92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/** @file DSequenceExpr.hpp
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*
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* @author Roland Conybeare, Jan 2026
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**/
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#pragma once
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#include "Expression.hpp"
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#include "TypeRef.hpp"
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#include <xo/object2/DArray.hpp>
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namespace xo {
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namespace scm {
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/** syntax for a sequence of expressions
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* {
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* expr(1);
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* expr(2);
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* ...
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* expr(n);
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* }
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**/
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class DSequenceExpr {
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public:
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using ACollector = xo::mm::ACollector;
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using AAllocator = xo::mm::AAllocator;
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using TypeDescr = xo::reflect::TypeDescr;
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using size_type = DArray::size_type;
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using ppindentinfo = xo::print::ppindentinfo;
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public:
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DSequenceExpr() ;
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DSequenceExpr(DArray * xv);
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/** create empty sequence using memory from @p mm **/
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static obj<AExpression,DSequenceExpr> make_empty(obj<AAllocator> mm);
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/** create empty sequence expression using mmeory from @p mm **/
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static DSequenceExpr * _make_empty(obj<AAllocator> mm);
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size_type size() const noexcept;
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obj<AExpression> operator[](std::size_t i) const;
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/** append @p expr to the end of this sequence;
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* use memory from @p mm if need to expand storage
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**/
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void push_back(obj<AAllocator> mm,
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obj<AExpression> expr);
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// get_free_variables();
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// visit_preorder();
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// visit_layer();
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// xform_layer()
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// attach_envs()
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/** @defgroup scm-ifelseexpr-expression-facets **/
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///@{
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exprtype extype() const noexcept { return exprtype::sequence; }
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TypeRef typeref() const noexcept { return typeref_; }
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TypeDescr valuetype() const noexcept { return typeref_.td(); }
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void assign_valuetype(TypeDescr td) noexcept;
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///@}
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/** @defgroup scm-sequenceexpr-printable-facet printable facet methods **/
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///@{
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/** pretty-printing driver; combine layout+printing **/
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bool pretty(const ppindentinfo & ppii) const;
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///@}
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/** @defgroup scm-sequenceexpr-gcobject-facet gcobject facet methods **/
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///@{
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std::size_t shallow_size() const noexcept;
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DSequenceExpr * shallow_move(obj<AAllocator> mm) const noexcept;
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std::size_t forward_children(obj<ACollector> gc) noexcept;
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///@}
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private:
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/** expression value always has type consistent with this description
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**/
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TypeRef typeref_;
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/** array of expressions **/
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DArray * expr_v_ = nullptr;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/* end DSequenceExpr.hpp */
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