FILE: C:\Program Files\Git\usr\share\vim\vim91\syntax\rust.vim

--
" Vim syntax file
" Language:     Rust
" Maintainer:   Patrick Walton 
" Maintainer:   Ben Blum 
" Maintainer:   Chris Morgan 
" Last Change:  2023-09-11
" For bugs, patches and license go to https://github.com/rust-lang/rust.vim

if version < 600
    syntax clear
elseif exists("b:current_syntax")
    finish
endif

" Syntax definitions {{{1
" Basic keywords {{{2
syn keyword   rustConditional match if else
syn keyword   rustRepeat loop while
" `:syn match` must be used to prioritize highlighting `for` keyword.
syn match     rustRepeat /\/
" Highlight `for` keyword in `impl ... for ... {}` statement. This line must
" be put after previous `syn match` line to overwrite it.
syn match     rustKeyword /\%(\.\+\)\@<=\/
syn keyword   rustRepeat in
syn keyword   rustTypedef type nextgroup=rustIdentifier skipwhite skipempty
syn keyword   rustStructure struct enum nextgroup=rustIdentifier skipwhite skipempty
syn keyword   rustUnion union nextgroup=rustIdentifier skipwhite skipempty contained
syn match rustUnionContextual /\/
syn keyword   rustAwait       await
syn match     rustKeyword     /\!\@!/ display

syn keyword rustPubScopeCrate crate contained
syn match rustPubScopeDelim /[()]/ contained
syn match rustPubScope /([^()]*)/ contained contains=rustPubScopeDelim,rustPubScopeCrate,rustSuper,rustModPath,rustModPathSep,rustSelf transparent

syn keyword   rustExternCrate crate contained nextgroup=rustIdentifier,rustExternCrateString skipwhite skipempty
" This is to get the `bar` part of `extern crate "foo" as bar;` highlighting.
syn match   rustExternCrateString /".*"\_s*as/ contained nextgroup=rustIdentifier skipwhite transparent skipempty contains=rustString,rustOperator
syn keyword   rustObsoleteExternMod mod contained nextgroup=rustIdentifier skipwhite skipempty

syn match     rustIdentifier  contains=rustIdentifierPrime "\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*" display contained
syn match     rustFuncName    "\%(r#\)\=\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*" display contained

syn region rustMacroRepeat matchgroup=rustMacroRepeatDelimiters start="$(" end="),\=[*+]" contains=TOP
syn match rustMacroVariable "$\w\+"
syn match rustRawIdent "\();

" This is merely a convention; note also the use of [A-Z], restricting it to
" latin identifiers rather than the full Unicode uppercase. I have not used
" [:upper:] as it depends upon 'noignorecase'
"syn match     rustCapsIdent    display "[A-Z]\w\(\w\)*"

syn match     rustOperator     display "\%(+\|-\|/\|*\|=\|\^\|&\||\|!\|>\|<\|%\)=\?"
" This one isn't *quite* right, as we could have binary-& with a reference
syn match     rustSigil        display /&\s\+[&~@*][^)= \t\r\n]/he=e-1,me=e-1
syn match     rustSigil        display /[&~@*][^)= \t\r\n]/he=e-1,me=e-1
" This isn't actually correct; a closure with no arguments can be `|| { }`.
" Last, because the & in && isn't a sigil
syn match     rustOperator     display "&&\|||"
" This is rustArrowCharacter rather than rustArrow for the sake of matchparen,
" so it skips the ->; see http://stackoverflow.com/a/30309949 for details.
syn match     rustArrowCharacter display "->"
syn match     rustQuestionMark display "?\([a-zA-Z]\+\)\@!"

syn match     rustMacro       '\w\(\w\)*!' contains=rustAssert,rustPanic
syn match     rustMacro       '#\w\(\w\)*' contains=rustAssert,rustPanic

syn match     rustEscapeError   display contained /\\./
syn match     rustEscape        display contained /\\\([nrt0\\'"]\|x\x\{2}\)/
syn match     rustEscapeUnicode display contained /\\u{\%(\x_*\)\{1,6}}/
syn match     rustStringContinuation display contained /\\\n\s*/
syn region    rustString      matchgroup=rustStringDelimiter start=+b"+ skip=+\\\\\|\\"+ end=+"+ contains=rustEscape,rustEscapeError,rustStringContinuation
syn region    rustString      matchgroup=rustStringDelimiter start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=rustEscape,rustEscapeUnicode,rustEscapeError,rustStringContinuation,@Spell
syn region    rustString      matchgroup=rustStringDelimiter start='b\?r\z(#*\)"' end='"\z1' contains=@Spell

