public Scope Extend(Pattern pattern)
{
Scope scope = this;
if (pattern is SinglePattern)
{
scope = new ConsScope((pattern as SinglePattern).name, scope);
}
else if (pattern is ListPattern)
{
scope = scope.Extend((pattern as ListPattern).list.parameters);
}
else if (pattern is HeadConsPattern)
{
scope = scope.Extend((pattern as HeadConsPattern).list.parameters);
scope = new ConsScope((pattern as HeadConsPattern).single.name, scope);
}
else if (pattern is TailConsPattern)
{
scope = new ConsScope((pattern as TailConsPattern).single.name, scope);
scope = scope.Extend((pattern as TailConsPattern).list.parameters);
}
else
{
throw new Error("Pattern");
}
return(scope);
}
public override Scope ToScope()
{
Scope scope = next.ToScope();
foreach (var kvp in builtin)
{
scope = new ConsScope(kvp.Key, scope);
}
return(scope);
}