public Nothing VisitClassStmt(Stmt.Class stmt)
{
Declare(stmt.Name);
Define(stmt.Name);
ClassType enclosingClass = currentClass;
currentClass = ClassType.Class;
if (stmt.Superclass != null)
{
currentClass = ClassType.Subclass;
Resolve(stmt.Superclass);
BeginScope();
scopes.Peek().Add("super", true);
}
BeginScope();
scopes.Peek().Add("this", true);
foreach (var method in stmt.Methods)
{
FunctionType declaration = FunctionType.Method;
if (method.Name.Lexeme.Equals("init"))
{
declaration = FunctionType.Initializer;
}
ResolveFunction(method, declaration);
}
EndScope();
if (stmt.Superclass != null)
{
EndScope();
}
currentClass = enclosingClass;
return(Nothing.AtAll);
}
public Nothing VisitClassStmt(Stmt.Class stmt)
{
environment.Define(stmt.Name.Lexeme, null);
object superclass = null;
if (stmt.Superclass != null)
{
superclass = Evaluate(stmt.Superclass);
if (!(superclass is LoxClass))
{
throw new RuntimeError(stmt.Name, "Superclass must be a class.");
}
environment = new Environment(environment);
environment.Define("super", superclass);
}
Dictionary <string, LoxFunction> methods = new Dictionary <string, LoxFunction>();
foreach (var method in stmt.Methods)
{
LoxFunction function = new LoxFunction(method, environment, method.Name.Lexeme.Equals("init"));
methods.Add(method.Name.Lexeme, function);
}
LoxClass klass = new LoxClass(stmt.Name.Lexeme, (LoxClass)superclass, methods);
if (superclass != null)
{
environment = environment.Enclosing;
}
environment.Assign(stmt.Name, klass);
return(Nothing.AtAll);
}