runtime(java): Tidy up the syntax file

Commit: 
https://github.com/vim/vim/commit/9aabcef1c8f61a7d4f2facf6a510ab6d4f2d52f3
Author: Aliaksei Budavei <0x000...@gmail.com>
Date:   Wed Jul 31 22:14:37 2024 +0200

    runtime(java): Tidy up the syntax file
    
    - Prefix all global variables with "g:".
    - Add spaces around each variable assignment operator.
    - Remove extraneous whitespace characters.
    - Remove a spurious _serializable_ Java keyword (since v1.1,
      java.io.Serializable and java.io.Externalizable interfaces
      provide an API for object serialization; see vim-6-0j).
    - Normalise the syntax definition argument order by making
      _contained_ the first argument of each such definition.
    - Normalise the argument tabulation for highlighting group
      definitions.
    
    Reference:
    
https://web.archive.org/web/20010821025330/java.sun.com/docs/books/jls/first_edition/html/1.1Update.html
    
    related: #15399
    
    Signed-off-by: Aliaksei Budavei <0x000...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/syntax/java.vim b/runtime/syntax/java.vim
index a63ae0216..bd867b297 100644
--- a/runtime/syntax/java.vim
+++ b/runtime/syntax/java.vim
@@ -8,12 +8,12 @@
 " Please check :help java.vim for comments on some of the options available.
 
 " quit when a syntax file was already loaded
-if !exists("main_syntax")
+if !exists("g:main_syntax")
   if exists("b:current_syntax")
     finish
   endif
   " we define it here so that included files can test for it
-  let main_syntax='java'
+  let g:main_syntax = 'java'
 endif
 
 let s:cpo_save = &cpo
@@ -87,18 +87,18 @@ syn match   javaOperator    "\<var\>\%(\s*(\)\@!"
 " if necessary, on the line before that (h: \@<=), trying to match
 " neither a method reference nor a qualified method invocation.
 try
-  syn match   javaOperator     "\%(\%(::\|\.\)[[:space:]
]*\)\@80<!\<yield\>"
+  syn match  javaOperator      "\%(\%(::\|\.\)[[:space:]
]*\)\@80<!\<yield\>"
   let s:ff.Peek = s:ff.LeftConstant
 catch /\<E59:/
   call s:ReportOnce(v:exception)
-  syn match   javaOperator     "\%(\%(::\|\.\)[[:space:]
]*\)\@<!\<yield\>"
+  syn match  javaOperator      "\%(\%(::\|\.\)[[:space:]
]*\)\@<!\<yield\>"
   let s:ff.Peek = s:ff.RightConstant
 endtry
 
 syn keyword javaType           boolean char byte short int long float double
 syn keyword javaType           void
 syn keyword javaStatement      return
-syn keyword javaStorageClass   static synchronized transient volatile strictfp 
serializable
+syn keyword javaStorageClass   static synchronized transient volatile strictfp
 syn keyword javaExceptions     throw try catch finally
 syn keyword javaAssert         assert
 syn keyword javaMethodDecl     throws
@@ -113,7 +113,7 @@ syn match   javaAnnotation  "@\%(\K\k*\.\)*\K\k*\>"
 syn region  javaAnnotation     transparent matchgroup=javaAnnotationStart 
start=/@\%(\K\k*\.\)*\K\k*(/ end=/)/ skip=/\/\*.\{-}\*\/\|\/\/.*$/ 
contains=javaAnnotation,javaParenT,javaBlock,javaString,javaBoolean,javaNumber,javaTypedef,javaComment,javaLineComment
 syn match   javaClassDecl      "@interface\>"
 syn keyword javaBranch         break continue nextgroup=javaUserLabelRef 
skipwhite
-syn match   javaUserLabelRef   "\k\+" contained
+syn match   javaUserLabelRef   contained "\k\+"
 syn match   javaVarArg         "\.\.\."
 syn keyword javaScopeDecl      public protected private
 syn keyword javaConceptKind    abstract final
@@ -139,7 +139,7 @@ else
   let [s:ff.Engine, s:ff.UpperCase, s:ff.LowerCase] = 
repeat([s:ff.RightConstant], 3)
 endif
 
