can't type newlines when `nextEmbedded` is set

[Yokozuna59]

Hi there, in my Monarch syntax highlighter, I have a rule where it uses embedded language:

initial: [
  [
    /^\s*%%(?={)/,
    { token: 'keyword', bracket: '@open', next: '@directive', nextEmbedded: 'javascript' },
  ],
  // other rules
]

When I enter that state, I can type anything, except newlines. And when I removed javascript and made it empty, it worked fine but without the language features. I tried the code in https://microsoft.github.io/monaco-editor/monarch.html to check if the issue was in my code, but it's working fine.

Here's the minimum Monarch code:

export default {
  tokenizer: {
    initial: [
      [
        /^\s*%%(?={)/,
        { token: 'keyword', bracket: '@open', next: '@directive', nextEmbedded: 'javascript' },
      ],
    ],
    directive: [
      [/%%$/, { token: 'keyword', bracket: '@close', next: '@pop', nextEmbedded: '@pop' }],
    ],
  },
};

[kaisalmen]

Hi @Yokozuna59 could you please share your initialization code (UserConfig)? What editor type do you use?

[Yokozuna59]

Hi @kaisalmen, I don't have one; it was the generated editor by generator-langium@2.0.0. I'm not sure if it was resolved with the latest version. I tried updating the version, but errors were thrown everywhere, so I stuck with the version that came with generator-langium. I saw that you plan to update the browser template at https://github.com/eclipse-langium/langium/issues/1163, but I'm not sure when it will happen, so I continued working with the version I have.

[kaisalmen]

@Yokozuna59 yes, the generator needs to be updated. Hopefully, we achieve that before Langium 2.1.0 is released. Anyway, this seems like a bug and should be verified to work or not with the current version. Thanks for reporting.

[Yokozuna59]

@kaisalmen I'm not entirely sure about monarch grammar, but the issue didn't occur after updating the editor and migrated to TextMate. Thanks for your help! I'll mark the issue as resolved.