runtime(java): Recognise _when_ clauses in _switch_ blocks
Commit:
https://github.com/vim/vim/commit/9ecf02cd5f5feabe096f66cd5f503a822c78793f
Author: Aliaksei Budavei <[email protected]>
Date: Wed Feb 28 21:30:22 2024 +0100
runtime(java): Recognise _when_ clauses in _switch_ blocks
Also:
- distinguish _yield_ when used as a contextual keyword from
when used qualified as a method or a method reference (as
can be seen in testdir/input/java_switch.java, variables
and method declarations named _yield_ will be recognised
as the namesake keyword--consider picking other names for
variables, and defining g:java_highlight_functions to have
method names painted; since _yield_ statements can have
trailing parens, they must be recognised as statements,
for only qualified _yield_ method calls are supported);
- recognise grouped _default_ _case_ labels;
- describe primitive types for _case_ labels (JLS, §14.11,
§3.10.1);
- recognise some non-ASCII identifiers (see javaLambdaDef,
javaUserLabel) (further improvement for better recognition
of identifiers will be arranged in a separate PR).
Because the arrow '->' is used in two kinds of expressions,
lambda (abstractions) and _switch_, necessary changes were
made for the recognition of either (and further improvement
touching lambda expressions will be separately arranged).
Because 'default' is used for instance method declarations
in interfaces and in _switch_ labels, necessary changes were
made for the recognition of either (and further improvement
touching method declarations will be separately arranged).
Finally, it deemed appropriate to put 'yield' in the syntax
group of javaOperator rather than javaStatement, for its
member 'var' is also another contextual keyword (e.g., this
is valid syntax: "var var = var(test.var);").
References:
https://openjdk.org/jeps/361 (Switch Expressions)
https://openjdk.org/jeps/440 (Record Patterns)
https://openjdk.org/jeps/441 (Pattern Matching for switch)
Also, add a Java specific filetype plugin for the syntax
test, so that no soft-wrapping of long indented lines occur.
Otherwise the syntax scripts would miss a few lines during
scrolling and verification of the screen dumps.
closes: #14105
Signed-off-by: Aliaksei Budavei <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>
diff --git a/runtime/syntax/java.vim b/runtime/syntax/java.vim
index 44fbfa839..1b940ebd3 100644
--- a/runtime/syntax/java.vim
+++ b/runtime/syntax/java.vim
@@ -2,7 +2,7 @@
" Language: Java
" Maintainer: Claudio Fleiner <[email protected]>
" URL:
https://github.com/fleiner/vim/blob/master/runtime/syntax/java.vim
-" Last Change: 2023 Aug 13
+" Last Change: 2024 Feb 27
" Please check :help java.vim for comments on some of the options available.
@@ -37,9 +37,17 @@ syn keyword javaBoolean true false
syn keyword javaConstant null
syn keyword javaTypedef this super
syn keyword javaOperator var new instanceof
+" Since the yield statement, which could take a parenthesised operand,
+" and _qualified_ yield methods get along within the switch block
+" (JLS-17, §3.8), it seems futile to make a region definition for this
+" block; instead look for the _yield_ word alone, and if found,
+" backtrack (arbitrarily) 80 bytes, at most, on the matched line and,
+" if necessary, on the line before that (h: \@<=), trying to match
+" neither a method reference nor a qualified method invocation.
+syn match javaOperator "\%(\%(::\|\.\)[[:space:]
]*\)\@80<!\<yield\>"
syn keyword javaType boolean char byte short int long float double
syn keyword javaType void
-syn keyword javaStatement return yield
+syn keyword javaStatement return
syn keyword javaStorageClass static synchronized transient volatile final
strictfp serializable
syn keyword javaExceptions throw try catch finally
syn keyword javaAssert assert
@@ -56,6 +64,7 @@ syn keyword javaBranch break continue
nextgroup=javaUserLabelRef skipwhite
syn match javaUserLabelRef "\k\+" contained
syn match javaVarArg "\.\.\."
syn keyword javaScopeDecl public protected private abstract
+syn match javaConceptKind "\<default\>\%(\s*\%(:\|->\)\)\@!"
function s:isModuleInfoDeclarationCurrentBuffer() abort
return fnamemodify(bufname("%"), ":t") =~ '^module-info\%(\.class\>\)\@!'
