/// <summary>
/// Balances the binary trees within the expression.
/// </summary>
/// <returns>The balanced expression.</returns>
public IExpression Balance()
{
if (_balanced)
{
return(this);
}
if (!BalanceOps.TryGetValue(Operator, out CompoundOperator inverseOp))
{
return(new CompoundExpression(Operator, First.Balance(), Second.Balance(), true));
}
List <IExpression> chain = new List <IExpression>();
GetChainedValues(this, chain);
return(Rebuild(chain, Operator, inverseOp));
}