Gate Tolk behind use_tolk feature to support compilation on UWP.

Cargo.toml

@@ -11,6 +11,10 @@ edition = "2018"
 [lib]
 crate-type = ["lib", "cdylib", "staticlib"]
 
+[features]
+
+use_tolk = ["tolk"]
+
 [dependencies]
 lazy_static = "1"
 log = "0.4"
@@ -20,7 +24,7 @@ thiserror = "1"
 env_logger = "0.7"
 
 [target.'cfg(windows)'.dependencies]
-tolk = ">= 0.2.1"
+tolk = { version = ">= 0.2.1", optional = true }
 winrt = "0.7"
 tts_winrt_bindings = { version = "0.1", path="winrt_bindings" }
 

src/backends/mod.rs

@@ -1,7 +1,7 @@
 #[cfg(target_os = "linux")]
 mod speech_dispatcher;
 
-#[cfg(windows)]
+#[cfg(all(windows, feature = "use_tolk"))]
 mod tolk;
 
 #[cfg(windows)]
@@ -19,7 +19,7 @@ mod av_foundation;
 #[cfg(target_os = "linux")]
 pub(crate) use self::speech_dispatcher::*;
 
-#[cfg(windows)]
+#[cfg(all(windows, feature = "use_tolk"))]
 pub(crate) use self::tolk::*;
 
 #[cfg(target_arch = "wasm32")]

src/backends/tolk.rs

@@ -1,4 +1,4 @@
-#[cfg(windows)]
+#[cfg(all(windows, feature = "use_tolk"))]
 use log::{info, trace};
 use tolk::Tolk as TolkPtr;
 

src/lib.rs

@@ -33,7 +33,7 @@ pub enum Backends {
     SpeechDispatcher,
     #[cfg(target_arch = "wasm32")]
     Web,
-    #[cfg(windows)]
+    #[cfg(all(windows, feature = "use_tolk"))]
     Tolk,
     #[cfg(windows)]
     WinRT,
@@ -167,7 +167,7 @@ impl TTS {
                 let tts = backends::Web::new()?;
                 Ok(TTS(Box::new(tts)))
             }
-            #[cfg(windows)]
+            #[cfg(all(windows, feature = "use_tolk"))]
             Backends::Tolk => {
                 let tts = backends::Tolk::new();
                 if let Some(tts) = tts {
@@ -200,12 +200,14 @@ impl TTS {
     pub fn default() -> Result<TTS, Error> {
         #[cfg(target_os = "linux")]
         let tts = TTS::new(Backends::SpeechDispatcher);
-        #[cfg(windows)]
+        #[cfg(all(windows, feature = "use_tolk"))]
         let tts = if let Ok(tts) = TTS::new(Backends::Tolk) {
             Ok(tts)
         } else {
             TTS::new(Backends::WinRT)
         };
+        #[cfg(all(windows, not(feature = "use_tolk")))]
+        let tts = TTS::new(Backends::WinRT);
         #[cfg(target_arch = "wasm32")]
         let tts = TTS::new(Backends::Web);
         #[cfg(target_os = "macos")]