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//
// This header file declares the String class and functions used internally by
// Google Test.  They are subject to change without notice. They should not used
// by code external to Google Test.
//
// This header file is #included by <gtest/internal/gtest-internal.h>.
// It should not be #included by other files.

#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_STRING_H_
#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_STRING_H_

#ifdef __BORLANDC__
// string.h is not guaranteed to provide strcpy on C++ Builder.
# include <mem.h>
#endif

#include <string.h>
#include <string>


namespace testing {
namespace internal {

// String - an abstract class holding static string utilities.
class GTEST_API_ String {
 public:
  // Static utility methods

  // Clones a 0-terminated C string, allocating memory using new.  The
  // caller is responsible for deleting the return value using
  // delete[].  Returns the cloned string, or NULL if the input is
  // NULL.
  //
  // This is different from strdup() in string.h, which allocates
  // memory using malloc().
  static const char* CloneCString(const char* c_str);

#if GTEST_OS_WINDOWS_MOBILE
  // Windows CE does not have the 'ANSI' versions of Win32 APIs. To be
  // able to pass strings to Win32 APIs on CE we need to convert them
  // to 'Unicode', UTF-16.

  // 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.
  //
  // The wide string is created using the ANSI codepage (CP_ACP) to
  // match the behaviour of the ANSI versions of Win32 calls and the
  // C runtime.
  static LPCWSTR AnsiToUtf16(const char* c_str);

  // 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.
  //
  // The returned string is created using the ANSI codepage (CP_ACP) to
  // match the behaviour of the ANSI versions of Win32 calls and the
  // C runtime.
  static const char* Utf16ToAnsi(LPCWSTR utf16_str);
#endif

  // Compares two C strings.  Returns true iff 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.
  static bool CStringEquals(const char* lhs, const char* rhs);

  // Converts a wide C string to a String using the UTF-8 encoding.
  // NULL will be converted to "(null)".  If an error occurred during
  // the conversion, "(failed to convert from wide string)" is
  // returned.
  static std::string ShowWideCString(const wchar_t* wide_c_str);

  // Compares two wide C strings.  Returns true iff they have the same
  // content.
  //
  // Unlike wcscmp(), this function can handle NULL argument(s).  A
  // NULL C string is considered different to any non-NULL C string,
  // including the empty string.
  static bool WideCStringEquals(const wchar_t* lhs, const wchar_t* rhs);

  // Compares two C strings, ignoring case.  Returns true iff they
  // have the same content.
  //
  // Unlike strcasecmp(), this function can handle NULL argument(s).
  // A NULL C string is considered different to any non-NULL C string,
  // including the empty string.
  static bool CaseInsensitiveCStringEquals(const char* lhs,
                                           const char* rhs);

  // Compares two wide C strings, ignoring case.  Returns true iff they
  // have the same content.
  //
  // Unlike wcscasecmp(), this function can handle NULL argument(s).
  // A NULL C string is considered different to any non-NULL wide C string,
  // including the empty string.
  // NB: The implementations on different platforms slightly differ.
  // On windows, this method uses _wcsicmp which compares according to LC_CTYPE
  // environment variable. On GNU platform this method uses wcscasecmp
  // which compares according to LC_CTYPE category of the current locale.
  // On MacOS X, it uses towlower, which also uses LC_CTYPE category of the
  // current locale.
  static bool CaseInsensitiveWideCStringEquals(const wchar_t* lhs,
                                               const wchar_t* rhs);

  // Returns true iff the given string ends with the given suffix, ignoring
  // case. Any string is considered to end with an empty suffix.
  static bool EndsWithCaseInsensitive(
      const std::string& str, const std::string& suffix);

  // Formats an int value as "%02d".
  static std::string FormatIntWidth2(int value);  // "%02d" for width == 2

  // Formats an int value as "%X".
  static std::string FormatHexInt(int value);

  // Formats a byte as "%02X".
  static std::string FormatByte(unsigned char value);