Minor improvements to ArcanistJSONLinter

Summary: Self-explanatory.

Test Plan: `arc unit`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11324

src/lint/linter/ArcanistJSONLinter.php

@@ -5,6 +5,8 @@
  */
 final class ArcanistJSONLinter extends ArcanistLinter {
 
+  const LINT_PARSE_ERROR = 1;
+
   public function getInfoName() {
     return 'JSON Lint';
   }
@@ -21,17 +23,26 @@ final class ArcanistJSONLinter extends ArcanistLinter {
     return 'json';
   }
 
+  public function getLintNameMap() {
+    return array(
+      self::LINT_PARSE_ERROR => pht('Parse Error'),
+    );
+  }
+
+  protected function canCustomizeLintSeverities() {
+    return false;
+  }
+
   public function lintPath($path) {
     $data = $this->getData($path);
 
     try {
-      $parser = new PhutilJSONParser();
+      id(new PhutilJSONParser())->parse($data);
-      $parser->parse($data);
     } catch (PhutilJSONParserException $ex) {
       $this->raiseLintAtLine(
         $ex->getSourceLine(),
         $ex->getSourceChar(),
-        $this->getLinterName(),
+        self::LINT_PARSE_ERROR,
         $ex->getMessage());
     }
   }