@@ -142,15 +151,30 @@ if exists("java_space_errors")
endif
endif
-syn region javaLabelRegion transparent matchgroup=javaLabel
start="\<case\>" matchgroup=NONE end=":\|->"
contains=javaNumber,javaCharacter,javaString
-syn match javaUserLabel "^\s*[_$a-zA-Z][_$a-zA-Z0-9_]*\s*:"he=e-1
contains=javaLabel
-syn keyword javaLabel default
+syn match javaUserLabel "^\s*\<\K\k*\>\%(\<default\>\)\@<!\s*:"he=e-1
+syn region javaLabelRegion transparent matchgroup=javaLabel
start="\<case\>" matchgroup=NONE end=":\|->"
contains=javaLabelCastType,javaLabelNumber,javaCharacter,javaString,javaConstant,@javaClasses,javaLabelDefault,javaLabelVarType,javaLabelWhenClause
+syn region javaLabelRegion transparent matchgroup=javaLabel
start="\<default\>\%(\s*\%(:\|->\)\)\@=" matchgroup=NONE end=":\|->" oneline
+" Consider grouped _default_ _case_ labels, i.e.
+" case null, default ->
+" case null: default:
+syn keyword javaLabelDefault contained default
+syn keyword javaLabelVarType contained var
+syn keyword javaLabelCastType contained char byte short int
+" Allow for the contingency of the enclosing region not being able to
+" _keep_ its _end_, e.g. case ':':.
+syn region javaLabelWhenClause contained transparent
matchgroup=javaLabel start="\<when\>" matchgroup=NONE end=":"me=e-1
end="->"me=e-2 contains=TOP,javaExternal
+syn match javaLabelNumber contained "\<0\>[lL]\@!"
+syn match javaLabelNumber contained
"\<\%(0\%([xX]\x\%(_*\x\)*\|_*\o\%(_*\o\)*\|[bB][01]\%(_*[01]\)*\)\|[1-9]\%(_*\d\)*\)\>[lL]\@!"
+hi def link javaLabelDefault javaLabel
+hi def link javaLabelVarType javaOperator
+hi def link javaLabelNumber javaNumber
+hi def link javaLabelCastType javaType
" highlighting C++ keywords as errors removed, too many people find it
" annoying. Was: if !exists("java_allow_cpp_keywords")
" The following cluster contains all java groups except the contained ones
-syn cluster javaTop
add=javaExternal,javaError,javaBranch,javaLabelRegion,javaLabel,javaConditional,javaRepeat,javaBoolean,javaConstant,javaTypedef,javaOperator,javaType,javaStatement,javaStorageClass,javaAssert,javaExceptions,javaMethodDecl,javaClassDecl,javaScopeDecl,javaError2,javaUserLabel,javaLangObject,javaAnnotation,javaVarArg
+syn cluster javaTop
add=javaExternal,javaError,javaBranch,javaLabelRegion,javaConditional,javaRepeat,javaBoolean,javaConstant,javaTypedef,javaOperator,javaType,javaStatement,javaStorageClass,javaAssert,javaExceptions,javaMethodDecl,javaClassDecl,javaScopeDecl,javaConceptKind,javaError2,javaUserLabel,javaLangObject,javaAnnotation,javaVarArg
" Comments
@@ -231,9 +255,9 @@ if exists("java_highlight_functions")
" 1. class names are always capitalized (ie: Button)
" 2. method names are never capitalized (except constructors, of course)
"syn region javaFuncDef
start=+^\s\+\(\(public\|protected\|private\|static\|abstract\|final\|native\|synchronized\)\s\+\)*\(\(void\|boolean\|char\|byte\|short\|int\|long\|float\|double\|\([A-Za-z_][A-Za-z0-9_$]*\.\)*[A-Z][A-Za-z0-9_$]*\)\(<[^>]*>\)\=\(\[\]\)*\s\+[a-z][A-Za-z0-9_$]*\|[A-Z][A-Za-z0-9_$]*\)\s*([^0-9]+
end=+)+
contains=javaScopeDecl,javaType,javaStorageClass,javaComment,javaLineComment,@javaClasses
- syn region javaFuncDef
