/usr/include/casacore/python/Converters/PycBasicData.h is in casacore-dev 2.2.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//# Copyright (C) 2006
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//# $Id: PycBasicData.h,v 1.5 2006/10/25 01:42:13 gvandiep Exp $
#ifndef PYRAP_PYCBASICDATA_H
#define PYRAP_PYCBASICDATA_H
// include python first to avoid _POSIX_C_SOURCE redefined warnings
#include <boost/python.hpp>
#include <boost/python/object.hpp>
#include <casacore/python/Converters/PycArray.h>
#include <casacore/casa/BasicSL/String.h>
#include <casacore/casa/Arrays/IPosition.h>
#include <casacore/casa/Arrays/Vector.h>
#include <casacore/casa/Utilities/Assert.h>
#include <casacore/casa/Exceptions/Error.h>
#include <vector>
#include <map>
#if PY_MAJOR_VERSION >= 3
#define IS_PY3K
#endif
// Define classes and functions to convert the basic data types and
// containers to and from Python.
namespace casacore { namespace python {
// Prevent a converter from being registered multiple times.
class pyregistry
{
public:
static bool get (const std::string& name);
static void set (const std::string& name);
private:
static std::map<std::string,bool> _registry;
};
// Check if the given object is a sequence object.
// If so, return true.
// py_obj gets changed if the given object was a scalar numpy/numarray.
// In that case it is flattened.
bool getSeqObject (boost::python::object& py_obj);
// Convert a String object to python.
struct casa_string_to_python_str
{
static boost::python::object makeobject(String const& s)
{ return boost::python::object((const std::string&)s); }
static PyObject* convert(String const& s)
{ return boost::python::incref(makeobject(s).ptr()); }
};
// Convert a String object from python.
struct casa_string_from_python_str
{
casa_string_from_python_str()
{
boost::python::converter::registry::push_back(
&convertible,
&construct,
boost::python::type_id<String>());
}
static void* convertible(PyObject* obj_ptr)
{
#ifdef IS_PY3K
if (!PyUnicode_Check(obj_ptr)) return 0;
#else
if (!PyString_Check(obj_ptr)) return 0;
#endif
return obj_ptr;
}
static void construct(
PyObject* obj_ptr,
boost::python::converter::rvalue_from_python_stage1_data* data)
{
#ifdef IS_PY3K
PyObject * temp_bytes = PyUnicode_AsEncodedString(obj_ptr, "ASCII", "strict"); // Owned reference
char* value;
if (temp_bytes != NULL) {
value = PyBytes_AS_STRING(temp_bytes); // Borrowed pointer
value = strdup(value);
Py_DECREF(temp_bytes);
} else {
boost::python::throw_error_already_set();
}
#else
const char* value = PyString_AsString(obj_ptr);
#endif
if (value == 0) boost::python::throw_error_already_set();
void* storage = (
(boost::python::converter::rvalue_from_python_storage<String>*)
data)->storage.bytes;
new (storage) String(value);
data->convertible = storage;
}
};
// Default operations on all containers for conversion from Python
// container to C++ one.
// Copied from
// scitbx/include/scitbx/boost_python/container_conversions.h that is
// described in the <a
// href="http://www.boost.org/libs/python/doc/v2/faq.html">
// Boost.Python FAQ. </a>
// @author Ralf W. Grosse-Kunstleve <rwgk@yahoo.com> of
// <a href="http://www.lbl.gov/">Lawrence Berkeley National Laboratory</a>
struct default_policy
{
static bool check_convertibility_per_element() { return true; }
template <typename ContainerType>
static bool check_size(boost::type<ContainerType>, std::size_t)
{
return true;
}
template <typename ContainerType>
static void assert_size(boost::type<ContainerType>, std::size_t)
{}
template <typename ContainerType>
static void reserve(ContainerType&, std::size_t)
{}
};
// Operations on containers that have variable capacity for
// conversion from Python container to C++ one.
