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#ifndef _GRAMMAR_EXTRACTOR_H_
#define _GRAMMAR_EXTRACTOR_H_
#include <memory>
#include <string>
#include <vector>
#include <unordered_set>
using namespace std;
namespace extractor {
class Alignment;
class DataArray;
class Grammar;
class HieroCachingRuleFactory;
class Precomputation;
class Rule;
class Scorer;
class SuffixArray;
class Vocabulary;
/**
* Class wrapping all the logic for extracting the synchronous context free
* grammars.
*/
class GrammarExtractor {
public:
GrammarExtractor(
shared_ptr<SuffixArray> source_suffix_array,
shared_ptr<DataArray> target_data_array,
shared_ptr<Alignment> alignment,
shared_ptr<Precomputation> precomputation,
shared_ptr<Scorer> scorer,
shared_ptr<Vocabulary> vocabulary,
int min_gap_size,
int max_rule_span,
int max_nonterminals,
int max_rule_symbols,
int max_samples,
bool require_tight_phrases);
// For testing only.
GrammarExtractor(shared_ptr<Vocabulary> vocabulary,
shared_ptr<HieroCachingRuleFactory> rule_factory);
// Converts the sentence to a vector of word ids and uses the RuleFactory to
// extract the SCFG rules which may be used to decode the sentence.
Grammar GetGrammar(const string& sentence, const unordered_set<int>& blacklisted_sentence_ids, const shared_ptr<DataArray> source_data_array);
private:
// Splits the sentence in a vector of words.
vector<string> TokenizeSentence(const string& sentence);
// Maps the words to word ids.
vector<int> AnnotateWords(const vector<string>& words);
shared_ptr<Vocabulary> vocabulary;
shared_ptr<HieroCachingRuleFactory> rule_factory;
};
} // namespace extractor
#endif
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