Generate correct KeyboardCode (VKEY).

ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.h"
 
 #include <xkbcommon/xkbcommon-names.h>
 
 #include "base/logging.h"
 #include "ui/events/event_constants.h"
+#include "ui/events/keycodes/dom3/dom_code.h"
 #include "ui/events/keycodes/dom3/dom_key.h"
 #include "ui/events/keycodes/dom4/keycode_converter.h"
 #include "ui/events/ozone/layout/layout_util.h"
 #include "ui/events/ozone/layout/xkb/xkb_keyboard_code_conversion.h"
 
 namespace ui {
 
 namespace {
 
 // Temporarily hard-code an initial layout to test libxkbcommon.
@@ skipping 177 matching lines @@
     case 0x0A:
     case 0x0D:
       return DomKey::ENTER;
     case 0x1B:
       return DomKey::ESCAPE;
     default:
       return DomKey::CHARACTER;
   }
 }
 
-KeyboardCode DifficultKeyboardCode(DomCode dom_code,
-                                   int flags,
-                                   DomKey dom_key,
-                                   base::char16 character) {
-  // TODO(kpschoedel): correct key_code for non-US layouts along the lines
-  // of KeyboardCodeFromXKeyEvent()
-  return DomCodeToKeyboardCode(dom_code);
+KeyboardCode AlphanumericKeyboardCode(base::char16 character) {
+  // Plain ASCII letters and digits map directly to VKEY values.
+  if ((character >= '0') && (character <= '9'))
+    return static_cast<KeyboardCode>(VKEY_0 + character - '0');
+  if ((character >= 'a') && (character <= 'z'))
+    return static_cast<KeyboardCode>(VKEY_A + character - 'a');
+  if ((character >= 'A') && (character <= 'Z'))
+    return static_cast<KeyboardCode>(VKEY_A + character - 'A');
+  return VKEY_UNKNOWN;
 }
 
+// These tables map layout-dependent printable characters/codes
+// to legacy Windows-based VKEY values.
+//
+// VKEYs are determined by the character produced from a DomCode without
+// any modifiers, plus zero or more of the DomCode itself, the character
+// produced with the Shift modifier, and the character produced with the
+// AltGr modifier.
+
+// A table of one or more PrintableSubEntry cases applies when the VKEY is
+// not determined by the unmodified character value alone. Each such table
+// corresponds to one unmodified character value. For an entry to match,
+// the dom_code must match, and, if test_X is set, then the character for
+// the key plus modifier X must also match.
+struct PrintableSubEntry {
+  DomCode dom_code;
+  bool test_shift : 1;
+  bool test_altgr : 1;
+  base::char16 shift_character;
+  base::char16 altgr_character;
+  KeyboardCode key_code;
+};
+
+const base::char16 kNone = 0xFFFE;
+const base::char16 kAny = 0xFFFF;
+
+// U+0021 exclamation mark
+const PrintableSubEntry kU0021[] = {
+    {DomCode::DIGIT1, 0, 0, kAny, kAny, VKEY_1},
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::SLASH, 0, 0, kAny, kAny, VKEY_OEM_8}};
+
+// U+0022 quote
+const PrintableSubEntry kU0022[] = {
+    {DomCode::DIGIT2, 0, 0, kAny, kAny, VKEY_2},
+    {DomCode::DIGIT3, 0, 0, kAny, kAny, VKEY_3}};
+
+// U+0023 number sign
+const PrintableSubEntry kU0023[] = {
+    {DomCode::BACKQUOTE, 0, 0, kAny, kAny, VKEY_OEM_7},
+    {DomCode::BACKSLASH, 1, 0, 0x0027, kAny, VKEY_OEM_2},   // apostrophe
+    {DomCode::BACKSLASH, 1, 1, 0x007E, kNone, VKEY_OEM_7}};  // ~, NoSymbol
+
+// U+0024 dollar sign
+const PrintableSubEntry kU0024[] = {
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_8}};
+
+// U+0027 apostrophe
+const PrintableSubEntry kU0027[] = {
+    {DomCode::DIGIT4, 0, 0, kAny, kAny, VKEY_4},
+    {DomCode::KEY_Q, 0, 0, kAny, kAny, VKEY_OEM_7},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::SLASH, 0, 0, kAny, kAny, VKEY_OEM_7},
+    {DomCode::QUOTE, 1, 0, 0x0022, kAny, VKEY_OEM_7},      // quote
+    {DomCode::BACKQUOTE, 1, 0, 0x0022, kAny, VKEY_OEM_3},  // quote
+    {DomCode::BACKQUOTE, 1, 0, 0x00B7, kAny, VKEY_OEM_5},  // middle dot
+    {DomCode::BACKSLASH, 1, 0, kNone, kAny, VKEY_OEM_5},  // NoSymbol
