python/src/converter/registry.cpp at python · boostorg/python · GitHub

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// Copyright David Abrahams 2001.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#include <boost/python/converter/registry.hpp>

#include <boost/python/converter/registrations.hpp>

#include <boost/python/converter/builtin_converters.hpp>

#include <set>

#include <stdexcept>

#if defined(__APPLE__) && defined(__MACH__) && defined(__GNUC__) \

&& __GNUC__ == 3 && __GNUC_MINOR__ <= 4 && !defined(__APPLE_CC__)

# define BOOST_PYTHON_CONVERTER_REGISTRY_APPLE_MACH_WORKAROUND

#endif

#if defined(BOOST_PYTHON_TRACE_REGISTRY) \

|| defined(BOOST_PYTHON_CONVERTER_REGISTRY_APPLE_MACH_WORKAROUND)

# include <iostream>

#endif

namespace boost { namespace python { namespace converter {

BOOST_PYTHON_DECL PyTypeObject const* registration::expected_from_python_type() const

{

if (this->m_class_object != 0)

return this->m_class_object;

std::set<PyTypeObject const*> pool;

for(rvalue_from_python_chain* r = rvalue_chain; r ; r=r->next)

if(r->expected_pytype)

pool.insert(r->expected_pytype());

//for now I skip the search for common base

if (pool.size()==1)

return *pool.begin();

return 0;

}

BOOST_PYTHON_DECL PyTypeObject const* registration::to_python_target_type() const

{

if (this->m_class_object != 0)

return this->m_class_object;

if (this->m_to_python_target_type != 0)

return this->m_to_python_target_type();

return 0;

}

BOOST_PYTHON_DECL PyTypeObject* registration::get_class_object() const

{

if (this->m_class_object == 0)

{

::PyErr_Format(

PyExc_TypeError

, const_cast<char*>("No Python class registered for C++ class %s")

, this->target_type.name());

throw_error_already_set();

}

return this->m_class_object;

}

BOOST_PYTHON_DECL PyObject* registration::to_python(void const volatile* source) const

{

if (this->m_to_python == 0)

{

handle<> msg(

#if PY_VERSION_HEX >= 0x3000000

::PyUnicode_FromFormat

#else

::PyString_FromFormat

#endif

(

"No to_python (by-value) converter found for C++ type: %s"

, this->target_type.name()

)

);

PyErr_SetObject(PyExc_TypeError, msg.get());

throw_error_already_set();

}

return source == 0

? incref(Py_None)

: this->m_to_python(const_cast<void*>(source));

}

namespace

{

template< typename T >

void delete_node( T* node )

{

if( !!node && !!node->next )

delete_node( node->next );

delete node;

}

registration::~registration()

{

delete_node(lvalue_chain);

delete_node(rvalue_chain);

}

namespace // <unnamed>

{

typedef registration entry;

typedef std::set<entry> registry_t;

#ifndef BOOST_PYTHON_CONVERTER_REGISTRY_APPLE_MACH_WORKAROUND

registry_t& entries()

{

static registry_t registry;

# ifndef BOOST_PYTHON_SUPPRESS_REGISTRY_INITIALIZATION

static bool builtin_converters_initialized = false;

if (!builtin_converters_initialized)

{

// Make this true early because registering the builtin

// converters will cause recursion.

builtin_converters_initialized = true;

initialize_builtin_converters();

}

# ifdef BOOST_PYTHON_TRACE_REGISTRY

std::cout << "registry: ";

for (registry_t::iterator p = registry.begin(); p != registry.end(); ++p)

{

std::cout << p->target_type << "; ";

}

std::cout << '\n';

# endif

return registry;

}

#else

registry_t& static_registry()

{

static registry_t result;

return result;

}

bool static_builtin_converters_initialized()

{

static bool result = false;

if (result == false) {

result = true;

std::cout << std::flush;

return false;

}

return true;

}

registry_t& entries()

{

# ifndef BOOST_PYTHON_SUPPRESS_REGISTRY_INITIALIZATION

if (!static_builtin_converters_initialized())

{

initialize_builtin_converters();

}

# ifdef BOOST_PYTHON_TRACE_REGISTRY

std::cout << "registry: ";

for (registry_t::iterator p = static_registry().begin(); p != static_registry().end(); ++p)

