Export clang-format16 via ydblib project

6e6be3a95868fde888d801b7590af4044049563f

1 files changed, 114 insertions, 0 deletions

diff --git a/contrib/libs/clang16/include/clang/Tooling/Transformer/MatchConsumer.h b/contrib/libs/clang16/include/clang/Tooling/Transformer/MatchConsumer.h
new file mode 100644
index 0000000000..ead75d578e
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+++ b/contrib/libs/clang16/include/clang/Tooling/Transformer/MatchConsumer.h
@@ -0,0 +1,114 @@
+#pragma once
+
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+//===--- MatchConsumer.h - MatchConsumer abstraction ------------*- 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 defines the *MatchConsumer* abstraction: a computation over
+/// match results, specifically the `ast_matchers::MatchFinder::MatchResult`
+/// class.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLING_TRANSFORMER_MATCHCONSUMER_H
+#define LLVM_CLANG_TOOLING_TRANSFORMER_MATCHCONSUMER_H
+
+#include "clang/AST/ASTTypeTraits.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/Error.h"
+
+namespace clang {
+namespace transformer {
+/// A failable computation over nodes bound by AST matchers.
+///
+/// The computation should report any errors though its return value (rather
+/// than terminating the program) to enable usage in interactive scenarios like
+/// clang-query.
+///
+/// This is a central abstraction of the Transformer framework.
+template <typename T>
+using MatchConsumer =
+    std::function<Expected<T>(const ast_matchers::MatchFinder::MatchResult &)>;
+
+/// Creates an error that signals that a `MatchConsumer` expected a certain node
+/// to be bound by AST matchers, but it was not actually bound.
+inline llvm::Error notBoundError(llvm::StringRef Id) {
+  return llvm::make_error<llvm::StringError>(llvm::errc::invalid_argument,
+                                             "Id not bound: " + Id);
+}
+
+/// Chooses between the two consumers, based on whether \p ID is bound in the
+/// match.
+template <typename T>
+MatchConsumer<T> ifBound(std::string ID, MatchConsumer<T> TrueC,
+                         MatchConsumer<T> FalseC) {
+  return [=](const ast_matchers::MatchFinder::MatchResult &Result) {
+    auto &Map = Result.Nodes.getMap();
+    return (Map.find(ID) != Map.end() ? TrueC : FalseC)(Result);
+  };
+}
+
+/// A failable computation over nodes bound by AST matchers, with (limited)
+/// reflection via the `toString` method.
+///
+/// The computation should report any errors though its return value (rather
+/// than terminating the program) to enable usage in interactive scenarios like
+/// clang-query.
+///
+/// This is a central abstraction of the Transformer framework. It is a
+/// generalization of `MatchConsumer` and intended to replace it.
+template <typename T> class MatchComputation {
+public:
+  virtual ~MatchComputation() = default;
+
+  /// Evaluates the computation and (potentially) updates the accumulator \c
+  /// Result.  \c Result is undefined in the case of an error. `Result` is an
+  /// out parameter to optimize case where the computation involves composing
+  /// the result of sub-computation evaluations.
+  virtual llvm::Error eval(const ast_matchers::MatchFinder::MatchResult &Match,
+                           T *Result) const = 0;
+
+  /// Convenience version of `eval`, for the case where the computation is being
+  /// evaluated on its own.
+  llvm::Expected<T> eval(const ast_matchers::MatchFinder::MatchResult &R) const;
+
+  /// Constructs a string representation of the computation, for informational
+  /// purposes. The representation must be deterministic, but is not required to
+  /// be unique.
+  virtual std::string toString() const = 0;
+
+protected:
+  MatchComputation() = default;
+
+  // Since this is an abstract class, copying/assigning only make sense for
+  // derived classes implementing `clone()`.
+  MatchComputation(const MatchComputation &) = default;
+  MatchComputation &operator=(const MatchComputation &) = default;
+};
+
+template <typename T>
+llvm::Expected<T> MatchComputation<T>::eval(
+    const ast_matchers::MatchFinder::MatchResult &R) const {
+  T Output;
+  if (auto Err = eval(R, &Output))
+    return std::move(Err);
+  return Output;
+}
+} // namespace transformer
+} // namespace clang
+#endif // LLVM_CLANG_TOOLING_TRANSFORMER_MATCHCONSUMER_H
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif