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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "portlist.h"
#include <QPair>
#include <QString>
#include <cctype>
namespace Utils {
namespace Internal {
namespace {
using Range = QPair<Port, Port>;
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 ]
*/
PortList parse()
{
try {
if (!atEnd())
parseElemList();
} catch (const ParseException &e) {
qWarning("Malformed ports specification: %s", e.error);
}
return m_portList;
}
private:
void parseElemList()
{
if (atEnd())
throw ParseException("Element list empty.");
parseElem();
if (atEnd())
return;
if (nextChar() != ',') {
throw ParseException("Element followed by something else "
"than a comma.");
}
++m_pos;
parseElemList();
}
void parseElem()
{
const Port startPort = parsePort();
if (atEnd() || nextChar() != '-') {
m_portList.addPort(startPort);
return;
}
++m_pos;
const Port endPort = parsePort();
if (endPort < startPort)
throw ParseException("Invalid range (end < start).");
m_portList.addRange(startPort, endPort);
}
Port parsePort()
{
if (atEnd())
throw ParseException("Empty port string.");
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)
throw ParseException("Invalid port value.");
return Port(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)
{
return Internal::PortsSpecParser(portsSpec).parse();
}
void PortList::addPort(Port port) { addRange(port, port); }
void PortList::addRange(Port startPort, Port endPort)
{
d->ranges << Internal::Range(startPort, endPort);
}
bool PortList::hasMore() const { return !d->ranges.isEmpty(); }
bool PortList::contains(Port port) const
{
for (const Internal::Range &r : std::as_const(d->ranges)) {
if (port >= r.first && port <= r.second)
return true;
}
return false;
}
int PortList::count() const
{
int n = 0;
for (const Internal::Range &r : std::as_const(d->ranges))
n += r.second.number() - r.first.number() + 1;
return n;
}
Port PortList::getNext()
{
Q_ASSERT(!d->ranges.isEmpty());
Internal::Range &firstRange = d->ranges.first();
const Port next = firstRange.first;
firstRange.first = Port(firstRange.first.number() + 1);
if (firstRange.first > firstRange.second)
d->ranges.removeFirst();
return next;
}
Port PortList::getNextFreePort(const QList<Port> &usedPorts)
{
while (hasMore()) {
const Port port = getNext();
if (!usedPorts.contains(port))
return port;
}
return {};
}
QString PortList::toString() const
{
QString stringRep;
for (const Internal::Range &range : std::as_const(d->ranges)) {
stringRep += QString::number(range.first.number());
if (range.second != range.first)
stringRep += QLatin1Char('-') + QString::number(range.second.number());
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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