Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / Xslt / Focus.cs / 1305376 / Focus.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System.Collections.Generic; using System.Diagnostics; using System.Xml.Xsl.XPath; using System.Xml.Xsl.Qil; namespace System.Xml.Xsl.Xslt { using T = XmlQueryTypeFactory; //http://www.w3.org/TR/xslt20/#dt-singleton-focus internal enum SingletonFocusType { // No context set // Used to prevent bugs None, // Document node of the document containing the initial context node // Used while compiling global variables and params InitialDocumentNode, // Initial context node for the transformation // Used while compiling initial apply-templates InitialContextNode, // Context node is specified by iterator // Used while compiling keys Iterator, } internal struct SingletonFocus : IFocus { private XPathQilFactory f; private SingletonFocusType focusType; private QilIterator current; public SingletonFocus(XPathQilFactory f) { this.f = f; focusType = SingletonFocusType.None; current = null; } public void SetFocus(SingletonFocusType focusType) { Debug.Assert(focusType != SingletonFocusType.Iterator); this.focusType = focusType; } public void SetFocus(QilIterator current) { if (current != null) { this.focusType = SingletonFocusType.Iterator; this.current = current; } else { this.focusType = SingletonFocusType.None; this.current = null; } } [Conditional("DEBUG")] private void CheckFocus() { Debug.Assert(focusType != SingletonFocusType.None, "Focus is not set, call SetFocus first"); } public QilNode GetCurrent() { CheckFocus(); switch (focusType) { case SingletonFocusType.InitialDocumentNode: return f.Root(f.XmlContext()); case SingletonFocusType.InitialContextNode : return f.XmlContext(); default: Debug.Assert(focusType == SingletonFocusType.Iterator && current != null, "Unexpected singleton focus type"); return current; } } public QilNode GetPosition() { CheckFocus(); return f.Double(1); } public QilNode GetLast() { CheckFocus(); return f.Double(1); } } internal struct FunctionFocus : IFocus { private bool isSet; private QilParameter current, position, last; public void StartFocus(IListargs, XslFlags flags) { Debug.Assert(! IsFocusSet, "Focus was already set"); int argNum = 0; if ((flags & XslFlags.Current) != 0) { this.current = (QilParameter)args[argNum ++]; Debug.Assert(this.current.Name.NamespaceUri == XmlReservedNs.NsXslDebug && this.current.Name.LocalName == "current"); } if ((flags & XslFlags.Position) != 0) { this.position = (QilParameter)args[argNum ++]; Debug.Assert(this.position.Name.NamespaceUri == XmlReservedNs.NsXslDebug && this.position.Name.LocalName == "position"); } if ((flags & XslFlags.Last) != 0) { this.last = (QilParameter)args[argNum ++]; Debug.Assert(this.last.Name.NamespaceUri == XmlReservedNs.NsXslDebug && this.last.Name.LocalName == "last"); } this.isSet = true; } public void StopFocus() { Debug.Assert(IsFocusSet, "Focus was not set"); isSet = false; this.current = this.position = this.last = null; } public bool IsFocusSet { get { return this.isSet; } } public QilNode GetCurrent() { Debug.Assert(this.current != null, "---- current() is not expected in this function"); return this.current; } public QilNode GetPosition() { Debug.Assert(this.position != null, "---- position() is not expected in this function"); return this.position; } public QilNode GetLast() { Debug.Assert(this.last != null, "---- last() is not expected in this function"); return this.last; } } internal struct LoopFocus : IFocus { private XPathQilFactory f; private QilIterator current, cached, last; public LoopFocus(XPathQilFactory f) { this.f = f; current = cached = last = null; } public void SetFocus(QilIterator current) { this.current = current; cached = last = null; } public bool IsFocusSet { get { return current != null; } } public QilNode GetCurrent() { return current; } public QilNode GetPosition() { return f.XsltConvert(f.PositionOf(current), T.DoubleX); } public QilNode GetLast() { if (last == null) { // Create a let that will be fixed up later in ConstructLoop or by LastFixupVisitor last = f.Let(f.Double(0)); } return last; } public void EnsureCache() { if (cached == null) { cached = f.Let(current.Binding); current.Binding = cached; } } public void Sort(QilNode sortKeys) { if (sortKeys != null) { // If sorting is required, cache the input node-set to support last() within sort key expressions EnsureCache(); // The rest of the loop content must be compiled in the context of already sorted node-set current = f.For(f.Sort(current, sortKeys)); } } public QilLoop ConstructLoop(QilNode body) { QilLoop result; if (last != null) { // last() encountered either in the sort keys or in the body of the current loop EnsureCache(); last.Binding = f.XsltConvert(f.Length(cached), T.DoubleX); } result = f.BaseFactory.Loop(current, body); if (last != null) { result = f.BaseFactory.Loop(last, result); } if (cached != null) { result = f.BaseFactory.Loop(cached, result); } return result; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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