internal/ceres/gmock_gtest_all.cc

// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//
// Google C++ Testing and Mocking Framework (Google Test)
//
// Sometimes it's desirable to build Google Test by compiling a single file.
// This file serves this purpose.

// This line ensures that gtest.h can be compiled on its own, even
// when it's fused.
#include "gtest/gtest.h"

// The following lines pull in the real gtest *.cc files.
// Copyright 2005, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//
// The Google C++ Testing and Mocking Framework (Google Test)

// Copyright 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//
// Utilities for testing Google Test itself and code that uses Google Test
// (e.g. frameworks built on top of Google Test).

// GOOGLETEST_CM0004 DO NOT DELETE

#ifndef GOOGLETEST_INCLUDE_GTEST_GTEST_SPI_H_
#define GOOGLETEST_INCLUDE_GTEST_GTEST_SPI_H_


GTEST_DISABLE_MSC_WARNINGS_PUSH_(4251 \
/* class A needs to have dll-interface to be used by clients of class B */)

namespace testing {

// This helper class can be used to mock out Google Test failure reporting
// so that we can test Google Test or code that builds on Google Test.
//
// An object of this class appends a TestPartResult object to the
// TestPartResultArray object given in the constructor whenever a Google Test
// failure is reported. It can either intercept only failures that are
// generated in the same thread that created this object or it can intercept
// all generated failures. The scope of this mock object can be controlled with
// the second argument to the two arguments constructor.
class GTEST_API_ ScopedFakeTestPartResultReporter
    : public TestPartResultReporterInterface {
 public:
  // The two possible mocking modes of this object.
  enum InterceptMode {
    INTERCEPT_ONLY_CURRENT_THREAD,  // Intercepts only thread local failures.
    INTERCEPT_ALL_THREADS           // Intercepts all failures.
  };

  // The c'tor sets this object as the test part result reporter used
  // by Google Test.  The 'result' parameter specifies where to report the
  // results. This reporter will only catch failures generated in the current
  // thread. DEPRECATED
  explicit ScopedFakeTestPartResultReporter(TestPartResultArray* result);

  // Same as above, but you can choose the interception scope of this object.
  ScopedFakeTestPartResultReporter(InterceptMode intercept_mode,
                                   TestPartResultArray* result);

  // The d'tor restores the previous test part result reporter.
  ~ScopedFakeTestPartResultReporter() override;

  // Appends the TestPartResult object to the TestPartResultArray
  // received in the constructor.
  //
  // This method is from the TestPartResultReporterInterface
  // interface.
  void ReportTestPartResult(const TestPartResult& result) override;

 private:
  void Init();

  const InterceptMode intercept_mode_;
  TestPartResultReporterInterface* old_reporter_;
  TestPartResultArray* const result_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(ScopedFakeTestPartResultReporter);
};

namespace internal {

// A helper class for implementing EXPECT_FATAL_FAILURE() and
// EXPECT_NONFATAL_FAILURE().  Its destructor verifies that the given
// TestPartResultArray contains exactly one failure that has the given
// type and contains the given substring.  If that's not the case, a
// non-fatal failure will be generated.
class GTEST_API_ SingleFailureChecker {
 public:
  // The constructor remembers the arguments.
  SingleFailureChecker(const TestPartResultArray* results,
                       TestPartResult::Type type, const std::string& substr);
  ~SingleFailureChecker();
 private:
  const TestPartResultArray* const results_;
  const TestPartResult::Type type_;
  const std::string substr_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(SingleFailureChecker);
};

}  // namespace internal

}  // namespace testing

GTEST_DISABLE_MSC_WARNINGS_POP_()  //  4251

// A set of macros for testing Google Test assertions or code that's expected
// to generate Google Test fatal failures.  It verifies that the given
// statement will cause exactly one fatal Google Test failure with 'substr'
// being part of the failure message.
//
// There are two different versions of this macro. EXPECT_FATAL_FAILURE only
// affects and considers failures generated in the current thread and
// EXPECT_FATAL_FAILURE_ON_ALL_THREADS does the same but for all threads.
//
// The verification of the assertion is done correctly even when the statement
// throws an exception or aborts the current function.
//
// Known restrictions:
//   - 'statement' cannot reference local non-static variables or
//     non-static members of the current object.
//   - 'statement' cannot return a value.
//   - You cannot stream a failure message to this macro.
//
// Note that even though the implementations of the following two
// macros are much alike, we cannot refactor them to use a common
// helper macro, due to some peculiarity in how the preprocessor
// works.  The AcceptsMacroThatExpandsToUnprotectedComma test in
// gtest_unittest.cc will fail to compile if we do that.
#define EXPECT_FATAL_FAILURE(statement, substr) \
  do { \
    class GTestExpectFatalFailureHelper {\
     public:\
      static void Execute() { statement; }\
    };\
    ::testing::TestPartResultArray gtest_failures;\
    ::testing::internal::SingleFailureChecker gtest_checker(\
        &gtest_failures, ::testing::TestPartResult::kFatalFailure, (substr));\
    {\
      ::testing::ScopedFakeTestPartResultReporter gtest_reporter(\
          ::testing::ScopedFakeTestPartResultReporter:: \
          INTERCEPT_ONLY_CURRENT_THREAD, &gtest_failures);\
      GTestExpectFatalFailureHelper::Execute();\
    }\
  } while (::testing::internal::AlwaysFalse())

#define EXPECT_FATAL_FAILURE_ON_ALL_THREADS(statement, substr) \
  do { \
    class GTestExpectFatalFailureHelper {\
     public:\
      static void Execute() { statement; }\
    };\
    ::testing::TestPartResultArray gtest_failures;\
    ::testing::internal::SingleFailureChecker gtest_checker(\
        &gtest_failures, ::testing::TestPartResult::kFatalFailure, (substr));\
    {\
      ::testing::ScopedFakeTestPartResultReporter gtest_reporter(\
          ::testing::ScopedFakeTestPartResultReporter:: \
          INTERCEPT_ALL_THREADS, &gtest_failures);\
      GTestExpectFatalFailureHelper::Execute();\
    }\
  } while (::testing::internal::AlwaysFalse())

// A macro for testing Google Test assertions or code that's expected to
// generate Google Test non-fatal failures.  It asserts that the given
// statement will cause exactly one non-fatal Google Test failure with 'substr'
// being part of the failure message.
//
// There are two different versions of this macro. EXPECT_NONFATAL_FAILURE only
// affects and considers failures generated in the current thread and
// EXPECT_NONFATAL_FAILURE_ON_ALL_THREADS does the same but for all threads.
//
// 'statement' is allowed to reference local variables and members of
// the current object.
//
// The verification of the assertion is done correctly even when the statement
// throws an exception or aborts the current function.
//
// Known restrictions:
//   - You cannot stream a failure message to this macro.
//
// Note that even though the implementations of the following two
// macros are much alike, we cannot refactor them to use a common
// helper macro, due to some peculiarity in how the preprocessor
// works.  If we do that, the code won't compile when the user gives
// EXPECT_NONFATAL_FAILURE() a statement that contains a macro that
// expands to code containing an unprotected comma.  The
// AcceptsMacroThatExpandsToUnprotectedComma test in gtest_unittest.cc
// catches that.
//
// For the same reason, we have to write
//   if (::testing::internal::AlwaysTrue()) { statement; }
// instead of
//   GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_(statement)
// to avoid an MSVC warning on unreachable code.
#define EXPECT_NONFATAL_FAILURE(statement, substr) \
  do {\
    ::testing::TestPartResultArray gtest_failures;\
    ::testing::internal::SingleFailureChecker gtest_checker(\
        &gtest_failures, ::testing::TestPartResult::kNonFatalFailure, \
        (substr));\
    {\
      ::testing::ScopedFakeTestPartResultReporter gtest_reporter(\
          ::testing::ScopedFakeTestPartResultReporter:: \
          INTERCEPT_ONLY_CURRENT_THREAD, &gtest_failures);\
      if (::testing::internal::AlwaysTrue()) { statement; }\
    }\
  } while (::testing::internal::AlwaysFalse())

#define EXPECT_NONFATAL_FAILURE_ON_ALL_THREADS(statement, substr) \
  do {\
    ::testing::TestPartResultArray gtest_failures;\
    ::testing::internal::SingleFailureChecker gtest_checker(\
        &gtest_failures, ::testing::TestPartResult::kNonFatalFailure, \
        (substr));\
    {\
      ::testing::ScopedFakeTestPartResultReporter gtest_reporter(\
          ::testing::ScopedFakeTestPartResultReporter::INTERCEPT_ALL_THREADS, \
          &gtest_failures);\
      if (::testing::internal::AlwaysTrue()) { statement; }\
    }\
  } while (::testing::internal::AlwaysFalse())

#endif  // GOOGLETEST_INCLUDE_GTEST_GTEST_SPI_H_

#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <wchar.h>
#include <wctype.h>

#include <algorithm>
#include <chrono>  // NOLINT
#include <cmath>
#include <cstdint>
#include <iomanip>
#include <limits>
#include <list>
#include <map>
#include <ostream>  // NOLINT
#include <sstream>
#include <vector>

#if GTEST_OS_LINUX

# include <fcntl.h>  // NOLINT
# include <limits.h>  // NOLINT
# include <sched.h>  // NOLINT
// Declares vsnprintf().  This header is not available on Windows.
# include <strings.h>  // NOLINT
# include <sys/mman.h>  // NOLINT
# include <sys/time.h>  // NOLINT
# include <unistd.h>  // NOLINT
# include <string>

#elif GTEST_OS_ZOS
# include <sys/time.h>  // NOLINT

// On z/OS we additionally need strings.h for strcasecmp.
# include <strings.h>  // NOLINT

#elif GTEST_OS_WINDOWS_MOBILE  // We are on Windows CE.

# include <windows.h>  // NOLINT
# undef min

#elif GTEST_OS_WINDOWS  // We are on Windows proper.

# include <windows.h>  // NOLINT
# undef min

#ifdef _MSC_VER
# include <crtdbg.h>  // NOLINT
#endif

# include <io.h>  // NOLINT
# include <sys/timeb.h>  // NOLINT
# include <sys/types.h>  // NOLINT
# include <sys/stat.h>  // NOLINT

# if GTEST_OS_WINDOWS_MINGW
#  include <sys/time.h>  // NOLINT
# endif  // GTEST_OS_WINDOWS_MINGW

#else

// cpplint thinks that the header is already included, so we want to
// silence it.
# include <sys/time.h>  // NOLINT
# include <unistd.h>  // NOLINT

#endif  // GTEST_OS_LINUX

#if GTEST_HAS_EXCEPTIONS
# include <stdexcept>
#endif

#if GTEST_CAN_STREAM_RESULTS_
# include <arpa/inet.h>  // NOLINT
# include <netdb.h>  // NOLINT
# include <sys/socket.h>  // NOLINT
# include <sys/types.h>  // NOLINT
#endif

// Copyright 2005, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Utility functions and classes used by the Google C++ testing framework.//
// This file contains purely Google Test's internal implementation.  Please
// DO NOT #INCLUDE IT IN A USER PROGRAM.

#ifndef GOOGLETEST_SRC_GTEST_INTERNAL_INL_H_
#define GOOGLETEST_SRC_GTEST_INTERNAL_INL_H_

#ifndef _WIN32_WCE
# include <errno.h>
#endif  // !_WIN32_WCE
#include <stddef.h>
#include <stdlib.h>  // For strtoll/_strtoul64/malloc/free.
#include <string.h>  // For memmove.

#include <algorithm>
#include <cstdint>
#include <memory>
#include <string>
#include <vector>


#if GTEST_CAN_STREAM_RESULTS_
# include <arpa/inet.h>  // NOLINT
# include <netdb.h>  // NOLINT
#endif

#if GTEST_OS_WINDOWS
# include <windows.h>  // NOLINT
#endif  // GTEST_OS_WINDOWS


GTEST_DISABLE_MSC_WARNINGS_PUSH_(4251 \
/* class A needs to have dll-interface to be used by clients of class B */)

namespace testing {

// Declares the flags.
//
// We don't want the users to modify this flag in the code, but want
// Google Test's own unit tests to be able to access it. Therefore we
// declare it here as opposed to in gtest.h.
GTEST_DECLARE_bool_(death_test_use_fork);

namespace internal {

// The value of GetTestTypeId() as seen from within the Google Test
// library.  This is solely for testing GetTestTypeId().
GTEST_API_ extern const TypeId kTestTypeIdInGoogleTest;

// Names of the flags (needed for parsing Google Test flags).
const char kAlsoRunDisabledTestsFlag[] = "also_run_disabled_tests";
const char kBreakOnFailureFlag[] = "break_on_failure";
const char kCatchExceptionsFlag[] = "catch_exceptions";
const char kColorFlag[] = "color";
const char kFailFast[] = "fail_fast";
const char kFilterFlag[] = "filter";
const char kListTestsFlag[] = "list_tests";
const char kOutputFlag[] = "output";
const char kBriefFlag[] = "brief";
const char kPrintTimeFlag[] = "print_time";
const char kPrintUTF8Flag[] = "print_utf8";
const char kRandomSeedFlag[] = "random_seed";
const char kRepeatFlag[] = "repeat";
const char kShuffleFlag[] = "shuffle";
const char kStackTraceDepthFlag[] = "stack_trace_depth";
const char kStreamResultToFlag[] = "stream_result_to";
const char kThrowOnFailureFlag[] = "throw_on_failure";
const char kFlagfileFlag[] = "flagfile";

// A valid random seed must be in [1, kMaxRandomSeed].
const int kMaxRandomSeed = 99999;

