1 #pragma once
2 
3 #include <mbgl/style/expression/expression.hpp>
4 #include <mbgl/style/expression/parsing_context.hpp>
5 #include <mbgl/style/conversion.hpp>
6 
7 #include <memory>
8 
9 namespace mbgl {
10 namespace style {
11 namespace expression {
12 
13 class CollatorExpression : public Expression {
14 public:
15     CollatorExpression(std::unique_ptr<Expression> caseSensitive,
16              std::unique_ptr<Expression> diacriticSensitive,
17              optional<std::unique_ptr<Expression>> locale);
18 
19     EvaluationResult evaluate(const EvaluationContext&) const override;
20     static ParseResult parse(const mbgl::style::conversion::Convertible&, ParsingContext&);
21 
22     void eachChild(const std::function<void(const Expression&)>&) const override;
23 
24     bool operator==(const Expression& e) const override;
25 
possibleOutputs() const26     std::vector<optional<Value>> possibleOutputs() const override {
27         // Technically the set of possible outputs is the combinatoric set of Collators produced
28         // by all possibleOutputs of locale/caseSensitive/diacriticSensitive
29         // But for the primary use of Collators in comparison operators, we ignore the Collator's
30         // possibleOutputs anyway, so we can get away with leaving this undefined for now.
31         return { nullopt };
32     }
33 
34     mbgl::Value serialize() const override;
getOperator() const35     std::string getOperator() const override { return "collator"; }
36 private:
37     std::unique_ptr<Expression> caseSensitive;
38     std::unique_ptr<Expression> diacriticSensitive;
39     optional<std::unique_ptr<Expression>> locale;
40 };
41 
42 } // namespace expression
43 } // namespace style
44 } // namespace mbgl
45