Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/keycodes/keyboard_code_conversion.cc

Index: ui/events/keycodes/keyboard_code_conversion.cc
diff --git a/ui/events/keycodes/keyboard_code_conversion.cc b/ui/events/keycodes/keyboard_code_conversion.cc
index e7b067c5c9f75470a7bd654d3cabd586c3d5868a..7494ffa93db79418411021c030430686a0b43460 100644
--- a/ui/events/keycodes/keyboard_code_conversion.cc
+++ b/ui/events/keycodes/keyboard_code_conversion.cc
@@ -4,114 +4,551 @@
 
 #include "ui/events/keycodes/keyboard_code_conversion.h"
 
+#include <algorithm>
+
 #include "ui/events/event_constants.h"
+#include "ui/events/keycodes/dom/dom_code.h"
+#include "ui/events/keycodes/dom/dom_key.h"
+#include "ui/events/keycodes/dom_us_layout_data.h"
 
 namespace ui {
 
-uint16 GetCharacterFromKeyCode(KeyboardCode key_code, int flags) {
+namespace {
+
+// This table maps a subset of |KeyboardCode| (VKEYs) to DomKey and character.
+// Only values not otherwise handled by GetMeaningFromKeyCode() are here.
+const struct KeyboardCodeToMeaning {
+  KeyboardCode key_code;
+  DomKey key;
+  base::char16 plain_character;
+  base::char16 shift_character;
+} kKeyboardCodeToMeaning[] = {
+    {VKEY_BACK, DomKey::BACKSPACE, '\b', 0},
+    {VKEY_TAB, DomKey::TAB, '\t', 0},
+    {VKEY_RETURN, DomKey::ENTER, '\r', 0},
+    {VKEY_ESCAPE, DomKey::ESCAPE, 0x1B, 0},
+    {VKEY_SPACE, DomKey::CHARACTER, ' ', 0},
+    {VKEY_MULTIPLY, DomKey::CHARACTER, '*', 0},
+    {VKEY_ADD, DomKey::CHARACTER, '+', 0},
+    {VKEY_SEPARATOR, DomKey::CHARACTER, ',', 0},
+    {VKEY_SUBTRACT, DomKey::CHARACTER, '-', 0},
+    {VKEY_DECIMAL, DomKey::CHARACTER, '.', 0},
+    {VKEY_DIVIDE, DomKey::CHARACTER, '/', 0},
+    {VKEY_OEM_1, DomKey::CHARACTER, ';', ':'},
+    {VKEY_OEM_PLUS, DomKey::CHARACTER, '=', '+'},
+    {VKEY_OEM_COMMA, DomKey::CHARACTER, ',', '<'},
+    {VKEY_OEM_MINUS, DomKey::CHARACTER, '-', '_'},
+    {VKEY_OEM_PERIOD, DomKey::CHARACTER, '.', '>'},
+    {VKEY_OEM_2, DomKey::CHARACTER, '/', '?'},
+    {VKEY_OEM_3, DomKey::CHARACTER, '`', '~'},
+    {VKEY_OEM_4, DomKey::CHARACTER, '[', '{'},
+    {VKEY_OEM_5, DomKey::CHARACTER, '\\', '|'},
+    {VKEY_OEM_6, DomKey::CHARACTER, ']', '}'},
+    {VKEY_OEM_7, DomKey::CHARACTER, '\'', '"'},
+    {VKEY_OEM_102, DomKey::CHARACTER, '<', '>'},
+    {VKEY_CLEAR, DomKey::CLEAR, 0, 0},
+    {VKEY_SHIFT, DomKey::SHIFT, 0, 0},
+    {VKEY_CONTROL, DomKey::CONTROL, 0, 0},
+    {VKEY_MENU, DomKey::ALT, 0, 0},
+    {VKEY_PAUSE, DomKey::PAUSE, 0, 0},
+    {VKEY_CAPITAL, DomKey::CAPS_LOCK, 0, 0},
+    // Windows conflates 'KanaMode' and 'HangulMode'.
+    {VKEY_KANA, DomKey::KANA_MODE, 0, 0},
+    {VKEY_JUNJA, DomKey::JUNJA_MODE, 0, 0},
+    {VKEY_FINAL, DomKey::FINAL_MODE, 0, 0},
+    // Windows conflates 'HanjaMode' and 'KanjiMode'.
+    {VKEY_HANJA, DomKey::HANJA_MODE, 0, 0},
+    {VKEY_CONVERT, DomKey::CONVERT, 0, 0},
+    {VKEY_NONCONVERT, DomKey::NON_CONVERT, 0, 0},
+    {VKEY_ACCEPT, DomKey::ACCEPT, 0, 0},
+    {VKEY_MODECHANGE, DomKey::MODE_CHANGE, 0, 0},
+    {VKEY_PRIOR, DomKey::PAGE_UP, 0, 0},
+    {VKEY_NEXT, DomKey::PAGE_DOWN, 0, 0},
+    {VKEY_END, DomKey::END, 0, 0},
+    {VKEY_HOME, DomKey::HOME, 0, 0},
+    {VKEY_LEFT, DomKey::ARROW_LEFT, 0, 0},
+    {VKEY_UP, DomKey::ARROW_UP, 0, 0},
+    {VKEY_RIGHT, DomKey::ARROW_RIGHT, 0, 0},
+    {VKEY_DOWN, DomKey::ARROW_DOWN, 0, 0},
+    {VKEY_SELECT, DomKey::SELECT, 0, 0},
+    {VKEY_PRINT, DomKey::PRINT, 0, 0},
+    {VKEY_EXECUTE, DomKey::EXECUTE, 0, 0},
+    {VKEY_SNAPSHOT, DomKey::PRINT_SCREEN, 0, 0},
+    {VKEY_INSERT, DomKey::INSERT, 0, 0},
+    {VKEY_DELETE, DomKey::DEL, 0, 0},
+    {VKEY_HELP, DomKey::HELP, 0, 0},
+    {VKEY_LWIN, DomKey::OS, 0, 0},
+    {VKEY_RWIN, DomKey::OS, 0, 0},
+    {VKEY_APPS, DomKey::MEDIA_APPS, 0, 0},
+    {VKEY_NUMLOCK, DomKey::NUM_LOCK, 0, 0},
+    {VKEY_SCROLL, DomKey::SCROLL_LOCK, 0, 0},
+    {VKEY_LSHIFT, DomKey::SHIFT, 0, 0},
+    {VKEY_RSHIFT, DomKey::SHIFT, 0, 0},
+    {VKEY_LCONTROL, DomKey::CONTROL, 0, 0},
+    {VKEY_RCONTROL, DomKey::CONTROL, 0, 0},
+    {VKEY_LMENU, DomKey::ALT, 0, 0},
+    {VKEY_RMENU, DomKey::ALT, 0, 0},
+    {VKEY_BROWSER_BACK, DomKey::BROWSER_BACK, 0, 0},
+    {VKEY_BROWSER_FORWARD, DomKey::BROWSER_FORWARD, 0, 0},
+    {VKEY_BROWSER_REFRESH, DomKey::BROWSER_REFRESH, 0, 0},
+    {VKEY_BROWSER_STOP, DomKey::BROWSER_STOP, 0, 0},
+    {VKEY_BROWSER_SEARCH, DomKey::BROWSER_SEARCH, 0, 0},
+    {VKEY_BROWSER_FAVORITES, DomKey::BROWSER_FAVORITES, 0, 0},
+    {VKEY_BROWSER_HOME, DomKey::BROWSER_HOME, 0, 0},
+    {VKEY_VOLUME_MUTE, DomKey::VOLUME_MUTE, 0, 0},
+    {VKEY_VOLUME_DOWN, DomKey::VOLUME_DOWN, 0, 0},
+    {VKEY_VOLUME_UP, DomKey::VOLUME_UP, 0, 0},
+    {VKEY_MEDIA_NEXT_TRACK, DomKey::MEDIA_TRACK_NEXT, 0, 0},
+    {VKEY_MEDIA_PREV_TRACK, DomKey::MEDIA_TRACK_PREVIOUS, 0, 0},
+    {VKEY_MEDIA_STOP, DomKey::MEDIA_STOP, 0, 0},
+    {VKEY_MEDIA_PLAY_PAUSE, DomKey::MEDIA_PLAY_PAUSE, 0, 0},
+    {VKEY_MEDIA_LAUNCH_MAIL, DomKey::LAUNCH_MAIL, 0, 0},
+    {VKEY_MEDIA_LAUNCH_MEDIA_SELECT, DomKey::LAUNCH_MEDIA_PLAYER, 0, 0},
+    {VKEY_MEDIA_LAUNCH_APP1, DomKey::LAUNCH_MY_COMPUTER, 0, 0},
+    {VKEY_MEDIA_LAUNCH_APP2, DomKey::LAUNCH_CALCULATOR, 0, 0},
+    {VKEY_OEM_8, DomKey::SUPER, 0, 0},  // ISO Level 5 Shift in ChromeOS
+    {VKEY_PROCESSKEY, DomKey::PROCESS, 0, 0},
+    {VKEY_DBE_SBCSCHAR, DomKey::HANKAKU, 0, 0},
+    {VKEY_DBE_DBCSCHAR, DomKey::ZENKAKU, 0, 0},
+    {VKEY_ATTN, DomKey::ATTN, 0, 0},
