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#pragma once
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <mbgl/style/conversion.hpp>
#include <memory>
#include <map>
namespace mbgl {
namespace style {
namespace expression {
class Let : public Expression {
public:
using Bindings = std::map<std::string, std::shared_ptr<Expression>>;
Let(Bindings bindings_, std::unique_ptr<Expression> result_) :
Expression(result_->getType()),
bindings(std::move(bindings_)),
result(std::move(result_))
{}
static ParseResult parse(const mbgl::style::conversion::Convertible&, ParsingContext&);
EvaluationResult evaluate(const EvaluationContext& params) const override;
void eachChild(const std::function<void(const Expression&)>&) const override;
bool operator==(const Expression& e) const override {
if (auto rhs = dynamic_cast<const Let*>(&e)) {
return *result == *(rhs->result);
}
return false;
}
std::vector<optional<Value>> possibleOutputs() const override;
Expression* getResult() const {
return result.get();
}
mbgl::Value serialize() const override;
std::string getOperator() const override { return "let"; }
private:
Bindings bindings;
std::unique_ptr<Expression> result;
};
class Var : public Expression {
public:
Var(std::string name_, std::shared_ptr<Expression> value_) :
Expression(value_->getType()),
name(std::move(name_)),
value(value_)
{}
static ParseResult parse(const mbgl::style::conversion::Convertible&, ParsingContext&);
EvaluationResult evaluate(const EvaluationContext& params) const override;
void eachChild(const std::function<void(const Expression&)>&) const override;
bool operator==(const Expression& e) const override {
if (auto rhs = dynamic_cast<const Var*>(&e)) {
return *value == *(rhs->value);
}
return false;
}
std::vector<optional<Value>> possibleOutputs() const override;
mbgl::Value serialize() const override;
std::string getOperator() const override { return "var"; }
const std::shared_ptr<Expression>& getBoundExpression() const { return value; }
private:
std::string name;
std::shared_ptr<Expression> value;
};
} // namespace expression
} // namespace style
} // namespace mbgl
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