literal.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 Literal : public Expression {
public:
    Literal(const Value& value_) : Expression(Kind::Literal, typeOf(value_)), value(value_) {}
 
    Literal(const type::Array& type_, std::vector<Value> value_)
        : Expression(Kind::Literal, type_), value(std::move(value_)) {}
 
    EvaluationResult evaluate(const EvaluationContext&) const override {
        return value;
    }
    
    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 {
        if (e.getKind() == Kind::Literal) {
            auto rhs = static_cast<const Literal*>(&e);
            return value == rhs->value;
        }
        return false;
    }
 
    std::vector<std::optional<Value>> possibleOutputs() const override {
        return {{ value }};
    }
    
    Value getValue() const {
        return value;
    }
 
    mbgl::Value serialize() const override;
    std::string getOperator() const override { return "literal"; }
 
private:
    Value value;
};
 
} // namespace expression
} // namespace style
} // namespace mbgl