collator_expression.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 {
 
class CollatorExpression : public Expression {
public:
    CollatorExpression(std::unique_ptr<Expression> caseSensitive,
             std::unique_ptr<Expression> diacriticSensitive,
             std::optional<std::unique_ptr<Expression>> locale);
 
    EvaluationResult evaluate(const EvaluationContext&) const override;
    static ParseResult parse(const mbgl::style::conversion::Convertible&, ParsingContext&);
 
    void eachChild(const std::function<void(const Expression&)>&) const override;
 
    bool operator==(const Expression& e) const override;
 
    std::vector<std::optional<Value>> possibleOutputs() const override {
        // Technically the set of possible outputs is the combinatoric set of Collators produced
        // by all possibleOutputs of locale/caseSensitive/diacriticSensitive
        // But for the primary use of Collators in comparison operators, we ignore the Collator's
        // possibleOutputs anyway, so we can get away with leaving this undefined for now.
        return { std::nullopt };
    }
 
    mbgl::Value serialize() const override;
    std::string getOperator() const override { return "collator"; }
private:
    std::unique_ptr<Expression> caseSensitive;
    std::unique_ptr<Expression> diacriticSensitive;
    std::optional<std::unique_ptr<Expression>> locale;
};
 
} // namespace expression
} // namespace style
} // namespace mbgl