+    {VKEY_CRSEL, DomKey::CR_SEL, 0, 0},
+    {VKEY_EXSEL, DomKey::EX_SEL, 0, 0},
+    {VKEY_EREOF, DomKey::ERASE_EOF, 0, 0},
+    {VKEY_PLAY, DomKey::MEDIA_PLAY, 0, 0},
+    {VKEY_ZOOM, DomKey::ZOOM_TOGGLE, 0, 0},
+    {VKEY_OEM_CLEAR, DomKey::CLEAR, 0, 0},
+    {VKEY_ALTGR, DomKey::ALT_GRAPH, 0, 0},
+#if defined(OS_POSIX)
+    {VKEY_POWER, DomKey::POWER, 0, 0},
+    {VKEY_BRIGHTNESS_DOWN, DomKey::BRIGHTNESS_DOWN, 0, 0},
+    {VKEY_BRIGHTNESS_UP, DomKey::BRIGHTNESS_UP, 0, 0},
+    {VKEY_COMPOSE, DomKey::COMPOSE, 0, 0},
+    {VKEY_OEM_103, DomKey::MEDIA_REWIND, 0, 0},
+    {VKEY_OEM_104, DomKey::MEDIA_FAST_FORWARD, 0, 0},
+#endif
+};
+
+bool IsRightSideDomCode(DomCode code) {
+  return (code == DomCode::SHIFT_RIGHT) || (code == DomCode::CONTROL_RIGHT) ||
+         (code == DomCode::ALT_RIGHT) || (code == DomCode::OS_RIGHT);
+}
+
+bool IsModifierDomCode(DomCode code) {
+  return (code == DomCode::CONTROL_LEFT) || (code == DomCode::CONTROL_RIGHT) ||
+         (code == DomCode::SHIFT_LEFT) || (code == DomCode::SHIFT_RIGHT) ||
+         (code == DomCode::ALT_LEFT) || (code == DomCode::ALT_RIGHT) ||
+         (code == DomCode::OS_LEFT) || (code == DomCode::OS_RIGHT);
+}
+
+// Returns the Windows-based VKEY value corresponding to a DOM Level 3 |code|,
+// assuming a base US English layout. The returned VKEY is located
+// (e.g. VKEY_LSHIFT).
+KeyboardCode DomCodeToUsLayoutKeyboardCode(DomCode dom_code) {
+  const DomCodeToKeyboardCodeEntry* end =
+      kDomCodeToKeyboardCodeMap + arraysize(kDomCodeToKeyboardCodeMap);
+  const DomCodeToKeyboardCodeEntry* found =
+      std::lower_bound(kDomCodeToKeyboardCodeMap, end, dom_code,
+                       [](const DomCodeToKeyboardCodeEntry& a, DomCode b) {
+    return static_cast<int>(a.dom_code) < static_cast<int>(b);
+  });
+  if ((found != end) && (found->dom_code == dom_code))
+    return found->key_code;
+  return VKEY_UNKNOWN;
+}
+
+}  // anonymous namespace
+
+base::char16 GetCharacterFromKeyCode(KeyboardCode key_code, int flags) {
+  ui::DomKey dom_key;
+  base::char16 character;
+  if (GetMeaningFromKeyCode(key_code, flags, &dom_key, &character))
+    return character;
+  return 0;
+}
+
+bool GetMeaningFromKeyCode(KeyboardCode key_code,
+                           int flags,
+                           DomKey* dom_key,
+                           base::char16* character) {
   const bool ctrl = (flags & EF_CONTROL_DOWN) != 0;
   const bool shift = (flags & EF_SHIFT_DOWN) != 0;
   const bool upper = shift ^ ((flags & EF_CAPS_LOCK_DOWN) != 0);
 
-  // Following Windows behavior to map ctrl-a ~ ctrl-z to \x01 ~ \x1A.
