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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#ifndef Py_PYTHON_H
+#include <Python.h>
+#endif // #ifdef Py_PYTHON_H
+
+#include <com/sun/star/uno/Any.hxx>
+
+namespace com::sun::star::uno { class XComponentContext; }
+namespace com::sun::star::uno { template <typename > class Reference; }
+
+/**
+   External interface of the Python UNO bridge.
+
+   This is a C++ interface, because the core UNO components
+   invocation and proxyfactory are used to implement the bridge.
+
+   This interface is somewhat private and my change in future.
+
+   A scripting framework implementation may use this interface
+   to do the necessary conversions.
+*/
+
+#if defined LO_DLLIMPLEMENTATION_PYUNO
+#define LO_DLLPUBLIC_PYUNO SAL_DLLPUBLIC_EXPORT
+#else
+#define LO_DLLPUBLIC_PYUNO SAL_DLLPUBLIC_IMPORT
+#endif
+
+/** function called by the python runtime to initialize the
+    pyuno module.
+
+    preconditions: python has been initialized before and
+                   the global interpreter lock is held
+*/
+
+extern "C" LO_DLLPUBLIC_PYUNO PyObject* PyInit_pyuno();
+
+namespace pyuno
+{
+
+enum NotNull
+{
+    /** definition of a no acquire enum for ctors
+     */
+    NOT_NULL
+};
+
+/** Helper class for keeping references to python objects.
+    BEWARE: Look up every python function you use to check
+    whether you get an acquired or not acquired object pointer
+    (python terminus for a not acquired object pointer
+    is 'borrowed reference'). Use in the acquired pointer cases the
+    PyRef( pointer, SAL_NO_ACQUIRE) ctor.
+
+    precondition: python has been initialized before and
+    the global interpreter lock is held
+
+*/
+class PyRef
+{
+    PyObject *m;
+public:
+    PyRef () : m(nullptr) {}
+    PyRef( PyObject * p ) : m( p ) { Py_XINCREF( m ); }
+
+    PyRef( PyObject * p, __sal_NoAcquire ) : m( p ) {}
+
+    PyRef( PyObject * p, __sal_NoAcquire, NotNull ) : m( p )
+    {
+        if (!m)
+            throw std::bad_alloc();
+    }
+
+    PyRef(const PyRef &r) : m(r.get()) { Py_XINCREF(m); }
+    PyRef(PyRef &&r) noexcept : m(r.get()) { r.scratch(); }
+
+    ~PyRef() { Py_XDECREF( m ); }
+
+    PyObject *get() const noexcept { return m; }
+
+    PyObject * getAcquired() const
+    {
+        Py_XINCREF( m );
+        return m;
+    }
+
+    PyRef& operator=(const PyRef& r)
+    {
+        PyObject *tmp = m;
+        m = r.getAcquired();
+        Py_XDECREF(tmp);
+        return *this;
+    }
+
+    PyRef& operator=(PyRef&& r)
+    {
+        PyObject *tmp = m;
+        m = r.get();
+        r.scratch();
+        Py_XDECREF(tmp);
+        return *this;
+    }
+
+    bool operator == (  const PyRef & r ) const
+    {
+        return r.get() == m;
+    }
+
+    /** clears the reference without decreasing the reference count
+        only seldom needed ! */
+    void scratch() noexcept
+    {
+        m = nullptr;
+    }
+
+    /** returns 1 when the reference points to a python object python object,
+        otherwise 0.
+    */
+    bool is() const
+    {
+        return m != nullptr;
+    }
+
+    struct Hash
+    {
+        sal_IntPtr operator () ( const PyRef &r) const { return reinterpret_cast<sal_IntPtr>( r.get() ); }
+    };
+};
+
+//struct stRuntimeImpl;
+typedef struct stRuntimeImpl RuntimeImpl;
+
+enum ConversionMode { ACCEPT_UNO_ANY, REJECT_UNO_ANY };
+
+
+/** The pyuno::Runtime class keeps the internal state of the python UNO bridge
+    for the currently in use python interpreter.
+
+    You may keep a Runtime instance, use it from a different thread, etc. But you must
+    make sure to fulfill all preconditions mentioned for the specific methods.
+*/
+
+class LO_DLLPUBLIC_PYUNO Runtime
+{
+    RuntimeImpl *impl;
+
+    /**
+        Safely unpacks a Python iterator into a sequence, then
+        stores it in an Any. Used internally by pyObject2Any
+    */
+    bool pyIterUnpack( PyObject *const, css::uno::Any & ) const;
+public:
+    ~Runtime( );
+
+    /**
+        preconditions: python has been initialized before,
+        the global interpreter lock is held and pyuno
+        has been initialized for the currently used interpreter.
