gtest-printers.cc | Explore in Territory

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// Google Test - The Google C++ Testing and Mocking Framework
//
// This file implements a universal value printer that can print a
// value of any type T:
//
//   void ::testing::internal::UniversalPrinter<T>::Print(value, ostream_ptr);
//
// It uses the << operator when possible, and prints the bytes in the
// object otherwise.  A user can override its behavior for a class
// type Foo by defining either operator<<(::std::ostream&, const Foo&)
// or void PrintTo(const Foo&, ::std::ostream*) in the namespace that
// defines Foo.

#include "gtest/gtest-printers.h"

#include <stdio.h>

#include <cctype>
#include <cstdint>
#include <cwchar>
#include <iomanip>
#include <ios>
#include <ostream>  // NOLINT
#include <string>
#include <type_traits>

#include "gtest/internal/gtest-port.h"
#include "src/gtest-internal-inl.h"

namespace testing {

namespace {

ostream;

// Prints a segment of bytes in the given object.
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_
GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_
void PrintByteSegmentInObjectTo(const unsigned char* obj_bytes, size_t start,
                                size_t count, ostream* os) { … }

// Prints the bytes in the given value to the given ostream.
void PrintBytesInObjectToImpl(const unsigned char* obj_bytes, size_t count,
                              ostream* os) { … }

// Helpers for widening a character to char32_t. Since the standard does not
// specify if char / wchar_t is signed or unsigned, it is important to first
// convert it to the unsigned type of the same width before widening it to
// char32_t.
template <typename CharType>
char32_t ToChar32(CharType in) { … }

}  // namespace

namespace internal {

// Delegates to PrintBytesInObjectToImpl() to print the bytes in the
// given object.  The delegation simplifies the implementation, which
// uses the << operator and thus is easier done outside of the
// ::testing::internal namespace, which contains a << operator that
// sometimes conflicts with the one in STL.
void PrintBytesInObjectTo(const unsigned char* obj_bytes, size_t count,
                          ostream* os) { … }

// Depending on the value of a char (or wchar_t), we print it in one
// of three formats:
//   - as is if it's a printable ASCII (e.g. 'a', '2', ' '),
//   - as a hexadecimal escape sequence (e.g. '\x7F'), or
//   - as a special escape sequence (e.g. '\r', '\n').
enum CharFormat { … };

// Returns true if c is a printable ASCII character.  We test the
// value of c directly instead of calling isprint(), which is buggy on
// Windows Mobile.
inline bool IsPrintableAscii(char32_t c) { … }

// Prints c (of type char, char8_t, char16_t, char32_t, or wchar_t) as a
// character literal without the quotes, escaping it when necessary; returns how
// c was formatted.
template <typename Char>
static CharFormat PrintAsCharLiteralTo(Char c, ostream* os) { … }

// Prints a char32_t c as if it's part of a string literal, escaping it when
// necessary; returns how c was formatted.
static CharFormat PrintAsStringLiteralTo(char32_t c, ostream* os) { … }

static const char* GetCharWidthPrefix(char) { … }

static const char* GetCharWidthPrefix(signed char) { … }

static const char* GetCharWidthPrefix(unsigned char) { … }

#ifdef __cpp_lib_char8_t
static const char* GetCharWidthPrefix(char8_t) { return "u8"; }
#endif

static const char* GetCharWidthPrefix(char16_t) { … }

static const char* GetCharWidthPrefix(char32_t) { … }

static const char* GetCharWidthPrefix(wchar_t) { … }

// Prints a char c as if it's part of a string literal, escaping it when
// necessary; returns how c was formatted.
static CharFormat PrintAsStringLiteralTo(char c, ostream* os) { … }

#ifdef __cpp_lib_char8_t
static CharFormat PrintAsStringLiteralTo(char8_t c, ostream* os) {
  return PrintAsStringLiteralTo(ToChar32(c), os);
}
#endif

static CharFormat PrintAsStringLiteralTo(char16_t c, ostream* os) { … }

static CharFormat PrintAsStringLiteralTo(wchar_t c, ostream* os) { … }

// Prints a character c (of type char, char8_t, char16_t, char32_t, or wchar_t)
// and its code. '\0' is printed as "'\\0'", other unprintable characters are
// also properly escaped using the standard C++ escape sequence.
template <typename Char>
void PrintCharAndCodeTo(Char c, ostream* os) { … }

void PrintTo(unsigned char c, ::std::ostream* os) { … }
void PrintTo(signed char c, ::std::ostream* os) { … }

