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#ifndef MOZC_CONVERTER_SEGMENTER_INTERFACE_H_
#define MOZC_CONVERTER_SEGMENTER_INTERFACE_H_

#include "base/port.h"

namespace mozc {

struct Node;

class SegmenterInterface {
 public:
  virtual ~SegmenterInterface() {}

  // Returns true if there is a segment boundary between |lnode| and |rnode|.
  // If |is_single_segment| is true, this function basically reutrns false
  // unless |lnode| or |rnode| is BOS/EOS.  |is_single_segment| is used for
  // prediction/suggestion mode.
  virtual bool IsBoundary(const Node *lnode, const Node *rnode,
                          bool is_single_segment) const = 0;

  virtual bool IsBoundary(uint16 rid, uint16 lid) const = 0;

  // Returns cost penalty of the word prefix.  We can add cost penalty if a
  // node->lid exists at the begging of user input.
  virtual int32 GetPrefixPenalty(uint16 lid) const = 0;

  // Returns cost penalty of the word suffix.  We can add cost penalty if a
  // node->rid exists at the end of user input.
  virtual int32 GetSuffixPenalty(uint16 rid) const = 0;

 protected:
  SegmenterInterface() {}

 private:
  DISALLOW_COPY_AND_ASSIGN(SegmenterInterface);
};

}  // namespace mozc

#endif  // MOZC_CONVERTER_SEGMENTER_INTERFACE_H_