-if exists("java_highlight_signature")
+if exists("g:java_highlight_signature")
   let [s:ff.PeekTo, s:ff.PeekFrom, s:ff.GroupArgs] = 
repeat([s:ff.LeftConstant], 3)
 else
   let [s:ff.PeekTo, s:ff.PeekFrom, s:ff.GroupArgs] = 
repeat([s:ff.RightConstant], 3)
@@ -156,7 +156,7 @@ endif
 "
 " Note that false positives may elsewhere occur whenever an identifier
 " is butted against a less-than operator.  Cf. (X<Y) and (X < Y).
-if exists("java_highlight_generics")
+if exists("g:java_highlight_generics")
   syn keyword javaWildcardBound contained extends super
 
   " Parameterised types are delegated to javaGenerics (s:ctx.gsg) and
@@ -171,15 +171,15 @@ if exists("java_highlight_generics")
   endfor
 
   unlet s:ctx
-  hi def link javaWildcardBound Question
-  hi def link javaGenericsC1 javaFuncDef
-  hi def link javaGenericsC2 javaType
+  hi def link javaWildcardBound        Question
+  hi def link javaGenericsC1   javaFuncDef
+  hi def link javaGenericsC2   javaType
 endif
 
-if exists("java_highlight_java_lang_ids")
-  let java_highlight_all=1
+if exists("g:java_highlight_java_lang_ids")
+  let g:java_highlight_all = 1
 endif
-if exists("java_highlight_all")  || exists("java_highlight_java")  || 
exists("java_highlight_java_lang")
+if exists("g:java_highlight_all") || exists("g:java_highlight_java") || 
exists("g:java_highlight_java_lang")
   " java.lang.*
   "
   " The keywords of javaR_JavaLang, javaC_JavaLang, javaE_JavaLang,
@@ -208,7 +208,7 @@ if exists("java_highlight_all")  || 
exists("java_highlight_java")  || exists("ja
   syn keyword javaC_JavaLang Boolean Character ClassLoader Compiler Double 
Float Integer Long Math Number Object Process Runtime SecurityManager String 
StringBuffer Thread ThreadGroup Byte Short Void Package RuntimePermission 
StrictMath StackTraceElement ProcessBuilder StringBuilder Module ModuleLayer 
StackWalker Record
   syn match   javaC_JavaLang "\<System\>"      " See javaDebug.
 
-  if !exists("java_highlight_generics")
+  if !exists("g:java_highlight_generics")
     " The non-interface parameterised names of java.lang members.
     exec 'syn match javaC_JavaLang "\%(\<Enum\.\)\@' . s:ff.Peek('5', '') . 
'<=\<EnumDesc\>"'
     syn keyword javaC_JavaLang Class InheritableThreadLocal ThreadLocal Enum 
ClassValue
@@ -229,10 +229,10 @@ if exists("java_highlight_all")  || 
exists("java_highlight_java")  || exists("ja
   hi def link javaC_Java javaC_
   hi def link javaE_Java javaE_
   hi def link javaX_Java javaX_
-  hi def link javaX_                javaExceptions
-  hi def link javaR_                javaExceptions
-  hi def link javaE_                javaExceptions
-  hi def link javaC_                javaConstant
+  hi def link javaX_ javaExceptions
+  hi def link javaR_ javaExceptions
+  hi def link javaE_ javaExceptions
+  hi def link javaC_ javaConstant
 
   syn keyword javaLangObject getClass notify notifyAll wait
 
@@ -251,12 +251,12 @@ if filereadable(expand("<sfile>:p:h") . "/javaid.vim")
   source <sfile>:p:h/javaid.vim
 endif
 