// Prints a wchar_t as a symbol if it is printable or as its internal
// code otherwise and also as its code.  L'\0' is printed as "L'\\0'".
void PrintTo(wchar_t wc, ostream* os) { … }

// TODO(dcheng): Consider making this delegate to PrintCharAndCodeTo() as well.
void PrintTo(char32_t c, ::std::ostream* os) { … }

// gcc/clang __{u,}int128_t
#if defined(__SIZEOF_INT128__)
void PrintTo(__uint128_t v, ::std::ostream* os) { … }
void PrintTo(__int128_t v, ::std::ostream* os) { … }
#endif  // __SIZEOF_INT128__

// Prints the given array of characters to the ostream.  CharType must be either
// char, char8_t, char16_t, char32_t, or wchar_t.
// The array starts at begin, the length is len, it may include '\0' characters
// and may not be NUL-terminated.
template <typename CharType>
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_ GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
    GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
        GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_ static CharFormat
        PrintCharsAsStringTo(const CharType* begin, size_t len, ostream* os) { … }

// Prints a (const) char/wchar_t array of 'len' elements, starting at address
// 'begin'.  CharType must be either char or wchar_t.
template <typename CharType>
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_ GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
    GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
        GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_ static void
        UniversalPrintCharArray(const CharType* begin, size_t len,
                                ostream* os) { … }

// Prints a (const) char array of 'len' elements, starting at address 'begin'.
void UniversalPrintArray(const char* begin, size_t len, ostream* os) { … }

#ifdef __cpp_lib_char8_t
// Prints a (const) char8_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char8_t* begin, size_t len, ostream* os) {
  UniversalPrintCharArray(begin, len, os);
}
#endif

// Prints a (const) char16_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char16_t* begin, size_t len, ostream* os) { … }

// Prints a (const) char32_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char32_t* begin, size_t len, ostream* os) { … }

// Prints a (const) wchar_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const wchar_t* begin, size_t len, ostream* os) { … }

namespace {

// Prints a null-terminated C-style string to the ostream.
template <typename Char>
void PrintCStringTo(const Char* s, ostream* os) { … }

}  // anonymous namespace

void PrintTo(const char* s, ostream* os) { … }

#ifdef __cpp_lib_char8_t
void PrintTo(const char8_t* s, ostream* os) { PrintCStringTo(s, os); }
#endif

void PrintTo(const char16_t* s, ostream* os) { … }

void PrintTo(const char32_t* s, ostream* os) { … }

// MSVC compiler can be configured to define whar_t as a typedef
// of unsigned short. Defining an overload for const wchar_t* in that case
// would cause pointers to unsigned shorts be printed as wide strings,
// possibly accessing more memory than intended and causing invalid
// memory accesses. MSVC defines _NATIVE_WCHAR_T_DEFINED symbol when
// wchar_t is implemented as a native type.
#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED)
// Prints the given wide C string to the ostream.
void PrintTo(const wchar_t* s, ostream* os) { … }
#endif  // wchar_t is native

namespace {

bool ContainsUnprintableControlCodes(const char* str, size_t length) { … }

bool IsUTF8TrailByte(unsigned char t) { … }

bool IsValidUTF8(const char* str, size_t length) { … }

void ConditionalPrintAsText(const char* str, size_t length, ostream* os) { … }

}  // anonymous namespace

void PrintStringTo(const ::std::string& s, ostream* os) { … }

#ifdef __cpp_lib_char8_t
void PrintU8StringTo(const ::std::u8string& s, ostream* os) {
  PrintCharsAsStringTo(s.data(), s.size(), os);
}
#endif

void PrintU16StringTo(const ::std::u16string& s, ostream* os) { … }

void PrintU32StringTo(const ::std::u32string& s, ostream* os) { … }

#if GTEST_HAS_STD_WSTRING
void PrintWideStringTo(const ::std::wstring& s, ostream* os) { … }
#endif  // GTEST_HAS_STD_WSTRING

}  // namespace internal

}  // namespace testing
llvm/third-party/unittest/googletest/src/gtest-printers.cc
