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#pragma once
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/conversion/geojson.hpp>
#include <mbgl/style/conversion/geojson_options.hpp>
#include <mbgl/style/conversion/tileset.hpp>
#include <mbgl/style/source.hpp>
#include <mbgl/style/sources/geojson_source.hpp>
#include <mbgl/style/sources/raster_source.hpp>
#include <mbgl/style/sources/vector_source.hpp>
namespace mbgl {
namespace style {
namespace conversion {
template <>
struct Converter<std::unique_ptr<Source>> {
public:
template <class V>
Result<std::unique_ptr<Source>> operator()(const V& value, const std::string& id) const {
if (!isObject(value)) {
return Error{ "source must be an object" };
}
auto typeValue = objectMember(value, "type");
if (!typeValue) {
return Error{ "source must have a type" };
}
optional<std::string> type = toString(*typeValue);
if (!type) {
return Error{ "source type must be a string" };
}
if (*type == "raster") {
return convertRasterSource(id, value);
} else if (*type == "vector") {
return convertVectorSource(id, value);
} else if (*type == "geojson") {
return convertGeoJSONSource(id, value);
} else {
return Error{ "invalid source type" };
}
}
private:
// A tile source can either specify a URL to TileJSON, or inline TileJSON.
template <class V>
Result<variant<std::string, Tileset>> convertURLOrTileset(const V& value) const {
auto urlVal = objectMember(value, "url");
if (!urlVal) {
Result<Tileset> tileset = convert<Tileset>(value);
if (!tileset) {
return tileset.error();
}
return *tileset;
}
optional<std::string> url = toString(*urlVal);
if (!url) {
return Error{ "source url must be a string" };
}
return *url;
}
template <class V>
Result<std::unique_ptr<Source>> convertRasterSource(const std::string& id,
const V& value) const {
Result<variant<std::string, Tileset>> urlOrTileset = convertURLOrTileset(value);
if (!urlOrTileset) {
return urlOrTileset.error();
}
uint16_t tileSize = util::tileSize;
auto tileSizeValue = objectMember(value, "tileSize");
if (tileSizeValue) {
optional<float> size = toNumber(*tileSizeValue);
if (!size || *size < 0 || *size > std::numeric_limits<uint16_t>::max()) {
return Error{ "invalid tileSize" };
}
tileSize = *size;
}
return std::make_unique<RasterSource>(id, std::move(*urlOrTileset), tileSize);
}
template <class V>
Result<std::unique_ptr<Source>> convertVectorSource(const std::string& id,
const V& value) const {
Result<variant<std::string, Tileset>> urlOrTileset = convertURLOrTileset(value);
if (!urlOrTileset) {
return urlOrTileset.error();
}
return std::make_unique<VectorSource>(id, std::move(*urlOrTileset));
}
template <class V>
Result<std::unique_ptr<Source>> convertGeoJSONSource(const std::string& id,
const V& value) const {
auto dataValue = objectMember(value, "data");
if (!dataValue) {
return Error{ "GeoJSON source must have a data value" };
}
Result<GeoJSONOptions> options = convert<GeoJSONOptions>(value);
if (!options) {
return options.error();
}
auto result = std::make_unique<GeoJSONSource>(id, *options);
if (isObject(*dataValue)) {
Result<GeoJSON> geoJSON = convertGeoJSON(*dataValue);
if (!geoJSON) {
return geoJSON.error();
}
result->setGeoJSON(std::move(*geoJSON));
} else if (toString(*dataValue)) {
result->setURL(*toString(*dataValue));
} else {
return Error{ "GeoJSON data must be a URL or an object" };
}
return std::move(result);
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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