Introduce ForwardGraphemeBoundaryStateMachine

third_party/WebKit/Source/core/editing/state_machines/ForwardGraphemeBoundaryStateMachine.h

Index: third_party/WebKit/Source/core/editing/state_machines/ForwardGraphemeBoundaryStateMachine.h
diff --git a/third_party/WebKit/Source/core/editing/state_machines/BackwardGraphemeBoundaryStateMachine.h b/third_party/WebKit/Source/core/editing/state_machines/ForwardGraphemeBoundaryStateMachine.h
similarity index 75%
copy from third_party/WebKit/Source/core/editing/state_machines/BackwardGraphemeBoundaryStateMachine.h
copy to third_party/WebKit/Source/core/editing/state_machines/ForwardGraphemeBoundaryStateMachine.h
index 7db5c0d50573b3304ddb7194a08eb70bdff049d9..d330e10c0fe351d14b0a6c4047884cb38f94d4dd 100644
--- a/third_party/WebKit/Source/core/editing/state_machines/BackwardGraphemeBoundaryStateMachine.h
+++ b/third_party/WebKit/Source/core/editing/state_machines/ForwardGraphemeBoundaryStateMachine.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef BackwardGraphemeBoundaryStateMachine_h
-#define BackwardGraphemeBoundaryStateMachine_h
+#ifndef ForwardGraphemeBoundaryStateMachine_h
+#define ForwardGraphemeBoundaryStateMachine_h
 
 #include "core/CoreExport.h"
 #include "core/editing/state_machines/TextSegmentationMachineState.h"
@@ -14,12 +14,12 @@
 
 namespace blink {
 
-class CORE_EXPORT BackwardGraphemeBoundaryStateMachine {
+class CORE_EXPORT ForwardGraphemeBoundaryStateMachine {
     STACK_ALLOCATED();
-    WTF_MAKE_NONCOPYABLE(BackwardGraphemeBoundaryStateMachine);
+    WTF_MAKE_NONCOPYABLE(ForwardGraphemeBoundaryStateMachine);
 
 public:
-    BackwardGraphemeBoundaryStateMachine();
+    ForwardGraphemeBoundaryStateMachine();
 
     // Find boundary offset by feeding preceding text.
     // This method must not be called after feedFollowingCodeUnit().
@@ -44,19 +44,22 @@ private:
     enum class InternalState;
     friend std::ostream& operator<<(std::ostream&, InternalState);
 
-    TextSegmentationMachineState moveToNextState(InternalState nextState);
+    TextSegmentationMachineState moveToNextState(InternalState);
 
     TextSegmentationMachineState staySameState();
 
-    // Updates the internal state to InternalState::Finished then returns
-    // TextSegmentationMachineState::Finished.
+    // Updates the internal state to InternalState::Finished then
+    // returnsTextSegmentationMachineState::Finished.
     TextSegmentationMachineState finish();
 
+    // Handles end of text. This method always finishes the state machine.
+    void finishWithEndOfText();
+
     // Used for composing supplementary code point with surrogate pairs.
-    UChar m_trailSurrogate = 0;
+    UChar m_pendingCodeUnit = 0;
 
-    // The code point immediately after the m_BoundaryOffset.
-    UChar32 m_nextCodePoint = 0;
+    // The code point immediately before the m_BoundaryOffset.
+    UChar32 m_prevCodePoint = 0;
 
     // The relative offset from the begging of this state machine.
     int m_boundaryOffset = 0;