commit e73e5b889b52675a9ea58cf154235c7f25d107d5
author Aliaksei Budavei <0x000c70@gmail.com> Wed Jul 24 20:15:15 2024 +0200
committer Christian Brabandt <cb@256bit.org> Wed Jul 24 20:17:43 2024 +0200
tree e19887bf52a1e1dce22b9eb2a21e80c511e3c99f
parent df77c8ad3974e44df2e588de5f465072371cab69

runtime(java): Optionally highlight the :: token for method references

This token will be highlighted, similar to the arrow of
lambda expressions, whenever "g:java_highlight_functions" is
defined.

Also:

- Improve the recognition of _switch-case_ labels
  (D-Cysteine).
- Remove insignificant empty statements in syntax test
  files.

closes: #15322

References:
https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.13
https://github.com/fleiner/vim/pull/1

Co-authored-by: D-Cysteine <54219287+D-Cysteine@users.noreply.github.com>
Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/java.vim

diff --git a/runtime/syntax/java.vim b/runtime/syntax/java.vim
index 4beeaad..9c4964d 100644
--- a/runtime/syntax/java.vim
+++ b/runtime/syntax/java.vim
@@ -3,7 +3,7 @@
 " Maintainer:		Aliaksei Budavei <0x000c70 AT gmail DOT com>
 " Former Maintainer:	Claudio Fleiner <claudio@fleiner.com>
 " Repository:		https://github.com/zzzyxwvut/java-vim.git
-" Last Change:		2024 Jun 22
+" Last Change:		2024 Jul 23
 
 " Please check :help java.vim for comments on some of the options available.
 
@@ -260,7 +260,7 @@
   endif
 endif
 
-exec 'syn match javaUserLabel "^\s*\<\K\k*\>\%(\<default\>\)\@' . s:ff.Peek('7', '') . '<!\s*:"he=e-1'
+exec 'syn match javaUserLabel "^\s*\<\K\k*\>\%(\<default\>\)\@' . s:ff.Peek('7', '') . '<!\s*::\@!"he=e-1'
 syn region  javaLabelRegion	transparent matchgroup=javaLabel start="\<case\>" matchgroup=NONE end=":\|->" contains=javaLabelCastType,javaLabelNumber,javaCharacter,javaString,javaConstant,@javaClasses,javaGenerics,javaLabelDefault,javaLabelVarType,javaLabelWhenClause
 syn region  javaLabelRegion	transparent matchgroup=javaLabel start="\<default\>\%(\s*\%(:\|->\)\)\@=" matchgroup=NONE end=":\|->" oneline
 " Consider grouped _default_ _case_ labels, i.e.
@@ -497,8 +497,12 @@
 
 hi def link javaParenError	javaError
 
-" Lambda expressions (JLS-17, §15.27).
+" Lambda expressions (JLS-17, §15.27) and method references (JLS-17,
+" §15.13).
 if exists("java_highlight_functions")
+  syn match javaMethodRef ":::\@!"
+  hi def link javaMethodRef javaFuncDef
+
   if exists("java_highlight_signature")
     let s:ff.LambdaDef = s:ff.LeftConstant
   else