-  if (key_code >= VKEY_A && key_code <= VKEY_Z) {
-    return static_cast<uint16>
-        (key_code - VKEY_A + (ctrl ? 1 : (upper ? 'A' : 'a')));
-  }
-
-  // Other ctrl characters
+  // Control characters.
   if (ctrl) {
+    // Following Windows behavior to map ctrl-a ~ ctrl-z to \x01 ~ \x1A.
+    if (key_code >= VKEY_A && key_code <= VKEY_Z) {
+      *character = static_cast<uint16>(key_code - VKEY_A + 1);
+      switch (key_code) {
+        case VKEY_H:
+          *dom_key = DomKey::BACKSPACE;
+          break;
+        case VKEY_I:
+          *dom_key = DomKey::TAB;
+          break;
+        case VKEY_J:
+        case VKEY_M:
+          *dom_key = DomKey::ENTER;
+          break;
+        default:
+          *dom_key = DomKey::CHARACTER;
+          break;
+      }
+      return true;
+    }
+    // Other control characters.
     if (shift) {
-      // following graphics chars require shift key to input.
+      // The following graphics characters require the shift key to input.
       switch (key_code) {
         // ctrl-@ maps to \x00 (Null byte)
         case VKEY_2:
-          return 0;
+          *dom_key = DomKey::CHARACTER;
+          *character = 0;
+          return true;
         // ctrl-^ maps to \x1E (Record separator, Information separator two)
         case VKEY_6:
-          return 0x1E;
+          *dom_key = DomKey::CHARACTER;
+          *character = 0x1E;
+          return true;
         // ctrl-_ maps to \x1F (Unit separator, Information separator one)
         case VKEY_OEM_MINUS:
-          return 0x1F;
+          *dom_key = DomKey::CHARACTER;
+          *character = 0x1F;
+          return true;
         // Returns 0 for all other keys to avoid inputting unexpected chars.
         default:
-          return 0;
+          *dom_key = DomKey::UNIDENTIFIED;
+          *character = 0;
+          return false;
       }
     } else {
       switch (key_code) {
         // ctrl-[ maps to \x1B (Escape)
         case VKEY_OEM_4:
-          return 0x1B;
+          *dom_key = DomKey::ESCAPE;
+          *character = 0x1B;
+          return true;
         // ctrl-\ maps to \x1C (File separator, Information separator four)
         case VKEY_OEM_5:
-          return 0x1C;
+          *dom_key = DomKey::CHARACTER;
+          *character = 0x1C;
+          return true;
         // ctrl-] maps to \x1D (Group separator, Information separator three)
         case VKEY_OEM_6:
-          return 0x1D;
+          *dom_key = DomKey::CHARACTER;
+          *character = 0x1D;
+          return true;
         // ctrl-Enter maps to \x0A (Line feed)
         case VKEY_RETURN:
-          return 0x0A;
+          *dom_key = DomKey::CHARACTER;
+          *character = 0x0A;
+          return true;
         // Returns 0 for all other keys to avoid inputting unexpected chars.
         default:
-          return 0;
+          *dom_key = DomKey::UNIDENTIFIED;
+          *character = 0;
+          return false;
       }
     }
   }
 
-  // For IME support.
-  if (key_code == ui::VKEY_PROCESSKEY)
-    return 0xE5;
-
-  // Normal characters
+  // ASCII alphanumeric characters.
+  if (key_code >= VKEY_A && key_code <= VKEY_Z) {
+    *dom_key = DomKey::CHARACTER;
+    *character = static_cast<uint16>(key_code - VKEY_A + (upper ? 'A' : 'a'));
+    return true;
+  }
   if (key_code >= VKEY_0 && key_code <= VKEY_9) {
-    return shift ? ")!@#$%^&*("[key_code - VKEY_0] :
-        static_cast<uint16>(key_code);
-  } else if (key_code >= VKEY_NUMPAD0 && key_code <= VKEY_NUMPAD9) {
-    return static_cast<uint16>(key_code - VKEY_NUMPAD0 + '0');
+    *dom_key = DomKey::CHARACTER;
+    *character =
+        shift ? ")!@#$%^&*("[key_code - VKEY_0] : static_cast<uint16>(key_code);
+    return true;
+  }
+  if (key_code >= VKEY_NUMPAD0 && key_code <= VKEY_NUMPAD9) {
+    *dom_key = DomKey::CHARACTER;
+    *character = static_cast<uint16>(key_code - VKEY_NUMPAD0 + '0');
+    return true;
+  }
+
+  // Function keys.
