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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;
using System.Threading;
namespace Microsoft.VisualStudio.Text.Implementation
{
internal class StringRebuilderForString : UnaryStringRebuilder
{
#region Private
internal readonly string _content;
internal static StringRebuilder Create(string source, int length, ILineBreaks lineBreaks)
{
return StringRebuilderForString.Create(source, lineBreaks, 0, length, 0, lineBreaks.Length);
}
internal static StringRebuilder Create(string source, ILineBreaks lineBreaks, int start, int length, int lineBreaksStart, int lineBreaksLength)
{
Debug.Assert(length != 0);
if (lineBreaksLength == 0)
return new StringRebuilderForString(source, LineBreakManager.Empty, start, length, 0, 0, source[start], source[start + length - 1]);
else
return new StringRebuilderForString(source, lineBreaks, start, length, lineBreaksStart, lineBreaksLength, source[start], source[start + length - 1]);
}
internal StringRebuilderForString()
: base(LineBreakManager.Empty, 0, 0, 0, 0, '\0', '\0')
{
_content = String.Empty;
}
private StringRebuilderForString(string source, ILineBreaks lineBreaks, int start, int length, int lineBreaksStart, int lineBreaksLength, char first, char last)
: base(lineBreaks, start, length, lineBreaksStart, lineBreaksLength, first, last)
{
_content = source;
}
#endregion
public override string ToString()
{
return _content.Substring(_textSpanStart, this.Length);
}
#region StringRebuilder Members
public override char this[int index]
{
get
{
if ((index < 0) || (index >= this.Length))
throw new ArgumentOutOfRangeException(nameof(index));
#if DEBUG
Interlocked.Increment(ref _totalCharactersReturned);
#endif
return _content[index + _textSpanStart];
}
}
public override string GetText(Span span)
{
#if DEBUG
Interlocked.Add(ref _totalCharactersReturned, span.Length);
#endif
return _content.Substring(span.Start + _textSpanStart, span.Length);
}
public override void CopyTo(int sourceIndex, char[] destination, int destinationIndex, int count)
{
#if DEBUG
Interlocked.Add(ref _totalCharactersCopied, count);
#endif
_content.CopyTo(sourceIndex + _textSpanStart, destination, destinationIndex, count);
}
public override void Write(TextWriter writer, Span span)
{
if (writer == null)
throw new ArgumentNullException(nameof(writer));
writer.Write(this.GetText(span));
}
public override StringRebuilder GetSubText(Span span)
{
if (span.End > this.Length)
throw new ArgumentOutOfRangeException(nameof(span));
if (span.Length == 0)
return StringRebuilder.Empty;
else if (span.Length == this.Length)
return this;
else
{
int firstLineNumber;
int lastLineNumber;
this.FindFirstAndLastLines(span, out firstLineNumber, out lastLineNumber);
return StringRebuilderForString.Create(_content, _lineBreaks, span.Start + _textSpanStart, span.Length, firstLineNumber, lastLineNumber - firstLineNumber);
}
}
#endregion
}
}
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