number_rewriter.h

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#ifndef MOZC_REWRITER_NUMBER_REWRITER_H_
#define MOZC_REWRITER_NUMBER_REWRITER_H_

#include <vector>

#include "absl/types/span.h"
#include "base/container/serialized_string_array.h"
#include "base/number_util.h"
#include "converter/segments.h"
#include "data_manager/data_manager_interface.h"
#include "dictionary/pos_matcher.h"
#include "request/conversion_request.h"
#include "rewriter/rewriter_interface.h"

namespace mozc {

// A rewriter to expand number styles (NumberUtil::NumberString::Style)
class NumberRewriter : public RewriterInterface {
 public:
  explicit NumberRewriter(const DataManagerInterface *data_manager);
  NumberRewriter(const NumberRewriter &) = delete;
  NumberRewriter &operator=(const NumberRewriter &) = delete;
  ~NumberRewriter() override;

  int capability(const ConversionRequest &request) const override;

  bool Rewrite(const ConversionRequest &request,
               Segments *segments) const override;

  void Finish(const ConversionRequest &request, Segments *segments) override;

 private:
  bool RewriteOneSegment(const ConversionRequest &request, Segment *segment,
                         Segments *segments) const;
  void RememberNumberStyle(const Segment::Candidate &candidate);
  std::vector<Segment::Candidate> GenerateCandidatesToInsert(
      const Segment::Candidate &arabic_candidate,
      absl::Span<const NumberUtil::NumberString> numbers,
      bool should_rerank) const;
  bool ShouldRerankCandidates(const ConversionRequest &request,
                              const Segments &segments) const;
  void RerankCandidates(std::vector<Segment::Candidate> &candidates) const;

  SerializedStringArray suffix_array_;
  const dictionary::PosMatcher pos_matcher_;
};

}  // namespace mozc

#endif  // MOZC_REWRITER_NUMBER_REWRITER_H_