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" Vim syntax file
" Modification of vims Haskell syntax file:
" - match types using regular expression
" - highlight toplevel functions
" - use "syntax keyword" instead of "syntax match" where appropriate
" - functions and types in import and module declarations are matched
" - removed hs_highlight_more_types (just not needed anymore)
" - enable spell checking in comments and strings only
" - FFI highlighting
" - QuasiQuotation
" - top level Template Haskell slices
" - PackageImport
" TODO: find out which vim versions are still supported
" From Original file:
" ===================
" Language: Haskell
" Maintainer: Haskell Cafe mailinglist <>
" Last Change: 2010 Feb 21
" Original Author: John Williams <>
" Thanks to Ryan Crumley for suggestions and John Meacham for
" pointing out bugs. Also thanks to Ian Lynagh and Donald Bruce Stewart
" for providing the inspiration for the inclusion of the handling
" of C preprocessor directives, and for pointing out a bug in the
" end-of-line comment handling.
" Options-assign a value to these variables to turn the option on:
" hs_highlight_delimiters - Highlight delimiter characters--users
" with a light-colored background will
" probably want to turn this on.
" hs_highlight_boolean - Treat True and False as keywords.
" hs_highlight_types - Treat names of primitive types as keywords.
" hs_highlight_debug - Highlight names of debugging functions.
" hs_allow_hash_operator - Don't highlight seemingly incorrect C
" preprocessor directives but assume them to be
" operators
if version < 600
syn clear
elseif exists("b:current_syntax")
"syntax sync fromstart "mmhhhh.... is this really ok to do so?
syntax sync linebreaks=15 minlines=50 maxlines=500
syn match hsSpecialChar contained "\\\([0-9]\+\|o[0-7]\+\|x[0-9a-fA-F]\+\|[\"\\'&\\abfnrtv]\|^[A-Z^_\[\\\]]\)"
syn match hsSpecialChar contained "\\\(NUL\|SOH\|STX\|ETX\|EOT\|ENQ\|ACK\|BEL\|BS\|HT\|LF\|VT\|FF\|CR\|SO\|SI\|DLE\|DC1\|DC2\|DC3\|DC4\|NAK\|SYN\|ETB\|CAN\|EM\|SUB\|ESC\|FS\|GS\|RS\|US\|SP\|DEL\)"
syn match hsSpecialCharError contained "\\&\|'''\+"
sy region hsString start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=hsSpecialChar,@Spell
sy match hsCharacter "[^a-zA-Z0-9_']'\([^\\]\|\\[^']\+\|\\'\)'"lc=1 contains=hsSpecialChar,hsSpecialCharError
sy match hsCharacter "^'\([^\\]\|\\[^']\+\|\\'\)'" contains=hsSpecialChar,hsSpecialCharError
" (Qualified) identifiers (no default highlighting)
syn match ConId "\(\<[A-Z][a-zA-Z0-9_']*\.\)\=\<[A-Z][a-zA-Z0-9_']*\>"
syn match VarId "\(\<[A-Z][a-zA-Z0-9_']*\.\)\=\<[a-z][a-zA-Z0-9_']*\>"
" Infix operators--most punctuation characters and any (qualified) identifier
" enclosed in `backquotes`. An operator starting with : is a constructor,
" others are variables (e.g. functions).
syn match hsVarSym "\(\<[A-Z][a-zA-Z0-9_']*\.\)\=[-!#$%&\*\+/<=>\?@\\^|~.][-!#$%&\*\+/<=>\?@\\^|~:.]*"
syn match hsConSym "\(\<[A-Z][a-zA-Z0-9_']*\.\)\=:[-!#$%&\*\+./<=>\?@\\^|~:]*"
syn match hsVarSym "`\(\<[A-Z][a-zA-Z0-9_']*\.\)\=[a-z][a-zA-Z0-9_']*`"
syn match hsConSym "`\(\<[A-Z][a-zA-Z0-9_']*\.\)\=[A-Z][a-zA-Z0-9_']*`"
" Toplevel Template Haskell support
"sy match hsTHTopLevel "^[a-z]\(\(.\&[^=]\)\|\(\n[^a-zA-Z0-9]\)\)*"
sy match hsTHIDTopLevel "^[a-z]\S*"
sy match hsTHTopLevel "^\$(\?" nextgroup=hsTHTopLevelName
sy match hsTHTopLevelName "[a-z]\S*" contained
" Reserved symbols--cannot be overloaded.
