1 files changed, 52 insertions, 0 deletions
diff --git a/extractor/phrase.h b/extractor/phrase.h
new file mode 100644
index 00000000..a8e91e3c
--- /dev/null
+++ b/extractor/phrase.h
@@ -0,0 +1,52 @@
+#ifndef _PHRASE_H_
+#define _PHRASE_H_
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "phrase_builder.h"
+
+using namespace std;
+
+namespace extractor {
+
+/**
+ * Structure containing the data for a phrase.
+ */
+class Phrase {
+ public:
+  friend Phrase PhraseBuilder::Build(const vector<int>& phrase);
+
+  // Returns the number of nonterminals in the phrase.
+  int Arity() const;
+
+  // Returns the number of terminals (length) for the given chunk. (A chunk is a
+  // contiguous sequence of terminals in the phrase).
+  int GetChunkLen(int index) const;
+
+  // Returns the symbols (word ids) marking up the phrase.
+  vector<int> Get() const;
+
+  // Returns the symbol located at the given position in the phrase.
+  int GetSymbol(int position) const;
+
+  // Returns the number of symbols in the phrase.
+  int GetNumSymbols() const;
+
+  // Returns the words making up the phrase. (Nonterminals are stripped out.)
+  vector<string> GetWords() const;
+
+  bool operator<(const Phrase& other) const;
+
+  friend ostream& operator<<(ostream& os, const Phrase& phrase);
+
+ private:
+  vector<int> symbols;
+  vector<int> var_pos;
+  vector<string> words;
+};
+
+} // namespace extractor
+
+#endif