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/////////////////////////////////////////////////////////////////////////////
// Copyright (c) Electronic Arts Inc. All rights reserved.
/////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
// This file implements similar functionality to char_traits which is part of
// the C++ standard STL library specification. This is intended for internal
// EASTL use only. Functionality can be accessed through the eastl::string or
// eastl::string_view types.
//
// http://en.cppreference.com/w/cpp/string/char_traits
///////////////////////////////////////////////////////////////////////////////
#ifndef EASTL_CHAR_TRAITS_H
#define EASTL_CHAR_TRAITS_H
#if defined(EA_PRAGMA_ONCE_SUPPORTED)
#pragma once
#endif
#include <EASTL/internal/config.h>
#include <EASTL/type_traits.h>
EA_DISABLE_ALL_VC_WARNINGS()
#include <ctype.h> // toupper, etc.
#include <string.h> // memset, etc.
EA_RESTORE_ALL_VC_WARNINGS()
namespace eastl
{
///////////////////////////////////////////////////////////////////////////////
/// DecodePart
///
/// These implement UTF8/UCS2/UCS4 encoding/decoding.
///
EASTL_API bool DecodePart(const char*& pSrc, const char* pSrcEnd, char*& pDest, char* pDestEnd);
EASTL_API bool DecodePart(const char*& pSrc, const char* pSrcEnd, char16_t*& pDest, char16_t* pDestEnd);
EASTL_API bool DecodePart(const char*& pSrc, const char* pSrcEnd, char32_t*& pDest, char32_t* pDestEnd);
EASTL_API bool DecodePart(const char16_t*& pSrc, const char16_t* pSrcEnd, char*& pDest, char* pDestEnd);
EASTL_API bool DecodePart(const char16_t*& pSrc, const char16_t* pSrcEnd, char16_t*& pDest, char16_t* pDestEnd);
EASTL_API bool DecodePart(const char16_t*& pSrc, const char16_t* pSrcEnd, char32_t*& pDest, char32_t* pDestEnd);
EASTL_API bool DecodePart(const char32_t*& pSrc, const char32_t* pSrcEnd, char*& pDest, char* pDestEnd);
EASTL_API bool DecodePart(const char32_t*& pSrc, const char32_t* pSrcEnd, char16_t*& pDest, char16_t* pDestEnd);
EASTL_API bool DecodePart(const char32_t*& pSrc, const char32_t* pSrcEnd, char32_t*& pDest, char32_t* pDestEnd);
EASTL_API bool DecodePart(const int*& pSrc, const int* pSrcEnd, char*& pDest, char* pDestEnd);
EASTL_API bool DecodePart(const int*& pSrc, const int* pSrcEnd, char16_t*& pDest, char16_t* pDestEnd);
EASTL_API bool DecodePart(const int*& pSrc, const int* pSrcEnd, char32_t*& pDest, char32_t* pDestEnd);
#if EA_CHAR8_UNIQUE
bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd);
bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, char*& pDest, char* pDestEnd);
bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, char16_t*& pDest, char16_t* pDestEnd);
bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, char32_t*& pDest, char32_t* pDestEnd);
bool DecodePart(const char*& pSrc, const char* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd);
bool DecodePart(const char16_t*& pSrc, const char16_t* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd);
bool DecodePart(const char32_t*& pSrc, const char32_t* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd);
#endif
#if EA_WCHAR_UNIQUE
bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd);
bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, char*& pDest, char* pDestEnd);
bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, char16_t*& pDest, char16_t* pDestEnd);
bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, char32_t*& pDest, char32_t* pDestEnd);
bool DecodePart(const char*& pSrc, const char* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd);
bool DecodePart(const char16_t*& pSrc, const char16_t* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd);
bool DecodePart(const char32_t*& pSrc, const char32_t* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd);
#endif
#if EA_CHAR8_UNIQUE && EA_WCHAR_UNIQUE
bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd);
bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd);
#endif
#if EA_WCHAR_UNIQUE
inline bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd)
