Patch showdown for span nesting limit Closes #2722 #2714

3da79ebcff065eccc3ccc10cb9e447762268cf33

Cohee <18619528+Cohee1207@users.noreply.github.com>

public/index.html+1 -0 Viewed

     <script src="lib/jquery-cookie-1.4.1.min.js"></script>
     <script src="lib/jquery.ui.touch-punch.min.js"></script>
     <script src="lib/showdown.min.js"></script>
 +    <script src="lib/showdown-patch.js"></script>
     <script src="lib/showdown-katex.min.js"></script>
     <script src="lib/popper.js"></script>
     <script src="lib/purify.min.js"></script>

public/lib/showdown-patch.js+24 -0 Viewed

 +showdown.subParser('makehtml.unhashHTMLSpans', function (text, options, globals) {
 +    'use strict';
 +    text = globals.converter._dispatch('makehtml.unhashHTMLSpans.before', text, options, globals).getText();
++
 +    for (var i = 0; i < globals.gHtmlSpans.length; ++i) {
 +        var repText = globals.gHtmlSpans[i],
 +            // limiter to prevent infinite loop (assume 10 as limit for recurse)
 +            limit = 0;
++
 +        while (/¨C(\d+)C/.test(repText)) {
 +            var num = RegExp.$1;
 +            repText = repText.replace('¨C' + num + 'C', globals.gHtmlSpans[num]);
 +            if (limit === 10000) {
 +                console.error('maximum nesting of 10000 spans reached!!!');
 +                break;
 +            }
 +            ++limit;
 +        }
 +        text = text.replace('¨C' + i + 'C', repText);
 +    }
++
 +    text = globals.converter._dispatch('makehtml.unhashHTMLSpans.after', text, options, globals).getText();
 +    return text;
 +});