/// <summary>
/// recursively evaluate the value of an ExpNode
/// </summary>
/// <param name="variables">a dictionary of variable names and values</param>
/// <returns>the double value of the evaluated ExpNode</returns>
internal double Evaluate(Dictionary <string, double> variables)
{
double value = 0.0d;
var tokenHandler = TokenHandlerFactory.GenerateTokenHandler(Token);
tokenHandler.HandleTreeEvaluation(this, variables, ref value);
return(value);
}
/// <summary>
/// initialize variables, convert infix expression
/// to postfix, then generate expression tree
/// </summary>
/// <param name="expression">a string containing an infix expression to convert to an expression tree</param>
public ExpTree(string expression)
{
Variables = new Dictionary <string, double>();
_postfixTokens = new List <string>();
_tokenHandlers = TokenHandlerFactory.GenerateTokenHandlerList();
_encounteredError = false;
If2Pf(expression);
GenerateTree();
}