public object VisitFunctionStmt(FunctionStmt stmt)
{
var func = new LoxFunction(stmt, _scope, false);
_scope.Define(stmt.Name.Lexeme, func);
return(null);
}
public object Call(Interpreter interpreter, List <object> arguments)
{
LoxInstance instance = new LoxInstance(this);
LoxFunction initializer = FindMethod("init");
initializer?.Bind(instance).Call(interpreter, arguments);
return(instance);
}
public object VisitFunctionStmt(Function stmt)
{
LoxFunction function = new LoxFunction(stmt, environment, false);
environment.Define(stmt.Name.Lexeme, function);
return(null);
}
public int Arity()
{
LoxFunction initializer = FindMethod("init");
return(initializer?.Arity() ?? 0);
;
}
public object VisitFunctionStmt(Stmt.Function stmt)
{
LoxFunction function = new LoxFunction(stmt, _environment, false);
if (stmt.Name != null)
{
_environment.Define(stmt.Name.Lexeme, function);
}
return(null);
}
public int Arity()
{
LoxFunction initializer = FindMethod("init");
if (initializer == null)
{
return(0);
}
return(initializer.Arity());
}
public Object Call(Interpreter interpreter, List <Object> arguments)
{
LoxInstance instance = new LoxInstance(this);
LoxFunction initializer = FindMethod("init");
if (initializer != null)
{
initializer.Bind(instance).Call(interpreter, arguments);
}
return(instance);
}
public object VisitSuperExpr(Expr.Super expr)
{
int? distance = _locals[expr];
LoxClass superclass = (LoxClass)_environment.GetAt((int)distance, "super");
LoxInstance @object = (LoxInstance)_environment.GetAt((int)distance - 1, "this");
LoxFunction method = superclass.FindMethod(expr.Method.Lexeme);
if (method == null)
{
throw new RuntimeError(expr.Method, $"Undefined method '{expr.Method.Lexeme}'.");
}
return(method.Bind(@object));
}
public object Get(Token name)
{
if (fields.TryGetValue(name.Lexeme, out object value))
{
return(value);
}
LoxFunction method = @class.FindMethod(name.Lexeme);
if (method != null)
{
return(method.Bind(this));
}
throw new RuntimeException(name, $"Undefined property '{name.Lexeme}'.");
}
public object Get(Token name)
{
if (_fields.ContainsKey(name.Lexeme))
{
return(_fields[name.Lexeme]);
}
LoxFunction method = _class.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");
// "this" is always one level nearer than "super"'s environment.
LoxInstance @object = (LoxInstance)environment.GetAt(distance - 1, "this");
LoxFunction method = superclass.FindMethod(expr.Method.Lexeme);
if (method == null)
{
throw new RuntimeException(expr.Method, $"Undefined property '{expr.Method.Lexeme}'.");
}
return(method.Bind(@object));
}
public Object Visit_SuperExpr(SuperExpr expr)
{
int distance = _locals[expr];
LoxClass superclass = (LoxClass)_environment.GetAt(distance, "super");
// "this" is always one level nearer than "super"'s environment.
LoxInstance obj = (LoxInstance)_environment.GetAt(distance - 1, "this");
string name = (string)expr.method.value;
LoxFunction method = superclass.FindMethod(name);
if (method == null)
{
throw new RuntimeException(expr.method.line, expr.method.column, "Undefined property '" + name + "'.");
}
return(method.Bind(obj));
}
public Object Get(Token nameToken)
{
var name = (string)nameToken.value;
var hasKey = _fields.TryGetValue(name, out Object value);
if (hasKey)
{
return(value);
}
LoxFunction method = _klass.FindMethod(name);
if (method != null)
{
return(method.Bind(this));
}
throw new RuntimeException(nameToken.line, nameToken.column, "Undefined property '" + name + "'.");
}
public Void Visit_ClassStmt(ClassStmt stmt)
{
Object superclass = null;
if (stmt.superclass != null)
{
superclass = Evaluate(stmt.superclass);
if (!(superclass is LoxClass))
{
throw new RuntimeException(stmt.superclass.name.line, stmt.superclass.name.column, "Superclass must be a class.");
}
}
var name = (string)stmt.name.value;
_environment.Define(name, null);
if (stmt.superclass != null)
{
_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, name == "init");
methods.Add((string)method.name.value, function);
}
LoxClass klass = new LoxClass((string)stmt.name.value, (LoxClass)superclass, methods);
if (superclass != null)
{
_environment = _environment.enclosing;
}
_environment.Assign(stmt.name, klass);
return(null);
}
public object VisitClassStmt(Class stmt)
{
object superclass = null;
if (stmt.Superclass != null)
{
superclass = Evaluate(stmt.Superclass);
if (!(superclass is LoxClass))
{
throw new RuntimeException(stmt.Superclass.Name, "Superclass must be a class.");
}
}
environment.Define(stmt.Name.Lexeme, null);
if (stmt.Superclass != null)
{
environment = new LoxEnvironment(environment);
environment.Define("super", superclass);
}
Dictionary <string, LoxFunction> methods = new Dictionary <string, LoxFunction>();
foreach (Function method in stmt.Methods)
{
LoxFunction function = new LoxFunction(method, environment, method.Name.Lexeme.Equals("init"));
methods.Add(method.Name.Lexeme, function);
}
LoxClass @class = new LoxClass(stmt.Name.Lexeme, (LoxClass)superclass, methods);
if (superclass != null)
{
environment = environment.Enclosing;
}
environment.Assign(stmt.Name, @class);
return(null);
}
public object VisitClassStmt(ClassStmt stmt)
{
_scope.Define(stmt.Name.Lexeme, null);
var superClass = default(LoxClass);
if (stmt.SuperClass != null)
{
superClass = Evaluate(stmt.SuperClass) as LoxClass;
if (superClass == null)
{
throw new LoxRuntimeException(stmt.SuperClass.Name, "Base class must be a class.");
}
_scope = new Scope(_scope);
_scope.Define("super", superClass);
}
var methods = new Dictionary <string, LoxFunction>();
foreach (var method in stmt.Methods)
{
var func = new LoxFunction(method, _scope, method.Name.Lexeme.Equals("init"));
methods.Add(method.Name.Lexeme, func);
}
LoxClass klass = new LoxClass(stmt.Name.Lexeme, superClass, methods);
if (superClass != null)
{
_scope = _scope.Parent;
}
_scope.Assign(stmt.Name, klass);
return(null);
}