" Match attributes with either arbitrary syntax or special highlighting for
" derives. We still highlight strings and comments inside of the attribute.
syn region    rustAttribute   start="#!\?\[" end="\]" contains=@rustAttributeContents,rustAttributeParenthesizedParens,rustAttributeParenthesizedCurly,rustAttributeParenthesizedBrackets,rustDerive
syn region    rustAttributeParenthesizedParens matchgroup=rustAttribute start="\w\%(\w\)*("rs=e end=")"re=s transparent contained contains=rustAttributeBalancedParens,@rustAttributeContents
syn region    rustAttributeParenthesizedCurly matchgroup=rustAttribute start="\w\%(\w\)*{"rs=e end="}"re=s transparent contained contains=rustAttributeBalancedCurly,@rustAttributeContents
syn region    rustAttributeParenthesizedBrackets matchgroup=rustAttribute start="\w\%(\w\)*\["rs=e end="\]"re=s transparent contained contains=rustAttributeBalancedBrackets,@rustAttributeContents
syn region    rustAttributeBalancedParens matchgroup=rustAttribute start="("rs=e end=")"re=s transparent contained contains=rustAttributeBalancedParens,@rustAttributeContents
syn region    rustAttributeBalancedCurly matchgroup=rustAttribute start="{"rs=e end="}"re=s transparent contained contains=rustAttributeBalancedCurly,@rustAttributeContents
syn region    rustAttributeBalancedBrackets matchgroup=rustAttribute start="\["rs=e end="\]"re=s transparent contained contains=rustAttributeBalancedBrackets,@rustAttributeContents
syn cluster   rustAttributeContents contains=rustString,rustCommentLine,rustCommentBlock,rustCommentLineDocError,rustCommentBlockDocError
syn region    rustDerive      start="derive(" end=")" contained contains=rustDeriveTrait
" This list comes from src/libsyntax/ext/deriving/mod.rs
" Some are deprecated (Encodable, Decodable) or to be removed after a new snapshot (Show).
syn keyword   rustDeriveTrait contained Clone Hash RustcEncodable RustcDecodable Encodable Decodable PartialEq Eq PartialOrd Ord Rand Show Debug Default FromPrimitive Send Sync Copy

" dyn keyword: It's only a keyword when used inside a type expression, so
" we make effort here to highlight it only when Rust identifiers follow it
" (not minding the case of pre-2018 Rust where a path starting with :: can
" follow).
"
" This is so that uses of dyn variable names such as in 'let &dyn = &2'
" and 'let dyn = 2' will not get highlighted as a keyword.
syn match     rustKeyword "\/ contains=rustGenericLifetimeCandidate
syn region rustGenericLifetimeCandidate display start=/\%(<\|,\s*\)\@<='/ end=/[[:cntrl:][:space:][:punct:]]\@=\|$/ contains=rustSigil,rustLifetime

"rustLifetime must appear before rustCharacter, or chars will get the lifetime highlighting
syn match     rustLifetime    display "\'\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*"
syn match     rustLabel       display "\'\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*:"
syn match     rustLabel       display "\%(\<\%(break\|continue\)\s*\)\@<=\'\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*"
syn match   rustCharacterInvalid   display contained /b\?'\zs[\n\r\t']\ze'/
" The groups negated here add up to 0-255 but nothing else (they do not seem to go beyond ASCII).
syn match   rustCharacterInvalidUnicode   display contained /b'\zs[^[:cntrl:][:graph:][:alnum:][:space:]]\ze'/
syn match   rustCharacter   /b'\([^\\]\|\\\(.\|x\x\{2}\)\)'/ contains=rustEscape,rustEscapeError,rustCharacterInvalid,rustCharacterInvalidUnicode
syn match   rustCharacter   /'\([^\\]\|\\\(.\|x\x\{2}\|u{\%(\x_*\)\{1,6}}\)\)'/ contains=rustEscape,rustEscapeUnicode,rustEscapeError,rustCharacterInvalid

