Function collectI18nChildren

packages/core/src/hydration/i18n.ts:95–135

(tView: TView)

}

function collectI18nChildren(tView: TView): Set<number> | null {
  const children = new Set<number>();

  function collectI18nViews(node: I18nNode) {
    children.add(node.index);

    switch (node.kind) {
      case I18nNodeKind.ELEMENT:
      case I18nNodeKind.PLACEHOLDER: {
        for (const childNode of node.children) {
          collectI18nViews(childNode);
        }
        break;
      }

      case I18nNodeKind.ICU: {
        for (const caseNodes of node.cases) {
          for (const caseNode of caseNodes) {
            collectI18nViews(caseNode);
          }
        }
        break;
      }
    }
  }

  // Traverse through the AST of each i18n block in the LView,
  // and collect every instruction index.
  for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {
    const tI18n = tView.data[i] as TI18n | undefined;
    if (!tI18n || !tI18n.ast) {
      continue;
    }

    for (const node of tI18n.ast) {
      collectI18nViews(node);
    }
  }

  return children.size === 0 ? null : children;
}

/**
 * Resulting data from serializing an i18n block.