Update MD051/link-fragments to ignore HTML comments embedded in heading text.

demo/markdownlint-browser.js

@@ -4610,7 +4610,10 @@ const identifierRe = /(?:id|name)\s*=\s*['"]?([^'"\s>]+)/iu;
  * @returns {string} Fragment string for heading.
  */
 function convertHeadingToHTMLFragment(inline) {
-    const inlineText = inline.children.map((token) => token.content).join("");
+    const inlineText = inline.children
+        .filter((token) => token.type !== "html_inline")
+        .map((token) => token.content)
+        .join("");
     return "#" + encodeURIComponent(inlineText
         .toLowerCase()
         // RegExp source with Ruby's \p{Word} expanded into its General Categories
@@ -4663,7 +4666,7 @@ module.exports = {
                     context = match[0];
                     range = [match.index + 1, match[0].length];
                 }
-                addError(onError, lineNumber, null, context, range);
+                addError(onError, lineNumber, undefined, context, range);
             }
         });
     }

lib/md051.js

@@ -16,7 +16,10 @@ const identifierRe = /(?:id|name)\s*=\s*['"]?([^'"\s>]+)/iu;
  * @returns {string} Fragment string for heading.
  */
 function convertHeadingToHTMLFragment(inline) {
-  const inlineText = inline.children.map((token) => token.content).join("");
+  const inlineText = inline.children
+    .filter((token) => token.type !== "html_inline")
+    .map((token) => token.content)
+    .join("");
   return "#" + encodeURIComponent(
     inlineText
       .toLowerCase()
@@ -77,7 +80,7 @@ module.exports = {
           context = match[0];
           range = [ match.index + 1, match[0].length ];
         }
-        addError(onError, lineNumber, null, context, range);
+        addError(onError, lineNumber, undefined, context, range);
       }
     });
   }

test/link-fragments.md

@@ -32,6 +32,12 @@
 
 [Valid](#valid-repeated-heading-2)
 
+[Valid](#valid-heading-with-trailing-space-)
+
+[Valid](#valid-heading-with-two-trailing-spaces--)
+
+[Valid](#valid-heading-with-embedded--comment)
+
 [Valid](#namedlink)
 
 [Valid](#idlink)
@@ -93,6 +99,12 @@ Text
 
 ### Valid Repeated Heading
 
+### Valid Heading With Trailing Space <!-- comment -->
+
+### Valid Heading With Two Trailing Spaces  <!-- comment -->
+
+### Valid Heading With Embedded <!-- comment --> Comment
+
 <a name="namedlink"></a>
 
 <a id = idlink></a>

test/snapshots/markdownlint-test-scenarios.js.md

@@ -20950,7 +20950,7 @@ Generated by [AVA](https://avajs.dev).
             31,
           ],
           fixInfo: null,
-          lineNumber: 108,
+          lineNumber: 120,
           ruleDescription: 'Link fragments should be valid',
           ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md051',
           ruleNames: [
@@ -20966,7 +20966,7 @@ Generated by [AVA](https://avajs.dev).
             36,
           ],
           fixInfo: null,
-          lineNumber: 110,
+          lineNumber: 122,
           ruleDescription: 'Link fragments should be valid',
           ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md051',
           ruleNames: [
@@ -20982,7 +20982,7 @@ Generated by [AVA](https://avajs.dev).
             28,
           ],
           fixInfo: null,
-          lineNumber: 112,
+          lineNumber: 124,
           ruleDescription: 'Link fragments should be valid',
           ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md051',
           ruleNames: [
@@ -20998,7 +20998,7 @@ Generated by [AVA](https://avajs.dev).
             18,
           ],
           fixInfo: null,
-          lineNumber: 114,
+          lineNumber: 126,
           ruleDescription: 'Link fragments should be valid',
           ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md051',
           ruleNames: [
@@ -21014,7 +21014,7 @@ Generated by [AVA](https://avajs.dev).
             21,
           ],
           fixInfo: null,
-          lineNumber: 116,
+          lineNumber: 128,
           ruleDescription: 'Link fragments should be valid',
           ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md051',
           ruleNames: [
@@ -21027,7 +21027,7 @@ Generated by [AVA](https://avajs.dev).
           errorDetail: null,
           errorRange: null,
           fixInfo: null,
-          lineNumber: 118,
+          lineNumber: 130,
           ruleDescription: 'Link fragments should be valid',
           ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/Rules.md#md051',
           ruleNames: [
@@ -21070,6 +21070,12 @@ Generated by [AVA](https://avajs.dev).
       ␊
       [Valid](#valid-repeated-heading-2)␊
       ␊
+      [Valid](#valid-heading-with-trailing-space-)␊
+      ␊
+      [Valid](#valid-heading-with-two-trailing-spaces--)␊
+      ␊
+      [Valid](#valid-heading-with-embedded--comment)␊
+      ␊
       [Valid](#namedlink)␊
       ␊
       [Valid](#idlink)␊
@@ -21131,6 +21137,12 @@ Generated by [AVA](https://avajs.dev).
       ␊
       ### Valid Repeated Heading␊
       ␊
+      ### Valid Heading With Trailing Space <!-- comment -->␊
+      ␊
+      ### Valid Heading With Two Trailing Spaces  <!-- comment -->␊
+      ␊
+      ### Valid Heading With Embedded <!-- comment --> Comment␊
+      ␊
       <a name="namedlink"></a>␊
       ␊
       <a id = idlink></a>␊