+  if (key_code >= VKEY_F1 && key_code <= VKEY_F24) {
+    *dom_key =
+        static_cast<DomKey>(key_code - VKEY_F1 + static_cast<int>(DomKey::F1));
+    *character = 0;
+    return true;
+  }
+
+  // Other keys.
+  for (size_t i = 0; i < arraysize(kKeyboardCodeToMeaning); ++i) {
+    if (kKeyboardCodeToMeaning[i].key_code == key_code) {
+      const KeyboardCodeToMeaning* p = &kKeyboardCodeToMeaning[i];
+      *dom_key = p->key;
+      *character = (shift && p->shift_character) ? p->shift_character
+                                                 : p->plain_character;
+      return true;
+    }
+  }
+  *dom_key = DomKey::UNIDENTIFIED;
+  *character = 0;
+  return false;
+}
+
+bool DomCodeToUsLayoutMeaning(DomCode dom_code,
+                              int flags,
+                              DomKey* out_dom_key,
+                              base::char16* out_character,
+                              KeyboardCode* out_key_code) {
+  if ((flags & EF_CONTROL_DOWN) == EF_CONTROL_DOWN) {
+    if (DomCodeToControlCharacter(dom_code, flags, out_dom_key, out_character,
+                                  out_key_code)) {
+      return true;
+    }
+    if (!IsModifierDomCode(dom_code)) {
+      *out_dom_key = DomKey::UNIDENTIFIED;
+      *out_character = 0;
+      *out_key_code = LocatedToNonLocatedKeyboardCode(
+          DomCodeToUsLayoutKeyboardCode(dom_code));
+      return true;
+    }
+  } else {
+    for (const auto& it : kPrintableCodeMap) {
+      if (it.dom_code == dom_code) {
+        int state = ((flags & EF_SHIFT_DOWN) == EF_SHIFT_DOWN);
+        base::char16 ch = it.character[state];
+        *out_dom_key = DomKey::CHARACTER;
+        *out_character = ch;
+        if ((flags & EF_CAPS_LOCK_DOWN) == EF_CAPS_LOCK_DOWN) {
+          ch |= 0x20;
+          if ((ch >= 'a') && (ch <= 'z'))
+            *out_character = it.character[state ^ 1];
+        }
+        *out_key_code = LocatedToNonLocatedKeyboardCode(
+            DomCodeToUsLayoutKeyboardCode(dom_code));
+        return true;
+      }
+    }
+  }
+  for (const auto& it : kNonPrintableCodeMap) {
+    if (it.dom_code == dom_code) {
+      *out_dom_key = it.dom_key;
+      *out_character = it.character;
+      *out_key_code = NonPrintableDomKeyToKeyboardCode(it.dom_key);
+      return true;
+    }
+  }
+  if ((flags & EF_CONTROL_DOWN) == EF_CONTROL_DOWN) {
+    *out_dom_key = DomKey::UNIDENTIFIED;
+    *out_character = 0;
+    *out_key_code = LocatedToNonLocatedKeyboardCode(
+        DomCodeToUsLayoutKeyboardCode(dom_code));
+    return true;
   }
+  return false;
+}
+
+bool DomCodeToControlCharacter(DomCode dom_code,
+                               int flags,
+                               DomKey* dom_key,
+                               base::char16* character,
+                               KeyboardCode* key_code) {
+  if ((flags & EF_CONTROL_DOWN) == 0)
+    return false;
+
+  int code = static_cast<int>(dom_code);
+  const int kKeyA = static_cast<int>(DomCode::KEY_A);
+  // Control-A - Control-Z map to 0x01 - 0x1A.