syn match hsDelimiter "(\|)\|\[\|\]\|,\|;\|_\|{\|}"
sy region hsInnerParen start="(" end=")" contained contains=hsInnerParen,hsConSym,hsType,hsVarSym
sy region hs_InfixOpFunctionName start="^(" end=")\s*[^:`]\(\W\&\S\&[^'\"`()[\]{}@]\)\+"re=s
\ contained keepend contains=hsInnerParen,hs_HlInfixOp
sy match hs_hlFunctionName "[a-z_]\(\S\&[^,\(\)\[\]]\)*" contained
sy match hs_FunctionName "^[a-z_]\(\S\&[^,\(\)\[\]]\)*" contained contains=hs_hlFunctionName
sy match hs_HighliteInfixFunctionName "`[a-z_][^`]*`" contained
sy match hs_InfixFunctionName "^\S[^=]*`[a-z_][^`]*`"me=e-1 contained contains=hs_HighliteInfixFunctionName,hsType,hsConSym,hsVarSym,hsString,hsCharacter
sy match hs_HlInfixOp "\(\W\&\S\&[^`(){}'[\]]\)\+" contained contains=hsString
sy match hs_InfixOpFunctionName "^\(\(\w\|[[\]{}]\)\+\|\(\".*\"\)\|\('.*'\)\)\s*[^:]=*\(\W\&\S\&[^='\"`()[\]{}@]\)\+"
\ contained contains=hs_HlInfixOp,hsCharacter
sy match hs_OpFunctionName "(\(\W\&[^(),\"]\)\+)" contained
"sy region hs_Function start="^["'a-z_([{]" end="=\(\s\|\n\|\w\|[([]\)" keepend extend
sy region hs_Function start="^["'a-zA-Z_([{]\(\(.\&[^=]\)\|\(\n\s\)\)*=" end="\(\s\|\n\|\w\|[([]\)"
\ contains=hs_OpFunctionName,hs_InfixOpFunctionName,hs_InfixFunctionName,hs_FunctionName,hsType,hsConSym,hsVarSym,hsString,hsCharacter
sy match hs_DeclareFunction "^[a-z_(]\S*\(\s\|\n\)*::" contains=hs_FunctionName,hs_OpFunctionName
" hi hs_InfixOpFunctionName guibg=bg
" hi hs_Function guibg=green
" hi hs_InfixFunctionName guibg=red
" hi hs_DeclareFunction guibg=red
sy keyword hsStructure data family class where instance default deriving
sy keyword hsTypedef type newtype
sy keyword hsInfix infix infixl infixr
sy keyword hsStatement do case of let in
sy keyword hsConditional if then else
"if exists("hs_highlight_types")
" Primitive types from the standard prelude and libraries.
sy match hsType "\<[A-Z]\(\S\&[^,.]\)*\>"
sy match hsType "()"
" Not real keywords, but close.
if exists("hs_highlight_boolean")
" Boolean constants from the standard prelude.
syn keyword hsBoolean True False
syn region hsPackageString start=+L\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial contained
sy match hsModuleName excludenl "\([A-Z]\w*\.\?\)*" contained
sy match hsImport "\<import\>\s\+\(qualified\s\+\)\?\(\<\(\w\|\.\)*\>\)"
\ contains=hsModuleName,hsImportLabel
\ nextgroup=hsImportParams,hsImportIllegal skipwhite
sy keyword hsImportLabel import qualified contained
sy match hsImportIllegal "\w\+" contained
sy keyword hsAsLabel as contained
sy keyword hsHidingLabel hiding contained
sy match hsImportParams "as\s\+\(\w\+\)" contained
\ contains=hsModuleName,hsAsLabel
\ nextgroup=hsImportParams,hsImportIllegal skipwhite
sy match hsImportParams "hiding" contained
\ contains=hsHidingLabel
\ nextgroup=hsImportParams,hsImportIllegal skipwhite
sy match hsImportParams "\(\w\*\)" contained
\ contains=hsBlockComment,hsLineComment,hsType,hsDelimTypeExport,hs_hlFunctionName,hs_OpFunctionName
\ nextgroup=hsImportIllegal skipwhite
"hi hsImport guibg=red
"hi hsImportParams guibg=bg
"hi hsImportIllegal guibg=bg
"hi hsModuleName guibg=bg
"sy match hsImport "\<import\>\(.\|[^(]\)*\((.*)\)\?"