// g_help_flag is true if and only if the --help flag or an equivalent form
// is specified on the command line.
GTEST_API_ extern bool g_help_flag;

// Returns the current time in milliseconds.
GTEST_API_ TimeInMillis GetTimeInMillis();

// Returns true if and only if Google Test should use colors in the output.
GTEST_API_ bool ShouldUseColor(bool stdout_is_tty);

// Formats the given time in milliseconds as seconds.
GTEST_API_ std::string FormatTimeInMillisAsSeconds(TimeInMillis ms);

// Converts the given time in milliseconds to a date string in the ISO 8601
// format, without the timezone information.  N.B.: due to the use the
// non-reentrant localtime() function, this function is not thread safe.  Do
// not use it in any code that can be called from multiple threads.
GTEST_API_ std::string FormatEpochTimeInMillisAsIso8601(TimeInMillis ms);

// Parses a string for an Int32 flag, in the form of "--flag=value".
//
// On success, stores the value of the flag in *value, and returns
// true.  On failure, returns false without changing *value.
GTEST_API_ bool ParseInt32Flag(
    const char* str, const char* flag, int32_t* value);

// Returns a random seed in range [1, kMaxRandomSeed] based on the
// given --gtest_random_seed flag value.
inline int GetRandomSeedFromFlag(int32_t random_seed_flag) {
  const unsigned int raw_seed = (random_seed_flag == 0) ?
      static_cast<unsigned int>(GetTimeInMillis()) :
      static_cast<unsigned int>(random_seed_flag);

  // Normalizes the actual seed to range [1, kMaxRandomSeed] such that
  // it's easy to type.
  const int normalized_seed =
      static_cast<int>((raw_seed - 1U) %
                       static_cast<unsigned int>(kMaxRandomSeed)) + 1;
  return normalized_seed;
}

// Returns the first valid random seed after 'seed'.  The behavior is
// undefined if 'seed' is invalid.  The seed after kMaxRandomSeed is
// considered to be 1.
inline int GetNextRandomSeed(int seed) {
  GTEST_CHECK_(1 <= seed && seed <= kMaxRandomSeed)
      << "Invalid random seed " << seed << " - must be in [1, "
      << kMaxRandomSeed << "].";
  const int next_seed = seed + 1;
  return (next_seed > kMaxRandomSeed) ? 1 : next_seed;
}

// This class saves the values of all Google Test flags in its c'tor, and
// restores them in its d'tor.
class GTestFlagSaver {
 public:
  // The c'tor.
  GTestFlagSaver() {
    also_run_disabled_tests_ = GTEST_FLAG(also_run_disabled_tests);
    break_on_failure_ = GTEST_FLAG(break_on_failure);
    catch_exceptions_ = GTEST_FLAG(catch_exceptions);
    color_ = GTEST_FLAG(color);
    death_test_style_ = GTEST_FLAG(death_test_style);
    death_test_use_fork_ = GTEST_FLAG(death_test_use_fork);
    fail_fast_ = GTEST_FLAG(fail_fast);
    filter_ = GTEST_FLAG(filter);
    internal_run_death_test_ = GTEST_FLAG(internal_run_death_test);
    list_tests_ = GTEST_FLAG(list_tests);
    output_ = GTEST_FLAG(output);
    brief_ = GTEST_FLAG(brief);
    print_time_ = GTEST_FLAG(print_time);
    print_utf8_ = GTEST_FLAG(print_utf8);
    random_seed_ = GTEST_FLAG(random_seed);
    repeat_ = GTEST_FLAG(repeat);
    shuffle_ = GTEST_FLAG(shuffle);
    stack_trace_depth_ = GTEST_FLAG(stack_trace_depth);
    stream_result_to_ = GTEST_FLAG(stream_result_to);
    throw_on_failure_ = GTEST_FLAG(throw_on_failure);
  }

  // The d'tor is not virtual.  DO NOT INHERIT FROM THIS CLASS.
  ~GTestFlagSaver() {
    GTEST_FLAG(also_run_disabled_tests) = also_run_disabled_tests_;
    GTEST_FLAG(break_on_failure) = break_on_failure_;
    GTEST_FLAG(catch_exceptions) = catch_exceptions_;
    GTEST_FLAG(color) = color_;
    GTEST_FLAG(death_test_style) = death_test_style_;
    GTEST_FLAG(death_test_use_fork) = death_test_use_fork_;
    GTEST_FLAG(filter) = filter_;
    GTEST_FLAG(fail_fast) = fail_fast_;
    GTEST_FLAG(internal_run_death_test) = internal_run_death_test_;
    GTEST_FLAG(list_tests) = list_tests_;
    GTEST_FLAG(output) = output_;
    GTEST_FLAG(brief) = brief_;
    GTEST_FLAG(print_time) = print_time_;
    GTEST_FLAG(print_utf8) = print_utf8_;
    GTEST_FLAG(random_seed) = random_seed_;
    GTEST_FLAG(repeat) = repeat_;
    GTEST_FLAG(shuffle) = shuffle_;
    GTEST_FLAG(stack_trace_depth) = stack_trace_depth_;
    GTEST_FLAG(stream_result_to) = stream_result_to_;
    GTEST_FLAG(throw_on_failure) = throw_on_failure_;
  }

 private:
  // Fields for saving the original values of flags.
  bool also_run_disabled_tests_;
  bool break_on_failure_;
  bool catch_exceptions_;
  std::string color_;
  std::string death_test_style_;
  bool death_test_use_fork_;
  bool fail_fast_;
  std::string filter_;
  std::string internal_run_death_test_;
  bool list_tests_;
  std::string output_;
  bool brief_;
  bool print_time_;
  bool print_utf8_;
  int32_t random_seed_;
  int32_t repeat_;
  bool shuffle_;
  int32_t stack_trace_depth_;
  std::string stream_result_to_;
  bool throw_on_failure_;
} GTEST_ATTRIBUTE_UNUSED_;

// Converts a Unicode code point to a narrow string in UTF-8 encoding.
// code_point parameter is of type UInt32 because wchar_t may not be
// wide enough to contain a code point.
// If the code_point is not a valid Unicode code point
// (i.e. outside of Unicode range U+0 to U+10FFFF) it will be converted
// to "(Invalid Unicode 0xXXXXXXXX)".
GTEST_API_ std::string CodePointToUtf8(uint32_t code_point);

// Converts a wide string to a narrow string in UTF-8 encoding.
// The wide string is assumed to have the following encoding:
//   UTF-16 if sizeof(wchar_t) == 2 (on Windows, Cygwin)
//   UTF-32 if sizeof(wchar_t) == 4 (on Linux)
// Parameter str points to a null-terminated wide string.
// Parameter num_chars may additionally limit the number
// of wchar_t characters processed. -1 is used when the entire string
// should be processed.
// If the string contains code points that are not valid Unicode code points
// (i.e. outside of Unicode range U+0 to U+10FFFF) they will be output
// as '(Invalid Unicode 0xXXXXXXXX)'. If the string is in UTF16 encoding
// and contains invalid UTF-16 surrogate pairs, values in those pairs
// will be encoded as individual Unicode characters from Basic Normal Plane.
GTEST_API_ std::string WideStringToUtf8(const wchar_t* str, int num_chars);

// Reads the GTEST_SHARD_STATUS_FILE environment variable, and creates the file
// if the variable is present. If a file already exists at this location, this
// function will write over it. If the variable is present, but the file cannot
// be created, prints an error and exits.
void WriteToShardStatusFileIfNeeded();

// Checks whether sharding is enabled by examining the relevant
// environment variable values. If the variables are present,
// but inconsistent (e.g., shard_index >= total_shards), prints
// an error and exits. If in_subprocess_for_death_test, sharding is
// disabled because it must only be applied to the original test
// process. Otherwise, we could filter out death tests we intended to execute.
GTEST_API_ bool ShouldShard(const char* total_shards_str,
                            const char* shard_index_str,
                            bool in_subprocess_for_death_test);

// Parses the environment variable var as a 32-bit integer. If it is unset,
// returns default_val. If it is not a 32-bit integer, prints an error and
// and aborts.
GTEST_API_ int32_t Int32FromEnvOrDie(const char* env_var, int32_t default_val);

// Given the total number of shards, the shard index, and the test id,
// returns true if and only if the test should be run on this shard. The test id
// is some arbitrary but unique non-negative integer assigned to each test
// method. Assumes that 0 <= shard_index < total_shards.
GTEST_API_ bool ShouldRunTestOnShard(
    int total_shards, int shard_index, int test_id);

// STL container utilities.

// Returns the number of elements in the given container that satisfy
// the given predicate.
template <class Container, typename Predicate>
inline int CountIf(const Container& c, Predicate predicate) {
  // Implemented as an explicit loop since std::count_if() in libCstd on
  // Solaris has a non-standard signature.
  int count = 0;
  for (typename Container::const_iterator it = c.begin(); it != c.end(); ++it) {
    if (predicate(*it))
      ++count;
  }
  return count;
}

// Applies a function/functor to each element in the container.
template <class Container, typename Functor>
void ForEach(const Container& c, Functor functor) {
  std::for_each(c.begin(), c.end(), functor);
}

// Returns the i-th element of the vector, or default_value if i is not
// in range [0, v.size()).
template <typename E>
inline E GetElementOr(const std::vector<E>& v, int i, E default_value) {
  return (i < 0 || i >= static_cast<int>(v.size())) ? default_value
                                                    : v[static_cast<size_t>(i)];
}

// Performs an in-place shuffle of a range of the vector's elements.
// 'begin' and 'end' are element indices as an STL-style range;
// i.e. [begin, end) are shuffled, where 'end' == size() means to
// shuffle to the end of the vector.
template <typename E>
void ShuffleRange(internal::Random* random, int begin, int end,
                  std::vector<E>* v) {
  const int size = static_cast<int>(v->size());
  GTEST_CHECK_(0 <= begin && begin <= size)
      << "Invalid shuffle range start " << begin << ": must be in range [0, "
      << size << "].";
  GTEST_CHECK_(begin <= end && end <= size)
      << "Invalid shuffle range finish " << end << ": must be in range ["
      << begin << ", " << size << "].";

  // Fisher-Yates shuffle, from
  // http://en.wikipedia.org/wiki/Fisher-Yates_shuffle
  for (int range_width = end - begin; range_width >= 2; range_width--) {
    const int last_in_range = begin + range_width - 1;
    const int selected =
        begin +
        static_cast<int>(random->Generate(static_cast<uint32_t>(range_width)));
    std::swap((*v)[static_cast<size_t>(selected)],
              (*v)[static_cast<size_t>(last_in_range)]);
  }
}

// Performs an in-place shuffle of the vector's elements.
template <typename E>
inline void Shuffle(internal::Random* random, std::vector<E>* v) {
  ShuffleRange(random, 0, static_cast<int>(v->size()), v);
}

// A function for deleting an object.  Handy for being used as a
// functor.
template <typename T>
static void Delete(T* x) {
  delete x;
}

// A predicate that checks the key of a TestProperty against a known key.
//
// TestPropertyKeyIs is copyable.
class TestPropertyKeyIs {
 public:
  // Constructor.
  //
  // TestPropertyKeyIs has NO default constructor.
  explicit TestPropertyKeyIs(const std::string& key) : key_(key) {}

  // Returns true if and only if the test name of test property matches on key_.
  bool operator()(const TestProperty& test_property) const {
    return test_property.key() == key_;
  }

 private:
  std::string key_;
};

// Class UnitTestOptions.
//
// This class contains functions for processing options the user
// specifies when running the tests.  It has only static members.
//
// In most cases, the user can specify an option using either an
// environment variable or a command line flag.  E.g. you can set the
// test filter using either GTEST_FILTER or --gtest_filter.  If both
// the variable and the flag are present, the latter overrides the
// former.
class GTEST_API_ UnitTestOptions {
 public:
  // Functions for processing the gtest_output flag.

  // Returns the output format, or "" for normal printed output.
  static std::string GetOutputFormat();

  // Returns the absolute path of the requested output file, or the
  // default (test_detail.xml in the original working directory) if
  // none was explicitly specified.
  static std::string GetAbsolutePathToOutputFile();

  // Functions for processing the gtest_filter flag.

  // Returns true if and only if the user-specified filter matches the test
  // suite name and the test name.
  static bool FilterMatchesTest(const std::string& test_suite_name,
                                const std::string& test_name);

#if GTEST_OS_WINDOWS
  // Function for supporting the gtest_catch_exception flag.

  // Returns EXCEPTION_EXECUTE_HANDLER if Google Test should handle the
  // given SEH exception, or EXCEPTION_CONTINUE_SEARCH otherwise.
  // This function is useful as an __except condition.
  static int GTestShouldProcessSEH(DWORD exception_code);
#endif  // GTEST_OS_WINDOWS

  // Returns true if "name" matches the ':' separated list of glob-style
  // filters in "filter".
  static bool MatchesFilter(const std::string& name, const char* filter);
};

// Returns the current application's name, removing directory path if that
// is present.  Used by UnitTestOptions::GetOutputFile.
GTEST_API_ FilePath GetCurrentExecutableName();

// The role interface for getting the OS stack trace as a string.
class OsStackTraceGetterInterface {
 public:
  OsStackTraceGetterInterface() {}
  virtual ~OsStackTraceGetterInterface() {}

  // Returns the current OS stack trace as an std::string.  Parameters:
  //
  //   max_depth  - the maximum number of stack frames to be included
  //                in the trace.
  //   skip_count - the number of top frames to be skipped; doesn't count
  //                against max_depth.
  virtual std::string CurrentStackTrace(int max_depth, int skip_count) = 0;

  // UponLeavingGTest() should be called immediately before Google Test calls
  // user code. It saves some information about the current stack that
  // CurrentStackTrace() will use to find and hide Google Test stack frames.
  virtual void UponLeavingGTest() = 0;

  // This string is inserted in place of stack frames that are part of
  // Google Test's implementation.
  static const char* const kElidedFramesMarker;

 private:
  GTEST_DISALLOW_COPY_AND_ASSIGN_(OsStackTraceGetterInterface);
};

// A working implementation of the OsStackTraceGetterInterface interface.
class OsStackTraceGetter : public OsStackTraceGetterInterface {
 public:
  OsStackTraceGetter() {}

  std::string CurrentStackTrace(int max_depth, int skip_count) override;
  void UponLeavingGTest() override;

 private:
#if GTEST_HAS_ABSL
  Mutex mutex_;  // Protects all internal state.

