private static Expression SimplifyFunction(Function node)
{
bool @const = true;
for (int i = 0; i < node.Arguments.Count; i++)
{
node.Arguments[i] = Simplify(node.Arguments[i]);
if (node.Arguments[i].Type != ExpressionType.Float)
{
@const = false;
}
}
if (!@const)
{
return(node);
}
double value;
FunctionEntry entry = node.Entry;
List <Operand> operands = new List <Operand>();
for (int i = 0; i < node.Arguments.Count; i++)
{
operands.Add(new Operand(((Float)node.Arguments[i]).Value));
}
value = entry.Exec(operands).value;
return(new Float {
Value = value
});
}
public StackFunction(FunctionEntry func) : base(StackElementType.Function)
{
this.func = func;
}
static public string Print(RPNExpression exp, string [] variableNames)
{
List <StackElement> rpn = exp.rpn;
Stack <PrintElement> operands = new Stack <PrintElement>();
for (int i = 0; i < rpn.Count; i++)
{
switch (rpn[i].Type)
{
case StackElementType.Negation:
{
PrintElement operand = operands.Pop();
if (operand.Type < PrintElement.ElementType.Negation)
{
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Negation,
String = "-(" + operand.String + ")"
});
}
else
{
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Negation,
String = "-" + operand.String
});
}
break;
}
case StackElementType.Addition:
{
PrintElement right = operands.Pop();
PrintElement left = operands.Pop();
if (left.Type < PrintElement.ElementType.Addition)
{
left.String = "(" + left.String + ")";
}
if (right.Type < PrintElement.ElementType.Addition)
{
right.String = "(" + right.String + ")";
}
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Addition,
String = left.String + "+" + right.String
});
break;
}
case StackElementType.Subtraction:
{
PrintElement right = operands.Pop();
PrintElement left = operands.Pop();
if (left.Type < PrintElement.ElementType.Addition)
{
left.String = "(" + left.String + ")";
}
if (right.Type <= PrintElement.ElementType.Addition)
{
right.String = "(" + right.String + ")";
}
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Addition,
String = left.String + "-" + right.String
});
break;
}
case StackElementType.Multiplication:
{
PrintElement right = operands.Pop();
PrintElement left = operands.Pop();
if (left.Type < PrintElement.ElementType.Multiplication)
{
left.String = "(" + left.String + ")";
}
if (right.Type < PrintElement.ElementType.Multiplication)
{
right.String = "(" + right.String + ")";
}
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Multiplication,
String = left.String + "*" + right.String
});
break;
}
case StackElementType.Division:
{
PrintElement right = operands.Pop();
PrintElement left = operands.Pop();
if (left.Type < PrintElement.ElementType.Multiplication)
{
left.String = "(" + left.String + ")";
}
if (right.Type < PrintElement.ElementType.Multiplication)
{
right.String = "(" + right.String + ")";
}
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Multiplication,
String = left.String + "/" + right.String
});
break;
}
case StackElementType.Power:
{
PrintElement right = operands.Pop();
PrintElement left = operands.Pop();
if (left.Type <= PrintElement.ElementType.Power)
{
left.String = "(" + left.String + ")";
}
if (right.Type < PrintElement.ElementType.Power)
{
right.String = "(" + right.String + ")";
}
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Multiplication,
String = left.String + "^" + right.String
});
break;
}
case StackElementType.Variable:
{
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Identifier,
String = variableNames[((StackVariable)rpn[i]).index]
});
break;
}
case StackElementType.Function:
{
StackFunction func = (StackFunction)rpn[i];
FunctionEntry entry = func.GetFunctionEntry();
string @string = "";
for (int j = 0; j < entry.ArgNumber; j++)
{
PrintElement operand = operands.Pop();
if (j != 0)
{
@string = ", " + @string;
}
@string = operand.String + @string;
}
operands.Push(new PrintElement
{
Type = PrintElement.ElementType.Function,
String = entry.FuncName + "(" + @string + ")"
});
break;
}
case StackElementType.Operand:
{
PrintElement element = new PrintElement();
element.Type = PrintElement.ElementType.Float;
element.String = Convert.ToString(((Operand)rpn[i]).value);
operands.Push(element);
break;
}
}
}
return(operands.Pop().String);
}
public Function(FunctionEntry entry, List <Expression> arguments)
{
Type = ExpressionType.Function;
Entry = entry;
Arguments = arguments;
}