Simple parse
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#ifndef HANDLER_H
#define HANDLER_H
#include <qstring.h>
#include <qxml.h>
class Handler : public QXmlDefaultHandler
{
public:
bool startDocument();
bool startElement(const QString &, const QString &, const QString &qName,
const QXmlAttributes &);
bool endElement(const QString &, const QString &, const QString &);
bool fatalError(const QXmlParseException &exception);
QStringList& names();
QList<int>& indentations();
private:
int indentationLevel;
QStringList elementName;
QList<int> elementIndentation;
};
#endif
/*
handler.cpp
Provides a handler for processing XML elements found by the reader.
The handler stores the names of elements it finds and their indentation
levels. The indentation level is initially set to zero.
When a starting element is found, the indentation level is increased;
when an ending element is found, the indentation level is decreased.
*/
#include <QDebug>
#include "handler.h"
/*!
Reset the state of the handler to ensure that new documents are
read correctly.
We return true to indicate that parsing should continue.
*/
bool Handler::startDocument()
{
elementName.clear();
elementIndentation.clear();
indentationLevel = 0;
return true;
}
/*!
Process each starting element in the XML document.
Append the element name to the list of elements found; add its
corresponding indentation level to the list of indentation levels.
Increase the level of indentation by one column.
We return true to indicate that parsing should continue.
*/
bool Handler::startElement(const QString &, const QString &,
const QString & qName, const QXmlAttributes &)
{
elementName.append(qName);
elementIndentation.append(indentationLevel);
indentationLevel += 1;
return true;
}
/*!
Process each ending element in the XML document.
Decrease the level of indentation by one column.
We return true to indicate that parsing should continue.
*/
bool Handler::endElement(const QString &, const QString &,
const QString &)
{
indentationLevel -= 1;
return true;
}
/*!
Report a fatal parsing error, and return false to indicate to the reader
that parsing should stop.
*/
bool Handler::fatalError (const QXmlParseException & exception)
{
qWarning() << QString("Fatal error on line %1, column %2: %3").arg(
exception.lineNumber()).arg(exception.columnNumber()).arg(
exception.message());
return false;
}
/*!
Return the list of element names found.
*/
QStringList& Handler::names ()
{
return elementName;
}
/*!
Return the list of indentations used for each element found.
*/
QList<int>& Handler::indentations ()
{
return elementIndentation;
}
#include <qfile.h>
#include <qxml.h>
#include "handler.h"
#include <iostream>
int main(int argc, char **argv)
{
if (argc != 2) {
std::cout << "Usage: " << argv[0] << " <filename>" << std::endl;
return 1;
}
QFile *file = new QFile(argv[1]);
QXmlSimpleReader xmlReader;
QXmlInputSource *source = new QXmlInputSource(file);
Handler *handler = new Handler;
xmlReader.setContentHandler(handler);
xmlReader.setErrorHandler(handler);
bool ok = xmlReader.parse(source);
if (!ok)
std::cout << "Parsing failed." << std::endl;
else {
QStringList names = handler->names();
QList<int> indentations = handler->indentations();
int items = names.count();
for (int i = 0; i < items; ++i) {
for (int j = 0; j < indentations[i]; ++j)
std::cout << " ";
std::cout << names[i].toLocal8Bit().constData() << std::endl;
}
}
return 0;
}
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