  // We save the stack frame below the frame that calls user code.
  // We do this because the address of the frame immediately below
  // the user code changes between the call to UponLeavingGTest()
  // and any calls to the stack trace code from within the user code.
  void* caller_frame_ = nullptr;
#endif  // GTEST_HAS_ABSL

  GTEST_DISALLOW_COPY_AND_ASSIGN_(OsStackTraceGetter);
};

// Information about a Google Test trace point.
struct TraceInfo {
  const char* file;
  int line;
  std::string message;
};

// This is the default global test part result reporter used in UnitTestImpl.
// This class should only be used by UnitTestImpl.
class DefaultGlobalTestPartResultReporter
  : public TestPartResultReporterInterface {
 public:
  explicit DefaultGlobalTestPartResultReporter(UnitTestImpl* unit_test);
  // Implements the TestPartResultReporterInterface. Reports the test part
  // result in the current test.
  void ReportTestPartResult(const TestPartResult& result) override;

 private:
  UnitTestImpl* const unit_test_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(DefaultGlobalTestPartResultReporter);
};

// This is the default per thread test part result reporter used in
// UnitTestImpl. This class should only be used by UnitTestImpl.
class DefaultPerThreadTestPartResultReporter
    : public TestPartResultReporterInterface {
 public:
  explicit DefaultPerThreadTestPartResultReporter(UnitTestImpl* unit_test);
  // Implements the TestPartResultReporterInterface. The implementation just
  // delegates to the current global test part result reporter of *unit_test_.
  void ReportTestPartResult(const TestPartResult& result) override;

 private:
  UnitTestImpl* const unit_test_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(DefaultPerThreadTestPartResultReporter);
};

// The private implementation of the UnitTest class.  We don't protect
// the methods under a mutex, as this class is not accessible by a
// user and the UnitTest class that delegates work to this class does
// proper locking.
class GTEST_API_ UnitTestImpl {
 public:
  explicit UnitTestImpl(UnitTest* parent);
  virtual ~UnitTestImpl();

  // There are two different ways to register your own TestPartResultReporter.
  // You can register your own repoter to listen either only for test results
  // from the current thread or for results from all threads.
  // By default, each per-thread test result repoter just passes a new
  // TestPartResult to the global test result reporter, which registers the
  // test part result for the currently running test.

  // Returns the global test part result reporter.
  TestPartResultReporterInterface* GetGlobalTestPartResultReporter();

  // Sets the global test part result reporter.
  void SetGlobalTestPartResultReporter(
      TestPartResultReporterInterface* reporter);

  // Returns the test part result reporter for the current thread.
  TestPartResultReporterInterface* GetTestPartResultReporterForCurrentThread();

  // Sets the test part result reporter for the current thread.
  void SetTestPartResultReporterForCurrentThread(
      TestPartResultReporterInterface* reporter);

  // Gets the number of successful test suites.
  int successful_test_suite_count() const;

  // Gets the number of failed test suites.
  int failed_test_suite_count() const;

  // Gets the number of all test suites.
  int total_test_suite_count() const;

  // Gets the number of all test suites that contain at least one test
  // that should run.
  int test_suite_to_run_count() const;

  // Gets the number of successful tests.
  int successful_test_count() const;

  // Gets the number of skipped tests.
  int skipped_test_count() const;

  // Gets the number of failed tests.
  int failed_test_count() const;

  // Gets the number of disabled tests that will be reported in the XML report.
  int reportable_disabled_test_count() const;

  // Gets the number of disabled tests.
  int disabled_test_count() const;

  // Gets the number of tests to be printed in the XML report.
  int reportable_test_count() const;

  // Gets the number of all tests.
  int total_test_count() const;

  // Gets the number of tests that should run.
  int test_to_run_count() const;

  // Gets the time of the test program start, in ms from the start of the
  // UNIX epoch.
  TimeInMillis start_timestamp() const { return start_timestamp_; }

  // Gets the elapsed time, in milliseconds.
  TimeInMillis elapsed_time() const { return elapsed_time_; }

  // Returns true if and only if the unit test passed (i.e. all test suites
  // passed).
  bool Passed() const { return !Failed(); }

  // Returns true if and only if the unit test failed (i.e. some test suite
  // failed or something outside of all tests failed).
  bool Failed() const {
    return failed_test_suite_count() > 0 || ad_hoc_test_result()->Failed();
  }

  // Gets the i-th test suite among all the test suites. i can range from 0 to
  // total_test_suite_count() - 1. If i is not in that range, returns NULL.
  const TestSuite* GetTestSuite(int i) const {
    const int index = GetElementOr(test_suite_indices_, i, -1);
    return index < 0 ? nullptr : test_suites_[static_cast<size_t>(i)];
  }

  //  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
  const TestCase* GetTestCase(int i) const { return GetTestSuite(i); }
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_

  // Gets the i-th test suite among all the test suites. i can range from 0 to
  // total_test_suite_count() - 1. If i is not in that range, returns NULL.
  TestSuite* GetMutableSuiteCase(int i) {
    const int index = GetElementOr(test_suite_indices_, i, -1);
    return index < 0 ? nullptr : test_suites_[static_cast<size_t>(index)];
  }

  // Provides access to the event listener list.
  TestEventListeners* listeners() { return &listeners_; }

  // Returns the TestResult for the test that's currently running, or
  // the TestResult for the ad hoc test if no test is running.
  TestResult* current_test_result();

  // Returns the TestResult for the ad hoc test.
  const TestResult* ad_hoc_test_result() const { return &ad_hoc_test_result_; }

  // Sets the OS stack trace getter.
  //
  // Does nothing if the input and the current OS stack trace getter
  // are the same; otherwise, deletes the old getter and makes the
  // input the current getter.
  void set_os_stack_trace_getter(OsStackTraceGetterInterface* getter);

  // Returns the current OS stack trace getter if it is not NULL;
  // otherwise, creates an OsStackTraceGetter, makes it the current
  // getter, and returns it.
  OsStackTraceGetterInterface* os_stack_trace_getter();

  // Returns the current OS stack trace as an std::string.
  //
  // The maximum number of stack frames to be included is specified by
  // the gtest_stack_trace_depth flag.  The skip_count parameter
  // specifies the number of top frames to be skipped, which doesn't
  // count against the number of frames to be included.
  //
  // For example, if Foo() calls Bar(), which in turn calls
  // CurrentOsStackTraceExceptTop(1), Foo() will be included in the
  // trace but Bar() and CurrentOsStackTraceExceptTop() won't.
  std::string CurrentOsStackTraceExceptTop(int skip_count) GTEST_NO_INLINE_;

  // Finds and returns a TestSuite with the given name.  If one doesn't
  // exist, creates one and returns it.
  //
  // Arguments:
  //
  //   test_suite_name: name of the test suite
  //   type_param:      the name of the test's type parameter, or NULL if
  //                    this is not a typed or a type-parameterized test.
  //   set_up_tc:       pointer to the function that sets up the test suite
  //   tear_down_tc:    pointer to the function that tears down the test suite
  TestSuite* GetTestSuite(const char* test_suite_name, const char* type_param,
                          internal::SetUpTestSuiteFunc set_up_tc,
                          internal::TearDownTestSuiteFunc tear_down_tc);

//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
  TestCase* GetTestCase(const char* test_case_name, const char* type_param,
                        internal::SetUpTestSuiteFunc set_up_tc,
                        internal::TearDownTestSuiteFunc tear_down_tc) {
    return GetTestSuite(test_case_name, type_param, set_up_tc, tear_down_tc);
  }
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_

  // Adds a TestInfo to the unit test.
  //
  // Arguments:
  //
  //   set_up_tc:    pointer to the function that sets up the test suite
  //   tear_down_tc: pointer to the function that tears down the test suite
  //   test_info:    the TestInfo object
  void AddTestInfo(internal::SetUpTestSuiteFunc set_up_tc,
                   internal::TearDownTestSuiteFunc tear_down_tc,
                   TestInfo* test_info) {
#if GTEST_HAS_DEATH_TEST
    // In order to support thread-safe death tests, we need to
    // remember the original working directory when the test program
    // was first invoked.  We cannot do this in RUN_ALL_TESTS(), as
    // the user may have changed the current directory before calling
    // RUN_ALL_TESTS().  Therefore we capture the current directory in
    // AddTestInfo(), which is called to register a TEST or TEST_F
    // before main() is reached.
    if (original_working_dir_.IsEmpty()) {
      original_working_dir_.Set(FilePath::GetCurrentDir());
      GTEST_CHECK_(!original_working_dir_.IsEmpty())
          << "Failed to get the current working directory.";
    }
#endif  // GTEST_HAS_DEATH_TEST

    GetTestSuite(test_info->test_suite_name(), test_info->type_param(),
                 set_up_tc, tear_down_tc)
        ->AddTestInfo(test_info);
  }

  // Returns ParameterizedTestSuiteRegistry object used to keep track of
  // value-parameterized tests and instantiate and register them.
  internal::ParameterizedTestSuiteRegistry& parameterized_test_registry() {
    return parameterized_test_registry_;
  }

  std::set<std::string>* ignored_parameterized_test_suites() {
    return &ignored_parameterized_test_suites_;
  }

  // Returns TypeParameterizedTestSuiteRegistry object used to keep track of
  // type-parameterized tests and instantiations of them.
  internal::TypeParameterizedTestSuiteRegistry&
  type_parameterized_test_registry() {
    return type_parameterized_test_registry_;
  }

  // Sets the TestSuite object for the test that's currently running.
  void set_current_test_suite(TestSuite* a_current_test_suite) {
    current_test_suite_ = a_current_test_suite;
  }

  // Sets the TestInfo object for the test that's currently running.  If
  // current_test_info is NULL, the assertion results will be stored in
  // ad_hoc_test_result_.
  void set_current_test_info(TestInfo* a_current_test_info) {
    current_test_info_ = a_current_test_info;
  }

  // Registers all parameterized tests defined using TEST_P and
  // INSTANTIATE_TEST_SUITE_P, creating regular tests for each test/parameter
  // combination. This method can be called more then once; it has guards
  // protecting from registering the tests more then once.  If
  // value-parameterized tests are disabled, RegisterParameterizedTests is
  // present but does nothing.
  void RegisterParameterizedTests();

  // Runs all tests in this UnitTest object, prints the result, and
  // returns true if all tests are successful.  If any exception is
  // thrown during a test, this test is considered to be failed, but
  // the rest of the tests will still be run.
  bool RunAllTests();

  // Clears the results of all tests, except the ad hoc tests.
  void ClearNonAdHocTestResult() {
    ForEach(test_suites_, TestSuite::ClearTestSuiteResult);
  }

  // Clears the results of ad-hoc test assertions.
  void ClearAdHocTestResult() {
    ad_hoc_test_result_.Clear();
  }

  // Adds a TestProperty to the current TestResult object when invoked in a
  // context of a test or a test suite, or to the global property set. If the
  // result already contains a property with the same key, the value will be
  // updated.
  void RecordProperty(const TestProperty& test_property);

  enum ReactionToSharding {
    HONOR_SHARDING_PROTOCOL,
    IGNORE_SHARDING_PROTOCOL
  };

  // Matches the full name of each test against the user-specified
  // filter to decide whether the test should run, then records the
  // result in each TestSuite and TestInfo object.
  // If shard_tests == HONOR_SHARDING_PROTOCOL, further filters tests
  // based on sharding variables in the environment.
  // Returns the number of tests that should run.
  int FilterTests(ReactionToSharding shard_tests);

  // Prints the names of the tests matching the user-specified filter flag.
  void ListTestsMatchingFilter();

  const TestSuite* current_test_suite() const { return current_test_suite_; }
  TestInfo* current_test_info() { return current_test_info_; }
  const TestInfo* current_test_info() const { return current_test_info_; }

  // Returns the vector of environments that need to be set-up/torn-down
  // before/after the tests are run.
  std::vector<Environment*>& environments() { return environments_; }

  // Getters for the per-thread Google Test trace stack.
  std::vector<TraceInfo>& gtest_trace_stack() {
    return *(gtest_trace_stack_.pointer());
  }
  const std::vector<TraceInfo>& gtest_trace_stack() const {
    return gtest_trace_stack_.get();
  }

#if GTEST_HAS_DEATH_TEST
  void InitDeathTestSubprocessControlInfo() {
    internal_run_death_test_flag_.reset(ParseInternalRunDeathTestFlag());
  }
  // Returns a pointer to the parsed --gtest_internal_run_death_test
  // flag, or NULL if that flag was not specified.
  // This information is useful only in a death test child process.
  // Must not be called before a call to InitGoogleTest.
  const InternalRunDeathTestFlag* internal_run_death_test_flag() const {
    return internal_run_death_test_flag_.get();
  }

