Re: [Codenarc-user] Writing CodeNarc rules

[Hamlet D'A. <ham...@gm...>]

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*
> <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...*
> <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.
>
> *class*MyTestAstVisitor *extends*AbstractMethodVisitor  {
>     @Override
>     *void*visitMethod(MethodNode methodNode) {
>         *if*(Modifier.*isPublic*(methodNode.modifiers)) {
>             *if*(AstUtil.*isEmptyBlock*(methodNode.code)) {
>                 addViolation(methodNode, "Action ${methodNode.name} in ${
> currentClassName} is empty")
>             } *else*{
>                 *def*tryCatchStatement = methodNode.firstStatement
>                 *if*(!(tryCatchStatement *instanceof*TryCatchStatement)) {
>                     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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> Hamlet D'Arcy
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-- 
Hamlet D'Arcy
ham...@gm...