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module;
#include <boost/geometry/algorithms/append.hpp>
module routemon:gpx$impl;
import std;
import :gpx;
import :util;
import :xml;
using namespace std::literals::string_view_literals;
namespace routemon::gpx {
namespace v10 {
constexpr auto xmlns = "http://www.topografix.com/GPX/1/0"sv;
auto qname(std::string_view local) -> xml::qname_view {
return {.ns_uri = xmlns, .local = local};
}
auto parse_wpt(xml::executor_ref e, xml::attribute_view attrs) -> xml::parser<geo::point> {
auto parse_xml_double = [](std::string_view sv) -> std::optional<double> {
return util::parse_double(sv, std::chars_format::fixed);
};
auto mlat = std::optional<double>{};
auto mlon = std::optional<double>{};
for (auto const& [name, value] : attrs) {
if (name == qname("lat")) {
mlat = parse_xml_double(value);
} else if (name == qname("lon")) {
mlon = parse_xml_double(value);
}
}
if (!mlat || !mlon)
throw std::runtime_error{"expected valid latitude and longitude for waypoint"};
co_await xml::ignore_contents(e);
co_return geo::point{*mlon, *mlat};
}
auto parse_trkseg(xml::executor_ref e, xml::attribute_view) -> xml::parser<track_segment> {
auto s = track_segment{};
while (auto mwpt = co_await allow_element(e, qname("trkpt"), xml::hohalo<parse_wpt>()))
bgeo::append(s.waypoints, *mwpt);
co_return std::move(s);
}
auto parse_trk(xml::executor_ref e, xml::attribute_view) -> xml::parser<track> {
auto t = track{};
t.name = co_await allow_element(e, qname("name"), xml::hohalo<xml::read_string_contents>());
co_await allow_element(e, qname("cmt"), xml::hohalo<xml::ignore_element_contents>());
t.desc = co_await allow_element(e, qname("desc"), xml::hohalo<xml::read_string_contents>());
co_await xml::ignore_contents(e, /* until */ qname("trkseg"));
while (auto mseg = co_await allow_element(e, qname("trkseg"), xml::hohalo<parse_trkseg>()))
t.segments.push_back(std::move(*mseg));
co_return std::move(t);
}
auto parse_gpx(xml::executor_ref e, xml::attribute_view attrs) -> xml::parser<file> {
auto f = file{};
if (attrs.lookup(qname("version")) != "1.0"sv)
throw std::runtime_error{"expected GPX version to be 1.0"};
if (auto mcreator = attrs.lookup(qname("creator")))
f.creator = *mcreator;
else
throw std::runtime_error{"expected GPX file to have creator"};
f.meta.name = co_await allow_element(e, qname("name"), xml::hohalo<xml::read_string_contents>());
f.meta.desc = co_await allow_element(e, qname("desc"), xml::hohalo<xml::read_string_contents>());
co_await xml::ignore_contents(e, /* until */ qname("trk"));
while (auto mtrk = co_await allow_element(e, qname("trk"), xml::hohalo<parse_trk>()))
f.tracks.push_back(std::move(*mtrk));
co_await xml::ignore_contents(e);
co_return std::move(f);
}
} // namespace v10
namespace v11 {
constexpr auto xmlns = "http://www.topografix.com/GPX/1/1"sv;
auto qname(std::string_view local) -> xml::qname_view {
return {.ns_uri = xmlns, .local = local};
}
auto parse_metadata(xml::executor_ref e, xml::attribute_view) -> xml::parser<metadata> {
auto meta = metadata{};
meta.name = co_await allow_element(e, qname("name"), xml::hohalo<xml::read_string_contents>());
meta.desc = co_await allow_element(e, qname("desc"), xml::hohalo<xml::read_string_contents>());
co_await xml::ignore_contents(e);
co_return meta;
}
auto parse_wpt(xml::executor_ref e, xml::attribute_view attrs) -> xml::parser<geo::point> {
auto parse_xml_double = [](std::string_view sv) -> std::optional<double> {