  // Returns a pointer to the current death test factory.
  internal::DeathTestFactory* death_test_factory() {
    return death_test_factory_.get();
  }

  void SuppressTestEventsIfInSubprocess();

  friend class ReplaceDeathTestFactory;
#endif  // GTEST_HAS_DEATH_TEST

  // Initializes the event listener performing XML output as specified by
  // UnitTestOptions. Must not be called before InitGoogleTest.
  void ConfigureXmlOutput();

#if GTEST_CAN_STREAM_RESULTS_
  // Initializes the event listener for streaming test results to a socket.
  // Must not be called before InitGoogleTest.
  void ConfigureStreamingOutput();
#endif

  // Performs initialization dependent upon flag values obtained in
  // ParseGoogleTestFlagsOnly.  Is called from InitGoogleTest after the call to
  // ParseGoogleTestFlagsOnly.  In case a user neglects to call InitGoogleTest
  // this function is also called from RunAllTests.  Since this function can be
  // called more than once, it has to be idempotent.
  void PostFlagParsingInit();

  // Gets the random seed used at the start of the current test iteration.
  int random_seed() const { return random_seed_; }

  // Gets the random number generator.
  internal::Random* random() { return &random_; }

  // Shuffles all test suites, and the tests within each test suite,
  // making sure that death tests are still run first.
  void ShuffleTests();

  // Restores the test suites and tests to their order before the first shuffle.
  void UnshuffleTests();

  // Returns the value of GTEST_FLAG(catch_exceptions) at the moment
  // UnitTest::Run() starts.
  bool catch_exceptions() const { return catch_exceptions_; }

 private:
  friend class ::testing::UnitTest;

  // Used by UnitTest::Run() to capture the state of
  // GTEST_FLAG(catch_exceptions) at the moment it starts.
  void set_catch_exceptions(bool value) { catch_exceptions_ = value; }

  // The UnitTest object that owns this implementation object.
  UnitTest* const parent_;

  // The working directory when the first TEST() or TEST_F() was
  // executed.
  internal::FilePath original_working_dir_;

  // The default test part result reporters.
  DefaultGlobalTestPartResultReporter default_global_test_part_result_reporter_;
  DefaultPerThreadTestPartResultReporter
      default_per_thread_test_part_result_reporter_;

  // Points to (but doesn't own) the global test part result reporter.
  TestPartResultReporterInterface* global_test_part_result_repoter_;

  // Protects read and write access to global_test_part_result_reporter_.
  internal::Mutex global_test_part_result_reporter_mutex_;

  // Points to (but doesn't own) the per-thread test part result reporter.
  internal::ThreadLocal<TestPartResultReporterInterface*>
      per_thread_test_part_result_reporter_;

  // The vector of environments that need to be set-up/torn-down
  // before/after the tests are run.
  std::vector<Environment*> environments_;

  // The vector of TestSuites in their original order.  It owns the
  // elements in the vector.
  std::vector<TestSuite*> test_suites_;

  // Provides a level of indirection for the test suite list to allow
  // easy shuffling and restoring the test suite order.  The i-th
  // element of this vector is the index of the i-th test suite in the
  // shuffled order.
  std::vector<int> test_suite_indices_;

  // ParameterizedTestRegistry object used to register value-parameterized
  // tests.
  internal::ParameterizedTestSuiteRegistry parameterized_test_registry_;
  internal::TypeParameterizedTestSuiteRegistry
      type_parameterized_test_registry_;

  // The set holding the name of parameterized
  // test suites that may go uninstantiated.
  std::set<std::string> ignored_parameterized_test_suites_;

  // Indicates whether RegisterParameterizedTests() has been called already.
  bool parameterized_tests_registered_;

  // Index of the last death test suite registered.  Initially -1.
  int last_death_test_suite_;

  // This points to the TestSuite for the currently running test.  It
  // changes as Google Test goes through one test suite after another.
  // When no test is running, this is set to NULL and Google Test
  // stores assertion results in ad_hoc_test_result_.  Initially NULL.
  TestSuite* current_test_suite_;

  // This points to the TestInfo for the currently running test.  It
  // changes as Google Test goes through one test after another.  When
  // no test is running, this is set to NULL and Google Test stores
  // assertion results in ad_hoc_test_result_.  Initially NULL.
  TestInfo* current_test_info_;

  // Normally, a user only writes assertions inside a TEST or TEST_F,
  // or inside a function called by a TEST or TEST_F.  Since Google
  // Test keeps track of which test is current running, it can
  // associate such an assertion with the test it belongs to.
  //
  // If an assertion is encountered when no TEST or TEST_F is running,
  // Google Test attributes the assertion result to an imaginary "ad hoc"
  // test, and records the result in ad_hoc_test_result_.
  TestResult ad_hoc_test_result_;

  // The list of event listeners that can be used to track events inside
  // Google Test.
  TestEventListeners listeners_;

  // The OS stack trace getter.  Will be deleted when the UnitTest
  // object is destructed.  By default, an OsStackTraceGetter is used,
  // but the user can set this field to use a custom getter if that is
  // desired.
  OsStackTraceGetterInterface* os_stack_trace_getter_;

  // True if and only if PostFlagParsingInit() has been called.
  bool post_flag_parse_init_performed_;

  // The random number seed used at the beginning of the test run.
  int random_seed_;

  // Our random number generator.
  internal::Random random_;

  // The time of the test program start, in ms from the start of the
  // UNIX epoch.
  TimeInMillis start_timestamp_;

  // How long the test took to run, in milliseconds.
  TimeInMillis elapsed_time_;

#if GTEST_HAS_DEATH_TEST
  // The decomposed components of the gtest_internal_run_death_test flag,
  // parsed when RUN_ALL_TESTS is called.
  std::unique_ptr<InternalRunDeathTestFlag> internal_run_death_test_flag_;
  std::unique_ptr<internal::DeathTestFactory> death_test_factory_;
#endif  // GTEST_HAS_DEATH_TEST

  // A per-thread stack of traces created by the SCOPED_TRACE() macro.
  internal::ThreadLocal<std::vector<TraceInfo> > gtest_trace_stack_;

  // The value of GTEST_FLAG(catch_exceptions) at the moment RunAllTests()
  // starts.
  bool catch_exceptions_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(UnitTestImpl);
};  // class UnitTestImpl

// Convenience function for accessing the global UnitTest
// implementation object.
inline UnitTestImpl* GetUnitTestImpl() {
  return UnitTest::GetInstance()->impl();
}

#if GTEST_USES_SIMPLE_RE

// Internal helper functions for implementing the simple regular
// expression matcher.
GTEST_API_ bool IsInSet(char ch, const char* str);
GTEST_API_ bool IsAsciiDigit(char ch);
GTEST_API_ bool IsAsciiPunct(char ch);
GTEST_API_ bool IsRepeat(char ch);
GTEST_API_ bool IsAsciiWhiteSpace(char ch);
GTEST_API_ bool IsAsciiWordChar(char ch);
GTEST_API_ bool IsValidEscape(char ch);
GTEST_API_ bool AtomMatchesChar(bool escaped, char pattern, char ch);
GTEST_API_ bool ValidateRegex(const char* regex);
GTEST_API_ bool MatchRegexAtHead(const char* regex, const char* str);
GTEST_API_ bool MatchRepetitionAndRegexAtHead(
    bool escaped, char ch, char repeat, const char* regex, const char* str);
GTEST_API_ bool MatchRegexAnywhere(const char* regex, const char* str);

#endif  // GTEST_USES_SIMPLE_RE

// Parses the command line for Google Test flags, without initializing
// other parts of Google Test.
GTEST_API_ void ParseGoogleTestFlagsOnly(int* argc, char** argv);
GTEST_API_ void ParseGoogleTestFlagsOnly(int* argc, wchar_t** argv);

#if GTEST_HAS_DEATH_TEST

// Returns the message describing the last system error, regardless of the
// platform.
GTEST_API_ std::string GetLastErrnoDescription();

// Attempts to parse a string into a positive integer pointed to by the
// number parameter.  Returns true if that is possible.
// GTEST_HAS_DEATH_TEST implies that we have ::std::string, so we can use
// it here.
template <typename Integer>
bool ParseNaturalNumber(const ::std::string& str, Integer* number) {
  // Fail fast if the given string does not begin with a digit;
  // this bypasses strtoXXX's "optional leading whitespace and plus
  // or minus sign" semantics, which are undesirable here.
  if (str.empty() || !IsDigit(str[0])) {
    return false;
  }
  errno = 0;

  char* end;
  // BiggestConvertible is the largest integer type that system-provided
  // string-to-number conversion routines can return.
  using BiggestConvertible = unsigned long long;  // NOLINT

  const BiggestConvertible parsed = strtoull(str.c_str(), &end, 10);  // NOLINT
  const bool parse_success = *end == '\0' && errno == 0;

  GTEST_CHECK_(sizeof(Integer) <= sizeof(parsed));

  const Integer result = static_cast<Integer>(parsed);
  if (parse_success && static_cast<BiggestConvertible>(result) == parsed) {
    *number = result;
    return true;
  }
  return false;
}
#endif  // GTEST_HAS_DEATH_TEST

// TestResult contains some private methods that should be hidden from
// Google Test user but are required for testing. This class allow our tests
// to access them.
//
// This class is supplied only for the purpose of testing Google Test's own
// constructs. Do not use it in user tests, either directly or indirectly.
class TestResultAccessor {
 public:
  static void RecordProperty(TestResult* test_result,
                             const std::string& xml_element,
                             const TestProperty& property) {
    test_result->RecordProperty(xml_element, property);
  }

  static void ClearTestPartResults(TestResult* test_result) {
    test_result->ClearTestPartResults();
  }

  static const std::vector<testing::TestPartResult>& test_part_results(
      const TestResult& test_result) {
    return test_result.test_part_results();
  }
};

#if GTEST_CAN_STREAM_RESULTS_

// Streams test results to the given port on the given host machine.
class StreamingListener : public EmptyTestEventListener {
 public:
  // Abstract base class for writing strings to a socket.
  class AbstractSocketWriter {
   public:
    virtual ~AbstractSocketWriter() {}

    // Sends a string to the socket.
    virtual void Send(const std::string& message) = 0;

    // Closes the socket.
    virtual void CloseConnection() {}

    // Sends a string and a newline to the socket.
    void SendLn(const std::string& message) { Send(message + "\n"); }
  };

  // Concrete class for actually writing strings to a socket.
  class SocketWriter : public AbstractSocketWriter {
   public:
    SocketWriter(const std::string& host, const std::string& port)
        : sockfd_(-1), host_name_(host), port_num_(port) {
      MakeConnection();
    }

    ~SocketWriter() override {
      if (sockfd_ != -1)
        CloseConnection();
    }

    // Sends a string to the socket.
    void Send(const std::string& message) override {
      GTEST_CHECK_(sockfd_ != -1)
          << "Send() can be called only when there is a connection.";

      const auto len = static_cast<size_t>(message.length());
      if (write(sockfd_, message.c_str(), len) != static_cast<ssize_t>(len)) {
        GTEST_LOG_(WARNING)
            << "stream_result_to: failed to stream to "
            << host_name_ << ":" << port_num_;
      }
    }

   private:
    // Creates a client socket and connects to the server.
    void MakeConnection();

    // Closes the socket.
    void CloseConnection() override {
      GTEST_CHECK_(sockfd_ != -1)
          << "CloseConnection() can be called only when there is a connection.";

      close(sockfd_);
      sockfd_ = -1;
    }

    int sockfd_;  // socket file descriptor
    const std::string host_name_;
    const std::string port_num_;

    GTEST_DISALLOW_COPY_AND_ASSIGN_(SocketWriter);
  };  // class SocketWriter

  // Escapes '=', '&', '%', and '\n' characters in str as "%xx".
  static std::string UrlEncode(const char* str);

  StreamingListener(const std::string& host, const std::string& port)
      : socket_writer_(new SocketWriter(host, port)) {
    Start();
  }

  explicit StreamingListener(AbstractSocketWriter* socket_writer)
      : socket_writer_(socket_writer) { Start(); }

  void OnTestProgramStart(const UnitTest& /* unit_test */) override {
    SendLn("event=TestProgramStart");
  }

  void OnTestProgramEnd(const UnitTest& unit_test) override {
    // Note that Google Test current only report elapsed time for each
    // test iteration, not for the entire test program.
    SendLn("event=TestProgramEnd&passed=" + FormatBool(unit_test.Passed()));

    // Notify the streaming server to stop.
    socket_writer_->CloseConnection();
  }

  void OnTestIterationStart(const UnitTest& /* unit_test */,
                            int iteration) override {
    SendLn("event=TestIterationStart&iteration=" +
           StreamableToString(iteration));
  }

  void OnTestIterationEnd(const UnitTest& unit_test,
                          int /* iteration */) override {
    SendLn("event=TestIterationEnd&passed=" +
           FormatBool(unit_test.Passed()) + "&elapsed_time=" +
           StreamableToString(unit_test.elapsed_time()) + "ms");
  }

  // Note that "event=TestCaseStart" is a wire format and has to remain
  // "case" for compatibility
  void OnTestCaseStart(const TestCase& test_case) override {
    SendLn(std::string("event=TestCaseStart&name=") + test_case.name());
  }

