judge: support kattis checker (#947)

packages/hydrojudge/src/checkers.ts

@@ -228,6 +228,41 @@ const checkers: Record<string, Checker> = new Proxy({
         }
         return parse(stderr, config.score);
     },
+
+    // https://www.kattis.com/problem-package-format/spec/2023-07-draft.html#output-validator
+    async kattis(config) {
+        const { files, code } = await runQueued(`${config.execute} input answer_file feedback_dir`, {
+            copyIn: {
+                input: config.input,
+                answer_file: config.output,
+                'feedback_dir/placeholder': { content: '' },
+                ...config.copyIn,
+            },
+            stdin: config.user_stdout,
+            copyOut: [
+                'feedback_dir/score.txt?',
+                'feedback_dir/judgemessage.txt?',
+                'feedback_dir/teammessage.txt?',
+                'feedback_dir/judgeerror.txt?',
+            ],
+        });
+
+        const status = code === 42
+            ? STATUS.STATUS_ACCEPTED
+            : code === 43
+                ? STATUS.STATUS_WRONG_ANSWER
+                : STATUS.STATUS_SYSTEM_ERROR;
+
+        const score = status === STATUS.STATUS_ACCEPTED
+            ? config.score
+            : +files['feedback_dir/score.txt'] || 0;
+
+        const message = status === STATUS.STATUS_SYSTEM_ERROR
+            ? files['feedback_dir/judgeerror.txt'] || `Checker exited with code ${code}`
+            : files['feedback_dir/teammessage.txt'] || files['feedback_dir/judgemessage.txt'] || '';
+
+        return { status, score, message };
+    },
 }, {
     get(self, key) {
         if (!self[key]) throw new FormatError('Unknown checker type {0}', [key]);

packages/ui-default/components/monaco/schema/problemconfig.ts

@@ -70,7 +70,7 @@ const problemConfigSchema: JSONSchema7 = {
     subType: { type: 'string' },
     langs: { type: 'array', items: { type: 'string' } },
     target: { type: 'string' },
-    checker_type: { enum: ['default', 'lemon', 'syzoj', 'hustoj', 'testlib', 'strict', 'qduoj'] },
+    checker_type: { enum: ['default', 'lemon', 'syzoj', 'hustoj', 'testlib', 'strict', 'qduoj', 'kattis'] },
     checker: {
       oneOf: [
         { type: 'string', enum: testlibCheckers },

packages/ui-default/components/problemconfig/ProblemType.tsx

@@ -111,7 +111,7 @@ export default function ProblemType() {
                   panel={(
                     <div className="row">
                       <FormItem columns={4} label="Interface">
-                        <ManagedSelect options={['syzoj', 'hustoj', 'qduoj', 'lemon']} formKey="checker_type" />
+                        <ManagedSelect options={['syzoj', 'hustoj', 'qduoj', 'lemon', 'kattis']} formKey="checker_type" />
                       </FormItem>
                       <SingleFileSelect formKey="checker" label="Checker" withLang />
                     </div>