Adding Demo to facilitate debug

Demo/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  Demo
+//
+//  Created by mi on 2024/12/1.
+//
+
+import Cocoa
+import InputController
+
+@main
+class AppDelegate: NSObject, NSApplicationDelegate {
+  func applicationDidFinishLaunching(_ aNotification: Notification) {
+    // Insert code here to initialize your application
+
+    if GlobalContext.shared.problematicLaunchDetected() {
+      print("Problematic launch detected!")
+      let args = ["Problematic launch detected! Squirrel may be suffering a crash due to improper configuration. Revert previous modifications to see if the problem recurs."]
+      let task = Process()
+      task.executableURL = "/usr/bin/say".withCString { dir in
+        URL(fileURLWithFileSystemRepresentation: dir, isDirectory: false, relativeTo: nil)
+      }
+      task.arguments = args
+      try? task.run()
+    } else {
+      GlobalContext.shared.setupRime()
+      GlobalContext.shared.startRime(fullCheck: false)
+      GlobalContext.shared.loadSettings()
+      print("Squirrel reporting!")
+    }
+  }
+
+  func applicationWillTerminate(_ aNotification: Notification) {
+    // Insert code here to tear down your application
+  }
+
+  func applicationSupportsSecureRestorableState(_ app: NSApplication) -> Bool {
+    return true
+  }
+
+
+}
+

Demo/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict/>
+</plist>

Demo/TextView+Unused.swift

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+//
+//  Unused.swift
+//  Jyutping
+//
+//  Created by mi on 2024/11/3.
+//
+
+import Cocoa
+import InputMethodKit
+
+extension Client {
+  func validAttributesForMarkedText() -> [Any]! {
+    fatalError()
+  }
+
+  func selectedRange() -> NSRange {
+    fatalError()
+  }
+
+  func markedRange() -> NSRange {
+    fatalError()
+  }
+
+  func attributedSubstring(from range: NSRange) -> NSAttributedString! {
+    fatalError()
+  }
+
+  func length() -> Int {
+    fatalError()
+  }
+
+  func characterIndex(for point: NSPoint, tracking mappingMode: IMKLocationToOffsetMappingMode, inMarkedRange: UnsafeMutablePointer<ObjCBool>!) -> Int {
+    fatalError()
+  }
+
+  func overrideKeyboard(withKeyboardNamed keyboardUniqueName: String!) {
+    fatalError()
+  }
+
+  func selectMode(_ modeIdentifier: String!) {
+    fatalError()
+  }
+
+  func supportsUnicode() -> Bool {
+    fatalError()
+  }
+
+  func supportsProperty(_ property: TSMDocumentPropertyTag) -> Bool {
+    fatalError()
+  }
+
+  func string(from range: NSRange, actualRange: NSRangePointer!) -> String! {
+    fatalError()
+  }
+
+  func firstRect(forCharacterRange aRange: NSRange, actualRange: NSRangePointer!) -> NSRect {
+    fatalError()
+  }
+
+  func windowLevel() -> CGWindowLevel {
+    fatalError()
+  }
+
+  func uniqueClientIdentifierString() -> String! {
+    fatalError()
+  }
+}

Demo/TextView.swift

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+//
+//  TextView.swift
+//  Demo
+//
+//  Created by mi on 2024/11/3.
+//
+
+import Cocoa
+import InputMethodKit
+
+extension NSTextView {
+  func currentCursorRect() -> NSRect? {
+    guard let selectedRange = self.selectedRanges.first as? NSRange else {
+      return nil
+    }
+
+    var rect = NSRect.zero
+    self.layoutManager?.enumerateEnclosingRects(
+      forGlyphRange: selectedRange,
+      withinSelectedGlyphRange: selectedRange,
+      in: self.textContainer!,
+      using: { glyphRect, _ in
+        rect = glyphRect
+      }
+    )
+
+    return self.window?.convertToScreen(self.convert(rect, to: nil))
+  }
+}
+
+class Client: NSObject, IMKTextInput {
+  weak var textView: NSTextView?
+  init(textView: NSTextView?) {
+    self.textView = textView
+  }
+
+  func bundleIdentifier() -> String! {
+    Bundle.main.bundleIdentifier
+  }
+
+  func attributes(forCharacterIndex index: Int, lineHeightRectangle lineRect: UnsafeMutablePointer<NSRect>!) -> [AnyHashable : Any]! {
+    if let rect = textView?.currentCursorRect() {
+      lineRect.pointee = rect
+    }
+    return nil
+  }
+  var replacementRange: NSRange?
+  func setMarkedText(_ string: Any!, selectionRange: NSRange, replacementRange: NSRange) {
+    guard let textView else {
+      return
+    }
+    if let length = (string as? NSAttributedString)?.length, length == 0 {
+      if let replacementRange = self.replacementRange, replacementRange.length == 1 {
+        textView.insertText("", replacementRange: replacementRange)
+      }
+      self.replacementRange = nil
+      return
+    }
+
+    guard let firstRange = textView.selectedRanges.first?.rangeValue else {
+      return
+    }
+    if self.replacementRange == nil {
+      self.replacementRange = firstRange
+    }
+    guard let replacementRange = self.replacementRange else {
+      return
+    }
+
+    textView.setMarkedText(string as Any, selectedRange: selectionRange, replacementRange: replacementRange)
+    if let string = string as? String {
+      self.replacementRange?.length = string.count
+    } else if let string = string as? NSAttributedString {
+      self.replacementRange?.length = string.length
+    }
+  }
+
+  func insertText(_ string: Any!, replacementRange: NSRange) {
+    guard let string = string as? String, let textView = textView, let replacementRange = self.replacementRange else {
+      return
+    }
+    textView.insertText(string, replacementRange: replacementRange)
+    self.replacementRange = nil
+  }
+}
+
+class TextView: NSTextView {
+  lazy var client = Client(textView: self)
+  lazy var inputController = (NSClassFromString("SquirrelInputController") as! IMKInputController.Type).init(server: nil, delegate: nil, client: client)!
+
+  override func keyDown(with event: NSEvent) {
+    if inputController.handle(event, client: client) {
+      return
+    }
+    super.keyDown(with: event)
+  }
+}

Demo/ViewController.swift

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+//
+//  ViewController.swift
+//  Demo
+//
+//  Created by mi on 2024/11/10.
+//
+
+import Cocoa
+
+class ViewController: NSViewController {
+  @IBOutlet var textView: TextView!
+
+}

InputController/InputController.h

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+//
+//  InputController.h
+//  InputController
+//
+//  Created by mi on 2024/12/1.
+//
+
+#import <Foundation/Foundation.h>
+
+//! Project version number for InputController.
+FOUNDATION_EXPORT double InputControllerVersionNumber;
+
+//! Project version string for InputController.
+FOUNDATION_EXPORT const unsigned char InputControllerVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <InputController/PublicHeader.h>
+
+#import <rime_api_stdbool.h>
+#import <rime/key_table.h>