Class TokenListObserver

src/mutation-observers/token_list_observer.ts:16–108

}

export class TokenListObserver implements AttributeObserverDelegate {
  private attributeObserver: AttributeObserver
  private delegate: TokenListObserverDelegate
  private tokensByElement: Multimap<Element, Token>

  constructor(element: Element, attributeName: string, delegate: TokenListObserverDelegate) {
    this.attributeObserver = new AttributeObserver(element, attributeName, this)
    this.delegate = delegate
    this.tokensByElement = new Multimap()
  }

  get started(): boolean {
    return this.attributeObserver.started
  }

  start() {
    this.attributeObserver.start()
  }

  pause(callback: () => void) {
    this.attributeObserver.pause(callback)
  }

  stop() {
    this.attributeObserver.stop()
  }

  refresh() {
    this.attributeObserver.refresh()
  }

  get element(): Element {
    return this.attributeObserver.element
  }

  get attributeName(): string {
    return this.attributeObserver.attributeName
  }

  // Attribute observer delegate

  elementMatchedAttribute(element: Element) {
    this.tokensMatched(this.readTokensForElement(element))
  }

  elementAttributeValueChanged(element: Element) {
    const [unmatchedTokens, matchedTokens] = this.refreshTokensForElement(element)
    this.tokensUnmatched(unmatchedTokens)
    this.tokensMatched(matchedTokens)
  }

  elementUnmatchedAttribute(element: Element) {
    this.tokensUnmatched(this.tokensByElement.getValuesForKey(element))
  }

  private tokensMatched(tokens: Token[]) {
    tokens.forEach((token) => this.tokenMatched(token))
  }