fix: keep empty list after blockquote as a sibling block

A blockquote followed by a bare list marker line (for example
`> foo\n-`) wrongly nested an empty list inside the blockquote.

The blockquote regex reuses the paragraph list-interrupt clause
` {0,3}(?:[*+-]|1[.)])[ \t]+[^ \t\n]`, whose trailing `[ \t]+[^ \t\n]`
requires content after the marker. A bare marker line therefore was
not seen as an interruption and got lazily continued into the
blockquote paragraph, then re-lexed into a nested empty list.

Give the blockquote its own paragraph variant whose list-interrupt
clause also matches a bare marker, so the list ends the blockquote and
becomes a sibling block. The top level paragraph rule is unchanged, so
an empty list still cannot interrupt a paragraph.

Author: spokodev

src/rules.ts

@@ -177,8 +177,10 @@ const createParagraph = (listInterrupt: RegExp) => edit(_paragraph)
 
 // only non-empty lists starting from 1 can interrupt paragraphs
 const paragraph = createParagraph(/ {0,3}(?:[*+-]|1[.)])[ \t]+[^ \t\n]/);
-// blockquotes can be interrupted by lists starting from any number
-const blockquoteParagraph = createParagraph(/ {0,3}(?:[*+-]|\d{1,9}[.)])[ \t]+[^ \t\n]/);
+// inside a blockquote a bare list marker (any number) starts a sibling list,
+// so it must not be lazily continued as paragraph text (unlike a top level
+// paragraph, where an empty list cannot interrupt)
+const blockquoteParagraph = createParagraph(/ {0,3}(?:[*+-]|\d{1,9}[.)])(?:[ \t]|\n|$)/);
 
 const blockquote = edit(/^( {0,3}> ?(paragraph|[^\n]*)(?:\n|$))+/)
   .replace('paragraph', blockquoteParagraph)

test/specs/new/empty_list_after_blockquote.html

@@ -0,0 +1,13 @@
+<blockquote>
+<p>foo</p>
+</blockquote>
+<ul>
+<li></li>
+</ul>
+<blockquote>
+<p>foo
+bar</p>
+</blockquote>
+<ol>
+<li></li>
+</ol>

test/specs/new/empty_list_after_blockquote.md

@@ -0,0 +1,6 @@
+> foo
+-
+
+> foo
+> bar
+1.