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/* SPDX-License-Identifier: BSD-2-Clause
*
* This file is part of pyosmium. (https://osmcode.org/pyosmium/)
*
* Copyright (C) 2025 Sarah Hoffmann <lonvia@denofr.de> and others.
* For a full list of authors see the git log.
*/
#include <pybind11/pybind11.h>
#include <pybind11/stl/filesystem.h>
#include <osmium/osm.hpp>
#include <osmium/io/any_input.hpp>
#include <osmium/index/nwr_array.hpp>
#include <osmium/index/id_set.hpp>
#include <osmium/thread/pool.hpp>
#include "base_filter.h"
#include "osmium_module.h"
#include <filesystem>
namespace py = pybind11;
namespace {
using IdType = osmium::unsigned_object_id_type;
using IdSet = osmium::index::IdSetDense<IdType>;
class IdTracker
{
public:
void add_references(py::object const &obj)
{
if (py::hasattr(obj, "nodes")) {
auto const nlist = py::getattr(obj, "nodes");
for (auto const ref : nlist) {
auto const attr = py::getattr(ref, "ref", py::none());
m_ids.nodes().set(attr.is_none() ? ref.cast<IdType>()
: attr.cast<IdType>());
}
} else if (py::hasattr(obj, "members")) {
auto const mlist = py::getattr(obj, "members");
for (auto const member: mlist) {
std::string mtype;
IdType id;
if (py::isinstance<py::tuple>(member)) {
auto const t = member.cast<py::tuple>();
mtype = t[0].cast<std::string>();
id = t[1].cast<IdType>();
} else {
mtype = member.attr("type").cast<std::string>();
id = member.attr("ref").cast<IdType>();
}
// ignore unknown types
if (mtype.length() == 1
&& (mtype.front() == 'n' || mtype.front() == 'w'
|| mtype.front() == 'r')) {
m_ids(osmium::char_to_item_type(mtype.front())).set(id);
}
}
}
}
bool contains_any_references(py::object const &obj) const
{
if (py::hasattr(obj, "nodes")) {
auto const nlist = py::getattr(obj, "nodes");
for (auto const ref : nlist) {
auto const attr = py::getattr(ref, "ref", py::none());
if (m_ids.nodes().get(attr.is_none() ? ref.cast<IdType>()
: attr.cast<IdType>())) {
return true;
}
}
return false;
}
if (py::hasattr(obj, "members")) {
auto const mlist = py::getattr(obj, "members");
for (auto const member: mlist) {
std::string mtype;
IdType id;
if (py::isinstance<py::tuple>(member)) {
auto const t = member.cast<py::tuple>();
mtype = t[0].cast<std::string>();
id = t[1].cast<IdType>();
} else {
mtype = member.attr("type").cast<std::string>();
id = member.attr("ref").cast<IdType>();
}
if (m_ids(osmium::char_to_item_type(mtype.front())).get(id)) {
return true;
}
}
}
return false;
}
void complete_backward_references(osmium::io::File file, int relation_depth)
{
osmium::thread::Pool thread_pool{};
// first pass: relations
while (relation_depth > 0 && !m_ids.relations().empty()) {
bool need_recurse = false;
osmium::io::Reader rd{file, osmium::osm_entity_bits::relation, thread_pool};
while (auto const buffer = rd.read()) {
for (auto const &rel: buffer.select<osmium::Relation>()) {
if (m_ids.relations().get(rel.id())) {
for (auto const &member: rel.members()) {
if (member.type() == osmium::item_type::relation
&& !m_ids.relations().get(member.ref())) {
need_recurse = true;
}
m_ids(member.type()).set(member.ref());
}
}
}
}
if (!need_recurse) {
break;
}
--relation_depth;
}
// second pass: ways
if (!m_ids.ways().empty()) {
osmium::io::Reader rd{file, osmium::osm_entity_bits::way, thread_pool};
while (auto const buffer = rd.read()) {
for (auto const &way: buffer.select<osmium::Way>()) {
if (m_ids.ways().get(way.id())) {
for (auto const &nd: way.nodes()) {
m_ids.nodes().set(nd.ref());
}
}
}
}
}
}
void complete_forward_references(osmium::io::File file, int relation_depth)
{
osmium::thread::Pool thread_pool{};
// standard pass: find directly referenced ways and relations
{
auto entities = osmium::osm_entity_bits::way;
if (relation_depth >= 0) {
entities |= osmium::osm_entity_bits::relation;
}
osmium::io::Reader rd{file, entities, thread_pool};
while (auto const buffer = rd.read()) {
for (auto const &object: buffer.select<osmium::OSMObject>()) {
if (object.type() == osmium::item_type::way) {
const auto& way = static_cast<const osmium::Way&>(object);
for (const auto& nr : way.nodes()) {
if (m_ids(osmium::item_type::node).get(nr.positive_ref())) {
m_ids(osmium::item_type::way).set(way.id());
break;
}
}
} else if (object.type() == osmium::item_type::relation) {
const auto& relation = static_cast<const osmium::Relation&>(object);
for (const auto& member : relation.members()) {
if (member.type() != osmium::item_type::relation) {
if (m_ids(member.type()).get(member.positive_ref())) {
m_ids(osmium::item_type::relation).set(relation.id());
break;
}
}
}
}
}
}
}
// recursive passes: find additional referenced relations
