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diff --git a/src/sequence_matcher.hh b/src/sequence_matcher.hh
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+/**
+ * Copyright (c) 2007-2012, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef sequence_matcher_hh
+#define sequence_matcher_hh
+
+#include <list>
+#include <string>
+#include <vector>
+
+#include "byte_array.hh"
+
+class sequence_matcher {
+public:
+    typedef std::vector<std::string> field_row_t;
+    typedef std::list<field_row_t> field_col_t;
+
+    typedef byte_array<2, uint64_t> id_t;
+
+    enum field_type_t {
+        FT_VARIABLE,
+        FT_CONSTANT,
+    };
+
+    struct field {
+        field() : sf_type(FT_VARIABLE){};
+
+        field_type_t sf_type;
+        field_row_t sf_value;
+    };
+
+    sequence_matcher(field_col_t& example);
+
+    void identity(const std::vector<std::string>& values, id_t& id_out);
+
+    template<typename T>
+    bool match(const std::vector<std::string>& values,
+               std::vector<T>& state,
+               T index)
+    {
+        bool index_match = true;
+        int lpc = 0;
+
+    retry:
+        for (std::list<field>::iterator iter = this->sm_fields.begin();
+             iter != this->sm_fields.end();
+             ++iter, lpc++)
+        {
+            if (iter->sf_type != sequence_matcher::FT_CONSTANT) {
+                continue;
+            }
+
+            if (iter->sf_value[state.size()] != values[lpc]) {
+                if (!state.empty()) {
+                    state.clear();
+                    lpc = 0;
+                    goto retry;
+                } else {
+                    index_match = false;
+                    break;
+                }
+            }
+        }
+
+        if (index_match) {
+            state.push_back(index);
+        }
+
+        return (size_t) this->sm_count == state.size();
+    };
+
+private:
+    int sm_count;
+    std::list<field> sm_fields;
+};
+#endif