public object VisitFunctionStmt(Function stmt)
{
var function = new LoxFunction(stmt, _environment, false);
_environment.Define(stmt.Name.Lexeme, function);
return(null);
}
public object VisitClassStmt(Class stmt)
{
object superclass = null;
if (stmt.Superclass != null)
{
superclass = Evaluate(stmt.Superclass);
if (!(superclass is LoxClass))
{
throw new RuntimeError(stmt.Superclass.Name, "Superclass must be a class.");
}
}
_environment.Define(stmt.Name.Lexeme, null);
if (stmt.Superclass != null)
{
_environment = new Environment(_environment);
_environment.Define("super", superclass);
}
var methods = new Dictionary <string, LoxFunction>();
foreach (var method in stmt.Methods)
{
var isInitializer = method.Name.Lexeme == "init";
var function = new LoxFunction(method, _environment, isInitializer);
methods.Add(method.Name.Lexeme, function);
}
var klass = new LoxClass(stmt.Name.Lexeme, (LoxClass)superclass, methods);
if (superclass != null)
{
_environment = _environment.Enclosing;
}
_environment.Assign(stmt.Name, klass);
return(null);
}