Function autoCloseFragment

src/patch-streaming-html.ts:875–900

(fragment: string)

}

function autoCloseFragment(fragment: string): string {
  const openTags: string[] = [];
  const tagRe = /<\/?([a-zA-Z][a-zA-Z0-9-]*)\b[^>]*(\/)?>/g;
  let match: RegExpExecArray | null;

  while ((match = tagRe.exec(fragment)) !== null) {
    const tag = match[1]!.toLowerCase();
    const isClose = match[0]![1] === "/";
    const isSelfClose = Boolean(match[2]) || match[0]!.endsWith("/>");

    if (isClose) {
      const idx = openTags.lastIndexOf(tag);
      if (idx !== -1) {
        openTags.splice(idx);
      }
    } else if (!isSelfClose) {
      openTags.push(tag);
    }
  }

  let result = fragment;
  for (let i = openTags.length - 1; i >= 0; i--) {
    result += `</${openTags[i]}>`;
  }
  return result;
}

/** Remove every streaming caret under `container` (open-tag stack moves leave orphans). */
export function removeStreamingCarets(container: HTMLElement): void {