[InputEvent] Support |sequence<Range> getRanges()| in 'beforeinput'

third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp

Index: third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
diff --git a/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp b/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
index b71feb92c5b60592b4d1e5bfc5213c18b86823e2..e6443c6815948dfc829ce9eebe795b5f732d069b 100644
--- a/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
+++ b/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
@@ -131,6 +131,19 @@ InputEvent::InputType InputTypeFromCommandType(WebEditingCommandType commandType
     }
 }
 
+HeapVector<Member<Range>> RangesFromCurrentSelectionOrExtendCaret(const VisibleSelection& currentSelection, SelectionDirection direction, TextGranularity granularity)
+{
+    FrameSelection* selection = FrameSelection::create();
+    selection->setSelection(currentSelection);
+    if (selection->isCaret())
+        selection->modify(FrameSelection::AlterationExtend, direction, granularity);
+    HeapVector<Member<Range>> ranges;
+    // We only supports single selections.
+    if (!selection->isNone())
+        ranges.append(selection->firstRange());
+    return ranges;
+}
+
 } // anonymous namespace
 
 class EditorInternalCommand {
@@ -1782,7 +1795,7 @@ bool Editor::Command::execute(const String& parameter, Event* triggeringEvent) c
     if (m_source == CommandFromMenuOrKeyBinding) {
         InputEvent::InputType inputType = InputTypeFromCommandType(m_command->commandType);
         if (inputType != InputEvent::InputType::None) {
-            if (dispatchBeforeInputEditorCommand(eventTargetNodeForDocument(m_frame->document()), inputType) != DispatchEventResult::NotCanceled)
+            if (dispatchBeforeInputEditorCommand(eventTargetNodeForDocument(m_frame->document()), inputType, emptyString(), getRanges()) != DispatchEventResult::NotCanceled)
                 return true;
         }
     }
@@ -1849,4 +1862,34 @@ int Editor::Command::idForHistogram() const
     return isSupported() ? static_cast<int>(m_command->commandType) : 0;
 }
 
+HeapVector<Member<Range>> Editor::Command::getRanges() const
+{
+    DEFINE_STATIC_LOCAL(HeapVector<Member<Range>>, emptyVector, (new HeapVector<Member<Range>>));
+
+    if (!isSupported() || !m_frame)
+        return emptyVector;
+
+    switch (m_command->commandType) {
+    case WebEditingCommandType::Delete:
+    case WebEditingCommandType::DeleteBackward:
+        return RangesFromCurrentSelectionOrExtendCaret(frame().selection().selection(), DirectionBackward, CharacterGranularity);
+    case WebEditingCommandType::DeleteForward:
+        return RangesFromCurrentSelectionOrExtendCaret(frame().selection().selection(), DirectionForward, CharacterGranularity);
+    case WebEditingCommandType::DeleteToBeginningOfLine:
+        return RangesFromCurrentSelectionOrExtendCaret(frame().selection().selection(), DirectionBackward, LineGranularity);
+    case WebEditingCommandType::DeleteToBeginningOfParagraph:
+        return RangesFromCurrentSelectionOrExtendCaret(frame().selection().selection(), DirectionBackward, ParagraphGranularity);
+    case WebEditingCommandType::DeleteToEndOfLine:
+        return RangesFromCurrentSelectionOrExtendCaret(frame().selection().selection(), DirectionForward, LineGranularity);
+    case WebEditingCommandType::DeleteToEndOfParagraph:
+        return RangesFromCurrentSelectionOrExtendCaret(frame().selection().selection(), DirectionForward, ParagraphGranularity);
+    case WebEditingCommandType::DeleteWordBackward:
+        return RangesFromCurrentSelectionOrExtendCaret(frame().selection().selection(), DirectionBackward, WordGranularity);
+    case WebEditingCommandType::DeleteWordForward:
+        return RangesFromCurrentSelectionOrExtendCaret(frame().selection().selection(), DirectionForward, WordGranularity);
+    default:
+        return emptyVector;
+    }
+}
+
 } // namespace blink