" \ contains=hsPackageString,hsImportLabel,hsImportMod,hsModuleName,hsImportList
"sy keyword hsImportLabel import contained
"sy keyword hsImportMod as qualified hiding contained
"sy region hsImportListInner start="(" end=")" contained keepend extend contains=hs_OpFunctionName
"sy region hsImportList matchgroup=hsImportListParens start="("rs=s+1 end=")"re=e-1
" \ contained
" \ keepend extend
" \ contains=hsType,hsLineComment,hsBlockComment,hs_hlFunctionName,hsImportListInner
" new module highlighting
syn region hsDelimTypeExport start="\<[A-Z]\(\S\&[^,.]\)*\>(" end=")" contained
\ contains=hsType
sy keyword hsExportModuleLabel module contained
sy match hsExportModule "\<module\>\(\s\|\t\|\n\)*\([A-Z]\w*\.\?\)*" contained contains=hsExportModuleLabel,hsModuleName
sy keyword hsModuleStartLabel module contained
sy keyword hsModuleWhereLabel where contained
syn match hsModuleStart "^module\(\s\|\n\)*\(\<\(\w\|\.\)*\>\)\(\s\|\n\)*"
\ contains=hsModuleStartLabel,hsModuleName
\ nextgroup=hsModuleCommentA,hsModuleExports,hsModuleWhereLabel
syn region hsModuleCommentA start="{-" end="-}"
\ contains=hsModuleCommentA,hsCommentTodo,@Spell contained
\ nextgroup=hsModuleCommentA,hsModuleExports,hsModuleWhereLabel skipwhite skipnl
syn match hsModuleCommentA "--.*\n"
\ contains=hsCommentTodo,@Spell contained
\ nextgroup=hsModuleCommentA,hsModuleExports,hsModuleWhereLabel skipwhite skipnl
syn match hsModuleExports "\(\w\*\)" contained
\ nextgroup=hsModuleCommentB,hsModuleWhereLabel skipwhite skipnl
\ contains=hsBlockComment,hsLineComment,hsType,hsDelimTypeExport,hs_hlFunctionName,hs_OpFunctionName,hsExportModule
syn match hsModuleCommentB "--.*\n"
\ contains=hsCommentTodo,@Spell contained
\ nextgroup=hsModuleCommentB,hsModuleWhereLabel skipwhite skipnl
syn region hsModuleCommentB start="{-" end="-}"
\ contains=hsModuleCommentB,hsCommentTodo,@Spell contained
\ nextgroup=hsModuleCommentB,hsModuleWhereLabel skipwhite skipnl
" end module highlighting
" FFI support
sy keyword hsFFIForeign foreign contained
"sy keyword hsFFIImportExport import export contained
sy keyword hsFFIImportExport export contained
sy keyword hsFFICallConvention ccall stdcall contained
sy keyword hsFFISafety safe unsafe contained
sy region hsFFIString start=+"+ skip=+\\\\\|\\"+ end=+"+ contained contains=hsSpecialChar
sy match hsFFI excludenl "\<foreign\>\(.\&[^\"]\)*\"\(.\)*\"\(\s\|\n\)*\(.\)*::"
\ keepend
\ contains=hsFFIForeign,hsFFIImportExport,hsFFICallConvention,hsFFISafety,hsFFIString,hs_OpFunctionName,hs_hlFunctionName
sy match hsNumber "\<[0-9]\+\>\|\<0[xX][0-9a-fA-F]\+\>\|\<0[oO][0-7]\+\>"
sy match hsFloat "\<[0-9]\+\.[0-9]\+\([eE][-+]\=[0-9]\+\)\=\>"
" Comments
sy keyword hsCommentTodo TODO FIXME XXX TBD contained
sy match hsLineComment "---*\([^-!#$%&\*\+./<=>\?@\\^|~].*\)\?$" contains=hsCommentTodo,@Spell
sy region hsBlockComment start="{-" end="-}" contains=hsBlockComment,hsCommentTodo,@Spell
sy region hsPragma start="{-#" end="#-}"
" QuasiQuotation
sy region hsQQ start="\[\$" end="|\]"me=e-2 keepend contains=hsQQVarID,hsQQContent nextgroup=hsQQEnd
sy region hsQQNew start="\[\(.\&[^|]\&\S\)*|" end="|\]"me=e-2 keepend contains=hsQQVarIDNew,hsQQContent nextgroup=hsQQEnd
sy match hsQQContent ".*" contained
sy match hsQQEnd "|\]" contained
sy match hsQQVarID "\[\$\(.\&[^|]\)*|" contained
sy match hsQQVarIDNew "\[\(.\&[^|]\)*|" contained
if exists("hs_highlight_debug")
" Debugging functions from the standard prelude.
