[jira] [Commented] (MRESOLVER-336) Unexpected handling of qualifiers in GenericVersionScheme

["David M. Lloyd (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MRESOLVER-336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17694645#comment-17694645 ] 

David M. Lloyd commented on MRESOLVER-336:
------------------------------------------

Another symptom of what might be the same problem:

{code}
1. 0.foo.1.2.3 -> 0.foo.1.2.3; tokens: [0, foo, 1, 2, 3]
   0.foo.1.2.3 > foo.1.2.3
2. foo.1.2.3 -> foo.1.2.3; tokens: [foo, 1, 2, 3]
{code}

{code}
1. 0.foo -> 0.foo; tokens: [0, foo]
   0.foo == foo
2. foo -> foo; tokens: [foo]
{code}

> Unexpected handling of qualifiers in GenericVersionScheme
> ---------------------------------------------------------
>
>                 Key: MRESOLVER-336
>                 URL: https://issues.apache.org/jira/browse/MRESOLVER-336
>             Project: Maven Resolver
>          Issue Type: Bug
>    Affects Versions: 1.9.5
>            Reporter: David M. Lloyd
>            Priority: Major
>
> Given the following:
> {code}
> $ jbang --main=org.eclipse.aether.util.version.GenericVersionScheme org.apache.maven.resolver:maven-resolver-util:1.9.5 0.0.0.ga.ga.foo foo
> Display parameters as parsed by Maven Resolver (in canonical form and as a list of tokens) and comparison result:
> 1. 0.0.0.ga.ga.foo -> 0.0.0.ga.ga.foo; tokens: [0, 0, 0, foo]
>    0.0.0.ga.ga.foo == foo
> 2. foo -> foo; tokens: [foo]
> {code}
> This is expected iff zero-prefixed qualifiers are considered equal to the bare qualifier, which does seem to be the case *mostly*. However, we also have this:
> {code}
> $ jbang --main=org.eclipse.aether.util.version.GenericVersionScheme org.apache.maven.resolver:maven-resolver-util:1.9.5 ga.ga.foo foo
> Display parameters as parsed by Maven Resolver (in canonical form and as a list of tokens) and comparison result:
> 1. ga.ga.foo -> ga.ga.foo; tokens: [0, 0, foo]
>    ga.ga.foo < foo
> 2. foo -> foo; tokens: [foo]
> {code}
> In this case we have "zero"-valued qualifiers but no leading numerical segment, which unexpectedly changes the parsing rules. I would expect {{ga.ga.foo == foo}} as above. Is this a bug? Is there an explanation for this behavior? The spec doesn't seem to directly address this.



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