{
return DecodePart(reinterpret_cast<const char*&>(pSrc), reinterpret_cast<const char*>(pSrcEnd), reinterpret_cast<char*&>(pDest), reinterpret_cast<char*&>(pDestEnd));
}
inline bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, char*& pDest, char* pDestEnd)
{
#if (EA_WCHAR_SIZE == 2)
return DecodePart(reinterpret_cast<const char16_t*&>(pSrc), reinterpret_cast<const char16_t*>(pSrcEnd), pDest, pDestEnd);
#elif (EA_WCHAR_SIZE == 4)
return DecodePart(reinterpret_cast<const char32_t*&>(pSrc), reinterpret_cast<const char32_t*>(pSrcEnd), pDest, pDestEnd);
#endif
}
inline bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, char16_t*& pDest, char16_t* pDestEnd)
{
#if (EA_WCHAR_SIZE == 2)
return DecodePart(reinterpret_cast<const char16_t*&>(pSrc), reinterpret_cast<const char16_t*>(pSrcEnd), pDest, pDestEnd);
#elif (EA_WCHAR_SIZE == 4)
return DecodePart(reinterpret_cast<const char32_t*&>(pSrc), reinterpret_cast<const char32_t*>(pSrcEnd), pDest, pDestEnd);
#endif
}
inline bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, char32_t*& pDest, char32_t* pDestEnd)
{
#if (EA_WCHAR_SIZE == 2)
return DecodePart(reinterpret_cast<const char16_t*&>(pSrc), reinterpret_cast<const char16_t*>(pSrcEnd), pDest, pDestEnd);
#elif (EA_WCHAR_SIZE == 4)
return DecodePart(reinterpret_cast<const char32_t*&>(pSrc), reinterpret_cast<const char32_t*>(pSrcEnd), pDest, pDestEnd);
#endif
}
inline bool DecodePart(const char*& pSrc, const char* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd)
{
#if (EA_WCHAR_SIZE == 2)
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char16_t*&>(pDest), reinterpret_cast<char16_t*>(pDestEnd));
#elif (EA_WCHAR_SIZE == 4)
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char32_t*&>(pDest), reinterpret_cast<char32_t*>(pDestEnd));
#endif
}
inline bool DecodePart(const char16_t*& pSrc, const char16_t* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd)
{
#if (EA_WCHAR_SIZE == 2)
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char16_t*&>(pDest), reinterpret_cast<char16_t*>(pDestEnd));
#elif (EA_WCHAR_SIZE == 4)
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char32_t*&>(pDest), reinterpret_cast<char32_t*>(pDestEnd));
#endif
}
inline bool DecodePart(const char32_t*& pSrc, const char32_t* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd)
{
#if (EA_WCHAR_SIZE == 2)
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char16_t*&>(pDest), reinterpret_cast<char16_t*>(pDestEnd));
#elif (EA_WCHAR_SIZE == 4)
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char32_t*&>(pDest), reinterpret_cast<char32_t*>(pDestEnd));
#endif
}
#endif
#if EA_CHAR8_UNIQUE
inline bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd)
{
return DecodePart(reinterpret_cast<const char*&>(pSrc), reinterpret_cast<const char*>(pSrcEnd), reinterpret_cast<char*&>(pDest), reinterpret_cast<char*&>(pDestEnd));
}
inline bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, char*& pDest, char* pDestEnd)
{
return DecodePart(reinterpret_cast<const char*&>(pSrc), reinterpret_cast<const char*>(pSrcEnd), pDest, pDestEnd);
}
inline bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, char16_t*& pDest, char16_t* pDestEnd)
{
return DecodePart(reinterpret_cast<const char*&>(pSrc), reinterpret_cast<const char*>(pSrcEnd), pDest, pDestEnd);
}
inline bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, char32_t*& pDest, char32_t* pDestEnd)
{
return DecodePart(reinterpret_cast<const char*&>(pSrc), reinterpret_cast<const char*>(pSrcEnd), pDest, pDestEnd);
}
inline bool DecodePart(const char*& pSrc, const char* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd)
{
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char*&>(pDest), reinterpret_cast<char*&>(pDestEnd));
}
inline bool DecodePart(const char16_t*& pSrc, const char16_t* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd)
{
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char*&>(pDest), reinterpret_cast<char*&>(pDestEnd));
}
inline bool DecodePart(const char32_t*& pSrc, const char32_t* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd)
