Class AttributeIteratorImpl

xml/_parser.ts:55–120

* Reusable attribute iterator implementation. * * This class reuses internal arrays across elements to avoid allocations. * The iterator is valid only until the next element is processed.

 * The iterator is valid only until the next element is processed.
 */
class AttributeIteratorImpl implements XmlAttributeIterator {
  #names: string[] = [];
  #values: string[] = [];
  #colonIndices: number[] = [];
  #uris: (string | undefined)[] = [];
  #count = 0;
  #nameSet: Set<string> | null = null;

  get count(): number {
    return this.#count;
  }

  getName(index: number): string {
    return this.#names[index]!;
  }

  getValue(index: number): string {
    return this.#values[index]!;
  }

  getColonIndex(index: number): number {
    return this.#colonIndices[index]!;
  }

  getUri(index: number): string | undefined {
    return this.#uris[index];
  }

  /** @internal Reset the iterator for a new element. */
  _reset(): void {
    this.#count = 0;
    this.#nameSet = null;
  }

  /** @internal Add an attribute (name already decoded, value raw). */
  _add(name: string, value: string, xml11: boolean): void {
    this.#names[this.#count] = name;
    this.#values[this.#count] = normalizeAttributeValue(value, xml11);
    this.#colonIndices[this.#count] = name.indexOf(":");
    this.#uris[this.#count] = undefined;
    this.#nameSet?.add(name);
    this.#count++;
  }

  /** @internal Set the URI for an attribute at the given index. */
  _setUri(index: number, uri: string | undefined): void {
    this.#uris[index] = uri;
  }

  /** @internal Check if an attribute with this name already exists. */
  _has(name: string): boolean {
    if (this.#count < ATTR_SET_THRESHOLD) {
      for (let i = 0; i < this.#count; i++) {
        if (this.#names[i] === name) return true;
      }
      return false;
    }
    if (!this.#nameSet) {