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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.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Threading;
namespace Microsoft.VisualStudio.Text.Implementation
{
internal abstract class UnaryStringRebuilder : StringRebuilder
{
internal readonly ILineBreaks _lineBreaks;
#if DEBUG
private static int _totalCreated = 0;
public static int TotalCreated { get { return _totalCreated; } }
#endif
protected readonly int _textSpanStart; //subspan of _storage contained in this StringRebuilderForChars
protected readonly int _lineBreakSpanStart; //subspan of _storage.LineBreaks that contains all line breaks in this StringRebuilderForChars
protected int TextSpanEnd { get { return _textSpanStart + this.Length; } }
protected int LineBreakSpanEnd { get { return _lineBreakSpanStart + this.LineBreakCount; } }
protected UnaryStringRebuilder(ILineBreaks lineBreaks, int start, int length, int linebreaksStart, int linebreaksLength, char first, char last)
: base(length, linebreaksLength, first, last)
{
#if DEBUG
Interlocked.Increment(ref _totalCreated);
#endif
_lineBreaks = lineBreaks;
_textSpanStart = start;
_lineBreakSpanStart = linebreaksStart;
}
internal void FindFirstAndLastLines(Span span, out int firstLineNumber, out int lastLineNumber)
{
firstLineNumber = this.GetLineNumberFromPosition(span.Start) + _lineBreakSpanStart;
lastLineNumber = this.GetLineNumberFromPosition(span.End) + _lineBreakSpanStart;
//Handle the special case where the end position falls in the middle of a linebreak.
if ((lastLineNumber < this.LineBreakSpanEnd) &&
(span.End > _lineBreaks.StartOfLineBreak(lastLineNumber) - _textSpanStart))
{
++lastLineNumber;
}
}
#region StringRebuilder Members
public override int GetLineNumberFromPosition(int position)
{
if ((position < 0) || (position > this.Length))
throw new ArgumentOutOfRangeException("position");
//Convert position to a position relative to the start of _text.
if (position == this.Length)
{
//Handle positions at the end of the span as a special case since otherwise we
//return the incorrect value if the last line break extends past the end of _textSpan.
return this.LineBreakCount;
}
position += _textSpanStart;
int start = _lineBreakSpanStart;
int end = this.LineBreakSpanEnd;
while (start < end)
{
int middle = (start + end) / 2;
if (position < _lineBreaks.EndOfLineBreak(middle))
end = middle;
else
start = middle + 1;
}
return start - _lineBreakSpanStart;
}
public override void GetLineFromLineNumber(int lineNumber, out Span extent, out int lineBreakLength)
{
if ((lineNumber < 0) || (lineNumber > this.LineBreakCount))
throw new ArgumentOutOfRangeException("lineNumber");
int absoluteLineNumber = _lineBreakSpanStart + lineNumber;
int start = (lineNumber == 0)
? 0
: (Math.Min(this.TextSpanEnd, _lineBreaks.EndOfLineBreak(absoluteLineNumber - 1)) - _textSpanStart);
int end;
if (lineNumber < this.LineBreakCount)
{
end = Math.Max(_textSpanStart, _lineBreaks.StartOfLineBreak(absoluteLineNumber));
lineBreakLength = Math.Min(this.TextSpanEnd, _lineBreaks.EndOfLineBreak(absoluteLineNumber)) - end;
end -= _textSpanStart;
}
else
{
end = this.Length;
lineBreakLength = 0;
}
extent = Span.FromBounds(start, end);
}
public override StringRebuilder GetLeaf(int position, out int offset)
{
offset = 0;
return this;
}
protected char GetChar(char[] content, int index)
{
if ((index < 0) || (index >= this.Length))
throw new ArgumentOutOfRangeException("index");
#if DEBUG
Interlocked.Increment(ref _totalCharactersReturned);
#endif
return content[index + _textSpanStart];
}
protected string GetText(char[] content, Span span)
{
if (span.End > this.Length)
throw new ArgumentOutOfRangeException("span");
#if DEBUG
Interlocked.Add(ref _totalCharactersReturned, span.Length);
#endif
return new string(content, span.Start + _textSpanStart, span.Length);
}
protected void CopyTo(char[] content, int sourceIndex, char[] destination, int destinationIndex, int count)
{
if (sourceIndex < 0)
throw new ArgumentOutOfRangeException("sourceIndex");
if (destination == null)
throw new ArgumentNullException("destination");
if (destinationIndex < 0)
throw new ArgumentOutOfRangeException("destinationIndex");
if (count < 0)
throw new ArgumentOutOfRangeException("count");
if ((sourceIndex + count > this.Length) || (sourceIndex + count < 0))
throw new ArgumentOutOfRangeException("count");
if ((destinationIndex + count > destination.Length) || (destinationIndex + count < 0))
throw new ArgumentOutOfRangeException("count");
#if DEBUG
Interlocked.Add(ref _totalCharactersCopied, count);
#endif
Array.Copy(content, sourceIndex + _textSpanStart, destination, destinationIndex, count);
}
protected void Write(char[] content, TextWriter writer, Span span)
{
if (writer == null)
throw new ArgumentNullException("writer");
if (span.End > this.Length)
throw new ArgumentOutOfRangeException("span");
writer.Write(content, span.Start + _textSpanStart, span.Length);
}
public override StringRebuilder Child(bool rightSide)
{
throw new InvalidOperationException();
}
#endregion
}
}
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