+    {DomCode::MINUS, 1, 1, 0x003F, kNone, VKEY_OEM_4},      // ?, NoSymbol
+    {DomCode::MINUS, 1, 1, 0x003F, 0x00DD, VKEY_OEM_4},      // ?, Y acute
+    {DomCode::EQUAL, 1, 1, 0x002A, kNone, VKEY_OEM_PLUS},   // *, NoSymbol
+    {DomCode::QUOTE, 1, 1, 0x0040, kNone, VKEY_OEM_3},      // @, NoSymbol
+    {DomCode::BACKSLASH, 1, 1, 0x002A, kNone, VKEY_OEM_2},  // *, NoSymbol
+    {DomCode::BACKSLASH, 1, 1, 0x002A, 0x00BD, VKEY_OEM_5},  // *, one half
+    {DomCode::BACKSLASH, 1, 1, 0x002A, 0x0141, VKEY_OEM_2},  // *, L stroke
+    {DomCode::KEY_Z, 1, 1, 0x0022, kNone, VKEY_Z},          // quote, NoSymbol
+    {DomCode::KEY_Z, 1, 1, 0x0022, 0x0158, VKEY_OEM_7}};     // quote, R caron
+
+// U+0028 left parenthesis
+const PrintableSubEntry kU0028[] = {
+    {DomCode::DIGIT5, 0, 0, kAny, kAny, VKEY_5},
+    {DomCode::DIGIT9, 0, 0, kAny, kAny, VKEY_9},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5}};
+
+// U+0029 right parenthesis
+const PrintableSubEntry kU0029[] = {
+    {DomCode::DIGIT0, 0, 0, kAny, kAny, VKEY_0},
+    {DomCode::MINUS, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6}};
+
+// U+002A *
+const PrintableSubEntry kU002A[] = {
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5}};
+
+// U+002B plus sign
+const PrintableSubEntry kU002B[] = {
+    {DomCode::DIGIT1, 0, 0, kAny, kAny, VKEY_1},
+    {DomCode::EQUAL, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::SEMICOLON, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_2},
+    {DomCode::MINUS, 1, 1, 0x003F, kNone, VKEY_OEM_PLUS},   // ?, NoSymbol
+    {DomCode::MINUS, 1, 1, 0x003F, 0x005C, VKEY_OEM_MINUS},  // ?, backslash
+    {DomCode::MINUS, 1, 1, 0x003F, 0x0151, VKEY_OEM_PLUS}};  // ?, o''
+
+// U+002C comma
+const PrintableSubEntry kU002C[] = {
+    {DomCode::DIGIT3, 0, 0, kAny, kAny, VKEY_3},
+    {DomCode::DIGIT5, 0, 0, kAny, kAny, VKEY_5},
+    {DomCode::DIGIT6, 0, 0, kAny, kAny, VKEY_6},
+    {DomCode::DIGIT9, 0, 0, kAny, kAny, VKEY_9},
+    {DomCode::KEY_W, 0, 0, kAny, kAny, VKEY_OEM_COMMA},
+    {DomCode::KEY_V, 0, 0, kAny, kAny, VKEY_OEM_COMMA},
+    {DomCode::KEY_M, 0, 0, kAny, kAny, VKEY_OEM_COMMA},
+    {DomCode::COMMA, 0, 0, kAny, kAny, VKEY_OEM_COMMA}};
+
+// U+002D hyphen-minus
+const PrintableSubEntry kU002D[] = {
+    {DomCode::DIGIT2, 0, 0, kAny, kAny, VKEY_2},
+    {DomCode::DIGIT6, 0, 0, kAny, kAny, VKEY_6},
+    {DomCode::MINUS, 0, 0, kAny, kAny, VKEY_OEM_MINUS},
+    {DomCode::KEY_A, 0, 0, kAny, kAny, VKEY_OEM_MINUS},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_MINUS},
+    {DomCode::SLASH, 1, 0, 0x003D, kAny, VKEY_OEM_MINUS},   // =
+    {DomCode::EQUAL, 1, 1, 0x005F, kNone, VKEY_OEM_MINUS},   // _, NoSymbol
+    {DomCode::EQUAL, 1, 1, 0x005F, 0x0157, VKEY_OEM_4},       // _, r cedilla
+    {DomCode::SLASH, 1, 1, 0x005F, kNone, VKEY_OEM_MINUS},   // _, NoSymbol
+    {DomCode::SLASH, 1, 1, 0x005F, 0x002A, VKEY_OEM_MINUS},   // _, *
+    {DomCode::SLASH, 1, 1, 0x005F, 0x002F, VKEY_OEM_2},       // _, /
+    {DomCode::SLASH, 1, 1, 0x005F, 0x006E, VKEY_OEM_MINUS}};  // _, n
+
+// U+002E full stop
+const PrintableSubEntry kU002E[] = {
+    {DomCode::DIGIT7, 0, 0, kAny, kAny, VKEY_7},
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::KEY_E, 0, 0, kAny, kAny, VKEY_OEM_PERIOD},
+    {DomCode::KEY_R, 0, 0, kAny, kAny, VKEY_OEM_PERIOD},
+    {DomCode::KEY_O, 0, 0, kAny, kAny, VKEY_OEM_PERIOD},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7},
+    {DomCode::PERIOD, 0, 0, kAny, kAny, VKEY_OEM_PERIOD},
+    {DomCode::SLASH, 0, 0, kAny, kAny, VKEY_OEM_2}};
+
+// U+002F /
+const PrintableSubEntry kU002F[] = {
+    {DomCode::MINUS, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_2},
+    {DomCode::BACKQUOTE, 0, 0, kAny, kAny, VKEY_OEM_7},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5},
+    {DomCode::SLASH, 0, 0, kAny, kAny, VKEY_OEM_2},
+    {DomCode::DIGIT3, 1, 0, 0x0033, kAny, VKEY_3},       // 3
+    {DomCode::DIGIT3, 1, 0, 0x003F, kAny, VKEY_OEM_2},   // ?
