refactor(exportutil): replace file field with pre-assembled info string

- Use C++-side info string for status text instead of template-side file/no_source check
- Add compile_message field for compile error details
- AnswersOnly without info no longer shows spurious text

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: ZnPdCo

src/component/exportutil/README.md

@@ -27,15 +27,13 @@ HTML 导出采用 JSON + 模板 方案：C++ 端通过 `buildExportJson()` 构
 | `total`       | `"总分"`                                                  |
 | `contestant`  | `"选手"`                                                  |
 | `task`        | `"试题"`                                                  |
-| `source_file` | `"源程序："`                                              |
-| `no_source`   | `"未找到选手程序"`                                         |
 | `testcase`    | `"测试点"`                                                |
 | `input`       | `"输入文件"`                                              |
 | `result`      | `"测试结果"`                                              |
 | `time`        | `"运行用时"`                                              |
 | `memory`      | `"内存消耗"`                                              |
-| `score`           | `"得分"`                                                  |
-| `return_to_top`   | `"返回顶部"`                                              |
+| `score`       | `"得分"`                                                  |
+| `return_to_top` | `"返回顶部"`                                            |
 
 ---
 
@@ -54,12 +52,13 @@ HTML 导出采用 JSON + 模板 方案：C++ 端通过 `buildExportJson()` 构
 
 ### tasks 数组内对象
 
-| 字段名    | 类型       | 说明               | 举例              |
-| --------- | ---------- | ------------------ | ----------------- |
-| `score`   | `number`   | 该题单项得分       | `100`             |
-| `bg`      | `string`   | 该题得分背景 (HSL) | `"120, 30%, 60%"` |
-| `file`    | `string`   | 选手程序文件名（可选，若无该字段则表示找不到选手程序）     | `"plus.cpp"`      |
-| `details` | `object[]` | 测试点详情数组     | 见下节            |
+| 字段名              | 类型       | 说明                       | 举例              |
+| ------------------- | ---------- | -------------------------- | ----------------- |
+| `score`             | `number`   | 该题单项得分               | `100`             |
+| `bg`                | `string`   | 该题得分背景 (HSL)         | `"120, 30%, 60%"` |
+| `info`              | `string`   | 评测状态/源文件信息       | `"源程序：plus.cpp"` |
+| `compile_message`   | `string`   | 编译错误详情（可选）       | `"error: expected ';'"` |
+| `details`           | `object[]` | 测试点详情数组             | 见下节            |
 
 ---
 
@@ -96,8 +95,6 @@ HTML 导出采用 JSON + 模板 方案：C++ 端通过 `buildExportJson()` 构
         "total": "总分",
         "contestant": "选手",
         "task": "试题",
-        "source_file": "源程序：",
-        "no_source": "未找到选手程序",
         "testcase": "测试点",
         "input": "输入文件",
         "result": "测试结果",
@@ -117,7 +114,7 @@ HTML 导出采用 JSON + 模板 方案：C++ 端通过 `buildExportJson()` 构
                 {
                     "score": 100,
                     "bg": "120, 30%, 70%",
-                    "file": "plus.cpp",
+                    "info": "源程序：plus.cpp",
                     "details": [
                         { "label": "#1", "row_span": 1, "input": "plus1.in", "result": "评测通过", "time": "0.001 s", "memory": "1.2 MiB", "score": 50, "full_score": 50, "bg": "rgb(192, 255, 192)" },
                         { "label": "#2", "row_span": 1, "input": "plus2.in", "result": "评测通过", "time": "0.002 s", "memory": "1.2 MiB", "score": 50, "full_score": 50, "bg": "rgb(192, 255, 192)" }
@@ -126,7 +123,7 @@ HTML 导出采用 JSON + 模板 方案：C++ 端通过 `buildExportJson()` 构
                 {
                     "score": 50,
                     "bg": "120,28.9006%,82.3499%",
-                    "file": "minus.cpp",
+                    "info": "源程序：minus.cpp",
                     "details": [
                         { "label": "#1", "row_span": 1, "input": "minus1.in", "result": "评测通过", "time": "0.001 s", "memory": "1.2 MiB", "score": 50, "full_score": 50, "bg": "rgb(192, 255, 192)" },
                         { "label": "#2<br>子任务依赖情况:Pure", "row_span": 2, "input": "minus2.in", "result": "答案错误", "time": "0.001 s", "memory": "2.0 MiB", "score": 0, "full_score": 50, "bg": "rgb(255, 192, 192)", "info": "在第四行，读取到 123456，但期望 789123" },
@@ -142,10 +139,10 @@ HTML 导出采用 JSON + 模板 方案：C++ 端通过 `buildExportJson()` 构
             "total_bg": "0, 0%, 90%",
             "total_border": "0, 0%, 70%",
             "tasks": [
-                { "score": 0, "bg": "0, 0%, 90%" },
-                { "score": 0, "bg": "0, 0%, 90%" }
+                { "score": 0, "bg": "0, 0%, 90%", "info": "未测试" },
+                { "score": 0, "bg": "0, 0%, 90%", "info": "未测试" }
             ]
         }
     ]
 }
-```
+```

