RFR: 8335122: Reorganize internal low-level support for HTML in jdk.javadoc [v9]

[Hannes Wallnöfer]

On Fri, 2 Aug 2024 17:26:48 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Please review a change to reorganize the internal low-level support for HTML in the jdk.javadoc module.
>> 
>> Hitherto, there are two separate sets of classes for low-level support for HTML in the `jdk.javadoc` module: one, in doclint, focused on reading and checking classes, the other, in the standard doclet, focused on generating HTML. This PR merges those two sets, into a new package `jdk.javadoc.internal.html` that is now used by both `doclint` and the standard doclet.
>> 
>> There was a naming "anti-clash" -- `HtmlTag` in `doclint` vs `TagName` in the standard doclet. The resolution is to use `HtmlTag`, since the merged class is more than just the tag name.
>> 
>> A few minor bugs were found and fixed.   Other minor cleanup was done, but otherwise, there should be no big surprises here. But, one small item of note: `enum HtmlStyle` was split into `interface HtmlStyle` and `enum HtmlStyles implements HtmlStyle` to avoid having a doclet-specific enum class in the new `internal.html` package.  The naming follows `HtmlId` and `HtmlIds`.
>> 
>> There is no attempt at this time to simplify `HtmlTag` and `HtmlAttr` to remove support for older versions of HTML.
>
> Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix trailing whitespace

Thanks for adding the comments, looks good to me.

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Marked as reviewed by hannesw (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19916#pullrequestreview-2216095763