while (relation_depth > 0 && !m_ids.relations().empty()) {
bool need_recurse = false;
osmium::io::Reader rd{file, osmium::osm_entity_bits::relation, thread_pool};
while (auto const buffer = rd.read()) {
for (auto const &rel: buffer.select<osmium::Relation>()) {
if (!m_ids.relations().get(rel.id())) {
for (auto const &member: rel.members()) {
if (member.type() == osmium::item_type::relation
&& m_ids.relations().get(member.ref())) {
need_recurse = true;
m_ids(member.type()).set(rel.id());
break;
}
}
}
}
}
if (!need_recurse) {
break;
}
--relation_depth;
}
}
IdSet const &node_ids() const { return m_ids.nodes(); }
IdSet const &way_ids() const { return m_ids.ways(); }
IdSet const &relation_ids() const { return m_ids.relations(); }
IdSet const &ids(osmium::item_type itype) const { return m_ids(itype); }
IdSet &node_ids() { return m_ids.nodes(); }
IdSet &way_ids() { return m_ids.ways(); }
IdSet &relation_ids() { return m_ids.relations(); }
private:
osmium::nwr_array<IdSet> m_ids;
};
class IdTrackerFilter : public pyosmium::BaseFilter
{
public:
IdTrackerFilter(IdTracker const &tracker)
: m_tracker(tracker)
{
m_enabled_for = osmium::osm_entity_bits::nwr;
}
protected:
bool filter_node(pyosmium::PyOSMNode &o) override {
return !m_tracker.node_ids().get(o.get()->id());
}
bool filter_way(pyosmium::PyOSMWay &o) override {
return !m_tracker.way_ids().get(o.get()->id());
}
bool filter_relation(pyosmium::PyOSMRelation &o) override {
return !m_tracker.relation_ids().get(o.get()->id());
}
private:
IdTracker const &m_tracker;
};
class IdContainsFilter : public pyosmium::BaseFilter
{
public:
IdContainsFilter(IdTracker const &tracker)
: m_tracker(tracker)
{
m_enabled_for = osmium::osm_entity_bits::way | osmium::osm_entity_bits::relation;
}
protected:
bool filter_way(pyosmium::PyOSMWay &o) override {
for (auto const &node : o.get()->nodes()) {
if (m_tracker.node_ids().get(node.ref())) {
return false;
}
}
return true;
}
bool filter_relation(pyosmium::PyOSMRelation &o) override {
for (auto const &member: o.get()->members()) {
if (m_tracker.ids(member.type()).get(member.ref())) {
return false;
}
}
return true;
}
private:
IdTracker const &m_tracker;
};
} // namespace
namespace pyosmium {
void init_id_tracker(pybind11::module &m)
{
py::class_<IdTrackerFilter, BaseFilter, BaseHandler>(m, "IdTrackerIdFilter")
;
py::class_<IdContainsFilter, BaseFilter, BaseHandler>(m, "IdTrackerContainsFilter")
;
py::class_<IdTracker>(m, "IdTracker")
.def(py::init<>())
.def("add_node", [](IdTracker &self, IdType id) { self.node_ids().set(id); })
.def("add_way", [](IdTracker &self, IdType id) { self.way_ids().set(id); })
.def("add_relation", [](IdTracker &self, IdType id) { self.relation_ids().set(id); })
.def("add_references", &IdTracker::add_references)
.def("contains_any_references", &IdTracker::contains_any_references)
.def("complete_backward_references", &IdTracker::complete_backward_references,
py::arg("fname"), py::arg("relation_depth") = 0)
.def("complete_backward_references",
[](IdTracker &self, char const *fname, int relation_depth) {
self.complete_backward_references(osmium::io::File{fname}, relation_depth);
},
py::arg("fname"), py::arg("relation_depth") = 0)
.def("complete_backward_references",
[](IdTracker &self, std::filesystem::path const &fname, int relation_depth) {
self.complete_backward_references(osmium::io::File{fname.string()}, relation_depth);
},
py::arg("fname"), py::arg("relation_depth") = 0)
.def("complete_forward_references", &IdTracker::complete_forward_references,
py::arg("fname"), py::arg("relation_depth") = 0)
.def("complete_forward_references",
[](IdTracker &self, char const *fname, int relation_depth) {
self.complete_forward_references(osmium::io::File{fname}, relation_depth);
},
py::arg("fname"), py::arg("relation_depth") = 0)
.def("complete_forward_references",
[](IdTracker &self, std::filesystem::path const &fname, int relation_depth) {
self.complete_forward_references(osmium::io::File{fname.string()}, relation_depth);
},
py::arg("fname"), py::arg("relation_depth") = 0)
.def("id_filter",
[](IdTracker const &self) { return new IdTrackerFilter(self); },
py::keep_alive<0, 1>())
.def("contains_filter",
[](IdTracker const &self) { return new IdContainsFilter(self); },
py::keep_alive<0, 1>())
.def("node_ids", (IdSet& (IdTracker::*)()) &IdTracker::node_ids,
py::return_value_policy::reference_internal)
.def("way_ids", (IdSet& (IdTracker::*)()) &IdTracker::way_ids,
py::return_value_policy::reference_internal)
.def("relation_ids", (IdSet& (IdTracker::*)()) &IdTracker::relation_ids,
py::return_value_policy::reference_internal)
;
}
} // namespace
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