algorithm.ts

import {
  JupyterFrontEnd,
  JupyterFrontEndPlugin
} from '@jupyterlab/application';

import {
  IEditorLanguageRegistry
} from '@jupyterlab/codemirror'
import { LanguageSupport, LRLanguage } from '@codemirror/language';

import { buildParser } from '@lezer/generator';

/**
 * Initialization data for the unicodelab-ts extension.
 */
export const algorithm_plugin: JupyterFrontEndPlugin<void> = {
  id: 'unicodelab-ts:algorithm',
  autoStart: true,
  // provides: snippetToken, // For providing services
  requires: [IEditorLanguageRegistry],
  optional: [],
  activate: (
    app: JupyterFrontEnd,
    lang_registry: IEditorLanguageRegistry
  ) => {

    lang_registry.addLanguage({
      name: 'algorithm',
      mime: 'text/algorithm',
      support: new LanguageSupport(
        // dummy parser that accepts nothing
        LRLanguage.define({
          parser: buildParser(`
@top Program { word word* ";" }

@tokens {
  spaces[@export] { $[\u0009 \u000b\u00a0\u1680\u2000-\u200a\u202f\u205f\u3000\ufeff]+ }
  newline[@export] { $[\r\n\u2028\u2029] }

  wordLetter { @asciiLetter }

  word { wordLetter+ }

  @precedence { spaces, newline, word }

  ";"
}

@external propSource algorithmHighlight from "./highlight.ts"
`)
        })
      )
    });
  }
};