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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 allowDataExpressions, bool convertTokens) const {
using namespace mbgl::style::expression;
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.message = ctx.getCombinedErrors();
return nullopt;
}
expression = PropertyExpression<T>(std::move(*parsed));
} else if (isObject(value)) {
expression = convertFunctionToExpression<T>(value, error, convertTokens);
} else {
optional<T> constant = convert<T>(value, error);
if (!constant) {
return nullopt;
}
return convertTokens ? maybeConvertTokens(*constant) : PropertyValue<T>(*constant);
}
if (!expression) {
return nullopt;
} else if (!allowDataExpressions && !(*expression).isFeatureConstant()) {
error.message = "data expressions not supported";
return nullopt;
} else if (!(*expression).isFeatureConstant() || !(*expression).isZoomConstant()) {
return { std::move(*expression) };
} else if ((*expression).getExpression().getKind() == Kind::Literal) {
optional<T> constant = fromExpressionValue<T>(
static_cast<const Literal&>((*expression).getExpression()).getValue());
if (!constant) {
return nullopt;
}
return PropertyValue<T>(*constant);
} else {
assert(false);
error.message = "expected a literal expression";
return nullopt;
}
}
template <class S>
PropertyValue<T> maybeConvertTokens(const S& t) const {
return PropertyValue<T>(t);
};
PropertyValue<T> maybeConvertTokens(const std::string& t) const {
return hasTokens(t)
? PropertyValue<T>(PropertyExpression<T>(convertTokenStringToExpression(t)))
: PropertyValue<T>(t);
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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