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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 <pybind11/pybind11.h>
#include <pybind11/operators.h>
#include <pybind11/stl.h>
#include "maths/arrow.h"
#include "../helpers.h"
#include "../docstrings/maths/arrow.h"
using pybind11::overload_cast;
using regina::Arrow;
using regina::Integer;
using regina::Laurent;
namespace {
// PythonType should be pybind11::list, pybind11::tuple, or pybind11::args.
//
// Only nElements will be extracted from arg. Typically nElements would be
// arg.size(); it may be smaller but it must not be larger.
template <typename PythonType>
Arrow::DiagramSequence sequenceArg(PythonType arg, size_t nElements) {
Arrow::DiagramSequence seq(nElements);
auto it = arg.begin();
try {
for (size_t i = 0; i < nElements; ++i)
seq[i] = pybind11::cast<size_t>(*it++);
} catch (pybind11::cast_error const&) {
throw regina::InvalidArgument("Diagram sequence contains an "
"element that is not convertible to a non-negative integer");
}
return seq;
}
}
void addArrow(pybind11::module_& m) {
RDOC_SCOPE_BEGIN(Arrow)
auto c = pybind11::class_<Arrow>(m, "Arrow", rdoc_scope)
.def(pybind11::init<>(), rdoc::__default)
.def(pybind11::init<const Arrow&>(), rdoc::__copy)
.def(pybind11::init([](pybind11::list arg) {
std::vector<std::pair<Arrow::DiagramSequence, Laurent<Integer>>>
data;
for (auto a : arg) {
try {
auto pair = pybind11::cast<std::pair<pybind11::list,
Laurent<Integer>>>(a);
data.emplace_back(
sequenceArg(pair.first, pair.first.size()),
std::move(pair.second));
} catch (pybind11::cast_error const&) {
try {
auto pair = pybind11::cast<std::pair<pybind11::list,
std::pair<long, std::vector<Integer>>>>(a);
data.emplace_back(
sequenceArg(pair.first, pair.first.size()),
Laurent<Integer>(pair.second.first,
pair.second.second.begin(),
pair.second.second.end()));
} catch (pybind11::cast_error const&) {
throw regina::InvalidArgument("Each element of the "
"given list should be a pair describing a diagram "
"sequence and a Laurent polynomial");
}
}
}
return Arrow(data.begin(), data.end());
}), rdoc::__init)
.def("init", overload_cast<>(&Arrow::init), rdoc::init)
.def("initDiagram", [](Arrow& arrow, pybind11::args args) {
arrow.initDiagram(sequenceArg(args, args.size()));
}, rdoc::initDiagram)
.def("isZero", &Arrow::isZero, rdoc::isZero)
.def("set", [](Arrow& arrow, pybind11::args args) {
size_t n = args.size();
if (n == 0)
throw regina::InvalidArgument("set() requires integer "
"arguments that represent a diagram sequence, "
"followed by a Laurent polynomial argument "
"representing the desired value");
try {
arrow.set(sequenceArg(args, n - 1),
pybind11::cast<Laurent<Integer>>(args[n - 1]));
} catch (pybind11::cast_error const&) {
throw regina::InvalidArgument("Final argument to set() "
"not convertible to a Laurent polynomial");
}
}, rdoc::set)
.def("swap", &Arrow::swap, rdoc::swap)
.def("shift", &Arrow::shift, rdoc::shift)
.def("scaleUp", &Arrow::scaleUp, rdoc::scaleUp)
.def("scaleDown", &Arrow::scaleDown, rdoc::scaleDown)
.def("negate", &Arrow::negate, rdoc::negate)
.def("invertA", &Arrow::invertA, rdoc::invertA)
.def("multDiagram", &Arrow::multDiagram, rdoc::multDiagram)
.def("sumLaurent", &Arrow::sumLaurent, rdoc::sumLaurent)
.def("__getitem__", [](const Arrow& arrow, pybind11::list arg) {
return arrow[sequenceArg(arg, arg.size())];
}, pybind11::return_value_policy::copy, // to enforce constness
rdoc::__array)
.def("__setitem__", [](Arrow& arrow, pybind11::list arg,
regina::Laurent<Integer> value) {
arrow.set(sequenceArg(arg, arg.size()), std::move(value));
}, pybind11::return_value_policy::copy, // to enforce constness
rdoc::__array)
.def(pybind11::self == Laurent<Integer>(), rdoc::__eq_2)
.def(pybind11::self *= Integer(), rdoc::__imul)
.def(pybind11::self *= Laurent<Integer>(), rdoc::__imul_2)
.def(pybind11::self += pybind11::self, rdoc::__iadd)
.def(pybind11::self -= pybind11::self, rdoc::__isub)
.def(pybind11::self *= pybind11::self, rdoc::__imul_3)
.def(pybind11::self * Integer(), rdoc_global::__mul)
.def(Integer() * pybind11::self, rdoc_global::__mul_2)
.def(pybind11::self * Laurent<Integer>(), rdoc_global::__mul_3)
.def(Laurent<Integer>() * pybind11::self, rdoc_global::__mul_4)
.def(pybind11::self + pybind11::self, rdoc_global::__add)
.def(pybind11::self - pybind11::self, rdoc_global::__sub_2)
.def(pybind11::self * pybind11::self, rdoc_global::__mul_5)
.def(- pybind11::self, rdoc_global::__sub)
;
regina::python::add_output(c);
regina::python::add_tight_encoding(c);
regina::python::add_eq_operators(c, rdoc::__eq);
regina::python::add_cmp_operators(c, rdoc::__cmp);
regina::python::add_global_swap<Arrow>(m, rdoc::global_swap);
RDOC_SCOPE_END
}
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