// Copied from
// scitbx/include/scitbx/boost_python/container_conversions.h that is
// described in the <a
// href="http://www.boost.org/libs/python/doc/v2/faq.html">
// Boost.Python FAQ. </a>
// @author Ralf W. Grosse-Kunstleve <rwgk@yahoo.com> of
// <a href="http://www.lbl.gov/">Lawrence Berkeley National Laboratory</a>
struct stl_variable_capacity_policy : default_policy
{
template <typename ContainerType>
static void reserve(ContainerType& a, std::size_t sz)
{
a.reserve(sz);
}
template <typename ContainerType, typename ValueType>
static void set_value(ContainerType& a, std::size_t i, ValueType const& v)
{
AlwaysAssert(a.size() == i, AipsError);
a.push_back(v);
}
};
struct casa_variable_capacity_policy : default_policy
{
template <typename ContainerType>
static void reserve(ContainerType& a, std::size_t sz)
{
a.resize(sz);
}
template <typename ContainerType, typename ValueType>
static void set_value(ContainerType& a, std::size_t i, ValueType const& v)
{
assert(a.size() > i);
a[i] = v;
}
};
struct casa_reversed_variable_capacity_policy : default_policy
{
template <typename ContainerType>
static void reserve(ContainerType& a, std::size_t sz)
{
a.resize(sz);
}
template <typename ContainerType, typename ValueType>
static void set_value(ContainerType& a, std::size_t i, ValueType const& v)
{
assert(a.size() > i);
a[a.size() - i - 1] = v;
}
};
// A wrapper of a conversion function to convert a STL vector to a
// Python list. This class satisfies the requirements of the
// boost::python::to_python_converter conversion template argument.
// Copied from
// scitbx/include/scitbx/boost_python/container_conversions.h that is
// described in the <a
// href="http://www.boost.org/libs/python/doc/v2/faq.html">
// Boost.Python FAQ. </a>
// @author Ralf W. Grosse-Kunstleve <rwgk@yahoo.com> of
// <a href="http://www.lbl.gov/">Lawrence Berkeley National Laboratory</a>
template < typename ContainerType >
struct to_list
{
// Creates and returns a Python list from the elements copied
// from a STL container. The ContainerType must be a container
// with STL iterators defined on it.
// It may contain any type of object supported by the
// boost::python::object constructor.
static boost::python::object makeobject (ContainerType const& c)
{
boost::python::list result;
typename ContainerType::const_iterator i = c.begin();
typename ContainerType::const_iterator iEnd = c.end();
for( ; i != iEnd; ++i) {
result.append(*i);
}
return result;
}
static PyObject* convert (ContainerType const& c)
{
return boost::python::incref(makeobject(c).ptr());
}
};
//# Make specialisations for various types.
template <>
struct to_list <casacore::IPosition >
{
typedef IPosition ContainerType;
static boost::python::list makeobject (ContainerType const& c)
{
// Reverse IPosition values.
boost::python::list result;
for (int i=c.size()-1; i>=0; --i) {
result.append(c[i]);
}
return result;
}
static PyObject* convert (ContainerType const& c)
{
return boost::python::incref(makeobject(c).ptr());
}
};
//# This specialisation is needed because on OS-X 10.9 clang-3.5 with
//# Boost-Python 1.57 gives a compile error
//# /opt/casa/01/include/boost/python/converter/arg_to_python.hpp:209:9:
//# error: no matching constructor for initialization of
//# 'boost::python::converter::detail::arg_to_python_base'
//# : arg_to_python_base(&x, registered<T>::converters)
template <>
struct to_list <std::vector <bool> >
{
typedef std::vector <bool> ContainerType;
static boost::python::list makeobject (ContainerType const& c)
{
boost::python::list result;
ContainerType::const_iterator i = c.begin();
ContainerType::const_iterator iEnd = c.end();
for( ; i != iEnd; ++i) {
bool b = *i;
result.append(b);
}
return result;
}
static PyObject* convert (ContainerType const& c)
{
return boost::python::incref(makeobject(c).ptr());
}
};
template <>
struct to_list <std::vector <casacore::String> >
{
typedef std::vector <casacore::String> ContainerType;
static boost::python::list makeobject (ContainerType const& c)
{
boost::python::list result;
ContainerType::const_iterator i = c.begin();
ContainerType::const_iterator iEnd = c.end();
for( ; i != iEnd; ++i) {
result.append((std::string const&)(*i));
}
return result;
}
static PyObject* convert (ContainerType const& c)
{
return boost::python::incref(makeobject(c).ptr());
}
};
template <>
struct to_list <casacore::Array <casacore::String> >
{
typedef casacore::Array <casacore::String> ContainerType;
static boost::python::object makeobject (ContainerType const& c)
{
boost::python::list result;
ContainerType::const_iterator i = c.begin();
ContainerType::const_iterator iEnd = c.end();
for( ; i != iEnd; ++i) {
result.append((std::string const&)(*i));
}
return result;
}
static PyObject* convert (ContainerType const& c)
{
return boost::python::incref(makeobject(c).ptr());
}
};
template <>
struct to_list <casacore::Vector <casacore::String> >
{
typedef casacore::Vector <casacore::String> ContainerType;
static boost::python::object makeobject (ContainerType const& c)
{
boost::python::list result;
ContainerType::const_iterator i = c.begin();
ContainerType::const_iterator iEnd = c.end();
for( ; i != iEnd; ++i) {
result.append((std::string const&)(*i));
}
return result;
}
static PyObject* convert (ContainerType const& c)
{
return boost::python::incref(makeobject(c).ptr());
}
};
// Converts an STL vector or casa Array of T objects to Python list.
