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#include <qxml.h>
#include <qregexp.h>

#include "parser.h"

class ContentHandler : public QXmlDefaultHandler
{
    public:
	ContentHandler();

	// QXmlContentHandler methods
	bool startDocument();
	bool endDocument();
	bool startElement(const QString &namespaceURI,
			    const QString &localName,
			    const QString &qName,
			    const QXmlAttributes & atts);
	bool endElement(const QString &namespaceURI,
			    const QString &localName,
			    const QString &qName);
	bool characters(const QString &ch);
	void setDocumentLocator(QXmlLocator *locator);
	bool startPrefixMapping (const QString &prefix, const QString & uri);
	bool endPrefixMapping(const QString &prefix);
	bool ignorableWhitespace (const QString & ch);
	bool processingInstruction(const QString &target, const QString &data);
	bool skippedEntity (const QString & name);

	// QXmlErrorHandler methods
	bool warning (const QXmlParseException & exception);
	bool error (const QXmlParseException & exception);
	bool fatalError (const QXmlParseException & exception);

	// QXmlDTDHandler methods
	bool notationDecl ( const QString & name, const QString & publicId,
				const QString & systemId );
	bool unparsedEntityDecl ( const QString & name,
				    const QString & publicId,
				    const QString & systemId,
				    const QString & notationName );

	// QXmlEntityResolver methods
	bool resolveEntity ( const QString & publicId,
				const QString & systemId,
				QXmlInputSource *&);

	// QXmlLexicalHandler methods
	bool startDTD ( const QString & name, const QString & publicId, const QString & systemId );
	bool endDTD ();
	bool startEntity ( const QString & name );
	bool endEntity ( const QString & name );
	bool startCDATA ();
	bool endCDATA ();
	bool comment ( const QString & ch );

	// QXmlDeclHandler methods
	bool attributeDecl ( const QString & eName, const QString & aName, const QString & type, const QString & valueDefault, const QString & value );
	bool internalEntityDecl ( const QString & name, const QString & value );
	bool externalEntityDecl ( const QString & name, const QString & publicId, const QString & systemId );


	const QString &result() const { return m_result; }
        const QString &errorMsg() const { return m_error_msg; }
        
    private:
        QString nestPrefix() const { return QString().fill(' ', 3*m_nest); }
	QString formatAttributes(const QXmlAttributes & atts);
	QString escapeStr(const QString &s);

	unsigned m_nest;
	QString m_result, m_error_msg;
};

ContentHandler::ContentHandler()
{
    m_nest = 0;
}


bool ContentHandler::startDocument()
{
    m_result += nestPrefix();
    m_result += "startDocument()\n";
    ++m_nest;
    return TRUE;
}

bool ContentHandler::endDocument()
{
    --m_nest;
    m_result += nestPrefix();
    m_result += "endDocument()\n";
    return TRUE;
}

bool ContentHandler::startElement(const QString &namespaceURI,
				    const QString &localName,
				    const QString &qName,
				    const QXmlAttributes & atts)
{
    m_result += nestPrefix();
    m_result += "startElement(namespaceURI=\"" + escapeStr(namespaceURI)
		+ "\", localName=\"" + escapeStr(localName)
		+ "\", qName=\"" + escapeStr(qName)
		+ "\", atts=[" + formatAttributes(atts) + "])\n";
    ++m_nest;
    return TRUE;
}

QString ContentHandler::escapeStr(const QString &s)
{
    QString result = s;
    result.replace(QRegExp("\""), "\\\"");
    result.replace(QRegExp("\\"), "\\\\");
    result.replace(QRegExp("\n"), "\\n");
    result.replace(QRegExp("\r"), "\\r");
    result.replace(QRegExp("\t"), "\\t");
    return result;
}

QString ContentHandler::formatAttributes(const QXmlAttributes &atts)
{
    QString result;
    for (int i = 0, cnt = atts.count(); i < cnt; ++i) {
	if (i != 0) result += ", ";
	result += "{localName=\"" + escapeStr(atts.localName(i))
		    + "\", qName=\"" + escapeStr(atts.qName(i))
		    + "\", uri=\"" + escapeStr(atts.uri(i))
		    + "\", type=\"" + escapeStr(atts.type(i))
		    + "\", value=\"" + escapeStr(atts.value(i)) + "\"}";
    }
    return result;
}

