1 files changed, 72 insertions, 0 deletions
diff --git a/lib/Tooling/Transformer/Transformer.cpp b/lib/Tooling/Transformer/Transformer.cpp
new file mode 100644
index 000000000000..71f0646f4c0e
--- /dev/null
+++ b/lib/Tooling/Transformer/Transformer.cpp
@@ -0,0 +1,72 @@
+//===--- Transformer.cpp - Transformer library implementation ---*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Tooling/Transformer/Transformer.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchersInternal.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Tooling/Refactoring/AtomicChange.h"
+#include "llvm/Support/Error.h"
+#include <utility>
+#include <vector>
+
+using namespace clang;
+using namespace tooling;
+
+using ast_matchers::MatchFinder;
+
+void Transformer::registerMatchers(MatchFinder *MatchFinder) {
+  for (auto &Matcher : transformer::detail::buildMatchers(Rule))
+    MatchFinder->addDynamicMatcher(Matcher, this);
+}
+
+void Transformer::run(const MatchFinder::MatchResult &Result) {
+  if (Result.Context->getDiagnostics().hasErrorOccurred())
+    return;
+
+  transformer::RewriteRule::Case Case =
+      transformer::detail::findSelectedCase(Result, Rule);
+  auto Transformations = transformer::detail::translateEdits(Result, Case.Edits);
+  if (!Transformations) {
+    Consumer(Transformations.takeError());
+    return;
+  }
+
+  if (Transformations->empty()) {
+    // No rewrite applied (but no error encountered either).
+    transformer::detail::getRuleMatchLoc(Result).print(
+        llvm::errs() << "note: skipping match at loc ", *Result.SourceManager);
+    llvm::errs() << "\n";
+    return;
+  }
+
+  // Record the results in the AtomicChange, anchored at the location of the
+  // first change.
+  AtomicChange AC(*Result.SourceManager,
+                  (*Transformations)[0].Range.getBegin());
+  for (const auto &T : *Transformations) {
+    if (auto Err = AC.replace(*Result.SourceManager, T.Range, T.Replacement)) {
+      Consumer(std::move(Err));
+      return;
+    }
+  }
+
+  for (const auto &I : Case.AddedIncludes) {
+    auto &Header = I.first;
+    switch (I.second) {
+    case transformer::IncludeFormat::Quoted:
+      AC.addHeader(Header);
+      break;
+    case transformer::IncludeFormat::Angled:
+      AC.addHeader((llvm::Twine("<") + Header + ">").str());
+      break;
+    }
+  }
+
+  Consumer(std::move(AC));
+}