Parse the two hyphens in the HTML comment as one hyphen

[ota-meshi]

I would like to be able to accept directive comment descriptions in eslint-plugin-vue.
However, the comment value did not produce the expected result.

The following HTML comment is parsed as follows:

<template>
  <!-- eslint-disable -- description -->
</template>

[
  {
    "type": "HTMLComment",
    "range": [ /* ...  */ ],
    "loc": { /* ...  */ },
    "value": " eslint-disable - description "
  }
]

I expect the following results.

[
  {
    "type": "HTMLComment",
    "range": [ /* ...  */ ],
    "loc": { /* ...  */ },
-    "value": " eslint-disable - description "
+    "value": " eslint-disable -- description "
  }
]

---

I've heard that the old HTML specification should avoid consecutive hyphens.
Do you think you should avoid separating the description with two hyphens?

[mysticatea]

Thank you for your report.

It looks like a bug.

The HTML comment parsing is defined in https://html.spec.whatwg.org/multipage/parsing.html, from the section 12.2.5.43 to 12.2.5.52. It's complex a bit.

"Comment state" -> "Comment end dash state" -> "Comment end state", then it says "Append two U+002D HYPHEN-MINUS characters (-) to the comment token's data.", but the tokenizer appends only one hypen.

[ota-meshi]

Thank you for your comment!
I have opened a PR to fix this.