更新阅读器功能与示例

Sources/RDAIReaderView/NaturalLanguage/RDAINaturalLanguageSemanticScorer.swift

@@ -0,0 +1,19 @@
+import Foundation
+import NaturalLanguage
+
+/// Uses Apple's bundled sentence embeddings when the language asset exists.
+/// Distances are converted to a stable 0...1 ranking signal only within one
+/// query; callers must not compare values across embedding revisions.
+public struct RDAINaturalLanguageSemanticScorer: RDAISemanticScoring {
+    public init() {}
+
+    public func score(query: String, text: String, languageCode: String?) async -> Double? {
+        await Task.detached(priority: .utility) {
+            let language = languageCode.flatMap(NLLanguage.init(rawValue:)) ?? .english
+            guard let embedding = NLEmbedding.sentenceEmbedding(for: language) else { return nil }
+            let distance = embedding.distance(between: query, and: text)
+            guard distance.isFinite else { return nil }
+            return 1 / (1 + Double(distance))
+        }.value
+    }
+}