some ideas including stub

gui/src/imp/mod.rs

@@ -31,8 +31,7 @@ pub trait AudioSystemInterface: Sized {
         each: impl FnMut(Vec<u8>, bool) + Send + 'static,
     ) -> Result<(), Error>;
 
-    /// Begin playback of an audio stream, returning an object that can be passed
-    /// with opus frames.
+    /// Begin playback of an audio stream, returning an object that can be passed  opus frames.
     fn create_player(&mut self) -> Result<Self::AudioPlayer, Error>;
 }
 
@@ -89,18 +88,17 @@ pub trait PlatformInterface {
 // Platform Modules
 // ============================================================================
 
-#[cfg(feature = "web")]
-pub mod web;
-
 #[cfg(any(feature = "desktop", feature = "mobile"))]
-pub mod connect;
-#[cfg(any(feature = "desktop", feature = "mobile"))]
-pub mod native_audio;
-
+mod connect;
 #[cfg(feature = "desktop")]
-pub mod desktop;
+mod desktop;
 #[cfg(feature = "mobile")]
-pub mod mobile;
+mod mobile;
+#[cfg(any(feature = "desktop", feature = "mobile"))]
+mod native_audio;
+mod stub;
+#[cfg(feature = "web")]
+mod web;
 
 // ============================================================================
 // Platform Type Alias
@@ -115,20 +113,44 @@ pub type Platform = desktop::DesktopPlatform;
 #[cfg(all(feature = "mobile", not(feature = "web"), not(feature = "desktop")))]
 pub type Platform = mobile::MobilePlatform;
 
+#[cfg(all(
+    not(feature = "mobile"),
+    not(feature = "web"),
+    not(feature = "desktop")
+))]
+pub type Platform = stub::StubPlatform;
+
 pub type AudioSystem = <Platform as PlatformInterface>::AudioSystem;
 pub type AudioPlayer = <AudioSystem as AudioSystemInterface>::AudioPlayer;
 
 // ========================
 // Platform Async Runtime
 // ========================
+
 // Note: these can not be part of the Platform because they differ in Send requiremets
 #[cfg(all(any(feature = "desktop", feature = "mobile"), not(feature = "web")))]
-pub use native_audio::{spawn, SpawnHandle};
+pub use connect::{spawn, SpawnHandle};
+#[cfg(all(
+    not(feature = "desktop"),
+    not(feature = "mobile"),
+    not(feature = "web")
+))]
+pub use stub::{spawn, SpawnHandle};
 #[cfg(feature = "web")]
 pub use web::{spawn, SpawnHandle};
 
-/// Compile-time assertion that CurrentPlatform implements Platform.
+// =======================
+// Compile-time Assertions
+// =======================
 const _: () = {
     fn assert_platform<T: PlatformInterface>() {}
-    let _ = assert_platform::<Platform>;
+
+    // Check each implementation, and prevent warnings that the implementations are unused.
+    #[cfg(feature = "web")]
+    let _ = assert_platform::<web::WebPlatform>;
+    #[cfg(feature = "desktop")]
+    let _ = assert_platform::<desktop::DesktopPlatform>;
+    #[cfg(feature = "mobile")]
+    let _ = assert_platform::<mobile::MobilePlatform>;
+    let _ = assert_platform::<stub::StubPlatform>;
 };