+  if (code >= kKeyA && code <= static_cast<int>(DomCode::KEY_Z)) {
+    *character = static_cast<base::char16>(code - kKeyA + 1);
+    switch (dom_code) {
+      case DomCode::KEY_H:
+        *dom_key = DomKey::BACKSPACE;
+        *key_code = VKEY_BACK;
+        break;
+      case DomCode::KEY_I:
+        *dom_key = DomKey::TAB;
+        *key_code = VKEY_TAB;
+        break;
+      case DomCode::KEY_M:
+        *dom_key = DomKey::ENTER;
+        *key_code = VKEY_RETURN;
+        break;
+      default:
+        *dom_key = DomKey::CHARACTER;
+        *key_code = static_cast<KeyboardCode>(code - kKeyA + VKEY_A);
+        break;
+    }
+    return true;
+  }
+
+  if (flags & EF_SHIFT_DOWN) {
+    switch (dom_code) {
+      case DomCode::DIGIT2:
+        // NUL
+        *character = 0;
+        *dom_key = DomKey::CHARACTER;
+        *key_code = VKEY_2;
+        return true;
+      case DomCode::DIGIT6:
+        // RS
+        *character = 0x1E;
+        *dom_key = DomKey::CHARACTER;
+        *key_code = VKEY_6;
+        return true;
+      case DomCode::MINUS:
+        // US
+        *character = 0x1F;
+        *dom_key = DomKey::CHARACTER;
+        *key_code = VKEY_OEM_MINUS;
+        return true;
+      default:
+        return false;
+    }
+  }
+
+  switch (dom_code) {
+    case DomCode::ENTER:
+      // NL
+      *character = 0x0A;
+      *dom_key = DomKey::CHARACTER;
+      *key_code = VKEY_RETURN;
+      return true;
+    case DomCode::BRACKET_LEFT:
+      // ESC
+      *character = 0x1B;
+      *dom_key = DomKey::ESCAPE;
+      *key_code = VKEY_OEM_4;
+      return true;
+    case DomCode::BACKSLASH:
+      // FS
+      *character = 0x1C;
+      *dom_key = DomKey::CHARACTER;
+      *key_code = VKEY_OEM_5;
+      return true;
+    case DomCode::BRACKET_RIGHT:
+      // GS
+      *character = 0x1D;
+      *dom_key = DomKey::CHARACTER;
+      *key_code = VKEY_OEM_6;
+      return true;
+    default:
+      return false;
+  }
+}
 
+DomKey CharacterToDomKey(uint32 character) {
+  switch (character) {
+    case 0x08:
+      return DomKey::BACKSPACE;
+    case 0x09:
+      return DomKey::TAB;
+    case 0x0D:
+      return DomKey::ENTER;
+    case 0x1B:
+      return DomKey::ESCAPE;
+    case 0x7F:
+      return DomKey::DEL;
+    default:
+      return DomKey::CHARACTER;
+  }
+}
+
+// Returns a Windows-based VKEY for a non-printable DOM Level 3 |key|.
+// The returned VKEY is non-positional (e.g. VKEY_SHIFT).
+KeyboardCode NonPrintableDomKeyToKeyboardCode(DomKey dom_key) {
+  for (const auto& it : kDomKeyToKeyboardCodeMap) {
+    if (it.dom_key == dom_key)
+      return it.key_code;
+  }
+  return VKEY_UNKNOWN;
+}
+
+// Determine the non-located VKEY corresponding to a located VKEY.
+KeyboardCode LocatedToNonLocatedKeyboardCode(KeyboardCode key_code) {
+  switch (key_code) {
+    case VKEY_RWIN:
+      return VKEY_LWIN;
+    case VKEY_LSHIFT:
+    case VKEY_RSHIFT:
+      return VKEY_SHIFT;
+    case VKEY_LCONTROL:
+    case VKEY_RCONTROL:
+      return VKEY_CONTROL;
+    case VKEY_LMENU:
+    case VKEY_RMENU:
+      return VKEY_MENU;
+    case VKEY_NUMPAD0:
+      return VKEY_0;
+    case VKEY_NUMPAD1:
+      return VKEY_1;
+    case VKEY_NUMPAD2:
+      return VKEY_2;
+    case VKEY_NUMPAD3:
+      return VKEY_3;
+    case VKEY_NUMPAD4:
+      return VKEY_4;
+    case VKEY_NUMPAD5:
+      return VKEY_5;
+    case VKEY_NUMPAD6:
+      return VKEY_6;
+    case VKEY_NUMPAD7:
+      return VKEY_7;
+    case VKEY_NUMPAD8:
+      return VKEY_8;
+    case VKEY_NUMPAD9:
+      return VKEY_9;
+    default:
+      return key_code;
+  }
+}
+
+// Determine the located VKEY corresponding to a non-located VKEY.