{
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char*&>(pDest), reinterpret_cast<char*&>(pDestEnd));
}
#endif
#if EA_CHAR8_UNIQUE && EA_WCHAR_UNIQUE
inline bool DecodePart(const char8_t*& pSrc, const char8_t* pSrcEnd, wchar_t*& pDest, wchar_t* pDestEnd)
{
#if (EA_WCHAR_SIZE == 2)
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char16_t*&>(pDest), reinterpret_cast<char16_t*>(pDestEnd));
#elif (EA_WCHAR_SIZE == 4)
return DecodePart(pSrc, pSrcEnd, reinterpret_cast<char32_t*&>(pDest), reinterpret_cast<char32_t*>(pDestEnd));
#endif
}
inline bool DecodePart(const wchar_t*& pSrc, const wchar_t* pSrcEnd, char8_t*& pDest, char8_t* pDestEnd)
{
#if (EA_WCHAR_SIZE == 2)
return DecodePart(reinterpret_cast<const char16_t*&>(pSrc), reinterpret_cast<const char16_t*>(pSrcEnd), reinterpret_cast<char*&>(pDest), reinterpret_cast<char*>(pDestEnd));
#elif (EA_WCHAR_SIZE == 4)
return DecodePart(reinterpret_cast<const char32_t*&>(pSrc), reinterpret_cast<const char32_t*>(pSrcEnd), reinterpret_cast<char*&>(pDest), reinterpret_cast<char*>(pDestEnd));
#endif
}
#endif
///////////////////////////////////////////////////////////////////////////////
// 'char traits' functionality
//
inline char CharToLower(char c)
{ return (char)tolower((uint8_t)c); }
template<typename T>
inline T CharToLower(T c)
{ if((unsigned)c <= 0xff) return (T)tolower((uint8_t)c); return c; }
inline char CharToUpper(char c)
{ return (char)toupper((uint8_t)c); }
template<typename T>
inline T CharToUpper(T c)
{ if((unsigned)c <= 0xff) return (T)toupper((uint8_t)c); return c; }
template <typename T>
int Compare(const T* p1, const T* p2, size_t n)
{
for(; n > 0; ++p1, ++p2, --n)
{
if(*p1 != *p2)
return (static_cast<typename make_unsigned<T>::type>(*p1) <
static_cast<typename make_unsigned<T>::type>(*p2)) ? -1 : 1;
}
return 0;
}
inline int Compare(const char* p1, const char* p2, size_t n)
{
return memcmp(p1, p2, n);
}
template <typename T>
inline int CompareI(const T* p1, const T* p2, size_t n)
{
for(; n > 0; ++p1, ++p2, --n)
{
const T c1 = CharToLower(*p1);
const T c2 = CharToLower(*p2);
if(c1 != c2)
return (static_cast<typename make_unsigned<T>::type>(c1) <
static_cast<typename make_unsigned<T>::type>(c2)) ? -1 : 1;
}
return 0;
}
template<typename T>
inline const T* Find(const T* p, T c, size_t n)
{
for(; n > 0; --n, ++p)
{
if(*p == c)
return p;
}
return NULL;
}
inline const char* Find(const char* p, char c, size_t n)
{
return (const char*)memchr(p, c, n);
}
template<typename T>
inline EA_CPP14_CONSTEXPR size_t CharStrlen(const T* p)
{
const auto* pCurrent = p;
while(*pCurrent)
++pCurrent;
return (size_t)(pCurrent - p);
}
template <typename T>
inline T* CharStringUninitializedCopy(const T* pSource, const T* pSourceEnd, T* pDestination)
{
memmove(pDestination, pSource, (size_t)(pSourceEnd - pSource) * sizeof(T));
return pDestination + (pSourceEnd - pSource);
}
template <typename T>
const T* CharTypeStringFindEnd(const T* pBegin, const T* pEnd, T c)
{
const T* pTemp = pEnd;
while(--pTemp >= pBegin)
{
if(*pTemp == c)
return pTemp;
}
return pEnd;
}
template <typename T>
const T* CharTypeStringRSearch(const T* p1Begin, const T* p1End,
const T* p2Begin, const T* p2End)
{
// Test for zero length strings, in which case we have a match or a failure,
// but the return value is the same either way.
if((p1Begin == p1End) || (p2Begin == p2End))
return p1Begin;
// Test for a pattern of length 1.
if((p2Begin + 1) == p2End)
return CharTypeStringFindEnd(p1Begin, p1End, *p2Begin);
// Test for search string length being longer than string length.
if((p2End - p2Begin) > (p1End - p1Begin))
return p1End;
// General case.
const T* pSearchEnd = (p1End - (p2End - p2Begin) + 1);
const T* pCurrent1;
const T* pCurrent2;
while(pSearchEnd != p1Begin)
{
// Search for the last occurrence of *p2Begin.
pCurrent1 = CharTypeStringFindEnd(p1Begin, pSearchEnd, *p2Begin);
if(pCurrent1 == pSearchEnd) // If the first char of p2 wasn't found,
return p1End; // then we immediately have failure.
