35 lines
1.0 KiB
C++
35 lines
1.0 KiB
C++
#pragma once
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#include <mbgl/style/expression/expression.hpp>
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#include <mbgl/style/conversion.hpp>
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#include <memory>
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#include <vector>
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namespace mbgl {
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namespace style {
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namespace expression {
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/**
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* Special form for error-coalescing coercion expressions "to-number",
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* "to-color". Since these coercions can fail at runtime, they accept multiple
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* arguments, only evaluating one at a time until one succeeds.
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*/
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class Coercion : public Expression {
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public:
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Coercion(type::Type type_, std::vector<std::unique_ptr<Expression>> inputs_);
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static ParseResult parse(const mbgl::style::conversion::Convertible& value, ParsingContext& ctx);
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EvaluationResult evaluate(const EvaluationContext& params) const override;
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void eachChild(const std::function<void(const Expression&)>& visit) const override;
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bool operator==(const Expression& e) const override;
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private:
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EvaluationResult (*coerceSingleValue) (const Value& v);
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std::vector<std::unique_ptr<Expression>> inputs;
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};
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} // namespace expression
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} // namespace style
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} // namespace mbgl
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