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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
// This file contain implementations details that are subject to change without notice.
// Use at your own risk.
//
using System;
using System.Diagnostics;
using System.IO;
namespace Microsoft.VisualStudio.Text.Implementation
{
internal class StringRebuilderForCompressedChars : UnaryStringRebuilder
{
private readonly Page _content;
internal static StringRebuilder Create(Page content, ILineBreaks lineBreaks)
{
return StringRebuilderForCompressedChars.Create(content, lineBreaks, 0, content.Length, 0, lineBreaks.Length);
}
private static StringRebuilder Create(Page content, ILineBreaks lineBreaks, int start, int length, int lineBreaksStart, int linebreaksLength)
{
Debug.Assert(content.Length > 0);
var expanded = content.Expand();
return new StringRebuilderForCompressedChars(content, lineBreaks, start, length, lineBreaksStart, linebreaksLength, expanded[start], expanded[start + length - 1]);
}
private StringRebuilderForCompressedChars(Page content, ILineBreaks lineBreaks, int start, int length, int lineBreaksStart, int linebreaksLength, char first, char last)
: base(lineBreaks, start, length, lineBreaksStart, linebreaksLength, first, last)
{
_content = content;
}
#region StringRebuilder Members
public override char this[int index]
{
get
{
return this.GetChar(_content.Expand(), index);
}
}
public override string GetText(Span span)
{
return this.GetText(_content.Expand(), span);
}
public override void CopyTo(int sourceIndex, char[] destination, int destinationIndex, int count)
{
this.CopyTo(_content.Expand(), sourceIndex, destination, destinationIndex, count);
}
public override void Write(TextWriter writer, Span span)
{
this.Write(_content.Expand(), writer, span);
}
public override StringRebuilder GetSubText(Span span)
{
if (span.End > this.Length)
throw new ArgumentOutOfRangeException("span");
if (span.Length == this.Length)
return this;
else if (span.Length == 0)
return StringRebuilder.Empty;
else
{
int firstLineNumber;
int lastLineNumber;
this.FindFirstAndLastLines(span, out firstLineNumber, out lastLineNumber);
return StringRebuilderForCompressedChars.Create(_content, _lineBreaks, span.Start + _textSpanStart, span.Length, firstLineNumber, lastLineNumber - firstLineNumber);
}
}
#endregion
}
}
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