step.hpp

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#pragma once
 
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <mbgl/style/conversion.hpp>
 
#include <mbgl/util/range.hpp>
 
#include <memory>
#include <map>
#include <optional>
 
namespace mbgl {
namespace style {
namespace expression {
 
class Step : public Expression {
public:
    Step(const type::Type& type_,
         std::unique_ptr<Expression> input_,
         std::map<double, std::unique_ptr<Expression>> stops_);
 
    EvaluationResult evaluate(const EvaluationContext& params) const override;
    void eachChild(const std::function<void(const Expression&)>& visit) const override;
    void eachStop(const std::function<void(double, const Expression&)>& visit) const;
 
    const std::unique_ptr<Expression>& getInput() const { return input; }
    Range<float> getCoveringStops(double lower, double upper) const;
 
    bool operator==(const Expression& e) const override;
 
    std::vector<std::optional<Value>> possibleOutputs() const override;
 
    static ParseResult parse(const mbgl::style::conversion::Convertible& value, ParsingContext& ctx);
 
    mbgl::Value serialize() const override;
    std::string getOperator() const override { return "step"; }
 
private:
    const std::unique_ptr<Expression> input;
    const std::map<double, std::unique_ptr<Expression>> stops;
};
 
} // namespace expression
} // namespace style
} // namespace mbgl