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" Vim syntax file
" Language: Haskell
" Maintainer: Haskell Cafe mailinglist <haskell-cafe@haskell.org>
" Last Change: 2008 Dec 15
" 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
" Remove any old syntax stuff hanging around
if version < 600
syn clear
elseif 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_']*\>"
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_']*`"
" 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
syn match hsCharacter "[^a-zA-Z0-9_']'\([^\\]\|\\[^']\+\|\\'\)'"lc=1 contains=hsSpecialChar,hsSpecialCharError
syn match hsCharacter "^'\([^\\]\|\\[^']\+\|\\'\)'" contains=hsSpecialChar,hsSpecialCharError
syn match hsNumber "\<[0-9]\+\>\|\<0[xX][0-9a-fA-F]\+\>\|\<0[oO][0-7]\+\>"
syn match hsFloat "\<[0-9]\+\.[0-9]\+\([eE][-+]\=[0-9]\+\)\=\>"
" Keyword definitions. These must be patters 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
syn match hsImportMod contained "\<\(as\|qualified\|hiding\)\>"
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 "---*\([^-!#$%&\*\+./<=>\?@\\^|~].*\)\?$"
syn region hsBlockComment start="{-" end="-}" contains=hsBlockComment
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.
" For version 5.7 and earlier: only when not done already
" For version 5.8 and later: only when an item doesn't have highlighting yet
if version >= 508 || !exists("did_hs_syntax_inits")
if version < 508
let did_hs_syntax_inits = 1
command -nargs=+ HiLink hi link <args>
else
command -nargs=+ HiLink hi def link <args>
endif
HiLink hsModule hsStructure
HiLink hsImport Include
HiLink hsImportMod hsImport
HiLink hsInfix PreProc
HiLink hsStructure Structure
HiLink hsStatement Statement
HiLink hsConditional Conditional
HiLink hsSpecialChar SpecialChar
HiLink hsTypedef Typedef
HiLink hsVarSym hsOperator
HiLink hsConSym hsOperator
HiLink hsOperator Operator
if exists("hs_highlight_delimiters")
" Some people find this highlighting distracting.
HiLink hsDelimiter Delimiter
endif
HiLink hsSpecialCharError Error
HiLink hsString String
HiLink hsCharacter Character
HiLink hsNumber Number
HiLink hsFloat Float
HiLink hsConditional Conditional
HiLink hsLiterateComment hsComment
HiLink hsBlockComment hsComment
HiLink hsLineComment hsComment
HiLink hsComment Comment
HiLink hsPragma SpecialComment
HiLink hsBoolean Boolean
HiLink hsType Type
HiLink hsMaybe hsEnumConst
HiLink hsOrdering hsEnumConst
HiLink hsEnumConst Constant
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
delcommand HiLink
endif
let b:current_syntax = "haskell"
" Options for vi: ts=8 sw=2 sts=2 nowrap noexpandtab ft=vim
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