1 //===--- Transformer.cpp - Transformer library implementation ---*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "clang/Tooling/Transformer/Transformer.h" 10 #include "clang/ASTMatchers/ASTMatchFinder.h" 11 #include "clang/ASTMatchers/ASTMatchersInternal.h" 12 #include "clang/Basic/SourceLocation.h" 13 #include "clang/Tooling/Refactoring/AtomicChange.h" 14 #include "llvm/Support/Error.h" 15 #include <map> 16 #include <utility> 17 18 namespace clang { 19 namespace tooling { 20 21 using ::clang::ast_matchers::MatchFinder; 22 23 namespace detail { 24 25 void TransformerImpl::onMatch( 26 const ast_matchers::MatchFinder::MatchResult &Result) { 27 if (Result.Context->getDiagnostics().hasErrorOccurred()) 28 return; 29 30 onMatchImpl(Result); 31 } 32 33 llvm::Expected<llvm::SmallVector<AtomicChange, 1>> 34 TransformerImpl::convertToAtomicChanges( 35 const llvm::SmallVectorImpl<transformer::Edit> &Edits, 36 const MatchFinder::MatchResult &Result) { 37 // Group the transformations, by file, into AtomicChanges, each anchored by 38 // the location of the first change in that file. 39 std::map<FileID, AtomicChange> ChangesByFileID; 40 for (const auto &T : Edits) { 41 auto ID = Result.SourceManager->getFileID(T.Range.getBegin()); 42 auto Iter = ChangesByFileID 43 .emplace(ID, AtomicChange(*Result.SourceManager, 44 T.Range.getBegin(), T.Metadata)) 45 .first; 46 auto &AC = Iter->second; 47 switch (T.Kind) { 48 case transformer::EditKind::Range: 49 if (auto Err = 50 AC.replace(*Result.SourceManager, T.Range, T.Replacement)) { 51 return std::move(Err); 52 } 53 break; 54 case transformer::EditKind::AddInclude: 55 AC.addHeader(T.Replacement); 56 break; 57 } 58 } 59 60 llvm::SmallVector<AtomicChange, 1> Changes; 61 Changes.reserve(ChangesByFileID.size()); 62 for (auto &IDChangePair : ChangesByFileID) 63 Changes.push_back(std::move(IDChangePair.second)); 64 65 return Changes; 66 } 67 68 } // namespace detail 69 70 void Transformer::registerMatchers(MatchFinder *MatchFinder) { 71 for (auto &Matcher : Impl->buildMatchers()) 72 MatchFinder->addDynamicMatcher(Matcher, this); 73 } 74 75 void Transformer::run(const MatchFinder::MatchResult &Result) { 76 if (Result.Context->getDiagnostics().hasErrorOccurred()) 77 return; 78 79 Impl->onMatch(Result); 80 } 81 82 } // namespace tooling 83 } // namespace clang 84