clang/lib/Tooling/Refactoring.cpp

   1 //===--- Refactoring.cpp - Framework for clang refactoring tools ----------===//
   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 //  Implements tools to support refactorings.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "clang/Tooling/Refactoring.h"
  14 #include "clang/Basic/DiagnosticOptions.h"
  15 #include "clang/Basic/FileManager.h"
  16 #include "clang/Basic/SourceManager.h"
  17 #include "clang/Format/Format.h"
  18 #include "clang/Frontend/TextDiagnosticPrinter.h"
  19 #include "clang/Lex/Lexer.h"
  20 #include "clang/Rewrite/Core/Rewriter.h"
  21 #include "llvm/Support/Path.h"
  22 #include "llvm/Support/raw_os_ostream.h"
  23
  24 namespace clang {
  25 namespace tooling {
  26
  27 RefactoringTool::RefactoringTool(
  28     const CompilationDatabase &Compilations, ArrayRef<std::string> SourcePaths,
  29     std::shared_ptr<PCHContainerOperations> PCHContainerOps)
  30     : ClangTool(Compilations, SourcePaths, std::move(PCHContainerOps)) {}
  31
  32 std::map<std::string, Replacements> &RefactoringTool::getReplacements() {
  33   return FileToReplaces;
  34 }
  35
  36 int RefactoringTool::runAndSave(FrontendActionFactory *ActionFactory) {
  37   if (int Result = run(ActionFactory)) {
  38     return Result;
  39   }
  40
  41   LangOptions DefaultLangOptions;
  42   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
  43   TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), &*DiagOpts);
  44   DiagnosticsEngine Diagnostics(
  45       IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()),
  46       &*DiagOpts, &DiagnosticPrinter, false);
  47   SourceManager Sources(Diagnostics, getFiles());
  48   Rewriter Rewrite(Sources, DefaultLangOptions);
  49
  50   if (!applyAllReplacements(Rewrite)) {
  51     llvm::errs() << "Skipped some replacements.\n";
  52   }
  53
  54   return saveRewrittenFiles(Rewrite);
  55 }
  56
  57 bool RefactoringTool::applyAllReplacements(Rewriter &Rewrite) {
  58   bool Result = true;
  59   for (const auto &Entry : groupReplacementsByFile(
  60            Rewrite.getSourceMgr().getFileManager(), FileToReplaces))
  61     Result = tooling::applyAllReplacements(Entry.second, Rewrite) && Result;
  62   return Result;
  63 }
  64
  65 int RefactoringTool::saveRewrittenFiles(Rewriter &Rewrite) {
  66   return Rewrite.overwriteChangedFiles() ? 1 : 0;
  67 }
  68
  69 bool formatAndApplyAllReplacements(
  70     const std::map<std::string, Replacements> &FileToReplaces,
  71     Rewriter &Rewrite, StringRef Style) {
  72   SourceManager &SM = Rewrite.getSourceMgr();
  73   FileManager &Files = SM.getFileManager();
  74
  75   bool Result = true;
  76   for (const auto &FileAndReplaces : groupReplacementsByFile(
  77            Rewrite.getSourceMgr().getFileManager(), FileToReplaces)) {
  78     const std::string &FilePath = FileAndReplaces.first;
  79     auto &CurReplaces = FileAndReplaces.second;
  80
  81     FileEntryRef Entry = llvm::cantFail(Files.getFileRef(FilePath));
  82     FileID ID = SM.getOrCreateFileID(Entry, SrcMgr::C_User);
  83     StringRef Code = SM.getBufferData(ID);
  84
  85     auto CurStyle = format::getStyle(Style, FilePath, "LLVM");
  86     if (!CurStyle) {
  87       llvm::errs() << llvm::toString(CurStyle.takeError()) << "\n";
  88       return false;
  89     }
  90
  91     auto NewReplacements =
  92         format::formatReplacements(Code, CurReplaces, *CurStyle);
  93     if (!NewReplacements) {
  94       llvm::errs() << llvm::toString(NewReplacements.takeError()) << "\n";
  95       return false;
  96     }
  97     Result = applyAllReplacements(*NewReplacements, Rewrite) && Result;
  98   }
  99   return Result;
 100 }
 101
 102 } // end namespace tooling
 103 } // end namespace clang