private PsiReference[] collectRefs(@NotNull PsiElement element, String value, int startInElement) {
    final int atSignIndex = value.indexOf('@');
    if (atSignIndex >= 0 && (atSignIndex == 0 || StringUtil.trimLeading(value).startsWith("@"))) {
      value = value.substring(atSignIndex + 1);
      startInElement += atSignIndex + 1;
    }
    final FileReferenceSet set = new FileReferenceSet(value, element, startInElement, null, true) {
      @Override
      protected Condition<PsiFileSystemItem> getReferenceCompletionFilter() {
        return item -> {
          if (item instanceof PsiDirectory) return true;
          final VirtualFile virtualFile = item.getVirtualFile();
          if (virtualFile == null) return false;
          return myAcceptedFileTypes.contains(virtualFile.getExtension());
        };
      }
    };
    if (value.startsWith("/")) {
      set.addCustomization(FileReferenceSet.DEFAULT_PATH_EVALUATOR_OPTION, FileReferenceSet.ABSOLUTE_TOP_LEVEL);
    }
    return set.getAllReferences();
  }
private PsiReference[] collectRefs(@NotNull PsiElement element, String value, int startInElement)