bool ContentHandler::endElement(const QString &namespaceURI,
				const QString &localName,
				const QString &qName)
{
    --m_nest;
    m_result += nestPrefix();
    m_result += "endElement(namespaceURI=\"" + escapeStr(namespaceURI)
		+ "\", localName=\"" + escapeStr(localName)
		+ "\", qName=\"" + escapeStr(qName) + "\")\n";
    return TRUE;
}

bool ContentHandler::characters(const QString &ch)
{
    m_result += nestPrefix();
    m_result += "characters(ch=\"" + escapeStr(ch) + "\")\n";
    return TRUE;
}

void ContentHandler::setDocumentLocator(QXmlLocator *locator)
{
    m_result += nestPrefix();
    m_result += "setDocumentLocator(locator={columnNumber="
		+ QString::number(locator->columnNumber())
		+ ", lineNumber=" + QString::number(locator->lineNumber())
		+ "})\n";
}

bool ContentHandler::startPrefixMapping (const QString &prefix, const QString & uri)
{
    m_result += nestPrefix();
    m_result += "startPrefixMapping(prefix=\"" + escapeStr(prefix)
		    + "\", uri=\"" + escapeStr(uri) + "\")\n";
    ++m_nest;
    return TRUE;
}

bool ContentHandler::endPrefixMapping(const QString &prefix)
{
    --m_nest;
    m_result += nestPrefix();
    m_result += "endPrefixMapping(prefix=\"" + escapeStr(prefix) + "\")\n";
    return TRUE;
}

bool ContentHandler::ignorableWhitespace(const QString & ch)
{
    m_result += nestPrefix();
    m_result += "ignorableWhitespace(ch=\"" + escapeStr(ch) + "\")\n";
    return TRUE;
}

bool ContentHandler::processingInstruction(const QString &target, const QString &data)
{
    m_result += nestPrefix();
    m_result += "processingInstruction(target=\"" + escapeStr(target)
		+ "\", data=\"" + escapeStr(data) + "\")\n";
    return TRUE;
}

bool ContentHandler::skippedEntity (const QString & name)
{
    m_result += nestPrefix();
    m_result += "skippedEntity(name=\"" + escapeStr(name) + "\")\n";
    return TRUE;
}

bool ContentHandler::warning(const QXmlParseException & exception)
{
    m_error_msg = QString("Warning %1:%2: %3")
                    .arg(exception.columnNumber())
                    .arg(exception.lineNumber())
                    .arg(exception.message());
    m_result += nestPrefix();
    m_result += "warning(exception={columnNumber="
		    + QString::number(exception.columnNumber())
		    + ", lineNumber="
		    + QString::number(exception.lineNumber())
		    + ", publicId=\"" + escapeStr(exception.publicId())
		    + "\", systemId=\"" + escapeStr(exception.systemId())
		    + "\", message=\"" + escapeStr(exception.message())
		    + "\"})\n";
    return TRUE;
}

bool ContentHandler::error(const QXmlParseException & exception)
{
    m_error_msg = QString("Error %1:%2: %3")
                    .arg(exception.columnNumber())
                    .arg(exception.lineNumber())
                    .arg(exception.message());
    m_result += nestPrefix();
    m_result += "error(exception={columnNumber="
		    + QString::number(exception.columnNumber())
		    + ", lineNumber="
		    + QString::number(exception.lineNumber())
		    + ", publicId=\"" + escapeStr(exception.publicId())
		    + "\", systemId=\"" + escapeStr(exception.systemId())
		    + "\", message=\"" + escapeStr(exception.message())
		    + "\"})\n";
    return TRUE;
}

bool ContentHandler::fatalError(const QXmlParseException & exception)
{
    m_error_msg = QString("Fatal error %1:%2: %3")
                    .arg(exception.columnNumber())
                    .arg(exception.lineNumber())
                    .arg(exception.message());
    m_result += nestPrefix();
    m_result += "fatalError(exception={columnNumber="
		    + QString::number(exception.columnNumber())
		    + ", lineNumber="
		    + QString::number(exception.lineNumber())
		    + ", publicId=\"" + escapeStr(exception.publicId())
		    + "\", systemId=\"" + escapeStr(exception.systemId())
		    + "\", message=\"" + escapeStr(exception.message())
		    + "\"})\n";
    return TRUE;
}

