KeyMatchBuilder.cs source code in C# .NET

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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 IXPathBuilder GetPredicateBuilder(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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KeyMatchBuilder.cs source code in C# .NET

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