Add 'xo-expression/' from commit '5ac3c03a0c'

git-subtree-dir: xo-expression
git-subtree-mainline: d0f5ccc1ce
git-subtree-split: 5ac3c03a0c

xo-expression/src/expression/Sequence.cpp

@@ -0,0 +1,78 @@
+/* @file Sequence.cpp */
+
+#include "Sequence.hpp"
+#include <cstddef>
+
+namespace xo {
+    namespace ast {
+        std::set<std::string>
+        Sequence::get_free_variables() const {
+            std::set<std::string> retval;
+
+            for (const auto & x : expr_v_) {
+                std::set<std::string> free_vars;
+                free_vars = x->get_free_variables();
+
+                for (const auto & y : free_vars)
+                    retval.insert(y);
+            }
+
+            return retval;
+        }
+
+        std::size_t
+        Sequence::visit_preorder(VisitFn visitor_fn) {
+            std::size_t n = 1;
+
+            visitor_fn(this);
+
+            for (const auto & x : expr_v_)
+                n += x->visit_preorder(visitor_fn);
+
+            return n;
+        }
+
+        std::size_t
+        Sequence::visit_layer(VisitFn visitor_fn) {
+            std::size_t n = 1;
+
+            visitor_fn(this);
+
+            for (const auto & x : expr_v_)
+                n += x->visit_layer(visitor_fn);
+
+            return n;
+        }
+
+        rp<Expression>
+        Sequence::xform_layer(TransformFn xform_fn) {
+            for (std::size_t i = 0, n = expr_v_.size(); i < n; ++i) {
+                expr_v_[i] = expr_v_[i]->xform_layer(xform_fn);
+            }
+
+            return xform_fn(this);
+        }
+
+        void
+        Sequence::attach_envs(ref::brw<Environment> p) {
+            for (const auto & x : expr_v_)
+                x->attach_envs(p);
+        }
+
+        void
+        Sequence::display(std::ostream & os) const {
+            os << "<Sequence";
+            std::size_t i = 0;
+            for (const auto & x : expr_v_) {
+                std::string i_str = tostr("[", i, "]");
+
+                os << xtag(i_str.c_str(), x);
+            }
+
+            os << ">";
+        }
+    } /*namespace scm*/
+} /*namespace xo*/
+
+
+/* end Sequence.cpp */