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Diffstat (limited to 'src/mbgl/style/function/expression.cpp')
-rw-r--r-- | src/mbgl/style/function/expression.cpp | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/mbgl/style/function/expression.cpp b/src/mbgl/style/function/expression.cpp new file mode 100644 index 0000000000..c620b0bb22 --- /dev/null +++ b/src/mbgl/style/function/expression.cpp @@ -0,0 +1,49 @@ +#include <mbgl/style/function/expression.hpp> +#include <mbgl/tile/geometry_tile_data.hpp> + +namespace mbgl { +namespace style { +namespace expression { + +class GeoJSONFeature : public GeometryTileFeature { +public: + const Feature& feature; + + GeoJSONFeature(const Feature& feature_) + : feature(feature_) { + } + + FeatureType getType() const override { + return apply_visitor(ToFeatureType(), feature.geometry); + } + + PropertyMap getProperties() const override { + return feature.properties; + } + + optional<FeatureIdentifier> getID() const override { + return feature.id; + } + + GeometryCollection getGeometries() const override { + return {}; + } + + optional<Value> getValue(const std::string& key) const override { + auto it = feature.properties.find(key); + if (it != feature.properties.end()) { + return optional<Value>(it->second); + } + return optional<Value>(); + } +}; + +optional<OutputValue> Expression::evaluate(float z, const Feature& feature, Error& error) const { + std::unique_ptr<const GeometryTileFeature> f = std::make_unique<const GeoJSONFeature>(feature); + return this->evaluate(z, *f, error); +} + + +} // namespace expression +} // namespace style +} // namespace mbgl |