✨ Use guesslang to detect the language

frontend/public/langdetect-worker.js

@@ -0,0 +1,48 @@
+importScripts("guesslang.min.js")
+
+const LANGUAGES = ["json", "py", "html", "sql", "md", "java", "php", "css", "xml", "cpp", "rs", "cs", "rb", "sh", "yaml", "toml", "go", "clj", "ex", "erl", "js", "ts", "swift", "kt", "groovy", "ps1", "dart", "scala"]
+
+const guessLang = new self.GuessLang()
+
+function sendResult(language, confidence, idx) {
+    postMessage({language, confidence, idx})
+}
+
+onmessage = (event) => {
+    const {content, idx} = event.data
+
+    // JSON 快速检测
+    const trimmed = content.trim()
+    if ((trimmed.startsWith("{") && trimmed.endsWith("}")) ||
+        (trimmed.startsWith("[") && trimmed.endsWith("]"))) {
+        try {
+            if (typeof JSON.parse(trimmed) === "object") {
+                sendResult("json", 1.0, idx)
+                return
+            }
+        } catch (e) {
+
+        }
+    }
+
+    guessLang.runModel(content).then((result) => {
+        if (result.length > 0) {
+            const lang = result[0]
+            if (LANGUAGES.includes(lang.languageId) && lang.confidence > 0.15) {
+                sendResult(lang.languageId, lang.confidence, idx)
+                return
+            }
+        }
+
+        for (let lang of result) {
+            if (LANGUAGES.includes(lang.languageId) && lang.confidence > 0.5) {
+                sendResult(lang.languageId, lang.confidence, idx)
+                return
+            }
+        }
+
+        sendResult("text", 0.0, idx)
+    }).catch(() => {
+        sendResult("text", 0.0, idx)
+    })
+}