public override bool Equals(object obj)
{
EvalValue b = obj as EvalValue;
if (stringValue == null)
{
return(D == b.D);
}
else
{
return(S == b.S);
}
}
private decimal evalExternalFunctionCall(String funcName, String expr)
{
Tokenizer paramTokenizer = new Tokenizer(expr, ",", true);
System.Collections.ArrayList functionParms = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
while (paramTokenizer.HasMoreTokens())
{
String arg = getNextToken(paramTokenizer).Trim();
if ((arg.StartsWith("\"") || arg.StartsWith("'")) && (arg.EndsWith("\"") || arg.EndsWith("'")))
{
// it is a string
functionParms.Add(arg.Substring(1, (arg.Length - 1) - (1)));
}
else
{
// evaluate the parameter
EvalValue eValue = eval(arg);
// The corresponding type of parameter is passed
if (eValue.S == null)
{
functionParms.Add(eValue.D);
}
else
{
functionParms.Add(eValue.S);
}
}
if (paramTokenizer.HasMoreTokens())
{
// Consume the ','
paramTokenizer.NextToken();
}
}
functionParms.Add((decimal)0);
System.Object[] callParms = new System.Object[functionParms.Count];
functionParms.CopyTo(callParms);
bool pAdded = false;
try
{
funcName = funcName.ToLower();
DynamicExecute(funcName, callParms);
}
catch (System.Exception e)
{
bool retrySuccessful = false;
if (!pAdded && e.ToString().IndexOf("ClassNotFoundException") != -1)
{
try
{
DynamicExecute("p" + funcName, callParms);
retrySuccessful = true;
}
catch (System.Exception)
{
}
}
if (!retrySuccessful)
{
return(throwException(EXTERNAL_FUNCTION_ERROR, e.Message));
}
}
return(Convert.ToDecimal(callParms[callParms.Length - 1], System.Globalization.CultureInfo.InvariantCulture));
}
private decimal evalFuncCall(String funcName, String expr)
{
EvalValue result = 0;
if (funcName.ToUpper().Equals("rnd".ToUpper()))
{
// random function
result = (decimal)NumberUtil.Random();
}
else
// single variable function
if (funcName.ToUpper().Equals("abs".ToUpper()))
{
result = System.Math.Abs(eval(expr).D);
}
else if (funcName.ToUpper().Equals("int".ToUpper()))
{
result = System.Math.Floor(eval(expr).D);
}
else if (funcName.ToUpper().Equals("frac".ToUpper()))
{
EvalValue value = eval(expr);
EvalValue int_part = System.Math.Floor(value.D);
result = value - int_part;
}
else if (funcName.ToUpper().Equals("sin".ToUpper()))
{
result = (decimal)System.Math.Sin(Convert.ToDouble((decimal)eval(expr)));
}
else if (funcName.ToUpper().Equals("asin".ToUpper()))
{
result = (decimal)System.Math.Asin(Convert.ToDouble((decimal)eval(expr)));
}
else if (funcName.ToUpper().Equals("cos".ToUpper()))
{
result = (decimal)System.Math.Cos(Convert.ToDouble((decimal)eval(expr)));
}
else if (funcName.ToUpper().Equals("acos".ToUpper()))
{
decimal x = eval(expr).D;
if (x > 1 || x < -1)
{
throwException(EVALUATION_ERROR, "Invalid range");
}
result = (decimal)System.Math.Acos(Convert.ToDouble(x));
}
else if (funcName.ToUpper().Equals("tan".ToUpper()))
{
result = (decimal)System.Math.Tan(Convert.ToDouble((decimal)eval(expr)));
}
else if (funcName.ToUpper().Equals("atan".ToUpper()))
{
result = (decimal)System.Math.Atan(Convert.ToDouble((decimal)eval(expr)));
}
else if (funcName.ToUpper().Equals("floor".ToUpper()))
{
result = (decimal)System.Math.Floor(Convert.ToDouble((decimal)eval(expr)));
}
else if (funcName.ToUpper().Equals("round".ToUpper()))
{
result = System.Math.Round(eval(expr));
}
else if (funcName.ToUpper().Equals("ln".ToUpper()) || funcName.ToUpper().Equals("log".ToUpper()))
{
decimal val = eval(expr);
if (val <= 0)
{
return(throwException(EVALUATION_ERROR, "Illegal argument (" + val + ") to function log(" + expr + ")"));
}
result = (decimal)System.Math.Log(Convert.ToDouble(val));
