@Nullable
  @Override
  protected LocalQuickFix buildFix(Object... infos) {
    final PsiExpression expression = (PsiExpression)infos[1];
    if (!(expression instanceof PsiLiteralExpression)) {
      return null;
    }
    return new EscapeCharacterFix();
  }
@Nullable
  @Override
  protected LocalQuickFix buildFix(Object... infos)