Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.SqlXml/System/Xml/Xsl/XsltOld/UseAttributesetsAction.cs

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+// <copyright file="UseAttributeSetsAction.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Xml.Xsl.XsltOld {
+    using Res = System.Xml.Utils.Res;
+    using System;
+    using System.Diagnostics;
+    using System.Xml;
+    using System.Xml.XPath;
+    using System.Collections;
+
+    internal class UseAttributeSetsAction : CompiledAction {
+        private XmlQualifiedName[]  useAttributeSets;
+        private string              useString;
+
+        private const int  ProcessingSets = 2;
+
+        internal XmlQualifiedName[] UsedSets {
+            get { return this.useAttributeSets; }
+        }
+
+        internal override void Compile(Compiler compiler) {
+            Debug.Assert(Ref.Equal(compiler.Input.LocalName, compiler.Atoms.UseAttributeSets));
+            this.useString = compiler.Input.Value;
+
+            Debug.Assert(this.useAttributeSets == null);
+
+            if (this.useString.Length == 0) {
+                // Split creates empty node is spliting empty string
+                this.useAttributeSets = new XmlQualifiedName[0];
+                return;
+            }
+
+            string[] qnames = XmlConvert.SplitString(this.useString);
+
+            try {
+                this.useAttributeSets = new XmlQualifiedName[qnames.Length]; {
+                    for (int i = 0; i < qnames.Length; i++) {
+                        this.useAttributeSets[i] = compiler.CreateXPathQName(qnames[i]);
+                    }
+                }
+            }
+            catch (XsltException) {
+                if (!compiler.ForwardCompatibility) {
+                    // Rethrow the exception if we're not in forwards-compatible mode
+                    throw;
+                }
+                // Ignore the whole list in forwards-compatible mode
+                this.useAttributeSets = new XmlQualifiedName[0];
+            }
+        }
+
+        internal override void Execute(Processor processor, ActionFrame frame) {
+            switch(frame.State) {
+            case Initialized:
+                frame.Counter = 0;
+                frame.State = ProcessingSets;
+                goto case ProcessingSets;
+
+            case ProcessingSets:
+                if (frame.Counter < this.useAttributeSets.Length) {
+                    AttributeSetAction action = processor.RootAction.GetAttributeSet(this.useAttributeSets[frame.Counter]);
+                    frame.IncrementCounter();
+                    processor.PushActionFrame(action, frame.NodeSet);
+                }
+                else {
+                    frame.Finished();
+                }
+                break;
+
+            default:
+                Debug.Fail("Invalid Container action execution state");
+		        break;
+            }
+        }
+    }
+}