public Expression(string textOfCurrentLine)
{
this.input = textOfCurrentLine;
Tokens = new Tokens(input);
ReturnMessage = new ShuntingYard().ConvertToPostFixed(Tokens.AsList());
if (ReturnMessage.Success == false) {
failureMessage = ReturnMessage.Message;
} else {
PostFixedTokens = (List<Token>)ReturnMessage.ReturnValue;
//Put postfixed Tokens into the tree
foreach (Token t in PostFixedTokens) {
ReturnMessage = ParseTree.AddToken(t);
if (ReturnMessage.Success == false) {
failureMessage = ReturnMessage.Message;
}
}
}
//Set the outputString
if (ReturnMessage.Success) {
NumericalEvaluation = ParseTree.SetRoot().Evaluate();
SystemLog.Add(NumericalEvaluation, LogObjectType.value);
OutputString = NumericalEvaluation.ToString();
} else {
NumericalEvaluation = null;
SystemLog.Add(failureMessage, LogObjectType.failureMessage);
OutputString = failureMessage;
}
}
public void SetCurrentLine(string line)
{
lineNumber++;
currentLine = line;
Value = null;
if(currentLine.Count() > 0){
localExpression = new Expression(currentLine);
if (localExpression.NumericalEvaluation != null) {
Value = localExpression.NumericalEvaluation;
OutputString = localExpression.OutputString;
} else {
OutputString = "\""+line+"\" " + localExpression.OutputString;
}
}
}
static NumericalValue times(NumericalValue p1, NumericalValue p2)
{
return new NumericalValue(p1.AsDecimal() * p2.AsDecimal());
}
static NumericalValue plus(NumericalValue p1, NumericalValue p2)
{
return new NumericalValue(p1.AsDecimal() + p2.AsDecimal());
}
static NumericalValue power(NumericalValue p1, NumericalValue p2)
{
return new NumericalValue((decimal)Math.Pow((double)p1.AsDecimal(), (double)p2.AsDecimal()));
//TODO: Handle all overflow exceptions
//TODO: Catch overflow exceptions
//Get a mathematics library that can do computations without overflow or divide by zero
//Report to UI or save the value without evaluating
}
static NumericalValue dividedBy(NumericalValue p1, NumericalValue p2)
{
return new NumericalValue(p1.AsDecimal() / p2.AsDecimal());
}
public override void SetValue(LinkedList<Node> childrenToAdd)
{
if (childrenToAdd.Count != 2)
throw new Exception("A two parameter operator must have two parameters");
value = InfixOperators.GetOpInfo[this.op].Compute
(childrenToAdd.Last().GetValue(), childrenToAdd.First().GetValue());
Children = childrenToAdd;
}
public NumberNode(NumericalValue val)
{
this.value = val;
}
public NumberNode(double val)
{
this.value = new NumericalValue(val);
}
public NumberNode(decimal val)
{
this.value = new NumericalValue(val);
}