{

std::cout << p->target_type << "; ";

}

std::cout << '\n';

# endif

return static_registry();

}

#endif // BOOST_PYTHON_CONVERTER_REGISTRY_APPLE_MACH_WORKAROUND

entry* get(type_info type, bool is_shared_ptr = false)

{

# ifdef BOOST_PYTHON_TRACE_REGISTRY

registry_t::iterator p = entries().find(entry(type));

std::cout << "looking up " << type << ": "

<< (p == entries().end() || p->target_type != type

? "...NOT found\n" : "...found\n");

# endif

std::pair<registry_t::const_iterator,bool> pos_ins

= entries().insert(entry(type,is_shared_ptr));

# if __MWERKS__ >= 0x3000

// do a little invariant checking if a change was made

if ( pos_ins.second )

assert(entries().invariants());

# endif

return const_cast<entry*>(&*pos_ins.first);

}

} // namespace <unnamed>

namespace registry

{

void insert(to_python_function_t f, type_info source_t, PyTypeObject const* (*to_python_target_type)())

{

# ifdef BOOST_PYTHON_TRACE_REGISTRY

std::cout << "inserting to_python " << source_t << "\n";

# endif

entry* slot = get(source_t);

assert(slot->m_to_python == 0); // we have a problem otherwise

if (slot->m_to_python != 0)

{

std::string msg = (

std::string("to-Python converter for ")

+ source_t.name()

+ " already registered; second conversion method ignored."

);

if ( ::PyErr_Warn( NULL, const_cast<char*>(msg.c_str()) ) )

{

throw_error_already_set();

}

slot->m_to_python = f;

slot->m_to_python_target_type = to_python_target_type;

}

// Insert an lvalue from_python converter

void insert(convertible_function convert, type_info key, PyTypeObject const* (*exp_pytype)())

{

# ifdef BOOST_PYTHON_TRACE_REGISTRY

std::cout << "inserting lvalue from_python " << key << "\n";

# endif

entry* found = get(key);

lvalue_from_python_chain *registration = new lvalue_from_python_chain;

registration->convert = convert;

registration->next = found->lvalue_chain;

found->lvalue_chain = registration;

insert(convert, 0, key,exp_pytype);

}

// Insert an rvalue from_python converter

void insert(convertible_function convertible

, constructor_function construct

, type_info key

, PyTypeObject const* (*exp_pytype)())

{

# ifdef BOOST_PYTHON_TRACE_REGISTRY

std::cout << "inserting rvalue from_python " << key << "\n";

# endif

entry* found = get(key);

rvalue_from_python_chain *registration = new rvalue_from_python_chain;

registration->convertible = convertible;

registration->construct = construct;

registration->expected_pytype = exp_pytype;

registration->next = found->rvalue_chain;

found->rvalue_chain = registration;

}

// Insert an rvalue from_python converter

void push_back(convertible_function convertible

, constructor_function construct

, type_info key

, PyTypeObject const* (*exp_pytype)())

{

# ifdef BOOST_PYTHON_TRACE_REGISTRY

std::cout << "push_back rvalue from_python " << key << "\n";

# endif

rvalue_from_python_chain** found = &get(key)->rvalue_chain;

while (*found != 0)

found = &(*found)->next;

rvalue_from_python_chain *registration = new rvalue_from_python_chain;

registration->convertible = convertible;

registration->construct = construct;

registration->expected_pytype = exp_pytype;

registration->next = 0;

*found = registration;

}

registration const& lookup(type_info key)

{

return *get(key);

}

registration const& lookup_shared_ptr(type_info key)

{

return *get(key, true);

}

registration const* query(type_info type)

{

registry_t::iterator p = entries().find(entry(type));

# ifdef BOOST_PYTHON_TRACE_REGISTRY

std::cout << "querying " << type

<< (p == entries().end() || p->target_type != type

? "...NOT found\n" : "...found\n");

# endif

return (p == entries().end() || p->target_type != type) ? 0 : &*p;

}

} // namespace registry

}}} // namespace boost::python::converter

python/src/converter/registry.cpp at python · boostorg/python · GitHub

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