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//------------------------------------------------------------------------------
// <copyright file="Avt.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.Collections;
using System.Xml;
using System.Xml.XPath;
using System.Text;
internal sealed class Avt {
private string constAvt;
private TextEvent[] events;
private Avt(string constAvt) {
Debug.Assert(constAvt != null);
this.constAvt = constAvt;
}
private Avt(ArrayList eventList) {
Debug.Assert(eventList != null);
this.events = new TextEvent[eventList.Count];
for(int i = 0; i < eventList.Count; i ++) {
this.events[i] = (TextEvent) eventList[i];
}
}
public bool IsConstant {
get {return this.events == null;}
}
internal string Evaluate(Processor processor, ActionFrame frame) {
if (IsConstant) {
Debug.Assert(constAvt != null);
return constAvt;
}
else {
Debug.Assert(processor != null && frame != null);
StringBuilder builder = processor.GetSharedStringBuilder();
for(int i = 0; i < events.Length; i ++) {
builder.Append(events[i].Evaluate(processor, frame));
}
processor.ReleaseSharedStringBuilder();
return builder.ToString();
}
}
internal static Avt CompileAvt(Compiler compiler, string avtText) {
Debug.Assert(compiler != null);
Debug.Assert(avtText != null);
bool constant;
ArrayList list = compiler.CompileAvt(avtText, out constant);
return constant ? new Avt(avtText) : new Avt(list);
}
}
}
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