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#include <mbgl/style/conversion/color_ramp_property_value.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/conversion/constant.hpp>
#include <mbgl/style/expression/value.hpp>
#include <mbgl/style/expression/is_constant.hpp>
#include <mbgl/style/expression/is_expression.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
namespace mbgl {
namespace style {
namespace conversion {
optional<ColorRampPropertyValue> Converter<ColorRampPropertyValue>::operator()(const Convertible& value, Error& error, bool, bool) const {
using namespace mbgl::style::expression;
if (isUndefined(value)) {
return ColorRampPropertyValue();
} else if (isExpression(value)) {
ParsingContext ctx(type::Color);
ParseResult expression = ctx.parseLayerPropertyExpression(value);
if (!expression) {
error.message = ctx.getCombinedErrors();
return nullopt;
}
assert(*expression);
if (!isFeatureConstant(**expression)) {
error.message = "data expressions not supported";
return nullopt;
}
if (!isZoomConstant(**expression)) {
error.message = "zoom expressions not supported";
return nullopt;
}
return ColorRampPropertyValue(std::move(*expression));
} else {
error.message = "color ramp must be an expression";
return nullopt;
}
}
} // namespace conversion
} // namespace style
} // namespace mbgl
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