start=+^\s\+\(\(public\|protected\|private\|static\|abstract\|final\|native\|synchronized\)\s\+\)*\(<.*>\s\+\)\?\(\(void\|boolean\|char\|byte\|short\|int\|long\|float\|double\|\([A-Za-z_][A-Za-z0-9_$]*\.\)*[A-Z][A-Za-z0-9_$]*\)\(<[^(){}]*>\)\=\(\[\]\)*\s\+[a-z][A-Za-z0-9_$]*\|[A-Z][A-Za-z0-9_$]*\)\s*(+
end=+)+
contains=javaScopeDecl,javaType,javaStorageClass,javaComment,javaLineComment,@javaClasses,javaAnnotation
+ syn region javaFuncDef
start=+^\s\+\%(\%(public\|protected\|private\|static\|\%(abstract\|default\)\|final\|native\|synchronized\)\s\+\)*\%(<.*>\s\+\)\?\%(\%(void\|boolean\|char\|byte\|short\|int\|long\|float\|double\|\%([A-Za-z_][A-Za-z0-9_$]*\.\)*[A-Z][A-Za-z0-9_$]*\)\%(<[^(){}]*>\)\=\%(\[\]\)*\s\+[a-z][A-Za-z0-9_$]*\|[A-Z][A-Za-z0-9_$]*\)\s*(+
end=+)+
contains=javaScopeDecl,javaType,javaStorageClass,javaComment,javaLineComment,@javaClasses,javaAnnotation
endif
- syn match javaLambdaDef "[a-zA-Z_][a-zA-Z0-9_]*\s*->"
+ syn match javaLambdaDef "\<\K\k*\>\%(\<default\>\)\@<!\s*->"
syn match javaBraces "[{}]"
syn cluster javaTop add=javaFuncDef,javaBraces,javaLambdaDef
endif
@@ -326,6 +350,7 @@ hi def link javaStorageClass StorageClass
hi def link javaMethodDecl javaStorageClass
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
diff --git a/runtime/syntax/testdir/dumps/java_switch_00.dump
b/runtime/syntax/testdir/dumps/java_switch_00.dump
new file mode 100644
index 000000000..95e01426b
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/java_switch_00.dump
@@ -0,0 +1,20 @@
+>c+0#00e0003#ffffff0|l|a|s@1| +0#0000000&|S|w|i|t|c|h|T|e|s|t|s|
@2|/+0#0000e05&@1| |J|D|K| |2|1|+|.| +0#0000000&@43
+|{| @73
+@4|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d|
+0#0000000&|e|c|h|o|(|O|b|j|e|c|t| |o|)| |{|
|S|y|s|t|e|m|.|o|u|t|.|p|r|i|n|t|l|n|(|o|)|;| |}| @17
+@75
+@4|s+0#00e0003&|t|a|t|i|c| +0#0000000&|{| @62
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|d|e|f|a|u|l|t|_|(|)| |{| |r+0#af5f00255&|e|t|u|r|n|
+0#0000000&|t+0#00e0003&|h|i|s|;+0#0000000&| |}| @14
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|w|h|e|n|(|)| |{| |r+0#af5f00255&|e|t|u|r|n|
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|b|e|t|w|e@1|n| |"|:@1|"| |a|n|d| |"|y|i|e|l|d|;|"|.| +0#0000000&@9
+@8|Y|i|e|l|d|a|b|l|e|<|?|>| |y| |=| |(@1|Y|i|e|l|d|a|b|l|e|<|?|>|)| |(|)|
|-|>| |0+0#e000002&|)+0#0000000&|:@1| @23
+@75
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@15
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+@8|e+0#00e0003&|n|u|m| +0#0000000&|L|e|t@1|e|r|s| |{| |O|T|H|E|R|,|
|A|L|P|H|A|,| |B|E|T|A| |}| @31
+@57|1|,|1| @10|T|o|p|
diff --git a/runtime/syntax/testdir/dumps/java_switch_01.dump
b/runtime/syntax/testdir/dumps/java_switch_01.dump
new file mode 100644
index 000000000..0a76a87ff
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/java_switch_01.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@74
+@4|y|i|e|l|d|;| @64
+@8|(@1|Y|i|e|l|d|a|b|l|e|<|?|>|)| |(|)| |-|>|
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@15
+@75
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|A|L|P|H|A|,| |B|E|T|A| |}| @31
+> @74
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|e|c|h|o|(|L|e|t@1|e|r|s|.|A|L|P|H|A|)|;| |b+0#af5f00255&|r|e|a|k|;+0#0000000&|
|}| @23
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|e|c|h|o|(|L|e|t@1|e|r|s|.|B|E|T|A|)|;| |b+0#af5f00255&|r|e|a|k|;+0#0000000&|