// Copied from
// scitbx/include/scitbx/boost_python/container_conversions.h that is
// described in the <a
// href="http://www.boost.org/libs/python/doc/v2/faq.html">
// Boost.Python FAQ. </a>
// @author Ralf W. Grosse-Kunstleve <rwgk@yahoo.com> of
// <a href="http://www.lbl.gov/">Lawrence Berkeley National Laboratory</a>
template < typename T >
struct std_vector_to_list
{
std_vector_to_list ()
{
boost::python::to_python_converter < std::vector < T >,
to_list < std::vector < T > > > ();
}
};
template < typename T >
struct casa_array_to_list
{
casa_array_to_list ()
{
boost::python::to_python_converter < casacore::Array < T >,
to_list < casacore::Array < T > > > ();
}
};
template < typename T >
struct casa_vector_to_list
{
casa_vector_to_list ()
{
boost::python::to_python_converter < casacore::Vector < T >,
to_list < casacore::Vector < T > > > ();
}
};
struct casa_iposition_to_list
{
casa_iposition_to_list ()
{
boost::python::to_python_converter < casacore::IPosition,
to_list < casacore::IPosition > > ();
}
};
// Conversion of Python sequence to C++ container.
// Copied from
// scitbx/include/scitbx/boost_python/container_conversions.h that is
// described in the <a
// href="http://www.boost.org/libs/python/doc/v2/faq.html">
// Boost.Python FAQ. </a>
// @author Ralf W. Grosse-Kunstleve <rwgk@yahoo.com> of
// <a href="http://www.lbl.gov/">Lawrence Berkeley National Laboratory</a>
template <typename ContainerType, typename ConversionPolicy>
struct from_python_sequence
{
typedef typename ContainerType::value_type container_element_type;
from_python_sequence()
{
boost::python::converter::registry::push_back(
&convertible,
&construct,
boost::python::type_id<ContainerType>());
}
// Appears to return @a obj_ptr if it is type of Python sequence
// that can be convertible to C++ container.
static void* convertible(PyObject* obj_ptr)
{
using namespace boost::python;
handle<> py_hdl(obj_ptr);
if (PyErr_Occurred()) {
PyErr_Clear();
return 0;
}
object py_obj(py_hdl);
incref(obj_ptr); // incr refcount, because ~object decrements it
// Accept single values.
if (PyBool_Check(obj_ptr)
#ifdef IS_PY3K
|| PyLong_Check(obj_ptr)
#else
|| PyInt_Check(obj_ptr)
#endif
|| PyLong_Check(obj_ptr)
|| PyFloat_Check(obj_ptr)
|| PyComplex_Check(obj_ptr)
#ifdef IS_PY3K
|| PyUnicode_Check(obj_ptr)) {
#else
|| PyString_Check(obj_ptr)) {
#endif
extract<container_element_type> elem_proxy(py_obj);
if (!elem_proxy.check()) return 0;
return obj_ptr;
}
// An array scalar is accepted.
if (PycArrayScalarCheck(obj_ptr)) {
return obj_ptr;
}
// Get the sequence object.
// It can be a numarray/numpy scalar in which case
// it fills py_obj with a flattened array.
if (! getSeqObject (py_obj)) {
return 0;
}
// Check the sequence.
// It must be convertible to an iterator.
handle<> obj_iter(allow_null(PyObject_GetIter(py_obj.ptr())));
if (!obj_iter.get()) {
PyErr_Clear();
return 0;
}
if (!check_convertibility (py_obj.ptr())) {
return 0;
}
return obj_ptr;
}
// Constructs a C++ container from a Python sequence.
