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//------------------------------------------------------------------------------
// <copyright file="AttributeAction.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
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 AttributeAction : ContainerAction {
private const int NameDone = 2;
private Avt nameAvt;
private Avt nsAvt;
private InputScopeManager manager;
// Compile time precalculated AVTs
private string name;
private string nsUri;
private PrefixQName qname; // When we not have AVTs at all we can do this. null otherwise.
private static PrefixQName CreateAttributeQName(string name, string nsUri, InputScopeManager manager) {
// if name == "xmlns" we don't need to generate this attribute.
// to avoid i'ts generation we can return false and not add AtributeCation to it's parent container action
// for now not creating this.qname will do the trick at execution time
if (name == "xmlns") return null;
if (nsUri == XmlReservedNs.NsXmlNs) {
throw XsltException.Create(Res.Xslt_ReservedNS, nsUri);
}
PrefixQName qname = new PrefixQName();
qname.SetQName(name);
qname.Namespace = nsUri != null ? nsUri : manager.ResolveXPathNamespace(qname.Prefix);
if (qname.Prefix.StartsWith("xml", StringComparison.Ordinal)) {
if (qname.Prefix.Length == 3) { // prefix == "xml"
if (qname.Namespace == XmlReservedNs.NsXml && (qname.Name == "lang" || qname.Name == "space")) {
// preserve prefix for xml:lang and xml:space
}
else {
qname.ClearPrefix();
}
}
else if (qname.Prefix == "xmlns") {
if (qname.Namespace == XmlReservedNs.NsXmlNs) {
// if NS wasn't specified we have to use prefix to find it and this is imposible for 'xmlns'
throw XsltException.Create(Res.Xslt_InvalidPrefix, qname.Prefix);
}
else {
qname.ClearPrefix();
}
}
}
return qname;
}
internal override void Compile(Compiler compiler) {
CompileAttributes(compiler);
CheckRequiredAttribute(compiler, this.nameAvt, "name");
this.name = PrecalculateAvt(ref this.nameAvt);
this.nsUri = PrecalculateAvt(ref this.nsAvt );
// if both name and ns are not AVT we can calculate qname at compile time and will not need namespace manager anymore
if (this.nameAvt == null && this.nsAvt == null) {
if(this.name != "xmlns") {
this.qname = CreateAttributeQName(this.name, this.nsUri, compiler.CloneScopeManager());
}
}
else {
this.manager = compiler.CloneScopeManager();
}
if (compiler.Recurse()) {
CompileTemplate(compiler);
compiler.ToParent();
}
}
internal override bool CompileAttribute(Compiler compiler) {
string name = compiler.Input.LocalName;
string value = compiler.Input.Value;
if (Ref.Equal(name, compiler.Atoms.Name)) {
this.nameAvt = Avt.CompileAvt(compiler, value);
}
else if (Ref.Equal(name, compiler.Atoms.Namespace)) {
this.nsAvt = Avt.CompileAvt(compiler, value);
}
else {
return false;
}
return true;
}
internal override void Execute(Processor processor, ActionFrame frame) {
Debug.Assert(processor != null && frame != null);
switch (frame.State) {
case Initialized:
if(this.qname != null) {
frame.CalulatedName = this.qname;
}
else {
frame.CalulatedName = CreateAttributeQName(
this.nameAvt == null ? this.name : this.nameAvt.Evaluate(processor, frame),
this.nsAvt == null ? this.nsUri : this.nsAvt .Evaluate(processor, frame),
this.manager
);
if(frame.CalulatedName == null) {
// name == "xmlns" case. Ignore xsl:attribute
frame.Finished();
break;
}
}
goto case NameDone;
case NameDone :
{
PrefixQName qname = frame.CalulatedName;
if (processor.BeginEvent(XPathNodeType.Attribute, qname.Prefix, qname.Name, qname.Namespace, false) == false) {
// Come back later
frame.State = NameDone;
break;
}
processor.PushActionFrame(frame);
frame.State = ProcessingChildren;
break; // Allow children to run
}
case ProcessingChildren:
if (processor.EndEvent(XPathNodeType.Attribute) == false) {
frame.State = ProcessingChildren;
break;
}
frame.Finished();
break;
default:
Debug.Fail("Invalid ElementAction execution state");
break;
}
}
}
}
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