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third_party/WebKit/Source/core/editing/foo.cpp

Index: third_party/WebKit/Source/core/editing/foo.cpp
diff --git a/third_party/WebKit/Source/core/editing/foo.cpp b/third_party/WebKit/Source/core/editing/foo.cpp
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+Foo.cpp
+/*
+ * Copyright (C) 2006, 2007 Apple, Inc.  All rights reserved.
+ * Copyright (C) 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core/editing/EditingBehavior.h"
+
+#include "core/events/KeyboardEvent.h"
+#include "platform/KeyboardCodes.h"
+#include "public/platform/WebInputEvent.h"
+
+    namespace blink {
+
+  namespace {
+
+  //
+  // The below code was adapted from the WebKit file webview.cpp
+  //
+
+  const unsigned CtrlKey = WebInputEvent::ControlKey;
+  const unsigned AltKey = WebInputEvent::AltKey;
+  const unsigned ShiftKey = WebInputEvent::ShiftKey;
+  const unsigned MetaKey = WebInputEvent::MetaKey;
+#if OS(MACOSX)
+  // Aliases for the generic key defintions to make kbd shortcuts definitions
+  // more
+  // readable on OS X.
+  const unsigned OptionKey = AltKey;
+
+  // Do not use this constant for anything but cursor movement commands. Keys
+  // with cmd set have their |isSystemKey| bit set, so chances are the shortcut
+  // will not be executed. Another, less important, reason is that shortcuts
+  // defined in the layoutObject do not blink the menu item that they triggered.
+  // See http://crbug.com/25856 and the bugs linked from there for details.
+  const unsigned CommandKey = MetaKey;
+#endif
+
+  // Keys with special meaning. These will be delegated to the editor using
+  // the execCommand() method
+  struct KeyboardCodeKeyDownEntry {
+    unsigned virtualKey;
+    unsigned modifiers;
+    const char* name;
+  };
+
+  struct KeyboardCodeKeyPressEntry {
+    unsigned charCode;
+    unsigned modifiers;
+    const char* name;
+  };
+
+  // DomKey has a broader range than KeyboardCode, we need DomKey to handle some
+  // special keys.
+  // Note: We cannot use DomKey for printable keys since it may vary based on
+  // locale.
+  struct DomKeyKeyDownEntry {
+    const char* key;
+    unsigned modifiers;
+    const char* name;
+  };
+
+  // Key bindings with command key on Mac and alt key on other platforms are
+  // marked as system key events and will be ignored (with the exception
+  // of Command-B and Command-I) so they shouldn't be added here.
+  const KeyboardCodeKeyDownEntry kKeyboardCodeKeyDownEntries[] = {
+    {VKEY_LEFT, 0, "MoveLeft"},
+    {VKEY_LEFT, ShiftKey, "MoveLeftAndModifySelection"},
+#if OS(MACOSX)
+    {VKEY_LEFT, OptionKey, "MoveWordLeft"},
+    {VKEY_LEFT, OptionKey | ShiftKey, "MoveWordLeftAndModifySelection"},
+#else
+    {VKEY_LEFT, CtrlKey, "MoveWordLeft"},
+    {VKEY_LEFT, CtrlKey | ShiftKey, "MoveWordLeftAndModifySelection"},
+#endif
+    {VKEY_RIGHT, 0, "MoveRight"},
+    {VKEY_RIGHT, ShiftKey, "MoveRightAndModifySelection"},
+#if OS(MACOSX)
+    {VKEY_RIGHT, OptionKey, "MoveWordRight"},
+    {VKEY_RIGHT, OptionKey | ShiftKey, "MoveWordRightAndModifySelection"},
+#else
+    {VKEY_RIGHT, CtrlKey, "MoveWordRight"},
+    {VKEY_RIGHT, CtrlKey | ShiftKey, "MoveWordRightAndModifySelection"},
+#endif
+    {VKEY_UP, 0, "MoveUp"},
+    {VKEY_UP, ShiftKey, "MoveUpAndModifySelection"},
