Source.Python/src/core/modules/core/core_cache.cpp at master · srpg/Source.Python · GitHub

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/**

* =============================================================================

* Source Python

* =============================================================================

* This program is free software; you can redistribute it and/or modify it under

* the terms of the GNU General Public License, version 3.0, as published by the

* Free Software Foundation.

* This program 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 General Public License for more

* details.

* You should have received a copy of the GNU General Public License along with

* this program. If not, see <http://www.gnu.org/licenses/>.

* As a special exception, the Source Python Team gives you permission

* to link the code of this program (as well as its derivative works) to

* "Half-Life 2," the "Source Engine," and any Game MODs that run on software

* by the Valve Corporation. You must obey the GNU General Public License in

* all respects for all other code used. Additionally, the Source.Python

* Development Team grants this exception to all derivative works.

//-----------------------------------------------------------------------------

// Includes.

//-----------------------------------------------------------------------------

#include "core_cache.h"

#include "export_main.h"

//-----------------------------------------------------------------------------

// CCachedProperty class.

//-----------------------------------------------------------------------------

CCachedProperty::CCachedProperty(

object fget=object(), object fset=object(), object fdel=object(), object doc=object(),

boost::python::tuple args=boost::python::tuple(), object kwargs=object())

{

set_getter(fget);

set_setter(fset);

set_deleter(fdel);

m_doc = doc;

m_args = args;

if (!kwargs.is_none())

m_kwargs = extract<dict>(kwargs);

else

m_kwargs = dict();

}

object CCachedProperty::_callable_check(object function, const char *szName)

{

if (!function.is_none() && !PyCallable_Check(function.ptr()))

BOOST_RAISE_EXCEPTION(

PyExc_TypeError,

"The given %s function is not callable.", szName

);

return function;

}

object CCachedProperty::get_getter()

{

return m_fget;

}

object CCachedProperty::set_getter(object fget)

{

m_fget = _callable_check(fget, "getter");

return fget;

}

object CCachedProperty::get_setter()

{

return m_fset;

}

object CCachedProperty::set_setter(object fset)

{

m_fset = _callable_check(fset, "setter");

return fset;

}

object CCachedProperty::get_deleter()

{

return m_fdel;

}

object CCachedProperty::set_deleter(object fdel)

{

m_fdel = _callable_check(fdel, "deleter");

return fdel;

}

str CCachedProperty::get_name()

{

return m_name;

}

object CCachedProperty::get_owner()

{

return m_owner;

}

object CCachedProperty::get_cached_value(object instance)

{

if (!m_name || m_owner.is_none())

BOOST_RAISE_EXCEPTION(

PyExc_AttributeError,

"Unable to retrieve the value of an unbound property."

);

PyObject *pValue = NULL;

PyObject **ppDict = _PyObject_GetDictPtr(instance.ptr());

if (ppDict && *ppDict) {

pValue = PyDict_GetItem(*ppDict, m_name.ptr());

}

if (!pValue) {

const char *szName = extract<const char *>(m_name);

BOOST_RAISE_EXCEPTION(

PyExc_KeyError,

"No cached value found for '%s'.",

szName

)

}

return object(handle<>(borrowed(pValue)));

}

void CCachedProperty::set_cached_value(object instance, object value)

{

if (!m_name || m_owner.is_none())

BOOST_RAISE_EXCEPTION(

PyExc_AttributeError,

"Unable to assign the value of an unbound property."