-if exists("java_space_errors")
-  if !exists("java_no_trail_space_error")
-    syn match  javaSpaceError  "\s\+$"
+if exists("g:java_space_errors")
+  if !exists("g:java_no_trail_space_error")
+    syn match javaSpaceError "\s\+$"
   endif
-  if !exists("java_no_tab_space_error")
-    syn match  javaSpaceError  " \+    "me=e-1
+  if !exists("g:java_no_tab_space_error")
+    syn match javaSpaceError " \+      "me=e-1
   endif
 endif
 
@@ -280,12 +280,12 @@ hi def link javaLabelNumber       javaNumber
 hi def link javaLabelCastType  javaType
 
 " Comments
-syn keyword javaTodo            contained TODO FIXME XXX
+syn keyword javaTodo           contained TODO FIXME XXX
 
-if exists("java_comment_strings")
-  syn region  javaCommentString    contained start=+"+ end=+"+ end=+$+ 
end=+\*/+me=s-1,he=s-1 
contains=javaSpecial,javaCommentStar,javaSpecialChar,@Spell
-  syn region  javaCommentString    contained start=+"""[       \x0c
]*$+hs=e+1 end=+"""+he=s-1 
contains=javaSpecial,javaCommentStar,javaSpecialChar,@Spell,javaSpecialError,javaTextBlockError
-  syn region  javaComment2String   contained start=+"+ end=+$\|"+ 
contains=javaSpecial,javaSpecialChar,@Spell
+if exists("g:java_comment_strings")
+  syn region  javaCommentString        contained start=+"+ end=+"+ end=+$+ 
end=+\*/+me=s-1,he=s-1 
contains=javaSpecial,javaCommentStar,javaSpecialChar,@Spell
+  syn region  javaCommentString        contained start=+"""[   \x0c
]*$+hs=e+1 end=+"""+he=s-1 
contains=javaSpecial,javaCommentStar,javaSpecialChar,@Spell,javaSpecialError,javaTextBlockError
+  syn region  javaComment2String contained start=+"+ end=+$\|"+ 
contains=javaSpecial,javaSpecialChar,@Spell
   syn match   javaCommentCharacter contained "'\[^']\{1,6\}'" 
contains=javaSpecialChar
   syn match   javaCommentCharacter contained "'\''" contains=javaSpecialChar
   syn match   javaCommentCharacter contained "'[^\]'"
@@ -293,9 +293,9 @@ if exists("java_comment_strings")
   syn cluster javaCommentSpecial2 
add=javaComment2String,javaCommentCharacter,javaNumber,javaStrTempl
 endif
 
-syn region  javaComment                 matchgroup=javaCommentStart 
start="/\*" end="\*/" 
contains=@javaCommentSpecial,javaTodo,javaCommentError,javaSpaceError,@Spell 
fold
-syn match   javaCommentStar     contained "^\s*\*[^/]"me=e-1
-syn match   javaCommentStar     contained "^\s*\*$"
+syn region  javaComment                matchgroup=javaCommentStart start="/\*" 
end="\*/" 
contains=@javaCommentSpecial,javaTodo,javaCommentError,javaSpaceError,@Spell 
fold
+syn match   javaCommentStar    contained "^\s*\*[^/]"me=e-1
+syn match   javaCommentStar    contained "^\s*\*$"
 syn match   javaLineComment    "//.*" 
contains=@javaCommentSpecial2,javaTodo,javaCommentMarkupTag,javaSpaceError,@Spell
 syn match   javaCommentMarkupTag contained 
"@\%(end\|highlight\|link\|replace\|start\)\>" 
nextgroup=javaCommentMarkupTagAttr,javaSpaceError skipwhite
 syn match   javaCommentMarkupTagAttr contained "\<region\>" 
nextgroup=javaCommentMarkupTagAttr,javaSpaceError skipwhite
@@ -308,7 +308,7 @@ syn match   javaCommentError contained "/\*"me=e-1 display
 hi def link javaCommentError javaError
 hi def link javaCommentStart javaComment
 
