create/src/CXX/Python3/Exception.hxx

//-----------------------------------------------------------------------------
//
// Copyright (c) 1998 - 2007, The Regents of the University of California
// Produced at the Lawrence Livermore National Laboratory
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// of the PyCXX distribution.
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//-----------------------------------------------------------------------------

#ifndef __CXX_Exception_h
#define __CXX_Exception_h

#include "CXX/WrapPython.h"
#include "CXX/Version.hxx"
#include "CXX/Python3/Config.hxx"
#include "CXX/Python3/CxxDebug.hxx"
#include "CXX/Python3/IndirectPythonInterface.hxx"

#include <string>
#include <iostream>

// This mimics the Python structure, in order to minimize confusion
namespace Py
{
    class ExtensionExceptionType;

    class Object;

    class PYCXX_EXPORT BaseException
    {
    public:
        BaseException( ExtensionExceptionType &exception, const std::string &reason );
        BaseException( ExtensionExceptionType &exception, Object &reason );
        BaseException( PyObject *exception, Object &reason );
        BaseException( PyObject *exception, const std::string &reason );
        explicit BaseException();

        void clear(); // clear the error

        // is the exception this specific exception 'exc'
        bool matches( ExtensionExceptionType &exc );

        Object errorType(); // get the error type of the active exception
        Object errorValue();// get the error value of the active exception
    };

    // for user defined exceptions to be made know to pycxx
    typedef void (*throw_exception_func_t)( void );
    void addPythonException( ExtensionExceptionType &py_exc_type, throw_exception_func_t throw_func );

#if defined( PYCXX_6_2_COMPATIBILITY )
    class PYCXX_EXPORT Exception : public BaseException
    {
    public:
        Exception( ExtensionExceptionType &exception, const std::string &reason )
        : BaseException( exception, reason )
        {}

        Exception( ExtensionExceptionType &exception, Object &reason )
        : BaseException( exception, reason )
        {}

        Exception( PyObject *exception, Object &reason  )
        : BaseException( exception, reason  )
        {}

        Exception( PyObject *exception, const std::string &reason )
        : BaseException( exception, reason )
        {}

        explicit Exception()
        : BaseException()
        {}
    };
#endif

#define PYCXX_STANDARD_EXCEPTION( eclass, bclass ) \
    class PYCXX_EXPORT eclass : public bclass \
    { \
    public: \
        eclass() {} \
        eclass( const char *reason ) { PyErr_SetString( _Exc_##eclass(), reason ); } \
        eclass( const std::string &reason ) { PyErr_SetString( _Exc_##eclass(), reason.c_str() ); } \
        ~eclass() {} \
        \
        static void throwFunc() { throw eclass(); } \
        static PyObject *exceptionType() { return _Exc_##eclass(); } \
    }; \

#include <CXX/Python3/cxx_standard_exceptions.hxx>

#undef PYCXX_STANDARD_EXCEPTION

#define PYCXX_USER_EXCEPTION_STR_ARG( uclass ) \
class PYCXX_EXPORT uclass : public Py::BaseException \
{ \
public: \
    uclass( const std::string &reason ) \
    : Py::BaseException( m_error, reason ) \
    { } \
    ~uclass() {} \
    static void init( Py::ExtensionModuleBase &module ) \
    { \
        m_error.init( module, #uclass ); \
        Py::addPythonException( m_error, throwFunc ); \
        Py::Dict d( module.moduleDictionary() ); \
        d[#uclass] = m_error; \
    } \
private: \
    uclass() : Py::BaseException() {} \
    static void throwFunc() \
    { \
        throw uclass(); \
    } \
    static Py::ExtensionExceptionType m_error; \
}; \
Py::ExtensionExceptionType uclass::m_error;

#define PYCXX_USER_EXCEPTION_NO_ARG( uclass ) \
class PYCXX_EXPORT uclass : public Py::BaseException \
{ \
public: \
    uclass() \
    : Py::BaseException() \
    { } \
    ~uclass() {} \
    static void init( Py::ExtensionModuleBase &module ) \
    { \
        m_error.init( module, #uclass ); \
        Py::addPythonException( m_error, throwFunc ); \
        Py::Dict d( module.moduleDictionary() ); \
        d[#uclass] = m_error; \
    } \
private: \
    static void throwFunc() \
    { \
        throw uclass(); \
    } \
    static Py::ExtensionExceptionType m_error; \
}; \
Py::ExtensionExceptionType uclass::m_error;

}// Py

#endif