Fix handling of maxNesting errors in block parser

lib/parser_block.js

@@ -59,23 +59,32 @@ ParserBlock.prototype.tokenize = function (state, startLine, endLine) {
     // Nested calls currently used for blockquotes & lists
     if (state.tShift[line] < state.blkIndent) { break; }
 
-    // If nesting level exceeded - skip tail to the end. That's not ordinary
-    // situation and we should not care about content.
-    if (state.level >= maxNesting) {
-      state.line = endLine;
-      break;
-    }
-
     // Try all possible rules.
     // On success, rule should:
     //
     // - update `state.line`
     // - update `state.tokens`
     // - return true
 
-    for (i = 0; i < len; i++) {
-      ok = rules[i](state, line, endLine, false);
-      if (ok) { break; }
+    if (state.level >= maxNesting) {
+      // In case maxNesting is reached, output the rest of the lines
+      // as plain inline tokens one by one.
+      state.tokens.push({
+        type: 'inline',
+        content: state.src.slice(
+                   state.bMarks[state.line] + state.tShift[state.line],
+                   state.eMarks[state.line]
+                 ).trim(),
+        level: state.level,
+        lines: [ state.line, state.line ],
+        children: []
+      });
+      state.line++;
+    } else {
+      for (i = 0; i < len; i++) {
+        ok = rules[i](state, line, endLine, false);
+        if (ok) { break; }
+      }
     }
 
     // set state.tight iff we had an empty line before current tag

test/misc.js

@@ -244,7 +244,7 @@ describe('maxNesting', function () {
     var md = markdownit({ maxNesting: 2 });
     assert.strictEqual(
       md.render('>foo\n>>bar\n>>>baz'),
-      '<blockquote>\n<p>foo</p>\n<blockquote>\n</blockquote>\n</blockquote>\n'
+      '<blockquote>\n<p>foo</p>\n<blockquote>\nbar&gt;baz</blockquote>\n</blockquote>\n'
     );
   });