+    {DomCode::DIGIT0, 1, 0, 0x0030, kAny, VKEY_0},       // 0
+    {DomCode::DIGIT0, 1, 0, 0x003F, kAny, VKEY_OEM_2}};  // ?
+
+// U+003A colon
+const PrintableSubEntry kU003A[] = {
+    {DomCode::DIGIT1, 0, 0, kAny, kAny, VKEY_1},
+    {DomCode::DIGIT5, 0, 0, kAny, kAny, VKEY_5},
+    {DomCode::DIGIT6, 0, 0, kAny, kAny, VKEY_6},
+    {DomCode::PERIOD, 0, 0, kAny, kAny, VKEY_OEM_2}};
+
+// U+003B semicolon
+const PrintableSubEntry kU003B[] = {
+    {DomCode::DIGIT4, 0, 0, kAny, kAny, VKEY_4},
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::KEY_Q, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::SEMICOLON, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::BACKQUOTE, 0, 0, kAny, kAny, VKEY_OEM_3},
+    {DomCode::KEY_Z, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::COMMA, 0, 0, kAny, kAny, VKEY_OEM_PERIOD},
+    {DomCode::SLASH, 0, 0, kAny, kAny, VKEY_OEM_2}};
+
+// U+003D =
+const PrintableSubEntry kU003D[] = {
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::EQUAL, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::SLASH, 1, 0, 0x0025, kAny, VKEY_OEM_8},       // %
+    {DomCode::SLASH, 1, 0, 0x002B, kAny, VKEY_OEM_PLUS},    // +
+    {DomCode::MINUS, 1, 1, 0x0025, kNone, VKEY_OEM_PLUS},    // %, NoSymbol
+    {DomCode::MINUS, 1, 1, 0x0025, 0x002D, VKEY_OEM_MINUS}};  // %, -
+
+// U+003F ?
+const PrintableSubEntry kU003F[] = {
+    {DomCode::DIGIT2, 0, 0, kAny, kAny, VKEY_2},
+    {DomCode::DIGIT7, 0, 0, kAny, kAny, VKEY_7},
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::MINUS, 0, 0, kAny, kAny, VKEY_OEM_PLUS}};
+
+// U+0040 @
+const PrintableSubEntry kU0040[] = {
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::BACKQUOTE, 0, 0, kAny, kAny, VKEY_OEM_7}};
+
+// U+005B left square bracket
+const PrintableSubEntry kU005B[] = {
+    {DomCode::DIGIT1, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::MINUS, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7}};
+
+// U+005C backslash
+const PrintableSubEntry kU005C[] = {
+    {DomCode::EQUAL, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::BACKSLASH, 1, 0, 0x002F, kAny, VKEY_OEM_7},   // /
+    {DomCode::BACKSLASH, 1, 0, 0x007C, kAny, VKEY_OEM_5},   // |
+    {DomCode::BACKQUOTE, 1, 1, 0x007C, 0x0031, VKEY_OEM_5},   // |, 1
+    {DomCode::BACKQUOTE, 1, 1, 0x007C, 0x0145, VKEY_OEM_3}};  // |, N cedilla
+
+// U+005D right square bracket
+const PrintableSubEntry kU005D[] = {
+    {DomCode::DIGIT2, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::EQUAL, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::BACKQUOTE, 0, 0, kAny, kAny, VKEY_OEM_3},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5}};
+
+// U+005F _
+const PrintableSubEntry kU005F[] = {
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::MINUS, 0, 0, kAny, kAny, VKEY_OEM_MINUS}};
+
+// U+0060 grave accent
+const PrintableSubEntry kU0060[] = {
+    {DomCode::BACKQUOTE, 1, 0, kNone, kAny, VKEY_OEM_3},   // NoSymbol
+    {DomCode::BACKQUOTE, 1, 0, 0x00AC, kAny, VKEY_OEM_8},   // not
+    {DomCode::BACKQUOTE, 1, 1, 0x007E, kNone, VKEY_OEM_3},   // ~, NoSymbol
+    {DomCode::BACKQUOTE, 1, 1, 0x007E, 0x0031, VKEY_OEM_3},   // ~, 1
+    {DomCode::BACKQUOTE, 1, 1, 0x007E, 0x003B, VKEY_OEM_3},   // ~, ;
+    {DomCode::BACKQUOTE, 1, 1, 0x007E, 0x0060, VKEY_OEM_3},   // ~, `
+    {DomCode::BACKQUOTE, 1, 1, 0x007E, 0x00BF, VKEY_OEM_3},   // ~, inverted ?
