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#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
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