public string ReplaceFinalOperator(Symbol newOp)
{
if (string.IsNullOrEmpty(_equation))
{
return newOp.ToString();
}
return _equation.TrimEnd(Operators.ToArray()) + newOp.ToString();
}
public static NegativeSign Produce(Symbol symbol)
{
// neg-sign = minus
if (symbol is Minus)
{
return new NegativeSign(symbol);
}
return null;
}
public static PrefixOperator Produce(Symbol symbol)
{
// prefix-operator = plus / minus
if (symbol is Plus || symbol is Minus)
{
return new PrefixOperator(symbol);
}
return null;
}
public static InfixOperator Produce(Symbol symbol)
{
// infix-operator = caret / asterisk / forward-slash / plus / minus
if (symbol is Plus || symbol is Minus || symbol is Asterisk ||
symbol is ForwardSlash || symbol is Caret)
{
return new InfixOperator(symbol);
}
return null;
}
private static void inspectRecursive(StringBuilder sb, Symbol symbol,
int depth)
{
sb.AppendLine(string.Format("{0}{1}: {2}",
"".PadRight(depth * 2),
symbol.GetType().Name,
symbol.ToString()));
foreach (var childSymbol in symbol.ConstituentSymbols)
{
inspectRecursive(sb, childSymbol, depth + 1);
}
}
private void operator operatorButtonClicked(Symbol op)
{
if (ERROR_MESSAGE.Equals(_equationText))
{
changeEquationText("0" + op.ToString());
return;
}
var eq = new Equation(_equationText);
if (eq.HasFinalOperator())
{
changeEquationText(eq.ReplaceFinalOperator(op));
} else
{
changeEquationText(_equationText
+ op.ToString());
}
}