+    {DomCode::BACKQUOTE, 1, 1, 0x007E, 0x0151, VKEY_OEM_3}};  // ~, o''
+
+// U+00A7 section
+const PrintableSubEntry kU00A7[] = {
+    {DomCode::DIGIT4, 0, 0, kAny, kAny, VKEY_4},
+    {DomCode::DIGIT6, 0, 0, kAny, kAny, VKEY_6},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7},
+    {DomCode::BACKQUOTE, 1, 0, 0x00B0, kAny, VKEY_OEM_2},   // degree
+    {DomCode::BACKQUOTE, 1, 0, 0x00BD, kAny, VKEY_OEM_5}};  // one half
+
+// U+00AB left-pointing double angle quote
+const PrintableSubEntry kU00AB[] = {
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::EQUAL, 0, 0, kAny, kAny, VKEY_OEM_6}};
+
+// U+00B0 degree
+const PrintableSubEntry kU00B0[] = {
+    {DomCode::EQUAL, 0, 0, kAny, kAny, VKEY_OEM_2},
+    {DomCode::BACKQUOTE, 0, 0, kAny, kAny, VKEY_OEM_7}};
+
+// U+00BA masculine ordinal indicator
+const PrintableSubEntry kU00BA[] = {
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7},
+    {DomCode::BACKQUOTE, 0, 0, kAny, kAny, VKEY_OEM_5}};
+
+// U+00E0 a grave
+const PrintableSubEntry kU00E0[] = {
+    {DomCode::DIGIT0, 0, 0, kAny, kAny, VKEY_0},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5},
+    {DomCode::QUOTE, 1, 0, 0x00B0, kAny, VKEY_OEM_7},   // degree
+    {DomCode::QUOTE, 1, 0, 0x00E4, kAny, VKEY_OEM_5}};  // a diaeresis
+
+// U+00E1 a acute
+const PrintableSubEntry kU00E1[] = {
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7}};
+
+// U+00E2 a circumflex
+const PrintableSubEntry kU00E2[] = {
+    {DomCode::DIGIT2, 0, 0, kAny, kAny, VKEY_2},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5}};
+
+// U+00E4 a diaeresis
+const PrintableSubEntry kU00E4[] = {
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::QUOTE, 1, 0, 0x00E0, kAny, VKEY_OEM_5},   // a grave
+    {DomCode::QUOTE, 1, 1, 0x00C4, kNone, VKEY_OEM_7},   // A dia., NoSymbol
+    {DomCode::QUOTE, 1, 1, 0x00C4, 0x015A, VKEY_OEM_7},   // A dia., S acute
+    {DomCode::QUOTE, 1, 1, 0x00C4, 0x0159, VKEY_OEM_7}};  // A dia., r caron
+
+// U+00E6 ae
+const PrintableSubEntry kU00E6[] = {
+    {DomCode::SEMICOLON, 0, 0, kAny, kAny, VKEY_OEM_3},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7}};
+
+// U+00E7 c cedilla
+const PrintableSubEntry kU00E7[] = {
+    {DomCode::DIGIT9, 0, 0, kAny, kAny, VKEY_9},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_2},
+    {DomCode::COMMA, 0, 0, kAny, kAny, VKEY_OEM_COMMA},
+    {DomCode::SEMICOLON, 1, 1, 0x00C7, kNone, VKEY_OEM_1},   // C ced., NoSy
+    {DomCode::SEMICOLON, 1, 1, 0x00C7, 0x00DE, VKEY_OEM_3}};  // C ced., Thorn
+
+// U+00E8 e grave
+const PrintableSubEntry kU00E8[] = {
+    {DomCode::DIGIT7, 0, 0, kAny, kAny, VKEY_7},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_3}};
+
+// U+00E9 e acute
+const PrintableSubEntry kU00E9[] = {
+    {DomCode::DIGIT2, 0, 0, kAny, kAny, VKEY_2},
+    {DomCode::DIGIT0, 0, 0, kAny, kAny, VKEY_0},
+    {DomCode::SLASH, 0, 0, kAny, kAny, VKEY_OEM_2},
+    {DomCode::SEMICOLON, 1, 0, 0x00C9, kAny, VKEY_OEM_1},   // E acute
+    {DomCode::SEMICOLON, 1, 0, 0x00F6, kAny, VKEY_OEM_7}};  // o diaeresis
+
+// U+00ED i acute
+const PrintableSubEntry kU00ED[] = {
+    {DomCode::DIGIT9, 0, 0, kAny, kAny, VKEY_9},
+    {DomCode::BACKQUOTE, 0, 0, kAny, kAny, VKEY_0}};
+
+// U+00F0 eth
+const PrintableSubEntry kU00F0[] = {
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_6},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_1}};
+
+// U+00F3 o acute
+const PrintableSubEntry kU00F3[] = {
+    {DomCode::EQUAL, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5}};
+
+// U+00F4 o circumflex
+const PrintableSubEntry kU00F4[] = {
+    {DomCode::DIGIT4, 0, 0, kAny, kAny, VKEY_4},
+    {DomCode::SEMICOLON, 0, 0, kAny, kAny, VKEY_OEM_1}};
+
+// U+00F6 o diaeresis
+const PrintableSubEntry kU00F6[] = {
+    {DomCode::DIGIT0, 0, 0, kAny, kAny, VKEY_OEM_3},
+    {DomCode::MINUS, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::SEMICOLON, 1, 0, 0x00E9, kAny, VKEY_OEM_7},   // e acute
+    {DomCode::SEMICOLON, 1, 1, 0x00D6, kNone, VKEY_OEM_3},   // O dia., NoSy
+    {DomCode::SEMICOLON, 1, 1, 0x00D6, 0x0162, VKEY_OEM_3}};  // O dia., T ced.