src/component/exportutil/export_template.html

@@ -209,9 +209,18 @@
                 taskH3.innerText = `${data.i18n.task} ${data.task_names[j]}`;
                 taskContainer.append(taskH3);
 
-                const fileP = document.createElement('p');
-                fileP.innerText = t.file ? `${data.i18n.source_file}${t.file}` : data.i18n.no_source;
-                taskContainer.append(fileP);
+                if (t.info) {
+                    const fileP = document.createElement('p');
+                    fileP.innerText = t.info;
+                    taskContainer.append(fileP);
+                }
+
+                if (t.compile_message) {
+                    const msgPre = document.createElement('pre');
+                    msgPre.textContent = t.compile_message;
+                    msgPre.style.textAlign = 'left';
+                    taskContainer.append(msgPre);
+                }
 
                 if (t.details && t.details.length > 0) {
                     const detailTable = document.createElement('table');

src/component/exportutil/exportutil.cpp

@@ -76,8 +76,6 @@ QJsonObject ExportUtil::buildExportJson(Contest *contest) {
 	i18n["total"] = tr("Total Score");
 	i18n["contestant"] = tr("Contestant");
 	i18n["task"] = tr("Task");
-	i18n["source_file"] = tr("Source file: ");
-	i18n["no_source"] = tr("Cannot find valid source file");
 	i18n["testcase"] = tr("Test Case");
 	i18n["input"] = tr("Input File");
 	i18n["result"] = tr("Result");
@@ -158,9 +156,48 @@ QJsonObject ExportUtil::buildExportJson(Contest *contest) {
 			    taskList[j]->getTaskType() == Task::Interaction ||
 			    taskList[j]->getTaskType() == Task::Communication ||
 			    taskList[j]->getTaskType() == Task::CommunicationExec) {
-				if (contestant->getCheckJudged(j) && contestant->getCompileState(j) == CompileSuccessfully) {
-					tObj["file"] = contestant->getSourceFile(j);
+				QString info;
+
+				if (! contestant->getCheckJudged(j)) {
+					info = tr("Not judged");
+				} else {
+					switch (contestant->getCompileState(j)) {
+						case CompileSuccessfully:
+							info = tr("Source file: ") + contestant->getSourceFile(j);
+							break;
+						case NoValidGraderFile:
+							info = tr("Main grader (grader.*) cannot be found");
+							break;
+						case NoValidSourceFile:
+							info = tr("Cannot find valid source file");
+							break;
+						case CompileTimeLimitExceeded:
+							info = tr("Source file: ") + contestant->getSourceFile(j) +
+							       QString(", ") + tr("Compile time limit exceeded");
+							break;
+						case InvalidCompiler:
+							info = tr("Cannot run given compiler");
+							break;
+						case CompileError:
+							info = tr("Source file: ") + contestant->getSourceFile(j) +
+							       QString(", ") + tr("Compile error");
+							break;
+						default:
+							break;
+					}
+				}
+
+				if (! info.isEmpty()) {
+					tObj["info"] = info;
+				}
+
+				if (contestant->getCheckJudged(j) &&
+				    contestant->getCompileState(j) == CompileError &&
+				    ! contestant->getCompileMessage(j).isEmpty()) {
+					tObj["compile_message"] = contestant->getCompileMessage(j);
 				}
+			} else if (! contestant->getCheckJudged(j)) {
+				tObj["info"] = tr("Not judged");
 			}
 
 			bool isAnswersOnly = taskList[j]->getTaskType() == Task::AnswersOnly;