public IEnumerable <FuncDef> GetFunc(string name, int arity)
{
if (name == null)
{
var ctx = this;
while (ctx != null)
{
foreach (var v in ctx.values)
{
var fd = v as FuncDef;
if (fd != null)
{
yield return(fd);
}
}
ctx = ctx.parent;
}
}
else
{
int i = IndexOf(name);
if (i >= 0)
{
var v = this[i];
if (v is FuncDef)
{
var def = (FuncDef)v;
if (def.minArity <= arity && arity <= def.maxArity)
{
yield return(def);
}
}
else if (v is LazyAsync)
{
AsyncFn f =
(ae, args) =>
{
return(OPs._call_func(ae, i, args));
};
yield return(new FuncDef(f, 0, int.MaxValue, name));
}
}
}
for (int i = externalFuncs.Count - 1; i >= 0; i--)
{
foreach (var fd in externalFuncs[i](name, arity))
{
yield return(fd);
}
}
}