+
+// U+00F8 o stroke
+const PrintableSubEntry kU00F8[] = {
+    {DomCode::SEMICOLON, 0, 0, kAny, kAny, VKEY_OEM_3},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7}};
+
+// U+00F9 u grave
+const PrintableSubEntry kU00F9[] = {
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_3},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_2}};
+
+// U+00FA u acute
+const PrintableSubEntry kU00FA[] = {
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6}};
+
+// U+00FC u diaeresis
+const PrintableSubEntry kU00FC[] = {
+    {DomCode::KEY_W, 0, 0, kAny, kAny, VKEY_W},
+    {DomCode::BRACKET_LEFT, 1, 0, 0x00E8, kAny, VKEY_OEM_1},   // e grave
+    {DomCode::MINUS, 1, 1, 0x00DC, kNone, VKEY_OEM_2},          // U dia., NoSy
+    {DomCode::BRACKET_LEFT, 1, 1, 0x00DC, kNone, VKEY_OEM_1},   // U dia., NoSy
+    {DomCode::BRACKET_LEFT, 1, 1, 0x00DC, 0x0141, VKEY_OEM_3}};  // U dia., L-
+
+// U+0103 a breve
+const PrintableSubEntry kU0103[] = {
+    {DomCode::DIGIT1, 0, 0, kAny, kAny, VKEY_1},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_4}};
+
+// U+0105 a ogonek
+const PrintableSubEntry kU0105[] = {
+    {DomCode::DIGIT1, 0, 0, kAny, kAny, VKEY_1},
+    {DomCode::KEY_Q, 0, 0, kAny, kAny, VKEY_Q},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7}};
+
+// U+010D c caron
+const PrintableSubEntry kU010D[] = {
+    {DomCode::DIGIT2, 0, 0, kAny, kAny, VKEY_2},
+    {DomCode::DIGIT4, 0, 0, kAny, kAny, VKEY_4},
+    {DomCode::KEY_P, 0, 0, kAny, kAny, VKEY_X},
+    {DomCode::SEMICOLON, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::COMMA, 0, 0, kAny, kAny, VKEY_OEM_COMMA}};
+
+// U+0111 d stroke
+const PrintableSubEntry kU0111[] = {
+    {DomCode::DIGIT0, 0, 0, kAny, kAny, VKEY_0},
+    {DomCode::BRACKET_RIGHT, 0, 0, kAny, kAny, VKEY_OEM_6}};
+
+// U+0117 e dot above
+const PrintableSubEntry kU0117[] = {
+    {DomCode::DIGIT4, 0, 0, kAny, kAny, VKEY_4},
+    {DomCode::QUOTE, 0, 0, kAny, kAny, VKEY_OEM_7}};
+
+// U+0119 e ogonek
+const PrintableSubEntry kU0119[] = {
+    {DomCode::DIGIT3, 0, 0, kAny, kAny, VKEY_3},
+    {DomCode::SLASH, 1, 1, 0x0118, kNone, VKEY_OEM_MINUS},  // E ogonek, NoSy
+    {DomCode::SLASH, 1, 1, 0x0118, 0x006E, VKEY_OEM_2}};     // E ogonek, n
+
+// U+012F i ogonek
+const PrintableSubEntry kU012F[] = {
+    {DomCode::DIGIT5, 0, 0, kAny, kAny, VKEY_5},
+    {DomCode::BRACKET_LEFT, 1, 1, 0x012E, kNone, VKEY_OEM_4}};  // Iogonek, NoSy
+
+// U+0142 l stroke
+const PrintableSubEntry kU0142[] = {
+    {DomCode::SEMICOLON, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_2}};
+
+// U+015F s cedilla
+const PrintableSubEntry kU015F[] = {
+    {DomCode::SEMICOLON, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::PERIOD, 0, 0, kAny, kAny, VKEY_OEM_PERIOD}};
+
+// U+0161 s caron
+const PrintableSubEntry kU0161[] = {
+    {DomCode::DIGIT3, 0, 0, kAny, kAny, VKEY_3},
+    {DomCode::DIGIT6, 0, 0, kAny, kAny, VKEY_6},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::KEY_A, 0, 0, kAny, kAny, VKEY_OEM_1},
+    {DomCode::KEY_F, 0, 0, kAny, kAny, VKEY_F},
+    {DomCode::PERIOD, 0, 0, kAny, kAny, VKEY_OEM_PERIOD}};
+
+// U+016B u macron
+const PrintableSubEntry kU016B[] = {
+    {DomCode::DIGIT8, 0, 0, kAny, kAny, VKEY_8},
+    {DomCode::KEY_Q, 0, 0, kAny, kAny, VKEY_Q},
+    {DomCode::KEY_X, 0, 0, kAny, kAny, VKEY_X}};
+
+// U+0173 u ogonek
+const PrintableSubEntry kU0173[] = {
+    {DomCode::DIGIT7, 0, 0, kAny, kAny, VKEY_7},
+    {DomCode::SEMICOLON, 1, 1, 0x0172, kNone, VKEY_OEM_3},   // U ogo., NoSy
+    {DomCode::SEMICOLON, 1, 1, 0x0172, 0x0162, VKEY_OEM_1}};  // U ogo., T ced.
+
+// U+017C z dot above
+const PrintableSubEntry kU017C[] = {
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_OEM_4},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5}};
+
+// U+017E z caron
+const PrintableSubEntry kU017E[] = {
+    {DomCode::DIGIT6, 0, 0, kAny, kAny, VKEY_6},
+    {DomCode::EQUAL, 0, 0, kAny, kAny, VKEY_OEM_PLUS},
+    {DomCode::KEY_W, 0, 0, kAny, kAny, VKEY_W},
+    {DomCode::BRACKET_LEFT, 0, 0, kAny, kAny, VKEY_Y},
+    {DomCode::BACKSLASH, 0, 0, kAny, kAny, VKEY_OEM_5}};
+
+// Table mapping unshifted characters to PrintableSubEntry tables.