);

if (!PyObject_IsInstance(instance.ptr(), m_owner.ptr())) {

const char *szOwner = extract<const char *>(m_owner.attr("__qualname__"));

BOOST_RAISE_EXCEPTION(

PyExc_TypeError,

"Given instance is not of type '%s'.",

szOwner

)

}

if (PyGen_Check(value.ptr())) {

return;

}

PyObject *pDict = PyObject_GenericGetDict(instance.ptr(), NULL);

if (!pDict) {

const char *szOwner = extract<const char *>(m_owner.attr("__qualname__"));

BOOST_RAISE_EXCEPTION(

PyExc_AttributeError,

"'%s' object has no attribute '__dict__'",

szOwner

)

}

PyDict_SetItem(pDict, m_name.ptr(), value.ptr());

Py_XDECREF(pDict);

}

void CCachedProperty::delete_cached_value(object instance)

{

PyObject **ppDict = _PyObject_GetDictPtr(instance.ptr());

if (!ppDict && !*ppDict) {

return;

}

PyDict_DelItem(*ppDict, m_name.ptr());

if (PyErr_Occurred()) {

if (!PyErr_ExceptionMatches(PyExc_KeyError)) {

throw_error_already_set();

}

PyErr_Clear();

}

object CCachedProperty::bind(object self, object owner, str name)

{

CCachedProperty &pSelf = extract<CCachedProperty &>(self);

if (owner.is_none() && !name) {

BOOST_RAISE_EXCEPTION(

PyExc_ValueError,

"Must provide a name and an owner."

)

}

owner.attr(name) = self;

pSelf.__set_name__(owner, name);

return self;

}

void CCachedProperty::__set_name__(object owner, str name)

{

if (m_name || !m_owner.is_none())

{

const char *szName = extract<const char *>(str(".").join(make_tuple(m_owner.attr("__qualname__"), m_name)));

BOOST_RAISE_EXCEPTION(

PyExc_RuntimeError,

"This property was already bound as \"%s\".",

szName

)

}

m_name = name;

m_owner = owner;

}

object CCachedProperty::__get__(object self, object instance, object owner=object())

{

if (instance.is_none())

return self;

CCachedProperty &pSelf = extract<CCachedProperty &>(self);

object value;

try

{

value = pSelf.get_cached_value(instance);

}

catch (...)

{

if (!PyErr_ExceptionMatches(PyExc_KeyError))

throw_error_already_set();

PyErr_Clear();

object getter = pSelf.get_getter();

if (getter.is_none())

BOOST_RAISE_EXCEPTION(

PyExc_AttributeError,

"Unable to retrieve the value of a property that have no getter function."

);

value = getter(

*(make_tuple(handle<>(borrowed(instance.ptr()))) + pSelf.m_args),

**pSelf.m_kwargs

);

pSelf.set_cached_value(instance, value);

}

return value;

}

void CCachedProperty::__set__(object instance, object value)

{

if (m_fset.is_none())

BOOST_RAISE_EXCEPTION(

PyExc_AttributeError,

"Unable to assign the value of a property that have no setter function."

);

object result = m_fset(

*(make_tuple(handle<>(borrowed(instance.ptr())), value) + m_args),

**m_kwargs

);

if (!result.is_none())

set_cached_value(instance, result);

else

delete_cached_value(instance);

}

void CCachedProperty::__delete__(object instance)

{

if (!m_fdel.is_none())

m_fdel(

*(make_tuple(handle<>(borrowed(instance.ptr()))) + m_args),

**m_kwargs

);

delete_cached_value(instance);

}

object CCachedProperty::__call__(object self, object fget)

{

CCachedProperty &pSelf = extract<CCachedProperty &>(self);

pSelf.set_getter(fget);

return self;

}

object CCachedProperty::__getitem__(str item)

{

return m_kwargs[item];

}

void CCachedProperty::__setitem__(str item, object value)

{

m_kwargs[item] = value;

}

CCachedProperty *CCachedProperty::wrap_descriptor(

object descriptor, object owner, str name,

boost::python::tuple args, object kwargs)

{

CCachedProperty *pProperty = new CCachedProperty(

descriptor.attr("__get__"), descriptor.attr("__set__"), descriptor.attr("__delete__"),

descriptor.attr("__doc__"), args, kwargs

);

pProperty->__set_name__(owner, name);

return pProperty;

}

Source.Python/src/core/modules/core/core_cache.cpp at master · srpg/Source.Python · GitHub

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