Method _scopeAnimationKeyframe

packages/compiler/src/shadow_css.ts:317–328

* Function used to scope a keyframes name (obtained from an animation declaration) * using an existing set of unscopedKeyframes names to discern if the scoping needs to be * performed (keyframes names of keyframes not defined in the component's css need not to be * scoped). * * @param

(
    keyframe: string,
    scopeSelector: string,
    unscopedKeyframesSet: ReadonlySet<string>,
  )

   * scoped.
   */
  private _scopeAnimationKeyframe(
    keyframe: string,
    scopeSelector: string,
    unscopedKeyframesSet: ReadonlySet<string>,
  ): string {
    return keyframe.replace(/^(\s*)(['"]?)(.+?)\2(\s*)$/, (_, spaces1, quote, name, spaces2) => {
      name = `${
        unscopedKeyframesSet.has(unescapeQuotes(name, quote)) ? scopeSelector + '_' : ''
      }${name}`;
      return `${spaces1}${quote}${name}${quote}${spaces2}`;
    });
  }

  /**
   * Regular expression used to extrapolate the possible keyframes from an