Add commit 43aab01 of BenHanson/lexertl14 from github

YACReaderLibrary/lexertl/internals.hpp

@@ -0,0 +1,75 @@
+// internals.hpp
+// Copyright (c) 2009-2018 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_INTERNALS_HPP
+#define LEXERTL_INTERNALS_HPP
+
+#include "enums.hpp"
+#include <memory>
+#include <vector>
+
+namespace lexertl
+{
+namespace detail
+{
+template<typename id_type>
+struct basic_internals
+{
+    using id_type_vector = std::vector<id_type>;
+    using id_type_vector_vector = std::vector<id_type_vector>;
+
+    id_type _eoi;
+    id_type_vector_vector _lookup;
+    id_type_vector _dfa_alphabet;
+    id_type _features;
+    id_type_vector_vector _dfa;
+
+    basic_internals() :
+        _eoi(0),
+        _lookup(),
+        _dfa_alphabet(),
+        _features(0),
+        _dfa()
+    {
+    }
+
+    void clear()
+    {
+        _eoi = 0;
+        _lookup.clear();
+        _dfa_alphabet.clear();
+        _features = 0;
+        _dfa.clear();
+    }
+
+    bool empty() const
+    {
+        return _dfa.empty();
+    }
+
+    void add_states(const std::size_t num_)
+    {
+        for (std::size_t index_ = 0; index_ < num_; ++index_)
+        {
+            // lookup *always* has a size 256 now.
+            _lookup.push_back(id_type_vector(256, dead_state_index));
+            _dfa_alphabet.push_back(0);
+            _dfa.push_back(id_type_vector());
+        }
+    }
+
+    void swap(basic_internals &internals_)
+    {
+        std::swap(_eoi, internals_._eoi);
+        _lookup.swap(internals_._lookup);
+        _dfa_alphabet.swap(internals_._dfa_alphabet);
+        std::swap(_features, internals_._features);
+        _dfa.swap(internals_._dfa);
+    }
+};
+}
+}
+
+#endif