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Subject: Re: [PATCH 1/1] docs: automarkup.py: Fix invalid HTML link output and
 broken URI fragments
To:     mchehab+huawei@kernel.org, nfraprado@protonmail.com,
        corbet@lwn.net, linux-doc@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org
References: <20211216192704.413216-1-james.clark@arm.com>
 <20211216192704.413216-2-james.clark@arm.com>
From:   James Clark <james.clark@arm.com>
Message-ID: <9f490126-ef08-e3f3-3f5b-1a55874d8d7c@arm.com>
Date:   Tue, 4 Jan 2022 14:17:43 +0000
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On 16/12/2021 19:27, James Clark wrote:
> Since commit d18b01789ae5 ("docs: Add automatic cross-reference for
> documentation pages"), references that were already explicitly defined
> with "ref:" and reffered to other pages with a path have been doubled.
> This is reported as the following error by Firefox:
> 
>   Start tag "a" seen but an element of the same type was already open.
>   End tag "a" violates nesting rules.
> 
> As well as the invalid HTML, this also obscures the URI fragment links
> to subsections because the second link overrides the first. For example
> on the page admin-guide/hw-vuln/mds.html the last link should be to the
> "Default Mitigations" subsection using a # URI fragment:
> 
>   admin-guide/hw-vuln/l1tf.html#default-mitigations
> 
> But it is obsured by a second link to the whole page:
> 
>   admin-guide/hw-vuln/l1tf.html
> 

Bump. Is there a way this can be merged if there are no objections? It's
preventing me from adding links in the docs.

Thanks
James

> The full HTML with the double <a> tags looks like this:
> 
>   <a class="reference internal" href="l1tf.html#default-mitigations">
>     <span class="std std-ref">
>       <a class="reference internal" href="l1tf.html">
>         <span class="doc">L1TF - L1 Terminal Fault</span>
>       </a>
>     </span>
>   </a>
> 
> After this commit, there is only a single link:
> 
>   <a class="reference internal" href="l1tf.html#default-mitigations">
>     <span class="std std-ref">Documentation/admin-guide/hw-vuln//l1tf.rst</span>
>   </a>
> 
> Now that the second link is removed, the browser correctly jumps to the
> default-mitigations subsection when clicking the link.
> 
> The fix is to check that nodes in the document to be modified are not
> already references. A reference is counted as any text that is a
> descendant of a reference type node. Only plain text should be converted
> to new references, otherwise the doubling occurs.
> 
> Testing
> =======
> 
>  * Test that the build stdout is the same (ignoring ordering), and that
>    no new warnings are printed.
> 
>  * Diff all .html files and check that the only modifications occur
>    to the bad double links.
> 
>  * The auto linking of bare references to pages without "ref:" is still
>    working.
> 
> Fixes: d18b01789ae5 ("docs: Add automatic cross-reference for
>        documentation pages")
> Signed-off-by: James Clark <james.clark@arm.com>
> ---
>  Documentation/sphinx/automarkup.py | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/sphinx/automarkup.py b/Documentation/sphinx/automarkup.py
> index acf5473002f3..3fee247b55b3 100644
> --- a/Documentation/sphinx/automarkup.py
> +++ b/Documentation/sphinx/automarkup.py
> @@ -280,10 +280,22 @@ def auto_markup(app, doctree, name):
>      # avoid adding cross-references to functions that have been explicitly
>      # marked with cc:func:.
>      #
> +    def text_but_not_a_reference(node):
> +        if not isinstance(node, nodes.Text) or isinstance(node.parent, nodes.literal):
> +            return False
> +
> +        child_of_reference = False
> +        parent = node.parent
> +        while parent:
> +            if isinstance(parent, nodes.Referential):
> +                child_of_reference = True
> +                break
> +            parent = parent.parent
> +        return not child_of_reference
> +
>      for para in doctree.traverse(nodes.paragraph):
> -        for node in para.traverse(nodes.Text):
> -            if not isinstance(node.parent, nodes.literal):
> -                node.parent.replace(node, markup_refs(name, app, node))
> +        for node in para.traverse(condition=text_but_not_a_reference):
> +            node.parent.replace(node, markup_refs(name, app, node))
>  
>  def setup(app):
>      app.connect('doctree-resolved', auto_markup)
>