From e6e99c52052ce40ef73597fa06a9c545410105cf Mon Sep 17 00:00:00 2001
From: ShikiSuen <shikisuen@outlook.com>
Date: Fri, 24 Feb 2023 13:29:51 +0800
Subject: [PATCH] InputHandler // Implement Alt+BkSp features.

---
 Source/Modules/InputHandler_HandleStates.swift | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/Source/Modules/InputHandler_HandleStates.swift b/Source/Modules/InputHandler_HandleStates.swift
index b5fc3a9d..387e24bb 100644
--- a/Source/Modules/InputHandler_HandleStates.swift
+++ b/Source/Modules/InputHandler_HandleStates.swift
@@ -401,12 +401,21 @@ extension InputHandler {
 
     if isCodePointInputMode {
       if !strCodePointBuffer.isEmpty {
-        strCodePointBuffer = strCodePointBuffer.dropLast(1).description
-        if !strCodePointBuffer.isEmpty {
+        func refreshState() {
           var updatedState = generateStateOfInputting()
           updatedState.tooltipDuration = 0
           updatedState.tooltip = tooltipCodePointInputMode
           delegate.switchState(updatedState)
+        }
+        strCodePointBuffer = strCodePointBuffer.dropLast(1).description
+        if input.modifierFlags == .option {
+          strCodePointBuffer.removeAll()
+          refreshState()
+          isCodePointInputMode = true
+          return true
+        }
+        if !strCodePointBuffer.isEmpty {
+          refreshState()
           return true
         }
       }
@@ -460,7 +469,9 @@ extension InputHandler {
       }
       walk()
     } else {
-      letComposerAndCalligrapherDoBackSpace()
+      _ = input.modifierFlags == .option
+        ? clearComposerAndCalligrapher()
+        : letComposerAndCalligrapherDoBackSpace()
     }
 
     switch isConsideredEmptyForNow {