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" Vim syntax file
" Language:		M4
" Maintainer:	Claudio Fleiner (claudio@fleiner.com)
" URL:			http://www.fleiner.com/vim/syntax/m4.vim
" Last Change:	2005 Jan 15

" This file will highlight user function calls if they use only
" capital letters and have at least one argument (i.e. the '('
" must be there). Let me know if this is a problem.

" For version 5.x: Clear all syntax items
" For version 6.x: Quit when a syntax file was already loaded
if !exists("main_syntax")
  if version < 600
    syntax clear
  elseif exists("b:current_syntax")
  finish
endif
" we define it here so that included files can test for it
  let main_syntax='m4'
endif

" define the m4 syntax
syn match  m4Variable contained "\$\d\+"
syn match  m4Special  contained "$[@*#]"
syn match  m4Comment  "\<\(m4_\)\=dnl\>.*" contains=SpellErrors
syn match  m4Constants "\<\(m4_\)\=__file__"
syn match  m4Constants "\<\(m4_\)\=__line__"
syn keyword m4Constants divnum sysval m4_divnum m4_sysval
syn region m4Paren    matchgroup=m4Delimiter start="(" end=")" contained contains=@m4Top
syn region m4Command  matchgroup=m4Function  start="\<\(m4_\)\=\(define\|defn\|pushdef\)(" end=")" contains=@m4Top
syn region m4Command  matchgroup=m4Preproc   start="\<\(m4_\)\=\(include\|sinclude\)("he=e-1 end=")" contains=@m4Top
syn region m4Command  matchgroup=m4Statement start="\<\(m4_\)\=\(syscmd\|esyscmd\|ifdef\|ifelse\|indir\|builtin\|shift\|errprint\|m4exit\|changecom\|changequote\|changeword\|m4wrap\|debugfile\|divert\|undivert\)("he=e-1 end=")" contains=@m4Top
syn region m4Command  matchgroup=m4builtin start="\<\(m4_\)\=\(len\|index\|regexp\|substr\|translit\|patsubst\|format\|incr\|decr\|eval\|maketemp\)("he=e-1 end=")" contains=@m4Top
syn keyword m4Statement divert undivert
syn region m4Command  matchgroup=m4Type      start="\<\(m4_\)\=\(undefine\|popdef\)("he=e-1 end=")" contains=@m4Top
syn region m4Function matchgroup=m4Type      start="\<[_A-Z][_A-Z0-9]*("he=e-1 end=")" contains=@m4Top
syn region m4String   start="`" end="'" contained contains=@m4Top,@m4StringContents,SpellErrors
syn cluster m4Top     contains=m4Comment,m4Constants,m4Special,m4Variable,m4String,m4Paren,m4Command,m4Statement,m4Function

" 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_m4_syn_inits")
  if version < 508
    let did_m4_syn_inits = 1
    command -nargs=+ HiLink hi link <args>
  else
    command -nargs=+ HiLink hi def link <args>
  endif
  HiLink m4Delimiter Delimiter
  HiLink m4Comment   Comment
  HiLink m4Function  Function
  HiLink m4Keyword   Keyword
  HiLink m4Special   Special
  HiLink m4String    String
  HiLink m4Statement Statement
  HiLink m4Preproc   PreProc
  HiLink m4Type      Type
  HiLink m4Special   Special
  HiLink m4Variable  Special
  HiLink m4Constants Constant
  HiLink m4Builtin   Statement
  delcommand HiLink
endif

let b:current_syntax = "m4"

if main_syntax == 'm4'
  unlet main_syntax
endif

" vim: ts=4
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