syn keyword hsDebug undefined error trace
" C Preprocessor directives. Shamelessly ripped from c.vim and trimmed
" First, see whether to flag directive-like lines or not
if (!exists("hs_allow_hash_operator"))
syn match cError display "^\s*\(%:\|#\).*$"
" Accept %: for # (C99)
syn region cPreCondit start="^\s*\(%:\|#\)\s*\(if\|ifdef\|ifndef\|elif\)\>" skip="\\$" end="$" end="//"me=s-1 contains=cComment,cCppString,cCommentError
syn match cPreCondit display "^\s*\(%:\|#\)\s*\(else\|endif\)\>"
syn region cCppOut start="^\s*\(%:\|#\)\s*if\s\+0\+\>" end=".\@=\|$" contains=cCppOut2
syn region cCppOut2 contained start="0" end="^\s*\(%:\|#\)\s*\(endif\>\|else\>\|elif\>\)" contains=cCppSkip
syn region cCppSkip contained start="^\s*\(%:\|#\)\s*\(if\>\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\(%:\|#\)\s*endif\>" contains=cCppSkip
syn region cIncluded display contained start=+"+ skip=+\\\\\|\\"+ end=+"+
syn match cIncluded display contained "<[^>]*>"
syn match cInclude display "^\s*\(%:\|#\)\s*include\>\s*["<]" contains=cIncluded
syn cluster cPreProcGroup contains=cPreCondit,cIncluded,cInclude,cDefine,cCppOut,cCppOut2,cCppSkip,cCommentStartError
syn region cDefine matchgroup=cPreCondit start="^\s*\(%:\|#\)\s*\(define\|undef\)\>" skip="\\$" end="$"
syn region cPreProc matchgroup=cPreCondit start="^\s*\(%:\|#\)\s*\(pragma\>\|line\>\|warning\>\|warn\>\|error\>\)" skip="\\$" end="$" keepend
syn region cComment matchgroup=cCommentStart start="/\*" end="\*/" contains=cCommentStartError,cSpaceError contained
syntax match cCommentError display "\*/" contained
syntax match cCommentStartError display "/\*"me=e-1 contained
syn region cCppString start=+L\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial contained
if version >= 508 || !exists("did_hs_syntax_inits")
if version < 508
let did_hs_syntax_inits = 1
command -nargs=+ HiLink hi link <args>
command -nargs=+ HiLink hi def link <args>
HiLink hs_hlFunctionName Function
HiLink hs_HighliteInfixFunctionName Function
HiLink hs_HlInfixOp Function
HiLink hs_OpFunctionName Function
HiLink hsTypedef Typedef
HiLink hsVarSym hsOperator
HiLink hsConSym hsOperator
if exists("hs_highlight_delimiters")
" Some people find this highlighting distracting.
HiLink hsDelimiter Delimiter
HiLink hsModuleStartLabel Structure
HiLink hsExportModuleLabel Keyword
HiLink hsModuleWhereLabel Structure
HiLink hsModuleName Normal
HiLink hsImportIllegal Error
HiLink hsAsLabel hsImportLabel
HiLink hsHidingLabel hsImportLabel
HiLink hsImportLabel Include
HiLink hsImportMod Include
HiLink hsPackageString hsString
HiLink hsOperator Operator
HiLink hsInfix Keyword
HiLink hsStructure Structure
HiLink hsStatement Statement
HiLink hsConditional Conditional
HiLink hsSpecialCharError Error
HiLink hsSpecialChar SpecialChar
HiLink hsString String
HiLink hsFFIString String
HiLink hsCharacter Character
HiLink hsNumber Number
HiLink hsFloat Float
HiLink hsLiterateComment hsComment
HiLink hsBlockComment hsComment
HiLink hsLineComment hsComment
HiLink hsModuleCommentA hsComment
HiLink hsModuleCommentB hsComment
HiLink hsComment Comment
HiLink hsCommentTodo Todo
HiLink hsPragma SpecialComment
HiLink hsBoolean Boolean
if exists("hs_highlight_types")
HiLink hsDelimTypeExport hsType
HiLink hsType Type
HiLink hsDebug Debug
HiLink cCppString hsString
HiLink cCommentStart hsComment
HiLink cCommentError hsError
HiLink cCommentStartError hsError
HiLink cInclude Include
HiLink cPreProc PreProc
HiLink cDefine Macro
HiLink cIncluded hsString
HiLink cError Error
HiLink cPreCondit PreCondit
HiLink cComment Comment
HiLink cCppSkip cCppOut
HiLink cCppOut2 cCppOut
HiLink cCppOut Comment
HiLink hsFFIForeign Keyword
HiLink hsFFIImportExport Structure
HiLink hsFFICallConvention Keyword
HiLink hsFFISafety Keyword
HiLink hsTHIDTopLevel Macro
HiLink hsTHTopLevelName Macro
HiLink hsQQVarID Keyword
HiLink hsQQVarIDNew Keyword
HiLink hsQQEnd Keyword
HiLink hsQQContent String
delcommand HiLink
let b:current_syntax = "haskell"