Function walkIcuTree

packages/core/src/render3/i18n/i18n_parse.ts:787–929

(
  ast: I18nNode[],
  tView: TView,
  tIcu: TIcu,
  lView: LView,
  sharedUpdateOpCodes: I18nUpdateOpCodes,
  create: IcuCreateOpCodes,
  remove: I18nRemoveOpCodes,
  update: I18nUpdateOpCodes,
  parentNode: Element,
  parentIdx: number,
  nestedIcus: IcuExpression[],
  depth: number,
)

}

function walkIcuTree(
  ast: I18nNode[],
  tView: TView,
  tIcu: TIcu,
  lView: LView,
  sharedUpdateOpCodes: I18nUpdateOpCodes,
  create: IcuCreateOpCodes,
  remove: I18nRemoveOpCodes,
  update: I18nUpdateOpCodes,
  parentNode: Element,
  parentIdx: number,
  nestedIcus: IcuExpression[],
  depth: number,
): number {
  let bindingMask = 0;
  let currentNode = parentNode.firstChild;
  while (currentNode) {
    const newIndex = allocExpando(tView, lView, 1, null);
    switch (currentNode.nodeType) {
      case Node.ELEMENT_NODE:
        const element = currentNode as Element;
        const tagName = element.tagName.toLowerCase();
        if (VALID_ELEMENTS.hasOwnProperty(tagName)) {
          addCreateNodeAndAppend(create, ELEMENT_MARKER, tagName, parentIdx, newIndex);
          tView.data[newIndex] = tagName;
          const elAttrs = element.attributes;
          for (let i = 0; i < elAttrs.length; i++) {
            const attr = elAttrs.item(i)!;
            const lowerAttrName = attr.name.toLowerCase();
            const hasBinding = !!attr.value.match(BINDING_REGEXP);
            const elementNS = element.namespaceURI;
            const tagNameWithNamespace =
              elementNS === 'http://www.w3.org/2000/svg'
                ? `:svg:${tagName}`
                : elementNS === 'http://www.w3.org/1998/Math/MathML'
                  ? `:math:${tagName}`
                  : tagName;
            if (hasBinding) {
              if (VALID_ATTRS.hasOwnProperty(lowerAttrName)) {
                generateBindingUpdateOpCodes(
                  update,
                  attr.value,
                  newIndex,
                  attr.name,
                  0,
                  i18nResolveSanitizer(lowerAttrName, tagNameWithNamespace),
                );
              } else {
                ngDevMode &&
                  console.warn(
                    `WARNING: ignoring unsafe attribute value ` +
                      `${lowerAttrName} on element ${tagName} ` +
                      `(see ${XSS_SECURITY_URL})`,
                  );
              }
            } else if (VALID_ATTRS[lowerAttrName]) {
              let val = attr.value;
              const sanitizer = i18nResolveSanitizer(lowerAttrName, tagNameWithNamespace);