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#include <mbgl/style/conversion_impl.hpp>
#include <mbgl/style/expression/image.hpp>
#include <mbgl/style/expression/image_expression.hpp>
namespace mbgl {
namespace style {
namespace expression {
ImageExpression::ImageExpression(std::unique_ptr<Expression> imageID_)
: Expression(Kind::ImageExpression, type::Image), imageID(std::move(imageID_)) {
assert(imageID);
}
using namespace mbgl::style::conversion;
ParseResult ImageExpression::parse(const Convertible& value, ParsingContext& ctx) {
std::size_t argsLength = arrayLength(value);
if (argsLength < 2) {
ctx.error("Invalid number of arguments for 'image' expression.");
return ParseResult();
}
// Parse expression that evaluates to image id.
auto imageIDArg = arrayMember(value, 1);
ParseResult imageIDExpr = ctx.parse(imageIDArg, 1, {type::String});
if (!imageIDExpr) {
return ParseResult();
}
return ParseResult(std::make_unique<ImageExpression>(std::move(*imageIDExpr)));
}
void ImageExpression::eachChild(const std::function<void(const Expression&)>& fn) const {
fn(*imageID);
}
bool ImageExpression::operator==(const Expression& e) const {
if (e.getKind() == Kind::ImageExpression) {
auto rhs = static_cast<const ImageExpression*>(&e);
return *imageID == *rhs->imageID;
}
return false;
}
mbgl::Value ImageExpression::serialize() const {
std::vector<mbgl::Value> serialized{{getOperator()}};
serialized.push_back(imageID->serialize());
return serialized;
}
EvaluationResult ImageExpression::evaluate(const EvaluationContext& ctx) const {
auto imageIDResult = imageID->evaluate(ctx);
if (!imageIDResult) {
return imageIDResult.error();
}
optional<std::string> evaluatedImageID = toString(*imageIDResult);
if (!evaluatedImageID) {
return EvaluationError({"Could not evaluate ID for 'image' expression."});
}
bool available = ctx.availableImages && ctx.availableImages->count(*evaluatedImageID);
return Image(*evaluatedImageID, available);
}
} // namespace expression
} // namespace style
} // namespace mbgl
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