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Add support for SQL92 delimited identifiers. 

Add support for SQL3 IS TRUE and IS FALSE.
Augment support for SQL92 SET TIME ZONE...
This commit is contained in:
Thomas G. Lockhart 1997-10-30 16:39:27 +00:00
parent 0a9be2db9b
commit 770352d279
1 changed files with 76 additions and 23 deletions
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99
src/backend/parser/gram.y
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.59 1997/10/28 14:56:08 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.60 1997/10/30 16:39:27 thomas Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -63,6 +63,7 @@ static char *xlateSqlType(char *);
static Node *makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr);
static List *makeConstantList( A_Const *node);
static char *FlattenStringList(List *list);
static char *fmtId(char *rawid);
/* old versions of flex define this as a macro */
#if defined(yywrap)
@ -400,6 +401,12 @@ VariableShowStmt: SHOW ColId
n->name = $2;
$$ = (Node *) n;
}
| SHOW TIME ZONE
{
VariableShowStmt *n = makeNode(VariableShowStmt);
n->name = "timezone";
$$ = (Node *) n;
}
;
VariableResetStmt: RESET ColId
@ -408,6 +415,12 @@ VariableResetStmt: RESET ColId
n->name = $2;
$$ = (Node *) n;
}
| RESET TIME ZONE
{
VariableResetStmt *n = makeNode(VariableResetStmt);
n->name = "timezone";
$$ = (Node *) n;
}
;
@ -498,11 +511,13 @@ default_expr: AexprConst
{ $$ = lcons( makeString( "|"), $2); }
| default_expr TYPECAST Typename
{
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
$3->name = fmtId($3->name);
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
}
| CAST default_expr AS Typename
{
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
$4->name = fmtId($4->name);
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
}
| '(' default_expr ')'
{ $$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
@ -714,7 +729,7 @@ ConstraintList:
ConstraintElem:
CONSTRAINT name ConstraintDef
{
$3->name = $2;
$3->name = fmtId($2);
$$ = $3;
}
| ConstraintDef { $$ = $1; }
@ -751,7 +766,7 @@ constraint_elem: AexprConst
#ifdef PARSEDEBUG
printf( "ColId is %s\n", $1);
#endif
$$ = lcons( makeString($1), NIL);
$$ = lcons( makeString(fmtId($1)), NIL);
}
| '-' constraint_elem %prec UMINUS
{ $$ = lcons( makeString( "-"), $2); }
@ -777,11 +792,13 @@ printf( "ColId is %s\n", $1);
{ $$ = lcons( makeString( "|"), $2); }
| constraint_elem TYPECAST Typename
{
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
$3->name = fmtId($3->name);
$$ = nconc( lcons( makeString( "CAST"), $1), makeList( makeString("AS"), $3, -1));
}
| CAST constraint_elem AS Typename
{
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
$4->name = fmtId($4->name);
$$ = nconc( lcons( makeString( "CAST"), $2), makeList( makeString("AS"), $4, -1));
}
| '(' constraint_elem ')'
{ $$ = lappend( lcons( makeString( "("), $2), makeString( ")")); }
@ -801,6 +818,14 @@ printf( "ColId is %s\n", $1);
{ $$ = lcons( makeString( $1), $2); }
| constraint_elem Op
{ $$ = lappend( $1, makeString( $2)); }
| constraint_elem IS TRUE_P
{ $$ = lappend( $1, makeString( "IS TRUE")); }
| constraint_elem IS FALSE_P
{ $$ = lappend( $1, makeString( "IS FALSE")); }
| constraint_elem IS NOT TRUE_P
{ $$ = lappend( $1, makeString( "IS NOT TRUE")); }
| constraint_elem IS NOT FALSE_P
{ $$ = lappend( $1, makeString( "IS NOT FALSE")); }
;
key_match: MATCH FULL { $$ = NULL; }
@ -2933,31 +2958,31 @@ a_expr: attr opt_indirection
{ $$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
| a_expr IS TRUE_P
{
A_Const *n = makeNode(A_Const);
n->val.type = T_String;
n->val.val.str = "t";
$$ = makeA_Expr(OP, "=", $1, (Node *)n);
FuncCall *n = makeNode(FuncCall);
n->funcname = "istrue";
n->args = lcons($1,NIL);
$$ = (Node *)n;
}
| a_expr IS FALSE_P
{
A_Const *n = makeNode(A_Const);
n->val.type = T_String;
n->val.val.str = "f";
$$ = makeA_Expr(OP, "=", $1, (Node *)n);
FuncCall *n = makeNode(FuncCall);
n->funcname = "isfalse";
n->args = lcons($1,NIL);
$$ = (Node *)n;
}
| a_expr IS NOT TRUE_P
{
A_Const *n = makeNode(A_Const);
n->val.type = T_String;
n->val.val.str = "f";
$$ = makeA_Expr(OP, "=", $1, (Node *)n);
FuncCall *n = makeNode(FuncCall);
n->funcname = "isfalse";
n->args = lcons($1,NIL);
$$ = (Node *)n;
}
| a_expr IS NOT FALSE_P
{
A_Const *n = makeNode(A_Const);
n->val.type = T_String;
n->val.val.str = "t";
$$ = makeA_Expr(OP, "=", $1, (Node *)n);
FuncCall *n = makeNode(FuncCall);
n->funcname = "istrue";
n->args = lcons($1,NIL);
$$ = (Node *)n;
}
| a_expr BETWEEN AexprConst AND AexprConst
{
@ -3636,3 +3661,31 @@ printf( "AexprConst argument is \"%s\"\n", defval);
return( lcons( makeString(defval), NIL));
} /* makeConstantList() */
/* fmtId()
* Check input string for non-lowercase/non-numeric characters.
* Returns either input string or input surrounded by double quotes.
*/
static char *
fmtId(char *rawid)
{
static char *cp;
for (cp = rawid; *cp != '\0'; cp++)
if (! (islower(*cp) || isdigit(*cp) || (*cp == '_'))) break;
if (*cp != '\0') {
cp = palloc(strlen(rawid)+1);
strcpy(cp,"\"");
strcat(cp,rawid);
strcat(cp,"\"");
} else {
cp = rawid;
};
#ifdef PARSEDEBUG
printf("fmtId- %sconvert %s to %s\n", ((cp == rawid)? "do not ": ""), rawid, cp);
#endif
return(cp);
} /* fmtId() */