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" Vim syntax file
" Language:     Markdown
" Maintainer:   Tim Pope <vimNOSPAM@tpope.org>
" Filenames:    *.markdown
" Last Change:  2013 May 30

if exists("b:current_syntax")
  finish
endif

if !exists('main_syntax')
  let main_syntax = 'markdown'
endif

runtime! syntax/html.vim
unlet! b:current_syntax

if !exists('g:markdown_fenced_languages')
  let g:markdown_fenced_languages = []
endif
for s:type in
map(copy(g:markdown_fenced_languages),'matchstr(v:val,"[^=]*$")')
  if s:type =~ '\.'
    let b:{matchstr(s:type,'[^.]*')}_subtype =
matchstr(s:type,'\.\zs.*')
  endif
  exe 'syn include
@markdownHighlight'.substitute(s:type,'\.','','g').'
syntax/'.matchstr(s:type,'[^.]*').'.vim'
  unlet! b:current_syntax
endfor
unlet! s:type

syn sync minlines=10
syn case ignore

syn match markdownValid '[<>]\c[a-z/$!]\@!'
syn match markdownValid '&\%(#\=\w*;\)\@!'

syn match markdownLineStart "^[<@]\@!"
nextgroup=@markdownBlock,htmlSpecialChar

syn cluster markdownBlock
contains=markdownH1,markdownH2,markdownH3,markdownH4,markdownH5,markdownH6,markdownBlockquote,markdownListMarker,markdownOrderedListMarker,markdownCodeBlock,markdownRule
syn cluster markdownInline
contains=markdownLineBreak,markdownLinkText,markdownItalic,markdownBold,markdownCode,markdownEscape,@htmlTop,markdownError

syn match markdownH1 "^.\+\n=\+$" contained
contains=@markdownInline,markdownHeadingRule,markdownAutomaticLink
syn match markdownH2 "^.\+\n-\+$" contained
contains=@markdownInline,markdownHeadingRule,markdownAutomaticLink

syn match markdownHeadingRule "^[=-]\+$" contained

syn region markdownH1 matchgroup=markdownHeadingDelimiter
start="##\@!"      end="#*\s*$" keepend oneline
contains=@markdownInline,markdownAutomaticLink contained
syn region markdownH2 matchgroup=markdownHeadingDelimiter
start="###\@!"     end="#*\s*$" keepend oneline
contains=@markdownInline,markdownAutomaticLink contained
syn region markdownH3 matchgroup=markdownHeadingDelimiter
start="####\@!"    end="#*\s*$" keepend oneline
contains=@markdownInline,markdownAutomaticLink contained
syn region markdownH4 matchgroup=markdownHeadingDelimiter
start="#####\@!"   end="#*\s*$" keepend oneline
contains=@markdownInline,markdownAutomaticLink contained
syn region markdownH5 matchgroup=markdownHeadingDelimiter
start="######\@!"  end="#*\s*$" keepend oneline
contains=@markdownInline,markdownAutomaticLink contained
syn region markdownH6 matchgroup=markdownHeadingDelimiter
start="#######\@!" end="#*\s*$" keepend oneline
contains=@markdownInline,markdownAutomaticLink contained

syn match markdownBlockquote ">\%(\s\|$\)" contained
nextgroup=@markdownBlock

syn region markdownCodeBlock start="    \|\t" end="$"
contained

" TODO: real nesting
syn match markdownListMarker "\%(\t\|
\{0,4\}\)[-*+]\%(\s\+\S\)\@=" contained
syn match markdownOrderedListMarker "\%(\t\|
\{0,4}\)\<\d\+\.\%(\s\+\S\)\@=" contained

syn match markdownRule "\* *\* *\*[ *]*$" contained
syn match markdownRule "- *- *-[ -]*$" contained

syn match markdownLineBreak " \{2,\}$"

syn region markdownIdDeclaration matchgroup=markdownLinkDelimiter
start="^ \{0,3\}!\=\[" end="\]:" oneline keepend
nextgroup=markdownUrl skipwhite
syn match markdownUrl "\S\+" nextgroup=markdownUrlTitle skipwhite
contained
syn region markdownUrl matchgroup=markdownUrlDelimiter
start="<" end=">" oneline keepend
nextgroup=markdownUrlTitle skipwhite contained
syn region markdownUrlTitle matchgroup=markdownUrlTitleDelimiter
start=+"+ end=+"+ keepend contained
syn region markdownUrlTitle matchgroup=markdownUrlTitleDelimiter
start=+'+ end=+'+ keepend contained
syn region markdownUrlTitle matchgroup=markdownUrlTitleDelimiter start=+(+
end=+)+ keepend contained

