vostring.cpp

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//-------------------------------------------------------------------
// VOString implementation file
//-------------------------------------------------------------------
// 
// Copyright ?000- 02 Virtual Office Systems Incorporated
// All Rights Reserved                      
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed unmodified by any means PROVIDING it is 
// not sold for profit without the authors written consent, and 
// providing that this notice and the authors name is included.
//
// This code can be compiled, modified and distributed freely, providing
// that this copyright information remains intact in the distribution.
//
// This code may be compiled in original or modified form in any private 
// or commercial application.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability for any damage, in any form, caused
// by this code. Use it at your own risk.
//-------------------------------------------------------------------

#include "stdafx.h"

#ifndef WIN32_PLATFORM_WFSP
#include <atlbase.h>
#endif

#include <tchar.h>
#include <stdarg.h>
#include "VOString.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CVOString::CVOString(LPCTSTR pcszValue)
{
	m_pBuffer = NULL;
	m_dwBufferSize = 0;

	*this = pcszValue;
}

// Copy Constructor
CVOString::CVOString(const CVOString &rSrc)
{
	m_pBuffer = NULL;
	m_dwBufferSize = 0;

	*this = rSrc.m_pBuffer;
}

CVOString::~CVOString()
{
	if(m_pBuffer)
		delete m_pBuffer;
}

void CVOString::operator = (const CVOString& rSrc)
{
	*this = rSrc.m_pBuffer;
}

void CVOString::operator = (LPCTSTR pcszValue)
{
	if(pcszValue == NULL)
	{
		m_dwLength = 0;
		if(m_pBuffer)
		{
			delete m_pBuffer;
			m_pBuffer = NULL;
		}
	}
	else
	{
		m_dwLength = _tcslen(pcszValue);

		SetMinBufferSize(m_dwLength);

		if(m_dwLength == 0)
		{
			m_pBuffer[0] = TCHAR(0);
		}
		else
			_tcscpy(m_pBuffer, pcszValue);
	}
}

#ifndef _UNICODE
#ifndef _DOS
void CVOString::operator =(LPCWSTR pcwszValue)
{
	if(!pcwszValue)
	{
		m_dwLength = 0;
		if(m_pBuffer)
		{
			delete m_pBuffer;
			m_pBuffer = NULL;
		}

		return;
	}

	if(sizeof(TCHAR) == sizeof(WCHAR))
	{
		m_dwLength = wcslen(pcwszValue);
		SetMinBufferSize(m_dwLength);
		wcscpy((LPWSTR)m_pBuffer, pcwszValue);
	}
	else
	{
		int		nChars = wcslen(pcwszValue) + 1;
		LPTSTR	pszBuffer = new TCHAR[nChars];

		for(int n = 0; n < nChars; n++)
			pszBuffer[n] = (TCHAR) pcwszValue[n];

		m_dwLength = _tcslen(pszBuffer);
		SetMinBufferSize(m_dwLength);
		_tcscpy(m_pBuffer, pszBuffer);

		delete pszBuffer;
	}
}
#endif
#endif

BOOL CVOString::operator == (LPCTSTR pcszValue) const
{
	if(!m_pBuffer)
	{
		if(!pcszValue)
			return TRUE;

		return (_tcsicmp(pcszValue, TEXT("")) == 0);
	}

	return(_tcsicmp(pcszValue, m_pBuffer) == 0);
}

BOOL CVOString::operator == (const CVOString& rCompare) const
{
	if(!m_pBuffer)
	{
		if(rCompare.GetLength() == 0)
			return TRUE;
		else
			return FALSE;
	}

	if(!rCompare.m_pBuffer)
		return FALSE;

	return(_tcsicmp(rCompare.m_pBuffer, m_pBuffer) == 0);
}

LPCTSTR CVOString::operator += (LPCTSTR pcszAppend)
{
	if(m_pBuffer)
	{
		SetMinBufferSize(GetLength() + _tcslen(pcszAppend));
		_tcscat(m_pBuffer, pcszAppend);
		m_dwLength = _tcslen(m_pBuffer);
	}
	else
		*this = pcszAppend;

