C++ TiXmlNode::StreamIn方法代码示例

void TiXmlDocument::StreamIn( std::istream * in, TIXML_STRING * tag )
{
	// The basic issue with a document is that we don't know what we're
	// streaming. Read something presumed to be a tag (and hope), then
	// identify it, and call the appropriate stream method on the tag.
	//
	// This "pre-streaming" will never read the closing ">" so the
	// sub-tag can orient itself.

	if ( !StreamTo( in, '<', tag ) ) 
	{
		SetError( TIXML_ERROR_PARSING_EMPTY, 0, 0, TIXML_ENCODING_UNKNOWN );
		return;
	}

	while ( in->good() )
	{
		int tagIndex = (int) tag->length();
		while ( in->good() && in->peek() != '>' )
		{
			int c = in->get();
			if ( c <= 0 )
			{
				SetError( TIXML_ERROR_EMBEDDED_NULL, 0, 0, TIXML_ENCODING_UNKNOWN );
				break;
			}
			(*tag) += (char) c;
		}

		if ( in->good() )
		{
			// We now have something we presume to be a node of 
			// some sort. Identify it, and call the node to
			// continue streaming.
			TiXmlNode* node = Identify( tag->c_str() + tagIndex, TIXML_DEFAULT_ENCODING );

			if ( node )
			{
				node->StreamIn( in, tag );
				bool isElement = node->ToElement() != 0;
				delete node;
				node = 0;

				// If this is the root element, we're done. Parsing will be
				// done by the >> operator.
				if ( isElement )
				{
					return;
				}
			}
			else
			{
				SetError( TIXML_ERROR, 0, 0, TIXML_ENCODING_UNKNOWN );
				return;
			}
		}
	}
	// We should have returned sooner.
	SetError( TIXML_ERROR, 0, 0, TIXML_ENCODING_UNKNOWN );
}

void TiXmlElement::StreamIn (TIXML_ISTREAM * in, TIXML_STRING * tag)
{
    // We're called with some amount of pre-parsing. That is, some of "this"
    // element is in "tag". Go ahead and stream to the closing ">"
    while( in->good() )
    {
        int c = in->get();
        (*tag) += (char) c ;

        if ( c == '>' )
            break;
    }

    if ( tag->length() < 3 ) return;

    // Okay...if we are a "/>" tag, then we're done. We've read a complete tag.
    // If not, identify and stream.

    if (    tag->at( tag->length() - 1 ) == '>'
            && tag->at( tag->length() - 2 ) == '/' )
    {
        // All good!
        return;
    }
    else if ( tag->at( tag->length() - 1 ) == '>' )
    {
        // There is more. Could be:
        //		text
        //		closing tag
        //		another node.
        for ( ;; )
        {
            StreamWhiteSpace( in, tag );

            // Do we have text?
            if ( in->good() && in->peek() != '<' )
            {
                // Yep, text.
                TiXmlText text( "" );
                text.StreamIn( in, tag );

                // What follows text is a closing tag or another node.
                // Go around again and figure it out.
                continue;
            }

            // We now have either a closing tag...or another node.
            // We should be at a "<", regardless.
            if ( !in->good() ) return;
            assert( in->peek() == '<' );
            int tagIndex = tag->length();

            bool closingTag = false;
            bool firstCharFound = false;

            for( ;; )
            {
                if ( !in->good() )
                    return;

                int c = in->peek();

                if ( c == '>' )
                    break;

                *tag += c;
                in->get();

                if ( !firstCharFound && c != '<' && !IsWhiteSpace( c ) )
                {
                    firstCharFound = true;
                    if ( c == '/' )
                        closingTag = true;
                }
            }
            // If it was a closing tag, then read in the closing '>' to clean up the input stream.
            // If it was not, the streaming will be done by the tag.
            if ( closingTag )
            {
                int c = in->get();
                assert( c == '>' );
                *tag += c;

                // We are done, once we've found our closing tag.
                return;
            }
            else
            {
                // If not a closing tag, id it, and stream.
                const char* tagloc = tag->c_str() + tagIndex;
                TiXmlNode* node = Identify( tagloc );
                if ( !node )
                    return;
                node->StreamIn( in, tag );
                delete node;
                node = 0;

                // No return: go around from the beginning: text, closing tag, or node.
            }
        }
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