return util::parse_double(sv, std::chars_format::fixed);
};
auto mlat = std::optional<double>{};
auto mlon = std::optional<double>{};
for (auto const& [name, value] : attrs) {
if (name == qname("lat")) {
mlat = parse_xml_double(value);
} else if (name == qname("lon")) {
mlon = parse_xml_double(value);
}
}
if (!mlat || !mlon)
throw std::runtime_error{"expected valid latitude and longitude for waypoint"};
co_await xml::ignore_contents(e);
co_return geo::point{*mlon, *mlat};
}
auto parse_trkseg(xml::executor_ref e, xml::attribute_view) -> xml::parser<track_segment> {
auto s = track_segment{};
while (auto mwpt = co_await allow_element(e, qname("trkpt"), xml::hohalo<parse_wpt>()))
bgeo::append(s.waypoints, *mwpt);
co_await allow_element(e, qname("extensions"), xml::hohalo<xml::ignore_element_contents>());
co_return std::move(s);
}
auto parse_trk(xml::executor_ref e, xml::attribute_view) -> xml::parser<track> {
auto t = track{};
t.name = co_await allow_element(e, qname("name"), xml::hohalo<xml::read_string_contents>());
co_await allow_element(e, qname("cmt"), xml::hohalo<xml::ignore_element_contents>());
t.desc = co_await allow_element(e, qname("desc"), xml::hohalo<xml::read_string_contents>());
co_await xml::ignore_contents(e, /* until */ qname("trkseg"));
while (auto mseg = co_await allow_element(e, qname("trkseg"), xml::hohalo<parse_trkseg>()))
t.segments.push_back(std::move(*mseg));
co_return std::move(t);
}
auto parse_gpx(xml::executor_ref e, xml::attribute_view attrs) -> xml::parser<file> {
auto f = file{};
if (attrs.lookup(qname("version")) != "1.1"sv)
throw std::runtime_error{"expected GPX version to be 1.1"};
if (auto mcreator = attrs.lookup(qname("creator")))
f.creator = *mcreator;
else
throw std::runtime_error{"expected GPX file to have creator"};
if (auto mmeta = co_await allow_element(e, qname("metadata"), xml::hohalo<parse_metadata>()))
f.meta = *mmeta;
co_await xml::ignore_contents(e, /* until */ qname("trk"));
while (auto mtrk = co_await allow_element(e, qname("trk"), xml::hohalo<parse_trk>()))
f.tracks.push_back(std::move(*mtrk));
co_await allow_element(e, qname("extensions"), xml::hohalo<xml::ignore_element_contents>());
co_return std::move(f);
}
} // namespace v11
auto parse_file(xml::executor_ref e) -> xml::parser<file> {
auto decl = co_await expect_event<xml::xml_decl_event>(e);
if (decl.version != "1.0"sv)
throw std::runtime_error{std::format("unsupported XML version, got {}", std::string_view{decl.version})};
if (decl.encoding != "UTF-8"sv)
throw std::runtime_error{"unsupported encoding"};
if (auto mf = co_await allow_element(e, v10::qname("gpx"), xml::hohalo<v10::parse_gpx>()))
co_return std::move(*mf);
if (auto mf = co_await allow_element(e, v11::qname("gpx"), xml::hohalo<v11::parse_gpx>()))
co_return std::move(*mf);
throw std::runtime_error{"no supported GPX document found"};
}
reader::reader()
: p_{parse_file(util::not_null{&e_})}
{ e_.set_continuation(p_.promise().base_handle()); }
auto reader::init() -> void {
e_.start();
}
auto reader::put(std::string_view buf) -> void {
e_.read(buf, false);
}
auto reader::finish() -> gpx::file {
e_.read(std::string_view{}, true);
e_.end();
// Promise is still alive since the last coroutine performs a
// symmetric transfer to std::noop_coroutine() in final_suspend().
return std::move(p_.promise().returned_value());
}
} // namespace routemon::gpx
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