+struct PrintableMultiEntry {
+  base::char16 plain_character;
+  const PrintableSubEntry* subtable;
+  size_t subtable_size;
+};
+
+// Entries are ordered by character value.
+const PrintableMultiEntry kMultiMap[] = {
+    {0x0021, kU0021, arraysize(kU0021)},  // exclamation mark
+    {0x0022, kU0022, arraysize(kU0022)},  // quotation mark
+    {0x0023, kU0023, arraysize(kU0023)},  // number sign
+    {0x0024, kU0024, arraysize(kU0024)},  // dollar sign
+    {0x0027, kU0027, arraysize(kU0027)},  // apostrophe
+    {0x0028, kU0028, arraysize(kU0028)},  // left parenthesis
+    {0x0029, kU0029, arraysize(kU0029)},  // right parenthesis
+    {0x002A, kU002A, arraysize(kU002A)},  // asterisk
+    {0x002B, kU002B, arraysize(kU002B)},  // plus sign
+    {0x002C, kU002C, arraysize(kU002C)},  // comma
+    {0x002D, kU002D, arraysize(kU002D)},  // hyphen-minus
+    {0x002E, kU002E, arraysize(kU002E)},  // full stop
+    {0x002F, kU002F, arraysize(kU002F)},  // solidus
+    {0x003A, kU003A, arraysize(kU003A)},  // colon
+    {0x003B, kU003B, arraysize(kU003B)},  // semicolon
+    {0x003D, kU003D, arraysize(kU003D)},  // equals sign
+    {0x003F, kU003F, arraysize(kU003F)},  // question mark
+    {0x0040, kU0040, arraysize(kU0040)},  // commercial at
+    {0x005B, kU005B, arraysize(kU005B)},  // left square bracket
+    {0x005C, kU005C, arraysize(kU005C)},  // reverse solidus
+    {0x005D, kU005D, arraysize(kU005D)},  // right square bracket
+    {0x005F, kU005F, arraysize(kU005F)},  // low line
+    {0x0060, kU0060, arraysize(kU0060)},  // grave accent
+    {0x00A7, kU00A7, arraysize(kU00A7)},  // section sign
+    {0x00AB, kU00AB, arraysize(kU00AB)},  // left double angle quotation mark
+    {0x00B0, kU00B0, arraysize(kU00B0)},  // degree sign
+    {0x00BA, kU00BA, arraysize(kU00BA)},  // masculine ordinal indicator
+    {0x00E0, kU00E0, arraysize(kU00E0)},  // a grave
+    {0x00E1, kU00E1, arraysize(kU00E1)},  // a acute
+    {0x00E2, kU00E2, arraysize(kU00E2)},  // a circumflex
+    {0x00E4, kU00E4, arraysize(kU00E4)},  // a diaeresis
+    {0x00E6, kU00E6, arraysize(kU00E6)},  // ae
+    {0x00E7, kU00E7, arraysize(kU00E7)},  // c cedilla
+    {0x00E8, kU00E8, arraysize(kU00E8)},  // e grave
+    {0x00E9, kU00E9, arraysize(kU00E9)},  // e acute
+    {0x00ED, kU00ED, arraysize(kU00ED)},  // i acute
+    {0x00F0, kU00F0, arraysize(kU00F0)},  // eth
+    {0x00F3, kU00F3, arraysize(kU00F3)},  // o acute
+    {0x00F4, kU00F4, arraysize(kU00F4)},  // o circumflex
+    {0x00F6, kU00F6, arraysize(kU00F6)},  // o diaeresis
+    {0x00F8, kU00F8, arraysize(kU00F8)},  // o stroke
+    {0x00F9, kU00F9, arraysize(kU00F9)},  // u grave
+    {0x00FA, kU00FA, arraysize(kU00FA)},  // u acute
+    {0x00FC, kU00FC, arraysize(kU00FC)},  // u diaeresis
+    {0x0103, kU0103, arraysize(kU0103)},  // a breve
+    {0x0105, kU0105, arraysize(kU0105)},  // a ogonek
+    {0x010D, kU010D, arraysize(kU010D)},  // c caron
+    {0x0111, kU0111, arraysize(kU0111)},  // d stroke
+    {0x0117, kU0117, arraysize(kU0117)},  // e dot above
+    {0x0119, kU0119, arraysize(kU0119)},  // e ogonek
+    {0x012F, kU012F, arraysize(kU012F)},  // i ogonek
+    {0x0142, kU0142, arraysize(kU0142)},  // l stroke
+    {0x015F, kU015F, arraysize(kU015F)},  // s cedilla
+    {0x0161, kU0161, arraysize(kU0161)},  // s caron
+    {0x016B, kU016B, arraysize(kU016B)},  // u macron
+    {0x0173, kU0173, arraysize(kU0173)},  // u ogonek
+    {0x017C, kU017C, arraysize(kU017C)},  // z dot above
+    {0x017E, kU017E, arraysize(kU017E)},  // z caron
+};
+
+// Table mapping unshifted characters to VKEY values.
+struct PrintableSimpleEntry {
+  base::char16 plain_character;
+  KeyboardCode key_code;
+};
+
+// Entries are ordered by character value.
