| 1 | #pragma once |
|---|---|
| 2 | |
| 3 | #include <mbgl/style/expression/expression.hpp> |
| 4 | #include <mbgl/style/conversion.hpp> |
| 5 | |
| 6 | #include <memory> |
| 7 | #include <vector> |
| 8 | |
| 9 | namespace mbgl { |
| 10 | namespace style { |
| 11 | namespace expression { |
| 12 | |
| 13 | /** |
| 14 | * Special form for error-coalescing coercion expressions "to-number", |
| 15 | * "to-color". Since these coercions can fail at runtime, they accept multiple |
| 16 | * arguments, only evaluating one at a time until one succeeds. |
| 17 | */ |
| 18 | class Coercion : public Expression { |
| 19 | public: |
| 20 | Coercion(type::Type type_, std::vector<std::unique_ptr<Expression>> inputs_); |
| 21 | |
| 22 | static ParseResult parse(const mbgl::style::conversion::Convertible& value, ParsingContext& ctx); |
| 23 | |
| 24 | EvaluationResult evaluate(const EvaluationContext& params) const override; |
| 25 | void eachChild(const std::function<void(const Expression&)>& visit) const override; |
| 26 | |
| 27 | bool operator==(const Expression& e) const override; |
| 28 | |
| 29 | std::vector<optional<Value>> possibleOutputs() const override; |
| 30 | |
| 31 | std::string getOperator() const override; |
| 32 | private: |
| 33 | EvaluationResult (*coerceSingleValue) (const Value& v); |
| 34 | std::vector<std::unique_ptr<Expression>> inputs; |
| 35 | }; |
| 36 | |
| 37 | } // namespace expression |
| 38 | } // namespace style |
| 39 | } // namespace mbgl |
| 40 | |
| 41 |