UsingDeclarationsSorter.cpp

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//===--- UsingDeclarationsSorter.cpp ----------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements UsingDeclarationsSorter, a TokenAnalyzer that
/// sorts consecutive using declarations.
///
//===----------------------------------------------------------------------===//
 
#include "UsingDeclarationsSorter.h"
#include "clang/Format/Format.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Regex.h"
 
#include <algorithm>
 
#define DEBUG_TYPE "using-declarations-sorter"
 
namespace clang {
namespace format {
 
namespace {
 
// The order of using declaration is defined as follows:
// Split the strings by "::" and discard any initial empty strings. The last
// element of each list is a non-namespace name; all others are namespace
// names. Sort the lists of names lexicographically, where the sort order of
// individual names is that all non-namespace names come before all namespace
// names, and within those groups, names are in case-insensitive lexicographic
// order.
int compareLabelsLexicographicNumeric(StringRef A, StringRef B) {
  SmallVector<StringRef, 2> NamesA;
  A.split(NamesA, "::", /*MaxSplit=*/-1, /*KeepEmpty=*/false);