1 files changed, 33 insertions, 0 deletions
diff --git a/extractor/phrase_builder.h b/extractor/phrase_builder.h
new file mode 100644
index 00000000..de86dbae
--- /dev/null
+++ b/extractor/phrase_builder.h
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+#ifndef _PHRASE_BUILDER_H_
+#define _PHRASE_BUILDER_H_
+
+#include <memory>
+#include <vector>
+
+using namespace std;
+
+namespace extractor {
+
+class Phrase;
+class Vocabulary;
+
+/**
+ * Component for constructing phrases.
+ */
+class PhraseBuilder {
+ public:
+  PhraseBuilder(shared_ptr<Vocabulary> vocabulary);
+
+  // Constructs a phrase starting from an array of symbols.
+  Phrase Build(const vector<int>& symbols);
+
+  // Extends a phrase with a leading and/or trailing nonterminal.
+  Phrase Extend(const Phrase& phrase, bool start_x, bool end_x);
+
+ private:
+  shared_ptr<Vocabulary> vocabulary;
+};
+
+} // namespace extractor
+
+#endif