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using System;
using System.Collections.Generic;
using Microsoft.VisualStudio.Text.Utilities;
namespace Microsoft.VisualStudio.Text.Implementation
{
public static class LineBreakManager
{
public readonly static ILineBreaks Empty = new ShortLineBreaksEditor(0);
public static ILineBreaksEditor CreateLineBreakEditor(int maxLength, int initialCapacity = 0)
{
return (maxLength < short.MaxValue)
? (ILineBreaksEditor)(new ShortLineBreaksEditor(initialCapacity))
: (ILineBreaksEditor)(new IntLineBreaksEditor(initialCapacity));
}
public static ILineBreaks CreateLineBreaks(string source)
{
ILineBreaksEditor lineBreaks = null;
int index = 0;
while (index < source.Length)
{
int breakLength = TextUtilities.LengthOfLineBreak(source, index, source.Length);
if (breakLength == 0)
{
++index;
}
else
{
if (lineBreaks == null)
lineBreaks = LineBreakManager.CreateLineBreakEditor(source.Length);
lineBreaks.Add(index, breakLength);
index += breakLength;
}
}
return lineBreaks ?? Empty;
}
private class ShortLineBreaksEditor : ILineBreaksEditor
{
private const ushort MaskForPosition = 0x7fff;
private const ushort MaskForLength = 0x8000;
private readonly static List<ushort> Empty = new List<ushort>(0);
private List<ushort> _lineBreaks = Empty;
public ShortLineBreaksEditor(int initialCapacity)
{
if (initialCapacity > 0)
_lineBreaks = new List<ushort>(initialCapacity);
}
public int Length => _lineBreaks.Count;
public int LengthOfLineBreak(int index)
{
return ((_lineBreaks[index] & MaskForLength) != 0 ? 2 : 1);
}
public int StartOfLineBreak(int index)
{
return (int)(_lineBreaks[index] & MaskForPosition);
}
public int EndOfLineBreak(int index)
{
int lineBreak = _lineBreaks[index];
return (lineBreak & MaskForPosition) +
(((lineBreak & MaskForLength) != 0) ? 2 : 1);
}
public void Add(int start, int length)
{
if ((start < 0) || (start > short.MaxValue))
throw new ArgumentOutOfRangeException(nameof(start));
if ((length < 1) || (length > 2))
throw new ArgumentOutOfRangeException(nameof(length));
if (_lineBreaks == Empty)
_lineBreaks = new List<ushort>();
if (length == 1)
_lineBreaks.Add((ushort)start);
else if (length == 2)
_lineBreaks.Add((ushort)(start | MaskForLength));
}
}
private class IntLineBreaksEditor : ILineBreaksEditor
{
private const uint MaskForPosition = 0x7fffffff;
private const uint MaskForLength = 0x80000000;
private readonly static List<uint> Empty = new List<uint>(0);
private List<uint> _lineBreaks = Empty;
public IntLineBreaksEditor(int initialCapacity)
{
if (initialCapacity > 0)
_lineBreaks = new List<uint>(initialCapacity);
}
public int Length => _lineBreaks.Count;
public int LengthOfLineBreak(int index)
{
return (_lineBreaks[index] & MaskForLength) != 0 ? 2 : 1;
}
public int StartOfLineBreak(int index)
{
return (int)(_lineBreaks[index] & MaskForPosition);
}
public int EndOfLineBreak(int index)
{
uint lineBreak = _lineBreaks[index];
return (int)((lineBreak & MaskForPosition) +
(((lineBreak & MaskForLength) != 0) ? 2 : 1));
}
public void Add(int start, int length)
{
if ((start < 0) || (start > int.MaxValue))
throw new ArgumentOutOfRangeException(nameof(start));
if ((length < 1) || (length > 2))
throw new ArgumentOutOfRangeException(nameof(length));
if (_lineBreaks == Empty)
_lineBreaks = new List<uint>();
if (length == 1)
_lineBreaks.Add((uint)start);
else if (length == 2)
_lineBreaks.Add((uint)(start | MaskForLength));
}
}
}
}
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