protected object EvaluateFunction(Environment env, UserFunction function)
{
if (function == null)
{
throw new ArgumentNullException(nameof(function), "null function");
}
ParameterNode parameters = function.Parameters;
Tuple arguments = Evaluate(env) as Tuple;
if (arguments == null)
{
throw new LepException("bad expression argument", this);
}
if (arguments.Count != parameters.Count)
{
throw new LepException("bad number of argument", this);
}
Environment inner = function.CreateEnvironment();
for (int i = 0; i < arguments.Count; i++)
{
parameters.Evaluate(inner, i, arguments[i]);
}
try { return(function.Body.Evaluate(inner)); }
catch (JumpSignal signal)
{
if (signal.SignalType == JumpSignal.ReturnSignal)
{
return(signal.ReturnValue);
}
else
{
throw;
}
}
}
protected object EvaluateFunction(Environment env, UserFunction function)
{
if (function == null)
{
throw new ArgumentNullException(nameof(function), "null function");
}
ParameterNode parameters = function.Parameters;
if (Count != parameters.Count)
{
throw new LepException("bad number of arguments", this);
}
Environment inner = function.CreateEnvironment();
int count = 0;
foreach (IAstNode node in this)
{
parameters.Evaluate(inner, count++, node.Evaluate(env));
}
try { return(function.Body.Evaluate(inner)); }
catch (JumpSignal signal)
{
if (signal.SignalType == JumpSignal.ReturnSignal)
{
return(signal.ReturnValue);
}
else
{
throw;
}
}
}
