Quick fix to ignore a specific error (#25915).

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

Index: pkg/analysis_server/lib/src/services/correction/fix_internal.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
index 3fdd5f9a3db8a3b7a43e2afc1012365455acbf5e..dada281823dbb821c776c84e5badb4865106410a 100644
--- a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
+++ b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
@@ -32,6 +32,7 @@ import 'package:analyzer/src/dart/ast/token.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/member.dart';
 import 'package:analyzer/src/dart/element/type.dart';
+import 'package:analyzer/src/dart/scanner/scanner.dart';

[scheglov, 2016/03/04 18:55:20]

Do we need this import?

[pquitslund, 2016/03/04 19:09:39]

We don't!  That was dead.  Removed.

 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
@@ -143,6 +144,15 @@ class FixProcessor {
         new NodeLocator2(errorOffset, errorEnd - 1).searchWithin(unit);
     // analyze ErrorCode
     ErrorCode errorCode = error.errorCode;
+    // add ignore fix for ignorable errors.
+    // note that this fix needs to be added before fixes that side-effect
+    // the utils instance.
+    if (errorCode is StaticWarningCode ||
+        errorCode is StaticTypeWarningCode ||
+        errorCode is HintCode ||
+        errorCode is LintCode) {
+      _addFix_ignore(errorCode);
+    }
     if (errorCode == StaticWarningCode.UNDEFINED_CLASS_BOOLEAN) {
       _addFix_boolInsteadOfBoolean();
     }
@@ -1383,6 +1393,18 @@ class FixProcessor {
     }
   }
 
+  void _addFix_ignore(ErrorCode errorCode) {
+    int offset = node.offset;
+    int lineOffset = utils.getLineThis(offset);
+
+    exitPosition = new Position(file, lineOffset - 1);
+    String indent = utils.getLinePrefix(offset);
+    String errorCodeName = errorCode.name.toLowerCase();
+    String content = '$indent//ignore: $errorCodeName$eol';
+    _addReplaceEdit(rf.rangeStartLength(lineOffset, 0), content);
+    _addFix(DartFixKind.IGNORE_ERROR, [errorCodeName]);
+  }
+
   void _addFix_illegalAsyncReturnType() {
     // prepare the existing type
     TypeName typeName = node.getAncestor((n) => n is TypeName);