stevedlawrence commented on a change in pull request #262: Unordered sequences
URL: https://github.com/apache/incubator-daffodil/pull/262#discussion_r323998939
 
 

 ##########
 File path: 
daffodil-runtime1/src/main/scala/org/apache/daffodil/infoset/InfosetImpl.scala
 ##########
 @@ -1415,6 +1423,50 @@ sealed class DIComplex(override val erd: 
ElementRuntimeData, val tunable: Daffod
     }
   }
 
+  final def sortChildNodesByPosition(): Unit = {
+    // TODO: Once we upgrade to Scala 2.13 we can call the inplace sort 
method: DAFFODIL-2152
+    // childNodes = childNodes.sortInPlace(_.erd.position)
+    childNodes = childNodes.sortBy(_.erd.position)
+  }
+
+  /*
+   * When parsing unordered sequences it is possible to have non-contiguous 
arrays.
+   * When parsed, these arrays show up as separate DIArrays in the infoset. We 
need
+   * to combine these separate arrays.
+   * */
 
 Review comment:
   Needs documentation about what this is returning. Looks like it returns a 
list of ERDs that are not valid? Presuming the caller will then create 
ValidationErrors? Is it possible/does it make sense to just have this function 
create ValidationErrors directly?

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