Add 'xo-reader/' from commit 'c46c0f1cc4'

git-subtree-dir: xo-reader
git-subtree-mainline: dacdeb2cd7
git-subtree-split: c46c0f1cc4

xo-reader/include/xo/reader/envframe.hpp

@@ -0,0 +1,48 @@
+/* file envframe.hpp
+ *
+ * author: Roland Conybeare, Aug 2024
+ */
+
+#pragma once
+
+#include "xo/expression/Variable.hpp"
+#include <vector>
+
+namespace xo {
+    namespace scm {
+        /** @class envframe
+         *  @brief names/types of formal paremeters introduced by a function
+         *
+         *
+         **/
+        class envframe {
+        public:
+            using Variable = xo::ast::Variable;
+
+        public:
+            envframe() = default;
+            envframe(const std::vector<rp<Variable>> & argl) : argl_(argl) {}
+
+            const std::vector<rp<Variable>> & argl() const { return argl_; }
+
+            /** lookup variable by name.  If found, return it.
+             *  Otherwise return nullptr
+             **/
+            rp<Variable> lookup(const std::string & name) const;
+
+            void print (std::ostream & os) const;
+
+        private:
+            std::vector<rp<Variable>> argl_;
+        };
+
+        inline std::ostream &
+        operator<< (std::ostream & os, const envframe & x) {
+            x.print(os);
+            return os;
+        }
+    } /*namespace scm*/
+} /*namespace xo*/
+
+
+/* end envframe.hpp */