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/*
pybind11/detail/exception_translation.h: means to translate C++ exceptions to Python exceptions
Copyright (c) 2024 The Pybind Development Team.
All rights reserved. Use of this source code is governed by a
BSD-style license that can be found in the LICENSE file.
*/
#pragma once
#include "common.h"
#include "internals.h"
PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
PYBIND11_NAMESPACE_BEGIN(detail)
// Apply all the extensions translators from a list
// Return true if one of the translators completed without raising an exception
// itself. Return of false indicates that if there are other translators
// available, they should be tried.
inline bool apply_exception_translators(std::forward_list<ExceptionTranslator> &translators) {
auto last_exception = std::current_exception();
for (auto &translator : translators) {
try {
translator(last_exception);
return true;
} catch (...) {
last_exception = std::current_exception();
}
}
return false;
}
inline void try_translate_exceptions() {
/* When an exception is caught, give each registered exception
translator a chance to translate it to a Python exception. First
all module-local translators will be tried in reverse order of
registration. If none of the module-locale translators handle
the exception (or there are no module-locale translators) then
the global translators will be tried, also in reverse order of
registration.
A translator may choose to do one of the following:
- catch the exception and call py::set_error()
to set a standard (or custom) Python exception, or
- do nothing and let the exception fall through to the next translator, or
- delegate translation to the next translator by throwing a new type of exception.
*/
bool handled = with_internals([&](internals &internals) {
auto &local_exception_translators = get_local_internals().registered_exception_translators;
if (detail::apply_exception_translators(local_exception_translators)) {
return true;
}
auto &exception_translators = internals.registered_exception_translators;
if (detail::apply_exception_translators(exception_translators)) {
return true;
}
return false;
});
if (!handled) {
set_error(PyExc_SystemError, "Exception escaped from default exception translator!");
}
}
PYBIND11_NAMESPACE_END(detail)
PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)
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