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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Python Interface *
* *
* Copyright (c) 1999-2025, Ben Burton *
* For further details contact Ben Burton (bab@debian.org). *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License as *
* published by the Free Software Foundation; either version 2 of the *
* License, or (at your option) any later version. *
* *
* As an exception, when this program is distributed through (i) the *
* App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or *
* (iii) Google Play by Google Inc., then that store may impose any *
* digital rights management, device limits and/or redistribution *
* restrictions that are required by its terms of service. *
* *
* 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 <https://www.gnu.org/licenses/>. *
* *
**************************************************************************/
#include "pythonoutputstream.h"
#include <pybind11/pybind11.h>
#include "../helpers/gil.h"
namespace regina::python {
void PythonOutputStream::write(const std::string& data) {
buffer.append(data);
auto pos = buffer.find('\n');
if (pos < buffer.length()) {
if (PyGILState_Check()) {
GILScopedRelease release;
do {
processOutput(buffer.substr(0, pos + 1));
buffer.erase(0, pos + 1);
pos = buffer.find('\n');
} while (pos < buffer.length());
} else {
do {
processOutput(buffer.substr(0, pos + 1));
buffer.erase(0, pos + 1);
pos = buffer.find('\n');
} while (pos < buffer.length());
}
}
}
void PythonOutputStream::flush() {
if (! buffer.empty()) {
if (PyGILState_Check()) {
GILScopedRelease release;
processOutput(buffer);
} else {
processOutput(buffer);
}
buffer.clear();
}
}
void PythonOutputStream::addBindings() {
pybind11::class_<PythonOutputStream>(pybind11::handle(),
"PythonOutputStream")
.def("write", &PythonOutputStream::write)
.def("flush", &PythonOutputStream::flush);
}
void PythonOutputStream::install(const char* streamName) {
// Create a python wrapper for this custom stream.
pybind11::object stream = pybind11::cast(this,
pybind11::return_value_policy::reference);
if (! stream.ptr())
throw std::runtime_error(
std::string("Could not create pybind11 wrapper for sys.")
+ streamName);
// Redirect the system output stream to our custom stream wrapper.
if (PySys_SetObject(const_cast<char*>(streamName), stream.ptr())) {
PyErr_Print();
PyErr_Clear();
throw std::runtime_error(
std::string("Failed to set sys.") + streamName);
}
}
} // namespace regina::python
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