syn match rustShebang /\%^#![^[].*/
syn region rustCommentLine                                                  start="//"                      end="$"   contains=rustTodo,@Spell
syn region rustCommentLineDoc                                               start="//\%(//\@!\|!\)"         end="$"   contains=rustTodo,@Spell
syn region rustCommentLineDocError                                          start="//\%(//\@!\|!\)"         end="$"   contains=rustTodo,@Spell contained
syn region rustCommentBlock             matchgroup=rustCommentBlock         start="/\*\%(!\|\*[*/]\@!\)\@!" end="\*/" contains=rustTodo,rustCommentBlockNest,@Spell
syn region rustCommentBlockDoc          matchgroup=rustCommentBlockDoc      start="/\*\%(!\|\*[*/]\@!\)"    end="\*/" contains=rustTodo,rustCommentBlockDocNest,rustCommentBlockDocRustCode,@Spell
syn region rustCommentBlockDocError     matchgroup=rustCommentBlockDocError start="/\*\%(!\|\*[*/]\@!\)"    end="\*/" contains=rustTodo,rustCommentBlockDocNestError,@Spell contained
syn region rustCommentBlockNest         matchgroup=rustCommentBlock         start="/\*"                     end="\*/" contains=rustTodo,rustCommentBlockNest,@Spell contained transparent
syn region rustCommentBlockDocNest      matchgroup=rustCommentBlockDoc      start="/\*"                     end="\*/" contains=rustTodo,rustCommentBlockDocNest,@Spell contained transparent
syn region rustCommentBlockDocNestError matchgroup=rustCommentBlockDocError start="/\*"                     end="\*/" contains=rustTodo,rustCommentBlockDocNestError,@Spell contained transparent

" FIXME: this is a really ugly and not fully correct implementation. Most
" importantly, a case like ``/* */*`` should have the final ``*`` not being in
" a comment, but in practice at present it leaves comments open two levels
" deep. But as long as you stay away from that particular case, I *believe*
" the highlighting is correct. Due to the way Vim's syntax engine works
" (greedy for start matches, unlike Rust's tokeniser which is searching for
" the earliest-starting match, start or end), I believe this cannot be solved.
" Oh you who would fix it, don't bother with things like duplicating the Block
" rules and putting ``\*\@:p:h/rust.vim
    unlet b:current_syntax_embed

    " Currently regions marked as ``` will not get
    " highlighted at all. In the future, we can do as vim-markdown does and
    " highlight with the other syntax. But for now, let's make sure we find
    " the closing block marker, because the rules below won't catch it.
    syn region rustCommentLinesDocNonRustCode matchgroup=rustCommentDocCodeFence start='^\z(\s*//[!/]\s*```\).\+$' end='^\z1$' keepend contains=rustCommentLineDoc

    " We borrow the rules from rust’s src/librustdoc/html/markdown.rs, so that
    " we only highlight as Rust what it would perceive as Rust (almost; it’s
    " possible to trick it if you try hard, and indented code blocks aren’t
    " supported because Markdown is a menace to parse and only mad dogs and
    " Englishmen would try to handle that case correctly in this syntax file).
    syn region rustCommentLinesDocRustCode matchgroup=rustCommentDocCodeFence start='^\z(\s*//[!/]\s*```\)[^A-Za-z0-9_-]*\%(\%(should_panic\|no_run\|ignore\|allow_fail\|rust\|test_harness\|compile_fail\|E\d\{4}\|edition201[58]\)\%([^A-Za-z0-9_-]\+\|$\)\)*$' end='^\z1$' keepend contains=@RustCodeInComment,rustCommentLineDocLeader
    syn region rustCommentBlockDocRustCode matchgroup=rustCommentDocCodeFence start='^\z(\%(\s*\*\)\?\s*```\)[^A-Za-z0-9_-]*\%(\%(should_panic\|no_run\|ignore\|allow_fail\|rust\|test_harness\|compile_fail\|E\d\{4}\|edition201[58]\)\%([^A-Za-z0-9_-]\+\|$\)\)*$' end='^\z1$' keepend contains=@RustCodeInComment,rustCommentBlockDocStar
    " Strictly, this may or may not be correct; this code, for example, would
    " mishighlight:
    "
    "     /**
    "     ```rust
    "     println!("{}", 1
    "     * 1);
    "     ```
    "     */
    "
    " … but I don’t care. Balance of probability, and all that.
    syn match rustCommentBlockDocStar /^\s*\*\s\?/ contained
    syn match rustCommentLineDocLeader "^\s*//\%(//\@!\|!\)" contained
endif