-if !exists("java_ignore_javadoc") && main_syntax != 'jsp'
+if !exists("g:java_ignore_javadoc") && g:main_syntax != 'jsp'
   " The overridable "html*" default links must be defined _before_ the
   " inclusion of the same default links from "html.vim".
   hi def link htmlComment      Special
@@ -349,42 +349,42 @@ if !exists("java_ignore_javadoc") && main_syntax != 'jsp'
 endif
 
 " match the special comment /**/
-syn match   javaComment                 "/\*\*/"
+syn match   javaComment                "/\*\*/"
 
 " Strings and constants
-syn match   javaSpecialError    contained "\."
+syn match   javaSpecialError   contained "\."
 syn match   javaSpecialCharError contained "[^']"
 " Escape Sequences (JLS-17, §3.10.7):
-syn match   javaSpecialChar     contained 
"\\%(u\x\x\x\x\|[0-3]\o\o\|\o\o\=\|[bstnfr"'\]\)"
+syn match   javaSpecialChar    contained 
"\\%(u\x\x\x\x\|[0-3]\o\o\|\o\o\=\|[bstnfr"'\]\)"
 syn region  javaString         start=+"+ end=+"+ end=+$+ 
contains=javaSpecialChar,javaSpecialError,@Spell
 syn region  javaString         start=+"""[     \x0c
]*$+hs=e+1 end=+"""+he=s-1 
contains=javaSpecialChar,javaSpecialError,javaTextBlockError,@Spell
 syn match   javaTextBlockError +"""\s*"""+
-syn region  javaStrTemplEmbExp  contained matchgroup=javaStrTempl start="\{" 
end="}" contains=TOP
+syn region  javaStrTemplEmbExp contained matchgroup=javaStrTempl start="\{" 
end="}" contains=TOP
 exec 'syn region javaStrTempl start=+\%(\.[[:space:]
]*\)\@' . s:ff.Peek('80', '') . '<="+ end=+"+ 
contains=javaStrTemplEmbExp,javaSpecialChar,javaSpecialError,@Spell'
 exec 'syn region javaStrTempl start=+\%(\.[[:space:]
]*\)\@' . s:ff.Peek('80', '') . '<="""[         \x0c
]*$+hs=e+1 end=+"""+he=s-1 
contains=javaStrTemplEmbExp,javaSpecialChar,javaSpecialError,javaTextBlockError,@Spell'
-syn match   javaCharacter       "'[^']*'" 
contains=javaSpecialChar,javaSpecialCharError
-syn match   javaCharacter       "'\''" contains=javaSpecialChar
-syn match   javaCharacter       "'[^\]'"
+syn match   javaCharacter      "'[^']*'" 
contains=javaSpecialChar,javaSpecialCharError
+syn match   javaCharacter      "'\''" contains=javaSpecialChar
+syn match   javaCharacter      "'[^\]'"
 " Integer literals (JLS-17, §3.10.1):
-syn keyword javaNumber          0 0l 0L
-syn match   javaNumber          
"\<\%(0\%([xX]\x\%(_*\x\)*\|_*\o\%(_*\o\)*\|[bB][01]\%(_*[01]\)*\)\|[1-9]\%(_*\d\)*\)[lL]\=\>"
+syn keyword javaNumber         0 0l 0L
+syn match   javaNumber         
"\<\%(0\%([xX]\x\%(_*\x\)*\|_*\o\%(_*\o\)*\|[bB][01]\%(_*[01]\)*\)\|[1-9]\%(_*\d\)*\)[lL]\=\>"
 " Decimal floating-point literals (JLS-17, §3.10.2):
 " Against "\<\d\+\>\.":
-syn match   javaNumber          "\<\d\%(_*\d\)*\."
-syn match   javaNumber          
"\%(\<\d\%(_*\d\)*\.\%(\d\%(_*\d\)*\)\=\|\.\d\%(_*\d\)*\)\%([eE][-+]\=\d\%(_*\d\)*\)\=[fFdD]\=\>"
-syn match   javaNumber          
"\<\d\%(_*\d\)*[eE][-+]\=\d\%(_*\d\)*[fFdD]\=\>"
-syn match   javaNumber          
"\<\d\%(_*\d\)*\%([eE][-+]\=\d\%(_*\d\)*\)\=[fFdD]\>"
+syn match   javaNumber         "\<\d\%(_*\d\)*\."
+syn match   javaNumber         
"\%(\<\d\%(_*\d\)*\.\%(\d\%(_*\d\)*\)\=\|\.\d\%(_*\d\)*\)\%([eE][-+]\=\d\%(_*\d\)*\)\=[fFdD]\=\>"
+syn match   javaNumber         "\<\d\%(_*\d\)*[eE][-+]\=\d\%(_*\d\)*[fFdD]\=\>"
+syn match   javaNumber         
"\<\d\%(_*\d\)*\%([eE][-+]\=\d\%(_*\d\)*\)\=[fFdD]\>"
 " Hexadecimal floating-point literals (JLS-17, §3.10.2):
-syn match   javaNumber          
"\<0[xX]\%(\x\%(_*\x\)*\.\=\|\%(\x\%(_*\x\)*\)\=\.\x\%(_*\x\)*\)[pP][-+]\=\d\%(_*\d\)*[fFdD]\=\>"
+syn match   javaNumber         
"\<0[xX]\%(\x\%(_*\x\)*\.\=\|\%(\x\%(_*\x\)*\)\=\.\x\%(_*\x\)*\)[pP][-+]\=\d\%(_*\d\)*[fFdD]\=\>"
 
