diff --git a/Source/Modules/ControllerModules/InputSignal.swift b/Source/Modules/ControllerModules/InputSignal.swift
index a6f6a423..fa4e2d2c 100644
--- a/Source/Modules/ControllerModules/InputSignal.swift
+++ b/Source/Modules/ControllerModules/InputSignal.swift
@@ -134,17 +134,15 @@ struct InputSignal: CustomStringConvertible {
   private var extraChooseCandidateKeyReverse: KeyCode = .kNone
   private var absorbedArrowKey: KeyCode = .kNone
   private var verticalTypingOnlyChooseCandidateKey: KeyCode = .kNone
-  private(set) var emacsKey: vChewingEmacsKey
+  private(set) var emacsKey: EmacsKey
 
   public init(
     inputText: String?, keyCode: UInt16, charCode: UInt16, flags: NSEvent.ModifierFlags,
     isVerticalTyping: Bool, inputTextIgnoringModifiers: String? = nil
   ) {
-    let inputText = AppleKeyboardConverter.cnvStringApple2ABC(inputText ?? "")
-    let inputTextIgnoringModifiers = AppleKeyboardConverter.cnvStringApple2ABC(
-      inputTextIgnoringModifiers ?? inputText)
-    self.inputText = inputText
-    self.inputTextIgnoringModifiers = inputTextIgnoringModifiers
+    self.inputText = AppleKeyboardConverter.cnvStringApple2ABC(inputText ?? "")
+    self.inputTextIgnoringModifiers = AppleKeyboardConverter.cnvStringApple2ABC(
+      inputTextIgnoringModifiers ?? inputText ?? "")
     self.flags = flags
     isFlagChanged = false
     isTypingVertical = isVerticalTyping
@@ -163,7 +161,7 @@ struct InputSignal: CustomStringConvertible {
       event.charactersIgnoringModifiers ?? "")
     keyCode = event.keyCode
     flags = event.modifierFlags
-    isFlagChanged = (event.type == .flagsChanged) ? true : false
+    isFlagChanged = (event.type == .flagsChanged)
     isTypingVertical = isVerticalTyping
     let charCode: UInt16 = {
       // 這裡不用「count > 0」，因為該整數變數只要「!isEmpty」那就必定滿足這個條件。
@@ -230,14 +228,14 @@ struct InputSignal: CustomStringConvertible {
     flags.contains([.control]) && inputText?.first?.isLetter ?? false
   }
 
-  var isOptionHotKey: Bool {
-    flags.contains([.option]) && inputText?.first?.isLetter ?? false
-  }
-
   var isOptionHold: Bool {
     flags.contains([.option])
   }
 
+  var isOptionHotKey: Bool {
+    flags.contains([.option]) && inputText?.first?.isLetter ?? false
+  }
+
   var isCapsLockOn: Bool {
     flags.contains([.capsLock])
   }
@@ -334,7 +332,7 @@ struct InputSignal: CustomStringConvertible {
     KeyCode(rawValue: keyCode) == extraChooseCandidateKeyReverse
   }
 
-  var isverticalTypingOnlyChooseCandidateKey: Bool {
+  var isVerticalTypingOnlyChooseCandidateKey: Bool {
     KeyCode(rawValue: keyCode) == verticalTypingOnlyChooseCandidateKey
   }
 
@@ -350,7 +348,7 @@ struct InputSignal: CustomStringConvertible {
   }
 }
 
-enum vChewingEmacsKey: UInt16 {
+enum EmacsKey: UInt16 {
   case none = 0
   case forward = 6  // F
   case backward = 2  // B
@@ -361,10 +359,10 @@ enum vChewingEmacsKey: UInt16 {
 }
 
 enum EmacsKeyHelper {
-  static func detect(charCode: UniChar, flags: NSEvent.ModifierFlags) -> vChewingEmacsKey {
+  static func detect(charCode: UniChar, flags: NSEvent.ModifierFlags) -> EmacsKey {
     let charCode = AppleKeyboardConverter.cnvApple2ABC(charCode)
     if flags.contains(.control) {
-      return vChewingEmacsKey(rawValue: charCode) ?? .none
+      return EmacsKey(rawValue: charCode) ?? .none
     }
     return .none
   }
diff --git a/Source/Modules/ControllerModules/KeyHandler_HandleCandidate.swift b/Source/Modules/ControllerModules/KeyHandler_HandleCandidate.swift
index 1f8462fb..a861c828 100644
--- a/Source/Modules/ControllerModules/KeyHandler_HandleCandidate.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_HandleCandidate.swift
@@ -122,7 +122,7 @@ extension KeyHandler {
 
     // MARK: PgDn
 
-    if input.isPageDown || input.emacsKey == vChewingEmacsKey.nextPage {
+    if input.isPageDown || input.emacsKey == EmacsKey.nextPage {
       let updated: Bool = ctlCandidateCurrent.showNextPage()
       if !updated {
         IME.prtDebugIntel("9B691919")
@@ -166,7 +166,7 @@ extension KeyHandler {
 
