1 files changed, 206 insertions, 0 deletions
diff --git a/src/mbgl/style/conversion/layer.cpp b/src/mbgl/style/conversion/layer.cpp
new file mode 100644
index 0000000000..0ca582f8dc
--- /dev/null
+++ b/src/mbgl/style/conversion/layer.cpp
@@ -0,0 +1,206 @@
+#include <mbgl/style/conversion/layer.hpp>
+#include <mbgl/style/conversion/constant.hpp>
+#include <mbgl/style/conversion/filter.hpp>
+#include <mbgl/style/conversion/make_property_setters.hpp>
+#include <mbgl/style/layers/background_layer.hpp>
+#include <mbgl/style/layers/circle_layer.hpp>
+#include <mbgl/style/layers/fill_layer.hpp>
+#include <mbgl/style/layers/fill_extrusion_layer.hpp>
+#include <mbgl/style/layers/line_layer.hpp>
+#include <mbgl/style/layers/raster_layer.hpp>
+#include <mbgl/style/layers/symbol_layer.hpp>
+
+namespace mbgl {
+namespace style {
+namespace conversion {
+
+optional<Error> setLayoutProperty(Layer& layer, const std::string& name, const Convertible& value) {
+    static const auto setters = makeLayoutPropertySetters();
+    auto it = setters.find(name);
+    if (it == setters.end()) {
+        return Error { "property not found" };
+    }
+    return it->second(layer, value);
+}
+
+optional<Error> setPaintProperty(Layer& layer, const std::string& name, const Convertible& value) {
+    static const auto setters = makePaintPropertySetters();
+    auto it = setters.find(name);
+    if (it == setters.end()) {
+        return Error { "property not found" };
+    }
+    return it->second(layer, value);
+}
+
+optional<Error> setPaintProperties(Layer& layer, const Convertible& value) {
+    auto paintValue = objectMember(value, "paint");
+    if (!paintValue) {
+        return {};
+    }
+    return eachMember(*paintValue, [&] (const std::string& k, const Convertible& v) {
+        return setPaintProperty(layer, k, v);
+    });
+}
+
+template <class LayerType>
+optional<std::unique_ptr<Layer>> convertVectorLayer(const std::string& id, const Convertible& value, Error& error) {
+    auto sourceValue = objectMember(value, "source");
+    if (!sourceValue) {
+        error = { "layer must have a source" };
+        return {};
+    }
+
+    optional<std::string> source = toString(*sourceValue);
+    if (!source) {
+        error = { "layer source must be a string" };
+        return {};
+    }
+
+    std::unique_ptr<LayerType> layer = std::make_unique<LayerType>(id, *source);
+
+    auto sourceLayerValue = objectMember(value, "source-layer");
+    if (sourceLayerValue) {
+        optional<std::string> sourceLayer = toString(*sourceLayerValue);
+        if (!sourceLayer) {
+            error = { "layer source-layer must be a string" };
+            return {};
+        }
+        layer->setSourceLayer(*sourceLayer);
+    }
+
+    auto filterValue = objectMember(value, "filter");
+    if (filterValue) {
+        optional<Filter> filter = convert<Filter>(*filterValue, error);
+        if (!filter) {
+            return {};
+        }
+        layer->setFilter(*filter);
+    }
+
+    return { std::move(layer) };
+}
+
+static optional<std::unique_ptr<Layer>> convertRasterLayer(const std::string& id, const Convertible& value, Error& error) {
+    auto sourceValue = objectMember(value, "source");
+    if (!sourceValue) {
+        error = { "layer must have a source" };
+        return {};
+    }
+
+    optional<std::string> source = toString(*sourceValue);
+    if (!source) {
+        error = { "layer source must be a string" };
+        return {};
+    }
+
+    return { std::make_unique<RasterLayer>(id, *source) };
+}
+
+static optional<std::unique_ptr<Layer>> convertBackgroundLayer(const std::string& id, const Convertible&, Error&) {
+    return { std::make_unique<BackgroundLayer>(id) };
+}
+
+optional<std::unique_ptr<Layer>> Converter<std::unique_ptr<Layer>>::operator()(const Convertible& value, Error& error) const {
+    if (!isObject(value)) {
+        error = { "layer must be an object" };
+        return {};
+    }
+
+    auto idValue = objectMember(value, "id");
+    if (!idValue) {
+        error = { "layer must have an id" };
+        return {};
+    }
+
+    optional<std::string> id = toString(*idValue);
+    if (!id) {
+        error = { "layer id must be a string" };
+        return {};
+    }
+
+    auto typeValue = objectMember(value, "type");
+    if (!typeValue) {
+        error = { "layer must have a type" };
+        return {};
+    }
+
+    optional<std::string> type = toString(*typeValue);
+    if (!type) {
+        error = { "layer type must be a string" };
+        return {};
+    }
+
+    optional<std::unique_ptr<Layer>> converted;
+
+    if (*type == "fill") {
+        converted = convertVectorLayer<FillLayer>(*id, value, error);
+    } else if (*type == "fill-extrusion") {
+        converted = convertVectorLayer<FillExtrusionLayer>(*id, value, error);
+    } else if (*type == "line") {
+        converted = convertVectorLayer<LineLayer>(*id, value, error);
+    } else if (*type == "circle") {
+        converted = convertVectorLayer<CircleLayer>(*id, value, error);
+    } else if (*type == "symbol") {
+        converted = convertVectorLayer<SymbolLayer>(*id, value, error);
+    } else if (*type == "raster") {
+        converted = convertRasterLayer(*id, value, error);
+    } else if (*type == "background") {
+        converted = convertBackgroundLayer(*id, value, error);
+    } else {
+        error = { "invalid layer type" };
+        return {};
+    }
+
+    if (!converted) {
+        return converted;
+    }
+
+    std::unique_ptr<Layer> layer = std::move(*converted);
+
+    auto minzoomValue = objectMember(value, "minzoom");
+    if (minzoomValue) {
+        optional<float> minzoom = toNumber(*minzoomValue);
+        if (!minzoom) {
+            error = { "minzoom must be numeric" };
+            return {};
+        }
+        layer->setMinZoom(*minzoom);
+    }
+
+    auto maxzoomValue = objectMember(value, "maxzoom");
+    if (maxzoomValue) {
+        optional<float> maxzoom = toNumber(*maxzoomValue);
+        if (!maxzoom) {
+            error = { "maxzoom must be numeric" };
+            return {};
+        }
+        layer->setMaxZoom(*maxzoom);
+    }
+
+    auto layoutValue = objectMember(value, "layout");
+    if (layoutValue) {
+        if (!isObject(*layoutValue)) {
+            error = { "layout must be an object" };
+            return {};
+        }
+        optional<Error> error_ = eachMember(*layoutValue, [&] (const std::string& k, const Convertible& v) {
+            return setLayoutProperty(*layer, k, v);
+        });
+        if (error_) {
+            error = *error_;
+            return {};
+        }
+    }
+
+    optional<Error> error_ = setPaintProperties(*layer, value);
+    if (error_) {
+        error = *error_;
+        return {};
+    }
+
+    return std::move(layer);
+}
+
+} // namespace conversion
+} // namespace style
+} // namespace mbgl