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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / Xslt / KeyMatchBuilder.cs / 1305376 / KeyMatchBuilder.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Collections; using System.Collections.Generic; using System.Xml; using System.Xml.XPath; using MS.Internal.Xml; using System.Xml.Xsl.XPath; using System.Xml.Xsl.Qil; namespace System.Xml.Xsl.Xslt { internal class KeyMatchBuilder : XPathBuilder, XPathPatternParser.IPatternBuilder { private int depth = 0; PathConvertor convertor; public KeyMatchBuilder(IXPathEnvironment env) : base(env) { convertor = new PathConvertor(env.Factory); } public override void StartBuild() { Debug.Assert(0 <= depth && depth <= 1, "this shouldn't happen"); if (depth == 0) { base.StartBuild(); } depth ++; } public override QilNode EndBuild(QilNode result) { depth --; Debug.Assert(0 <= depth && depth <= 1, "this shouldn't happen"); if (result == null) { // special door to clean builder state in exception handlers return base.EndBuild(result); } if (depth == 0) { Debug.Assert(base.numFixupLast == 0); Debug.Assert(base.numFixupPosition == 0); result = convertor.ConvertReletive2Absolute(result, base.fixupCurrent); result = base.EndBuild(result); } return result; } // -------------------------------------- GetPredicateBuilder() --------------------------------------- public virtual IXPathBuilderGetPredicateBuilder(QilNode ctx) { return this; } // This code depends on particula shapes that XPathBuilder generates. // It works only on pathes. // ToDo: We can do better here. internal class PathConvertor : QilReplaceVisitor { new XPathQilFactory f; QilNode fixup; public PathConvertor(XPathQilFactory f) : base (f.BaseFactory) { this.f = f; } public QilNode ConvertReletive2Absolute(QilNode node, QilNode fixup) { Debug.Assert(node != null); Debug.Assert(fixup != null); this.fixup = fixup; return this.Visit(node); } // transparantly passing through Union and DocOrder protected override QilNode Visit(QilNode n) { if ( n.NodeType == QilNodeType.Union || n.NodeType == QilNodeType.DocOrderDistinct || n.NodeType == QilNodeType.Filter || n.NodeType == QilNodeType.Loop ) { return base.Visit(n); } return n; } // Filers that travers Content being converted to global travers: // Filter($j= ... Filter($i = Content(fixup), ...)) -> Filter($j= ... Filter($i = Loop($j = DesendentOrSelf(Root(fixup)), Content($j), ...))) protected override QilNode VisitLoop(QilLoop n) { if (n.Variable.Binding.NodeType == QilNodeType.Root || n.Variable.Binding.NodeType == QilNodeType.Deref) { // This is absolute path already. We shouldn't touch it return n; } if (n.Variable.Binding.NodeType == QilNodeType.Content) { // This is "begin" of reletive path. Let's rewrite it as absolute: QilUnary content = (QilUnary)n.Variable.Binding; Debug.Assert(content.Child == this.fixup, "Unexpected content node"); QilIterator it = f.For(f.DescendantOrSelf(f.Root(this.fixup))); content.Child = it; n.Variable.Binding = f.Loop(it, content); return n; } n.Variable.Binding = Visit(n.Variable.Binding); return n; } protected override QilNode VisitFilter(QilLoop n) { return VisitLoop(n); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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