1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_UTIL_H_
6 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_UTIL_H_
13 #include "base/containers/hash_tables.h"
14 #include "base/memory/scoped_ptr.h"
15 #include "base/strings/string16.h"
16 #include "base/threading/thread_checker.h"
17 #include "chromeos/ime/input_method_descriptor.h"
20 namespace input_method {
22 class InputMethodDelegate;
24 enum InputMethodType {
29 // A class which provides miscellaneous input method utility functions.
30 class InputMethodUtil {
32 explicit InputMethodUtil(InputMethodDelegate* delegate);
35 // Converts a string sent from IBus IME engines, which is written in English,
36 // into Chrome's string ID, then pulls internationalized resource string from
37 // the resource bundle and returns it. These functions are not thread-safe.
38 // Non-UI threads are not allowed to call them.
39 // The english_string to should be a xkb id with "xkb:...:...:..." format.
40 // TODO(shuchen): this method should be removed when finish the wrapping of
42 base::string16 TranslateString(const std::string& english_string) const;
44 // Converts an input method ID to a language code of the IME. Returns "Eng"
45 // when |input_method_id| is unknown.
46 // Example: "hangul" => "ko"
47 std::string GetLanguageCodeFromInputMethodId(
48 const std::string& input_method_id) const;
50 // Converts an input method ID to a display name of the IME. Returns
51 // an empty strng when |input_method_id| is unknown.
52 // Examples: "pinyin" => "Pinyin"
53 std::string GetInputMethodDisplayNameFromId(
54 const std::string& input_method_id) const;
56 base::string16 GetInputMethodShortName(
57 const InputMethodDescriptor& input_method) const;
58 base::string16 GetInputMethodMediumName(
59 const InputMethodDescriptor& input_method) const;
60 base::string16 GetInputMethodLongNameStripped(
61 const InputMethodDescriptor& input_method) const;
62 base::string16 GetInputMethodLongName(
63 const InputMethodDescriptor& input_method) const;
65 // Converts an input method ID to an input method descriptor. Returns NULL
66 // when |input_method_id| is unknown.
67 // Example: "pinyin" => { id: "pinyin", display_name: "Pinyin",
68 // keyboard_layout: "us", language_code: "zh" }
69 const InputMethodDescriptor* GetInputMethodDescriptorFromId(
70 const std::string& input_method_id) const;
72 // Gets input method IDs that belong to |language_code|.
73 // If |type| is |kKeyboardLayoutsOnly|, the function does not return input
74 // methods that are not for keybord layout switching. Returns true on success.
75 // Note that the function might return false or |language_code| is unknown.
77 // The retured input method IDs are sorted by populalirty per
78 // chromeos/platform/assets/input_methods/whitelist.txt.
79 bool GetInputMethodIdsFromLanguageCode(
80 const std::string& language_code,
82 std::vector<std::string>* out_input_method_ids) const;
84 // Gets the input method IDs suitable for the first user login, based on
85 // the given language code (UI language), and the descriptor of the
86 // current input method.
87 void GetFirstLoginInputMethodIds(
88 const std::string& language_code,
89 const InputMethodDescriptor& current_input_method,
90 std::vector<std::string>* out_input_method_ids) const;
92 // Gets the language codes associated with the given input method IDs.
93 // The returned language codes won't have duplicates.
94 void GetLanguageCodesFromInputMethodIds(
95 const std::vector<std::string>& input_method_ids,
96 std::vector<std::string>* out_language_codes) const;
98 // Gets first input method associated with the language.
99 // Returns empty string on error.
100 std::string GetLanguageDefaultInputMethodId(const std::string& language_code);
102 // Migrates the legacy xkb id to extension based xkb id.
103 // Returns true if the given input method id list is modified,
104 // returns false otherwise.
105 // This method should not be removed because it's required to transfer XKB
106 // input method ID from VPD into extension-based XKB input method ID.
107 bool MigrateInputMethods(std::vector<std::string>* input_method_ids);
109 // Updates the internal cache of hardware layouts.
110 void UpdateHardwareLayoutCache();
112 // Set hardware keyboard layout for testing purpose. This is for simulating
113 // "keyboard_layout" entry in VPD values.
114 void SetHardwareKeyboardLayoutForTesting(const std::string& layout);
116 // Fills the input method IDs of the hardware keyboard. e.g. "xkb:us::eng"
117 // for US Qwerty keyboard or "xkb:ru::rus" for Russian keyboard.
118 const std::vector<std::string>& GetHardwareInputMethodIds();
120 // Returns the login-allowed input method ID of the hardware keyboard, e.g.
121 // "xkb:us::eng" but not include non-login keyboard like "xkb:ru::rus". Please
122 // note that this is not a subset of returned value of
123 // GetHardwareInputMethodIds. If GetHardwareInputMethodIds returns only
124 // non-login keyboard, this function will returns "xkb:us::eng" as the
125 // fallback keyboard.
126 const std::vector<std::string>& GetHardwareLoginInputMethodIds();
128 // Returns true if given input method can be used to input login data.
129 bool IsLoginKeyboard(const std::string& input_method_id) const;
131 // Returns true if the given input method id is supported.
132 bool IsValidInputMethodId(const std::string& input_method_id) const;
134 // Returns true if the given input method id is for a keyboard layout.
135 static bool IsKeyboardLayout(const std::string& input_method_id);
137 // Resets the list of component extension IMEs.
138 void ResetInputMethods(const InputMethodDescriptors& imes);
140 // Appends the additional list of component extension IMEs.
141 void AppendInputMethods(const InputMethodDescriptors& imes);
143 // Initializes the extension based xkb IMEs for testing.
144 void InitXkbInputMethodsForTesting();
146 // Map from input method ID to associated input method descriptor.
148 std::string, InputMethodDescriptor> InputMethodIdToDescriptorMap;
150 // Gets the id to desctiptor map for testing.
151 const InputMethodIdToDescriptorMap& GetIdToDesciptorMapForTesting();
153 // Returns the fallback input method descriptor (the very basic US
154 // keyboard). This function is mostly used for testing, but may be used
155 // as the fallback, when there is no other choice.
156 static InputMethodDescriptor GetFallbackInputMethodDescriptor();
159 // protected: for unit testing as well.
160 bool GetInputMethodIdsFromLanguageCodeInternal(
161 const std::multimap<std::string, std::string>& language_code_to_ids,
162 const std::string& normalized_language_code,
163 InputMethodType type,
164 std::vector<std::string>* out_input_method_ids) const;
166 // Gets the keyboard layout name from the given input method ID.
167 // If the ID is invalid, an empty string will be returned.
168 // This function only supports xkb layouts.
172 // "xkb:us::eng" => "us"
173 // "xkb:us:dvorak:eng" => "us(dvorak)"
174 // "xkb:gb::eng" => "gb"
175 // "pinyin" => "us" (because Pinyin uses US keyboard layout)
176 std::string GetKeyboardLayoutName(const std::string& input_method_id) const;
179 bool TranslateStringInternal(const std::string& english_string,
180 base::string16 *out_string) const;
182 // Get long name of the given input method. |short_name| is to specify whether
183 // to get the long name for OOBE screen, because OOBE screen displays shorter
184 // name (e.g. 'US' instead of 'US keyboard').
185 base::string16 GetInputMethodLongNameInternal(
186 const InputMethodDescriptor& input_method, bool short_name) const;
188 // Map from language code to associated input method IDs, etc.
189 typedef std::multimap<std::string, std::string> LanguageCodeToIdsMap;
191 LanguageCodeToIdsMap language_code_to_ids_;
192 InputMethodIdToDescriptorMap id_to_descriptor_;
194 typedef base::hash_map<std::string, int> HashType;
195 HashType english_to_resource_id_;
197 InputMethodDelegate* delegate_;
199 base::ThreadChecker thread_checker_;
200 std::vector<std::string> hardware_layouts_;
201 std::vector<std::string> hardware_login_layouts_;
202 std::vector<std::string> cached_hardware_layouts_;
204 DISALLOW_COPY_AND_ASSIGN(InputMethodUtil);
207 } // namespace input_method
208 } // namespace chromeos
210 #endif // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_UTIL_H_