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choelzl
2022-04-07 18:46:57 +02:00
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cs440-acg/ext/openexr/PyIlmBase/PyIex/PyIex.h Normal file
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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2001-2011, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_PY_IEX_H
#define INCLUDED_PY_IEX_H
//-----------------------------------------------------------------------------
//
// PyIex -- support for mapping C++ exceptions to Python exceptions
//
//-----------------------------------------------------------------------------
#include <sstream>
#include <Python.h>
#include <boost/python.hpp>
#include <IexMathFloatExc.h>
#include <boost/python/errors.hpp>
#include <boost/format.hpp>
#include <PyIexTypeTranslator.h>
#include <PyIexExport.h>
namespace PyIex {
//
// Macros to catch C++ exceptions and translate them into Python exceptions
// for use in python C api code:
//
// PY_TRY
// PY_CATCH
//
// Usage:
//
// Insert PY_TRY and PY_CATCH at the beginning and end of every
// wrapper function to make sure that all possible exceptions
// are caught and translated to corresponding Python exceptions.
// Example:
//
// PyObject *
// setSpeed (PyCar *self, PyObject *args)
// {
// PY_TRY
//
// float length;
// PY_ARG_PARSE ((args, "f", &length));
//
// self->data->setSpeed (length); // may throw
//
// PY_RETURN_NONE;
// PY_CATCH
// }
//
#define PY_TRY \
try \
{ \
IEX_NAMESPACE::MathExcOn mathexcon (IEX_NAMESPACE::IEEE_OVERFLOW | \
IEX_NAMESPACE::IEEE_DIVZERO | \
IEX_NAMESPACE::IEEE_INVALID);
#define PY_CATCH \
} \
catch (boost::python::error_already_set) \
{ \
return 0; \
} \
catch (...) \
{ \
boost::python::handle_exception(); \
return 0; \
}
#define PY_CATCH_WITH_COMMENT(text) \
} \
catch (boost::python::error_already_set) \
{ \
/* Can't use text here without messing with */ \
/* the existing python exception state, so */ \
/* ignore */ \
return 0; \
} \
catch (...) \
{ \
boost::python::handle_exception(); \
return 0; \
}
// In most case, PY_CATCH should be used. But in a few cases, the Python
// interpreter treats a return code of 0 as success rather than failure
// (e.g., the tp_print routine in a PyTypeObject struct).
#define PY_CATCH_RETURN_CODE(CODE) \
} \
catch (...) \
{ \
boost::python::handle_exception(); \
return (CODE); \
}
PYIEX_EXPORT TypeTranslator<IEX_NAMESPACE::BaseExc> &baseExcTranslator();
// this should only be called from iexmodule.cpp during iex
// module initialization.
PYIEX_EXPORT void setBaseExcTranslator(TypeTranslator<IEX_NAMESPACE::BaseExc> *t);
//
// Since there's currently no mechanism in boost to inherit off of
// a python type (RuntimeError in this case), we instead use a
// parallel exception hierarchy defined in python, and create
// and register custom converters with boost::python to go between
// the c++ and corresponding python types.
//
// To register exceptions derived from IEX_NAMESPACE::BaseExc, call
// registerException with the type and base type as template
// parameters, and the name and module as arguments. e.g.:
//
// registerException<EpermExc,ErrnoExc>("EpermExc","iex");
//
//
// ExcTranslator provides the methods needed for boost to convert
// the parallel exception types between c++ and python.
//
template <class T>
class ExcTranslator
{
public:
// to python
static PyObject *convert(const T &exc)
{
using namespace boost::python;
object excType = object(handle<>(borrowed(baseExcTranslator().typeObject(&exc))));
return incref(excType(exc.what()).ptr());
}
// from python
static void *convertible(PyObject *exc)
{
#ifdef Py_TYPE
if (!PyType_IsSubtype(Py_TYPE(exc),(PyTypeObject *)baseExcTranslator().baseTypeObject())) return 0;
#else
// prior to python 2.6, access an object's type via it's ob_type member
if (!PyType_IsSubtype(exc->ob_type,(PyTypeObject *)baseExcTranslator().baseTypeObject())) return 0;
#endif
return exc;
}
static void construct(PyObject* raw_exc, boost::python::converter::rvalue_from_python_stage1_data* data)
{
using namespace boost::python;
object exc(handle<>(borrowed(raw_exc)));
std::string s = extract<std::string>(exc.attr("__str__")());
void *storage = ((converter::rvalue_from_python_storage<T>*)data)->storage.bytes;
new (storage) T(s);
data->convertible = storage;
}
};
//
// This function creates the proxy python type for a given exception.
//
static inline boost::python::object
createExceptionProxy(const std::string &name, const std::string &module,
const std::string &baseName, const std::string &baseModule,
PyObject *baseType)
{
using namespace boost::python;
dict tmpDict;
tmpDict["__builtins__"] = handle<>(borrowed(PyEval_GetBuiltins()));
std::string base = baseName;
std::string definition;
if (baseModule != module)
{
definition += (boost::format("import %s\n") % baseModule).str();
base = (boost::format("%s.%s") % baseModule % baseName).str();
}
else
{
tmpDict[base] = object(handle<>(borrowed(baseType)));
}
definition += (boost::format("class %s (%s):\n"
" def __init__ (self, v=''):\n"
" super(%s,self).__init__(v)\n"
" def __repr__ (self):\n"
" return \"%s.%s('%%s')\"%%(self.args[0])\n")
% name % base % name % module % name).str();
handle<> tmp(PyRun_String(definition.c_str(),Py_file_input,tmpDict.ptr(),tmpDict.ptr()));
return tmpDict[name];
}
//
// register an excpetion derived from IEX_NAMESPACE::BaseExc out to python using
// the proxy mechanism described above.
//
template<class Exc, class ExcBase>
void
registerExc(const std::string &name, const std::string &module)
{
using namespace boost::python;
const TypeTranslator<IEX_NAMESPACE::BaseExc>::ClassDesc *baseDesc = baseExcTranslator().template findClassDesc<ExcBase>(baseExcTranslator().firstClassDesc());
std::string baseName = baseDesc->typeName();
std::string baseModule = baseDesc->moduleName();
object exc_class = createExceptionProxy(name, module, baseName, baseModule, baseDesc->typeObject());
scope().attr(name.c_str()) = exc_class;
baseExcTranslator().registerClass<Exc,ExcBase>(name, module, exc_class.ptr());
// to python
to_python_converter<Exc,ExcTranslator<Exc> >();
// from python
converter::registry::push_back(&ExcTranslator<Exc>::convertible,
&ExcTranslator<Exc>::construct,type_id<Exc>());
}
} // namespace PyIex
#endif