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#pragma once
#include <mbgl/style/property_expression.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/conversion/constant.hpp>
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/value.hpp>
namespace mbgl {
namespace style {
namespace conversion {
bool hasTokens(const std::string&);
std::unique_ptr<expression::Expression> convertTokenStringToExpression(const std::string&);
optional<std::unique_ptr<expression::Expression>> convertFunctionToExpression(expression::type::Type, const Convertible&, Error&, bool convertTokens);
template <class T>
optional<PropertyExpression<T>> convertFunctionToExpression(const Convertible& value, Error& error, bool convertTokens) {
auto expression = convertFunctionToExpression(expression::valueTypeToExpressionType<T>(), value, error, convertTokens);
if (!expression) {
return nullopt;
}
optional<T> defaultValue;
auto defaultValueValue = objectMember(value, "default");
if (defaultValueValue) {
defaultValue = convert<T>(*defaultValueValue, error);
if (!defaultValue) {
error.message = R"(wrong type for "default": )" + error.message;
return nullopt;
}
}
return PropertyExpression<T>(std::move(*expression), defaultValue);
}
} // namespace conversion
} // namespace style
} // namespace mbgl
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