1 files changed, 82 insertions, 0 deletions
diff --git a/decoder/translator.h b/decoder/translator.h
new file mode 100644
index 00000000..6b0a02e4
--- /dev/null
+++ b/decoder/translator.h
@@ -0,0 +1,82 @@
+#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