  // Note that "event=TestCaseEnd" is a wire format and has to remain
  // "case" for compatibility
  void OnTestCaseEnd(const TestCase& test_case) override {
    SendLn("event=TestCaseEnd&passed=" + FormatBool(test_case.Passed()) +
           "&elapsed_time=" + StreamableToString(test_case.elapsed_time()) +
           "ms");
  }

  void OnTestStart(const TestInfo& test_info) override {
    SendLn(std::string("event=TestStart&name=") + test_info.name());
  }

  void OnTestEnd(const TestInfo& test_info) override {
    SendLn("event=TestEnd&passed=" +
           FormatBool((test_info.result())->Passed()) +
           "&elapsed_time=" +
           StreamableToString((test_info.result())->elapsed_time()) + "ms");
  }

  void OnTestPartResult(const TestPartResult& test_part_result) override {
    const char* file_name = test_part_result.file_name();
    if (file_name == nullptr) file_name = "";
    SendLn("event=TestPartResult&file=" + UrlEncode(file_name) +
           "&line=" + StreamableToString(test_part_result.line_number()) +
           "&message=" + UrlEncode(test_part_result.message()));
  }

 private:
  // Sends the given message and a newline to the socket.
  void SendLn(const std::string& message) { socket_writer_->SendLn(message); }

  // Called at the start of streaming to notify the receiver what
  // protocol we are using.
  void Start() { SendLn("gtest_streaming_protocol_version=1.0"); }

  std::string FormatBool(bool value) { return value ? "1" : "0"; }

  const std::unique_ptr<AbstractSocketWriter> socket_writer_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(StreamingListener);
};  // class StreamingListener

#endif  // GTEST_CAN_STREAM_RESULTS_

}  // namespace internal
}  // namespace testing

GTEST_DISABLE_MSC_WARNINGS_POP_()  //  4251

#endif  // GOOGLETEST_SRC_GTEST_INTERNAL_INL_H_

#if GTEST_OS_WINDOWS
# define vsnprintf _vsnprintf
#endif  // GTEST_OS_WINDOWS

#if GTEST_OS_MAC
#ifndef GTEST_OS_IOS
#include <crt_externs.h>
#endif
#endif

#if GTEST_HAS_ABSL
#include "absl/debugging/failure_signal_handler.h"
#include "absl/debugging/stacktrace.h"
#include "absl/debugging/symbolize.h"
#include "absl/strings/str_cat.h"
#endif  // GTEST_HAS_ABSL

namespace testing {

using internal::CountIf;
using internal::ForEach;
using internal::GetElementOr;
using internal::Shuffle;

// Constants.

// A test whose test suite name or test name matches this filter is
// disabled and not run.
static const char kDisableTestFilter[] = "DISABLED_*:*/DISABLED_*";

// A test suite whose name matches this filter is considered a death
// test suite and will be run before test suites whose name doesn't
// match this filter.
static const char kDeathTestSuiteFilter[] = "*DeathTest:*DeathTest/*";

// A test filter that matches everything.
static const char kUniversalFilter[] = "*";

// The default output format.
static const char kDefaultOutputFormat[] = "xml";
// The default output file.
static const char kDefaultOutputFile[] = "test_detail";

// The environment variable name for the test shard index.
static const char kTestShardIndex[] = "GTEST_SHARD_INDEX";
// The environment variable name for the total number of test shards.
static const char kTestTotalShards[] = "GTEST_TOTAL_SHARDS";
// The environment variable name for the test shard status file.
static const char kTestShardStatusFile[] = "GTEST_SHARD_STATUS_FILE";

namespace internal {

// The text used in failure messages to indicate the start of the
// stack trace.
const char kStackTraceMarker[] = "\nStack trace:\n";

// g_help_flag is true if and only if the --help flag or an equivalent form
// is specified on the command line.
bool g_help_flag = false;

// Utilty function to Open File for Writing
static FILE* OpenFileForWriting(const std::string& output_file) {
  FILE* fileout = nullptr;
  FilePath output_file_path(output_file);
  FilePath output_dir(output_file_path.RemoveFileName());

  if (output_dir.CreateDirectoriesRecursively()) {
    fileout = posix::FOpen(output_file.c_str(), "w");
  }
  if (fileout == nullptr) {
    GTEST_LOG_(FATAL) << "Unable to open file \"" << output_file << "\"";
  }
  return fileout;
}

}  // namespace internal

// Bazel passes in the argument to '--test_filter' via the TESTBRIDGE_TEST_ONLY
// environment variable.
static const char* GetDefaultFilter() {
  const char* const testbridge_test_only =
      internal::posix::GetEnv("TESTBRIDGE_TEST_ONLY");
  if (testbridge_test_only != nullptr) {
    return testbridge_test_only;
  }
  return kUniversalFilter;
}

// Bazel passes in the argument to '--test_runner_fail_fast' via the
// TESTBRIDGE_TEST_RUNNER_FAIL_FAST environment variable.
static bool GetDefaultFailFast() {
  const char* const testbridge_test_runner_fail_fast =
      internal::posix::GetEnv("TESTBRIDGE_TEST_RUNNER_FAIL_FAST");
  if (testbridge_test_runner_fail_fast != nullptr) {
    return strcmp(testbridge_test_runner_fail_fast, "1") == 0;
  }
  return false;
}

GTEST_DEFINE_bool_(
    fail_fast, internal::BoolFromGTestEnv("fail_fast", GetDefaultFailFast()),
    "True if and only if a test failure should stop further test execution.");

GTEST_DEFINE_bool_(
    also_run_disabled_tests,
    internal::BoolFromGTestEnv("also_run_disabled_tests", false),
    "Run disabled tests too, in addition to the tests normally being run.");

GTEST_DEFINE_bool_(
    break_on_failure, internal::BoolFromGTestEnv("break_on_failure", false),
    "True if and only if a failed assertion should be a debugger "
    "break-point.");

GTEST_DEFINE_bool_(catch_exceptions,
                   internal::BoolFromGTestEnv("catch_exceptions", true),
                   "True if and only if " GTEST_NAME_
                   " should catch exceptions and treat them as test failures.");

GTEST_DEFINE_string_(
    color,
    internal::StringFromGTestEnv("color", "auto"),
    "Whether to use colors in the output.  Valid values: yes, no, "
    "and auto.  'auto' means to use colors if the output is "
    "being sent to a terminal and the TERM environment variable "
    "is set to a terminal type that supports colors.");

GTEST_DEFINE_string_(
    filter,
    internal::StringFromGTestEnv("filter", GetDefaultFilter()),
    "A colon-separated list of glob (not regex) patterns "
    "for filtering the tests to run, optionally followed by a "
    "'-' and a : separated list of negative patterns (tests to "
    "exclude).  A test is run if it matches one of the positive "
    "patterns and does not match any of the negative patterns.");

GTEST_DEFINE_bool_(
    install_failure_signal_handler,
    internal::BoolFromGTestEnv("install_failure_signal_handler", false),
    "If true and supported on the current platform, " GTEST_NAME_ " should "
    "install a signal handler that dumps debugging information when fatal "
    "signals are raised.");

GTEST_DEFINE_bool_(list_tests, false,
                   "List all tests without running them.");

// The net priority order after flag processing is thus:
//   --gtest_output command line flag
//   GTEST_OUTPUT environment variable
//   XML_OUTPUT_FILE environment variable
//   ''
GTEST_DEFINE_string_(
    output,
    internal::StringFromGTestEnv("output",
      internal::OutputFlagAlsoCheckEnvVar().c_str()),
    "A format (defaults to \"xml\" but can be specified to be \"json\"), "
    "optionally followed by a colon and an output file name or directory. "
    "A directory is indicated by a trailing pathname separator. "
    "Examples: \"xml:filename.xml\", \"xml::directoryname/\". "
    "If a directory is specified, output files will be created "
    "within that directory, with file-names based on the test "
    "executable's name and, if necessary, made unique by adding "
    "digits.");

GTEST_DEFINE_bool_(
    brief, internal::BoolFromGTestEnv("brief", false),
    "True if only test failures should be displayed in text output.");

GTEST_DEFINE_bool_(print_time, internal::BoolFromGTestEnv("print_time", true),
                   "True if and only if " GTEST_NAME_
                   " should display elapsed time in text output.");

GTEST_DEFINE_bool_(print_utf8, internal::BoolFromGTestEnv("print_utf8", true),
                   "True if and only if " GTEST_NAME_
                   " prints UTF8 characters as text.");

GTEST_DEFINE_int32_(
    random_seed,
    internal::Int32FromGTestEnv("random_seed", 0),
    "Random number seed to use when shuffling test orders.  Must be in range "
    "[1, 99999], or 0 to use a seed based on the current time.");

GTEST_DEFINE_int32_(
    repeat,
    internal::Int32FromGTestEnv("repeat", 1),
    "How many times to repeat each test.  Specify a negative number "
    "for repeating forever.  Useful for shaking out flaky tests.");

GTEST_DEFINE_bool_(show_internal_stack_frames, false,
                   "True if and only if " GTEST_NAME_
                   " should include internal stack frames when "
                   "printing test failure stack traces.");

GTEST_DEFINE_bool_(shuffle, internal::BoolFromGTestEnv("shuffle", false),
                   "True if and only if " GTEST_NAME_
                   " should randomize tests' order on every run.");

GTEST_DEFINE_int32_(
    stack_trace_depth,
    internal::Int32FromGTestEnv("stack_trace_depth", kMaxStackTraceDepth),
    "The maximum number of stack frames to print when an "
    "assertion fails.  The valid range is 0 through 100, inclusive.");

GTEST_DEFINE_string_(
    stream_result_to,
    internal::StringFromGTestEnv("stream_result_to", ""),
    "This flag specifies the host name and the port number on which to stream "
    "test results. Example: \"localhost:555\". The flag is effective only on "
    "Linux.");

GTEST_DEFINE_bool_(
    throw_on_failure,
    internal::BoolFromGTestEnv("throw_on_failure", false),
    "When this flag is specified, a failed assertion will throw an exception "
    "if exceptions are enabled or exit the program with a non-zero code "
    "otherwise. For use with an external test framework.");

#if GTEST_USE_OWN_FLAGFILE_FLAG_
GTEST_DEFINE_string_(
    flagfile,
    internal::StringFromGTestEnv("flagfile", ""),
    "This flag specifies the flagfile to read command-line flags from.");
#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_

namespace internal {

// Generates a random number from [0, range), using a Linear
// Congruential Generator (LCG).  Crashes if 'range' is 0 or greater
// than kMaxRange.
uint32_t Random::Generate(uint32_t range) {
  // These constants are the same as are used in glibc's rand(3).
  // Use wider types than necessary to prevent unsigned overflow diagnostics.
  state_ = static_cast<uint32_t>(1103515245ULL*state_ + 12345U) % kMaxRange;

  GTEST_CHECK_(range > 0)
      << "Cannot generate a number in the range [0, 0).";
  GTEST_CHECK_(range <= kMaxRange)
      << "Generation of a number in [0, " << range << ") was requested, "
      << "but this can only generate numbers in [0, " << kMaxRange << ").";

  // Converting via modulus introduces a bit of downward bias, but
  // it's simple, and a linear congruential generator isn't too good
  // to begin with.
  return state_ % range;
}

// GTestIsInitialized() returns true if and only if the user has initialized
// Google Test.  Useful for catching the user mistake of not initializing
// Google Test before calling RUN_ALL_TESTS().
static bool GTestIsInitialized() { return GetArgvs().size() > 0; }

// Iterates over a vector of TestSuites, keeping a running sum of the
// results of calling a given int-returning method on each.
// Returns the sum.
static int SumOverTestSuiteList(const std::vector<TestSuite*>& case_list,
                                int (TestSuite::*method)() const) {
  int sum = 0;
  for (size_t i = 0; i < case_list.size(); i++) {
    sum += (case_list[i]->*method)();
  }
  return sum;
}

// Returns true if and only if the test suite passed.
static bool TestSuitePassed(const TestSuite* test_suite) {
  return test_suite->should_run() && test_suite->Passed();
}

// Returns true if and only if the test suite failed.
static bool TestSuiteFailed(const TestSuite* test_suite) {
  return test_suite->should_run() && test_suite->Failed();
}

// Returns true if and only if test_suite contains at least one test that
// should run.
static bool ShouldRunTestSuite(const TestSuite* test_suite) {
  return test_suite->should_run();
}

// AssertHelper constructor.
AssertHelper::AssertHelper(TestPartResult::Type type,
                           const char* file,
                           int line,
                           const char* message)
    : data_(new AssertHelperData(type, file, line, message)) {
}

AssertHelper::~AssertHelper() {
  delete data_;
}

// Message assignment, for assertion streaming support.
void AssertHelper::operator=(const Message& message) const {
  UnitTest::GetInstance()->
    AddTestPartResult(data_->type, data_->file, data_->line,
                      AppendUserMessage(data_->message, message),
                      UnitTest::GetInstance()->impl()
                      ->CurrentOsStackTraceExceptTop(1)
                      // Skips the stack frame for this function itself.
                      );  // NOLINT
}

namespace {

// When TEST_P is found without a matching INSTANTIATE_TEST_SUITE_P
// to creates test cases for it, a syntetic test case is
// inserted to report ether an error or a log message.
//
// This configuration bit will likely be removed at some point.
constexpr bool kErrorOnUninstantiatedParameterizedTest = true;
constexpr bool kErrorOnUninstantiatedTypeParameterizedTest = true;

// A test that fails at a given file/line location with a given message.
class FailureTest : public Test {
 public:
  explicit FailureTest(const CodeLocation& loc, std::string error_message,
                       bool as_error)
      : loc_(loc),
        error_message_(std::move(error_message)),
        as_error_(as_error) {}

  void TestBody() override {
    if (as_error_) {
      AssertHelper(TestPartResult::kNonFatalFailure, loc_.file.c_str(),
                   loc_.line, "") = Message() << error_message_;
    } else {
      std::cout << error_message_ << std::endl;
    }
  }

 private:
  const CodeLocation loc_;
  const std::string error_message_;
  const bool as_error_;
};


