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#pragma once
#include <mbgl/style/property_value.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/conversion/constant.hpp>
#include <mbgl/style/conversion/function.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>
#include <mbgl/style/expression/literal.hpp>
namespace mbgl {
namespace style {
namespace conversion {
template <class T>
struct Converter<PropertyValue<T>> {
optional<PropertyValue<T>> operator()(const Convertible& value, Error& error, bool convertTokens = false) const {
using namespace mbgl::style::expression;
// Only icon-image and text-field support tokens, and they are both data-driven.
assert(!convertTokens);
(void)convertTokens;
if (isUndefined(value)) {
return PropertyValue<T>();
}
optional<PropertyExpression<T>> expression;
if (isExpression(value)) {
ParsingContext ctx(valueTypeToExpressionType<T>());
ParseResult parsed = ctx.parseLayerPropertyExpression(value);
if (!parsed) {
error = { ctx.getCombinedErrors() };
return {};
}
expression = PropertyExpression<T>(std::move(*parsed));
} else if (isObject(value)) {
expression = convertFunctionToExpression<T>(value, error, false);
} else {
optional<T> constant = convert<T>(value, error);
if (!constant) {
return {};
}
return { *constant };
}
if (!expression) {
return {};
} else if (!(*expression).isFeatureConstant()) {
error = { "data expressions not supported" };
return {};
} else if (!(*expression).isZoomConstant()) {
return { std::move(*expression) };
} else {
optional<T> constant = fromExpressionValue<T>(
dynamic_cast<const Literal&>((*expression).getExpression()).getValue());
if (!constant) {
return {};
}
return PropertyValue<T>(*constant);
}
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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