// In this case, *pTemp == *p2Begin. So compare the rest.
pCurrent2 = p2Begin;
while(*pCurrent1++ == *pCurrent2++)
{
if(pCurrent2 == p2End)
return (pCurrent1 - (p2End - p2Begin));
}
// A smarter algorithm might know to subtract more than just one,
// but in most cases it won't make much difference anyway.
--pSearchEnd;
}
return p1End;
}
template <typename T>
inline const T* CharTypeStringFindFirstOf(const T* p1Begin, const T* p1End, const T* p2Begin, const T* p2End)
{
for (; p1Begin != p1End; ++p1Begin)
{
for (const T* pTemp = p2Begin; pTemp != p2End; ++pTemp)
{
if (*p1Begin == *pTemp)
return p1Begin;
}
}
return p1End;
}
template <typename T>
inline const T* CharTypeStringRFindFirstNotOf(const T* p1RBegin, const T* p1REnd, const T* p2Begin, const T* p2End)
{
for (; p1RBegin != p1REnd; --p1RBegin)
{
const T* pTemp;
for (pTemp = p2Begin; pTemp != p2End; ++pTemp)
{
if (*(p1RBegin - 1) == *pTemp)
break;
}
if (pTemp == p2End)
return p1RBegin;
}
return p1REnd;
}
template <typename T>
inline const T* CharTypeStringFindFirstNotOf(const T* p1Begin, const T* p1End, const T* p2Begin, const T* p2End)
{
for (; p1Begin != p1End; ++p1Begin)
{
const T* pTemp;
for (pTemp = p2Begin; pTemp != p2End; ++pTemp)
{
if (*p1Begin == *pTemp)
break;
}
if (pTemp == p2End)
return p1Begin;
}
return p1End;
}
template <typename T>
inline const T* CharTypeStringRFindFirstOf(const T* p1RBegin, const T* p1REnd, const T* p2Begin, const T* p2End)
{
for (; p1RBegin != p1REnd; --p1RBegin)
{
for (const T* pTemp = p2Begin; pTemp != p2End; ++pTemp)
{
if (*(p1RBegin - 1) == *pTemp)
return p1RBegin;
}
}
return p1REnd;
}
template <typename T>
inline const T* CharTypeStringRFind(const T* pRBegin, const T* pREnd, const T c)
{
while (pRBegin > pREnd)
{
if (*(pRBegin - 1) == c)
return pRBegin;
--pRBegin;
}
return pREnd;
}
inline char* CharStringUninitializedFillN(char* pDestination, size_t n, const char c)
{
if(n) // Some compilers (e.g. GCC 4.3+) generate a warning (which can't be disabled) if you call memset with a size of 0.
memset(pDestination, (uint8_t)c, (size_t)n);
return pDestination + n;
}
template<typename T>
inline T* CharStringUninitializedFillN(T* pDestination, size_t n, const T c)
{
T * pDest = pDestination;
const T* const pEnd = pDestination + n;
while(pDest < pEnd)
*pDest++ = c;
return pDestination + n;
}
inline char* CharTypeAssignN(char* pDestination, size_t n, char c)
{
if(n) // Some compilers (e.g. GCC 4.3+) generate a warning (which can't be disabled) if you call memset with a size of 0.
return (char*)memset(pDestination, c, (size_t)n);
return pDestination;
}
template<typename T>
inline T* CharTypeAssignN(T* pDestination, size_t n, T c)
{
T* pDest = pDestination;
const T* const pEnd = pDestination + n;
while(pDest < pEnd)
*pDest++ = c;
return pDestination;
}
} // namespace eastl
#endif // EASTL_CHAR_TRAITS_H
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