--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/scripttools/debugging/qscriptenginedebuggerfrontend.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,335 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtSCriptTools module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qscriptenginedebuggerfrontend_p.h"
+#include "qscriptdebuggerfrontend_p_p.h"
+#include "qscriptdebuggerbackend_p.h"
+#include "qscriptdebuggerbackend_p_p.h"
+#include "qscriptdebuggerevent_p.h"
+#include "qscriptdebuggercommandexecutor_p.h"
+#include "qscriptdebuggerresponse_p.h"
+
+#include <QtCore/qcoreapplication.h>
+#include <QtCore/qeventloop.h>
+#include <QtCore/qlist.h>
+#include <QtScript/qscriptvalue.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \class QScriptEngineDebuggerFrontend
+  \since 4.5
+  \internal
+
+  \brief The QScriptEngineDebuggerFrontend class provides an in-process debugger frontend.
+
+  This type of frontend is used when the QScriptEngine being debugged
+  lives in the same process as the debugger.
+
+  Call the attachTo() function to attach to an engine.
+*/
+
+class QScriptDebuggerCommandEvent : public QEvent
+{
+public:
+    QScriptDebuggerCommandEvent(int id, const QScriptDebuggerCommand &command)
+        : QEvent(QEvent::Type(QEvent::User+3)), m_id(id), m_command(command) {}
+    ~QScriptDebuggerCommandEvent() {}
+    int id() const
+        { return m_id; }
+    const QScriptDebuggerCommand &command() const
+        { return m_command; }
+private:
+    int m_id;
+    QScriptDebuggerCommand m_command;
+};
+
+class QScriptDebuggerCommandFinishedEvent : public QEvent
+{
+public:
+    QScriptDebuggerCommandFinishedEvent(int id, const QScriptDebuggerResponse &response)
+        : QEvent(QEvent::Type(QEvent::User+4)), m_id(id), m_response(response) {}
+    ~QScriptDebuggerCommandFinishedEvent() {}
+    int id() const
+        { return m_id; }
+    const QScriptDebuggerResponse &response() const
+        { return m_response; }
+private:
+    int m_id;
+    QScriptDebuggerResponse m_response;
+};
+
+class QScriptEngineDebuggerBackendPrivate;
+class QScriptEngineDebuggerBackend : public QScriptDebuggerBackend
+{
+public:
+    QScriptEngineDebuggerBackend(QScriptEngineDebuggerFrontendPrivate *frontend);
+    ~QScriptEngineDebuggerBackend();
+
+    void processCommand(int id, const QScriptDebuggerCommand &command);
+    void resume();
+
+protected:
+    void event(const QScriptDebuggerEvent &event);
+
+private:
+    Q_DECLARE_PRIVATE(QScriptEngineDebuggerBackend)
+    Q_DISABLE_COPY(QScriptEngineDebuggerBackend)
+};
+
+class QScriptEngineDebuggerBackendPrivate
+    : public QScriptDebuggerBackendPrivate
+{
+    Q_DECLARE_PUBLIC(QScriptEngineDebuggerBackend)
+public:
+    QScriptEngineDebuggerBackendPrivate();
+    ~QScriptEngineDebuggerBackendPrivate();
+
+    bool event(QEvent *e);
+
+    QScriptEngineDebuggerFrontendPrivate *frontend;
+    QList<QEventLoop*> eventLoopPool;
+    QList<QEventLoop*> eventLoopStack;
+};
+
+class QScriptEngineDebuggerFrontendPrivate
+    : public QScriptDebuggerFrontendPrivate
+{
+    Q_DECLARE_PUBLIC(QScriptEngineDebuggerFrontend)
+public:
+    QScriptEngineDebuggerFrontendPrivate();
+    ~QScriptEngineDebuggerFrontendPrivate();
+
+    void postCommandFinished(int id, const QScriptDebuggerResponse &response);
+    bool event(QEvent *e);
+
+    QScriptEngineDebuggerBackend *backend;
+};
+
+QScriptEngineDebuggerBackendPrivate::QScriptEngineDebuggerBackendPrivate()
+{
+    frontend = 0;
+}
+
+QScriptEngineDebuggerBackendPrivate::~QScriptEngineDebuggerBackendPrivate()
+{
+    eventLoopPool << eventLoopStack;
+    eventLoopStack.clear();
+    while (!eventLoopPool.isEmpty()) {
+        QEventLoop *eventLoop = eventLoopPool.takeFirst();
+        if (eventLoop->isRunning()) {
+            eventLoop->quit();
+            eventLoop->deleteLater();
+        } else {
+            delete eventLoop;
+        }
+    }
+}
+
+/*!
+  \reimp
+*/
+bool QScriptEngineDebuggerBackendPrivate::event(QEvent *e)
+{
+    Q_Q(QScriptEngineDebuggerBackend);
+    if (e->type() == QEvent::User+3) {
+        QScriptDebuggerCommandEvent *ce = static_cast<QScriptDebuggerCommandEvent*>(e);
+        QScriptDebuggerCommandExecutor *executor = q->commandExecutor();
+        QScriptDebuggerResponse response = executor->execute(q, ce->command());
+        frontend->postCommandFinished(ce->id(), response);
+        return true;
+    }
+    return QScriptDebuggerBackendPrivate::event(e);
+}
+
+/*!
