Function serializeI18nNode

packages/core/src/hydration/i18n.ts:251–290

* Process the given i18n node for serialization. * Returns the first RNode for the i18n node to begin hydration.

(
  lView: LView,
  serializedI18nBlock: SerializedI18nBlock,
  context: HydrationContext,
  node: I18nNode,
)

 * Returns the first RNode for the i18n node to begin hydration.
 */
function serializeI18nNode(
  lView: LView,
  serializedI18nBlock: SerializedI18nBlock,
  context: HydrationContext,
  node: I18nNode,
): Node | null {
  const maybeRNode = unwrapRNode(lView[node.index]!);
  if (!maybeRNode || isDisconnectedRNode(maybeRNode)) {
    serializedI18nBlock.disconnectedNodes.add(node.index - HEADER_OFFSET);
    return null;
  }

  const rNode = maybeRNode as Node;
  switch (node.kind) {
    case I18nNodeKind.TEXT: {
      processTextNodeBeforeSerialization(context, rNode);
      break;
    }

    case I18nNodeKind.ELEMENT:
    case I18nNodeKind.PLACEHOLDER: {
      serializeI18nBlock(lView, serializedI18nBlock, context, node.children);
      break;
    }

    case I18nNodeKind.ICU: {
      const currentCase = lView[node.currentCaseLViewIndex] as number | null;
      if (currentCase != null) {
        // i18n uses a negative value to signal a change to a new case, so we
        // need to invert it to get the proper value.
        const caseIdx = currentCase < 0 ? ~currentCase : currentCase;
        serializedI18nBlock.caseQueue.push(caseIdx);
        serializeI18nBlock(lView, serializedI18nBlock, context, node.cases[caseIdx]);
      }
      break;
    }
  }

  return getFirstNativeNodeForI18nNode(lView, node) as Node | null;
}

/**
 * Helper function to get the first native node to begin hydrating