Function set

packages/lang-core/src/parser/parser.ts:617–624

(fullText)

      return currentResult();
    },
    set(fullText) {
      if (fullText.length < buf.length || !fullText.startsWith(buf)) {
        reset();
      }
      const delta = fullText.slice(buf.length);
      if (delta) buf += delta;
      return currentResult();
    },
    getResult: currentResult,
  };
}