}  // namespace

std::set<std::string>* GetIgnoredParameterizedTestSuites() {
  return UnitTest::GetInstance()->impl()->ignored_parameterized_test_suites();
}

// Add a given test_suit to the list of them allow to go un-instantiated.
MarkAsIgnored::MarkAsIgnored(const char* test_suite) {
  GetIgnoredParameterizedTestSuites()->insert(test_suite);
}

// If this parameterized test suite has no instantiations (and that
// has not been marked as okay), emit a test case reporting that.
void InsertSyntheticTestCase(const std::string& name, CodeLocation location,
                             bool has_test_p) {
  const auto& ignored = *GetIgnoredParameterizedTestSuites();
  if (ignored.find(name) != ignored.end()) return;

  const char kMissingInstantiation[] =  //
      " is defined via TEST_P, but never instantiated. None of the test cases "
      "will run. Either no INSTANTIATE_TEST_SUITE_P is provided or the only "
      "ones provided expand to nothing."
      "\n\n"
      "Ideally, TEST_P definitions should only ever be included as part of "
      "binaries that intend to use them. (As opposed to, for example, being "
      "placed in a library that may be linked in to get other utilities.)";

  const char kMissingTestCase[] =  //
      " is instantiated via INSTANTIATE_TEST_SUITE_P, but no tests are "
      "defined via TEST_P . No test cases will run."
      "\n\n"
      "Ideally, INSTANTIATE_TEST_SUITE_P should only ever be invoked from "
      "code that always depend on code that provides TEST_P. Failing to do "
      "so is often an indication of dead code, e.g. the last TEST_P was "
      "removed but the rest got left behind.";

  std::string message =
      "Parameterized test suite " + name +
      (has_test_p ? kMissingInstantiation : kMissingTestCase) +
      "\n\n"
      "To suppress this error for this test suite, insert the following line "
      "(in a non-header) in the namespace it is defined in:"
      "\n\n"
      "GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(" + name + ");";

  std::string full_name = "UninstantiatedParameterizedTestSuite<" + name + ">";
  RegisterTest(  //
      "GoogleTestVerification", full_name.c_str(),
      nullptr,  // No type parameter.
      nullptr,  // No value parameter.
      location.file.c_str(), location.line, [message, location] {
        return new FailureTest(location, message,
                               kErrorOnUninstantiatedParameterizedTest);
      });
}

void RegisterTypeParameterizedTestSuite(const char* test_suite_name,
                                        CodeLocation code_location) {
  GetUnitTestImpl()->type_parameterized_test_registry().RegisterTestSuite(
      test_suite_name, code_location);
}

void RegisterTypeParameterizedTestSuiteInstantiation(const char* case_name) {
  GetUnitTestImpl()
      ->type_parameterized_test_registry()
      .RegisterInstantiation(case_name);
}

void TypeParameterizedTestSuiteRegistry::RegisterTestSuite(
    const char* test_suite_name, CodeLocation code_location) {
  suites_.emplace(std::string(test_suite_name),
                 TypeParameterizedTestSuiteInfo(code_location));
}

void TypeParameterizedTestSuiteRegistry::RegisterInstantiation(
        const char* test_suite_name) {
  auto it = suites_.find(std::string(test_suite_name));
  if (it != suites_.end()) {
    it->second.instantiated = true;
  } else {
    GTEST_LOG_(ERROR) << "Unknown type parameterized test suit '"
                      << test_suite_name << "'";
  }
}

void TypeParameterizedTestSuiteRegistry::CheckForInstantiations() {
  const auto& ignored = *GetIgnoredParameterizedTestSuites();
  for (const auto& testcase : suites_) {
    if (testcase.second.instantiated) continue;
    if (ignored.find(testcase.first) != ignored.end()) continue;

    std::string message =
        "Type parameterized test suite " + testcase.first +
        " is defined via REGISTER_TYPED_TEST_SUITE_P, but never instantiated "
        "via INSTANTIATE_TYPED_TEST_SUITE_P. None of the test cases will run."
        "\n\n"
        "Ideally, TYPED_TEST_P definitions should only ever be included as "
        "part of binaries that intend to use them. (As opposed to, for "
        "example, being placed in a library that may be linked in to get other "
        "utilities.)"
        "\n\n"
        "To suppress this error for this test suite, insert the following line "
        "(in a non-header) in the namespace it is defined in:"
        "\n\n"
        "GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(" +
        testcase.first + ");";

    std::string full_name =
        "UninstantiatedTypeParameterizedTestSuite<" + testcase.first + ">";
    RegisterTest(  //
        "GoogleTestVerification", full_name.c_str(),
        nullptr,  // No type parameter.
        nullptr,  // No value parameter.
        testcase.second.code_location.file.c_str(),
        testcase.second.code_location.line, [message, testcase] {
          return new FailureTest(testcase.second.code_location, message,
                                 kErrorOnUninstantiatedTypeParameterizedTest);
        });
  }
}

// A copy of all command line arguments.  Set by InitGoogleTest().
static ::std::vector<std::string> g_argvs;

::std::vector<std::string> GetArgvs() {
#if defined(GTEST_CUSTOM_GET_ARGVS_)
  // GTEST_CUSTOM_GET_ARGVS_() may return a container of std::string or
  // ::string. This code converts it to the appropriate type.
  const auto& custom = GTEST_CUSTOM_GET_ARGVS_();
  return ::std::vector<std::string>(custom.begin(), custom.end());
#else   // defined(GTEST_CUSTOM_GET_ARGVS_)
  return g_argvs;
#endif  // defined(GTEST_CUSTOM_GET_ARGVS_)
}

// Returns the current application's name, removing directory path if that
// is present.
FilePath GetCurrentExecutableName() {
  FilePath result;

#if GTEST_OS_WINDOWS || GTEST_OS_OS2
  result.Set(FilePath(GetArgvs()[0]).RemoveExtension("exe"));
#else
  result.Set(FilePath(GetArgvs()[0]));
#endif  // GTEST_OS_WINDOWS

  return result.RemoveDirectoryName();
}

// Functions for processing the gtest_output flag.

// Returns the output format, or "" for normal printed output.
std::string UnitTestOptions::GetOutputFormat() {
  const char* const gtest_output_flag = GTEST_FLAG(output).c_str();
  const char* const colon = strchr(gtest_output_flag, ':');
  return (colon == nullptr)
             ? std::string(gtest_output_flag)
             : std::string(gtest_output_flag,
                           static_cast<size_t>(colon - gtest_output_flag));
}

// Returns the name of the requested output file, or the default if none
// was explicitly specified.
std::string UnitTestOptions::GetAbsolutePathToOutputFile() {
  const char* const gtest_output_flag = GTEST_FLAG(output).c_str();

  std::string format = GetOutputFormat();
  if (format.empty())
    format = std::string(kDefaultOutputFormat);

  const char* const colon = strchr(gtest_output_flag, ':');
  if (colon == nullptr)
    return internal::FilePath::MakeFileName(
        internal::FilePath(
            UnitTest::GetInstance()->original_working_dir()),
        internal::FilePath(kDefaultOutputFile), 0,
        format.c_str()).string();

  internal::FilePath output_name(colon + 1);
  if (!output_name.IsAbsolutePath())
    output_name = internal::FilePath::ConcatPaths(
        internal::FilePath(UnitTest::GetInstance()->original_working_dir()),
        internal::FilePath(colon + 1));

  if (!output_name.IsDirectory())
    return output_name.string();

  internal::FilePath result(internal::FilePath::GenerateUniqueFileName(
      output_name, internal::GetCurrentExecutableName(),
      GetOutputFormat().c_str()));
  return result.string();
}

// Returns true if and only if the wildcard pattern matches the string. Each
// pattern consists of regular characters, single-character wildcards (?), and
// multi-character wildcards (*).
//
// This function implements a linear-time string globbing algorithm based on
// https://research.swtch.com/glob.
static bool PatternMatchesString(const std::string& name_str,
                                 const char* pattern, const char* pattern_end) {
  const char* name = name_str.c_str();
  const char* const name_begin = name;
  const char* const name_end = name + name_str.size();

  const char* pattern_next = pattern;
  const char* name_next = name;

  while (pattern < pattern_end || name < name_end) {
    if (pattern < pattern_end) {
      switch (*pattern) {
        default:  // Match an ordinary character.
          if (name < name_end && *name == *pattern) {
            ++pattern;
            ++name;
            continue;
          }
          break;
        case '?':  // Match any single character.
          if (name < name_end) {
            ++pattern;
            ++name;
            continue;
          }
          break;
        case '*':
          // Match zero or more characters. Start by skipping over the wildcard
          // and matching zero characters from name. If that fails, restart and
          // match one more character than the last attempt.
          pattern_next = pattern;
          name_next = name + 1;
          ++pattern;
          continue;
      }
    }
    // Failed to match a character. Restart if possible.
    if (name_begin < name_next && name_next <= name_end) {
      pattern = pattern_next;
      name = name_next;
      continue;
    }
    return false;
  }
  return true;
}

bool UnitTestOptions::MatchesFilter(const std::string& name_str,
                                    const char* filter) {
  // The filter is a list of patterns separated by colons (:).
  const char* pattern = filter;
  while (true) {
    // Find the bounds of this pattern.
    const char* const next_sep = strchr(pattern, ':');
    const char* const pattern_end =
        next_sep != nullptr ? next_sep : pattern + strlen(pattern);

    // Check if this pattern matches name_str.
    if (PatternMatchesString(name_str, pattern, pattern_end)) {
      return true;
    }

    // Give up on this pattern. However, if we found a pattern separator (:),
    // advance to the next pattern (skipping over the separator) and restart.
    if (next_sep == nullptr) {
      return false;
    }
    pattern = next_sep + 1;
  }
  return true;
}

// Returns true if and only if the user-specified filter matches the test
// suite name and the test name.
bool UnitTestOptions::FilterMatchesTest(const std::string& test_suite_name,
                                        const std::string& test_name) {
  const std::string& full_name = test_suite_name + "." + test_name.c_str();

  // Split --gtest_filter at '-', if there is one, to separate into
  // positive filter and negative filter portions
  const char* const p = GTEST_FLAG(filter).c_str();
  const char* const dash = strchr(p, '-');
  std::string positive;
  std::string negative;
  if (dash == nullptr) {
    positive = GTEST_FLAG(filter).c_str();  // Whole string is a positive filter
    negative = "";
  } else {
    positive = std::string(p, dash);   // Everything up to the dash
    negative = std::string(dash + 1);  // Everything after the dash
    if (positive.empty()) {
      // Treat '-test1' as the same as '*-test1'
      positive = kUniversalFilter;
    }
  }

  // A filter is a colon-separated list of patterns.  It matches a
  // test if any pattern in it matches the test.
  return (MatchesFilter(full_name, positive.c_str()) &&
          !MatchesFilter(full_name, negative.c_str()));
}

#if GTEST_HAS_SEH
// Returns EXCEPTION_EXECUTE_HANDLER if Google Test should handle the
// given SEH exception, or EXCEPTION_CONTINUE_SEARCH otherwise.
// This function is useful as an __except condition.
int UnitTestOptions::GTestShouldProcessSEH(DWORD exception_code) {
  // Google Test should handle a SEH exception if:
  //   1. the user wants it to, AND
  //   2. this is not a breakpoint exception, AND
  //   3. this is not a C++ exception (VC++ implements them via SEH,
  //      apparently).
  //
  // SEH exception code for C++ exceptions.
  // (see http://support.microsoft.com/kb/185294 for more information).
  const DWORD kCxxExceptionCode = 0xe06d7363;

  bool should_handle = true;

  if (!GTEST_FLAG(catch_exceptions))
    should_handle = false;
  else if (exception_code == EXCEPTION_BREAKPOINT)
    should_handle = false;
  else if (exception_code == kCxxExceptionCode)
    should_handle = false;

  return should_handle ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
}
#endif  // GTEST_HAS_SEH

}  // namespace internal

// The c'tor sets this object as the test part result reporter used by
// Google Test.  The 'result' parameter specifies where to report the
// results. Intercepts only failures from the current thread.
ScopedFakeTestPartResultReporter::ScopedFakeTestPartResultReporter(
    TestPartResultArray* result)
    : intercept_mode_(INTERCEPT_ONLY_CURRENT_THREAD),
      result_(result) {
  Init();
}

// The c'tor sets this object as the test part result reporter used by
// Google Test.  The 'result' parameter specifies where to report the
// results.
ScopedFakeTestPartResultReporter::ScopedFakeTestPartResultReporter(
    InterceptMode intercept_mode, TestPartResultArray* result)
    : intercept_mode_(intercept_mode),
      result_(result) {
  Init();
}

void ScopedFakeTestPartResultReporter::Init() {
  internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
  if (intercept_mode_ == INTERCEPT_ALL_THREADS) {
    old_reporter_ = impl->GetGlobalTestPartResultReporter();
    impl->SetGlobalTestPartResultReporter(this);
  } else {
    old_reporter_ = impl->GetTestPartResultReporterForCurrentThread();
    impl->SetTestPartResultReporterForCurrentThread(this);
  }
}

// The d'tor restores the test part result reporter used by Google Test
// before.
ScopedFakeTestPartResultReporter::~ScopedFakeTestPartResultReporter() {
  internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
  if (intercept_mode_ == INTERCEPT_ALL_THREADS) {
    impl->SetGlobalTestPartResultReporter(old_reporter_);
  } else {
    impl->SetTestPartResultReporterForCurrentThread(old_reporter_);
  }
}

