Add Swift API for adding punctuations to text. (#1132)

swift-api-examples/SherpaOnnx.swift

@@ -957,3 +957,52 @@ class SherpaOnnxKeywordSpotterWrapper {
     InputFinished(stream)
   }
 }
+
+// Punctuation
+
+func sherpaOnnxOfflinePunctuationModelConfig(
+  ctTransformer: String,
+  numThreads: Int = 1,
+  debug: Int = 0,
+  provider: String = "cpu"
+) -> SherpaOnnxOfflinePunctuationModelConfig {
+  return SherpaOnnxOfflinePunctuationModelConfig(
+    ct_transformer: toCPointer(ctTransformer),
+    num_threads: Int32(numThreads),
+    debug: Int32(debug),
+    provider: toCPointer(provider)
+  )
+}
+
+func sherpaOnnxOfflinePunctuationConfig(
+  model: SherpaOnnxOfflinePunctuationModelConfig
+) -> SherpaOnnxOfflinePunctuationConfig {
+  return SherpaOnnxOfflinePunctuationConfig(
+    model: model
+  )
+}
+
+class SherpaOnnxOfflinePunctuationWrapper {
+  /// A pointer to the underlying counterpart in C
+  let ptr: OpaquePointer!
+
+  /// Constructor taking a model config
+  init(
+    config: UnsafePointer<SherpaOnnxOfflinePunctuationConfig>!
+  ) {
+    ptr = SherpaOnnxCreateOfflinePunctuation(config)
+  }
+
+  deinit {
+    if let ptr {
+      SherpaOnnxDestroyOfflinePunctuation(ptr)
+    }
+  }
+
+  func addPunct(text: String) -> String {
+    let cText = SherpaOfflinePunctuationAddPunct(ptr, toCPointer(text))
+    let ans = String(cString: cText!)
+    SherpaOfflinePunctuationFreeText(cText)
+    return ans
+  }
+}