private GExpr.Expr or()
{
GExpr.Expr expr = and();
while (Match(tt.OR))
{
Token op = previous();
GExpr.Expr right = and();
expr = new GExpr.Logical(expr, op, right);
}
return(expr);
}
private GExpr.Expr and()
{
GExpr.Expr expr = equality();
while (Match(tt.AND))
{
Token op = previous();
GExpr.Expr right = equality();
expr = new GExpr.Logical(expr, op, right);
}
return(expr);
}
public Object visit_Logical_Expr(GExpr.Logical expr)
{
Object left = evaluate(expr.left);
if (expr.Operator.type == tt.OR)
{
if (isTruthy(left))
{
return(left);
}
}
else
{
if (!isTruthy(left))
{
return(left);
}
}
return(evaluate(expr.right));
}