1 files changed, 175 insertions, 0 deletions
diff --git a/src/mbgl/style/conversion/source.cpp b/src/mbgl/style/conversion/source.cpp
new file mode 100644
index 0000000000..c10d0babcf
--- /dev/null
+++ b/src/mbgl/style/conversion/source.cpp
@@ -0,0 +1,175 @@
+#include <mbgl/style/conversion/source.hpp>
+#include <mbgl/style/conversion/coordinate.hpp>
+#include <mbgl/style/conversion/geojson.hpp>
+#include <mbgl/style/conversion/geojson_options.hpp>
+#include <mbgl/style/conversion/tileset.hpp>
+#include <mbgl/style/sources/geojson_source.hpp>
+#include <mbgl/style/sources/raster_source.hpp>
+#include <mbgl/style/sources/vector_source.hpp>
+#include <mbgl/style/sources/image_source.hpp>
+#include <mbgl/util/geo.hpp>
+
+namespace mbgl {
+namespace style {
+namespace conversion {
+
+// A tile source can either specify a URL to TileJSON, or inline TileJSON.
+static optional<variant<std::string, Tileset>> convertURLOrTileset(const Convertible& value, Error& error) {
+    auto urlVal = objectMember(value, "url");
+    if (!urlVal) {
+        optional<Tileset> tileset = convert<Tileset>(value, error);
+        if (!tileset) {
+            return {};
+        }
+        return { *tileset };
+    }
+
+    optional<std::string> url = toString(*urlVal);
+    if (!url) {
+        error = { "source url must be a string" };
+        return {};
+    }
+
+    return { *url };
+}
+
+static optional<std::unique_ptr<Source>> convertRasterSource(const std::string& id,
+                                                             const Convertible& value,
+                                                             Error& error) {
+    optional<variant<std::string, Tileset>> urlOrTileset = convertURLOrTileset(value, error);
+    if (!urlOrTileset) {
+        return {};
+    }
+
+    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()) {
+            error = { "invalid tileSize" };
+            return {};
+        }
+        tileSize = *size;
+    }
+
+    return { std::make_unique<RasterSource>(id, std::move(*urlOrTileset), tileSize) };
+}
+
+static optional<std::unique_ptr<Source>> convertVectorSource(const std::string& id,
+                                                             const Convertible& value,
+                                                             Error& error) {
+    optional<variant<std::string, Tileset>> urlOrTileset = convertURLOrTileset(value, error);
+    if (!urlOrTileset) {
+        return {};
+    }
+
+    return { std::make_unique<VectorSource>(id, std::move(*urlOrTileset)) };
+}
+
+static optional<std::unique_ptr<Source>> convertGeoJSONSource(const std::string& id,
+                                                              const Convertible& value,
+                                                              Error& error) {
+    auto dataValue = objectMember(value, "data");
+    if (!dataValue) {
+        error = { "GeoJSON source must have a data value" };
+        return {};
+    }
+
+    optional<GeoJSONOptions> options = convert<GeoJSONOptions>(value, error);
+    if (!options) {
+        return {};
+    }
+
+    auto result = std::make_unique<GeoJSONSource>(id, *options);
+
+    if (isObject(*dataValue)) {
+        optional<GeoJSON> geoJSON = convert<GeoJSON>(*dataValue, error);
+        if (!geoJSON) {
+            return {};
+        }
+        result->setGeoJSON(std::move(*geoJSON));
+    } else if (toString(*dataValue)) {
+        result->setURL(*toString(*dataValue));
+    } else {
+        error = { "GeoJSON data must be a URL or an object" };
+        return {};
+    }
+
+    return { std::move(result) };
+}
+
+static optional<std::unique_ptr<Source>> convertImageSource(const std::string& id,
+                                                            const Convertible& value,
+                                                            Error& error) {
+    auto urlValue = objectMember(value, "url");
+    if (!urlValue) {
+        error = { "Image source must have a url value" };
+        return {};
+    }
+    
+    auto urlString = toString(*urlValue);
+    if (!urlString) {
+        error = { "Image url must be a URL string" };
+        return {};
+    }
+    
+    auto coordinatesValue = objectMember(value, "coordinates");
+    if (!coordinatesValue) {
+        error = { "Image source must have a coordinates values" };
+        return {};
+    }
+    
+    if (!isArray(*coordinatesValue) || arrayLength(*coordinatesValue) != 4) {
+        error = { "Image coordinates must be an array of four longitude latitude pairs" };
+        return {};
+    }
+    
+    std::array<LatLng, 4> coordinates;
+    for (std::size_t i=0; i < 4; i++) {
+        auto latLng = conversion::convert<LatLng>(arrayMember(*coordinatesValue,i), error);
+        if (!latLng) {
+            return {};
+        }
+        coordinates[i] = *latLng;
+    }
+    auto result = std::make_unique<ImageSource>(id, coordinates);
+    result->setURL(*urlString);
+
+    return { std::move(result) };
+}
+
+optional<std::unique_ptr<Source>> Converter<std::unique_ptr<Source>>::operator()(const Convertible& value, Error& error, const std::string& id) const {
+    if (!isObject(value)) {
+        error = { "source must be an object" };
+        return {};
+    }
+
+    auto typeValue = objectMember(value, "type");
+    if (!typeValue) {
+        error = { "source must have a type" };
+        return {};
+    }
+
+    optional<std::string> type = toString(*typeValue);
+    if (!type) {
+        error = { "source type must be a string" };
+        return {};
+    }
+
+    if (*type == "raster") {
+        return convertRasterSource(id, value, error);
+    } else if (*type == "vector") {
+        return convertVectorSource(id, value, error);
+    } else if (*type == "geojson") {
+        return convertGeoJSONSource(id, value, error);
+    } else if (*type == "image") {
+        return convertImageSource(id, value, error);
+    } else {
+        error = { "invalid source type" };
+        return {};
+    }
+}
+
+} // namespace conversion
+} // namespace style
+} // namespace mbgl