+    {VKEY_PRIOR, ShiftKey, "MovePageUpAndModifySelection"},
+    {VKEY_DOWN, 0, "MoveDown"},
+    {VKEY_DOWN, ShiftKey, "MoveDownAndModifySelection"},
+    {VKEY_NEXT, ShiftKey, "MovePageDownAndModifySelection"},
+#if !OS(MACOSX)
+    {VKEY_UP, CtrlKey, "MoveParagraphBackward"},
+    {VKEY_UP, CtrlKey | ShiftKey, "MoveParagraphBackwardAndModifySelection"},
+    {VKEY_DOWN, CtrlKey, "MoveParagraphForward"},
+    {VKEY_DOWN, CtrlKey | ShiftKey, "MoveParagraphForwardAndModifySelection"},
+    {VKEY_PRIOR, 0, "MovePageUp"},
+    {VKEY_NEXT, 0, "MovePageDown"},
+#endif
+    {VKEY_HOME, 0, "MoveToBeginningOfLine"},
+    {VKEY_HOME, ShiftKey, "MoveToBeginningOfLineAndModifySelection"},
+#if OS(MACOSX)
+    {VKEY_PRIOR, OptionKey, "MovePageUp"},
+    {VKEY_NEXT, OptionKey, "MovePageDown"},
+#endif
+#if !OS(MACOSX)
+    {VKEY_HOME, CtrlKey, "MoveToBeginningOfDocument"},
+    {VKEY_HOME, CtrlKey | ShiftKey,
+     "MoveToBeginningOfDocumentAndModifySelection"},
+#endif
+    {VKEY_END, 0, "MoveToEndOfLine"},
+    {VKEY_END, ShiftKey, "MoveToEndOfLineAndModifySelection"},
+#if !OS(MACOSX)
+    {VKEY_END, CtrlKey, "MoveToEndOfDocument"},
+    {VKEY_END, CtrlKey | ShiftKey, "MoveToEndOfDocumentAndModifySelection"},
+#endif
+    {VKEY_BACK, 0, "DeleteBackward"},
+    {VKEY_BACK, ShiftKey, "DeleteBackward"},
+    {VKEY_DELETE, 0, "DeleteForward"},
+#if OS(MACOSX)
+    {VKEY_BACK, OptionKey, "DeleteWordBackward"},
+    {VKEY_DELETE, OptionKey, "DeleteWordForward"},
+#else
+    {VKEY_BACK, CtrlKey, "DeleteWordBackward"},
+    {VKEY_DELETE, CtrlKey, "DeleteWordForward"},
+#endif
+#if OS(MACOSX)
+    {'B', CommandKey, "ToggleBold"},
+    {'I', CommandKey, "ToggleItalic"},
+#else
+    {'B', CtrlKey, "ToggleBold"},
+    {'I', CtrlKey, "ToggleItalic"},
+#endif
+    {'U', CtrlKey, "ToggleUnderline"},
+    {VKEY_ESCAPE, 0, "Cancel"},
+    {VKEY_OEM_PERIOD, CtrlKey, "Cancel"},
+    {VKEY_TAB, 0, "InsertTab"},
+    {VKEY_TAB, ShiftKey, "InsertBacktab"},
+    {VKEY_RETURN, 0, "InsertNewline"},
+    {VKEY_RETURN, CtrlKey, "InsertNewline"},
+    {VKEY_RETURN, AltKey, "InsertNewline"},
+    {VKEY_RETURN, AltKey | ShiftKey, "InsertNewline"},
+    {VKEY_RETURN, ShiftKey, "InsertLineBreak"},
+    {VKEY_INSERT, CtrlKey, "Copy"},
+    {VKEY_INSERT, ShiftKey, "Paste"},
+    {VKEY_DELETE, ShiftKey, "Cut"},
+#if !OS(MACOSX)
+    // On OS X, we pipe these back to the browser, so that it can do menu item
+    // blinking.
+    {'C', CtrlKey, "Copy"},
+    {'V', CtrlKey, "Paste"},
+    {'V', CtrlKey | ShiftKey, "PasteAndMatchStyle"},
+    {'X', CtrlKey, "Cut"},
+    {'A', CtrlKey, "SelectAll"},
+    {'Z', CtrlKey, "Undo"},
+    {'Z', CtrlKey | ShiftKey, "Redo"},
+    {'Y', CtrlKey, "Redo"},
+#endif
+    {VKEY_INSERT, 0, "OverWrite"},
+  };
+
+  const KeyboardCodeKeyPressEntry kKeyboardCodeKeyPressEntries[] = {
+      {'\t', 0, "InsertTab"},
+      {'\t', ShiftKey, "InsertBacktab"},
+      {'\r', 0, "InsertNewline"},
+      {'\r', ShiftKey, "InsertLineBreak"},
+  };
+
+  const DomKeyKeyDownEntry kDomKeyKeyDownEntries[] = {
+      {"Copy", 0, "Copy"},
+      {"Cut", 0, "Cut"},
+      {"Paste", 0, "Paste"},
+  };
+
+  const char* lookupCommandNameFromDomKeyKeyDown(const String& key,
+                                                 unsigned modifiers) {
+    // This table is not likely to grow, so sequential search is fine here.
