source-engine/tier1/splitstring.cpp

//========= Copyright Valve Corporation, All rights reserved. ============//
//
//
//
//==================================================================================================

#include "strtools.h"
#include "utlvector.h"

CSplitString::CSplitString(const char *pString, const char **pSeparators, int nSeparators)
{
	Construct(pString, pSeparators, nSeparators);
};

CSplitString::CSplitString( const char *pString, const char *pSeparator)
{
	Construct( pString, &pSeparator, 1 );
}

CSplitString::~CSplitString()
{
	if(m_szBuffer)
		delete [] m_szBuffer;
}

void CSplitString::Construct( const char *pString, const char **pSeparators, int nSeparators )
{
	//////////////////////////////////////////////////////////////////////////
	// make a duplicate of the original string. We'll use pieces of this duplicate to tokenize the string
	// and create NULL-terminated tokens of the original string
	//
	int nOriginalStringLength = V_strlen(pString);
	m_szBuffer = new char[nOriginalStringLength + 1];
	memcpy(m_szBuffer, pString, nOriginalStringLength + 1);

	this->Purge();
	const char *pCurPos = pString;
	while ( 1 )
	{
		int iFirstSeparator = -1;
		const char *pFirstSeparator = 0;
		for ( int i=0; i < nSeparators; i++ )
		{
			const char *pTest = V_stristr( pCurPos, pSeparators[i] );
			if ( pTest && (!pFirstSeparator || pTest < pFirstSeparator) )
			{
				iFirstSeparator = i;
				pFirstSeparator = pTest;
			}
		}

		if ( pFirstSeparator )
		{
			// Split on this separator and continue on.
			int separatorLen = strlen( pSeparators[iFirstSeparator] );
			if ( pFirstSeparator > pCurPos )
			{
				//////////////////////////////////////////////////////////////////////////
				/// Cut the token out of the duplicate string
				char *pTokenInDuplicate = m_szBuffer + (pCurPos - pString);
				int nTokenLength = pFirstSeparator-pCurPos;
				Assert(nTokenLength > 0 && !memcmp(pTokenInDuplicate,pCurPos,nTokenLength));
				pTokenInDuplicate[nTokenLength] = '\0';

				this->AddToTail( pTokenInDuplicate /*AllocString( pCurPos, pFirstSeparator-pCurPos )*/ );
			}

			pCurPos = pFirstSeparator + separatorLen;
		}
		else
		{
			// Copy the rest of the string
			int nTokenLength = strlen( pCurPos );
			if ( nTokenLength )
			{
				//////////////////////////////////////////////////////////////////////////
				// There's no need to cut this token, because there's no separator after it.
				// just add its copy in the buffer to the tail
				char *pTokenInDuplicate = m_szBuffer + (pCurPos - pString);
				Assert(!memcmp(pTokenInDuplicate, pCurPos, nTokenLength));

				this->AddToTail( pTokenInDuplicate/*AllocString( pCurPos, -1 )*/ );
			}
			return;
		}
	}
}

void CSplitString::PurgeAndDeleteElements()
{
	Purge();
}