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

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

xo-reader/include/xo/reader/sequence_xs.hpp

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+/** @file sequence_xs.hpp
+ *
+ *  Author: Roland Conybeare
+ **/
+
+#pragma once
+
+#include "exprstate.hpp"
+#include <vector>
+
+namespace xo {
+    namespace ast { class Sequence; }
+    namespace ast { class Lambda; }
+
+    namespace scm {
+        class sequence_xs : public exprstate {
+        public:
+            using Sequence = xo::ast::Sequence;
+            using Lambda = xo::ast::Lambda;
+
+        public:
+            /** start parsing a sequence-expr.
+             *  input begins with first expression in the sequence.
+             **/
+            static void start(parserstatemachine * p_psm);
+
+            virtual void on_expr(ref::brw<Expression> expr,
+                                 parserstatemachine * p_psm) override;
+
+            virtual void on_rightbrace_token(const token_type & tk,
+                                             parserstatemachine * p_psm) override;
+
+        private:
+            sequence_xs();
+
+            /** named ctor idiom **/
+            static std::unique_ptr<sequence_xs> make();
+
+        private:
+            /** will build SequenceExpr from in-order contents of this vector **/
+            std::vector<rp<Expression>> expr_v_;
+        };
+    } /*namespace scm*/
+} /*namespace xo*/
+
+
+/** end sequence_xs.hpp **/