+    for (const auto& entry : kDomKeyKeyDownEntries) {
+      if (key == entry.key && modifiers == entry.modifiers)
+        return entry.name;
+    }
+    return nullptr;
+  }
+
+  }  // anonymous namespace
+
+  const char* EditingBehavior::interpretKeyEvent(const KeyboardEvent& event)
+      const {
+    const WebKeyboardEvent* keyEvent = event.keyEvent();
+    if (!keyEvent)
+      return "";
+
+    static HashMap<int, const char*>* keyDownCommandsMap = nullptr;
+    static HashMap<int, const char*>* keyPressCommandsMap = nullptr;
+
+    if (!keyDownCommandsMap) {
+      keyDownCommandsMap = new HashMap<int, const char*>;
+      keyPressCommandsMap = new HashMap<int, const char*>;
+
+      for (const auto& entry : kKeyboardCodeKeyDownEntries) {
+        keyDownCommandsMap->set(entry.modifiers << 16 | entry.virtualKey,
+                                entry.name);
+      }
+
+      for (const auto& entry : kKeyboardCodeKeyPressEntries) {
+        keyPressCommandsMap->set(entry.modifiers << 16 | entry.charCode,
+                                 entry.name);
+      }
+    }
+
+    unsigned modifiers =
+        keyEvent->modifiers() & (ShiftKey | AltKey | CtrlKey | MetaKey);
+
+    if (keyEvent->type() == WebInputEvent::RawKeyDown) {
+      int mapKey = modifiers << 16 | event.keyCode();
+      const char* name = mapKey ? keyDownCommandsMap->get(mapKey) : nullptr;
+      if (!name)
+        name = lookupCommandNameFromDomKeyKeyDown(event.key(), modifiers);
+      return name;
+    }
+
+    int mapKey = modifiers << 16 | event.charCode();
+    return mapKey ? keyPressCommandsMap->get(mapKey) : 0;
+  }
+
+  bool EditingBehavior::shouldInsertCharacter(const KeyboardEvent& event)
+      const {
+    if (event.keyEvent()->text[1] != 0)
+      return true;
+
+    // On Gtk/Linux, it emits key events with ASCII text and ctrl on for
+    // ctrl-<x>.
+    // In Webkit, EditorClient::handleKeyboardEvent in
+    // WebKit/gtk/WebCoreSupport/EditorClientGtk.cpp drop such events.
+    // On Mac, it emits key events with ASCII text and meta on for Command-<x>.
+    // These key events should not emit text insert event.
+    // Alt key would be used to insert alternative character, so we should let
+    // through. Also note that Ctrl-Alt combination equals to AltGr key which is
+    // also used to insert alternative character.
+    // http://code.google.com/p/chromium/issues/detail?id=10846
+    // Windows sets both alt and meta are on when "Alt" key pressed.
+    // http://code.google.com/p/chromium/issues/detail?id=2215
+    // Also, we should not rely on an assumption that keyboards don't
+    // send ASCII characters when pressing a control key on Windows,
+    // which may be configured to do it so by user.
+    // See also http://en.wikipedia.org/wiki/Keyboard_Layout
+    // FIXME(ukai): investigate more detail for various keyboard layout.
+    UChar ch = event.keyEvent()->text[0U];
+
+    // Don't insert null or control characters as they can result in
+    // unexpected behaviour
+    if (ch < ' ')
+      return false;
+#if OS(LINUX)
+    // According to XKB map no keyboard combinations with ctrl key are mapped to
+    // printable characters, however we need the filter as the DomKey/text could
+    // contain printable characters.
+    if (event.ctrlKey())
+      return false;
+#elif !OS(WIN)
+    // Don't insert ASCII character if ctrl w/o alt or meta is on.
+    // On Mac, we should ignore events when meta is on (Command-<x>).
+    if (ch < 0x80) {
+      if (event.ctrlKey() && !event.altKey())
+        return false;
+#if OS(MACOSX)
+      if (event.metaKey())
+        return false;
+#endif
+    }
+#endif
+
+    return true;
+  }
+}  // namespace blink