cocoa-cb: remove all force unwrappings of optionals

the force unwrapping of optionals caused many unpredictable segfaults
instead of gracefully exiting or falling back. besides that, it is bad
practice and the code is a lot more stable now.

1 files changed, 21 insertions, 19 deletions

diff --git a/video/out/cocoa-cb/events_view.swift b/video/out/cocoa-cb/events_view.swift
index b9de12ca26..9c30e32ca0 100644
--- a/video/out/cocoa-cb/events_view.swift
+++ b/video/out/cocoa-cb/events_view.swift
@@ -20,9 +20,7 @@ import Cocoa
 class EventsView: NSView {
 
     weak var cocoaCB: CocoaCB!
-    var mpv: MPVHelper! {
-        get { return cocoaCB == nil ? nil : cocoaCB.mpv }
-    }
+    var mpv: MPVHelper { get { return cocoaCB.mpv } }
 
     var tracker: NSTrackingArea?
     var hasMouseDown: Bool = false
@@ -46,13 +44,14 @@ class EventsView: NSView {
     }
 
     override func updateTrackingAreas() {
-        if tracker != nil {
-            removeTrackingArea(tracker!)
+        if let tracker = self.tracker {
+            removeTrackingArea(tracker)
         }
 
         tracker = NSTrackingArea(rect: bounds,
             options: [.activeAlways, .mouseEnteredAndExited, .mouseMoved, .enabledDuringMouseDrag],
             owner: self, userInfo: nil)
+        // here tracker is guaranteed to be none-nil
         addTrackingArea(tracker!)
 
         if containsMouseLocation() {
@@ -72,6 +71,7 @@ class EventsView: NSView {
     }
 
     func isURL(_ str: String) -> Bool {
+        // force unwrapping is fine here, regex is guarnteed to be valid
         let regex = try! NSRegularExpression(pattern: "^(https?|ftp)://[^\\s/$.?#].[^\\s]*$",
                                              options: .caseInsensitive)
         let isURL = regex.numberOfMatches(in: str,
@@ -135,14 +135,14 @@ class EventsView: NSView {
         if mpv.getBoolProperty("input-cursor") {
             cocoa_put_key_with_modifiers(SWIFT_KEY_MOUSE_LEAVE, 0)
         }
-        cocoaCB.titleBar.hide()
+        cocoaCB.titleBar?.hide()
     }
 
     override func mouseMoved(with event: NSEvent) {
-        if mpv != nil && mpv.getBoolProperty("input-cursor") {
+        if mpv.getBoolProperty("input-cursor") {
             signalMouseMovement(event)
         }
-        cocoaCB.titleBar.show()
+        cocoaCB.titleBar?.show()
     }
 
     override func mouseDragged(with event: NSEvent) {
@@ -161,7 +161,7 @@ class EventsView: NSView {
         if mpv.getBoolProperty("input-cursor") {
             signalMouseUp(event)
         }
-        cocoaCB.window.isMoving = false
+        cocoaCB.window?.isMoving = false
     }
 
     override func rightMouseDown(with event: NSEvent) {
@@ -210,8 +210,8 @@ class EventsView: NSView {
         point = convertToBacking(point)
         point.y = -point.y
 
-        cocoaCB.window.updateMovableBackground(point)
-        if !cocoaCB.window.isMoving {
+        cocoaCB.window?.updateMovableBackground(point)
+        if !(cocoaCB.window?.isMoving ?? false) {
             mpv.setMousePosition(point)
         }
     }
@@ -257,21 +257,23 @@ class EventsView: NSView {
     func containsMouseLocation() -> Bool {
         if cocoaCB == nil { return false }
         var topMargin: CGFloat = 0.0
-        let menuBarHeight = NSApp.mainMenu!.menuBarHeight
+        let menuBarHeight = NSApp.mainMenu?.menuBarHeight ?? 23.0
+
+        guard let window = cocoaCB.window else { return false }
+        guard var vF = window.screen?.frame else { return false }
 
-        if cocoaCB.window.isInFullscreen && (menuBarHeight > 0) {
+        if window.isInFullscreen && (menuBarHeight > 0) {
             topMargin = TitleBar.height + 1 + menuBarHeight
         }
 
-        guard var vF = window?.screen?.frame else { return false }
         vF.size.height -= topMargin
 
-        let vFW = window!.convertFromScreen(vF)
+        let vFW = window.convertFromScreen(vF)
         let vFV = convert(vFW, from: nil)
-        let pt = convert(window!.mouseLocationOutsideOfEventStream, from: nil)
+        let pt = convert(window.mouseLocationOutsideOfEventStream, from: nil)
 
         var clippedBounds = bounds.intersection(vFV)
-        if !cocoaCB.window.isInFullscreen {
+        if !window.isInFullscreen {
             clippedBounds.origin.y += TitleBar.height
             clippedBounds.size.height -= TitleBar.height
         }
@@ -279,8 +281,8 @@ class EventsView: NSView {
     }
 
     func canHideCursor() -> Bool {
-        if cocoaCB.window == nil { return false }
-        return !hasMouseDown && containsMouseLocation() && window!.isKeyWindow
+        guard let window = cocoaCB.window else { return false }
+        return !hasMouseDown && containsMouseLocation() && window.isKeyWindow
     }
 
     func getMpvButton(_ event: NSEvent) -> Int32 {