syn region markdownLinkText matchgroup=markdownLinkTextDelimiter
start="!\=\[\%(\_[^]]*]\%( \=[[(]\)\)\@=" end="\]\%(
\=[[(]\)\@=" keepend nextgroup=markdownLink,markdownId skipwhite
contains=@markdownInline,markdownLineStart
syn region markdownLink matchgroup=markdownLinkDelimiter
start="(" end=")" contains=markdownUrl keepend
contained
syn region markdownId matchgroup=markdownIdDelimiter start="\["
end="\]" keepend contained
syn region markdownAutomaticLink matchgroup=markdownUrlDelimiter
start="<\%(\w\+:\|[[:alnum:]_+-]\+@\)\@=" end=">"
keepend oneline

syn region markdownItalic start="\S\@<=\*\|\*\S\@="
end="\S\@<=\*\|\*\S\@=" keepend contains=markdownLineStart
syn region markdownItalic start="\S\@<=_\|_\S\@="
end="\S\@<=_\|_\S\@=" keepend contains=markdownLineStart
syn region markdownBold start="\S\@<=\*\*\|\*\*\S\@="
end="\S\@<=\*\*\|\*\*\S\@=" keepend
contains=markdownLineStart,markdownItalic
syn region markdownBold start="\S\@<=__\|__\S\@="
end="\S\@<=__\|__\S\@=" keepend
contains=markdownLineStart,markdownItalic
syn region markdownBoldItalic
start="\S\@<=\*\*\*\|\*\*\*\S\@="
end="\S\@<=\*\*\*\|\*\*\*\S\@=" keepend
contains=markdownLineStart
syn region markdownBoldItalic start="\S\@<=___\|___\S\@="
end="\S\@<=___\|___\S\@=" keepend contains=markdownLineStart
syn region markdownCode matchgroup=markdownCodeDelimiter
start="`" end="`" keepend contains=markdownLineStart
syn region markdownCode matchgroup=markdownCodeDelimiter start="``
\=" end=" \=``" keepend contains=markdownLineStart
syn region markdownCode matchgroup=markdownCodeDelimiter
start="^\s*```.*$" end="^\s*```\ze\s*$" keepend

if main_syntax ==# 'markdown'
  for s:type in g:markdown_fenced_languages
    exe 'syn region
markdownHighlight'.substitute(matchstr(s:type,'[^=]*$'),'\..*','','').'
matchgroup=markdownCodeDelimiter
start="^\s*```'.matchstr(s:type,'[^=]*').'\>.*$"
end="^\s*```\ze\s*$" keepend
contains=@markdownHighlight'.substitute(matchstr(s:type,'[^=]*$'),'\.','','g')
  endfor
  unlet! s:type
endif

syn match markdownEscape "\\[][\\`*_{}()#+.!-]"
syn match markdownError "\w\@<=_\w\@="

hi def link markdownH1                    htmlH1
hi def link markdownH2                    htmlH2
hi def link markdownH3                    htmlH3
hi def link markdownH4                    htmlH4
hi def link markdownH5                    htmlH5
hi def link markdownH6                    htmlH6
hi def link markdownHeadingRule           markdownRule
hi def link markdownHeadingDelimiter      Delimiter
hi def link markdownOrderedListMarker     markdownListMarker
hi def link markdownListMarker            htmlTagName
hi def link markdownBlockquote            Comment
hi def link markdownRule                  PreProc

hi def link markdownLinkText              htmlLink
hi def link markdownIdDeclaration         Typedef
hi def link markdownId                    Type
hi def link markdownAutomaticLink         markdownUrl
hi def link markdownUrl                   Float
hi def link markdownUrlTitle              String
hi def link markdownIdDelimiter           markdownLinkDelimiter
hi def link markdownUrlDelimiter          htmlTag
hi def link markdownUrlTitleDelimiter     Delimiter

hi def link markdownItalic                htmlItalic
hi def link markdownBold                  htmlBold
hi def link markdownBoldItalic            htmlBoldItalic
hi def link markdownCodeDelimiter         Delimiter

hi def link markdownEscape                Special
hi def link markdownError                 Error

let b:current_syntax = "markdown"
if main_syntax ==# 'markdown'
  unlet main_syntax
endif

" vim:set sw=2: