51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
/** @file Sequence.hpp
|
|
*
|
|
* Author: Roland Conybeare
|
|
**/
|
|
|
|
#pragma once
|
|
|
|
#include "Expression.hpp"
|
|
|
|
namespace xo {
|
|
namespace scm {
|
|
class Sequence : public Expression {
|
|
public:
|
|
Sequence(const std::vector<rp<Expression>> & xv)
|
|
: Expression(exprtype::sequence,
|
|
xv[xv.size() - 1]->valuetype()),
|
|
expr_v_(xv) {}
|
|
|
|
static rp<Sequence> make(const std::vector<rp<Expression>> & xv) { return new Sequence(xv); }
|
|
|
|
std::size_t size() const { return expr_v_.size(); }
|
|
const rp<Expression> & operator[](std::size_t i) const { return expr_v_[i]; }
|
|
|
|
// ----- from Expression -----
|
|
|
|
/** note: broken if .expr_v_ contains any def-exprs
|
|
* (will treat references to so-defined vars as free).
|
|
* must rewrite these first
|
|
**/
|
|
virtual std::set<std::string> get_free_variables() const override;
|
|
virtual std::size_t visit_preorder(VisitFn visitor_fn) override;
|
|
/** note: borken if .expr_v_ contains any def-exprs **/
|
|
virtual std::size_t visit_layer(VisitFn visitor_fn) override;
|
|
virtual rp<Expression> xform_layer(TransformFn visitor_fn) override;
|
|
virtual void attach_envs(bp<Environment> parent) override;
|
|
|
|
// ----- from GeneralizedExpression ----
|
|
|
|
virtual void display(std::ostream & os) const override;
|
|
virtual std::uint32_t pretty_print(const ppindentinfo & ppii) const override;
|
|
|
|
private:
|
|
/** sequence of expressions; evaluate in left-to-right order.
|
|
**/
|
|
std::vector<rp<Expression>> expr_v_;
|
|
};
|
|
} /*namespace scm*/
|
|
|
|
} /*namespace xo*/
|
|
|
|
/** end Sequence.hpp **/
|