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//------------------------------------------------------------------------------
// <copyright file="KeyMatchBuilder.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
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<QilNode> 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) {
QilDepthChecker.Check(node);
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);
}
}
}
}
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