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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>
#include "grammar.h"
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();
virtual std::string GetDecoderType() const;
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);
void SetSupplementalGrammar(const std::string& grammar);
void SetSentenceGrammarFromString(const std::string& grammar);
virtual std::string GetDecoderType() const;
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
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