	return *this;
}

LPCTSTR CVOString::operator += (TCHAR chAppend)
{
	SetMinBufferSize(m_dwLength + 2);
	m_dwLength++;
	m_pBuffer[m_dwLength] = 0;
	m_pBuffer[m_dwLength - 1] = chAppend;

	return *this;
}

CVOString CVOString::operator + (LPCTSTR pcszAppend)
{
	CVOString strReturn(*this);
	
	strReturn += pcszAppend;

	return strReturn;
}

BOOL CVOString::SetMinBufferSize(DWORD dwChars)
{
#ifdef _DEBUG
	if(dwChars > 65536)
		DebugBreak();	// This is just a precaution to protect against memory leaks.  Large strings are fine.
#endif
	if((m_dwBufferSize < dwChars + 1) || (m_pBuffer == NULL))
	{
		TCHAR*	pNewBuffer;
		DWORD	dwNewBufferSize = dwChars + 16;

		pNewBuffer = new TCHAR[dwNewBufferSize];

		memset(pNewBuffer, 0, sizeof(TCHAR) * dwNewBufferSize);

		if(m_pBuffer)
		{
			memmove(pNewBuffer, m_pBuffer, m_dwBufferSize * sizeof(TCHAR) );
			delete m_pBuffer;
		}

		m_pBuffer = pNewBuffer;

		m_dwBufferSize = dwNewBufferSize;
	}

	return TRUE;
}

TCHAR CVOString::GetAt(DWORD dwOffset) const
{
	if(dwOffset > m_dwLength - 1)
		return (TCHAR) 0;

	return m_pBuffer[dwOffset];
}

CVOString CVOString::Left(DWORD dwCount) const
{
	if(dwCount >= m_dwLength)
		return CVOString(*this);

	LPTSTR	pszTemp = new TCHAR[dwCount + 1];

	memset(pszTemp, 0, sizeof(TCHAR) * (dwCount + 1));
	memmove(pszTemp, m_pBuffer, sizeof(TCHAR) * dwCount);

	CVOString strValue(pszTemp);

	delete pszTemp;

	return strValue;
}

CVOString CVOString::Mid(DWORD dwOffset, int nLength) const
{
	if(dwOffset < 0 || dwOffset > m_dwLength)
		return CVOString(TEXT(""));

	if(nLength == -1)
		nLength = m_dwLength - dwOffset;
	else if(dwOffset + nLength > m_dwLength)
		nLength = m_dwLength - dwOffset;

	LPTSTR	pszTemp = new TCHAR[nLength + 1];

	memset(pszTemp, 0, sizeof(TCHAR) * (nLength + 1));
	memmove(pszTemp, m_pBuffer + dwOffset, sizeof(TCHAR) * nLength);

	CVOString strValue(pszTemp);

	delete pszTemp;

	return strValue;
}

LPTSTR CVOString::GetBuffer(DWORD dwMinSize)
{
	SetMinBufferSize(dwMinSize + 1);

	return m_pBuffer;
}

int CVOString::Format(LPCTSTR pcszFormat, ...)
{
    va_list vl;

    va_start( vl, pcszFormat);
              
	::wvsprintf(GetBuffer(2048), pcszFormat, vl);
	ReleaseBuffer();

	va_end(vl);

	return GetLength();
}

int CVOString::Find(LPCTSTR pcszValue, int nStartingOffset) const
{
	LPTSTR pszSubstring;
	
	if(nStartingOffset < 0)
		nStartingOffset = 0;

	pszSubstring = _tcsstr(m_pBuffer + nStartingOffset, pcszValue);

	if(!pszSubstring)
		return -1;

	return (pszSubstring - m_pBuffer);
}

int CVOString::Find(TCHAR chValue, int nStartingOffset) const
{
	TCHAR pcszValue[2];