}
else if (funcName.ToUpper().Equals("exp".ToUpper()))
{
result = (decimal)System.Math.Exp(Convert.ToDouble((decimal)eval(expr)));
}
else if (funcName.ToUpper().Equals("sqrt".ToUpper()))
{
result = (decimal)System.Math.Sqrt(Convert.ToDouble((decimal)eval(expr)));
}
else
// internal functions of 2 variables
if (funcName.ToUpper().Equals("pow".ToUpper()) || funcName.ToUpper().Equals("max".ToUpper()) || funcName.ToUpper().Equals("min".ToUpper()))
{
Tokenizer paramTokenizer = new Tokenizer(expr, ",", true);
String sarg1, sarg2;
try
{
sarg1 = getNextToken(paramTokenizer);
paramTokenizer.NextToken();
sarg2 = getNextToken(paramTokenizer);
}
catch (System.ArgumentOutOfRangeException)
{
return(throwException(EVALUATION_ERROR, "The function " + funcName + " needs 2 arguments"));
}
decimal arg1 = eval(sarg1);
decimal arg2 = eval(sarg2);
if (funcName.ToUpper().Equals("pow".ToUpper()))
{
result = (decimal)System.Math.Pow(Convert.ToDouble(arg1), Convert.ToDouble(arg2));
}
else if (funcName.ToUpper().Equals("max".ToUpper()))
{
result = System.Math.Max(arg1, arg2);
}
else if (funcName.ToUpper().Equals("min".ToUpper()))
{
result = System.Math.Min(arg1, arg2);
}
}
else
if (funcName.ToUpper().Equals("iif".ToUpper()))
{
// iif
Tokenizer paramTokenizer = new Tokenizer(expr, ",", true);
String sarg1, sarg2, sarg3;
try
{
sarg1 = getNextToken(paramTokenizer);
paramTokenizer.NextToken();
sarg2 = getNextToken(paramTokenizer);
paramTokenizer.NextToken();
sarg3 = getNextToken(paramTokenizer);
}
catch (System.ArgumentOutOfRangeException)
{
return(throwException(EVALUATION_ERROR, "The function " + funcName + " needs 3 arguments"));
}
iifContext = true;
bool iif_result = (eval(sarg1) != 0);
iifContext = false;
if (ErrCode != 0)
{
return(result);
}
if (iif_result)
{
result = eval(sarg2);
}
else
{
result = eval(sarg3);
}
}
else
{
result = evalExternalFunctionCall(funcName, expr);
}
return(result);
}
private EvalValue evaluate(String fullExpression, Tokenizer tokenizer, bool stopOnLowPrecedence)
{
EvalValue retVal = eval(tokenizer);
EvalValue termino = 0;
while (tokenizer.HasMoreTokens())
{
if (stopOnLowPrecedence)
{
string nextOp;
if (tokenizer.Peek(out nextOp) && nextOp.Length >= 1 && (nextOp[0] == '+' || nextOp[0] == '-'))
{
break;
}
}
string soperador = tokenizer.NextToken();
if (String.IsNullOrEmpty(soperador.Trim()))
{
continue;
}
char operador = soperador[0];
switch (operador)
{
case '+':
termino = evaluate(fullExpression, tokenizer, true);
retVal = retVal + termino;
break;
case '-':
termino = evaluate(fullExpression, tokenizer, true);
retVal = retVal - termino;
break;
case '*':
termino = eval(tokenizer);
retVal = retVal * termino;
break;
case '/':
termino = eval(tokenizer);
if (termino == 0 && errCode == 0)
{
throwException(EVALUATION_ERROR, "Division by zero");
}
if (errCode == 0)
{
retVal = retVal / termino;
}
break;
case '>': return(retVal > evaluate(fullExpression, tokenizer) ? 1 : 0);
case '<': return(retVal < evaluate(fullExpression, tokenizer) ? 1 : 0);
case '=': return(retVal == evaluate(fullExpression, tokenizer) ? 1 : 0);
case GE: return(retVal >= evaluate(fullExpression, tokenizer) ? 1 : 0);
case LE: return(retVal <= evaluate(fullExpression, tokenizer) ? 1 : 0);
case AND: return((retVal != 0) && (evaluate(fullExpression, tokenizer) != 0) ? 1 : 0);
case OR: return((retVal != 0) || (evaluate(fullExpression, tokenizer) != 0) ? 1 : 0);
case NE: return(retVal != evaluate(fullExpression, tokenizer) ? 1 : 0);
default:
throwException(EVALUATION_ERROR, "Unknown operator '" + soperador + "' found in expression '" + fullExpression + "'");
break;
}
}
return(retVal);
}
