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#pragma once
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <memory>
#include <map>
namespace mbgl {
namespace style {
namespace expression {
class Coalesce : public Expression {
public:
using Args = std::vector<std::unique_ptr<Expression>>;
Coalesce(const type::Type& type_, Args args_) :
Expression(Kind::Coalesce, type_),
args(std::move(args_))
{}
static ParseResult parse(const mbgl::style::conversion::Convertible& value, ParsingContext& ctx);
EvaluationResult evaluate(const EvaluationContext& params) const override;
void eachChild(const std::function<void(const Expression&)>& visit) const override;
bool operator==(const Expression& e) const override;
std::vector<optional<Value>> possibleOutputs() const override;
std::size_t getLength() const {
return args.size();
}
Expression* getChild(std::size_t i) const {
return args.at(i).get();
}
std::string getOperator() const override { return "coalesce"; }
private:
Args args;
};
} // namespace expression
} // namespace style
} // namespace mbgl
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