private void SetDefaultProperty(GXProperties properties, String prop, String value)
{
if (!properties.ContainsKey(prop))
{
properties.Set(prop, value);
}
}
private EvalValue eval(Tokenizer tokenizer)
{
String token = getNextToken(tokenizer);
if (token.ToUpper().Equals("!".ToUpper()))
{
// Expresion '!expr'
return(eval(tokenizer) == 0 ? 1 : 0);
}
if (token.ToUpper().Equals("-".ToUpper()))
{
// Expresion '-expr'
return(-eval(tokenizer));
}
if (token.ToUpper().Equals("+".ToUpper()))
{
// Expresion '+expr'
return(eval(tokenizer));
}
// Finished processing
// So check if it is an expression with parentheses, a number, or a function
if (token.StartsWith("(") && token.EndsWith(")"))
{
// Si es una expresion entre parentesis
return(eval(token.Substring(1, (token.Length - 1) - (1)).Trim()));
}
if (System.Char.IsDigit(token[0]) || token[0] == '.')
{
// If it is a constant (number)
try
{
return(decimal.Parse(token, System.Globalization.CultureInfo.InvariantCulture));
}
catch (FormatException e)
{
throwException(EVALUATION_ERROR, e.Message);
return(0);
}
}
if (token.StartsWith("'"))
{
// If it is a constant (char)
string s = "";
string tk = tokenizer.NextToken();
while (tk != "'")
{
s += tk;
tk = tokenizer.NextToken();
}
return(new EvalValue(s));
}
if (token.ToUpper().Equals("PI".ToUpper()))
{
return((decimal)System.Math.PI);
}
if (parms.ContainsKey(token))
{
// If it is a variable, return its value
try
{
return(eval(parms[token]));
}
catch (FormatException e)
{
throwException(EVALUATION_ERROR, "Variable " + token + " cannot be evaluated: " + e.Message);
}
}
//If it is none of this, it must be a function
int indexLeftParen = token.IndexOf((System.Char) '(');
int indexRightParen = token.LastIndexOf((System.Char) ')');
if (indexLeftParen == -1 || indexRightParen == -1 || indexRightParen <= indexLeftParen)
{
// If it is not a function, it is a variable without reference
return(throwException(EVALUATION_ERROR, "Invalid variable reference: " + token));
}
String funcName = token.Substring(0, (indexLeftParen) - (0));
return(evalFuncCall(funcName, token.Substring(indexLeftParen + 1, (indexRightParen) - (indexLeftParen + 1))));
}