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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
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