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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://www.qt.io
**
** This file is part of Qt Enterprise Embedded.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://www.qt.io
**
****************************************************************************/
#include "portlist.h"
#include <QList>
#include <QPair>
#include <QString>
#include <cctype>
namespace Utils {
namespace Internal {
namespace {
typedef QPair<int, int> Range;
class PortsSpecParser
{
struct ParseException {
ParseException(const char *error) : error(error) {}
const char * const error;
};
public:
PortsSpecParser(const QString &portsSpec)
: m_pos(0), m_portsSpec(portsSpec) { }
/*
* Grammar: Spec -> [ ElemList ]
* ElemList -> Elem [ ',' ElemList ]
* Elem -> Port [ '-' Port ]
*/
bool parse()
{
if (!atEnd()) {
if (!parseElemList()) {
qWarning("Malformed ports specification");
return false;
}
}
return true;
}
const PortList &portList() const
{
return m_portList;
}
private:
bool parseElemList()
{
if (atEnd()) {
qWarning("Element list empty.");
return false;
}
if (!parseElem())
return false;
if (atEnd())
return true;
if (nextChar() != ',') {
qWarning("Element followed by something else than a comma.");
return false;
}
++m_pos;
return parseElemList();
}
bool parseElem()
{
const int startPort = parsePort();
if (startPort < 0)
return false;
if (atEnd() || nextChar() != '-') {
m_portList.addPort(startPort);
return true;
}
++m_pos;
const int endPort = parsePort();
if (endPort < 0)
return false;
if (endPort < startPort) {
qWarning("Invalid range (end < start).");
return false;
}
m_portList.addRange(startPort, endPort);
return true;
}
int parsePort()
{
if (atEnd()) {
qWarning("Empty port string.");
return -1;
}
int port = 0;
do {
const char next = nextChar();
if (!std::isdigit(next))
break;
port = 10*port + next - '0';
++m_pos;
} while (!atEnd());
if (port == 0 || port >= 2 << 16) {
qWarning("Invalid port value.");
return -1;
}
return port;
}
bool atEnd() const { return m_pos == m_portsSpec.length(); }
char nextChar() const { return m_portsSpec.at(m_pos).toLatin1(); }
PortList m_portList;
int m_pos;
const QString &m_portsSpec;
};
} // anonymous namespace
class PortListPrivate
{
public:
QList<Range> ranges;
};
} // namespace Internal
PortList::PortList() : d(new Internal::PortListPrivate)
{
}
PortList::PortList(const PortList &other) : d(new Internal::PortListPrivate(*other.d))
{
}
PortList::~PortList()
{
delete d;
}
PortList &PortList::operator=(const PortList &other)
{
*d = *other.d;
return *this;
}
PortList PortList::fromString(const QString &portsSpec)
{
Internal::PortsSpecParser p(portsSpec);
if (!p.parse()) {
qWarning("Could not parse string");
}
return p.portList();
}
void PortList::addPort(int port) { addRange(port, port); }
void PortList::addRange(int startPort, int endPort)
{
d->ranges << Internal::Range(startPort, endPort);
}
bool PortList::hasMore() const { return !d->ranges.isEmpty(); }
bool PortList::contains(int port) const
{
foreach (const Internal::Range &r, d->ranges) {
if (port >= r.first && port <= r.second)
return true;
}
return false;
}
int PortList::count() const
{
int n = 0;
foreach (const Internal::Range &r, d->ranges)
n += r.second - r.first + 1;
return n;
}
int PortList::getNext()
{
Q_ASSERT(!d->ranges.isEmpty());
Internal::Range &firstRange = d->ranges.first();
const int next = firstRange.first++;
if (firstRange.first > firstRange.second)
d->ranges.removeFirst();
return next;
}
QString PortList::toString() const
{
QString stringRep;
foreach (const Internal::Range &range, d->ranges) {
stringRep += QString::number(range.first);
if (range.second != range.first)
stringRep += QLatin1Char('-') + QString::number(range.second);
stringRep += QLatin1Char(',');
}
if (!stringRep.isEmpty())
stringRep.remove(stringRep.length() - 1, 1); // Trailing comma.
return stringRep;
}
QString PortList::regularExpression()
{
const QLatin1String portExpr("(\\d)+");
const QString listElemExpr = QString::fromLatin1("%1(-%1)?").arg(portExpr);
return QString::fromLatin1("((%1)(,%1)*)?").arg(listElemExpr);
}
} // namespace Utils
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