Function icuStart

packages/core/src/render3/i18n/i18n_parse.ts:571–632

* Generate the OpCodes for ICU expressions. * * @param icuExpression * @param index Index where the anchor is stored and an optional `TIcuContainerNode` * - `lView[anchorIdx]` points to a `Comment` node representing the anchor for the ICU. * - `tView.data[anchorIdx]` points to the `TIcuCont

(
  ast: I18nNode[],
  tView: TView,
  lView: LView,
  updateOpCodes: I18nUpdateOpCodes,
  parentIdx: number,
  icuExpression: IcuExpression,
  anchorIdx: number,
)

 *   - `tView.data[anchorIdx]` points to the `TIcuContainerNode` if ICU is root (`null` otherwise)
 */
function icuStart(
  ast: I18nNode[],
  tView: TView,
  lView: LView,
  updateOpCodes: I18nUpdateOpCodes,
  parentIdx: number,
  icuExpression: IcuExpression,
  anchorIdx: number,
) {
  ngDevMode && assertDefined(icuExpression, 'ICU expression must be defined');
  let bindingMask = 0;
  const tIcu: TIcu = {
    type: icuExpression.type,
    currentCaseLViewIndex: allocExpando(tView, lView, 1, null),
    anchorIdx,
    cases: [],
    create: [],
    remove: [],
    update: [],
  };
  addUpdateIcuSwitch(updateOpCodes, icuExpression, anchorIdx);
  setTIcu(tView, anchorIdx, tIcu);
  const values = icuExpression.values;
  const cases: I18nNode[][] = [];
  for (let i = 0; i < values.length; i++) {
    // Each value is an array of strings & other ICU expressions
    const valueArr = values[i];
    const nestedIcus: IcuExpression[] = [];
    for (let j = 0; j < valueArr.length; j++) {
      const value = valueArr[j];
      if (typeof value !== 'string') {
        // It is an nested ICU expression
        const icuIndex = nestedIcus.push(value as IcuExpression) - 1;
        // Replace nested ICU expression by a comment node
        valueArr[j] = `<!--�${icuIndex}�-->`;
      }
    }
    const caseAst: I18nNode[] = [];
    cases.push(caseAst);
    bindingMask =
      parseIcuCase(
        caseAst,
        tView,
        tIcu,
        lView,
        updateOpCodes,
        parentIdx,
        icuExpression.cases[i],
        valueArr.join(''),
        nestedIcus,
      ) | bindingMask;
  }
  if (bindingMask) {
    addUpdateIcuUpdate(updateOpCodes, bindingMask, anchorIdx);
  }
  ast.push({
    kind: I18nNodeKind.ICU,
    index: anchorIdx,