private static EnviromentNode EvalSentense(ParseNode node, Enviroment enviroment)
{
EnviromentNode envNode = new EnviromentNode(enviroment);
if (node.Token.Type == TokenType.LET)
{
EvalVariableSentense(node, enviroment, envNode);
if (!string.IsNullOrEmpty(envNode.Symbol))
enviroment.AddEnviromentNode(envNode);
}
else if (node.Token.Type == TokenType.SET)
{
EvalVariableSentense(node, enviroment, envNode);
if (!string.IsNullOrEmpty(envNode.Symbol))
enviroment.UpdateEnviromentNode(envNode);
}
else if (node.Token.Type == TokenType.FUNCDEF)
{
EvalFunctionDefineSentense(node, enviroment, envNode);
if (!string.IsNullOrEmpty(envNode.Symbol))
enviroment.AddEnviromentNode(envNode);
}
else if (node.Token.Type == TokenType.FUNCTION)
{
// if a direct call occures in eval sentense, it must be an IO, or return
envNode = EvalDirectFunctionCall(node, enviroment, envNode.Enviroment);
if (!string.IsNullOrEmpty(envNode.Symbol))
enviroment.AddEnviromentNode(envNode);
}
return envNode;
}
private static void BindParameter(EnviromentNode[] parameters, Enviroment newEnviro, int index, string symbol)
{
EnviromentNode applyTo = parameters.Length < index ? null : parameters[index];
EnviromentNode newNode = null;
if (applyTo == null)
{
newNode = new EnviromentNode(newEnviro);
newNode.Symbol = symbol;
}
else
{
EnviromentNode applyEnvNode = applyTo;
newNode = new EnviromentNode(newEnviro, applyEnvNode);
newNode.Symbol = symbol;
}
newEnviro.AddEnviromentNode(newNode);
}