62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
/* file AssignExpr.hpp
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*
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* author: Roland Conybeare, Aug 2024
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*/
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#pragma once
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#include "Expression.hpp"
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#include "Variable.hpp"
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namespace xo {
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namespace scm {
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/** @class AssignExpr
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* @brief Provide expression for assigning to a variable
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*
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* def pi = 3.14159265;
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* def foo = 0.0;
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* foo := pi / 2;
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**/
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class AssignExpr : public Expression {
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public:
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static rp<AssignExpr> make(const rp<Variable> & lhs,
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const rp<Expression> & rhs);
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static bp<AssignExpr> from(bp<Expression> x) {
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return bp<AssignExpr>::from(x);
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}
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const rp<Variable> & lhs() const { return lhs_; }
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const rp<Expression> & rhs() const { return rhs_; }
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std::set<std::string> calc_free_variables() const;
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// ----- inherited from Expression -----
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virtual std::set<std::string> get_free_variables() const override;
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virtual std::size_t visit_preorder(VisitFn visitor_fn) override;
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virtual std::size_t visit_layer(VisitFn visitor_fn) override;
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virtual rp<Expression> xform_layer(TransformFn xform_fn) override;
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virtual void attach_envs(bp<SymbolTable> p) override;
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virtual void display(std::ostream & os) const override;
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virtual std::uint32_t pretty_print(const ppindentinfo & ppii) const override;
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private:
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AssignExpr(const rp<Variable> & lhs,
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const rp<Expression> & rhs);
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private:
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/** assign to this variable. **/
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rp<Variable> lhs_;
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/** assign value of this expression to variable @p lhs **/
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rp<Expression> rhs_;
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/** free variables for this assignment **/
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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 AssignExpr.hpp */
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