+
+        Note: This method exists for efficiency reasons to save
+        lookup costs for any2PyObject and pyObject2Any
+
+        @throw RuntimeException in case the runtime has not been
+               initialized before
+     */
+    Runtime();
+
+    Runtime( const Runtime & );
+    Runtime & operator = ( const Runtime & );
+
+    /** Initializes the python-UNO bridge. May be called only once per python interpreter.
+
+        @param ctx the component context is used to instantiate bridge services needed
+        for bridging such as invocation, typeconverter, invocationadapterfactory, etc.
+
+        preconditions: python has been initialized before and
+        the global interpreter lock is held and pyuno is not
+        initialized (see isInitialized() ).
+
+        @throw RuntimeException in case the thread is not attached or the runtime
+                                has not been initialized.
+    */
+    static void initialize(
+        const css::uno::Reference< css::uno::XComponentContext > & ctx );
+
+    /** Checks, whether the uno runtime is already initialized in the current python interpreter.
+
+        @throws css::uno::RuntimeException
+     */
+    static bool isInitialized();
+
+    /** converts something contained in a UNO Any to a Python object
+
+        preconditions: python has been initialized before,
+        the global interpreter lock is held and pyuno::Runtime
+        has been initialized.
+
+        @throws css::script::CannotConvertException
+        @throws css::lang::IllegalArgumentException
+        @throws css::uno::RuntimeException
+    */
+    PyRef any2PyObject (const css::uno::Any &source ) const;
+
+    /** converts a Python object to a UNO any
+
+        preconditions: python has been initialized before,
+        the global interpreter lock is held and pyuno
+        has been initialized
+
+        @throws css::uno::RuntimeException
+    */
+    css::uno::Any pyObject2Any (
+        const PyRef & source , enum ConversionMode mode = REJECT_UNO_ANY ) const;
+
+    /** extracts a proper uno exception from a given python exception
+     */
+    css::uno::Any extractUnoException(
+        const PyRef & excType, const PyRef & excValue, const PyRef & excTraceback) const;
+
+    /** Returns the internal handle. Should only be used by the module implementation
+     */
+    RuntimeImpl *getImpl() const { return impl; }
+};
+
+
+/** helper class for attaching the current thread to the python runtime.
+
+    Attaching is done creating a new threadstate for the given interpreter
+    and acquiring the global interpreter lock.
+
+    Usage:
+
+    ... don't use python here
+    {
+        PyThreadAttach guard( PyInterpreterState_Head() );
+        {
+            ... do whatever python code you want
+            {
+               PyThreadDetach antiguard;
+               ... don't use python here
+            }
+            ... do whatever python code you want
+        }
+    }
+    ... don't use python here
+
+    Note: The additional scope brackets after the PyThreadAttach are needed,
+          e.g. when you would leave them away, dtors of potential pyrefs
+          may be called after the thread has detached again.
+ */
+class LO_DLLPUBLIC_PYUNO PyThreadAttach
+{
+    PyThreadState *tstate;
+    bool m_isNewState;
+    PyThreadAttach ( const PyThreadAttach & ) = delete;
+    PyThreadAttach & operator = ( const PyThreadAttach & ) = delete;
+public:
+
+    /** Creates a new python threadstate and acquires the global interpreter lock.
+        precondition: The current thread MUST NOT hold the global interpreter lock.
+        postcondition: The global interpreter lock is acquired
+
+        @throws css::uno::RuntimeException
+             in case no pythread state could be created
+     */
+    PyThreadAttach( PyInterpreterState *interp);
+
+
+    /** Releases the global interpreter lock and destroys the thread state.
+     */
+    ~PyThreadAttach();
+};
+
+/** helper class for detaching the current thread from the python runtime
+    to do some blocking, non-python related operation.
+
+    @see PyThreadAttach
+*/
+class PyThreadDetach
+{
+    PyThreadState *tstate;
+    PyThreadDetach ( const PyThreadDetach & ) = delete;
+    PyThreadDetach & operator = ( const PyThreadDetach & ) = delete;
+
+public:
+    /** Releases the global interpreter lock.
+
+       precondition: The current thread MUST hold the global interpreter lock.
+       postcondition: The current thread does not hold the global interpreter lock anymore.
+
+       @throws css::uno::RuntimeException
+    */
+    PyThreadDetach();
+    /** Acquires the global interpreter lock again
+    */
+    ~PyThreadDetach();
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */