public double EvaluateArithExpression(string[] tokens, int start)
{
tokens = context.ReplaceToValues(tokens, start);
string line = Interpreter.GetString(tokens);
//Debug.Log("Infix: [" + line + "]");
InfixPrefix IP = new InfixPrefix(ArithOperators);
string ipOut = IP.ConvertInfixToPrefix(line);
tokens = InfixPrefix.GetTokens(ipOut);
//Debug.Log("Prefix: " + ipOut);
Stack<double> operands = new Stack<double>();
for (int i = tokens.Length - 1; i > -1; i--)
{
string token = tokens[i];
if (!ArithOperators.ContainsKey(token))
{
double op = 0;
if (double.TryParse(token, out op))
operands.Push(op);
else
context.ThrowError("The operand is not a number. ( " + token + " )");
}
else
{
//its an operator
double op1 = operands.Pop();
double op2 = operands.Pop();
operands.Push(ComputeArith(token, op1, op2));
}
}
return operands.Pop();
}
/// <summary>
/// Evaluate a logical expression
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public bool EvaluateLogic(string[] tokens, int start)
{
tokens = context.ReplaceToValues(tokens, start);
string line = Interpreter.GetString(tokens);
//Debug.Log("Infix: " + line);
InfixPrefix IP = new InfixPrefix(LogicOperators);
string ipOut = IP.ConvertInfixToPrefix(line);
tokens = InfixPrefix.GetTokens(ipOut);
//Debug.Log("Prefix: " + ipOut);
Stack<string> operands = new Stack<string>();
for (int i = tokens.Length - 1; i > -1; i--)
{
string token = tokens[i];
if (!LogicOperators.ContainsKey(token))
{
operands.Push(token);
}
else
{
//its an operator
string op1 = operands.Pop();
string op2 = operands.Pop();
//Debug.Log("OP1 " + op1 + " OP2 " + op2 + " OPR" + token);
operands.Push(ProcessCondition(token, op1, op2));
}
//Debug.Log("Operands stack [" + Interpreter.GetString(operands.ToArray()) + "]");
}
string fin = operands.Pop();
//Debug.Log(fin);
return bool.Parse(fin);
}