format_expression.hpp

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#pragma once
 
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
 
namespace mbgl {
namespace style {
namespace expression {
 
struct FormatExpressionSection {
    explicit FormatExpressionSection(std::unique_ptr<Expression> content_);
 
    void setTextSectionOptions(std::optional<std::unique_ptr<Expression>> fontScale_,
                               std::optional<std::unique_ptr<Expression>> textFont_,
                               std::optional<std::unique_ptr<Expression>> textColor_);
 
    // Content can be expression that evaluates to String or Image.
    std::shared_ptr<Expression> content;
 
    // Text related section options.
    std::optional<std::shared_ptr<Expression>> fontScale;
    std::optional<std::shared_ptr<Expression>> textFont;
    std::optional<std::shared_ptr<Expression>> textColor;
};
    
class FormatExpression final : public Expression {
public:
    explicit FormatExpression(std::vector<FormatExpressionSection> sections);
    
    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 combinatoric set of all children
        // Usually, this.text will be undefined anyway
        return { std::nullopt };
    }
    
    const std::vector<FormatExpressionSection>& getSections() const { return sections; }
 
    mbgl::Value serialize() const override;
    std::string getOperator() const override { return "format"; }
private:
    std::vector<FormatExpressionSection> sections;
};
    
} // namespace expression
} // namespace style
} // namespace mbgl