Function tokenizeKeySequence

test/testSimplifier.ts:157–203

* Tokenize a string like `"abc d "` into `["a", "b", "c", " ", "d", " "]`

(sequence: string)

 * Tokenize a string like `"abc<Esc>d<C-c>"` into `["a", "b", "c", "<Esc>", "d", "<C-c>"]`
 */
function tokenizeKeySequence(sequence: string): string[] {
  let isBracketedKey = false;
  let key = '';
  const result: string[] = [];

  // no close bracket, probably trying to do a left shift, take literal
  // char sequence
  const rawTokenize = (characters: string): void => {
    for (const c of characters) {
      result.push(c);
    }
  };

  // don't use a for of here, since the iterator doesn't split surrogate pairs
  // eslint-disable-next-line @typescript-eslint/prefer-for-of
  for (let i = 0; i < sequence.length; i++) {
    const char = sequence[i];

    key += char;

    if (char === '<') {
      if (isBracketedKey) {
        rawTokenize(key.slice(0, key.length - 1));
        key = '<';
      } else {
        isBracketedKey = true;
      }
    }

    if (char === '>') {
      isBracketedKey = false;
    }

    if (isBracketedKey) {
      continue;
    }

    result.push(key);
    key = '';
  }

  if (isBracketedKey) {
    rawTokenize(key);
  }

  return result;
}

async function applyDocState(editor: vscode.TextEditor, docState: DocState): Promise<void> {
  assert.ok(