match.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 <memory>
 
namespace mbgl {
namespace style {
namespace expression {
 
template <typename T>
class Match : public Expression {
public:
    using Branches = std::unordered_map<T, std::shared_ptr<Expression>>;
 
    Match(const type::Type& type_,
          std::unique_ptr<Expression> input_,
          Branches branches_,
          std::unique_ptr<Expression> otherwise_)
        : Expression(Kind::Match, type_),
          input(std::move(input_)),
          branches(std::move(branches_)),
          otherwise(std::move(otherwise_)) {}
 
    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<std::optional<Value>> possibleOutputs() const override;
    
    mbgl::Value serialize() const override;
    std::string getOperator() const override { return "match"; }
private:
    std::unique_ptr<Expression> input;
    Branches branches;
    std::unique_ptr<Expression> otherwise;
};
 
ParseResult parseMatch(const mbgl::style::conversion::Convertible& value, ParsingContext& ctx);
 
} // namespace expression
} // namespace style
} // namespace mbgl