public object visitVariableExpr(Expr.Variable expr)
{
//jlox: (!scopes.isEmpty() && scopes.peek().get(expr.name.lexeme) == Boolean.FALSE)
if (scopes.Count > 0 && scopes[scopes.Count - 1].ContainsKey(expr.name.lexeme))
{
if (scopes[scopes.Count - 1][expr.name.lexeme] == false) // declared but not yet defined
{
Lox.error(expr.name, "Cannot read local variable in its own initializer.");
}
}
resolveLocal(expr, expr.name);
return(null);
}
private Stmt classDeclaration()
{
Token name = consume(TokenType.IDENTIFIER, "Expect class name.");
Expr.Variable superclass = null;
if (match(TokenType.LESS))
{
consume(TokenType.IDENTIFIER, "Expect superclass name.");
superclass = new Expr.Variable(previous());
}
consume(TokenType.LEFT_BRACE, "Expect '{' before class body.");
List <Stmt.Function> methods = new List <Stmt.Function>();
while (!check(TokenType.RIGHT_BRACE) && !isAtEnd())
{
methods.Add(function("method"));
}
consume(TokenType.RIGHT_BRACE, "Expect '}' after class body.");
return(new Stmt.Class(name, superclass, methods));
}
public string visitVariableExpr(Expr.Variable expr)
{
return("");
}
public object visitVariableExpr(Expr.Variable expr)
{
return(lookUpVariable(expr.name, expr));
}
public Class(Token name, Expr.Variable superclass, List <Stmt.Function> methods)
{
this.name = name;
this.superclass = superclass;
this.methods = methods;
}