+KeyboardCode NonLocatedToLocatedKeyboardCode(KeyboardCode key_code,
+                                             DomCode dom_code) {
   switch (key_code) {
-    case VKEY_TAB:
-      return '\t';
-    case VKEY_RETURN:
-      return '\r';
-    case VKEY_MULTIPLY:
-      return '*';
-    case VKEY_ADD:
-      return '+';
-    case VKEY_SUBTRACT:
-      return '-';
-    case VKEY_DECIMAL:
-      return '.';
-    case VKEY_DIVIDE:
-      return '/';
-    case VKEY_SPACE:
-      return ' ';
-    case VKEY_OEM_1:
-      return shift ? ':' : ';';
-    case VKEY_OEM_PLUS:
-      return shift ? '+' : '=';
-    case VKEY_OEM_COMMA:
-      return shift ? '<' : ',';
-    case VKEY_OEM_MINUS:
-      return shift ? '_' : '-';
-    case VKEY_OEM_PERIOD:
-      return shift ? '>' : '.';
-    case VKEY_OEM_2:
-      return shift ? '?' : '/';
-    case VKEY_OEM_3:
-      return shift ? '~' : '`';
-    case VKEY_OEM_4:
-      return shift ? '{' : '[';
-    case VKEY_OEM_5:
-      return shift ? '|' : '\\';
-    case VKEY_OEM_6:
-      return shift ? '}' : ']';
-    case VKEY_OEM_7:
-      return shift ? '"' : '\'';
+    case VKEY_SHIFT:
+      return IsRightSideDomCode(dom_code) ? VKEY_RSHIFT : VKEY_LSHIFT;
+    case VKEY_CONTROL:
+      return IsRightSideDomCode(dom_code) ? VKEY_RCONTROL : VKEY_LCONTROL;
+    case VKEY_MENU:
+      return IsRightSideDomCode(dom_code) ? VKEY_RMENU : VKEY_LMENU;
+    case VKEY_LWIN:
+      return IsRightSideDomCode(dom_code) ? VKEY_RWIN : VKEY_LWIN;
+    case VKEY_0:
+      return (dom_code == DomCode::NUMPAD0) ? VKEY_NUMPAD0 : VKEY_0;
+    case VKEY_1:
+      return (dom_code == DomCode::NUMPAD1) ? VKEY_NUMPAD1 : VKEY_1;
+    case VKEY_2:
+      return (dom_code == DomCode::NUMPAD2) ? VKEY_NUMPAD2 : VKEY_2;
+    case VKEY_3:
+      return (dom_code == DomCode::NUMPAD3) ? VKEY_NUMPAD3 : VKEY_3;
+    case VKEY_4:
+      return (dom_code == DomCode::NUMPAD4) ? VKEY_NUMPAD4 : VKEY_4;
+    case VKEY_5:
+      return (dom_code == DomCode::NUMPAD5) ? VKEY_NUMPAD5 : VKEY_5;
+    case VKEY_6:
+      return (dom_code == DomCode::NUMPAD6) ? VKEY_NUMPAD6 : VKEY_6;
+    case VKEY_7:
+      return (dom_code == DomCode::NUMPAD7) ? VKEY_NUMPAD7 : VKEY_7;
+    case VKEY_8:
+      return (dom_code == DomCode::NUMPAD8) ? VKEY_NUMPAD8 : VKEY_8;
+    case VKEY_9:
+      return (dom_code == DomCode::NUMPAD9) ? VKEY_NUMPAD9 : VKEY_9;
     default:
-      return 0;
+      return key_code;
+  }
+}
+
+DomCode UsLayoutKeyboardCodeToDomCode(KeyboardCode key_code) {
+  key_code = NonLocatedToLocatedKeyboardCode(key_code, DomCode::NONE);
+  for (const auto& it : kDomCodeToKeyboardCodeMap) {
+    if (it.key_code == key_code)
+      return it.dom_code;
+  }
+  for (const auto& it : kFallbackKeyboardCodeToDomCodeMap) {
+    if (it.key_code == key_code)
+      return it.dom_code;
   }
+  return DomCode::NONE;
 }
 
 }  // namespace ui