sxml.vim

" Vim syntax file
" Language:    SXML (S-Expression Markup Language)
" Filetype:    sxml

if exists("b:current_syntax")
  finish
endif

syn case match

" Regular brackets with nextgroup to pick up the first element
syn match sxmlOpenBracket  "(" nextgroup=sxmlTagName,sxmlAttrOp skipwhite skipempty skipnl
syn match sxmlCloseBracket ")"

" First element of an sexp: tag name (does not start with @, (, or ))
syn match sxmlTagName "[^@() \t\n][^() \t\n]*" contained

" Attribute operator: @name — the whole @word is the attribute
syn match sxmlAttrOp "@[^() \t\n]*" contained

" Double-bracket escape region — plain text, no colouring or sub-syntax.
" Must be defined last to take priority over sxmlOpenBracket at the same position.
syn region sxmlDoubleRegion start="((" end="))" keepend

hi def link sxmlOpenBracket  Delimiter
hi def link sxmlCloseBracket Delimiter
hi def link sxmlTagName      htmlTagName
hi def link sxmlAttrOp       htmlArg

syn sync minlines=50

let b:current_syntax = "sxml"