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//------------------------------------------------------------------------------
// <copyright file="ProcessingInstructionAction.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 ProcessingInstructionAction : ContainerAction {
private const int NameEvaluated = 2;
private const int NameReady = 3;
private Avt nameAvt;
// Compile time precalculated AVT
private string name;
private const char CharX = 'X';
private const char Charx = 'x';
private const char CharM = 'M';
private const char Charm = 'm';
private const char CharL = 'L';
private const char Charl = 'l';
internal ProcessingInstructionAction() {}
internal override void Compile(Compiler compiler) {
CompileAttributes(compiler);
CheckRequiredAttribute(compiler, this.nameAvt, "name");
if(this.nameAvt.IsConstant) {
this.name = this.nameAvt.Evaluate(null, null);
this.nameAvt = null;
if (! IsProcessingInstructionName(this.name)) {
// For Now: set to null to ignore action late;
this.name = null;
}
}
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 {
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.nameAvt == null) {
frame.StoredOutput = this.name;
if(this.name == null) {
// name was static but was bad;
frame.Finished();
break;
}
}
else {
frame.StoredOutput = this.nameAvt.Evaluate(processor, frame);
if (! IsProcessingInstructionName(frame.StoredOutput)) {
frame.Finished();
break;
}
}
goto case NameReady;
case NameReady:
Debug.Assert(frame.StoredOutput != null);
if (processor.BeginEvent(XPathNodeType.ProcessingInstruction, string.Empty, frame.StoredOutput, string.Empty, false) == false) {
// Come back later
frame.State = NameReady;
break;
}
processor.PushActionFrame(frame);
frame.State = ProcessingChildren;
break; // Allow children to run
case ProcessingChildren:
if (processor.EndEvent(XPathNodeType.ProcessingInstruction) == false) {
frame.State = ProcessingChildren;
break;
}
frame.Finished();
break;
default:
Debug.Fail("Invalid ElementAction execution state");
frame.Finished();
break;
}
}
internal static bool IsProcessingInstructionName(string name) {
if (name == null) {
return false;
}
int nameLength = name.Length;
int position = 0;
XmlCharType xmlCharType = XmlCharType.Instance;
while (position < nameLength && xmlCharType.IsWhiteSpace(name[position])) {
position ++;
}
if (position >= nameLength) {
return false;
}
int len = ValidateNames.ParseNCName(name, position);
if (len == 0) {
return false;
}
position += len;
while (position < nameLength && xmlCharType.IsWhiteSpace(name[position])) {
position ++;
}
if (position < nameLength) {
return false;
}
if (nameLength == 3 &&
(name[0] == CharX || name[0] == Charx) &&
(name[1] == CharM || name[1] == Charm) &&
(name[2] == CharL || name[2] == Charl)
) {
return false;
}
return true;
}
}
}
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