|}| @24
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|e|c|h|o|(|L|e|t@1|e|r|s|.|O|T|H|E|R|)|;| |}| @30
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diff --git a/runtime/syntax/testdir/dumps/java_switch_02.dump
b/runtime/syntax/testdir/dumps/java_switch_02.dump
new file mode 100644
index 000000000..cf213ed47
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/java_switch_02.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@7|}|)|;| @63
+@75
+@8|S|t|r|i|n|g| |y+0#af5f00255&|i|e|l|d| +0#0000000&|=|
|n+0#e000002&|u|l@1|;+0#0000000&| @46
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|c+0#af5f00255&|a|s|e| +0#0000000&|"+0#e000002&|B|"|:+0#0000000&| |{|
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diff --git a/runtime/syntax/testdir/dumps/java_switch_03.dump
b/runtime/syntax/testdir/dumps/java_switch_03.dump
new file mode 100644
index 000000000..7766af363
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/java_switch_03.dump
@@ -0,0 +1,20 @@
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|e|c|h|o|(|"+0#e000002&|n|u|l@1|"|)+0#0000000&|;|
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diff --git a/runtime/syntax/testdir/dumps/java_switch_04.dump
b/runtime/syntax/testdir/dumps/java_switch_04.dump
new file mode 100644
index 000000000..38dfe4096
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/java_switch_04.dump
@@ -0,0 +1,20 @@
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|e|c|h|o|(|'+0#e000002&|a|'|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @29
+@8|c+0#af5f00255&|a|s|e| +0#0000000&|'+0#e000002&|b|'|:+0#0000000&| @6|{|
|e|c|h|o|(|'+0#e000002&|b|'|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @29
+@8|d+0#af5f00255&|e|f|a|u|l|t|:+0#0000000&| @7|{|
|e|c|h|o|(|'+0#e000002&|\+0#e000e06&|u|0@3|'+0#e000002&|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @24
+@8|}|;| @64
+> @74
+@8|e|c|h|o|(|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|c|h|)| |{| @48
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|'+0#e000002&|a|'| +0#0000000&@3|-|>|
|'+0#e000002&|a|'|;+0#0000000&| @43
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|'+0#e000002&|b|'| +0#0000000&@3|-|>|
|'+0#e000002&|b|'|;+0#0000000&| @43
+@12|d+0#af5f00255&|e|f|a|u|l|t| +0#0000000&@4|-|>|
|'+0#e000002&|\+0#e000e06&|u|0@3|'+0#e000002&|;+0#0000000&| @38
+@8|}|)|;| @63
+@75
+@8|b+0#00e0003&|y|t|e| +0#0000000&|b| |=| |(|b+0#00e0003&|y|t|e|)+0#0000000&|
|2+0#e000002&|;+0#0000000&| @48
+@75
+@8|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|b|)| |{| @54
+@8|c+0#af5f00255&|a|s|e| +0#0000000&|(@1|b+0#00e0003&|y|t|e|)+0#0000000&|
|0+0#e000002&|)+0#0000000&|:| @3|{|
|e|c|h|o|(@1|b+0#00e0003&|y|t|e|)+0#0000000&| |0+0#e000002&|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @20
+@8|c+0#af5f00255&|a|s|e| +0#0000000&|(@1|b+0#00e0003&|y|t|e|)+0#0000000&|
|1+0#e000002&|)+0#0000000&|:| @3|{|
|e|c|h|o|(@1|b+0#00e0003&|y|t|e|)+0#0000000&| |1+0#e000002&|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @20
+@8|d+0#af5f00255&|e|f|a|u|l|t|:+0#0000000&| @7|{|
|e|c|h|o|(@1|b+0#00e0003&|y|t|e|)+0#0000000&| |-|1+0#e000002&|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @23
+@8|}|;| @64
