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/usr/share/vim/vim74/syntax/xpm2.vim is in vim-runtime 2:7.4.052-1ubuntu3.

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" Vim syntax file
" Language:	X Pixmap v2
" Maintainer:	Steve Wall (hitched97@velnet.com)
" Last Change:	2012 Jun 01
" 		(Dominique Pelle added @Spell)
" Version:	5.8
"
" Made from xpm.vim by Ronald Schild <rs@scutum.de>

" For version 5.x: Clear all syntax items
" For version 6.x: Quit when a syntax file was already loaded
if version < 600
  syntax clear
elseif exists("b:current_syntax")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

syn region  xpm2PixelString	start="^"  end="$"  contains=@xpm2Colors
syn keyword xpm2Todo		TODO FIXME XXX  contained
syn match   xpm2Comment		"\!.*$"  contains=@Spell,xpm2Todo


if version < 508
  command -nargs=+ HiLink hi link <args>
  command -nargs=+ Hi hi <args>
else
  command -nargs=+ HiLink hi def link <args>
  command -nargs=+ Hi hi def <args>
endif

if has("gui_running")

  let color  = ""
  let chars  = ""
  let colors = 0
  let cpp    = 0
  let n      = 0
  let i      = 1

  while i <= line("$")		" scanning all lines

    let s = getline(i)
    if match(s,"\!.*$") != -1
      let s = matchstr(s, "^[^\!]*")
    endif
    if s != ""			" does line contain a string?

      if n == 0			" first string is the Values string

	" get the 3rd value: colors = number of colors
	let colors = substitute(s, '\s*\d\+\s\+\d\+\s\+\(\d\+\).*', '\1', '')
	" get the 4th value: cpp = number of character per pixel
	let cpp = substitute(s, '\s*\d\+\s\+\d\+\s\+\d\+\s\+\(\d\+\).*', '\1', '')
	if cpp =~ '[^0-9]'
	  break  " if cpp is not made of digits there must be something wrong
	endif

	" Highlight the Values string as normal string (no pixel string).
	" Only when there is no slash, it would terminate the pattern.
	if s !~ '/'
	  exe 'syn match xpm2Values /' . s . '/'
	endif
	HiLink xpm2Values Statement

	let n = 1			" n = color index

      elseif n <= colors		" string is a color specification

	" get chars = <cpp> length string representing the pixels
	" (first incl. the following whitespace)
	let chars = substitute(s, '\(.\{'.cpp.'}\s\+\).*', '\1', '')

	" now get color, first try 'c' key if any (color visual)
	let color = substitute(s, '.*\sc\s\+\(.\{-}\)\s*\(\(g4\=\|[ms]\)\s.*\)*\s*', '\1', '')
	if color == s
	  " no 'c' key, try 'g' key (grayscale with more than 4 levels)
	  let color = substitute(s, '.*\sg\s\+\(.\{-}\)\s*\(\(g4\|[ms]\)\s.*\)*\s*', '\1', '')
	  if color == s
	    " next try: 'g4' key (4-level grayscale)
	    let color = substitute(s, '.*\sg4\s\+\(.\{-}\)\s*\([ms]\s.*\)*\s*', '\1', '')
	    if color == s
	      " finally try 'm' key (mono visual)
	      let color = substitute(s, '.*\sm\s\+\(.\{-}\)\s*\(s\s.*\)*\s*', '\1', '')
	      if color == s
		let color = ""
	      endif
	    endif
	  endif
	endif

	" Vim cannot handle RGB codes with more than 6 hex digits
	if color =~ '#\x\{10,}$'
	  let color = substitute(color, '\(\x\x\)\x\x', '\1', 'g')
	elseif color =~ '#\x\{7,}$'
	  let color = substitute(color, '\(\x\x\)\x', '\1', 'g')
	" nor with 3 digits
	elseif color =~ '#\x\{3}$'
	  let color = substitute(color, '\(\x\)\(\x\)\(\x\)', '0\10\20\3', '')
	endif

	" escape meta characters in patterns
	let s = escape(s, '/\*^$.~[]')
	let chars = escape(chars, '/\*^$.~[]')

	" change whitespace to "\s\+"
	let s = substitute(s, "[ \t][ \t]*", "\\\\s\\\\+", "g")
	let chars = substitute(chars, "[ \t][ \t]*", "\\\\s\\\\+", "g")

	" now create syntax items
	" highlight the color string as normal string (no pixel string)
	exe 'syn match xpm2Col'.n.'Def /'.s.'/ contains=xpm2Col'.n.'inDef'
	exe 'HiLink xpm2Col'.n.'Def Constant'

	" but highlight the first whitespace after chars in its color
	exe 'syn match xpm2Col'.n.'inDef /^'.chars.'/hs=s+'.(cpp).' contained'
	exe 'HiLink xpm2Col'.n.'inDef xpm2Color'.n

	" remove the following whitespace from chars
	let chars = substitute(chars, '\\s\\+$', '', '')

	" and create the syntax item contained in the pixel strings
	exe 'syn match xpm2Color'.n.' /'.chars.'/ contained'
	exe 'syn cluster xpm2Colors add=xpm2Color'.n

	" if no color or color = "None" show background
	if color == ""  ||  substitute(color, '.*', '\L&', '') == 'none'
	  exe 'Hi xpm2Color'.n.' guifg=bg guibg=NONE'
	elseif color !~ "'"
	  exe 'Hi xpm2Color'.n." guifg='".color."' guibg='".color."'"
	endif
	let n = n + 1
      else
	break			" no more color string
      endif
    endif
    let i = i + 1
  endwhile

  unlet color chars colors cpp n i s

endif		" has("gui_running")

" 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_xpm2_syntax_inits")
  if version < 508
    let did_xpm2_syntax_inits = 1
  endif

  " The default highlighting.
  HiLink xpm2Type		Type
  HiLink xpm2StorageClass	StorageClass
  HiLink xpm2Todo		Todo
  HiLink xpm2Comment		Comment
  HiLink xpm2PixelString	String
endif
delcommand HiLink
delcommand Hi

let b:current_syntax = "xpm2"

let &cpo = s:cpo_save
unlet s:cpo_save
" vim: ts=8:sw=2:noet: