text: // Copyright 2010-2020, Google Inc.
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  #ifndef MOZC_REWRITER_SYMBOL_REWRITER_H_
  #define MOZC_REWRITER_SYMBOL_REWRITER_H_
  
  #include <memory>
  #include <string>
  
  #include "data_manager/serialized_dictionary.h"
  #include "rewriter/rewriter_interface.h"
  // for FRIEND_TEST()
  #include "testing/base/public/gunit_prod.h"
  #include "absl/strings/string_view.h"
  
  namespace mozc {
  
  class ConversionRequest;
  class ConverterInterface;
  class DataManagerInterface;
  class Segment;
  class Segments;
  
  class SymbolRewriter : public RewriterInterface {
   public:
    explicit SymbolRewriter(const ConverterInterface *parent_converter,
                            const DataManagerInterface *data_manager);
    ~SymbolRewriter() override;
  
    int capability(const ConversionRequest &request) const override;
  
    bool Rewrite(const ConversionRequest &request,
                 Segments *segments) const override;
  
   private:
    FRIEND_TEST(SymbolRewriterTest, TriggerRewriteEntireTest);
    FRIEND_TEST(SymbolRewriterTest, TriggerRewriteEachTest);
    FRIEND_TEST(SymbolRewriterTest, TriggerRewriteDescriptionTest);
    FRIEND_TEST(SymbolRewriterTest, SplitDescriptionTest);
  
    // Some characters may have different description for full/half width forms.
    // Here we just change the description in this function.
    static const std::string GetDescription(
        const std::string &value, absl::string_view description,
        absl::string_view additional_description);
  
    // return true key has no-hiragana
    static bool IsSymbol(const std::string &key);
  
    // Insert alternative form of space.
    static void ExpandSpace(Segment *segment);
  
    // Returns true if the symbol is platform dependent
    static bool IsPlatformDependent(SerializedDictionary::const_iterator iter);
  
    // Return true if two symbols are in same group.
    static bool InSameSymbolGroup(SerializedDictionary::const_iterator lhs,
                                  SerializedDictionary::const_iterator rhs);
  
    // Insert Symbol into segment.
    static void InsertCandidates(size_t default_offset,
                                 const SerializedDictionary::IterRange &range,
                                 bool context_sensitive, Segment *segment);
  
    // Add symbol desc to exsisting candidates
    static void AddDescForCurrentCandidates(
        const SerializedDictionary::IterRange &range, Segment *segment);
  
    static size_t GetOffset(const ConversionRequest &request,
                            absl::string_view key);
  
    // Insert symbols using connected all segments.
    bool RewriteEntireCandidate(const ConversionRequest &request,
                                Segments *segments) const;
  
    // Insert symbols using single segment.
    bool RewriteEachCandidate(const ConversionRequest &request,
                              Segments *segments) const;
  
    const ConverterInterface *parent_converter_;
    std::unique_ptr<SerializedDictionary> dictionary_;
  };
  
  }  // namespace mozc
  
  #endif  // MOZC_REWRITER_SYMBOL_REWRITER_H_
  