fix: fix strikethrough inside strong and em to follow gfm (#3577)

UziTech · web-flow · commit 7712a5324f25 · 2025-01-06T08:50:34.000-07:00
* fix: fix strikethrough inside strong and em to follow gfm

* add both sides tests
diff --git a/src/rules.ts b/src/rules.ts
@@ -257,10 +257,16 @@ const _notPunctuationOrSpaceGfmStrongEm = /(?:[^\s\p{P}\p{S}]|~)/u;
 // sequences em should skip over [title](link), `code`, <html>
 const blockSkip = /\[[^[\]]*?\]\((?:\\.|[^\\\(\)]|\((?:\\.|[^\\\(\)])*\))*\)|`[^`]*?`|<[^<>]*?>/g;
 
-const emStrongLDelim = edit(/^(?:\*+(?:((?!\*)punct)|[^\s*]))|^_+(?:((?!_)punct)|([^\s_]))/, 'u')
+const emStrongLDelimCore = /^(?:\*+(?:((?!\*)punct)|[^\s*]))|^_+(?:((?!_)punct)|([^\s_]))/;
+
+const emStrongLDelim = edit(emStrongLDelimCore, 'u')
   .replace(/punct/g, _punctuation)
   .getRegex();
 
+const emStrongLDelimGfm = edit(emStrongLDelimCore, 'u')
+  .replace(/punct/g, _punctuationGfmStrongEm)
+  .getRegex();
+
 const emStrongRDelimAstCore =
   '^[^_*]*?__[^_*]*?\\*[^_*]*?(?=__)' // Skip orphan inside strong
 + '|[^*]+(?=[^*])' // Consume to delim
@@ -389,6 +395,7 @@ const inlinePedantic: Record<InlineKeys, RegExp> = {
 const inlineGfm: Record<InlineKeys, RegExp> = {
   ...inlineNormal,
   emStrongRDelimAst: emStrongRDelimAstGfm,
+  emStrongLDelim: emStrongLDelimGfm,
   url: edit(/^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/, 'i')
     .replace('email', /[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/)
     .getRegex(),
diff --git a/test/specs/new/strikethrough_in_em_strong.html b/test/specs/new/strikethrough_in_em_strong.html
@@ -13,3 +13,35 @@
 <p>__<del>a</del>__b</p>
 
 <p>__<del>a</del>__b</p>
+
+<p>b<em><del>a</del></em></p>
+
+<p>b<em><del>a</del></em></p>
+
+<p>b<strong><del>a</del></strong></p>
+
+<p>b<strong><del>a</del></strong></p>
+
+<p>b_<del>a</del>_</p>
+
+<p>b_<del>a</del>_</p>
+
+<p>b__<del>a</del>__</p>
+
+<p>b__<del>a</del>__</p>
+
+<p>b<em><del>a</del></em>b</p>
+
+<p>b<em><del>a</del></em>b</p>
+
+<p>b<strong><del>a</del></strong>b</p>
+
+<p>b<strong><del>a</del></strong>b</p>
+
+<p>b_<del>a</del>_b</p>
+
+<p>b_<del>a</del>_b</p>
+
+<p>b__<del>a</del>__b</p>
+
+<p>b__<del>a</del>__b</p>
diff --git a/test/specs/new/strikethrough_in_em_strong.md b/test/specs/new/strikethrough_in_em_strong.md
@@ -13,3 +13,35 @@ _~~a~~_b
 __~a~__b
 
 __~~a~~__b
+
+b*~a~*
+
+b*~~a~~*
+
+b**~a~**
+
+b**~~a~~**
+
+b_~a~_
+
+b_~~a~~_
+
+b__~a~__
+
+b__~~a~~__
+
+b*~a~*b
+
+b*~~a~~*b
+
+b**~a~**b
+
+b**~~a~~**b
+
+b_~a~_b
+
+b_~~a~~_b
+
+b__~a~__b
+
+b__~~a~~__b