// Increments the test part result count and remembers the result.
// This method is from the TestPartResultReporterInterface interface.
void ScopedFakeTestPartResultReporter::ReportTestPartResult(
    const TestPartResult& result) {
  result_->Append(result);
}

namespace internal {

// Returns the type ID of ::testing::Test.  We should always call this
// instead of GetTypeId< ::testing::Test>() to get the type ID of
// testing::Test.  This is to work around a suspected linker bug when
// using Google Test as a framework on Mac OS X.  The bug causes
// GetTypeId< ::testing::Test>() to return different values depending
// on whether the call is from the Google Test framework itself or
// from user test code.  GetTestTypeId() is guaranteed to always
// return the same value, as it always calls GetTypeId<>() from the
// gtest.cc, which is within the Google Test framework.
TypeId GetTestTypeId() {
  return GetTypeId<Test>();
}

// The value of GetTestTypeId() as seen from within the Google Test
// library.  This is solely for testing GetTestTypeId().
extern const TypeId kTestTypeIdInGoogleTest = GetTestTypeId();

// This predicate-formatter checks that 'results' contains a test part
// failure of the given type and that the failure message contains the
// given substring.
static AssertionResult HasOneFailure(const char* /* results_expr */,
                                     const char* /* type_expr */,
                                     const char* /* substr_expr */,
                                     const TestPartResultArray& results,
                                     TestPartResult::Type type,
                                     const std::string& substr) {
  const std::string expected(type == TestPartResult::kFatalFailure ?
                        "1 fatal failure" :
                        "1 non-fatal failure");
  Message msg;
  if (results.size() != 1) {
    msg << "Expected: " << expected << "\n"
        << "  Actual: " << results.size() << " failures";
    for (int i = 0; i < results.size(); i++) {
      msg << "\n" << results.GetTestPartResult(i);
    }
    return AssertionFailure() << msg;
  }

  const TestPartResult& r = results.GetTestPartResult(0);
  if (r.type() != type) {
    return AssertionFailure() << "Expected: " << expected << "\n"
                              << "  Actual:\n"
                              << r;
  }

  if (strstr(r.message(), substr.c_str()) == nullptr) {
    return AssertionFailure() << "Expected: " << expected << " containing \""
                              << substr << "\"\n"
                              << "  Actual:\n"
                              << r;
  }

  return AssertionSuccess();
}

// The constructor of SingleFailureChecker remembers where to look up
// test part results, what type of failure we expect, and what
// substring the failure message should contain.
SingleFailureChecker::SingleFailureChecker(const TestPartResultArray* results,
                                           TestPartResult::Type type,
                                           const std::string& substr)
    : results_(results), type_(type), substr_(substr) {}

// The destructor of SingleFailureChecker verifies that the given
// TestPartResultArray contains exactly one failure that has the given
// type and contains the given substring.  If that's not the case, a
// non-fatal failure will be generated.
SingleFailureChecker::~SingleFailureChecker() {
  EXPECT_PRED_FORMAT3(HasOneFailure, *results_, type_, substr_);
}

DefaultGlobalTestPartResultReporter::DefaultGlobalTestPartResultReporter(
    UnitTestImpl* unit_test) : unit_test_(unit_test) {}

void DefaultGlobalTestPartResultReporter::ReportTestPartResult(
    const TestPartResult& result) {
  unit_test_->current_test_result()->AddTestPartResult(result);
  unit_test_->listeners()->repeater()->OnTestPartResult(result);
}

DefaultPerThreadTestPartResultReporter::DefaultPerThreadTestPartResultReporter(
    UnitTestImpl* unit_test) : unit_test_(unit_test) {}

void DefaultPerThreadTestPartResultReporter::ReportTestPartResult(
    const TestPartResult& result) {
  unit_test_->GetGlobalTestPartResultReporter()->ReportTestPartResult(result);
}

// Returns the global test part result reporter.
TestPartResultReporterInterface*
UnitTestImpl::GetGlobalTestPartResultReporter() {
  internal::MutexLock lock(&global_test_part_result_reporter_mutex_);
  return global_test_part_result_repoter_;
}

// Sets the global test part result reporter.
void UnitTestImpl::SetGlobalTestPartResultReporter(
    TestPartResultReporterInterface* reporter) {
  internal::MutexLock lock(&global_test_part_result_reporter_mutex_);
  global_test_part_result_repoter_ = reporter;
}

// Returns the test part result reporter for the current thread.
TestPartResultReporterInterface*
UnitTestImpl::GetTestPartResultReporterForCurrentThread() {
  return per_thread_test_part_result_reporter_.get();
}

// Sets the test part result reporter for the current thread.
void UnitTestImpl::SetTestPartResultReporterForCurrentThread(
    TestPartResultReporterInterface* reporter) {
  per_thread_test_part_result_reporter_.set(reporter);
}

// Gets the number of successful test suites.
int UnitTestImpl::successful_test_suite_count() const {
  return CountIf(test_suites_, TestSuitePassed);
}

// Gets the number of failed test suites.
int UnitTestImpl::failed_test_suite_count() const {
  return CountIf(test_suites_, TestSuiteFailed);
}

// Gets the number of all test suites.
int UnitTestImpl::total_test_suite_count() const {
  return static_cast<int>(test_suites_.size());
}

// Gets the number of all test suites that contain at least one test
// that should run.
int UnitTestImpl::test_suite_to_run_count() const {
  return CountIf(test_suites_, ShouldRunTestSuite);
}

// Gets the number of successful tests.
int UnitTestImpl::successful_test_count() const {
  return SumOverTestSuiteList(test_suites_, &TestSuite::successful_test_count);
}

// Gets the number of skipped tests.
int UnitTestImpl::skipped_test_count() const {
  return SumOverTestSuiteList(test_suites_, &TestSuite::skipped_test_count);
}

// Gets the number of failed tests.
int UnitTestImpl::failed_test_count() const {
  return SumOverTestSuiteList(test_suites_, &TestSuite::failed_test_count);
}

// Gets the number of disabled tests that will be reported in the XML report.
int UnitTestImpl::reportable_disabled_test_count() const {
  return SumOverTestSuiteList(test_suites_,
                              &TestSuite::reportable_disabled_test_count);
}

// Gets the number of disabled tests.
int UnitTestImpl::disabled_test_count() const {
  return SumOverTestSuiteList(test_suites_, &TestSuite::disabled_test_count);
}

// Gets the number of tests to be printed in the XML report.
int UnitTestImpl::reportable_test_count() const {
  return SumOverTestSuiteList(test_suites_, &TestSuite::reportable_test_count);
}

// Gets the number of all tests.
int UnitTestImpl::total_test_count() const {
  return SumOverTestSuiteList(test_suites_, &TestSuite::total_test_count);
}

// Gets the number of tests that should run.
int UnitTestImpl::test_to_run_count() const {
  return SumOverTestSuiteList(test_suites_, &TestSuite::test_to_run_count);
}

// Returns the current OS stack trace as an std::string.
//
// The maximum number of stack frames to be included is specified by
// the gtest_stack_trace_depth flag.  The skip_count parameter
// specifies the number of top frames to be skipped, which doesn't
// count against the number of frames to be included.
//
// For example, if Foo() calls Bar(), which in turn calls
// CurrentOsStackTraceExceptTop(1), Foo() will be included in the
// trace but Bar() and CurrentOsStackTraceExceptTop() won't.
std::string UnitTestImpl::CurrentOsStackTraceExceptTop(int skip_count) {
  return os_stack_trace_getter()->CurrentStackTrace(
      static_cast<int>(GTEST_FLAG(stack_trace_depth)),
      skip_count + 1
      // Skips the user-specified number of frames plus this function
      // itself.
      );  // NOLINT
}

// A helper class for measuring elapsed times.
class Timer {
 public:
  Timer() : start_(std::chrono::steady_clock::now()) {}

  // Return time elapsed in milliseconds since the timer was created.
  TimeInMillis Elapsed() {
    return std::chrono::duration_cast<std::chrono::milliseconds>(
               std::chrono::steady_clock::now() - start_)
        .count();
  }

 private:
  std::chrono::steady_clock::time_point start_;
};

// Returns a timestamp as milliseconds since the epoch. Note this time may jump
// around subject to adjustments by the system, to measure elapsed time use
// Timer instead.
TimeInMillis GetTimeInMillis() {
  return std::chrono::duration_cast<std::chrono::milliseconds>(
             std::chrono::system_clock::now() -
             std::chrono::system_clock::from_time_t(0))
      .count();
}

// Utilities

// class String.

#if GTEST_OS_WINDOWS_MOBILE
// Creates a UTF-16 wide string from the given ANSI string, allocating
// memory using new. The caller is responsible for deleting the return
// value using delete[]. Returns the wide string, or NULL if the
// input is NULL.
LPCWSTR String::AnsiToUtf16(const char* ansi) {
  if (!ansi) return nullptr;
  const int length = strlen(ansi);
  const int unicode_length =
      MultiByteToWideChar(CP_ACP, 0, ansi, length, nullptr, 0);
  WCHAR* unicode = new WCHAR[unicode_length + 1];
  MultiByteToWideChar(CP_ACP, 0, ansi, length,
                      unicode, unicode_length);
  unicode[unicode_length] = 0;
  return unicode;
}

// Creates an ANSI string from the given wide string, allocating
// memory using new. The caller is responsible for deleting the return
// value using delete[]. Returns the ANSI string, or NULL if the
// input is NULL.
const char* String::Utf16ToAnsi(LPCWSTR utf16_str)  {
  if (!utf16_str) return nullptr;
  const int ansi_length = WideCharToMultiByte(CP_ACP, 0, utf16_str, -1, nullptr,
                                              0, nullptr, nullptr);
  char* ansi = new char[ansi_length + 1];
  WideCharToMultiByte(CP_ACP, 0, utf16_str, -1, ansi, ansi_length, nullptr,
                      nullptr);
  ansi[ansi_length] = 0;
  return ansi;
}

#endif  // GTEST_OS_WINDOWS_MOBILE

// Compares two C strings.  Returns true if and only if they have the same
// content.
//
// Unlike strcmp(), this function can handle NULL argument(s).  A NULL
// C string is considered different to any non-NULL C string,
// including the empty string.
bool String::CStringEquals(const char * lhs, const char * rhs) {
  if (lhs == nullptr) return rhs == nullptr;

  if (rhs == nullptr) return false;

  return strcmp(lhs, rhs) == 0;
}

#if GTEST_HAS_STD_WSTRING

// Converts an array of wide chars to a narrow string using the UTF-8
// encoding, and streams the result to the given Message object.
static void StreamWideCharsToMessage(const wchar_t* wstr, size_t length,
                                     Message* msg) {
  for (size_t i = 0; i != length; ) {  // NOLINT
    if (wstr[i] != L'\0') {
      *msg << WideStringToUtf8(wstr + i, static_cast<int>(length - i));
      while (i != length && wstr[i] != L'\0')
        i++;
    } else {
      *msg << '\0';
      i++;
    }
  }
}

#endif  // GTEST_HAS_STD_WSTRING

void SplitString(const ::std::string& str, char delimiter,
                 ::std::vector< ::std::string>* dest) {
  ::std::vector< ::std::string> parsed;
  ::std::string::size_type pos = 0;
  while (::testing::internal::AlwaysTrue()) {
    const ::std::string::size_type colon = str.find(delimiter, pos);
    if (colon == ::std::string::npos) {
      parsed.push_back(str.substr(pos));
      break;
    } else {
      parsed.push_back(str.substr(pos, colon - pos));
      pos = colon + 1;
    }
  }
  dest->swap(parsed);
}

}  // namespace internal

// Constructs an empty Message.
// We allocate the stringstream separately because otherwise each use of
// ASSERT/EXPECT in a procedure adds over 200 bytes to the procedure's
// stack frame leading to huge stack frames in some cases; gcc does not reuse
// the stack space.
Message::Message() : ss_(new ::std::stringstream) {
  // By default, we want there to be enough precision when printing
  // a double to a Message.
  *ss_ << std::setprecision(std::numeric_limits<double>::digits10 + 2);
}

// These two overloads allow streaming a wide C string to a Message
// using the UTF-8 encoding.
Message& Message::operator <<(const wchar_t* wide_c_str) {
  return *this << internal::String::ShowWideCString(wide_c_str);
}
Message& Message::operator <<(wchar_t* wide_c_str) {
  return *this << internal::String::ShowWideCString(wide_c_str);
}

#if GTEST_HAS_STD_WSTRING
// Converts the given wide string to a narrow string using the UTF-8
// encoding, and streams the result to this Message object.
Message& Message::operator <<(const ::std::wstring& wstr) {
  internal::StreamWideCharsToMessage(wstr.c_str(), wstr.length(), this);
  return *this;
}
#endif  // GTEST_HAS_STD_WSTRING

// Gets the text streamed to this object so far as an std::string.
// Each '\0' character in the buffer is replaced with "\\0".
std::string Message::GetString() const {
  return internal::StringStreamToString(ss_.get());
}

// AssertionResult constructors.
// Used in EXPECT_TRUE/FALSE(assertion_result).
AssertionResult::AssertionResult(const AssertionResult& other)
    : success_(other.success_),
      message_(other.message_.get() != nullptr
                   ? new ::std::string(*other.message_)
                   : static_cast< ::std::string*>(nullptr)) {}

// Swaps two AssertionResults.
void AssertionResult::swap(AssertionResult& other) {
  using std::swap;
  swap(success_, other.success_);
  swap(message_, other.message_);
}