+const PrintableSimpleEntry kSimpleMap[] = {
+    {0x0025, VKEY_5},          // percent sign
+    {0x0026, VKEY_1},          // ampersand
+    {0x003C, VKEY_OEM_5},      // less-than sign
+    {0x007B, VKEY_OEM_7},      // left curly bracket
+    {0x007C, VKEY_OEM_5},      // vertical line
+    {0x007D, VKEY_OEM_2},      // right curly bracket
+    {0x007E, VKEY_OEM_5},      // tilde
+    {0x00A1, VKEY_OEM_6},      // inverted exclamation mark
+    {0x00AD, VKEY_OEM_3},      // soft hyphen
+    {0x00B2, VKEY_OEM_7},      // superscript two
+    {0x00B5, VKEY_OEM_5},      // micro sign
+    {0x00BB, VKEY_9},          // right-pointing double angle quotation mark
+    {0x00BD, VKEY_OEM_5},      // vulgar fraction one half
+    {0x00BF, VKEY_OEM_6},      // inverted question mark
+    {0x00DF, VKEY_OEM_4},      // sharp s
+    {0x00E5, VKEY_OEM_6},      // a ring above
+    {0x00EA, VKEY_3},          // e circumflex
+    {0x00EB, VKEY_OEM_1},      // e diaeresis
+    {0x00EC, VKEY_OEM_6},      // i grave
+    {0x00EE, VKEY_OEM_6},      // i circumflex
+    {0x00F1, VKEY_OEM_3},      // n tilde
+    {0x00F2, VKEY_OEM_3},      // o grave
+    {0x00F5, VKEY_OEM_4},      // o tilde
+    {0x00F7, VKEY_OEM_6},      // division sign
+    {0x00FD, VKEY_7},          // y acute
+    {0x00FE, VKEY_OEM_MINUS},  // thorn
+    {0x0101, VKEY_OEM_8},      // a macron
+    {0x0107, VKEY_OEM_7},      // c acute
+    {0x010B, VKEY_OEM_3},      // c dot above
+    {0x0113, VKEY_W},          // e macron
+    {0x011B, VKEY_2},          // e caron
+    {0x011F, VKEY_OEM_6},      // g breve
+    {0x0121, VKEY_OEM_4},      // g dot above
+    {0x0127, VKEY_OEM_6},      // h stroke
+    {0x012B, VKEY_OEM_6},      // i macron
+    {0x0131, VKEY_OEM_1},      // dotless i
+    {0x0137, VKEY_OEM_5},      // k cedilla
+    {0x013C, VKEY_OEM_2},      // l cedilla
+    {0x013E, VKEY_2},          // l caron
+    {0x0146, VKEY_OEM_4},      // n cedilla
+    {0x0148, VKEY_OEM_5},      // n caron
+    {0x0151, VKEY_OEM_4},      // o double acute
+    {0x0159, VKEY_5},          // r caron
+    {0x0163, VKEY_OEM_7},      // t cedilla
+    {0x0165, VKEY_5},          // t caron
+    {0x016F, VKEY_OEM_1},      // u ring above
+    {0x0171, VKEY_OEM_5},      // u double acute
+    {0x01A1, VKEY_OEM_6},      // o horn
+    {0x01B0, VKEY_OEM_4},      // u horn
+    {0x01B6, VKEY_OEM_6},      // z stroke
+    {0x0259, VKEY_OEM_3},      // schwa
+};
+
 }  // anonymous namespace
 
 XkbKeyCodeConverter::XkbKeyCodeConverter() {
 }
 
 XkbKeyCodeConverter::~XkbKeyCodeConverter() {
 }
 
 XkbKeyboardLayoutEngine::XkbKeyboardLayoutEngine(
     const XkbKeyCodeConverter& converter)
@@ skipping 39 matching lines @@
 bool XkbKeyboardLayoutEngine::UsesAltGr() const {
   // NOTIMPLEMENTED();
   return false;
 }
 
 bool XkbKeyboardLayoutEngine::Lookup(DomCode dom_code,
                                      int flags,
                                      DomKey* dom_key,
                                      base::char16* character,
                                      KeyboardCode* key_code) const {
+  // Convert DOM physical key to XKB representation.
   xkb_keycode_t xkb_keycode = key_code_converter_.DomCodeToXkbKeyCode(dom_code);
   if (xkb_keycode == key_code_converter_.InvalidXkbKeyCode()) {
     LOG(ERROR) << "No XKB keycode for DomCode 0x" << std::hex
                << static_cast<int>(dom_code) << " '"
                << KeycodeConverter::DomCodeToCodeString(dom_code) << "'";
     return false;
   }
   xkb_mod_mask_t xkb_flags = EventFlagsToXkbFlags(flags);
+  // Obtain keysym and character.
   xkb_keysym_t xkb_keysym;
   if (!XkbLookup(xkb_keycode, xkb_flags, &xkb_keysym, character))
     return false;
-  *dom_key = XkbKeySymToDomKey(xkb_keysym);
+  // Classify the keysym and convert to DOM and VKEY representations.
