/** Comparison operator */
public void operatorCompare(
HplsqlParser.Bool_expr_binaryContext ctx, HplsqlParser.Bool_expr_binary_operatorContext op) {
Var v1 = evalPop(ctx.expr(0));
Var v2 = evalPop(ctx.expr(1));
int cmp = v1.compareTo(v2);
boolean bool = false;
if (op.T_GREATER() != null) {
if (cmp > 0) {
bool = true;
}
} else if (op.T_GREATEREQUAL() != null) {
if (cmp >= 0) {
bool = true;
}
}
if (op.T_LESS() != null) {
if (cmp < 0) {
bool = true;
}
} else if (op.T_LESSEQUAL() != null) {
if (cmp <= 0) {
bool = true;
}
}
exec.stackPush(bool);
}
/** Unary boolean expression */
public Integer execBoolUnary(HplsqlParser.Bool_expr_unaryContext ctx) {
boolean val = false;
if (ctx.T_IS() != null) {
val = evalPop(ctx.expr(0)).isNull();
if (ctx.T_NOT() != null) {
val = !val;
}
} else if (ctx.T_BETWEEN() != null) {
Var v = evalPop(ctx.expr(0));
Var v1 = evalPop(ctx.expr(1));
int cmp = v.compareTo(v1);
if (cmp >= 0) {
Var v2 = evalPop(ctx.expr(2));
cmp = v.compareTo(v2);
if (cmp <= 0) {
val = true;
}
}
}
exec.stackPush(val);
return 0;
}
/** Simple CASE expression */
public void execSimpleCase(HplsqlParser.Expr_case_simpleContext ctx) {
int i = 1;
int cnt = ctx.expr().size();
boolean found = false;
Var val = evalPop(ctx.expr(0));
while (i < cnt) {
Var when = evalPop(ctx.expr(i));
if (val.compareTo(when) == 0) {
visit(ctx.expr(i + 1));
found = true;
break;
}
i += 2;
}
if (!found) {
if (ctx.T_ELSE() != null) {
visit(ctx.expr(cnt - 1));
} else {
evalNull();
}
}
}
