" Vim syntax file
" Language: Markdown
" Maintainer: Tim Pope <[email protected]>
" 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: