xmlscanner.cpp

来自「IBM的解析xml的工具Xerces的源代码」· C++ 代码 · 共 1,855 行 · 第 1/5 页

    if (XMLErrs::isFatal(toEmit) && fExitOnFirstFatal && !fInException)
        return true;
    return false;
}

void XMLScanner::emitError(const XMLErrs::Codes toEmit)
{
    // Bump the error count if it is not a warning
    if (XMLErrs::errorType(toEmit) != XMLErrorReporter::ErrType_Warning)
        incrementErrorCount();

    if (fErrorReporter)
    {
        // Load the message into a local for display
        const unsigned int msgSize = 1023;
        XMLCh errText[msgSize + 1];

        if (!gScannerMsgLoader().loadMsg(toEmit, errText, msgSize))
        {
                // <TBD> Probably should load a default msg here
        }

        //  Create a LastExtEntityInfo structure and get the reader manager
        //  to fill it in for us. This will give us the information about
        //  the last reader on the stack that was an external entity of some
        //  sort (i.e. it will ignore internal entities.
        ReaderMgr::LastExtEntityInfo lastInfo;
        fReaderMgr.getLastExtEntityInfo(lastInfo);

        fErrorReporter->error
        (
            toEmit
            , XMLUni::fgXMLErrDomain
            , XMLErrs::errorType(toEmit)
            , errText
            , lastInfo.systemId
            , lastInfo.publicId
            , lastInfo.lineNumber
            , lastInfo.colNumber
        );
    }

    // Bail out if its fatal an we are to give up on the first fatal error
    if (emitErrorWillThrowException(toEmit))
        throw toEmit;
}

void XMLScanner::emitError( const   XMLErrs::Codes    toEmit
                            , const XMLCh* const        text1
                            , const XMLCh* const        text2
                            , const XMLCh* const        text3
                            , const XMLCh* const        text4)
{
    // Bump the error count if it is not a warning
    if (XMLErrs::errorType(toEmit) != XMLErrorReporter::ErrType_Warning)
        incrementErrorCount();

    if (fErrorReporter)
    {
        //  Load the message into alocal and replace any tokens found in
        //  the text.
        const unsigned int maxChars = 2047;
        XMLCh errText[maxChars + 1];

        if (!gScannerMsgLoader().loadMsg(toEmit, errText, maxChars, text1, text2, text3, text4, fMemoryManager))
        {
                // <TBD> Should probably load a default message here
        }

        //  Create a LastExtEntityInfo structure and get the reader manager
        //  to fill it in for us. This will give us the information about
        //  the last reader on the stack that was an external entity of some
        //  sort (i.e. it will ignore internal entities.
        ReaderMgr::LastExtEntityInfo lastInfo;
        fReaderMgr.getLastExtEntityInfo(lastInfo);

        fErrorReporter->error
        (
            toEmit
            , XMLUni::fgXMLErrDomain
            , XMLErrs::errorType(toEmit)
            , errText
            , lastInfo.systemId
            , lastInfo.publicId
            , lastInfo.lineNumber
            , lastInfo.colNumber
        );
    }

    // Bail out if its fatal an we are to give up on the first fatal error
    if (emitErrorWillThrowException(toEmit))
        throw toEmit;
}

void XMLScanner::emitError( const   XMLErrs::Codes    toEmit
                            , const char* const         text1
                            , const char* const         text2
                            , const char* const         text3
                            , const char* const         text4)
{
    // Bump the error count if it is not a warning
    if (XMLErrs::errorType(toEmit) != XMLErrorReporter::ErrType_Warning)
        incrementErrorCount();

    if (fErrorReporter)
    {
        //  Load the message into alocal and replace any tokens found in
        //  the text.
        const unsigned int maxChars = 2047;
        XMLCh errText[maxChars + 1];

        if (!gScannerMsgLoader().loadMsg(toEmit, errText, maxChars, text1, text2, text3, text4, fMemoryManager))
        {
                // <TBD> Should probably load a default message here
        }

        //  Create a LastExtEntityInfo structure and get the reader manager
        //  to fill it in for us. This will give us the information about
        //  the last reader on the stack that was an external entity of some
        //  sort (i.e. it will ignore internal entities.
        ReaderMgr::LastExtEntityInfo lastInfo;
        fReaderMgr.getLastExtEntityInfo(lastInfo);

        fErrorReporter->error
        (
            toEmit
            , XMLUni::fgXMLErrDomain
            , XMLErrs::errorType(toEmit)
            , errText
            , lastInfo.systemId
            , lastInfo.publicId
            , lastInfo.lineNumber
            , lastInfo.colNumber
        );
    }

    // Bail out if its fatal an we are to give up on the first fatal error
    if (emitErrorWillThrowException(toEmit))
        throw toEmit;
}


// ---------------------------------------------------------------------------
//  XMLScanner: Getter methods
// ---------------------------------------------------------------------------

//  This method allows the caller to query the current location of the scanner.
//  It will return the sys/public ids of the current entity, and the line/col
//  position within it.
//
//  NOTE: This API returns the location with the last external file. So if its
//  currently scanning an entity, the position returned will be the end of
//  the entity reference in the file that had the reference.
//
/*bool
XMLScanner::getLastExtLocation(         XMLCh* const    sysIdToFill
                                , const unsigned int    maxSysIdChars
                                ,       XMLCh* const    pubIdToFill
                                , const unsigned int    maxPubIdChars
                                ,       XMLSSize_t&     lineToFill
                                ,       XMLSSize_t&     colToFill) const
{
    // Create a local info object and get it filled in by the reader manager
    ReaderMgr::LastExtEntityInfo lastInfo;
    fReaderMgr.getLastExtEntityInfo(lastInfo);

    // Fill in the line and column number
    lineToFill = lastInfo.lineNumber;
    colToFill = lastInfo.colNumber;

    // And copy over as much of the ids as will fit
    sysIdToFill[0] = 0;
    if (lastInfo.systemId)
    {
        if (XMLString::stringLen(lastInfo.systemId) > maxSysIdChars)
            return false;
        XMLString::copyString(sysIdToFill, lastInfo.systemId);
    }

    pubIdToFill[0] = 0;
    if (lastInfo.publicId)
    {
        if (XMLString::stringLen(lastInfo.publicId) > maxPubIdChars)
            return false;
        XMLString::copyString(pubIdToFill, lastInfo.publicId);
    }
    return true;
}*/


// ---------------------------------------------------------------------------
//  XMLScanner: Private scanning methods
// ---------------------------------------------------------------------------

//  This method is called after the end of the root element, to handle
//  any miscellaneous stuff hanging around.
void XMLScanner::scanMiscellaneous()
{
    // Get a buffer for this work
    XMLBufBid bbCData(&fBufMgr);

    while (true)
    {
        try
        {
            const XMLCh nextCh = fReaderMgr.peekNextChar();

            // Watch for end of file and break out
            if (!nextCh)
                break;

            if (nextCh == chOpenAngle)
            {
                if (checkXMLDecl(true))
                {
                    // Can't have an XML decl here
                    emitError(XMLErrs::NotValidAfterContent);
                    fReaderMgr.skipPastChar(chCloseAngle);
                }
                else if (fReaderMgr.skippedString(XMLUni::fgPIString))
                {
                    scanPI();
                }
                 else if (fReaderMgr.skippedString(XMLUni::fgCommentString))
                {
                    scanComment();
                }
                else
                {
                    // This can't be possible, so just give up
                    emitError(XMLErrs::ExpectedCommentOrPI);
                    fReaderMgr.skipPastChar(chCloseAngle);
                }
            }
            else if (fReaderMgr.getCurrentReader()->isWhitespace(nextCh))
            {
                //  If we have a doc handler, then gather up the spaces and
                //  call back. Otherwise, just skip over whitespace.
                if (fDocHandler)
                {
                    fReaderMgr.getSpaces(bbCData.getBuffer());
                    fDocHandler->ignorableWhitespace
                    (
                        bbCData.getRawBuffer()
                        , bbCData.getLen()
                        , false
                    );
                }
                else
                {
                    fReaderMgr.skipPastSpaces();
                }
            }
            else
            {
                emitError(XMLErrs::ExpectedCommentOrPI);
                fReaderMgr.skipPastChar(chCloseAngle);
            }
        }
        catch(const EndOfEntityException&)
        {
            //  Some entity leaked out of the content part of the document. Issue
            //  a warning and keep going.
            emitError(XMLErrs::EntityPropogated);
        }
    }
}


