Function clampDurations

packages/core/src/compiler/timingCompiler.ts:267–285

(html: string, clamps: ResolvedDuration[])

 * and recomputes data-end accordingly.
 */
export function clampDurations(html: string, clamps: ResolvedDuration[]): string {
  for (const { id, duration } of clamps) {
    const idPattern = new RegExp(`(<[^>]*id=["']${escapeRegex(id)}["'][^>]*>)`, "gi");

    html = html.replace(idPattern, (tag) => {
      // Replace data-duration value
      tag = tag.replace(/data-duration=["'][^"']*["']/, `data-duration="${duration}"`);

      // Recompute data-end from data-start + clamped duration
      const startStr = getAttr(tag, "data-start");
      const start = startStr ? parseFloat(startStr) : 0;
      tag = tag.replace(/data-end=["'][^"']*["']/, `data-end="${start + duration}"`);

      return tag;
    });
  }

  return html;
}