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#pragma once
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/renderer/possibly_evaluated_property_value.hpp>
namespace mbgl {
namespace style {
namespace expression {
template<class T>
class FormatSectionOverride final : public Expression {
public:
FormatSectionOverride(const type::Type& type_,
PossiblyEvaluatedPropertyValue<T> defaultValue_,
std::string propertyName_) :
Expression(Kind::FormatSectionOverride, type_),
defaultValue(std::move(defaultValue_)),
propertyName(std::move(propertyName_))
{}
EvaluationResult evaluate(const EvaluationContext& context) const final {
using Object = std::unordered_map<std::string, expression::Value>;
if (context.formattedSection &&
context.formattedSection->is<Object>()) {
const auto& section = context.formattedSection->get<Object>();
if (section.find(propertyName) != section.end()) {
return section.at(propertyName);
}
}
return defaultValue.match(
[&context] (const style::PropertyExpression<T>& e) { return e.getExpression().evaluate(context); },
[] (const T& t) -> EvaluationResult { return t; }
);
}
void eachChild(const std::function<void(const Expression&)>& fn) const final {
defaultValue.match([&fn] (const style::PropertyExpression<T>& e) { fn(e.getExpression()); },
[] (const T&) {});
}
bool operator==(const Expression& e) const final {
if (e.getKind() == Kind::FormatSectionOverride) {
const auto* other = static_cast<const FormatSectionOverride*>(&e);
if (getType() != other->getType() || propertyName != other->propertyName) {
return false;
}
// Check that default values or property expressions are equal.
return defaultValue.match(
[other] (const style::PropertyExpression<T>& thisExpr) {
return other->defaultValue.match([&thisExpr] (const style::PropertyExpression<T>& otherExpr) {
return thisExpr == otherExpr;
},
[] (const T&) {
return false;
});
},
[other] (const T& thisValue) {
return other->defaultValue.match([&thisValue] (const T& otherValue) {
return thisValue == otherValue;
},
[] (const style::PropertyExpression<T>&) {
return false;
});
});
}
return false;
}
std::vector<optional<Value>> possibleOutputs() const final {
return {nullopt};
}
std::string getOperator() const final { return "format-section-override"; }
private:
PossiblyEvaluatedPropertyValue<T> defaultValue;
std::string propertyName;
};
} // namespace expression
} // namespace style
} // namespace mbgl
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