comparison.hpp

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#pragma once
 
#include <mbgl/style/expression/collator_expression.hpp>
#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 {
 
ParseResult parseComparison(const mbgl::style::conversion::Convertible&, ParsingContext&);
 
class BasicComparison : public Expression {
public:
    using CompareFunctionType = bool (*)(const Value&, const Value&);
 
    BasicComparison(
        std::string op,
        std::unique_ptr<Expression> lhs,
        std::unique_ptr<Expression> rhs);
 
    void eachChild(const std::function<void(const Expression&)>& visit) const override;
    bool operator==(const Expression&) const override;
    EvaluationResult evaluate(const EvaluationContext&) const override;
    std::vector<std::optional<Value>> possibleOutputs() const override;
    std::string getOperator() const override;
 
private:
    std::string op;
    CompareFunctionType compare;
    std::unique_ptr<Expression> lhs;
    std::unique_ptr<Expression> rhs;
    bool needsRuntimeTypeCheck;
};
 
class CollatorComparison : public Expression {
public:
    using CompareFunctionType = bool (*)(const std::string&, const std::string&, const Collator&);
 
    CollatorComparison(
        std::string op,
        std::unique_ptr<Expression> lhs,
        std::unique_ptr<Expression> rhs,
        std::unique_ptr<Expression> collator);
 
    void eachChild(const std::function<void(const Expression&)>& visit) const override;
    bool operator==(const Expression&) const override;
    EvaluationResult evaluate(const EvaluationContext&) const override;
    std::vector<std::optional<Value>> possibleOutputs() const override;
    std::string getOperator() const override;
 
private:
    std::string op;
    CompareFunctionType compare;
    std::unique_ptr<Expression> lhs;
    std::unique_ptr<Expression> rhs;
    std::unique_ptr<Expression> collator;
    bool needsRuntimeTypeCheck;
};
 
 
 
} // namespace expression
} // namespace style
} // namespace mbgl