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#include <mbgl/style/conversion/geojson_options.hpp>
#include <mbgl/style/conversion_impl.hpp>
#include <mbgl/style/expression/dsl.hpp>
#include <sstream>
namespace mbgl {
namespace style {
namespace conversion {
optional<GeoJSONOptions> Converter<GeoJSONOptions>::operator()(const Convertible& value,
Error& error) const {
GeoJSONOptions options;
const auto minzoomValue = objectMember(value, "minzoom");
if (minzoomValue) {
if (toNumber(*minzoomValue)) {
options.minzoom = static_cast<uint8_t>(*toNumber(*minzoomValue));
} else {
error.message = "GeoJSON source minzoom value must be a number";
return nullopt;
}
}
const auto maxzoomValue = objectMember(value, "maxzoom");
if (maxzoomValue) {
if (toNumber(*maxzoomValue)) {
options.maxzoom = static_cast<uint8_t>(*toNumber(*maxzoomValue));
} else {
error.message = "GeoJSON source maxzoom value must be a number";
return nullopt;
}
}
const auto bufferValue = objectMember(value, "buffer");
if (bufferValue) {
if (toNumber(*bufferValue)) {
options.buffer = static_cast<uint16_t>(*toNumber(*bufferValue));
} else {
error.message = "GeoJSON source buffer value must be a number";
return nullopt;
}
}
const auto toleranceValue = objectMember(value, "tolerance");
if (toleranceValue) {
if (toNumber(*toleranceValue)) {
options.tolerance = static_cast<double>(*toNumber(*toleranceValue));
} else {
error.message = "GeoJSON source tolerance value must be a number";
return nullopt;
}
}
const auto clusterValue = objectMember(value, "cluster");
if (clusterValue) {
if (toBool(*clusterValue)) {
options.cluster = *toBool(*clusterValue);
} else {
error.message = "GeoJSON source cluster value must be a boolean";
return nullopt;
}
}
const auto clusterMaxZoomValue = objectMember(value, "clusterMaxZoom");
if (clusterMaxZoomValue) {
if (toNumber(*clusterMaxZoomValue)) {
options.clusterMaxZoom = static_cast<uint8_t>(*toNumber(*clusterMaxZoomValue));
} else {
error.message = "GeoJSON source clusterMaxZoom value must be a number";
return nullopt;
}
}
const auto clusterRadiusValue = objectMember(value, "clusterRadius");
if (clusterRadiusValue) {
if (toNumber(*clusterRadiusValue)) {
options.clusterRadius = static_cast<double>(*toNumber(*clusterRadiusValue));
} else {
error.message = "GeoJSON source clusterRadius value must be a number";
return nullopt;
}
}
const auto lineMetricsValue = objectMember(value, "lineMetrics");
if (lineMetricsValue) {
if (toBool(*lineMetricsValue)) {
options.lineMetrics = *toBool(*lineMetricsValue);
} else {
error.message = "GeoJSON source lineMetrics value must be a boolean";
return nullopt;
}
}
const auto clusterProperties = objectMember(value, "clusterProperties");
if (clusterProperties) {
if (!isObject(*clusterProperties)) {
error.message = "GeoJSON source clusterProperties value must be an object";
return nullopt;
}
GeoJSONOptions::ClusterProperties result;
assert(error.message.empty());
eachMember(
*clusterProperties,
[&](const std::string& k,
const mbgl::style::conversion::Convertible& v) -> optional<conversion::Error> {
// Each property shall be formed as ["key" : [operator, [mapExpression]]]
// or ["key" : [[operator, ['accumulated'], ['get', key]], [mapExpression]]]
if (!isArray(v) || arrayLength(v) != 2) {
error.message =
"GeoJSON source clusterProperties member must be an array with length of 2";
return nullopt;
}
auto map = expression::dsl::createExpression(arrayMember(v, 1));
if (!map) {
error.message =
"Failed to convert GeoJSON source clusterProperties map expression";
return nullopt;
}
std::unique_ptr<expression::Expression> reduce;
if (isArray(arrayMember(v, 0))) {
reduce = expression::dsl::createExpression(arrayMember(v, 0));
} else {
auto reduceOp = toString(arrayMember(v, 0));
if (!reduceOp) {
error.message =
"GeoJSON source clusterProperties member must contain a valid operator";
return nullopt;
}
std::stringstream ss;
// Reformulate reduce expression to [operator, ['accumulated'], ['get', key]]
// The reason to create expression via parsing string instead of invoking function
// createCompoundExpression is due to expression type disunity can’t be resolved
// with current logic of createCompoundExpression
ss << std::string(R"([")") << *reduceOp
<< std::string(R"(", ["accumulated"], ["get", ")") << k
<< std::string(R"("]])");
reduce = expression::dsl::createExpression(ss.str().c_str());
}
if (!reduce) {
error.message =
"Failed to convert GeoJSON source clusterProperties reduce expression";
return nullopt;
}
result.emplace(k, std::make_pair(std::move(map), std::move(reduce)));
return nullopt;
});
if (!error.message.empty()) {
return nullopt;
}
options.clusterProperties = std::move(result);
}
return { std::move(options) };
}
} // namespace conversion
} // namespace style
} // namespace mbgl
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