+  \internal
+
+  Creates a new QScriptEngineDebuggerBackend object for the given \a
+  engine.  The back-end will forward events to the given \a frontend.
+*/
+QScriptEngineDebuggerBackend::QScriptEngineDebuggerBackend(
+    QScriptEngineDebuggerFrontendPrivate *frontend)
+    : QScriptDebuggerBackend(*new QScriptEngineDebuggerBackendPrivate)
+{
+    Q_D(QScriptEngineDebuggerBackend);
+    d->frontend = frontend;
+}
+
+QScriptEngineDebuggerBackend::~QScriptEngineDebuggerBackend()
+{
+}
+
+void QScriptEngineDebuggerBackend::processCommand(int id, const QScriptDebuggerCommand &command)
+{
+    Q_D(QScriptEngineDebuggerBackend);
+    d->postEvent(new QScriptDebuggerCommandEvent(id, command));
+}
+
+/*!
+  \reimp
+*/
+void QScriptEngineDebuggerBackend::event(const QScriptDebuggerEvent &event)
+{
+    Q_D(QScriptEngineDebuggerBackend);
+    if (d->eventLoopPool.isEmpty())
+        d->eventLoopPool.append(new QEventLoop());
+    QEventLoop *eventLoop = d->eventLoopPool.takeFirst();
+    Q_ASSERT(!eventLoop->isRunning());
+    d->eventLoopStack.prepend(eventLoop);
+
+    d->frontend->postEvent(new QScriptDebuggerEventEvent(event));
+
+    // Run an event loop until resume() is called.
+    // This effectively stalls script execution and makes it possible
+    // for the debugger to inspect the execution state in the meantime.
+    eventLoop->exec();
+
+    if (!d->eventLoopStack.isEmpty()) {
+        // the event loop was quit directly (i.e. not via resume())
+        d->eventLoopStack.takeFirst();
+    }
+    d->eventLoopPool.append(eventLoop);
+    doPendingEvaluate(/*postEvent=*/false);
+}
+
+/*!
+  \reimp
+*/
+void QScriptEngineDebuggerBackend::resume()
+{
+    Q_D(QScriptEngineDebuggerBackend);
+    // quitting the event loops will cause event() to return (see above)
+    while (!d->eventLoopStack.isEmpty()) {
+        QEventLoop *eventLoop = d->eventLoopStack.takeFirst();
+        if (eventLoop->isRunning())
+            eventLoop->quit();
+    }
+}
+
+QScriptEngineDebuggerFrontendPrivate::QScriptEngineDebuggerFrontendPrivate()
+{
+    backend = 0;
+}
+
+QScriptEngineDebuggerFrontendPrivate::~QScriptEngineDebuggerFrontendPrivate()
+{
+    delete backend;
+}
+
+void QScriptEngineDebuggerFrontendPrivate::postCommandFinished(
+    int id, const QScriptDebuggerResponse &response)
+{
+    postEvent(new QScriptDebuggerCommandFinishedEvent(id, response));
+}
+
+/*!
+  \reimp
+*/
+bool QScriptEngineDebuggerFrontendPrivate::event(QEvent *e)
+{
+    Q_Q(QScriptEngineDebuggerFrontend);
+    if (e->type() == QEvent::User+4) {
+        QScriptDebuggerCommandFinishedEvent *fe = static_cast<QScriptDebuggerCommandFinishedEvent*>(e);
+        q->notifyCommandFinished(fe->id(), fe->response());
+        return true;
+    }
+    return QScriptDebuggerFrontendPrivate::event(e);
+}
+
+QScriptEngineDebuggerFrontend::QScriptEngineDebuggerFrontend()
+    : QScriptDebuggerFrontend(*new QScriptEngineDebuggerFrontendPrivate)
+{
+}
+
+QScriptEngineDebuggerFrontend::~QScriptEngineDebuggerFrontend()
+{
+    detach();
+}
+
+/*!
+  Attaches this front-end to the given \a engine.
+*/
+void QScriptEngineDebuggerFrontend::attachTo(QScriptEngine *engine)
+{
+    Q_D(QScriptEngineDebuggerFrontend);
+    if (d->backend)
+        d->backend->detach();
+    else
+        d->backend = new QScriptEngineDebuggerBackend(d);
+    d->backend->attachTo(engine);
+}
+
+/*!
+  Detaches this front-end from the current script engine.
+*/
+void QScriptEngineDebuggerFrontend::detach()
+{
+    Q_D(QScriptEngineDebuggerFrontend);
+    if (d->backend)
+        d->backend->detach();
+}
+
+QScriptValue QScriptEngineDebuggerFrontend::traceFunction() const
+{
+    Q_D(const QScriptEngineDebuggerFrontend);
+    if (d->backend)
+        d->backend->traceFunction();
+    return QScriptValue();
+}
+
+QScriptDebuggerBackend *QScriptEngineDebuggerFrontend::backend() const
+{
+    Q_D(const QScriptEngineDebuggerFrontend);
+    return d->backend;
+}
+
+/*!
+  \internal
+*/
+void QScriptEngineDebuggerFrontend::processCommand(int id, const QScriptDebuggerCommand &command)
+{
+    Q_D(QScriptEngineDebuggerFrontend);
+    Q_ASSERT(d->backend != 0);
+    d->backend->processCommand(id, command);
+}
+
+QT_END_NAMESPACE