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runtime(java): Provide support for syntax preview features

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Introduce a new API variable "g:java_syntax_previews" whose
value must be a list of syntax preview feature numbers.

Enumerate the currently supported numbers in a table at the
end of the documentation entry for "ft-java-syntax".

Also, disable the recognition of String Templates.  Despite
the withdrawal of this preview feature in its proposed form
from the upcoming JDK 23 release and the fact that the JDK
22 release is coming to EOL this September, an earlier
iteration of this preview feature was included in JDK 21
(LTS) whose EOL is projected to fall due in late 2028 and,
therefore, retain the current implementation.

Define "g:java_syntax_previews" and include number 430 in
its list to enable the recognition of String Templates:
------------------------------------------------------------
	let g:java_syntax_previews = [430]
------------------------------------------------------------

References:
https://openjdk.org/jeps/430 (Preview)
https://openjdk.org/jeps/459 (Second Preview)
https://openjdk.org/jeps/465 (Third Preview)
https://mail.openjdk.org/pipermail/amber-spec-experts/2024-April/004106.html

closes: #15579

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Aliaksei Budavei
2024-08-27 22:32:13 +02:00
committed by Christian Brabandt
parent d56c451e1c
commit 8556e23ee9
11 changed files with 152 additions and 96 deletions
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runtime/syntax/testdir/dumps/java_string_02.dump
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