Re: [Codenarc-user] Writing CodeNarc rules

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I am clearly going to have to get intimately familiar with AstUtil, but I 
don't think that solves my particular need.

The standard I am trying to enforce is that a Grails action should consist 
of a try/catch block that catches java.lang.Exception (debating 
java.lang.Throwable). The idea here is that the controller should at 
minimum log the exception and provide some appropriate user interaction 
when an exception occurs and not throw it back to the Grails 
infrastructure where unfriendly things happen in the UI.

Obviously most anything caught would implement Exception, but that is very 
different from Exception being caught.

Thanks!

From:   "Hamlet D'Arcy" <ham...@gm...>
To:     AGo...@cf...
Cc:     cod...@li...
Date:   09/15/2016 07:57 AM
Subject:        Re: [Codenarc-user] Writing CodeNarc rules

Sounds like you're looking for AstUtils.classNodeImplementsType  :)

    /**
     * This method tells you if a ClassNode implements or extends a 
certain class.
     * @param node
     *      the node
     * @param target
     *      the class
     * @return
     * true if the class node 'is a' target
     */

On Thu, Sep 15, 2016 at 12:14 AM, <AGo...@cf...> wrote:
Thanks to the advice here I have made some good progress. I have a rule 
that is doing pretty much what I want, but I would like to add one more 
thing that is giving me trouble.

I have the TryCatchStatement, and from there I can get the CatchStatement 
list. For each CatchStatement I can get the ClassNode for the exception 
type and from there I can check the ClassNode name to see if what is being 
caught is an Exception.

I would like to go the extra step and confirm that the CatchStatement is 
catching a java.lang.Exception and not just a Throwable someone decided to 
name Exception. Is that possible?

I could add another rule that makes sure none of the compiled code names a 
class "Exception", but it seems like I should be able to check the package 
of the class being caught. If someone writes their own java.lang.Exception 
class then I think we have gone beyond my scope, but there are definitely 
names that get reused across packages and this appears to be an important 
capability.

Thanks!

-Andrew Goodspeed

From:        Andy Goodspeed/IS/CFG
To:        cod...@li...
Date:        09/06/2016 06:32 PM
Subject:        Re: [Codenarc-user] Writing CodeNarc rules

Thanks Hamlet! That should be very helpful. Thanks also to Chris Mair who 
had some helpful suggestions.

I will hope to get a chance to try them both out; still digging out after 
a week off. Once I get back to this I will report back.

Thanks again!

-Andrew Goodspeed

From:        "Hamlet D'Arcy" <ham...@gm...>
To:        AGo...@cf...
Cc:        cod...@li...
Date:        09/01/2016 09:24 AM
Subject:        Re: [Codenarc-user] Writing CodeNarc rules

Not sure if you ever got an answer to this... 

Here is the latest Javadoc for MethodNode: 
http://docs.groovy-lang.org/latest/html/api/org/codehaus/groovy/ast/MethodNode.html

A MethodNode only ever has one Statement! so if your Method has only a 
TryCatchStatement then you know nothing follows it. 
If your method has-a BlockStatement then your method will be several 
statements long. 

The best way to explore is to write more unit tests and just look and see 
what is in the AST! 

On Thu, Aug 18, 2016 at 9:18 PM, <AGo...@cf...> wrote:
Hello all.

I am trying to write a CodeNarc rule and am struggling with just how to 
use the AST code visitor support (or anything else) to get were I want to 
go. Does anyone know of a resource that might be helpful and/or give me 
some firsthand assistance? I have looked at all of the obvious ones from 
the CodeNarc site as well as the distributed rules, google searches, etc.

I am trying to write a rule that checks to make sure the body of 
particular methods consists entirely of a try/catch block where Exception 
is caught. I have gotten as far as verifying the first statement in the 
method is a try/catch statement using an AbstractMethodVisitor but am 
struggling a bit in figuring out how to make sure there is no statement 
following it in the method.

This is where I am on my astVisitorClass.

classMyTestAstVisitor extendsAbstractMethodVisitor  {
    @Override
    voidvisitMethod(MethodNode methodNode) {
        if(Modifier.isPublic(methodNode.modifiers)) {
            if(AstUtil.isEmptyBlock(methodNode.code)) {
                addViolation(methodNode, "Action ${methodNode.name} in ${
currentClassName} is empty")
            } else{
                deftryCatchStatement = methodNode.firstStatement
                if(!(tryCatchStatement instanceofTryCatchStatement)) {
                    addViolation(methodNode, "First statement of action 
${methodNode.name} in ${currentClassName} is ${tryCatchStatement.class.
name}")
                } else{
                    // try/catch statement, but nothing more?
                }
            }
        }
    }
}

I am running with CodeNarc 0.22 and Grails 2.2.4/Groovy 2.0.8.

Thanks for any insight.

-Andrew Goodspeed
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