" Default highlighting {{{1
hi def link rustDecNumber       rustNumber
hi def link rustHexNumber       rustNumber
hi def link rustOctNumber       rustNumber
hi def link rustBinNumber       rustNumber
hi def link rustIdentifierPrime rustIdentifier
hi def link rustTrait           rustType
hi def link rustDeriveTrait     rustTrait

hi def link rustMacroRepeatDelimiters   Macro
hi def link rustMacroVariable Define
hi def link rustSigil         StorageClass
hi def link rustEscape        Special
hi def link rustEscapeUnicode rustEscape
hi def link rustEscapeError   Error
hi def link rustStringContinuation Special
hi def link rustString        String
hi def link rustStringDelimiter String
hi def link rustCharacterInvalid Error
hi def link rustCharacterInvalidUnicode rustCharacterInvalid
hi def link rustCharacter     Character
hi def link rustNumber        Number
hi def link rustBoolean       Boolean
hi def link rustEnum          rustType
hi def link rustEnumVariant   rustConstant
hi def link rustConstant      Constant
hi def link rustSelf          Constant
hi def link rustFloat         Float
hi def link rustArrowCharacter rustOperator
hi def link rustOperator      Operator
hi def link rustKeyword       Keyword
hi def link rustDynKeyword    rustKeyword
hi def link rustTypedef       Keyword " More precise is Typedef, but it doesn't feel right for Rust
hi def link rustStructure     Keyword " More precise is Structure
hi def link rustUnion         rustStructure
hi def link rustExistential   rustKeyword
hi def link rustPubScopeDelim Delimiter
hi def link rustPubScopeCrate rustKeyword
hi def link rustSuper         rustKeyword
hi def link rustUnsafeKeyword Exception
hi def link rustReservedKeyword Error
hi def link rustRepeat        Conditional
hi def link rustConditional   Conditional
hi def link rustIdentifier    Identifier
hi def link rustCapsIdent     rustIdentifier
hi def link rustModPath       Include
hi def link rustModPathSep    Delimiter
hi def link rustFunction      Function
hi def link rustFuncName      Function
hi def link rustFuncCall      Function
hi def link rustShebang       Comment
hi def link rustCommentLine   Comment
hi def link rustCommentLineDoc SpecialComment
hi def link rustCommentLineDocLeader rustCommentLineDoc
hi def link rustCommentLineDocError Error
hi def link rustCommentBlock  rustCommentLine
hi def link rustCommentBlockDoc rustCommentLineDoc
hi def link rustCommentBlockDocStar rustCommentBlockDoc
hi def link rustCommentBlockDocError Error
hi def link rustCommentDocCodeFence rustCommentLineDoc
hi def link rustAssert        PreCondit
hi def link rustPanic         PreCondit
hi def link rustMacro         Macro
hi def link rustType          Type
hi def link rustTodo          Todo
hi def link rustAttribute     PreProc
hi def link rustDerive        PreProc
hi def link rustDefault       StorageClass
hi def link rustStorage       StorageClass
hi def link rustObsoleteStorage Error
hi def link rustLifetime      Special
hi def link rustLabel         Label
hi def link rustExternCrate   rustKeyword
hi def link rustObsoleteExternMod Error
hi def link rustQuestionMark  Special
hi def link rustAsync         rustKeyword
hi def link rustAwait         rustKeyword
hi def link rustAsmDirSpec    rustKeyword
hi def link rustAsmSym        rustKeyword
hi def link rustAsmOptions    rustKeyword
hi def link rustAsmOptionsKey rustAttribute

" Other Suggestions:
" hi rustAttribute ctermfg=cyan
" hi rustDerive ctermfg=cyan
" hi rustAssert ctermfg=yellow
" hi rustPanic ctermfg=red
" hi rustMacro ctermfg=magenta

syn sync minlines=200
syn sync maxlines=500

let b:current_syntax = "rust"

" vim: set et sw=4 sts=4 ts=8:

--