How to make Bison not exit when it calls yyerror - yacc

When my parser is scanning a source file and some syntax is incorrect, and it calls yyerror, I want it to display the error message, but continue parsing the file to potentially display more errors. However, every time the parser calls yyerror, it displays the error message and then exits? What can I do?

Here is your solution: http://web.mit.edu/gnu/doc/html/bison_9.html

Related

How to change an error code when token fails validation

For compliance reasons, we need to change the error returned from a failed token validation from invalid_grant to invalid_request.
The logic that drives this is in TokenRequestValidator.cs specifically the method ValidateResourceOwnerCredentialRequestAsync. If you peruse the code you will see that everything it returns is OidcConstants.TokenErrors.InvalidGrant.
My first thought for this was to override the event sink to look for a TokenIssuedFailureEvent with an Error equal to invalid_grant. You can see that the event is dispatched when there is an error in TokenEndpoint.cs but when the event is raised, the error is wrapped in the TokenIssuedFailureEvent and the error is copied by value which means that this approach won't work.
Is there a way that I can alter this behaviour without having to make a code change to IdentityServer4 itself?
Thanks in advance!

Why Qt5 warns about a miisng signal, while it uses the signal?

I use the line
connect(ui->Ysim, SIGNAL(ui->Ysim->StartButton_Get()->click()),
this,SLOT(on_startButton_clicked()));
It works fine, the debugger takes me to the on_clicked method.However, I receive the message that
QObject::connect: No such signal
Do I need to provide another syntax? Or ho to get rid of the warning? (I guess it has some reason)

Is there any reserved space form custom application error codes?

We need to define a few application specific error codes (exit status). Our use case: uninstaller si calling application to do online deactivation, which may fail for multiple reasons (no internet, internal server error,...). Is there any reserved interval for application specific error codes, so nothing would have chance to interfere?
Thanks
Your application gets to define its exit status however it likes.
Interpretation is completely up to the invoker. If that happens to be a shell, it will interpret any nonzero code as an error.

Dojo informative message sent after xhrPost

Let's say that a request is sent to server via xhrPost and server finds that request needs more information to be processed (for example a variable is missing), so, a response is sent back to client informing that request may have not been completely processed and this message is shown in a dialog box.
I was doing it sending from server an HTTP 202 status code, which I believe is not correct, and treating it on load function, where this message was displayed on a dialog box. But if I respond with some HTTP error code (ex: 400) the error is displayed in console (Note: in this case the message is treated in error function), as well as in my dialog box.
What is the best and correct way to do it?
Note that it is called a load handler, not a success handler.
The load hander is for valid, well formatted responses. These can contain a verity of status codes generated by your server side app that indicates success, failure, or something in between.
The error is just that, the server blew up while trying to process the request and whatever you get back is probably not something your widget was written to expect. For this reason, I recommend using the same error handler across your whole app.
The dojo documentation states:
Sometimes xhrGet calls will fail. Often these are 404 errors or server errors such as 500. The error parameter is another callback function that is only invoked when an error occurs. This allows you to control what happens when an error occurs without having to put a lot of logic into your load function to check for error conditions. The first parameter passed to the error function is a JavaScript Error object indicating what the failure was. Dojo doc

Error handling in wxWidgets

Could someone provide info about error-handling in wxWidgets or a pointer to documentation?
Specifically, I discovered this behavior: I try to create a wxImage from a file. This is in an event-handler. The file is not present. The call to the image constructor does not throw an exception. (I understand that no wxWidgets code throws exceptions.) A call to image.Ok() returns false. Fine. But after my event-handler exits, wxWidgets gratuitously pops up an error message dialog. That's okay for this particular application, but I wonder how to stop that from happening if I want to handle the error myself. I suspect that the dialog is coming from an event-handler, but I search for things like EVT_ERROR, and came up empty.
There is the class wxLogNull for suppressing those log messages. See http://docs.wxwidgets.org/stable/wx_wxlognull.html#wxlognull where also an example is given.
Read the wxLog overview for more details on how wxWidgets handles this.
You can define your own log target which would throw an exception if an error message is logged. Of course, then you'd probably need to catch it in your event handler anyhow as you probably don't want to just give the user a relatively useless "File couldn't be opened" message but rather a "Image couldn't be opened" one. And if you do this, then why not just test for file.IsOk() directly and use wxLogError() yourself? IOW you can do what you want but I don't really see how is it better than the traditional exception-less way of doing things in this particular case.