Introduce codemodelbackend process and library

This is a partial result of wip/clang-oop. More will follow.

This allows us to invoke the completion out of the Qt Creator process
and thus safes us as against libclang crashes.

At this point only the completion use case is supported.

Some notes on the individual components:

 src/libs/codemodelbackendipc
  * library encapsulating the inter process communication handling
  * used by the backend application and in a follow-up change by the
    creator integration

 src/libs/3rdparty/sqlite
  * version 3.8.10.2
  * dependency of codemodelbackendipc, will be used to storage indexing
    data, among others

 src/tools/codemodelbackend
  * the backend application

 tests/unit:
  * unit tests

Change-Id: I91a48e27467581a22fb760a18d8eb926008fea60
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

src/libs/sqlite/utf8string.cpp

@@ -0,0 +1,255 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing
+**
+** This file is part of Qt Creator.
+**
+** 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://www.qt.io/licensing.  For further information
+** use the contact form at http://www.qt.io/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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** 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 "utf8string.h"
+
+#include "utf8stringvector.h"
+
+#include <QString>
+#include <QDebug>
+
+#ifdef QT_TESTLIB_LIB
+#include <QTest>
+#endif
+
+#include <QDataStream>
+
+#include <ostream>
+
+Utf8String::Utf8String(const char *utf8Text, int size)
+    : byteArray(utf8Text, size)
+{
+}
+
+Utf8String::Utf8String(const QString &text)
+    : byteArray(text.toUtf8())
+{
+}
+
+const char *Utf8String::constData() const
+{
+    return byteArray.constData();
+}
+
+int Utf8String::byteSize() const
+{
+    return byteArray.size();
+}
+
+Utf8String Utf8String::fromUtf8(const char *utf8Text)
+{
+    return Utf8String(utf8Text, -1);
+}
+
+Utf8String::Utf8String(const QByteArray &utf8ByteArray)
+    : byteArray(utf8ByteArray)
+{
+}
+
+Utf8String Utf8String::fromByteArray(const QByteArray &utf8ByteArray)
+{
+    return Utf8String(utf8ByteArray);
+}
+
+const QByteArray &Utf8String::toByteArray() const
+{
+    return byteArray;
+}
+
+Utf8String Utf8String::fromString(const QString &text)
+{
+    return Utf8String::fromByteArray(text.toUtf8());
+}
+
+QString Utf8String::toString() const
+{
+    return QString::fromUtf8(byteArray, byteArray.size());
+}
+
+Utf8String Utf8String::mid(int position, int length) const
+{
+    return Utf8String(byteArray.mid(position, length));
+}
+
+void Utf8String::replace(const Utf8String &before, const Utf8String &after)
+{
+    byteArray.replace(before.byteArray, after.byteArray);
+}
+
+Utf8StringVector Utf8String::split(char separator) const
+{
+    Utf8StringVector utf8Vector;
+
+    foreach (const QByteArray &byteArray, byteArray.split(separator))
+        utf8Vector.append(Utf8String::fromByteArray(byteArray));
+
+   return utf8Vector;
+}
+
+void Utf8String::clear()
+{
+    byteArray.clear();
+}
+
+void Utf8String::append(const Utf8String &textToAppend)
+{
+    byteArray.append(textToAppend.byteArray);
+}
+
+bool Utf8String::contains(const Utf8String &text) const
+{
+    return byteArray.contains(text.byteArray);
+}
+
+bool Utf8String::contains(const char *text) const
+{
+    return byteArray.contains(text);
+}
+
+bool Utf8String::contains(char character) const
+{
+    return byteArray.contains(character);
+}
+
+bool Utf8String::startsWith(const Utf8String &text) const
+{
+    return byteArray.startsWith(text.byteArray);
+}
+
+bool Utf8String::startsWith(const char *text) const
+{
+    return byteArray.startsWith(text);
+}
+
+bool Utf8String::startsWith(char character) const
+{
+    return byteArray.startsWith(character);
+}
+
+bool Utf8String::isEmpty() const
+{
+    return byteArray.isEmpty();
+}
+
+bool Utf8String::hasContent() const
+{
+    return !isEmpty();
+}
+
+void Utf8String::reserve(int reserveSize)
+{
+    byteArray.reserve(reserveSize);
+}
+
+Utf8String Utf8String::number(int number, int base)
+{
+    return Utf8String::fromByteArray(QByteArray::number(number, base));
+}
+
+const Utf8String &Utf8String::operator+=(const Utf8String &text)
+{
+    byteArray += text.byteArray;
+
+    return *this;
+}
+
+void Utf8String::registerType()
+{
+    qRegisterMetaType<Utf8String>("Utf8String");
+}
+
+Utf8String::operator const QByteArray &() const
+{
+    return byteArray;
+}
+
+Utf8String::operator QString() const
+{
+    return toString();
+}
+
+const Utf8String operator +(const Utf8String &first, const Utf8String &second)
+{
+    return Utf8String(first.byteArray + second.byteArray);
+}
+
+
+bool operator !=(const Utf8String &first, const Utf8String &second)
+{
+    return first.byteArray != second.byteArray;
+}
+
+
+bool operator ==(const Utf8String &first, const Utf8String &second)
+{
+    return first.byteArray == second.byteArray;
+}
+
+bool operator ==(const Utf8String &first, const char *second)
+{
+    return first.byteArray == second;
+}
+
+bool operator <(const Utf8String &first, const Utf8String &second)
+{
+    if (first.byteSize() == second.byteSize())
+        return first.byteArray < second.byteArray;
+
+    return first.byteSize() < second.byteSize();
+}
+
+
+QDataStream &operator<<(QDataStream &datastream, const Utf8String &text)
+{
+    datastream << text.byteArray;
+
+    return datastream;
+}
+
+
+QDataStream &operator>>(QDataStream &datastream, Utf8String &text)
+{
+    datastream >> text.byteArray;
+
+    return datastream;
+}
+
+
+QDebug operator<<(QDebug debug, const Utf8String &text)
+{
+    debug << text.constData();
+
+    return debug;
+}
+
+void PrintTo(const Utf8String &text, ::std::ostream* os)
+{
+    *os << "\"" << text.toByteArray().data() << "\"";
+}