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+#ifndef _TRANSLATOR_H_
+#define _TRANSLATOR_H_
+
+#include <string>
+#include <vector>
+#include <map>
+#include <boost/shared_ptr.hpp>
+#include <boost/program_options/variables_map.hpp>
+
+class Hypergraph;
+class SentenceMetadata;
+
+// Workflow: for each sentence to be translated
+// 1) call ProcessMarkupHints(markup)
+// 2) call Translate(...)
+// 3) call SentenceComplete()
+class Translator {
+ public:
+ Translator() : state_(kUninitialized) {}
+ virtual ~Translator();
+ // returns true if goal reached, false otherwise
+ // minus_lm_forest will contain the unpruned forest. the
+ // feature values from the phrase table / grammar / etc
+ // should be in the forest already - the "late" features
+ // should not just copy values that are available without
+ // any context or computation.
+ // SentenceMetadata contains information about the sentence,
+ // but it is an input/output parameter since the Translator
+ // is also responsible for setting the value of src_len.
+ bool Translate(const std::string& src,
+ SentenceMetadata* smeta,
+ const std::vector<double>& weights,
+ Hypergraph* minus_lm_forest);
+
+ // This is called before Translate(...) with the sentence-
+ // level markup passed in. This can be used to set sentence-
+ // specific behavior of the translator.
+ void ProcessMarkupHints(const std::map<std::string, std::string>& kv);
+
+ // Free any sentence-specific resources
+ void SentenceComplete();
+ protected:
+ virtual bool TranslateImpl(const std::string& src,
+ SentenceMetadata* smeta,
+ const std::vector<double>& weights,
+ Hypergraph* minus_lm_forest) = 0;
+ virtual void ProcessMarkupHintsImpl(const std::map<std::string, std::string>& kv);
+ virtual void SentenceCompleteImpl();
+ private:
+ enum State { kUninitialized, kReadyToTranslate, kTranslated };
+ State state_;
+};
+
+class SCFGTranslatorImpl;
+class SCFGTranslator : public Translator {
+ public:
+ SCFGTranslator(const boost::program_options::variables_map& conf);
+ protected:
+ bool TranslateImpl(const std::string& src,
+ SentenceMetadata* smeta,
+ const std::vector<double>& weights,
+ Hypergraph* minus_lm_forest);
+ void ProcessMarkupHintsImpl(const std::map<std::string, std::string>& kv);
+ void SentenceCompleteImpl();
+ private:
+ boost::shared_ptr<SCFGTranslatorImpl> pimpl_;
+};
+
+class FSTTranslatorImpl;
+class FSTTranslator : public Translator {
+ public:
+ FSTTranslator(const boost::program_options::variables_map& conf);
+ private:
+ bool TranslateImpl(const std::string& src,
+ SentenceMetadata* smeta,
+ const std::vector<double>& weights,
+ Hypergraph* minus_lm_forest);
+ private:
+ boost::shared_ptr<FSTTranslatorImpl> pimpl_;
+};
+
+#endif