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 #include <vector> 18 19 namespace clang { 20 namespace tooling { 21 22 using ::clang::ast_matchers::MatchFinder; 23 24 namespace detail { 25 26 void TransformerImpl::onMatch( 27 const ast_matchers::MatchFinder::MatchResult &Result) { 28 if (Result.Context->getDiagnostics().hasErrorOccurred()) 29 return; 30 31 onMatchImpl(Result); 32 } 33 34 llvm::Expected<llvm::SmallVector<AtomicChange, 1>> 35 TransformerImpl::convertToAtomicChanges( 36 const llvm::SmallVectorImpl<transformer::Edit> &Edits, 37 const MatchFinder::MatchResult &Result) { 38 // Group the transformations, by file, into AtomicChanges, each anchored by 39 // the location of the first change in that file. 40 std::map<FileID, AtomicChange> ChangesByFileID; 41 for (const auto &T : Edits) { 42 auto ID = Result.SourceManager->getFileID(T.Range.getBegin()); 43 auto Iter = ChangesByFileID 44 .emplace(ID, AtomicChange(*Result.SourceManager, 45 T.Range.getBegin(), T.Metadata)) 46 .first; 47 auto &AC = Iter->second; 48 switch (T.Kind) { 49 case transformer::EditKind::Range: 50 if (auto Err = 51 AC.replace(*Result.SourceManager, T.Range, T.Replacement)) { 52 return std::move(Err); 53 } 54 break; 55 case transformer::EditKind::AddInclude: 56 AC.addHeader(T.Replacement); 57 break; 58 } 59 } 60 61 llvm::SmallVector<AtomicChange, 1> Changes; 62 Changes.reserve(ChangesByFileID.size()); 63 for (auto &IDChangePair : ChangesByFileID) 64 Changes.push_back(std::move(IDChangePair.second)); 65 66 return Changes; 67 } 68 69 } // namespace detail 70 71 void Transformer::registerMatchers(MatchFinder *MatchFinder) { 72 for (auto &Matcher : Impl->buildMatchers()) 73 MatchFinder->addDynamicMatcher(Matcher, this); 74 } 75 76 void Transformer::run(const MatchFinder::MatchResult &Result) { 77 if (Result.Context->getDiagnostics().hasErrorOccurred()) 78 return; 79 80 Impl->onMatch(Result); 81 } 82 83 } // namespace tooling 84 } // namespace clang 85