unittests/clang-tidy/ClangTidyTest.h

//===--- ClangTidyTest.h - clang-tidy ---------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_TOOLS_EXTRA_UNITTESTS_CLANG_TIDY_CLANG_TIDY_TEST_H
#define LLVM_CLANG_TOOLS_EXTRA_UNITTESTS_CLANG_TIDY_CLANG_TIDY_TEST_H

#include "ClangTidy.h"
#include "ClangTidyDiagnosticConsumer.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Tooling/Refactoring.h"
#include "clang/Tooling/Tooling.h"
#include "gtest/gtest.h"

namespace clang {
namespace tidy {

template <typename T> class ClangTidyTest : public ::testing::Test {
protected:
  ClangTidyTest() : Check(new T), Context(&Errors) {}

  std::string runCheckOn(StringRef Code) {
    ClangTidyDiagnosticConsumer DiagConsumer(Context);
    Check->setContext(&Context);
    EXPECT_TRUE(
        tooling::runToolOnCode(new TestPPAction(*Check, &Context), Code));
    ast_matchers::MatchFinder Finder;
    Check->registerMatchers(&Finder);
    OwningPtr<tooling::FrontendActionFactory> Factory(
        tooling::newFrontendActionFactory(&Finder));
    EXPECT_TRUE(tooling::runToolOnCode(Factory->create(), Code));
    DiagConsumer.finish();
    tooling::Replacements Fixes;
    for (SmallVector<ClangTidyError, 16>::const_iterator I = Errors.begin(),
                                                         E = Errors.end();
         I != E; ++I)
      Fixes.insert(I->Fix.begin(), I->Fix.end());
    return tooling::applyAllReplacements(Code, Fixes);
  }

  void expectNoChanges(StringRef Code) { EXPECT_EQ(Code, runCheckOn(Code)); }

private:
  class TestPPAction : public PreprocessOnlyAction {
  public:
    TestPPAction(ClangTidyCheck &Check, ClangTidyContext *Context)
        : Check(Check), Context(Context) {}

  private:
    virtual bool BeginSourceFileAction(CompilerInstance &Compiler,
                                       llvm::StringRef file_name) {
      Context->setSourceManager(&Compiler.getSourceManager());
      Check.registerPPCallbacks(Compiler);
      return true;
    }

    ClangTidyCheck &Check;
    ClangTidyContext *Context;
  };

  OwningPtr<ClangTidyCheck> Check;
  SmallVector<ClangTidyError, 16> Errors;
  ClangTidyContext Context;
};

} // namespace tidy
} // namespace clang

#endif // LLVM_CLANG_TOOLS_EXTRA_UNITTESTS_CLANG_TIDY_CLANG_TIDY_TEST_H