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diff --git a/extractor/grammar_extractor.h b/extractor/grammar_extractor.h
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+++ b/extractor/grammar_extractor.h
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+#ifndef _GRAMMAR_EXTRACTOR_H_
+#define _GRAMMAR_EXTRACTOR_H_
+
+#include <string>
+#include <vector>
+
+#include "rule_factory.h"
+
+using namespace std;
+
+class Alignment;
+class DataArray;
+class Grammar;
+class Precomputation;
+class Rule;
+class SuffixArray;
+class Vocabulary;
+
+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,
+      int min_gap_size,
+      int max_rule_span,
+      int max_nonterminals,
+      int max_rule_symbols,
+      int max_samples,
+      bool use_fast_intersect,
+      bool use_baeza_yates,
+      bool require_tight_phrases);
+
+  // For testing only.
+  GrammarExtractor(shared_ptr<Vocabulary> vocabulary,
+                   shared_ptr<HieroCachingRuleFactory> rule_factory);
+
+  Grammar GetGrammar(const string& sentence);
+
+ private:
+  vector<string> TokenizeSentence(const string& sentence);
+
+  vector<int> AnnotateWords(const vector<string>& words);
+
+  shared_ptr<Vocabulary> vocabulary;
+  shared_ptr<HieroCachingRuleFactory> rule_factory;
+};
+
+#endif