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//------------------------------------------------------------------------------
// <copyright file="QilStrConcatenator.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
using System.Diagnostics;
using System.Xml;
using System.Text;
using System.Xml.Schema;
using System.Xml.Xsl.XPath;
using System.Xml.Xsl.Qil;
namespace System.Xml.Xsl.Xslt {
internal class QilStrConcatenator {
private XPathQilFactory f;
private StringBuilder builder;
private QilList concat;
private bool inUse = false;
public QilStrConcatenator(XPathQilFactory f) {
this.f = f;
builder = new StringBuilder();
}
public void Reset() {
Debug.Assert(! inUse);
inUse = true;
builder.Length = 0;
concat = null;
}
private void FlushBuilder() {
if (concat == null) {
concat = f.BaseFactory.Sequence();
}
if (builder.Length != 0) {
concat.Add(f.String(builder.ToString()));
builder.Length = 0;
}
}
public void Append(string value) {
Debug.Assert(inUse, "Reset() wasn't called");
builder.Append(value);
}
public void Append(char value) {
Debug.Assert(inUse, "Reset() wasn't called");
builder.Append(value);
}
public void Append(QilNode value) {
Debug.Assert(inUse, "Reset() wasn't called");
if (value != null) {
Debug.Assert(value.XmlType.TypeCode == XmlTypeCode.String);
if (value.NodeType == QilNodeType.LiteralString) {
builder.Append((string)(QilLiteral)value);
} else {
FlushBuilder();
concat.Add(value);
}
}
}
public QilNode ToQil() {
Debug.Assert(inUse); // If we want allow multiple calls to ToQil() this logic should be changed
inUse = false;
if (concat == null) {
return f.String(builder.ToString());
} else {
FlushBuilder();
return f.StrConcat(concat);
}
}
}
}
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