runtime(java): Improve the matching of lambda expressions (#14880)
- Distinguish some formal parameters.
- Support multi-line definitions.
Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/java.vim b/runtime/syntax/java.vim
index 9867b14..5ba724d 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 May 10
+" Last Change: 2024 May 30
" Please check :help java.vim for comments on some of the options available.
@@ -348,7 +348,6 @@
exec 'syn region javaFuncDef start=/' . s:ff.Engine('\%#=2', '') . '^\s\+\%(\%(@\%(\K\k*\.\)*\K\k*\>\)\s\+\)*\%(p\%(ublic\|rotected\|rivate\)\s\+\)\=\%(\%(abstract\|default\)\s\+\|\%(\%(final\|\%(native\|strictfp\)\|s\%(tatic\|ynchronized\)\)\s\+\)*\)\=\%(<.*[[:space:]-]\@' . s:ff.Peek('1', '') . '<!>\s\+\)\=\%(void\|\%(b\%(oolean\|yte\)\|char\|short\|int\|long\|float\|double\|\%(\<\K\k*\>\.\)*\<' . s:ff.UpperCase('[$_[:upper:]]', '[^a-z0-9]') . '\k*\>\%(<[^(){}]*[[:space:]-]\@' . s:ff.Peek('1', '') . '<!>\)\=\)\%(\[\]\)*\)\s\+\<' . s:ff.LowerCase('[$_[:lower:]]', '[^A-Z0-9]') . '\k*\>\s*(/ end=/)/ skip=/\/\*.\{-}\*\/\|\/\/.*$/ contains=@javaFuncParams'
endif
- exec 'syn match javaLambdaDef "\<\K\k*\>\%(\<default\>\)\@' . s:ff.Peek('7', '') . '<!\s*->"'
syn match javaBraces "[{}]"
endif
@@ -421,9 +420,26 @@
hi def link javaParenError javaError
+" Lambda expressions (JLS-17, §15.27).
if exists("java_highlight_functions")
" Make ()-matching definitions after the parenthesis error catcher.
- exec 'syn match javaLambdaDef "\k\@' . s:ff.Peek('4', '') . '<!(\%(\k\|[[:space:]<>?\[\]@,.]\)*)\s*->"'
+ "
+ " Match: ([@A [@B ...] final] var a[, var b, ...]) ->
+ " | ([@A [@B ...] final] T[<α>][[][]] a[, T b, ...]) ->
+ " There is no recognition of expressions interspersed with comments
+ " or of expressions whose parameterised parameter types are written
+ " across multiple lines.
+ exec 'syn match javaLambdaDef "\k\@' . s:ff.Peek('4', '') . '<!([[:space:]\n]*\%(\%(@\%(\K\k*\.\)*\K\k*\>\%((\_.\{-1,})\)\{-,1}[[:space:]\n]\+\)*\%(final[[:space:]\n]\+\)\=\%(\<\K\k*\>\.\)*\<\K\k*\>\%(<[^(){}]*[[:space:]-]\@' . s:ff.Peek('1', '') . '<!>\)\=\%(\%(\%(\[\]\)\+\|\.\.\.\)\)\=[[:space:]\n]\+\<\K\k*\>\%(\[\]\)*\%(,[[:space:]\n]*\)\=\)\+)[[:space:]\n]*->" contains=javaAnnotation,javaParamModifier,javaLambdaVarType,javaType,@javaClasses,javaVarArg'
+ " Match: () ->
+ " | (a[, b, ...]) ->
+ exec 'syn match javaLambdaDef "\k\@' . s:ff.Peek('4', '') . '<!([[:space:]\n]*\%(\<\K\k*\>\%(,[[:space:]\n]*\)\=\)*)[[:space:]\n]*->"'
+ " Match: a ->
+ exec 'syn match javaLambdaDef "\<\K\k*\>\%(\<default\>\)\@' . s:ff.Peek('7', '') . '<![[:space:]\n]*->"'
+
+ syn keyword javaParamModifier contained final
+ hi def link javaParamModifier javaConceptKind
+ syn keyword javaLambdaVarType contained var
+ hi def link javaLambdaVarType javaOperator
endif
" The @javaTop cluster comprises non-contained Java syntax groups.