+
{$$ = lappend( $1, makeString( "IS FALSE")); }
825+
| constraint_elem IS NOT TRUE_P
826+
{$$ = lappend( $1, makeString( "IS NOT TRUE")); }
827+
| constraint_elem IS NOT FALSE_P
828+
{$$ = lappend( $1, makeString( "IS NOT FALSE")); }
804829
;
805830

806831
key_match: MATCH FULL{ $$ = NULL; }
@@ -2933,31 +2958,31 @@ a_expr: attr opt_indirection
29332958
{$$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
29342959
| a_expr IS TRUE_P
29352960
{
2936-
A_Const *n = makeNode(A_Const);
2937-
n->val.type =T_String;
2938-
n->val.val.str ="t";
2939-
$$ =makeA_Expr(OP, "=", $1, (Node *)n);
2961+
FuncCall *n = makeNode(FuncCall);
2962+
n->funcname ="istrue";
2963+
n->args =lcons($1,NIL);
2964+
$$ =(Node *)n;
29402965
}
29412966
| a_expr IS FALSE_P
29422967
{
2943-
A_Const *n = makeNode(A_Const);
2944-
n->val.type =T_String;
2945-
n->val.val.str ="f";
2946-
$$ =makeA_Expr(OP, "=", $1, (Node *)n);
2968+
FuncCall *n = makeNode(FuncCall);
2969+
n->funcname ="isfalse";
2970+
n->args =lcons($1,NIL);
2971+
$$ =(Node *)n;
29472972
}
29482973
| a_expr IS NOT TRUE_P
29492974
{
2950-
A_Const *n = makeNode(A_Const);
2951-
n->val.type =T_String;
2952-
n->val.val.str ="f";
2953-
$$ =makeA_Expr(OP, "=", $1, (Node *)n);
2975+
FuncCall *n = makeNode(FuncCall);
2976+
n->funcname ="isfalse";
2977+
n->args =lcons($1,NIL);
2978+
$$ =(Node *)n;
29542979
}
29552980
| a_expr IS NOT FALSE_P
29562981
{
2957-
A_Const *n = makeNode(A_Const);
2958-
n->val.type =T_String;
2959-
n->val.val.str ="t";
2960-
$$ =makeA_Expr(OP, "=", $1, (Node *)n);
2982+
FuncCall *n = makeNode(FuncCall);
2983+
n->funcname ="istrue";
2984+
n->args =lcons($1,NIL);
2985+
$$ =(Node *)n;
29612986
}
29622987
| a_expr BETWEEN AexprConst AND AexprConst
29632988
{
@@ -3636,3 +3661,31 @@ printf( "AexprConst argument is \"%s\"\n", defval);
36363661

36373662
return( lcons( makeString(defval), NIL));
36383663
} /* makeConstantList() */
3664+
3665+
/* fmtId()
3666+
* Check input string for non-lowercase/non-numeric characters.
3667+
* Returns either input string or input surrounded by double quotes.
3668+
*/
3669+
static char *
3670+
fmtId(char *rawid)
3671+
{
3672+
static char *cp;
3673+
3674+
for (cp = rawid; *cp != '\0'; cp++)
3675+
if (! (islower(*cp) || isdigit(*cp) || (*cp == '_'))) break;
3676+
3677+
if (*cp != '\0') {
3678+
cp = palloc(strlen(rawid)+1);
3679+
strcpy(cp,"\"");
3680+
strcat(cp,rawid);
3681+
strcat(cp,"\"");
3682+
} else {
3683+
cp = rawid;
3684+
};
3685+
3686+
#ifdef PARSEDEBUG
3687+
printf("fmtId- %sconvert %s to %s\n", ((cp == rawid)? "do not ": ""), rawid, cp);
3688+
#endif
3689+
3690+
return(cp);
3691+
} /* fmtId() */

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