1 files changed, 67 insertions, 0 deletions
diff --git a/src/mbgl/style/expression/image.cpp b/src/mbgl/style/expression/image.cpp
new file mode 100644
index 0000000000..1dc7acde56
--- /dev/null
+++ b/src/mbgl/style/expression/image.cpp
@@ -0,0 +1,67 @@
+#include <mbgl/style/conversion/constant.hpp>
+#include <mbgl/style/conversion_impl.hpp>
+#include <mbgl/style/expression/image.hpp>
+
+namespace mbgl {
+namespace style {
+namespace expression {
+
+Image::Image(std::string imageID_, bool available_) : imageID(std::move(imageID_)), available(available_) {}
+
+Image::Image(std::string imageID_) : Image(std::move(imageID_), false) {}
+
+Image::Image(const char* imageID_) : Image(std::string(imageID_)) {
+    assert(imageID_);
+}
+
+bool Image::operator==(const Image& other) const {
+    return imageID == other.imageID && available == other.available;
+}
+
+mbgl::Value Image::toValue() const {
+    return mapbox::base::ValueObject{{"name", imageID}, {"available", available}};
+}
+
+const std::string& Image::id() const {
+    return imageID;
+}
+
+bool Image::isAvailable() const {
+    return available;
+}
+
+bool Image::empty() const {
+    return imageID.empty();
+}
+
+} // namespace expression
+
+namespace conversion {
+using namespace mbgl::style::expression;
+optional<Image> Converter<Image>::operator()(const Convertible& value, Error& error) const {
+    if (isArray(value)) {
+        Convertible imageParameters = arrayMember(value, 0);
+        std::size_t imageParametersLength = arrayLength(imageParameters);
+        if (imageParametersLength < 1) {
+            error.message = "Image has to contain an ID.";
+            return nullopt;
+        }
+
+        optional<std::string> imageID = toString(arrayMember(imageParameters, 0));
+        if (!imageID) {
+            error.message = "Image has to contain an ID.";
+            return nullopt;
+        }
+
+        return Image(*imageID, false);
+    } else if (optional<std::string> result = toString(value)) {
+        return Image(*result, false);
+    } else {
+        error.message = "Image must be plain string or array type.";
+        return nullopt;
+    }
+}
+
+} // namespace conversion
+} // namespace style
+} // namespace mbgl