//  Scans a PI and calls the appropriate callbacks. At entry we have just
//  scanned the <? part, and need to now start on the PI target name.
void XMLScanner::scanPI()
{
    const XMLCh* namePtr = 0;
    const XMLCh* targetPtr = 0;

    //  If there are any spaces here, then warn about it. If we aren't in
    //  'first error' mode, then we'll come back and can easily pick up
    //  again by just skipping them.
    if (fReaderMgr.lookingAtSpace())
    {
        emitError(XMLErrs::PINameExpected);
        fReaderMgr.skipPastSpaces();
    }

    // Get a buffer for the PI name and scan it in
    XMLBufBid bbName(&fBufMgr);
    if (!fReaderMgr.getName(bbName.getBuffer()))
    {
        emitError(XMLErrs::PINameExpected);
        fReaderMgr.skipPastChar(chCloseAngle);
        return;
    }

    // Point the name pointer at the raw data
    namePtr = bbName.getRawBuffer();

    // See if it is some form of 'xml' and emit a warning
    if (!XMLString::compareIString(namePtr, XMLUni::fgXMLString))
        emitError(XMLErrs::NoPIStartsWithXML);

    // If namespaces are enabled, then no colons allowed
    if (fDoNamespaces)
    {
        if (XMLString::indexOf(namePtr, chColon) != -1)
            emitError(XMLErrs::ColonNotLegalWithNS);
    }

    //  If we don't hit a space next, then the PI has no target. If we do
    //  then get out the target. Get a buffer for it as well
    XMLBufBid bbTarget(&fBufMgr);
    if (fReaderMgr.skippedSpace())
    {
        // Skip any leading spaces
        fReaderMgr.skipPastSpaces();

        bool gotLeadingSurrogate = false;

        // It does have a target, so lets move on to deal with that.
        while (1)
        {
            const XMLCh nextCh = fReaderMgr.getNextChar();

            // Watch for an end of file, which is always bad here
            if (!nextCh)
            {
                emitError(XMLErrs::UnterminatedPI);
                ThrowXMLwithMemMgr(UnexpectedEOFException, XMLExcepts::Gen_UnexpectedEOF, fMemoryManager);
            }

            // Watch for potential terminating character
            if (nextCh == chQuestion)
            {
                // It must be followed by '>' to be a termination of the target
                if (fReaderMgr.skippedChar(chCloseAngle))
                    break;
            }

            // Check for correct surrogate pairs
            if ((nextCh >= 0xD800) && (nextCh <= 0xDBFF))
            {
                if (gotLeadingSurrogate)
                    emitError(XMLErrs::Expected2ndSurrogateChar);
                else
                    gotLeadingSurrogate = true;
            }
             else
            {
                if (gotLeadingSurrogate)
                {
                    if ((nextCh < 0xDC00) || (nextCh > 0xDFFF))
                        emitError(XMLErrs::Expected2ndSurrogateChar);
                }
                // Its got to at least be a valid XML character
                else if (!fReaderMgr.getCurrentReader()->isXMLChar(nextCh)) {

                    XMLCh tmpBuf[9];
                    XMLString::binToText
                    (
                        nextCh
                        , tmpBuf
                        , 8
                        , 16
                        , fMemoryManager
                    );
                    emitError(XMLErrs::InvalidCharacter, tmpBuf);
                }

                gotLeadingSurrogate = false;
            }