Quick Assist for creating a constructor for selected final fields.

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

Index: pkg/analysis_server/lib/src/services/correction/util.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/util.dart b/pkg/analysis_server/lib/src/services/correction/util.dart
index f214c9fd26b792398af53a290f8088f0d58e704f..fc157f46c9a84e47fa2dd4fec06a64b900501bcd 100644
--- a/pkg/analysis_server/lib/src/services/correction/util.dart
+++ b/pkg/analysis_server/lib/src/services/correction/util.dart
@@ -1061,6 +1061,33 @@ class CorrectionUtils {
   }
 
   /**
+   * Return the best locations for a new constructor in the given
+   * [classDeclaration].
+   */
+  ConstructorLocation findNewConstructorLocation(
+      ClassDeclaration classDeclaration) {
+    String eol = endOfLine;
+    List<ClassMember> members = classDeclaration.members;
+    // find the last field/constructor
+    ClassMember lastFieldOrConstructor = null;
+    for (ClassMember member in members) {
+      if (member is FieldDeclaration || member is ConstructorDeclaration) {
+        lastFieldOrConstructor = member;
+      } else {
+        break;
+      }
+    }
+    // after the last field/constructor
+    if (lastFieldOrConstructor != null) {
+      return new ConstructorLocation(eol + eol, lastFieldOrConstructor.end, '');
+    }
+    // at the beginning of the class
+    String suffix = members.isEmpty ? '' : eol;
+    return new ConstructorLocation(
+        eol, classDeclaration.leftBracket.end, suffix);
+  }
+
+  /**
    * Returns the source with indentation changed from [oldIndent] to
    * [newIndent], keeping indentation of lines relative to each other.
    */
@@ -1480,3 +1507,14 @@ class _OrderedOperandsVisitor extends GeneralizingAstVisitor {
     return null;
   }
 }
+
+/**
+ * Describes the location for a newly created [ConstructorDeclaration].
+ */
+class ConstructorLocation {
+  final String prefix;
+  final int offset;
+  final String suffix;
+
+  ConstructorLocation(this.prefix, this.offset, this.suffix);
+}