" Vim syntax file
" Language:			ESTEREL
" Maintainer:		Maurizio Tranchero <maurizio.tranchero@polito.it> - <maurizio.tranchero@gmail.com>
" Credits:			Luca Necchi	<luca.necchi@polito.it>
" First Release:	Tue May 17 23:49:39 CEST 2005
" Last Change:		Sat Apr 22 14:56:41 CEST 2006
" Version:			0.5

" 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

" case is significant
syn case ignore
" Esterel Regions
syn region esterelModule					start=/module/		end=/end module/	contains=ALLBUT,esterelModule
syn region esterelLoop						start=/loop/		end=/end loop/		contains=ALLBUT,esterelModule
syn region esterelAbort						start=/abort/		end=/when/			contains=ALLBUT,esterelModule
syn region esterelAbort						start=/weak abort/	end=/when/			contains=ALLBUT,esterelModule
syn region esterelEvery						start=/every/		end=/end every/		contains=ALLBUT,esterelModule
syn region esterelIf						start=/if/			end=/end if/		contains=ALLBUT,esterelModule
syn region esterelConcurrent	transparent start=/\[/			end=/\]/			contains=ALLBUT,esterelModule
syn region esterelIfThen					start=/if/			end=/then/			oneline
" Esterel Keywords
syn keyword esterelIO			input output inputoutput constant
syn keyword esterelBoolean		and or not xor xnor nor nand
syn keyword esterelExpressions	mod 
syn keyword esterelStatement	nothing halt
syn keyword esterelStatement	module signal sensor end
syn keyword esterelStatement	every do loop abort weak
syn keyword esterelStatement	emit present await
syn keyword esterelStatement	pause when immediate
syn keyword esterelStatement	if then else case
syn keyword esterelStatement	var in  run  suspend
syn keyword esterelStatement	repeat times combine with
syn keyword esterelStatement	assert sustain
" check what it is the following
syn keyword esterelStatement	relation						
syn keyword esterelFunctions	function procedure task
syn keyword esterelSysCall		call trap exit exec
" Esterel Types
syn keyword esterelType integer float bolean
" Esterel Comment
syn match esterelComment	"%.*$"
" Operators and special characters
syn match esterelSpecial	":"
syn match esterelSpecial	"<="
syn match esterelSpecial	">="
syn match esterelSpecial	";"
syn match esterelOperator	"\["
syn match esterelOperator	"\]"
syn match esterelOperator	":="
syn match esterelStatement	"\<\(if\|else\)\>"
syn match esterelNone		"\<else\s\+if\>$"
syn match esterelNone		"\<else\s\+if\>\s"

" Class Linking
if version >= 508 || !exists("did_esterel_syntax_inits")
  if version < 508
    let did_esterel_syntax_inits = 1
    command -nargs=+ HiLink hi link <args>
  else
    command -nargs=+ HiLink hi def link <args>
  endif

	HiLink esterelStatement		Statement
	HiLink esterelType			Type
	HiLink esterelComment		Comment
	HiLink esterelBoolean		Number
	HiLink esterelExpressions	Number
	HiLink esterelIO			String
	HiLink esterelOperator		Type
	HiLink esterelSysCall		Type
	HiLink esterelFunctions		Type
	HiLink esterelSpecial		Special

  delcommand HiLink
endif

let b:current_syntax = "esterel"