	pcszValue[0] = chValue;
	pcszValue[1] = 0;

	return Find(pcszValue, nStartingOffset);
}

int CVOString::ReverseFind(LPCTSTR pcszSubstring) const
{
	int nOffset = -1, nNextOffset = 0;

	while((nNextOffset = Find(pcszSubstring, nNextOffset)) != -1)
		nOffset = nNextOffset++;

	return nOffset;
}

DWORD CVOString::ReleaseBuffer(int nChars)
{
	if((m_pBuffer == NULL) || (m_dwBufferSize == 0))
		return 0;

	if(nChars == -1)
		m_dwLength = _tcslen(m_pBuffer);
	else
	{
		m_dwLength = (DWORD) nChars;

		if(m_dwLength > m_dwBufferSize)
			m_dwLength = m_dwBufferSize;

		m_pBuffer[m_dwLength] = 0;
	}

	return m_dwLength;
}

const CVOString& CVOString::TrimRight()
{
	while(GetLength() && GetAt(GetLength() - 1) == TCHAR(' '))
		*this = Left(GetLength() - 1);

	return *this;
}

const CVOString& CVOString::TrimLeft()
{
	while(GetLength() && GetAt(0) == TCHAR(' '))
		*this = Mid(1);

	return *this;
}

const CVOString& CVOString::Trim()
{
	TrimLeft();

	return TrimRight();
}

CVOString CVOString::Right(int nChars)
{
	if((int)GetLength() < nChars)
		return *this;

	return Mid(GetLength() - nChars);
}

void CVOString::MakeMixedCase()
{
	BOOL fNextCaps = TRUE;
	BOOL fFirstWord = TRUE;

	for(int i = 0; i < (int)GetLength(); i++)
	{
		if( (m_pBuffer[i] >= TCHAR('a') && m_pBuffer[i] <= TCHAR('z')) || 
			(m_pBuffer[i] >= TCHAR('A') && m_pBuffer[i] <= TCHAR('Z')) )	// Start of Word
		{
			int nWordEnd = i;

			while(	(m_pBuffer[nWordEnd] >= TCHAR('a') && m_pBuffer[nWordEnd] <= TCHAR('z')) ||
					(m_pBuffer[nWordEnd] >= TCHAR('A') && m_pBuffer[nWordEnd] <= TCHAR('Z')) )
				nWordEnd++;

			CVOString strWord;

			strWord = Mid(i, nWordEnd - i);
			strWord.MakeLower();

			BOOL fCapitalize = FALSE;

			if(fFirstWord)
			{
				fCapitalize = TRUE;
				fFirstWord = FALSE;
			}
			else
			{
				fCapitalize = TRUE;

				if(strWord == TEXT("a"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("an"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("the"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("and"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("but"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("or"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("nor"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("at"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("by"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("for"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("from"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("in"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("into"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("of"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("off"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("on"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("onto"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("out"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("to"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("up"))
					fCapitalize = FALSE;
				else if(strWord == TEXT("with "))
					fCapitalize = FALSE;
			}

			if(fCapitalize)
				strWord.m_pBuffer[0] = strWord.m_pBuffer[0] - (TCHAR('a') - TCHAR('A'));

			memmove(m_pBuffer + i, strWord.m_pBuffer, strWord.GetLength() * sizeof(TCHAR));
			i = nWordEnd - 1;
		}
		else if(m_pBuffer[i] == TCHAR('.') || m_pBuffer[i] == TCHAR('?') || m_pBuffer[i] == TCHAR('!'))
			fFirstWord = TRUE;
	}
}

void CVOString::MakeLower()
{
	for(int i = 0; i < (int)GetLength(); i++)
	{
		if(m_pBuffer[i] >= TCHAR('A') && m_pBuffer[i] <= TCHAR('Z'))
			m_pBuffer[i] = m_pBuffer[i] + (TCHAR('a') - TCHAR('A'));