C++ TPtrC::LocateF方法代码示例

inline TBool IsAdaptiveFindMatchClassic( const TDesC& aItemString, const TDesC& aSearchText )
    {
    TPtrC itemptr = aItemString;
    TPtrC searchptr = aSearchText;

    TBool match = EFalse;
    
    for(;;) 
        {
        // Loop invariant: itemptr is next character from ' ' or '-'
        // Loop invariant: seachptr is at beginning of searched item
    
        TInt val = MyFindC(itemptr,searchptr);
        if (val == 0)
            {
            match = ETrue;
            break;
            }
        if (val != KErrNotFound && IsFindWordSeparator(itemptr[val-1]))
            {
            match = ETrue;
            break;
            }

        // find the word separator characters from list item
        TInt spacepos = itemptr.LocateF(TChar(' '));
        TInt minuspos = itemptr.LocateF(TChar('-'));
        TInt tabpos = itemptr.LocateF(TChar('\t'));
        if (spacepos != KErrNotFound)
            {
            itemptr.Set(itemptr.Mid(spacepos+1));
            }
        else if (minuspos != KErrNotFound)
            {
            itemptr.Set(itemptr.Mid(minuspos+1));
            }
        else if (tabpos != KErrNotFound)
            {
            itemptr.Set(itemptr.Mid(tabpos+1));
            }
        else
            {
            match = EFalse;
            break;
            }
        if (itemptr.Length() == 0)
            {
            match = EFalse;
            break;
            }

        }
    return match;
    }	

TInt CSwisExpressionEnvironment::ExtractNextToken(TPtrC& aTokenString, TPtrC& aParseString)
	{
	TInt separatorPosition = aParseString.LocateF(',');
	
	// Check that a separator was located within the parse string
	if(separatorPosition == KErrNotFound || separatorPosition > aParseString.Length()-1)
		{
		return KErrNotFound;
		}
	
	// Set the extracted token string and remove the token from the parse string
	aTokenString.Set(aParseString.Left(separatorPosition));
	aParseString.Set(aParseString.Mid(separatorPosition+1));
	
	return KErrNone;
	}

/**
Search algorithm for searching e-mail addresses

@param aText Text that will be parsed
@return ETrue if any EMail items were found else returns EFalse
@leave KErrNone, if successful; otherwise one of the other system-wide error codes.
@panic ETulPanicDescriptorLength in debug build if item's position 
and/or length is out of the document's range.
*/
TBool CTulAddressStringTokenizer::SearchMailAddressL( const TDesC& aText )
    {
    TInt searchStart = 0;
    TInt searchResult = 0;
    const TInt end = aText.Length(); // end of document

    do
        {
        TPtrC segment = aText.Right( end - searchStart );
        searchResult = segment.LocateF('@');

        if (searchResult != KErrNotFound)
            { // @ found
            // There should be valid characters (not a period) before and after the @ character
            if ( searchResult == 0 // first char
                || (searchResult >= segment.Length() - 1) // last char 
                || !(IsValidEmailChar(segment[searchResult - 1])) 
                || !(IsValidEmailHostChar(segment[searchResult + 1]))
                || segment[searchResult - 1] == '.' 
                || segment[searchResult + 1] == '.'
               )
                {
                searchStart += searchResult + 1;
                continue;
                }

            TBool wasPeriod = EFalse; // To prevent sequential periods
            // Get TLex from the pointer to get a better API for parsing
            TLexMark startPos;
            TLexMark endPos;
            TLex token = segment;
            
            // Go to searchResult and un-get until the beginning of e-mail address is reached
            token.Inc( searchResult );
            token.Mark();
            do
                {
                token.UnGet();
                if ( token.Peek() == '.' )
                    { // If it was a period
                    if (wasPeriod)	// and if the former was also -> break
                        break;
                    else	// else mark that this one was a period
                        wasPeriod = ETrue;
                    }
                else
                    wasPeriod = EFalse;
                }
            while (token.Offset() > 0 && IsValidEmailChar(token.Peek()));
            
            if (token.Offset() != 0 || !IsValidEmailChar(token.Peek()))
                token.Inc();

            // Get rid of periods from the start of address
            // Does it have to start with a number or char(abc...).
            // If it does, the loop should check that it gets rid of all special chars also.
            while (token.Peek() == '.')
                token.Inc();

            token.Mark( startPos ); // Mark the beginning of address
            token.UnGetToMark();
            wasPeriod = EFalse;
            
            do	// Go forward until a nonvalid character
                {
                token.Inc();
                if ( token.Peek() == '.' )
                    { // If it was a period
                    if ( wasPeriod )	// and if the former was also -> break
                        break;
                    else	// else mark that this one was a period
                        wasPeriod = ETrue;
                    }
                else
                    wasPeriod = EFalse;
                }
            while ( !token.Eos() && IsValidEmailHostChar( token.Peek() ) );
            
            // If address ends with a period take it away
            token.UnGet();
            if (token.Peek() != '.')
                token.Inc();

            token.Mark( endPos ); // Mark the beginning of address

            // Append the found string to the array
            __ASSERT_DEBUG( searchStart + token.MarkedOffset( startPos ) 
                            + token.MarkedOffset( endPos ) 
                            - token.MarkedOffset( startPos ) <= aText.Length(), 
                            Panic(ETulPanicDescriptorLength) );
            AddItemL( searchStart + token.MarkedOffset( startPos ), 
//.........这里部分代码省略.........