composer/internal/mode_switching_handler.h - mozc (d2e045e)

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// Copyright 2010-2012, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// 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_
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