> Please review an update to improve the support, where appropriate, for nested
> inline tags.
>
> It has always been the case that certain inline tags allow text and HTML to
> appear within them. With tags like `{@return}` and `{@summary}` it becomes
> desirable to also generally allow nested inline tags to appear in those
> places as well. The work for this was started with the support for
> `{@return}` [JDK-8075778](https://bugs.openjdk.java.net/browse/JDK-8075778),
> but applying the work more generally was out of scope at the time. This
> change completes the work that was started then.
>
> The work can be grouped into 4 parts, in 3 commits.
>
> ## Commit 1
>
> * Update `DocCommentParser` to syntactically allow nested inline tags in
> situations that permit text and HTML
> * Update the downstream code to semantically limit nestg where it does not
> make sense, and provide new tests to verify the behavior.
>
> A family of new tests are added, each testing the ability to put an inline
> tag within another of the same kind, with and without doclint being enabled.
> In addition, test cases are added placing a simple instance `{@value}` in an
> enclosing tag: this is a useful case just because the expansion is plain text
> and therefore valid in all situations. Additional tests and test cases can
> be added as needed.
>
> This commit left the `{@index}` tag generating "bad" code when it was nested.
> The error was "reference to an undeclared ID". The (temporary) solution was
> to disable the automatic link checking for this specific subtest.
>
> ## Commit 2
>
> * `HtmlDocletWriter` and `TagletWriterImpl ` pass around a pair of booleans
> `isFirstSentence` and `inSummary` to help determine the output to be
> generated. Conceptually, a third value is added to that group: a set
> containing the set of nested tag kinds, so that it is possible to determine
> the enclosing tags for a tag. But, rather than add a third parameter to be
> passed around, the 3 are grouped into a new class `TagletWriterImpl.Context`
> which encapsulates the two booleans and the new set. The new class is added
> in a way to minimize code churn. No tests are affected by this change: all
> continue to pass.
>
> ## Commit 3
>
> * The new `Context#inTags` field is used to help improve the behavior of
> nested `{@index}` tags even when used incorrectly, with warnings disabled.
> As a result, the temporary change in the first commit to disable automatic
> link checking in one of the test cases is reverted.
>
> <hr>
>
> The introduction of the new Context class is arguably more general than we
> need at this time, but it clears up some erratic and inconsistent use of the
> `isFirstSentence` and `inSummary` booleans. The new class also provides a
> better framework for any complex new inline tags we may add in future. We
> might want to change the `Set<DocTree.Kind>` to some other collection at some
> point, if needs be (a stack, for example.) We might also want to move more
> information into the `Context`, such as the related `Element` that is
> otherwise ubiquitously passed around.
>
> The overall cleanup also revealed some latent bugs in the code, that were
> hidden in some of the tests. Most notable was that there were still some
> cases were `<` and `>` were not being correctly escaped as `<` and `>`
> leading to output in some tests of the form `List<String>` ! This triggered
> a minor cleanup/rewrite of the beginning of
> `HtmlDocletWriter.seeTagsToContent` which was previously a bit too liberal
> with the use of `new RawHtml`! The other minor cleanup was more consistent
> handling of whitespace at the end of the first sentence, as will be seen in a
> couple of places in one of the tests that was updated.
Jonathan Gibbons has updated the pull request incrementally with one additional
commit since the last revision:
Address review comments
-------------
Changes:
- all: https://git.openjdk.java.net/jdk/pull/2369/files
- new: https://git.openjdk.java.net/jdk/pull/2369/files/a6f3eb32..bbb98e6b
Webrevs:
- full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2369&range=03
- incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2369&range=02-03
Stats: 39 lines in 5 files changed: 15 ins; 13 del; 11 mod
Patch: https://git.openjdk.java.net/jdk/pull/2369.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/2369/head:pull/2369
PR: https://git.openjdk.java.net/jdk/pull/2369
