75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/** @file DDefineExpr.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 "DVariable.hpp"
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#include <xo/alloc2/Allocator.hpp>
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namespace xo {
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namespace scm {
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class DUniqueString; // see DUniqueString.hpp
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/** @class DDefineExpr
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* @brief an expression that introduces a variable.
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*
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* Variable may optionally be declared with a type,
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* and may come with an expression specifying an initial value
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**/
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class DDefineExpr {
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public:
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using AAllocator = xo::mm::AAllocator;
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using TypeDescr = xo::reflect::TypeDescr;
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public:
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/** create instance: define-expr using memory from @p mm
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* with lhs name @p lhs_name and rhs expression @p rhs_expr
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**/
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static DDefineExpr * make(obj<AAllocator> mm,
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const DUniqueString * lhs_name,
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obj<AExpression> rhs_expr);
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/** create empty skeleton. Rely on this for parsing
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**/
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static DDefineExpr * make_empty(obj<AAllocator> mm);
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DVariable * lhs() const { return lhs_var_; }
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obj<AExpression> rhs() const noexcept { return rhs_; }
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const DUniqueString * name() const noexcept;
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void assign_lhs_name(const DUniqueString * name);
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/** CONCESSION. will use DUniqueString* once we have StringTable **/
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void assign_lhs_name(std::string_view name);
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/** @defgroup scm-defineexpr-expression-facet **/
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///@{
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exprtype extype() const noexcept { return exprtype::define; }
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TypeRef typeref() const noexcept { return lhs_var_->typeref(); }
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TypeDescr valuetype() const noexcept { return lhs_var_->typeref().td(); }
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void assign_valuetype(TypeDescr td) noexcept;
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///@}
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private:
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DDefineExpr(DVariable * lhs_var,
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obj<AExpression> rhs);
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private:
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/** variable being defined by this expression.
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**/
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DVariable * lhs_var_ = nullptr;
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/** expression for initial value of this expression
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**/
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obj<AExpression> rhs_;
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// std::set<std::string> free_var_set_;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/* end DDefineExpr.hpp */
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