Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,154 @@
+//------------------------------------------------------------------------------
+// <copyright file="ProcessingInstructionAction.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;
+
+    internal class ProcessingInstructionAction : ContainerAction {
+        private const int NameEvaluated = 2;
+        private const int NameReady     = 3;
+
+        private Avt       nameAvt;
+        // Compile time precalculated AVT
+        private string    name; 
+
+        private const char CharX = 'X';
+        private const char Charx = 'x';
+        private const char CharM = 'M';
+        private const char Charm = 'm';
+        private const char CharL = 'L';
+        private const char Charl = 'l';
+
+        internal ProcessingInstructionAction() {}
+
+        internal override void Compile(Compiler compiler) {
+            CompileAttributes(compiler);
+            CheckRequiredAttribute(compiler, this.nameAvt, "name");
+
+            if(this.nameAvt.IsConstant) {
+                this.name    = this.nameAvt.Evaluate(null, null);
+                this.nameAvt = null;
+                if (! IsProcessingInstructionName(this.name)) {
+                    // For Now: set to null to ignore action late;
+                   this.name = null;
+               }
+            }
+
+            if (compiler.Recurse()) {
+                CompileTemplate(compiler);
+                compiler.ToParent();
+            }
+        }
+
+        internal override bool CompileAttribute(Compiler compiler) {
+            string name   = compiler.Input.LocalName;
+            string value  = compiler.Input.Value;
+            if (Ref.Equal(name, compiler.Atoms.Name)) {
+                this.nameAvt = Avt.CompileAvt(compiler, value);
+            }
+            else {
+                return false;
+            }
+
+            return true;
+        }
+
+        internal override void Execute(Processor processor, ActionFrame frame) {
+            Debug.Assert(processor != null && frame != null);
+
+            switch (frame.State) {
+            case Initialized:
+                if(this.nameAvt == null) {
+                    frame.StoredOutput = this.name;
+                    if(this.name == null) {
+                        // name was static but was bad;
+                        frame.Finished();
+                        break;
+                    }
+                }
+                else {
+                    frame.StoredOutput = this.nameAvt.Evaluate(processor, frame);
+                    if (! IsProcessingInstructionName(frame.StoredOutput)) {
+                        frame.Finished();
+                        break;
+                    }
+                }
+                goto case NameReady;
+
+            case NameReady:
+                Debug.Assert(frame.StoredOutput != null);
+                if (processor.BeginEvent(XPathNodeType.ProcessingInstruction, string.Empty, frame.StoredOutput, string.Empty, false) == false) {
+                    // Come back later
+                    frame.State = NameReady;
+                    break;
+                }
+                processor.PushActionFrame(frame);
+                frame.State = ProcessingChildren;
+                break;                              // Allow children to run
+
+            case ProcessingChildren:
+                if (processor.EndEvent(XPathNodeType.ProcessingInstruction) == false) {
+                    frame.State = ProcessingChildren;
+                    break;
+                }
+                frame.Finished();
+                break;
+            default:
+                Debug.Fail("Invalid ElementAction execution state");
+                frame.Finished();
+                break;
+            }
+        }
+
+
+        internal static bool IsProcessingInstructionName(string name) {
+            if (name == null) {
+                return false;
+            }
+
+            int nameLength = name.Length;
+            int position   = 0;
+            XmlCharType xmlCharType = XmlCharType.Instance;
+
+            while (position < nameLength && xmlCharType.IsWhiteSpace(name[position])) {
+                position ++;
+            }
+
+            if (position >= nameLength) {
+                return false;
+            }
+
+            int len = ValidateNames.ParseNCName(name, position);
+            if (len == 0) {
+                return false;
+            }
+            position += len;
+
+            while (position < nameLength && xmlCharType.IsWhiteSpace(name[position])) {
+                position ++;
+            }
+
+            if (position < nameLength) {
+                return false;
+            }
+
+            if (nameLength == 3 &&
+                (name[0] == CharX || name[0] == Charx) &&
+                (name[1] == CharM || name[1] == Charm) &&
+                (name[2] == CharL || name[2] == Charl)
+            ) {
+                return false;
+            }
+
+            return true;
+        }
+    }
+}