Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,155 @@
+//------------------------------------------------------------------------------
+// <copyright file="InputScopeManager.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 InputScopeManager  {
+        private InputScope     scopeStack;
+        private string         defaultNS = string.Empty;
+        private XPathNavigator navigator;    // We need this nsvigator for document() function implementation
+
+        public InputScopeManager(XPathNavigator navigator, InputScope rootScope) {
+            this.navigator = navigator;
+            this.scopeStack = rootScope;
+        }
+
+        internal InputScope CurrentScope {
+            get { return this.scopeStack; }
+        }
+
+        internal InputScope VariableScope {
+            get {
+                Debug.Assert(this.scopeStack != null);
+                Debug.Assert(this.scopeStack.Parent != null);
+                return this.scopeStack.Parent;
+            }
+        }
+
+        internal InputScopeManager Clone() {
+            InputScopeManager manager = new InputScopeManager(this.navigator, null);
+            manager.scopeStack = this.scopeStack;
+            manager.defaultNS  = this.defaultNS;
+            return manager;
+        }
+
+        public XPathNavigator Navigator {
+            get {return this.navigator;}
+        }
+
+        internal InputScope PushScope() {
+            this.scopeStack = new InputScope(this.scopeStack);
+            return this.scopeStack;
+        }
+
+        internal void PopScope() {
+            Debug.Assert(this.scopeStack != null, "Push/Pop disbalance");
+            if (this.scopeStack == null) {
+                return;
+            }
+
+            for (NamespaceDecl scope = this.scopeStack.Scopes; scope != null; scope = scope.Next) {
+                this.defaultNS = scope.PrevDefaultNsUri;
+            }
+
+            this.scopeStack = this.scopeStack.Parent;
+        }
+
+        internal void PushNamespace(string prefix, string nspace) {
+            Debug.Assert(this.scopeStack != null, "PushScope wasn't called");
+            Debug.Assert(prefix != null);
+            Debug.Assert(nspace != null);
+            this.scopeStack.AddNamespace(prefix, nspace, this.defaultNS);
+
+            if (prefix == null || prefix.Length == 0) {
+                this.defaultNS = nspace;
+            }
+        }
+
+        // CompileContext
+
+        public string DefaultNamespace {
+            get { return this.defaultNS; }
+        }
+
+        private string ResolveNonEmptyPrefix(string prefix) {
+            Debug.Assert(this.scopeStack != null, "PushScope wasn't called");
+            Debug.Assert(!string.IsNullOrEmpty(prefix));
+            if (prefix == "xml") {
+                return XmlReservedNs.NsXml;
+            }
+            else if (prefix == "xmlns") {
+                return XmlReservedNs.NsXmlNs;
+            }
+
+            for (InputScope inputScope = this.scopeStack; inputScope != null; inputScope = inputScope.Parent) {
+                string nspace = inputScope.ResolveNonAtom(prefix);
+                if (nspace != null) {
+                    return nspace;
+                }
+            }
+            throw XsltException.Create(Res.Xslt_InvalidPrefix, prefix);
+        }
+
+        public string ResolveXmlNamespace(string prefix) {
+            Debug.Assert(prefix != null);
+            if (prefix.Length == 0) {
+                return this.defaultNS;
+            }
+            return ResolveNonEmptyPrefix(prefix);
+        }
+
+        public string ResolveXPathNamespace(string prefix) {
+            Debug.Assert(prefix != null);
+            if (prefix.Length == 0) {
+                return string.Empty;
+            }
+            return ResolveNonEmptyPrefix(prefix);
+        }
+
+        internal void InsertExtensionNamespaces(string[] nsList) {
+            Debug.Assert(this.scopeStack != null, "PushScope wasn't called");
+            Debug.Assert(nsList != null);
+            for (int idx = 0; idx < nsList.Length; idx++) {
+                this.scopeStack.InsertExtensionNamespace(nsList[idx]);
+            }
+        }
+
+        internal bool IsExtensionNamespace(String nspace) {
+            Debug.Assert(this.scopeStack != null, "PushScope wasn't called");
+            for (InputScope inputScope = this.scopeStack; inputScope != null; inputScope = inputScope.Parent) {
+                if (inputScope.IsExtensionNamespace( nspace )) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        internal void InsertExcludedNamespaces(string[] nsList) {
+            Debug.Assert(this.scopeStack != null, "PushScope wasn't called");
+            Debug.Assert(nsList != null);
+            for (int idx = 0; idx < nsList.Length; idx++) {
+                this.scopeStack.InsertExcludedNamespace(nsList[idx]);
+            }
+        }
+
+        internal bool IsExcludedNamespace(String nspace) {
+            Debug.Assert(this.scopeStack != null, "PushScope wasn't called");
+            for (InputScope inputScope = this.scopeStack; inputScope != null; inputScope = inputScope.Parent) {
+                if (inputScope.IsExcludedNamespace( nspace )) {
+                    return true;
+                }
+            }
+            return false;
+        }
+    }
+}
+