Move state machines to state_machines subdir

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

 // Copyright 2016 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 "core/editing/BackspaceStateMachine.h"
 
 #include "wtf/text/Unicode.h"
 
 namespace blink {
 
-int BackspaceStateMachine::finalizeAndGetCodeUnitCountToBeDeleted()
-{
-    if (m_trailSurrogate != 0) {
-        // Unpaired trail surrogate. Removing broken surrogate.
-        ++m_codeUnitsToBeDeleted;
-        m_trailSurrogate = 0;
-    }
-    return m_codeUnitsToBeDeleted;
-}
-
-bool BackspaceStateMachine::updateState(UChar codeUnit)
+BackspaceStateMachine::State BackspaceStateMachine::feedPrecedingCodeUnit(UChar codeUnit)
 {
     uint32_t codePoint = codeUnit;
     if (U16_IS_LEAD(codeUnit)) {
         if (m_trailSurrogate == 0) {
             // Unpaired lead surrogate. Aborting with deleting broken surrogate.
             ++m_codeUnitsToBeDeleted;
-            return true;
+            return State::Finished;
         }
         codePoint = U16_GET_SUPPLEMENTARY(codeUnit, m_trailSurrogate);
         m_trailSurrogate = 0;
     } else if (U16_IS_TRAIL(codeUnit)) {
         if (m_trailSurrogate != 0) {
             // Unpaired trail surrogate. Aborting with deleting broken
             // surrogate.
-            return true;
+            return State::Finished;
         }
         m_trailSurrogate = codeUnit;
-        return false; // Needs surrogate lead.
+        return State::NeedMoreCodeUnit;
     } else {
         if (m_trailSurrogate != 0) {
             // Unpaired trail surrogate. Aborting with deleting broken
             // surrogate.
-            return true;
+            return State::Finished;
         }
     }
 
     // TODO(nona): Handle emoji sequences.
     m_codeUnitsToBeDeleted = U16_LENGTH(codePoint);
-    return true;
+    return State::Finished;
+}
+
+BackspaceStateMachine::State BackspaceStateMachine::notifyEndOfPrecedingText()
+{
+    if (m_trailSurrogate != 0) {
+        // Unpaired trail surrogate. Removing broken surrogate.
+        ++m_codeUnitsToBeDeleted;
+        m_trailSurrogate = 0;
+    }
+    return State::Finished;
+}
+
+BackspaceStateMachine::State BackspaceStateMachine::feedFollowingCodeUnit(UChar codeUnit)
+{
+    NOTREACHED();
+    return State::Unknown;

[yosin_UTC9, 2016/03/30 07:43:06]

|Invalid| is better for here? Because state machine moves into unexpected state
rather than unknown state.

[Seigo Nonaka, 2016/03/30 08:13:09]

Done.

+}
+
+int BackspaceStateMachine::finalizeAndGetBoundaryOffset()
+{
+    if (m_trailSurrogate != 0) {
+        // Unpaired trail surrogate. Removing broken surrogate.
+        ++m_codeUnitsToBeDeleted;
+        m_trailSurrogate = 0;
+    }
+    return -m_codeUnitsToBeDeleted;
 }
 
 void BackspaceStateMachine::reset()
 {
     m_codeUnitsToBeDeleted = 0;
     m_trailSurrogate = 0;
 }
 
 } // namespace blink