Function applyCreateOpCodes

packages/core/src/render3/i18n/i18n_apply.ts:204–235

(
  lView: LView,
  createOpCodes: I18nCreateOpCodes,
  parentRNode: RElement | null,
  insertInFrontOf: RElement | null,
)

 * @param insertInFrontOf DOM node that should be used as an anchor.
 */
export function applyCreateOpCodes(
  lView: LView,
  createOpCodes: I18nCreateOpCodes,
  parentRNode: RElement | null,
  insertInFrontOf: RElement | null,
): void {
  const renderer = lView[RENDERER];
  for (let i = 0; i < createOpCodes.length; i++) {
    const opCode = createOpCodes[i++] as any;
    const text = createOpCodes[i] as string;
    const isComment = (opCode & I18nCreateOpCode.COMMENT) === I18nCreateOpCode.COMMENT;
    const appendNow =
      (opCode & I18nCreateOpCode.APPEND_EAGERLY) === I18nCreateOpCode.APPEND_EAGERLY;
    const index = opCode >>> I18nCreateOpCode.SHIFT;
    let rNode = lView[index];
    let lastNodeWasCreated = false;
    if (rNode === null) {
      // We only create new DOM nodes if they don't already exist: If ICU switches case back to a
      // case which was already instantiated, no need to create new DOM nodes.
      rNode = lView[index] = _locateOrCreateNode(
        lView,
        index,
        text,
        isComment ? Node.COMMENT_NODE : Node.TEXT_NODE,
      );
      lastNodeWasCreated = wasLastNodeCreated();
    }
    if (appendNow && parentRNode !== null && lastNodeWasCreated) {
      nativeInsertBefore(renderer, parentRNode, rNode, insertInFrontOf, false);
    }
  }
}

/**
 * Apply `I18nMutateOpCodes` OpCodes.