InputScopeManager.cs source code in C# .NET

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Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / XsltOld / InputScopeManager.cs / 1305376 / InputScopeManager.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
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(prefix != null || prefix.Length != 0);
            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); 
        }
 
        [System.Runtime.TargetedPatchingOptOutAttribute("Performance critical to inline across NGen image boundaries")]
        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; 
        }
    } 
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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