" Vim syntax file
" Language:   SML
" Maintainers:   Fabrizio Zeno Cornelli <zeno@filibusta.crema.unimi.it>
" Last change:   2000 May 18

" There are two sets of highlighting in here:
" If the "sml_highlighting_clean" variable exists, it is rather sparse.
" Otherwise you get more highlighting.

" Remove any old syntax stuff hanging around.
syn clear

" Sml is case sensitive.
syn case match

" Very simple highlighting for comments, clause heads and
" character codes.  It respects sml strings and atoms.

syn region   smlComment     start=+(\*+ end=+\*)+

syn keyword  smlKeyword      fun val let in end
syn match    smlCharCode     +0'\\\=.+
syn region   smlString       start=+"+ skip=+\\"+ end=+"+
syn region   smlAtom         start=+'+ skip=+\\'+ end=+'+

if !exists("sml_highlighting_clean")

  " some keywords
  " some common predicates are also highlighted as keywords
  " is there a better solution?
  syn keyword smlKeyword   Real Integer 

  syn match   smlOperator ">=\|=\|<\|>"

  syn match   smlNumber            "\<[0123456789]*\>"
  syn match   smlCommentError      "\*/"
  syn match   smlSpecialCharacter  ";"


endif

syn sync ccomment maxlines=50

if !exists("did_sml_syntax_inits")

  let did_sml_syntax_inits = 1

  " The default methods for highlighting.  Can be overridden later

  hi link smlComment    Comment
  hi link smlCharCode   Special

  if exists ("sml_highlighting_clean")

    hi link smlKeyword      Statement

  else

    hi link smlKeyword          Keyword
    hi link smlSpecialCharacter Special
    hi link smlNumber           Number
    hi link smlAtom             String
    hi link smlString           String
    hi link smlOperator         Operator

  endif

endif

let b:current_syntax = "sml"

" vim: ts=28