public LoxFunction FindMethod(string name)
{
if (_methods.TryGetValue(name, out var method))
{
return(method);
}
if (_superclass != null)
{
return(_superclass.FindMethod(name));
}
return(null);
}
private object EvaluateSuperExpression(SuperExpression expr)
{
int distance = _locals[expr];
LoxClass superclass = (LoxClass)_environment.GetAt(distance, new Token(TokenType.Super, "super", null, 0));
LoxInstance obj = (LoxInstance)_environment.GetAt(distance - 1, new Token(TokenType.This, "this", null, 0));
var method = superclass.FindMethod(expr.Method.Lexeme);
if (method == null)
{
throw new RuntimeError(expr.Method, $"Undefine property {expr.Method.Lexeme}");
}
return(method.Bind(obj));
}
public LoxFunction FindMethod(string name)
{
if (Methods.ContainsKey(name))
{
return(Methods[name]);
}
if (Superclass != null)
{
return(Superclass.FindMethod(name));
}
return(null);
}
public object Get(Token name)
{
if (fields.ContainsKey(name.Lexeme))
{
return(fields[name.Lexeme]);
}
LoxFunction method = klass.FindMethod(name.Lexeme);
if (method != null)
{
return(method.Bind(this));
}
throw new RuntimeError(name, "Undefined property '" + name.Lexeme + "'.");
}
public object VisitSuperExpr(Super expr)
{
int distance = locals[expr];
LoxClass superclass = (LoxClass)environment.GetAt(distance, "super");
LoxInstance obj = (LoxInstance)environment.GetAt(distance - 1, "this");
LoxFunction method = superclass.FindMethod(expr.Method.Lexeme);
if (method == null)
{
throw new RuntimeError(expr.Method, "Undefined property '" + expr.Method.Lexeme + "'.");
}
return(method.Bind(obj));
}
public object Get(Token name)
{
if (_fields.ContainsKey(name.Lexeme))
{
return(_fields[name.Lexeme]);
}
var method = _class.FindMethod(name.Lexeme);
if (method != null)
{
return(method.Bind(this));
}
throw new RuntimeError(name, $"Undefined property {name.Lexeme}.");
}
public object Get(Token name)
{
if (_fields.TryGetValue(name.Lexeme, out var value))
{
return(value);
}
var method = _class.FindMethod(name.Lexeme);
if (method != null)
{
return(method.Bind(this));
}
throw new RuntimeError(name, $"Undefined property '{name.Lexeme}'.");
}
object Expr.IVisitor <object> .Visit(Expr.Super _super)
{
int distance = _locals[_super];
LoxClass superclass = (LoxClass)_environment.GetAt(distance, "super");
// "this" is always one level nearer than "super"'s environment.
LoxInstance _object = (LoxInstance)_environment.GetAt(distance - 1, "this");
LoxFunction method = superclass.FindMethod(_super.method.lexeme);
if (method == null)
{
throw new RuntimeError(_super.method, "Undefined property '" + _super.method.lexeme + "'.");
}
return(method.Bind(_object));
}