Export clang-format16 via ydblib project

6e6be3a95868fde888d801b7590af4044049563f

1 files changed, 99 insertions, 0 deletions

diff --git a/contrib/libs/clang16/include/clang/Tooling/FileMatchTrie.h b/contrib/libs/clang16/include/clang/Tooling/FileMatchTrie.h
new file mode 100644
index 0000000000..6f6b9effeb
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+++ b/contrib/libs/clang16/include/clang/Tooling/FileMatchTrie.h
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+#pragma once
+
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+//===- FileMatchTrie.h ------------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements a match trie to find the matching file in a compilation
+//  database based on a given path in the presence of symlinks.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLING_FILEMATCHTRIE_H
+#define LLVM_CLANG_TOOLING_FILEMATCHTRIE_H
+
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/StringRef.h"
+#include <memory>
+
+namespace clang {
+namespace tooling {
+
+class FileMatchTrieNode;
+
+struct PathComparator {
+  virtual ~PathComparator() = default;
+
+  virtual bool equivalent(StringRef FileA, StringRef FileB) const = 0;
+};
+
+/// A trie to efficiently match against the entries of the compilation
+/// database in order of matching suffix length.
+///
+/// When a clang tool is supposed to operate on a specific file, we have to
+/// find the corresponding file in the compilation database. Although entries
+/// in the compilation database are keyed by filename, a simple string match
+/// is insufficient because of symlinks. Commonly, a project hierarchy looks
+/// like this:
+///   /<project-root>/src/<path>/<somefile>.cc      (used as input for the tool)
+///   /<project-root>/build/<symlink-to-src>/<path>/<somefile>.cc (stored in DB)
+///
+/// Furthermore, there might be symlinks inside the source folder or inside the
+/// database, so that the same source file is translated with different build
+/// options.
+///
+/// For a given input file, the \c FileMatchTrie finds its entries in order
+/// of matching suffix length. For each suffix length, there might be one or
+/// more entries in the database. For each of those entries, it calls
+/// \c llvm::sys::fs::equivalent() (injected as \c PathComparator). There might
+/// be zero or more entries with the same matching suffix length that are
+/// equivalent to the input file. Three cases are distinguished:
+/// 0  equivalent files: Continue with the next suffix length.
+/// 1  equivalent file:  Best match found, return it.
+/// >1 equivalent files: Match is ambiguous, return error.
+class FileMatchTrie {
+public:
+  FileMatchTrie();
+
+  /// Construct a new \c FileMatchTrie with the given \c PathComparator.
+  ///
+  /// The \c FileMatchTrie takes ownership of 'Comparator'. Used for testing.
+  FileMatchTrie(PathComparator* Comparator);
+
+  ~FileMatchTrie();
+
+  /// Insert a new absolute path. Relative paths are ignored.
+  void insert(StringRef NewPath);
+
+  /// Finds the corresponding file in this trie.
+  ///
+  /// Returns file name stored in this trie that is equivalent to 'FileName'
+  /// according to 'Comparator', if it can be uniquely identified. If there
+  /// are no matches an empty \c StringRef is returned. If there are ambiguous
+  /// matches, an empty \c StringRef is returned and a corresponding message
+  /// written to 'Error'.
+  StringRef findEquivalent(StringRef FileName,
+                           raw_ostream &Error) const;
+
+private:
+  FileMatchTrieNode *Root;
+  std::unique_ptr<PathComparator> Comparator;
+};
+
+} // namespace tooling
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLING_FILEMATCHTRIE_H
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif