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Don't let emphasis span multiple paragraphs

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Most markdown implementations do not allow emphasis to span multiple
paragraphs. For example, commonmark.js, Markdown.pl, pandoc, and
Python-Markdown compile the following markdown

```markdown
*asdf

asdf*
```

to

```html
<p>*asdf</p>
<p>asdf*</p>
```

Some implementations compile it to

```html
<p><em>asdf</em></p>
<p>asdf*</p>
```

See https://johnmacfarlane.net/babelmark2/?normalize=1&text=*asdf%0A%0Aasdf*

Adding "^$" to :syn-end makes the emphasis end at an empty line like the
second compiled HTML above. While not perfect, it prevents an unmatched
`*` from emphasizing the entirety of the following text.
This commit is contained in:
Jaehwang Jerry Jung
2022-01-12 18:49:39 +09:00
committed by Tim Pope
parent ec486958ea
commit 59a551feb2
1 changed files with 6 additions and 6 deletions
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12
syntax/markdown.vim
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@@ -110,12 +110,12 @@ let s:concealends = ''
if has('conceal') && get(g:, 'markdown_syntax_conceal', 1) == 1
let s:concealends = ' concealends'
endif
exe 'syn region markdownItalic matchgroup=markdownItalicDelimiter start="\*\S\@=" end="\S\@<=\*" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownItalic matchgroup=markdownItalicDelimiter start="\w\@<!_\S\@=" end="\S\@<=_\w\@!" skip="\\_" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\*\*\S\@=" end="\S\@<=\*\*" skip="\\\*" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\w\@<!__\S\@=" end="\S\@<=__\w\@!" skip="\\_" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\*\*\*\S\@=" end="\S\@<=\*\*\*" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\w\@<!___\S\@=" end="\S\@<=___\w\@!" skip="\\_" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownItalic matchgroup=markdownItalicDelimiter start="\*\S\@=" end="\S\@<=\*\|^$" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownItalic matchgroup=markdownItalicDelimiter start="\w\@<!_\S\@=" end="\S\@<=_\w\@!\|^$" skip="\\_" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\*\*\S\@=" end="\S\@<=\*\*\|^$" skip="\\\*" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\w\@<!__\S\@=" end="\S\@<=__\w\@!\|^$" skip="\\_" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\*\*\*\S\@=" end="\S\@<=\*\*\*\|^$" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\w\@<!___\S\@=" end="\S\@<=___\w\@!\|^$" skip="\\_" contains=markdownLineStart,@Spell' . s:concealends
syn region markdownCode matchgroup=markdownCodeDelimiter start="`" end="`" keepend contains=markdownLineStart
syn region markdownCode matchgroup=markdownCodeDelimiter start="`` \=" end=" \=``" keepend contains=markdownLineStart