+@57|7|3|,|0|-|1| @7|6|5|%|
diff --git a/runtime/syntax/testdir/dumps/java_switch_05.dump
b/runtime/syntax/testdir/dumps/java_switch_05.dump
new file mode 100644
index 000000000..3a256671b
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/java_switch_05.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@7|}|;| @64
+@75
+@8|e|c|h|o|(|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|b|)| |{| @49
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|(@1|b+0#00e0003&|y|t|e|)+0#0000000&|
|0+0#e000002&|)+0#0000000&| |-|>| |(|b+0#00e0003&|y|t|e|)+0#0000000&|
|0+0#e000002&|;+0#0000000&| @34
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|(@1|b+0#00e0003&|y|t|e|)+0#0000000&|
|1+0#e000002&|)+0#0000000&| |-|>| |(|b+0#00e0003&|y|t|e|)+0#0000000&|
|1+0#e000002&|;+0#0000000&| @34
+@12>d+0#af5f00255&|e|f|a|u|l|t| +0#0000000&@4|-|>|
|(|b+0#00e0003&|y|t|e|)+0#0000000&| |-|1+0#e000002&|;+0#0000000&| @37
+@8|}|)|;| @63
+@75
+@8|s+0#00e0003&|h|o|r|t| +0#0000000&|s|h| |=|
|(|s+0#00e0003&|h|o|r|t|)+0#0000000&| |2+0#e000002&|;+0#0000000&| @45
+@75
+@8|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|s|h|)| |{| @53
+@8|c+0#af5f00255&|a|s|e| +0#0000000&|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&|
|0+0#e000002&|)+0#0000000&|:| @2|{|
|e|c|h|o|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&| |0+0#e000002&|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @19
+@8|c+0#af5f00255&|a|s|e| +0#0000000&|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&|
|1+0#e000002&|)+0#0000000&|:| @2|{|
|e|c|h|o|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&| |1+0#e000002&|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @19
+@8|d+0#af5f00255&|e|f|a|u|l|t|:+0#0000000&| @7|{|
|e|c|h|o|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&| |-|1+0#e000002&|)+0#0000000&|;|
|b+0#af5f00255&|r|e|a|k|;+0#0000000&| |}| @22
+@8|}|;| @64
+@75
+@8|e|c|h|o|(|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|s|h|)| |{| @48
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&|
|0+0#e000002&|)+0#0000000&| @3|-|>| |(|s+0#00e0003&|h|o|r|t|)+0#0000000&|
|0+0#e000002&|;+0#0000000&| @29
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&|
|1+0#e000002&|)+0#0000000&| @3|-|>| |(|s+0#00e0003&|h|o|r|t|)+0#0000000&|
|1+0#e000002&|;+0#0000000&| @29
+@57|9|1|,|4|-|1|3| @6|8|2|%|
diff --git a/runtime/syntax/testdir/dumps/java_switch_06.dump
b/runtime/syntax/testdir/dumps/java_switch_06.dump
new file mode 100644
index 000000000..9e72cc7bb
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/java_switch_06.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@11|c+0#af5f00255&|a|s|e|
+0#0000000&|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&| |1+0#e000002&|)+0#0000000&|
@3|-|>| |(|s+0#00e0003&|h|o|r|t|)+0#0000000&| |1+0#e000002&|;+0#0000000&| @29
+@12|d+0#af5f00255&|e|f|a|u|l|t| +0#0000000&@8|-|>|
|(|s+0#00e0003&|h|o|r|t|)+0#0000000&| |-|1+0#e000002&|;+0#0000000&| @32
+@8|}|)|;| @63
+@75
+@8|i+0#00e0003&|n|t| +0#0000000&|i| |=| |2+0#e000002&|;+0#0000000&| @56
+> @74
+@8|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|i|)| |{| @54
+@8|c+0#af5f00255&|a|s|e|
+0#0000000&|0+0#e000002&|b|0|_@1|0@1|_@2|0@2|:+0#0000000&| |{|
|e|c|h|o|(|0+0#e000002&|)+0#0000000&|;| |b+0#af5f00255&|r|e|a|k|;+0#0000000&|