+  *dom_key = NonPrintableXkbKeySymToDomKey(xkb_keysym);
   if (*dom_key == DomKey::NONE) {
     *dom_key = CharacterToDomKey(*character);
-    *key_code = DifficultKeyboardCode(dom_code, flags, *dom_key, *character);
+    *key_code = AlphanumericKeyboardCode(*character);
+    if (*key_code == VKEY_UNKNOWN) {
+      *key_code = DifficultKeyboardCode(dom_code, flags, xkb_keycode, xkb_flags,
+                                        xkb_keysym, *dom_key, *character);
+      if (*key_code == VKEY_UNKNOWN)
+        *key_code = DomCodeToNonLocatedKeyboardCode(dom_code);
+    }
   } else if (*dom_key == DomKey::DEAD) {
-    *character = XkbKeySymDeadKey(xkb_keysym);
-    *key_code = DomCodeToKeyboardCode(dom_code);
+    *character = DeadXkbKeySymToCombiningCharacter(xkb_keysym);
+    *key_code = DomCodeToNonLocatedKeyboardCode(dom_code);
   } else {
     *key_code = NonPrintableDomKeyToKeyboardCode(*dom_key);
     if (*key_code == VKEY_UNKNOWN)
-      *key_code = DomCodeToKeyboardCode(dom_code);
+      *key_code = DomCodeToNonLocatedKeyboardCode(dom_code);
   }
   return true;
 }
 
 void XkbKeyboardLayoutEngine::SetKeymap(xkb_keymap* keymap) {
   xkb_state_.reset(xkb_state_new(keymap));
   // Update flag map.
   static const struct {
     int ui_flag;
     const char* xkb_name;
@@ skipping 40 matching lines @@
   xkb_state_update_mask(xkb_state_.get(), xkb_flags, 0, 0, 0, 0, 0);
   *xkb_keysym = xkb_state_key_get_one_sym(xkb_state_.get(), xkb_keycode);
   if (*xkb_keysym == XKB_KEY_NoSymbol)
     return false;
   uint32_t c = xkb_state_key_get_utf32(xkb_state_.get(), xkb_keycode);
   DLOG_IF(ERROR, c != (c & 0xFFFF)) << "Non-BMP character:" << c;
   *character = static_cast<base::char16>(c);
   return true;
 }
 
+KeyboardCode XkbKeyboardLayoutEngine::DifficultKeyboardCode(
+    DomCode dom_code,
+    int ui_flags,
+    xkb_keycode_t xkb_keycode,
+    xkb_mod_mask_t xkb_flags,
+    xkb_keysym_t xkb_keysym,
+    DomKey dom_key,
+    base::char16 character) const {
+  // Get the layout interpretation without modifiers, so that
+  // e.g. Ctrl+D correctly generates VKEY_D.
+  xkb_keysym_t plain_keysym;
+  base::char16 plain_character;
+  if (!XkbLookup(xkb_keycode, 0, &plain_keysym, &plain_character))
+    return VKEY_UNKNOWN;
+
+  // If the plain key is non-printable, that determines the VKEY.
+  DomKey plain_key = NonPrintableXkbKeySymToDomKey(plain_keysym);
+  if (plain_key != ui::DomKey::NONE)
+    return NonPrintableDomKeyToKeyboardCode(dom_key);
+
+  // Plain ASCII letters and digits map directly to VKEY values.
+  KeyboardCode key_code = AlphanumericKeyboardCode(plain_character);
+  if (key_code != VKEY_UNKNOWN)
+    return key_code;
+
+  // Check the multi-character tables.
+  const PrintableMultiEntry* multi_end = kMultiMap + arraysize(kMultiMap);
+  const PrintableMultiEntry* multi =
+      std::lower_bound(kMultiMap, multi_end, plain_character,
+                       [](const PrintableMultiEntry& e, base::char16 c) {
+        return e.plain_character < c;
+      });
+  if ((multi != multi_end) && (multi->plain_character == plain_character)) {
+    const base::char16 kNonCharacter = kAny;
+    base::char16 shift_character = kNonCharacter;
+    base::char16 altgr_character = kNonCharacter;
+    for (size_t i = 0; i < multi->subtable_size; ++i) {
+      if (multi->subtable[i].dom_code != dom_code)
+        continue;
+      if (multi->subtable[i].test_shift) {
+        if (shift_character == kNonCharacter) {
+          shift_character = XkbSubCharacter(xkb_keycode, xkb_flags, character,
+                                            ui::EF_SHIFT_DOWN);
+        }
+        if (shift_character != multi->subtable[i].shift_character)
+          continue;
+      }
+      if (multi->subtable[i].test_altgr) {
+        if (altgr_character == kNonCharacter) {
+          altgr_character = XkbSubCharacter(xkb_keycode, xkb_flags, character,
+                                            ui::EF_ALTGR_DOWN);
+        }
+        if (altgr_character != multi->subtable[i].altgr_character)
+          continue;
+      }
+      return multi->subtable[i].key_code;
+    }
+  }
+
+  // Check the simple character table.
+  const PrintableSimpleEntry* simple_end = kSimpleMap + arraysize(kSimpleMap);
+  const PrintableSimpleEntry* simple =
+      std::lower_bound(kSimpleMap, simple_end, plain_character,
+                       [](const PrintableSimpleEntry& e, base::char16 c) {
+        return e.plain_character < c;
+      });
+  if ((simple != simple_end) && (simple->plain_character == plain_character))
+    return simple->key_code;
+
+  return VKEY_UNKNOWN;
+}
+
+base::char16 XkbKeyboardLayoutEngine::XkbSubCharacter(
+    xkb_keycode_t xkb_keycode,
+    xkb_mod_mask_t base_flags,
+    base::char16 base_character,
+    int ui_flags) const {
+  xkb_mod_mask_t flags = EventFlagsToXkbFlags(ui_flags);
+  if (flags == base_flags)
+    return base_character;
+  xkb_keysym_t keysym;
+  base::char16 character = 0;
+  if (!XkbLookup(xkb_keycode, flags, &keysym, &character))
+    character = kNone;
+  return character;
+}
+
 }  // namespace ui