Roland Conybeare
aecabbb144
git-subtree-dir: xo-expression git-subtree-mainline:d0f5ccc1cegit-subtree-split:5ac3c03a0c
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
/** @file GeneralizedExpression.hpp
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*
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* Author: Roland Conybeare
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**/
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#pragma once
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#include "xo/refcnt/Refcounted.hpp"
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#include "xo/reflect/TypeDescr.hpp"
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#include "exprtype.hpp"
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//#include <cstdint>
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namespace xo {
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namespace ast {
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/** @class GeneralizedExpression
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* @brief abstract syntax tree (non-executable) for schematica
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*
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* 'Generalized' because it includes both kernel and macro expressions.
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* Every macro expression automatically translates to an equivalent kernel expression.
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* Kernel expressions are directly executable.
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**/
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class GeneralizedExpression : public ref::Refcount {
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public:
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using TypeDescr = xo::reflect::TypeDescr;
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public:
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GeneralizedExpression(exprtype extype, TypeDescr valuetype)
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: extype_{extype}, valuetype_{valuetype}{}
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exprtype extype() const { return extype_; }
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TypeDescr valuetype() const { return valuetype_; }
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/** write human-readable representation to stream **/
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virtual void display(std::ostream & os) const = 0;
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/** human-readable string representation **/
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virtual std::string display_string() const;
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protected:
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/** useful when scaffolding expressions in a parser **/
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void assign_valuetype(TypeDescr x) { valuetype_ = x; }
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private:
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/** expression type (constant | apply | ..) for this expression **/
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exprtype extype_ = exprtype::invalid;
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/** type information (when available) for values produced by this
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* expression.
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**/
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TypeDescr valuetype_ = nullptr;
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};
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inline std::ostream &
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operator<<(std::ostream & os, const GeneralizedExpression & x) {
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x.display(os);
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return os;
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}
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} /*namespace ast*/
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} /*namespace xo*/
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/** end GeneralizedExpression.hpp **/
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