Add commit 43aab01 of BenHanson/lexertl14 from github

YACReaderLibrary/lexertl/parser/tree/leaf_node.hpp

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+// leaf_node.hpp
+// Copyright (c) 2005-2018 Ben Hanson (http://www.benhanson.net/)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file licence_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef LEXERTL_LEAF_NODE_HPP
+#define LEXERTL_LEAF_NODE_HPP
+
+#include "../../enums.hpp" // null_token
+#include "node.hpp"
+
+namespace lexertl
+{
+namespace detail
+{
+template<typename id_type>
+class basic_leaf_node : public basic_node<id_type>
+{
+public:
+    using node = basic_node<id_type>;
+    using bool_stack = typename node::bool_stack;
+    using const_node_stack = typename node::const_node_stack;
+    using node_ptr_vector = typename node::node_ptr_vector;
+    using node_stack = typename node::node_stack;
+    using node_type = typename node::node_type;
+    using node_vector = typename node::node_vector;
+
+    basic_leaf_node(const id_type token_, const bool greedy_) :
+        node(token_ == node::null_token()),
+        _token(token_),
+        _set_greedy(!greedy_),
+        _greedy(greedy_),
+        _followpos()
+    {
+        if (!node::_nullable)
+        {
+            node::_firstpos.push_back(this);
+            node::_lastpos.push_back(this);
+        }
+    }
+
+    virtual ~basic_leaf_node() override
+    {
+    }
+
+    virtual void append_followpos(const node_vector &followpos_) override
+    {
+        _followpos.insert(_followpos.end(),
+            followpos_.begin(), followpos_.end());
+    }
+
+    virtual node_type what_type() const override
+    {
+        return node::LEAF;
+    }
+
+    virtual bool traverse(const_node_stack &/*node_stack_*/,
+        bool_stack &/*perform_op_stack_*/) const override
+    {
+        return false;
+    }
+
+    virtual id_type token() const override
+    {
+        return _token;
+    }
+
+    virtual void greedy(const bool greedy_) override
+    {
+        if (!_set_greedy)
+        {
+            _greedy = greedy_;
+            _set_greedy = true;
+        }
+    }
+
+    virtual bool greedy() const override
+    {
+        return _greedy;
+    }
+
+    virtual const node_vector &followpos() const override
+    {
+        return _followpos;
+    }
+
+    virtual node_vector &followpos() override
+    {
+        return _followpos;
+    }
+
+private:
+    id_type _token;
+    bool _set_greedy;
+    bool _greedy;
+    node_vector _followpos;
+
+    virtual void copy_node(node_ptr_vector &node_ptr_vector_,
+        node_stack &new_node_stack_, bool_stack &/*perform_op_stack_*/,
+        bool &/*down_*/) const override
+    {
+        node_ptr_vector_.emplace_back(std::make_unique<basic_leaf_node>
+            (_token, _greedy));
+        new_node_stack_.push(node_ptr_vector_.back().get());
+    }
+};
+}
+}
+
+#endif