     // MARK: EmacsKey Backward
 
-    if input.emacsKey == vChewingEmacsKey.backward {
+    if input.emacsKey == EmacsKey.backward {
       let updated: Bool = ctlCandidateCurrent.highlightPreviousCandidate()
       if !updated {
         IME.prtDebugIntel("9B89308D")
@@ -199,7 +199,7 @@ extension KeyHandler {
 
     // MARK: EmacsKey Forward
 
-    if input.emacsKey == vChewingEmacsKey.forward {
+    if input.emacsKey == EmacsKey.forward {
       let updated: Bool = ctlCandidateCurrent.highlightNextCandidate()
       if !updated {
         IME.prtDebugIntel("9B2428D")
@@ -254,7 +254,7 @@ extension KeyHandler {
 
     // MARK: Home Key
 
-    if input.isHome || input.emacsKey == vChewingEmacsKey.home {
+    if input.isHome || input.emacsKey == EmacsKey.home {
       if ctlCandidateCurrent.selectedCandidateIndex == 0 {
         IME.prtDebugIntel("9B6EDE8D")
         errorCallback()
@@ -278,7 +278,7 @@ extension KeyHandler {
     if candidates.isEmpty {
       return false
     } else {  // 這裡不用「count > 0」，因為該整數變數只要「!isEmpty」那就必定滿足這個條件。
-      if input.isEnd || input.emacsKey == vChewingEmacsKey.end {
+      if input.isEnd || input.emacsKey == EmacsKey.end {
         if ctlCandidateCurrent.selectedCandidateIndex == candidates.count - 1 {
           IME.prtDebugIntel("9B69AAAD")
           errorCallback()
diff --git a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
index e42fa70a..7b50f233 100644
--- a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
@@ -257,7 +257,7 @@ extension KeyHandler {
     if let currentState = state as? InputState.NotEmpty, composer.isEmpty,
       input.isExtraChooseCandidateKey || input.isExtraChooseCandidateKeyReverse || input.isSpace
         || input.isPageDown || input.isPageUp || (input.isTab && mgrPrefs.specifyShiftTabKeyBehavior)
-        || (input.isTypingVertical && (input.isverticalTypingOnlyChooseCandidateKey))
+        || (input.isTypingVertical && (input.isVerticalTypingOnlyChooseCandidateKey))
     {
       if input.isSpace {
         /// 倘若沒有在偏好設定內將 Space 空格鍵設為選字窗呼叫用鍵的話………
@@ -305,7 +305,7 @@ extension KeyHandler {
 
     // MARK: Cursor backward
 
-    if input.isCursorBackward || input.emacsKey == vChewingEmacsKey.backward {
+    if input.isCursorBackward || input.emacsKey == EmacsKey.backward {
       return handleBackward(
         state: state,
         input: input,
@@ -316,7 +316,7 @@ extension KeyHandler {
 
     // MARK: Cursor forward
 
-    if input.isCursorForward || input.emacsKey == vChewingEmacsKey.forward {
+    if input.isCursorForward || input.emacsKey == EmacsKey.forward {
       return handleForward(
         state: state, input: input, stateCallback: stateCallback, errorCallback: errorCallback
       )
@@ -324,13 +324,13 @@ extension KeyHandler {
 
     // MARK: Home
 
-    if input.isHome || input.emacsKey == vChewingEmacsKey.home {
+    if input.isHome || input.emacsKey == EmacsKey.home {
       return handleHome(state: state, stateCallback: stateCallback, errorCallback: errorCallback)
     }
 
     // MARK: End
 
-    if input.isEnd || input.emacsKey == vChewingEmacsKey.end {
+    if input.isEnd || input.emacsKey == EmacsKey.end {
       return handleEnd(state: state, stateCallback: stateCallback, errorCallback: errorCallback)
     }
 
@@ -360,7 +360,7 @@ extension KeyHandler {
 
     // MARK: Delete
 
-    if input.isDelete || input.emacsKey == vChewingEmacsKey.delete {
+    if input.isDelete || input.emacsKey == EmacsKey.delete {
       return handleDelete(state: state, stateCallback: stateCallback, errorCallback: errorCallback)
     }
 
diff --git a/Source/Modules/ControllerModules/KeyHandler_States.swift b/Source/Modules/ControllerModules/KeyHandler_States.swift
index 82b76b1d..2dbd3926 100644
--- a/Source/Modules/ControllerModules/KeyHandler_States.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_States.swift
@@ -233,7 +233,7 @@ extension KeyHandler {
     }
 
     // Shift + Left
-    if input.isCursorBackward || input.emacsKey == vChewingEmacsKey.backward, input.isShiftHold {
+    if input.isCursorBackward || input.emacsKey == EmacsKey.backward, input.isShiftHold {
       var index = state.markerIndex
       if index > 0 {
         index = state.composingBuffer.utf16PreviousPosition(for: index)
@@ -254,7 +254,7 @@ extension KeyHandler {
     }
 
     // Shift + Right
-    if input.isCursorForward || input.emacsKey == vChewingEmacsKey.forward, input.isShiftHold {
+    if input.isCursorForward || input.emacsKey == EmacsKey.forward, input.isShiftHold {
       var index = state.markerIndex
       if index < (state.composingBuffer.utf16.count) {
         index = state.composingBuffer.utf16NextPosition(for: index)