Move Qt profile setup into a dedicated library.

Otherwise all changes to the implementation will have to be duplicated
in IDEs.

Change-Id: I61e6d4fa1ee9b724eb5d9de9f233dc915a6c8bc3
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

1 files changed, 324 insertions, 0 deletions

diff --git a/src/lib/corelib/tools/id.cpp b/src/lib/corelib/tools/id.cpp
new file mode 100644
index 000000000..a9dc07cbc
--- /dev/null
+++ b/src/lib/corelib/tools/id.cpp
@@ -0,0 +1,324 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Build Suite.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "id.h"
+#include "qbsassert.h"
+
+#include <QByteArray>
+#include <QHash>
+#include <QVector>
+
+namespace qbs {
+namespace Internal {
+
+/*!
+    \class qbs::Internal::Id
+
+    \brief The class Id encapsulates an identifier that is unique
+    within a specific running process, using the qbs library.
+
+    \c{Id} is used as facility to identify objects of interest
+    in a more typesafe and faster manner than a plain \c QString or
+    \c QByteArray would provide.
+
+    An id is internally represented as a 32 bit integer (its \c UID)
+    and associated with a plain 7-bit-clean ASCII name used
+    for display and persistency.
+
+    This class is copied from Qt Creator.
+*/
+
+class StringHolder
+{
+public:
+    StringHolder()
+        : n(0), str(0)
+    {}
+
+    StringHolder(const char *s, int length)
+        : n(length), str(s)
+    {
+        if (!n)
+            length = n = qstrlen(s);
+        h = 0;
+        while (length--) {
+            h = (h << 4) + *s++;
+            h ^= (h & 0xf0000000) >> 23;
+            h &= 0x0fffffff;
+        }
+    }
+    int n;
+    const char *str;
+    uint h;
+};
+
+static bool operator==(const StringHolder &sh1, const StringHolder &sh2)
+{
+    // sh.n is unlikely to discriminate better than the hash.
+    return sh1.h == sh2.h && sh1.str && sh2.str && strcmp(sh1.str, sh2.str) == 0;
+}
+
+
+static uint qHash(const StringHolder &sh)
+{
+    return sh.h;
+}
+
+struct IdCache : public QHash<StringHolder, int>
+{
+#ifndef QBS_ALLOW_STATIC_LEAKS
+    ~IdCache()
+    {
+        for (IdCache::iterator it = begin(); it != end(); ++it)
+            delete[](const_cast<char *>(it.key().str));
+    }
+#endif
+};
+
+
+static int firstUnusedId = Id::IdsPerPlugin * Id::ReservedPlugins;
+
+static QHash<int, StringHolder> stringFromId;
+static IdCache idFromString;
+
+static int theId(const char *str, int n = 0)
+{
+    QBS_ASSERT(str && *str, return 0);
+    StringHolder sh(str, n);
+    int res = idFromString.value(sh, 0);
+    if (res == 0) {
+        res = firstUnusedId++;
+        sh.str = qstrdup(sh.str);
+        idFromString[sh] = res;
+        stringFromId[res] = sh;
+    }
+    return res;
+}
+
+static int theId(const QByteArray &ba)
+{
+    return theId(ba.constData(), ba.size());
+}
+
+/*!
+    \fn qbs::Internal::Id(int uid)
+
+    \brief Constructs an id given a UID.
+
+    The UID is an integer value that is unique within the running
+    process.
+
+    It is the callers responsibility to ensure the uniqueness of
+    the passed integer. The recommended approach is to use
+    \c{registerId()} with an value taken from the plugin's
+    private range.
+
+    \sa registerId()
+
+*/
+
+/*!
+    Constructs an id given its associated name. The internal
+    representation will be unspecified, but consistent within a
+    process.
+
+*/
+Id::Id(const char *name)
+    : m_id(theId(name, 0))
+{}
+
+/*!
+    \overload
+
+*/
+Id::Id(const QByteArray &name)
+   : m_id(theId(name))
+{}
+
+///*!
+//    \overload
+//    \deprecated
+//*/
+//Id::Id(const QString &name)
+//   : m_id(theId(name.toUtf8()))
+//{}
+
+/*!
+  Returns an internal representation of the id.
+*/
+
+QByteArray Id::name() const
+{
+    return stringFromId.value(m_id).str;
+}
+
+/*!
+  Returns a string representation of the id suitable
+  for UI display.
+
+  This should not be used to create a persistent version
+  of the Id, use \c{toSetting()} instead.
+
+  \sa fromString(), toSetting()
+*/
+
+QString Id::toString() const
+{
+    return QString::fromUtf8(stringFromId.value(m_id).str);
+}
+
+/*!
+  Creates an id from a string representation.
+
+  This should not be used to handle a persistent version
+  of the Id, use \c{fromSetting()} instead.
+
+  \deprecated
+
+  \sa toString(), fromSetting()
+*/
+
+Id Id::fromString(const QString &name)
+{
+    return Id(theId(name.toUtf8()));
+}
+
+/*!
+  Creates an id from a string representation.
+
+  This should not be used to handle a persistent version
+  of the Id, use \c{fromSetting()} instead.
+
+  \deprecated
+
+  \sa toString(), fromSetting()
+*/
+
+Id Id::fromName(const QByteArray &name)
+{
+    return Id(theId(name));
+}
+
+/*!
+  Returns a persistent value representing the id which is
+  suitable to be stored in QSettings.
+
+  \sa fromSetting()
+*/
+
+QVariant Id::toSetting() const
+{
+    return QVariant(QString::fromUtf8(stringFromId.value(m_id).str));
+}
+
+/*!
+  Reconstructs an id from a persistent value.
+
+  \sa toSetting()
+*/
+
+Id Id::fromSetting(const QVariant &variant)
+{
+    const QByteArray ba = variant.toString().toUtf8();
+    if (ba.isEmpty())
+        return Id();
+    return Id(theId(ba));
+}
+
+/*!
+  Constructs a derived id.
+
+  This can be used to construct groups of ids logically
+  belonging together. The associated internal name
+  will be generated by appending \c{suffix}.
+*/
+
+Id Id::withSuffix(int suffix) const
+{
+    const QByteArray ba = name() + QByteArray::number(suffix);
+    return Id(ba.constData());
+}
+
+/*!
+  \overload
+*/
+
+Id Id::withSuffix(const char *suffix) const
+{
+    const QByteArray ba = name() + suffix;
+    return Id(ba.constData());
+}
+
+/*!
+  Constructs a derived id.
+
+  This can be used to construct groups of ids logically
+  belonging together. The associated internal name
+  will be generated by prepending \c{prefix}.
+*/
+
+Id Id::withPrefix(const char *prefix) const
+{
+    const QByteArray ba = prefix + name();
+    return Id(ba.constData());
+}
+
+
+/*!
+  Associates a id with its uid and its string
+  representation.
+
+  The uid should be taken from the plugin's private range.
+
+  \sa fromSetting()
+*/
+
+void Id::registerId(int uid, const char *name)
+{
+    StringHolder sh(name, 0);
+    idFromString[sh] = uid;
+    stringFromId[uid] = sh;
+}
+
+bool Id::operator==(const char *name) const
+{
+    const char *string = stringFromId.value(m_id).str;
+    if (string && name)
+        return strcmp(string, name) == 0;
+    else
+        return false;
+}
+
+bool Id::alphabeticallyBefore(Id other) const
+{
+    return toString().compare(other.toString(), Qt::CaseInsensitive) < 0;
+}
+
+} // namespace Internal
+} // namespace qbs