bool ContentHandler::notationDecl ( const QString & name,
				    const QString & publicId,
				    const QString & systemId )
{
    m_result += nestPrefix();
    m_result += "notationDecl(name=\"" + escapeStr(name) + "\", publicId=\""
		    + escapeStr(publicId) + "\", systemId=\""
		    + escapeStr(systemId) + "\")\n";
    return TRUE;
}

bool ContentHandler::unparsedEntityDecl ( const QString & name,
					    const QString & publicId,
					    const QString & systemId,
					    const QString & notationName )
{
    m_result += nestPrefix();
    m_result += "unparsedEntityDecl(name=\"" + escapeStr(name)
		    + "\", publicId=\"" + escapeStr(publicId)
		    + "\", systemId=\"" + escapeStr(systemId)
		    + "\", notationName=\"" + escapeStr(notationName)
		    + "\")\n";
    return TRUE;
}

bool ContentHandler::resolveEntity(const QString & publicId,
				    const QString & systemId,
				    QXmlInputSource *&)
{
    m_result += nestPrefix();
    m_result += "resolveEntity(publicId=\"" + escapeStr(publicId)
		    + "\", systemId=\"" + escapeStr(systemId)
		    + "\", ret={})\n";
    return TRUE;
}

bool ContentHandler::startDTD ( const QString & name, const QString & publicId, const QString & systemId )
{
    m_result += nestPrefix();
    m_result += "startDTD(name=\"" + escapeStr(name)
		    + "\", publicId=\"" + escapeStr(publicId)
		    + "\", systemId=\"" + escapeStr(systemId) + "\")\n";
    ++m_nest;
    return TRUE;
}

bool ContentHandler::endDTD ()
{
    --m_nest;
    m_result += nestPrefix();
    m_result += "endDTD()\n";
    return TRUE;
}

bool ContentHandler::startEntity ( const QString & name )
{
    m_result += nestPrefix();
    m_result += "startEntity(name=\"" + escapeStr(name) + "\")\n";
    ++m_nest;
    return TRUE;
}

bool ContentHandler::endEntity ( const QString & name )
{
    --m_nest;
    m_result += nestPrefix();
    m_result += "endEntity(name=\"" + escapeStr(name) + "\")\n";
    return TRUE;
}

bool ContentHandler::startCDATA ()
{
    m_result += nestPrefix();
    m_result += "startCDATA()\n";
    ++m_nest;
    return TRUE;
}

bool ContentHandler::endCDATA ()
{
    --m_nest;
    m_result += nestPrefix();
    m_result += "endCDATA()\n";
    return TRUE;
}

bool ContentHandler::comment ( const QString & ch )
{
    m_result += nestPrefix();
    m_result += "comment(ch=\"" + escapeStr(ch) + "\")\n";
    return TRUE;
}

bool ContentHandler::attributeDecl ( const QString & eName,
					const QString & aName,
					const QString & type,
					const QString & valueDefault,
					const QString & value )
{
    m_result += nestPrefix();
    m_result += "attributeDecl(eName=\"" + escapeStr(eName) + "\", aName=\""
		+ escapeStr(aName) + "\", type=\"" + escapeStr(type)
		+ "\", valueDefault=\"" + escapeStr(valueDefault)
		+ "\", value=\"" + escapeStr(value) + "\")\n";
    return TRUE;
}

bool ContentHandler::internalEntityDecl ( const QString & name,
					    const QString & value )
{
    m_result += nestPrefix();
    m_result += "internatlEntityDecl(name=\"" + escapeStr(name)
		    + "\", value=\"" + escapeStr(value) + "\")\n";
    return TRUE;
}

bool ContentHandler::externalEntityDecl ( const QString & name,
					    const QString & publicId,
					    const QString & systemId )
{
    m_result += nestPrefix();
    m_result += "externalEntityDecl(name=\"" + escapeStr(name)
		    + "\", publicId=\"" + escapeStr(publicId)
		    + "\", systemId=\"" + escapeStr(systemId) + "\")\n";
    return TRUE;
}

Parser::Parser()
{
    handler = new ContentHandler;
    setContentHandler(handler);
    setDTDHandler(handler);
    setDeclHandler(handler);
    setEntityResolver(handler);
    setErrorHandler(handler);
    setLexicalHandler(handler);
}

Parser::~Parser()
{
    delete handler;
}

bool Parser::parseFile(QFile *file)
{
    QXmlInputSource source(file);
    return parse(source);
}

QString Parser::result() const
{
    return handler->result();
}

QString Parser::errorMsg() const
{
    return handler->errorMsg();
}
