首句不翻译修复: 单句批改直出模式(不套JSON)、token预算按原文长度动态化(原160/句截断长句致整批静默丢弃)、编号对容错扫描器(截断JSON也能救条目)、段末对未译句兜底补翻

app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt

@@ -1919,8 +1919,12 @@ class MainActivity : AppCompatActivity() {
         transSegTimer?.let { uiHandler.removeCallbacks(it) }
         transSegTimer = null
         flushInitialBatch()
-        val refs = seg.sentences.filter { it.text.isNotBlank() }
-        if (translateDisabled || refs.size < 2) return
+        val all = seg.sentences.filter { it.text.isNotBlank() }
+        if (translateDisabled) return
+        // 单句段:初译成功就不用重翻;失败/缺失则兜底补这一句
+        val refs = if (all.size < 2)
+            all.filter { it.trans.isNullOrBlank() } else all
+        if (refs.isEmpty()) return
         if (SummarizePipeline.detectLanguage(refs.joinToString("")) ==
             uiLanguage()
         ) return
@@ -1950,16 +1954,38 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
-    private fun parseNumberedJson(out: String?): Map<String, String>? {
+    // 容错提取 "编号":"译文" 对:顺序扫描,不要求 JSON 完整闭合——
+    // 生成被 maxNewTokens 截断时,已完成的条目仍能救出
+    private fun extractNumberedPairs(out: String?): Map<String, String>? {
         if (out.isNullOrBlank()) return null
-        val a = out.indexOf('{'); val b = out.lastIndexOf('}')
-        if (a < 0 || b <= a) return null
-        return try {
-            val o = org.json.JSONObject(out.substring(a, b + 1))
-            val m = HashMap<String, String>()
-            o.keys().forEach { k -> m[k] = o.optString(k) }
-            m
-        } catch (t: Throwable) { null }
+        val m = HashMap<String, String>()
+        var i = 0
+        while (i < out.length) {
+            if (out[i] != '"') { i++; continue }
+            val keyEnd = out.indexOf(':', i + 1)
+            if (keyEnd < 0) break
+            val key = out.substring(i + 1, keyEnd).trim()
+            if (key.isEmpty() || key.any { c -> !c.isDigit() }) { i++; continue }
+            var j = keyEnd + 1
+            while (j < out.length && out[j] != '"') j++
+            if (j >= out.length) break
+            val sb = StringBuilder()
+            j++
+            while (j < out.length) {
+                val c = out[j]
+                if (c == '\\' && j + 1 < out.length) {
+                    val n = out[j + 1]
+                    sb.append(if (n == 'n') '\n' else if (n == 'r') '\r' else n)
+                    j += 2
+                    continue
+                }
+                if (c == '"') break
+                sb.append(c); j++
+            }
+            m[key] = sb.toString()
+            i = j + 1
+        }
+        return if (m.isEmpty()) null else m
     }
 
     private fun ensureTranslateEngine(): LlmEngine? {
@@ -2021,12 +2047,32 @@ class MainActivity : AppCompatActivity() {
         val targetName = when (uiLanguage()) {
             "ja" -> "日本語"; "en" -> "English"; else -> "简体中文"
         }
-        val numbered = items.mapIndexed { i, (_, t) -> "${i + 1}. $t" }
-                .joinToString("\n")
         translateEngine?.let { runCatching { it.release() } }
         translateEngine = null
         val engine = ensureTranslateEngine()
             ?: run { translateDisabled = true; return null }
+        // 动态预算:按原文总长给输出额度(译文常比原文长,原 160/句 会把
+        // 长句截断成残缺 JSON,整批被静默丢弃——"第一句不翻"的直接死因)
+        val budget = (items.sumOf { it.second.length } * 2 + 96)
+            .coerceAtMost(1200)
+        // 单句 = 直出模式:不套 JSON 包装,无格式可坏,截断也仍是有效译文
+        if (items.size == 1) {
+            val one = try {
+                engine.generate(
+                    systemPrompt = "你是专业翻译。把给出的句子翻译成" + targetName +
+                            "。只输出译文本身,不要解释、不要引号、不要抄写原文。",
+                    userPrompt = items[0].second,
+                    maxNewTokens = budget, temperature = 0f,
+                )
+            } catch (t: Throwable) {
+                Log.w(TAG, "TRANSLATE single failed: ${t.message}"); null
+            }
+            val tr = one?.trim()?.lines()?.firstOrNull { it.isNotBlank() }?.trim()
+            return if (tr.isNullOrEmpty()) null
+            else mapOf(items[0].first to tr)
+        }
+        val numbered = items.mapIndexed { i, (_, t) -> "${i + 1}. $t" }
+                .joinToString("\n")
         val out = try {
             engine.generate(
                 systemPrompt = "你是专业翻译。逐句翻译下面编号句子为" + targetName +
@@ -2036,13 +2082,13 @@ class MainActivity : AppCompatActivity() {
                         "严禁把原句原样作为译文输出;确实无法翻译的句子," +
                         "值输出空字符串。",
                 userPrompt = "【句子】\n$numbered",
-                maxNewTokens = (160 * items.size).coerceAtMost(900),
+                maxNewTokens = budget,
                 temperature = 0f,
             )
         } catch (t: Throwable) {
             Log.w(TAG, "TRANSLATE batch failed: ${t.message}"); null
         }
-        val byIdx = parseNumberedJson(out) ?: return null
+        val byIdx = extractNumberedPairs(out) ?: return null
         val res = HashMap<String, String>()
         items.forEachIndexed { i, (key, _) ->
             byIdx[(i + 1).toString()]?.let { res[key] = it }