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