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

[Hannes Wallnöfer]

On Wed, 26 Jun 2024 23:00:27 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.

I'm not sure if this is intentional (it makes changes easier to review), but I notice that imports of classes in the new package are generally mixed with classes remaining in the old package, and therefore not in alphabetic order.

-------------

PR Review: https://git.openjdk.org/jdk/pull/19916#pullrequestreview-2148044997