Function parseIcuCase

packages/core/src/render3/i18n/i18n_parse.ts:741–787

* Parses a node, its children and its siblings, and generates the mutate & update OpCodes. *

(
  ast: I18nNode[],
  tView: TView,
  tIcu: TIcu,
  lView: LView,
  updateOpCodes: I18nUpdateOpCodes,
  parentIdx: number,
  caseName: string,
  unsafeCaseHtml: string,
  nestedIcus: IcuExpression[],
)

 *
 */
function parseIcuCase(
  ast: I18nNode[],
  tView: TView,
  tIcu: TIcu,
  lView: LView,
  updateOpCodes: I18nUpdateOpCodes,
  parentIdx: number,
  caseName: string,
  unsafeCaseHtml: string,
  nestedIcus: IcuExpression[],
): number {
  const create: IcuCreateOpCodes = [] as any;
  const remove: I18nRemoveOpCodes = [] as any;
  const update: I18nUpdateOpCodes = [] as any;
  if (ngDevMode) {
    attachDebugGetter(create, icuCreateOpCodesToString);
    attachDebugGetter(remove, i18nRemoveOpCodesToString);
    attachDebugGetter(update, i18nUpdateOpCodesToString);
  }
  tIcu.cases.push(caseName);
  tIcu.create.push(create);
  tIcu.remove.push(remove);
  tIcu.update.push(update);

  const inertBodyHelper = getInertBodyHelper(getDocument());
  const inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeCaseHtml);
  ngDevMode && assertDefined(inertBodyElement, 'Unable to generate inert body element');
  const inertRootNode = (getTemplateContent(inertBodyElement!) as Element) || inertBodyElement;
  if (inertRootNode) {
    return walkIcuTree(
      ast,
      tView,
      tIcu,
      lView,
      updateOpCodes,
      create,
      remove,
      update,
      inertRootNode,
      parentIdx,
      nestedIcus,
      0,
    );
  } else {
    return 0;
  }
}

function walkIcuTree(
  ast: I18nNode[],