compound_expression.hpp

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#pragma once
 
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <mbgl/style/expression/type.hpp>
#include <mbgl/style/expression/value.hpp>
#include <mbgl/style/conversion.hpp>
 
#include <memory>
#include <vector>
#include <optional>
 
namespace mbgl {
namespace style {
namespace expression {
 
namespace detail {
struct SignatureBase;
} // namespace detail
 
class CompoundExpression : public Expression {
public:
    CompoundExpression(const detail::SignatureBase&, std::vector<std::unique_ptr<Expression>>);
 
    std::string getOperator() const override;
    EvaluationResult evaluate(const EvaluationContext& evaluationParams) const override;
    std::vector<std::optional<Value>> possibleOutputs() const override;
    void eachChild(const std::function<void(const Expression&)>& visit) const override;
    bool operator==(const Expression& e) const override;
 
    std::optional<std::size_t> getParameterCount() const;
 
    static bool exists(const std::string& name);
 
protected:
    const detail::SignatureBase& signature;
    std::vector<std::unique_ptr<Expression>> args;
};
 
ParseResult parseCompoundExpression(const std::string& name,
                                    const mbgl::style::conversion::Convertible& value,
                                    ParsingContext& ctx);
 
ParseResult createCompoundExpression(const std::string& name,
                                     std::vector<std::unique_ptr<Expression>> args,
                                     ParsingContext& ctx);
 
} // namespace expression
} // namespace style
} // namespace mbgl