tstring.cpp

包中TMap

#include "TString.h"
#include <memory.h>
	
int T_afxInitData[] = { -1, 0, 0, 0 };	
TStringData* T_afxDataNil = (TStringData*)&T_afxInitData;
TLPCTSTR T_afxPchNil = (TLPCTSTR)(((TBYTE*)&T_afxInitData)+sizeof(TStringData));
const TString& TAfxGetEmptyString()
{ 
	return *(TString*)&T_afxPchNil; 
}

char TafxChNil = '\0';

// constructs empty TString
TString::TString()
{
	Init();
}

// copy constructor
TString::TString(const TString& stringSrc)
{
	assert(stringSrc.GetData()->nRefs != 0); //ASSERT->assert
	if (stringSrc.GetData()->nRefs >= 0)
	{
		assert(stringSrc.GetData() != T_afxDataNil); //ASSERT->assert
		m_pchData = stringSrc.m_pchData;
		//InterlockedIncrement(&GetData()->nRefs);
		GetData()->nRefs++; //要求加锁???
	}
	else
	{
		Init();
		*this = stringSrc.m_pchData;
	}
}

// from a single character
TString::TString( char ch, int nLength ) //Param2-nRepeat
{
	Init();
	if (nLength >= 1)
	{
		AllocBuffer(nLength);
//#ifdef _UNICODE
//		for (int i = 0; i < nLength; i++)
//			m_pchData[i] = ch;
//#else
		memset(m_pchData, ch, nLength);
//#endif
	}
}

// from an ANSI string (converts to TCHAR)
TString::TString( TLPCTSTR lpsz )
{
	Init();
	//if (lpsz != NULL && HIWORD(lpsz) == NULL)
	//{
	//	UINT nID = LOWORD((DWORD)lpsz);
	//	if (!LoadString(nID))
	//		TRACE1("Warning: implicit LoadString(%u) failed\n", nID);
	//}
	//else
	{
		int nLen = SafeStrlen(lpsz);
		if (nLen != 0)
		{
			AllocBuffer(nLen);
			memcpy(m_pchData, lpsz, nLen*sizeof(char));
		}
	}
}	

// subset of characters from an ANSI string (converts to TCHAR)
TString::TString(TLPCSTR lpch, int nLength)
{
	Init();
	if (nLength != 0)
	{
		//ASSERT(AfxIsValidAddress(lpch, nLength, FALSE)); //检查指针的有效性
		assert(lpch!=NULL);
		AllocBuffer(nLength);
		memcpy(m_pchData, lpch, nLength*sizeof(char));
	}
}

// clear contents to empty
void TString::Empty()
{
	if (GetData()->nDataLength == 0)
		return;
	if (GetData()->nRefs >= 0)
		Release();
	else
		*this = &TafxChNil;
	assert(GetData()->nDataLength == 0);
	assert(GetData()->nRefs < 0 || GetData()->nAllocLength == 0);
}

// set a single character at zero-based index
void TString::SetAt(int nIndex, char ch)
{
	assert(nIndex >= 0);
	assert(nIndex < GetData()->nDataLength);

	CopyBeforeWrite();
	m_pchData[nIndex] = ch;
}

// overloaded assignment=======================

// ref-counted copy from another CString
const TString& TString::operator=(const TString& stringSrc)
{
	if (m_pchData != stringSrc.m_pchData)
	{
		if ((GetData()->nRefs < 0 && GetData() != T_afxDataNil) ||
			stringSrc.GetData()->nRefs < 0)
		{
			// actual copy necessary since one of the strings is locked
			AssignCopy(stringSrc.GetData()->nDataLength, stringSrc.m_pchData);
		}
		else
		{
			// can just copy references around
			Release();
			assert(stringSrc.GetData() != T_afxDataNil);
			m_pchData = stringSrc.m_pchData;
			//InterlockedIncrement(&GetData()->nRefs);
			GetData()->nRefs++; //修改之前加锁
		}
	}
	return *this;
}

// set string content to single character
const TString& TString::operator=(char ch)
{
	AssignCopy(1, &ch);
	return *this;
}

// copy string content from ANSI string (converts to TCHAR)
const TString& TString::operator=(TLPCSTR lpsz)
{
	//assert(lpsz == NULL || AfxIsValidString(lpsz));
	AssignCopy(SafeStrlen(lpsz), lpsz);
	return *this;
}

// string concatenation==========================

// concatenate from another CString
const TString& TString::operator+=(const TString& string)
{
	ConcatInPlace(string.GetData()->nDataLength, string.m_pchData);
	return *this;
}

// concatenate a single character
const TString& TString::operator+=(char ch)
{
	ConcatInPlace(1, &ch);
	return *this;
}

// concatenate a UNICODE character after converting it to TCHAR
const TString& TString::operator+=(TLPCTSTR lpsz)
{
	//ASSERT(lpsz == NULL || AfxIsValidString(lpsz));
	ConcatInPlace(SafeStrlen(lpsz), lpsz);
	return *this;
}

//////////////////////////////////////////////////////////////////////////////
// concatenation

// NOTE: "operator+" is done as friend functions for simplicity
//      There are three variants:
//          CString + CString
// and for ? = TCHAR, LPCTSTR
//          CString + ?
//          ? + CString

TString operator+(const TString& string1,const TString& string2)
{
	TString s;
	s.ConcatCopy(string1.GetData()->nDataLength, string1.m_pchData,
		string2.GetData()->nDataLength, string2.m_pchData);
	return s;
}

TString operator+(const TString& string1, char ch)
{
	TString s;
	s.ConcatCopy(string1.GetData()->nDataLength, string1.m_pchData, 1, &ch);
	return s;
}

TString operator+(char ch, const TString& string)
{
	TString s;
	s.ConcatCopy(1, &ch, string.GetData()->nDataLength, string.m_pchData);
	return s;
}

TString operator+(const TString& string, TLPCTSTR lpsz)
{
	//ASSERT(lpsz == NULL || AfxIsValidString(lpsz));
	TString s;
	s.ConcatCopy(string.GetData()->nDataLength, string.m_pchData,
		TString::SafeStrlen(lpsz), lpsz);
	return s;
}

TString operator+(TLPCTSTR lpsz, const TString& string)
{
	//ASSERT(lpsz == NULL || AfxIsValidString(lpsz));
	TString s;
	s.ConcatCopy(TString::SafeStrlen(lpsz), lpsz, string.GetData()->nDataLength,
		string.m_pchData);
	return s;
}

// simple sub-string extraction==================================

// return nCount characters starting at zero-based nFirst
TString TString::Mid(int nFirst, int nCount) const
{
	// out-of-bounds requests return sensible things
	if (nFirst < 0)
		nFirst = 0;
	if (nCount < 0)
		nCount = 0;

	if (nFirst + nCount > GetData()->nDataLength)
		nCount = GetData()->nDataLength - nFirst;
	if (nFirst > GetData()->nDataLength)
		nCount = 0;

	assert(nFirst >= 0);
	assert(nFirst + nCount <= GetData()->nDataLength);

	// optimize case of returning entire string
	if (nFirst == 0 && nFirst + nCount == GetData()->nDataLength)
		return *this;

	TString dest;
	AllocCopy(dest, nCount, nFirst, 0);
	return dest;
}

// return all characters starting at zero-based nFirst
TString TString::Mid(int nFirst) const
{
	return Mid(nFirst, GetData()->nDataLength - nFirst);
}

// return first nCount characters in string
TString TString::Left(int nCount) const
{
	if (nCount < 0)
		nCount = 0;
	if (nCount >= GetData()->nDataLength)
		return *this;

	TString dest;
	AllocCopy(dest, nCount, 0, 0);
	return dest;
}

// return nCount characters from end of string
TString TString::Right(int nCount) const
{
	if (nCount < 0)
		nCount = 0;
	if (nCount >= GetData()->nDataLength)
		return *this;

	TString dest;
	AllocCopy(dest, nCount, GetData()->nDataLength-nCount, 0);
	return dest;
}

//  characters from beginning that are also in passed string
// strspn equivalent
TString TString::SpanIncluding(TLPCTSTR lpszCharSet) const
{
	//ASSERT(AfxIsValidString(lpszCharSet));
	//return Left(_tcsspn(m_pchData, lpszCharSet));
	return TString("");
}
// characters from beginning that are not also in passed string
// strcspn equivalent
TString TString::SpanExcluding(TLPCTSTR lpszCharSet) const
{
	//ASSERT(AfxIsValidString(lpszCharSet));
	//return Left(_tcscspn(m_pchData, lpszCharSet));
	return TString("");
}

// upper/lower/reverse conversion===================
// NLS aware conversion to uppercase
void TString::MakeUpper()	//等待改造???
{
	CopyBeforeWrite();
	//_tcsupr(m_pchData);
}

// NLS aware conversion to lowercase
void TString::MakeLower()	//等待改造???
{
	CopyBeforeWrite();
	//_tcslwr(m_pchData);
}

// reverse string right-to-left
void TString::MakeReverse()	//等待改造???
{
	CopyBeforeWrite();
	//_tcsrev(m_pchData);
}

// trimming whitespace (either side)==============================
// remove whitespace starting from right edge
void TString::TrimRight()
{
	// find beginning of trailing spaces by starting at beginning (DBCS aware)
return;
/*	CopyBeforeWrite();
	TLPTSTR lpsz = m_pchData;
	TLPTSTR lpszLast = NULL;

	while (*lpsz != '\0')
	{
		if (_istspace(*lpsz))
		{
			if (lpszLast == NULL)
				lpszLast = lpsz;
		}
		else
			lpszLast = NULL;
		lpsz = _tcsinc(lpsz);
	}

	if (lpszLast != NULL)
	{
		// truncate at trailing space start
		*lpszLast = '\0';
		GetData()->nDataLength = lpszLast - m_pchData;
	}*/
}

// remove whitespace starting from left side
void TString::TrimLeft()
{
	// find first non-space character
return;
/*	CopyBeforeWrite();
	TLPCTSTR lpsz = m_pchData;

	while (_istspace(*lpsz))
		lpsz = _tcsinc(lpsz);

	if (lpsz != m_pchData)
	{
		// fix up data and length
		int nDataLength = GetData()->nDataLength - (lpsz - m_pchData);
		memmove(m_pchData, lpsz, (nDataLength+1)*sizeof(TCHAR));
		GetData()->nDataLength = nDataLength;
	}
	*/
}

	// trimming anything (either side)=======

// remove continuous occurrences of chTarget starting from right
void TString::TrimRight(char chTarget)
{
	// find beginning of trailing matches
	// by starting at beginning (DBCS aware)
return;
/*	CopyBeforeWrite();
	LPTSTR lpsz = m_pchData;
	LPTSTR lpszLast = NULL;