static void construct(
PyObject* obj_ptr,
boost::python::converter::rvalue_from_python_stage1_data* data)
{
using namespace boost::python;
using boost::python::converter::rvalue_from_python_storage;
void* storage = (
(rvalue_from_python_storage<ContainerType>*)
data)->storage.bytes;
new (storage) ContainerType();
data->convertible = storage;
ContainerType& result = *((ContainerType*)storage);
if (PyBool_Check(obj_ptr)
#ifndef IS_PY3K
|| PyInt_Check(obj_ptr)
#endif
|| PyLong_Check(obj_ptr)
|| PyFloat_Check(obj_ptr)
|| PyComplex_Check(obj_ptr)
#ifdef IS_PY3K
|| PyUnicode_Check(obj_ptr)
#else
|| PyString_Check(obj_ptr)
#endif
|| PycArrayScalarCheck(obj_ptr)) {
extract<container_element_type> elem_proxy(obj_ptr);
ConversionPolicy::reserve(result, 1);
ConversionPolicy::set_value(result, 0, elem_proxy());
return;
}
handle<> py_hdl(obj_ptr);
object py_obj = object(py_hdl);
incref(obj_ptr); // incr refcount, because ~object decrements it
assert (getSeqObject (py_obj));
fill_container (result, py_obj.ptr());
// ConversionPolicy::reserve(result, 1);
// ConversionPolicy::set_value(result, 0,
// extract<container_element_type>(py_flat.attr("__getitem__")(0)));
}
// Constructs a C++ container from a Python sequence.
static ContainerType make_container(PyObject* obj_ptr)
{
ContainerType result;
fill_container (result, obj_ptr);
return result;
}
private:
static void fill_container (ContainerType& result, PyObject* obj_ptr)
{
using namespace boost::python;
int obj_size = PyObject_Length(obj_ptr);
handle<> obj_iter(PyObject_GetIter(obj_ptr));
ConversionPolicy::reserve(result, obj_size);
std::size_t i=0;
for(;;i++) {
handle<> py_elem_hdl(allow_null(PyIter_Next(obj_iter.get())));
if (PyErr_Occurred()) throw_error_already_set();
if (!py_elem_hdl.get()) break; // end of iteration
object py_elem_obj(py_elem_hdl);
extract<container_element_type> elem_proxy(py_elem_obj);
ConversionPolicy::set_value(result, i, elem_proxy());
}
ConversionPolicy::assert_size(boost::type<ContainerType>(), i);
}
static bool check_convertibility(PyObject* obj_ptr)
{
using namespace boost::python;
handle<> obj_iter(allow_null(PyObject_GetIter(obj_ptr)));
if (!obj_iter.get()) { // must be convertible to an iterator
PyErr_Clear();
return false;
}
int obj_size = PyObject_Length(obj_ptr);
if (obj_size < 0) { // must be a measurable sequence
PyErr_Clear();
return false;
}
if (ConversionPolicy::check_convertibility_per_element()) {
if (!ConversionPolicy::check_size(
boost::type<ContainerType>(), obj_size)) return false;
// All elements in a range and array have the same type, so
// need to check the first element only.
bool is_same = PyRange_Check(obj_ptr) ||
(PySequence_Check(obj_ptr)
&& !PyTuple_Check(obj_ptr) && !PyList_Check(obj_ptr));
int i = 0;
for (;;i++) {
handle<> py_elem_hdl(allow_null(PyIter_Next(obj_iter.get())));
if (PyErr_Occurred()) {
PyErr_Clear();
return false;
}
if (!py_elem_hdl.get()) break; // end of iteration
object py_elem_obj(py_elem_hdl);
extract<container_element_type> elem_proxy(py_elem_obj);
if (!elem_proxy.check()) return false;
if (is_same) break; // all elements are of the same type
}
if (!is_same) assert(i == obj_size );
}
return true;
}
};
// Register the String conversion.
struct convert_casa_string
{
static void reg();
};
inline void register_convert_casa_string()
{ convert_casa_string::reg(); }
// Register the IPosition conversion.
struct convert_casa_iposition
{
static void reg();
};
inline void register_convert_casa_iposition()
{ convert_casa_iposition::reg(); }
// Register the std::vector conversions.
template < typename T >
struct convert_std_vector
{
static void reg()
{
std::string tname(typeid(std::vector<T>).name());
if (! pyregistry::get (tname)) {
pyregistry::set (tname);
std_vector_to_list < T > ();
from_python_sequence < std::vector < T >,
stl_variable_capacity_policy > ();
}
}
};
template < typename T >
inline void register_convert_std_vector()
{ convert_std_vector<T>::reg(); }
// Register the casacore::Vector conversions.
template < typename T >
struct convert_casa_vector
{
static void reg()
{
std::string tname(typeid(casacore::Vector<T>).name());
if (! pyregistry::get (tname)) {
pyregistry::set (tname);
casa_array_to_list < T > ();
casa_vector_to_list < T > ();
from_python_sequence < casacore::Vector < T >,
casa_variable_capacity_policy > ();
}
}
};
template < typename T >
inline void register_convert_casa_vector()
{ convert_casa_vector<T>::reg(); }
// Register all standard basic conversions.
// These are String, IPosition, Vector<String>, Vector<Int>,
// Vector<Double>, Vector<DComplex>.
void register_convert_basicdata();
}}
#endif
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