 " Unicode characters
 syn match   javaSpecial "\u\x\x\x\x"
 
 " Method declarations (JLS-17, §8.4.3, §8.4.4, §9.4).
-if exists("java_highlight_functions")
+if exists("g:java_highlight_functions")
   syn cluster javaFuncParams 
contains=javaAnnotation,@javaClasses,javaGenerics,javaType,javaVarArg,javaComment,javaLineComment
 
-  if exists("java_highlight_signature")
+  if exists("g:java_highlight_signature")
     syn keyword javaParamModifier contained final
     syn cluster javaFuncParams add=javaParamModifier
     hi def link javaParamModifier javaConceptKind
@@ -393,8 +393,8 @@ if exists("java_highlight_functions")
     syn cluster javaFuncParams 
add=javaScopeDecl,javaConceptKind,javaStorageClass,javaExternal
   endif
 
-  if java_highlight_functions =~# '^indent[1-8]\=$'
-    let s:last = java_highlight_functions[-1 :]
+  if g:java_highlight_functions =~# '^indent[1-8]\=$'
+    let s:last = g:java_highlight_functions[-1 :]
     let s:indent = s:last != 't' ? repeat("\x20", s:last) : "  "
     " Try to not match other type members, initialiser blocks, enum
     " constants (JLS-17, §8.9.1), and constructors (JLS-17, §8.1.7):
@@ -430,10 +430,10 @@ if exists("java_highlight_functions")
   endif
 endif
 
-if exists("java_highlight_debug")
+if exists("g:java_highlight_debug")
   " Strings and constants
   syn match   javaDebugSpecial         contained 
"\\%(u\x\x\x\x\|[0-3]\o\o\|\o\o\=\|[bstnfr"'\]\)"
-  syn region  javaDebugString          contained start=+"+  end=+"+  
contains=javaDebugSpecial
+  syn region  javaDebugString          contained start=+"+ end=+"+ 
contains=javaDebugSpecial
   syn region  javaDebugString          contained start=+"""[   \x0c
]*$+hs=e+1 end=+"""+he=s-1 contains=javaDebugSpecial,javaDebugTextBlockError
   " The highlight groups of java{StrTempl,Debug{,Paren,StrTempl}}\,
   " share one colour by default. Do not conflate unrelated parens.
@@ -453,7 +453,7 @@ if exists("java_highlight_debug")
   syn match   javaDebugNumber          contained 
"\<0[xX]\%(\x\%(_*\x\)*\.\=\|\%(\x\%(_*\x\)*\)\=\.\x\%(_*\x\)*\)[pP][-+]\=\d\%(_*\d\)*[fFdD]\=\>"
   syn keyword javaDebugBoolean         contained true false
   syn keyword javaDebugType            contained null this super
-  syn region javaDebugParen  start=+(+ end=+)+ contained 
contains=javaDebug.*,javaDebugParen
+  syn region  javaDebugParen           contained start=+(+ end=+)+ 
contains=javaDebug.*,javaDebugParen
 
   " To make this work, define the highlighting for these groups.
   syn match javaDebug "\<System\.\%(out\|err\)\.print\%(ln\)\=\s*("me=e-1 
contains=javaDebug.* nextgroup=javaDebugParen
@@ -463,53 +463,53 @@ if exists("java_highlight_debug")
 " FIXME: What API do "trace*" belong to?
 " syn match javaDebug "\<trace[SL]\=\s*("me=e-1 contains=javaDebug.* 
nextgroup=javaDebugParen
 
-  hi def link javaDebug                 Debug
-  hi def link javaDebugString           DebugString
-  hi def link javaDebugStrTempl                 Macro
-  hi def link javaDebugTextBlockError   Error
-  hi def link javaDebugType             DebugType
-  hi def link javaDebugBoolean          DebugBoolean
-  hi def link javaDebugNumber           Debug
-  hi def link javaDebugSpecial          DebugSpecial
-  hi def link javaDebugSpecialCharacter DebugSpecial
-  hi def link javaDebugCharacter        DebugString
-  hi def link javaDebugParen            Debug
-
-  hi def link DebugString               String
-  hi def link DebugSpecial              Special
-  hi def link DebugBoolean              Boolean
-  hi def link DebugType                 Type
+  hi def link javaDebug                        Debug
+  hi def link javaDebugString          DebugString
+  hi def link javaDebugStrTempl                Macro
+  hi def link javaDebugTextBlockError  Error
+  hi def link javaDebugType            DebugType
+  hi def link javaDebugBoolean         DebugBoolean
+  hi def link javaDebugNumber          Debug
+  hi def link javaDebugSpecial         DebugSpecial
+  hi def link javaDebugSpecialCharacter        DebugSpecial
+  hi def link javaDebugCharacter       DebugString
+  hi def link javaDebugParen           Debug
+
+  hi def link DebugString              String
+  hi def link DebugSpecial             Special
+  hi def link DebugBoolean             Boolean
+  hi def link DebugType                        Type
 endif
 
 " Try not to fold top-level-type bodies under assumption that there is
 " but one such body.
 exec 'syn region javaBlock transparent start="\%(^\|^\S[^:]\+\)\@' . 
s:ff.Peek('120', '') . '<!{" end="}" fold'
 
-if exists("java_mark_braces_in_parens_as_errors")
+if exists("g:java_mark_braces_in_parens_as_errors")
   syn match javaInParen contained "[{}]"
   hi def link javaInParen javaError
 endif
 
 " catch errors caused by wrong parenthesis
-syn region  javaParenT transparent matchgroup=javaParen  start="(" end=")" 
contains=@javaTop,javaInParen,javaParenT1
-syn region  javaParenT1 transparent matchgroup=javaParen1 start="(" end=")" 
contains=@javaTop,javaInParen,javaParenT2 contained
-syn region  javaParenT2 transparent matchgroup=javaParen2 start="(" end=")" 
contains=@javaTop,javaInParen,javaParenT contained
-syn match   javaParenError      ")"
+syn region  javaParenT transparent matchgroup=javaParen start="(" end=")" 
contains=@javaTop,javaInParen,javaParenT1
+syn region  javaParenT1 contained transparent matchgroup=javaParen1 start="(" 
end=")" contains=@javaTop,javaInParen,javaParenT2
+syn region  javaParenT2 contained transparent matchgroup=javaParen2 start="(" 
end=")" contains=@javaTop,javaInParen,javaParenT
+syn match   javaParenError ")"
 " catch errors caused by wrong square parenthesis
-syn region  javaParenT transparent matchgroup=javaParen  start="\[" end="\]" 
contains=@javaTop,javaParenT1
-syn region  javaParenT1 transparent matchgroup=javaParen1 start="\[" end="\]" 
contains=@javaTop,javaParenT2 contained
-syn region  javaParenT2 transparent matchgroup=javaParen2 start="\[" end="\]" 
contains=@javaTop,javaParenT  contained
-syn match   javaParenError      "\]"
+syn region  javaParenT transparent matchgroup=javaParen start="\[" end="\]" 
contains=@javaTop,javaParenT1
+syn region  javaParenT1 contained transparent matchgroup=javaParen1 start="\[" 
end="\]" contains=@javaTop,javaParenT2
+syn region  javaParenT2 contained transparent matchgroup=javaParen2 start="\[" 
end="\]" contains=@javaTop,javaParenT
+syn match   javaParenError "\]"
 
-hi def link javaParenError     javaError
+hi def link javaParenError javaError
 
-" Lambda expressions (JLS-17, §15.27) and method references (JLS-17,
-" §15.13).
-if exists("java_highlight_functions")
+" Lambda expressions (JLS-17, §15.27) and method reference expressions
+" (JLS-17, §15.13).
+if exists("g:java_highlight_functions")
   syn match javaMethodRef ":::\@!"
   hi def link javaMethodRef javaFuncDef
 
-  if exists("java_highlight_signature")
+  if exists("g:java_highlight_signature")
     let s:ff.LambdaDef = s:ff.LeftConstant
   else
     let s:ff.LambdaDef = s:ff.RightConstant
@@ -543,8 +543,8 @@ endif
 " Note that the syntax file "aidl.vim" relies on its availability.
 syn cluster javaTop contains=TOP,javaTopEnumDeclaration
 
-if !exists("java_minlines")
-  let java_minlines = 10
+if !exists("g:java_minlines")
+  let g:java_minlines = 10
 endif
 
 " Note that variations of a /*/ balanced comment, e.g., /*/*/, /*//*/,
@@ -553,7 +553,7 @@ endif
 " to make synchronisation start further towards file's beginning by
 " bumping up g:java_minlines or issuing ':syntax sync fromstart' or
 " preferring &foldmethod set to 'syntax'.
-exec "syn sync ccomment javaComment minlines=" . java_minlines
+exec "syn sync ccomment javaComment minlines=" . g:java_minlines
 
 " The default highlighting.
 hi def link javaLambdaDef              Function
@@ -574,8 +574,8 @@ hi def link javaClassDecl           javaStorageClass
 hi def link javaScopeDecl              javaStorageClass
 hi def link javaConceptKind            NonText
 
-hi def link javaBoolean                Boolean
-hi def link javaSpecial                Special
+hi def link javaBoolean                        Boolean
+hi def link javaSpecial                        Special
 hi def link javaSpecialError           Error
 hi def link javaSpecialCharError       Error
 hi def link javaString                 String
@@ -587,17 +587,17 @@ hi def link javaError                     Error
 hi def link javaTextBlockError         Error
 hi def link javaStatement              Statement
 hi def link javaOperator               Operator
-hi def link javaComment                Comment
+hi def link javaComment                        Comment
 hi def link javaDocComment             Comment
 hi def link javaLineComment            Comment
 hi def link javaConstant               Constant
-hi def link javaTypedef                Typedef
+hi def link javaTypedef                        Typedef
 hi def link javaTodo                   Todo
 hi def link javaAnnotation             PreProc
 hi def link javaAnnotationStart                javaAnnotation
 
 hi def link javaCommentTitle           SpecialComment
-hi def link javaDocTags                Special
+hi def link javaDocTags                        Special
 hi def link javaDocCodeTag             Special
 hi def link javaDocSnippetTag          Special
 hi def link javaDocParam               Function
@@ -617,8 +617,8 @@ endif
 
 let b:current_syntax = "java"
 
-if main_syntax == 'java'
-  unlet main_syntax
+if g:main_syntax == 'java'
+  unlet g:main_syntax
 endif
 
 let b:spell_options = "contained"

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