src/composer/internal/mode_switching_handler.h

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// Simple word patterns matcher which will be used in composer objects
// for auto swtiching input mode.

#ifndef MOZC_COMPOSER_INTERNAL_MODE_SWITCHING_HANDLER_H_
#define MOZC_COMPOSER_INTERNAL_MODE_SWITCHING_HANDLER_H_

#include <cctype>
#include <map>
#include <string>
#include <utility>

namespace mozc {
namespace composer {
class ModeSwitchingHandler {
 public:
  ModeSwitchingHandler();
  virtual ~ModeSwitchingHandler();

  enum ModeSwitching {
    NO_CHANGE,
    REVERT_TO_PREVIOUS_MODE,
    PREFERRED_ALPHANUMERIC,
    HALF_ALPHANUMERIC,
    FULL_ALPHANUMERIC,
  };

  // Returns true if the current preedit matches to patterns.  |key|
  // is the string which the user actually typed.  display_mode and
  // input_mode are stored rules controlling the composer.
  bool GetModeSwitchingRule(const string &key,
                            ModeSwitching *display_mode,
                            ModeSwitching *input_mode) const;

  // Matcher to Windows drive letters like "C:\".
  bool IsDriveLetter(const string &key) const;

  // Add a rule for mode switching.  |display_mode| affects the
  // existing composition the user typed.  |input_mode| affects the
  // current input mode to be used for the user's new typing.
  void AddRule(const string &key,
               const ModeSwitching display_mode,
               const ModeSwitching input_mode);

  // Reload instance variables for new config.
  void Reload();

  // Get the singleton instance of this class.
  static ModeSwitchingHandler *GetModeSwitchingHandler();

 private:
  // map<key, pair<display_mode, input_mode> >.
  map<string, pair<ModeSwitching, ModeSwitching> > patterns_;
};
}  // namespace composer
}  // namespace mozc

#endif  // MOZC_COMPOSER_INTERNAL_MODE_SWITCHING_HANDLER_H_