private string parseUserDefinedFunction(ASTNode rootNode, string functionId)
{
FunctionDefinition function = null;
foreach (var funcDef in FunctionDefinitions.Where(funcDef => funcDef.getId() == functionId))
{
function = funcDef;
}
if (function?.getNumArguments() != rootNode.getNumChildren())
{
return(string.Empty); //error
}
var tmpDictionary = new Dictionary <string, string>();
for (long i = 0; i < function.getNumArguments(); i++)
{
var argument = function.getArgument(i).getName();
var replacement = Eval(rootNode.getChild(i));
tmpDictionary.Add(argument, replacement);
_functionDefDictionary[argument] = replacement;
}
foreach (var entry in tmpDictionary)
{
_functionDefDictionary[entry.Key] = entry.Value;
}
var res = Eval(function.getBody());
return(res);
}
/// <summary>
/// Parses a user defined function by looking it up in the pre-imported user defined
/// functions.
/// </summary>
private string parseFunction(ASTNode rootNode)
{
if (FunctionDefinitions == null)
{
return(String.Empty);
}
foreach (var func in FunctionDefinitions.Where(func => rootNode.getName() == func.getId()))
{
return(parseUserDefinedFunction(rootNode, func.getId()));
}
return(string.Empty);
}