// Returns the assertion's negation. Used with EXPECT/ASSERT_FALSE.
AssertionResult AssertionResult::operator!() const {
  AssertionResult negation(!success_);
  if (message_.get() != nullptr) negation << *message_;
  return negation;
}

// Makes a successful assertion result.
AssertionResult AssertionSuccess() {
  return AssertionResult(true);
}

// Makes a failed assertion result.
AssertionResult AssertionFailure() {
  return AssertionResult(false);
}

// Makes a failed assertion result with the given failure message.
// Deprecated; use AssertionFailure() << message.
AssertionResult AssertionFailure(const Message& message) {
  return AssertionFailure() << message;
}

namespace internal {

namespace edit_distance {
std::vector<EditType> CalculateOptimalEdits(const std::vector<size_t>& left,
                                            const std::vector<size_t>& right) {
  std::vector<std::vector<double> > costs(
      left.size() + 1, std::vector<double>(right.size() + 1));
  std::vector<std::vector<EditType> > best_move(
      left.size() + 1, std::vector<EditType>(right.size() + 1));

  // Populate for empty right.
  for (size_t l_i = 0; l_i < costs.size(); ++l_i) {
    costs[l_i][0] = static_cast<double>(l_i);
    best_move[l_i][0] = kRemove;
  }
  // Populate for empty left.
  for (size_t r_i = 1; r_i < costs[0].size(); ++r_i) {
    costs[0][r_i] = static_cast<double>(r_i);
    best_move[0][r_i] = kAdd;
  }

  for (size_t l_i = 0; l_i < left.size(); ++l_i) {
    for (size_t r_i = 0; r_i < right.size(); ++r_i) {
      if (left[l_i] == right[r_i]) {
        // Found a match. Consume it.
        costs[l_i + 1][r_i + 1] = costs[l_i][r_i];
        best_move[l_i + 1][r_i + 1] = kMatch;
        continue;
      }

      const double add = costs[l_i + 1][r_i];
      const double remove = costs[l_i][r_i + 1];
      const double replace = costs[l_i][r_i];
      if (add < remove && add < replace) {
        costs[l_i + 1][r_i + 1] = add + 1;
        best_move[l_i + 1][r_i + 1] = kAdd;
      } else if (remove < add && remove < replace) {
        costs[l_i + 1][r_i + 1] = remove + 1;
        best_move[l_i + 1][r_i + 1] = kRemove;
      } else {
        // We make replace a little more expensive than add/remove to lower
        // their priority.
        costs[l_i + 1][r_i + 1] = replace + 1.00001;
        best_move[l_i + 1][r_i + 1] = kReplace;
      }
    }
  }

  // Reconstruct the best path. We do it in reverse order.
  std::vector<EditType> best_path;
  for (size_t l_i = left.size(), r_i = right.size(); l_i > 0 || r_i > 0;) {
    EditType move = best_move[l_i][r_i];
    best_path.push_back(move);
    l_i -= move != kAdd;
    r_i -= move != kRemove;
  }
  std::reverse(best_path.begin(), best_path.end());
  return best_path;
}

namespace {

// Helper class to convert string into ids with deduplication.
class InternalStrings {
 public:
  size_t GetId(const std::string& str) {
    IdMap::iterator it = ids_.find(str);
    if (it != ids_.end()) return it->second;
    size_t id = ids_.size();
    return ids_[str] = id;
  }

 private:
  typedef std::map<std::string, size_t> IdMap;
  IdMap ids_;
};

}  // namespace

std::vector<EditType> CalculateOptimalEdits(
    const std::vector<std::string>& left,
    const std::vector<std::string>& right) {
  std::vector<size_t> left_ids, right_ids;
  {
    InternalStrings intern_table;
    for (size_t i = 0; i < left.size(); ++i) {
      left_ids.push_back(intern_table.GetId(left[i]));
    }
    for (size_t i = 0; i < right.size(); ++i) {
      right_ids.push_back(intern_table.GetId(right[i]));
    }
  }
  return CalculateOptimalEdits(left_ids, right_ids);
}

namespace {

// Helper class that holds the state for one hunk and prints it out to the
// stream.
// It reorders adds/removes when possible to group all removes before all
// adds. It also adds the hunk header before printint into the stream.
class Hunk {
 public:
  Hunk(size_t left_start, size_t right_start)
      : left_start_(left_start),
        right_start_(right_start),
        adds_(),
        removes_(),
        common_() {}

  void PushLine(char edit, const char* line) {
    switch (edit) {
      case ' ':
        ++common_;
        FlushEdits();
        hunk_.push_back(std::make_pair(' ', line));
        break;
      case '-':
        ++removes_;
        hunk_removes_.push_back(std::make_pair('-', line));
        break;
      case '+':
        ++adds_;
        hunk_adds_.push_back(std::make_pair('+', line));
        break;
    }
  }

  void PrintTo(std::ostream* os) {
    PrintHeader(os);
    FlushEdits();
    for (std::list<std::pair<char, const char*> >::const_iterator it =
             hunk_.begin();
         it != hunk_.end(); ++it) {
      *os << it->first << it->second << "\n";
    }
  }

  bool has_edits() const { return adds_ || removes_; }

 private:
  void FlushEdits() {
    hunk_.splice(hunk_.end(), hunk_removes_);
    hunk_.splice(hunk_.end(), hunk_adds_);
  }

  // Print a unified diff header for one hunk.
  // The format is
  //   "@@ -<left_start>,<left_length> +<right_start>,<right_length> @@"
  // where the left/right parts are omitted if unnecessary.
  void PrintHeader(std::ostream* ss) const {
    *ss << "@@ ";
    if (removes_) {
      *ss << "-" << left_start_ << "," << (removes_ + common_);
    }
    if (removes_ && adds_) {
      *ss << " ";
    }
    if (adds_) {
      *ss << "+" << right_start_ << "," << (adds_ + common_);
    }
    *ss << " @@\n";
  }

  size_t left_start_, right_start_;
  size_t adds_, removes_, common_;
  std::list<std::pair<char, const char*> > hunk_, hunk_adds_, hunk_removes_;
};

}  // namespace

// Create a list of diff hunks in Unified diff format.
// Each hunk has a header generated by PrintHeader above plus a body with
// lines prefixed with ' ' for no change, '-' for deletion and '+' for
// addition.
// 'context' represents the desired unchanged prefix/suffix around the diff.
// If two hunks are close enough that their contexts overlap, then they are
// joined into one hunk.
std::string CreateUnifiedDiff(const std::vector<std::string>& left,
                              const std::vector<std::string>& right,
                              size_t context) {
  const std::vector<EditType> edits = CalculateOptimalEdits(left, right);

  size_t l_i = 0, r_i = 0, edit_i = 0;
  std::stringstream ss;
  while (edit_i < edits.size()) {
    // Find first edit.
    while (edit_i < edits.size() && edits[edit_i] == kMatch) {
      ++l_i;
      ++r_i;
      ++edit_i;
    }

    // Find the first line to include in the hunk.
    const size_t prefix_context = std::min(l_i, context);
    Hunk hunk(l_i - prefix_context + 1, r_i - prefix_context + 1);
    for (size_t i = prefix_context; i > 0; --i) {
      hunk.PushLine(' ', left[l_i - i].c_str());
    }

    // Iterate the edits until we found enough suffix for the hunk or the input
    // is over.
    size_t n_suffix = 0;
    for (; edit_i < edits.size(); ++edit_i) {
      if (n_suffix >= context) {
        // Continue only if the next hunk is very close.
        auto it = edits.begin() + static_cast<int>(edit_i);
        while (it != edits.end() && *it == kMatch) ++it;
        if (it == edits.end() ||
            static_cast<size_t>(it - edits.begin()) - edit_i >= context) {
          // There is no next edit or it is too far away.
          break;
        }
      }

      EditType edit = edits[edit_i];
      // Reset count when a non match is found.
      n_suffix = edit == kMatch ? n_suffix + 1 : 0;

      if (edit == kMatch || edit == kRemove || edit == kReplace) {
        hunk.PushLine(edit == kMatch ? ' ' : '-', left[l_i].c_str());
      }
      if (edit == kAdd || edit == kReplace) {
        hunk.PushLine('+', right[r_i].c_str());
      }

      // Advance indices, depending on edit type.
      l_i += edit != kAdd;
      r_i += edit != kRemove;
    }

    if (!hunk.has_edits()) {
      // We are done. We don't want this hunk.
      break;
    }

    hunk.PrintTo(&ss);
  }
  return ss.str();
}

}  // namespace edit_distance

namespace {

// The string representation of the values received in EqFailure() are already
// escaped. Split them on escaped '\n' boundaries. Leave all other escaped
// characters the same.
std::vector<std::string> SplitEscapedString(const std::string& str) {
  std::vector<std::string> lines;
  size_t start = 0, end = str.size();
  if (end > 2 && str[0] == '"' && str[end - 1] == '"') {
    ++start;
    --end;
  }
  bool escaped = false;
  for (size_t i = start; i + 1 < end; ++i) {
    if (escaped) {
      escaped = false;
      if (str[i] == 'n') {
        lines.push_back(str.substr(start, i - start - 1));
        start = i + 1;
      }
    } else {
      escaped = str[i] == '\\';
    }
  }
  lines.push_back(str.substr(start, end - start));
  return lines;
}

}  // namespace

// Constructs and returns the message for an equality assertion
// (e.g. ASSERT_EQ, EXPECT_STREQ, etc) failure.
//
// The first four parameters are the expressions used in the assertion
// and their values, as strings.  For example, for ASSERT_EQ(foo, bar)
// where foo is 5 and bar is 6, we have:
//
//   lhs_expression: "foo"
//   rhs_expression: "bar"
//   lhs_value:      "5"
//   rhs_value:      "6"
//
// The ignoring_case parameter is true if and only if the assertion is a
// *_STRCASEEQ*.  When it's true, the string "Ignoring case" will
// be inserted into the message.
AssertionResult EqFailure(const char* lhs_expression,
                          const char* rhs_expression,
                          const std::string& lhs_value,
                          const std::string& rhs_value,
                          bool ignoring_case) {
  Message msg;
  msg << "Expected equality of these values:";
  msg << "\n  " << lhs_expression;
  if (lhs_value != lhs_expression) {
    msg << "\n    Which is: " << lhs_value;
  }
  msg << "\n  " << rhs_expression;
  if (rhs_value != rhs_expression) {
    msg << "\n    Which is: " << rhs_value;
  }

  if (ignoring_case) {
    msg << "\nIgnoring case";
  }

  if (!lhs_value.empty() && !rhs_value.empty()) {
    const std::vector<std::string> lhs_lines =
        SplitEscapedString(lhs_value);
    const std::vector<std::string> rhs_lines =
        SplitEscapedString(rhs_value);
    if (lhs_lines.size() > 1 || rhs_lines.size() > 1) {
      msg << "\nWith diff:\n"
          << edit_distance::CreateUnifiedDiff(lhs_lines, rhs_lines);
    }
  }

  return AssertionFailure() << msg;
}

// Constructs a failure message for Boolean assertions such as EXPECT_TRUE.
std::string GetBoolAssertionFailureMessage(
    const AssertionResult& assertion_result,
    const char* expression_text,
    const char* actual_predicate_value,
    const char* expected_predicate_value) {
  const char* actual_message = assertion_result.message();
  Message msg;
  msg << "Value of: " << expression_text
      << "\n  Actual: " << actual_predicate_value;
  if (actual_message[0] != '\0')
    msg << " (" << actual_message << ")";
  msg << "\nExpected: " << expected_predicate_value;
  return msg.GetString();
}

// Helper function for implementing ASSERT_NEAR.
AssertionResult DoubleNearPredFormat(const char* expr1,
                                     const char* expr2,
                                     const char* abs_error_expr,
                                     double val1,
                                     double val2,
                                     double abs_error) {
  const double diff = fabs(val1 - val2);
  if (diff <= abs_error) return AssertionSuccess();

  // Find the value which is closest to zero.
  const double min_abs = std::min(fabs(val1), fabs(val2));
  // Find the distance to the next double from that value.
  const double epsilon =
      nextafter(min_abs, std::numeric_limits<double>::infinity()) - min_abs;
  // Detect the case where abs_error is so small that EXPECT_NEAR is
  // effectively the same as EXPECT_EQUAL, and give an informative error
  // message so that the situation can be more easily understood without
  // requiring exotic floating-point knowledge.
  // Don't do an epsilon check if abs_error is zero because that implies
  // that an equality check was actually intended.
  if (!(std::isnan)(val1) && !(std::isnan)(val2) && abs_error > 0 &&
      abs_error < epsilon) {
    return AssertionFailure()
           << "The difference between " << expr1 << " and " << expr2 << " is "
           << diff << ", where\n"
           << expr1 << " evaluates to " << val1 << ",\n"
           << expr2 << " evaluates to " << val2 << ".\nThe abs_error parameter "
           << abs_error_expr << " evaluates to " << abs_error
           << " which is smaller than the minimum distance between doubles for "
              "numbers of this magnitude which is "
           << epsilon
           << ", thus making this EXPECT_NEAR check equivalent to "
              "EXPECT_EQUAL. Consider using EXPECT_DOUBLE_EQ instead.";
  }
  return AssertionFailure()
      << "The difference between " << expr1 << " and " << expr2
      << " is " << diff << ", which exceeds " << abs_error_expr << ", where\n"
      << expr1 << " evaluates to " << val1 << ",\n"
      << expr2 << " evaluates to " << val2 << ", and\n"
      << abs_error_expr << " evaluates to " << abs_error << ".";
}


// Helper template for implementing FloatLE() and DoubleLE().