1 files changed, 60 insertions, 0 deletions
diff --git a/klm/search/rule.hh b/klm/search/rule.hh
new file mode 100644
index 00000000..79192d40
--- /dev/null
+++ b/klm/search/rule.hh
@@ -0,0 +1,60 @@
+#ifndef SEARCH_RULE__
+#define SEARCH_RULE__
+
+#include "lm/left.hh"
+#include "search/arity.hh"
+#include "search/types.hh"
+#include "search/word.hh"
+
+#include <boost/array.hpp>
+
+#include <iosfwd>
+#include <vector>
+
+namespace search {
+
+template <class Model> class Context;
+
+class Rule {
+  public:
+    Rule() : arity_(0) {}
+
+    void AppendTerminal(Word w) { items_.push_back(w); }
+
+    void AppendNonTerminal() {
+      items_.resize(items_.size() + 1);
+      ++arity_;
+    }
+
+    template <class Model> void FinishedAdding(const Context<Model> &context, Score additive, bool prepend_bos);
+
+    Score Bound() const { return bound_; }
+
+    Score Additive() const { return additive_; }
+
+    unsigned int Arity() const { return arity_; }
+
+    const lm::ngram::ChartState &Lexical(unsigned int index) const {
+      return lexical_[index];
+    }
+
+    // For printing.  
+    typedef const std::vector<Word> ItemsRet;
+    ItemsRet &Items() const { return items_; }
+
+  private:
+    Score bound_, additive_;
+
+    unsigned int arity_;
+
+    // TODO: pool?
+    std::vector<Word> items_;
+
+    std::vector<lm::ngram::ChartState> lexical_;
+};
+
+std::ostream &operator<<(std::ostream &o, const Rule &rule);
+
+} // namespace search
+
+#endif // SEARCH_RULE__