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" Vim syntax file
" Language: Haskell
" Maintainer: Haskell Cafe mailinglist <haskell-cafe@haskell.org>
" Last Change: 2018 Mar 29 by Marcin Szamotulski
" Original Author: John Williams <jrw@pobox.com>
"
" 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_more_types - Treat names of other common 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
"
" 2004 Feb 19: Added C preprocessor directive handling, corrected eol comments
" cleaned away literate haskell support (should be entirely in
" lhaskell.vim)
" 2004 Feb 20: Cleaned up C preprocessor directive handling, fixed single \
" in eol comment character class
" 2004 Feb 23: Made the leading comments somewhat clearer where it comes
" to attribution of work.
" 2008 Dec 15: Added comments as contained element in import statements
" quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif
" (Qualified) identifiers (no default highlighting)
syn match ConId "\(\<[A-Z][a-zA-Z0-9_']*\.\)\=\<[A-Z][a-zA-Z0-9_']*\>" contains=@NoSpell
syn match VarId "\(\<[A-Z][a-zA-Z0-9_']*\.\)\=\<[a-z][a-zA-Z0-9_']*\>" contains=@NoSpell
" 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_']*`"
" Reserved symbols--cannot be overloaded.
syn match hsDelimiter "(\|)\|\[\|\]\|,\|;\|_\|{\|}"
" Strings and constants
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 "\\&\|'''\+"
syn region hsString start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=hsSpecialChar,@NoSpell
syn match hsCharacter "[^a-zA-Z0-9_']'\([^\\]\|\\[^']\+\|\\'\)'"lc=1 contains=hsSpecialChar,hsSpecialCharError
syn match hsCharacter "^'\([^\\]\|\\[^']\+\|\\'\)'" contains=hsSpecialChar,hsSpecialCharError
syn match hsNumber "\v<[0-9]%(_*[0-9])*>|<0[xX]_*[0-9a-fA-F]%(_*[0-9a-fA-F])*>|<0[oO]_*%(_*[0-7])*>|<0[bB]_*[01]%(_*[01])*>"
syn match hsFloat "\v<[0-9]%(_*[0-9])*\.[0-9]%(_*[0-9])*%(_*[eE][-+]?[0-9]%(_*[0-9])*)?>|<[0-9]%(_*[0-9])*_*[eE][-+]?[0-9]%(_*[0-9])*>|<0[xX]_*[0-9a-fA-F]%(_*[0-9a-fA-F])*\.[0-9a-fA-F]%(_*[0-9a-fA-F])*%(_*[pP][-+]?[0-9]%(_*[0-9])*)?>|<0[xX]_*[0-9a-fA-F]%(_*[0-9a-fA-F])*_*[pP][-+]?[0-9]%(_*[0-9])*>"
" Keyword definitions. These must be patterns instead of keywords
" because otherwise they would match as keywords at the start of a
" "literate" comment (see lhs.vim).
syn match hsModule "\<module\>"
syn match hsImport "\<import\>.*"he=s+6 contains=hsImportMod,hsLineComment,hsBlockComment,@NoSpell
syn match hsImportMod contained "\<\(as\|qualified\|hiding\)\>" contains=@NoSpell
syn match hsInfix "\<\(infix\|infixl\|infixr\)\>"
syn match hsStructure "\<\(class\|data\|deriving\|instance\|default\|where\)\>"
syn match hsTypedef "\<\(type\|newtype\)\>"
syn match hsStatement "\<\(do\|case\|of\|let\|in\)\>"
syn match hsConditional "\<\(if\|then\|else\)\>"
" Not real keywords, but close.
if exists("hs_highlight_boolean")
" Boolean constants from the standard prelude.
syn match hsBoolean "\<\(True\|False\)\>"
endif
if exists("hs_highlight_types")
" Primitive types from the standard prelude and libraries.
syn match hsType "\<\(Int\|Integer\|Char\|Bool\|Float\|Double\|IO\|Void\|Addr\|Array\|String\)\>"
endif
if exists("hs_highlight_more_types")
" Types from the standard prelude libraries.
syn match hsType "\<\(Maybe\|Either\|Ratio\|Complex\|Ordering\|IOError\|IOResult\|ExitCode\)\>"
syn match hsMaybe "\<Nothing\>"
syn match hsExitCode "\<\(ExitSuccess\)\>"
syn match hsOrdering "\<\(GT\|LT\|EQ\)\>"
endif
if exists("hs_highlight_debug")
" Debugging functions from the standard prelude.
syn match hsDebug "\<\(undefined\|error\|trace\)\>"
endif
" Comments
syn match hsLineComment "---*\([^-!#$%&\*\+./<=>\?@\\^|~].*\)\?$" contains=@Spell
syn region hsBlockComment start="{-" end="-}" contains=hsBlockComment,@Spell
syn region hsPragma start="{-#" end="#-}"
" 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*\(%:\|#\).*$"
endif
" 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
" Define the default highlighting.
" Only when an item doesn't have highlighting yet
hi def link hsModule hsStructure
hi def link hsImport Include
hi def link hsImportMod hsImport
hi def link hsInfix PreProc
hi def link hsStructure Structure
hi def link hsStatement Statement
hi def link hsConditional Conditional
hi def link hsSpecialChar SpecialChar
hi def link hsTypedef Typedef
hi def link hsVarSym hsOperator
hi def link hsConSym hsOperator
hi def link hsOperator Operator
if exists("hs_highlight_delimiters")
" Some people find this highlighting distracting.
hi def link hsDelimiter Delimiter
endif
hi def link hsSpecialCharError Error
hi def link hsString String
hi def link hsCharacter Character
hi def link hsNumber Number
hi def link hsFloat Float
hi def link hsConditional Conditional
hi def link hsLiterateComment hsComment
hi def link hsBlockComment hsComment
hi def link hsLineComment hsComment
hi def link hsComment Comment
hi def link hsPragma SpecialComment
hi def link hsBoolean Boolean
hi def link hsType Type
hi def link hsMaybe hsEnumConst
hi def link hsOrdering hsEnumConst
hi def link hsEnumConst Constant
hi def link hsDebug Debug
hi def link cCppString hsString
hi def link cCommentStart hsComment
hi def link cCommentError hsError
hi def link cCommentStartError hsError
hi def link cInclude Include
hi def link cPreProc PreProc
hi def link cDefine Macro
hi def link cIncluded hsString
hi def link cError Error
hi def link cPreCondit PreCondit
hi def link cComment Comment
hi def link cCppSkip cCppOut
hi def link cCppOut2 cCppOut
hi def link cCppOut Comment
let b:current_syntax = "haskell"
" Options for vi: ts=8 sw=2 sts=2 nowrap noexpandtab ft=vim