|}| @27
+@8|c+0#af5f00255&|a|s|e|
+0#0000000&|0+0#e000002&|x|0@2|_@2|0@1|_@1|1|:+0#0000000&| |{|
|e|c|h|o|(|1+0#e000002&|)+0#0000000&|;| |b+0#af5f00255&|r|e|a|k|;+0#0000000&|
|}| @27
+@8|d+0#af5f00255&|e|f|a|u|l|t|:+0#0000000&| @7|{|
|e|c|h|o|(|-|1+0#e000002&|)+0#0000000&|;| |b+0#af5f00255&|r|e|a|k|;+0#0000000&|
|}| @30
+@8|}|;| @64
+@75
+@8|e|c|h|o|(|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|i|)| |{| @49
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|0+0#e000002&|_|0|_|0|_|0|_|0|
+0#0000000&@1|-|>| |0+0#e000002&|;+0#0000000&| @41
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|1+0#e000002&| +0#0000000&@5|-|>|
|1+0#e000002&|;+0#0000000&| @45
+@12|d+0#af5f00255&|e|f|a|u|l|t| +0#0000000&@4|-|>|
|-|1+0#e000002&|;+0#0000000&| @44
+@8|}|)|;| @63
+@4|}| @69
+|}| @73
+@57|1|0|9|,|0|-|1| @6|B|o|t|
diff --git a/runtime/syntax/testdir/dumps/java_switch_99.dump
b/runtime/syntax/testdir/dumps/java_switch_99.dump
new file mode 100644
index 000000000..f275382a3
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/java_switch_99.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@11|c+0#af5f00255&|a|s|e|
+0#0000000&|(@1|s+0#00e0003&|h|o|r|t|)+0#0000000&| |1+0#e000002&|)+0#0000000&|
@3|-|>| |(|s+0#00e0003&|h|o|r|t|)+0#0000000&| |1+0#e000002&|;+0#0000000&| @29
+@12|d+0#af5f00255&|e|f|a|u|l|t| +0#0000000&@8|-|>|
|(|s+0#00e0003&|h|o|r|t|)+0#0000000&| |-|1+0#e000002&|;+0#0000000&| @32
+@8|}|)|;| @63
+@75
+@8|i+0#00e0003&|n|t| +0#0000000&|i| |=| |2+0#e000002&|;+0#0000000&| @56
+@75
+@8|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|i|)| |{| @54
+@8|c+0#af5f00255&|a|s|e|
+0#0000000&|0+0#e000002&|b|0|_@1|0@1|_@2|0@2|:+0#0000000&| |{|
|e|c|h|o|(|0+0#e000002&|)+0#0000000&|;| |b+0#af5f00255&|r|e|a|k|;+0#0000000&|
|}| @27
+@8|c+0#af5f00255&|a|s|e|
+0#0000000&|0+0#e000002&|x|0@2|_@2|0@1|_@1|1|:+0#0000000&| |{|
|e|c|h|o|(|1+0#e000002&|)+0#0000000&|;| |b+0#af5f00255&|r|e|a|k|;+0#0000000&|
|}| @27
+@8|d+0#af5f00255&|e|f|a|u|l|t|:+0#0000000&| @7|{|
|e|c|h|o|(|-|1+0#e000002&|)+0#0000000&|;| |b+0#af5f00255&|r|e|a|k|;+0#0000000&|
|}| @30
+@8|}|;| @64
+@75
+@8|e|c|h|o|(|s+0#af5f00255&|w|i|t|c|h| +0#0000000&|(|i|)| |{| @49
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|0+0#e000002&|_|0|_|0|_|0|_|0|
+0#0000000&@1|-|>| |0+0#e000002&|;+0#0000000&| @41
+@12|c+0#af5f00255&|a|s|e| +0#0000000&|1+0#e000002&| +0#0000000&@5|-|>|
|1+0#e000002&|;+0#0000000&| @45
+@12|d+0#af5f00255&|e|f|a|u|l|t| +0#0000000&@4|-|>|
|-|1+0#e000002&|;+0#0000000&| @44
+@8|}|)|;| @63
+@4|}| @69
+>}| @73
+@57|1|2@1|,|1| @8|B|o|t|
diff --git a/runtime/syntax/testdir/ftplugin/java.vim
b/runtime/syntax/testdir/ftplugin/java.vim
new file mode 100644
index 000000000..da198e18e
--- /dev/null
+++ b/runtime/syntax/testdir/ftplugin/java.vim
@@ -0,0 +1,5 @@
+" The Java source file uses long lines with tabs
+" so use a smaller tabstop value, so that no
+" soft-wrapping occurs (which may cause the syntax
+" tests to miss some lines during scrolling)
+setl ts=4
diff --git a/runtime/syntax/testdir/input/java_switch.java
b/runtime/syntax/testdir/input/java_switch.java
new file mode 100644
index 000000000..14b2e1149
--- /dev/null
+++ b/runtime/syntax/testdir/input/java_switch.java
@@ -0,0 +1,122 @@
+class SwitchTests // JDK 21+.
+{
+ static void echo(Object o) { System.out.println(o); }
+
+ static {
+ interface Yieldable<T>
+ {
+ T yield();
+ default Yieldable<T> default_() { return this; }
+ default Yieldable<T> when() { return this; }
+ }
+
+ // There are 80 bytes (\@80<!) between "::" and "yield;".
+ Yieldable<?> y = ((Yieldable<?>) () -> 0)::
+
yield;
+ ((Yieldable<?>) () -> 0).when().default_().yield();
+
+ enum Letters { OTHER, ALPHA, BETA }
+
+ Letters when = Letters.OTHER;
+
+ switch (when) {
+ case ALPHA: { echo(Letters.ALPHA); break; }
+ case BETA: { echo(Letters.BETA); break; }
+ default: { echo(Letters.OTHER); }
+ }
+
+ echo(switch (when) {
+ case ALPHA -> Letters.ALPHA;
+ case BETA -> Letters.BETA;
+ default -> { yield(Letters.OTHER); }
+ });
+
+ String yield = null;
+
+ switch (yield) {
+ case "A": case "B": { echo("A or B"); break; }
+ case ":": { echo("Colon"); break; }
+ case String str when !str.equals(""):
+ { echo("<non-empty>"); break; }
+ case null: default: { echo("Other"); }
+ }
+
+ echo(switch (yield) {
+ case "A", "B" -> { yield("A or B"); }
+ case "->" -> "Arrow";
+ case String str when !str.equals("")
+ -> "<non-empty>";
+ case null, default -> "Other";
+ });
+
+ Object o = new Object();
+
+ switch (o) {
+ case null: { echo("null"); break; }
+ case Letters[] ll: { echo("SwitchTests$1Letters[]");
break; }
+ default: { echo("java.lang.Object"); break; }
+ };
+
+ echo(switch (o) {
+ case null -> "null";
+ case Letters[] ll -> "SwitchTests$1Letters[]";
+ default -> "java.lang.Object";
+ });
+
+ char ch = 'c';
+
+ switch (ch) {
+ case 'a': { echo('a'); break; }
+ case 'b': { echo('b'); break; }
+ default: { echo('\u0000'); break; }
+ };
+
+ echo(switch (ch) {
+ case 'a' -> 'a';
+ case 'b' -> 'b';
+ default -> '\u0000';
+ });
+
+ byte b = (byte) 2;
+
+ switch (b) {
+ case ((byte) 0): { echo((byte) 0); break; }
+ case ((byte) 1): { echo((byte) 1); break; }
+ default: { echo((byte) -1); break; }
+ };
+
+ echo(switch (b) {
+ case ((byte) 0) -> (byte) 0;
+ case ((byte) 1) -> (byte) 1;
+ default -> (byte) -1;
+ });
+
+ short sh = (short) 2;
+
+ switch (sh) {
+ case ((short) 0): { echo((short) 0); break; }
+ case ((short) 1): { echo((short) 1); break; }
+ default: { echo((short) -1); break; }
+ };
+
+ echo(switch (sh) {
+ case ((short) 0) -> (short) 0;
+ case ((short) 1) -> (short) 1;
+ default -> (short) -1;
+ });
+
+ int i = 2;
+
+ switch (i) {
+ case 0b0__00___000: { echo(0); break; }
+ case 0x000___00__1: { echo(1); break; }
+ default: { echo(-1); break; }
+ };
+
+ echo(switch (i) {
+ case 0_0_0_0_0 -> 0;
+ case 1 -> 1;
+ default -> -1;
+ });
+ }
+}
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