/// <summary>
/// the list of parameters must correspond the the required set of Arguments
/// </summary>
/// <param name="parameters"></param>
/// <returns></returns>
public override object Eval(object[] parameters, ParseTreeEvaluator tree)
{
// create a new scope for the arguments
var pars = Arguments.Clone();
// now push a copy of the function arguments on the stack
tree.Context.PushScope(pars);
// assign the parameters to the current function scope variables
var i = 0;
var keys = pars.Keys.ToArray();
foreach (var key in keys)
{
pars[key] = parameters[i++];
}
// execute the function here
var result = Node.Eval(tree, null);
// clean up the stack
tree.Context.PopScope();
return(result);
}
public override object Eval(object[] parameters, ParseTreeEvaluator tree)
{
tree.Context.PushScope(null);
var result = FunctionDelegate(parameters);
tree.Context.PopScope();
return(result);
}
/// <summary>
/// required to override this function from base otherwise the parsetree will consist of incorrect types of nodes
/// </summary>
/// <param name="token"></param>
/// <param name="text"></param>
/// <returns></returns>
public override ParseNode CreateNode(Token token, string text)
{
var node = new ParseTreeEvaluator();
node.Token = token;
node.text = text;
node.Parent = this;
return(node);
}
public Expression(string exp)
{
expression = exp;
var scanner = new Scanner();
var parser = new Parser(scanner);
tree = new ParseTreeEvaluator(Context.Default);
tree = parser.Parse(expression, tree) as ParseTreeEvaluator;
}
public abstract object Eval(object[] parameters, ParseTreeEvaluator tree);
public override object Eval(object[] parameters, ParseTreeEvaluator tree)
{
// CommandPrompt console = tree.Context.Console;
// if (console != null) console.Text = "";
return(null);
}