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[GitHub] mbeckerle commented on a change in pull request #61: Base64, gzip, and line-folding layering


mbeckerle commented on a change in pull request #61: Base64, gzip, and line-folding layering
URL: https://github.com/apache/incubator-daffodil/pull/61#discussion_r185880275
 
 

 ##########
 File path: daffodil-core/src/main/scala/org/apache/daffodil/grammar/primitives/LayeredSequence.scala
 ##########
 @@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.daffodil.grammar.primitives
+
+import org.apache.daffodil.grammar.Terminal
+import org.apache.daffodil.dsom._
+import org.apache.daffodil.processors.parsers.{ Parser => DaffodilParser }
+import org.apache.daffodil.processors.unparsers.{ Unparser => DaffodilUnparser }
+import org.apache.daffodil.grammar.Gram
+import org.apache.daffodil.grammar.EmptyGram
+import org.apache.daffodil.util.Misc
+import org.apache.daffodil.processors.parsers.LayeredSequenceParser
+import org.apache.daffodil.processors.unparsers.LayeredSequenceUnparser
+
+case class LayeredSequence(sq: SequenceTermBase, rawTerms: Seq[Gram])
+  extends Terminal(sq, true) {
 
 Review comment:
   Further thought, and I'll put this in scaladoc, which is that while LayeredSequence looks same as sequence now, once SequenceCombinator evolves (as expected), they will differ much more substantially. LayeredSequence will still take only a single body parser, not a vector thereof.
   
   I will change grammar and prim to take single body grammar object, not vector thereof, which will clarify a few things. The grammar will also not be wrapping things that lay down separators around, only to (hopefully) have them optimize out - this is what might not have been working due to inherited non-layer properties on the sequence. It will also prevent an array from being the direct child of a layer, since an array may need separators, etc. 

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