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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.
//
namespace Microsoft.VisualStudio.Text.Implementation
{
using System;
/// <summary>
/// Base class for a tracking position in a particular <see cref="ITextBuffer"/>.
/// </summary>
internal abstract partial class TrackingPoint : ITrackingPoint
{
#region State and Construction
protected readonly PointTrackingMode trackingMode;
protected TrackingPoint(ITextVersion version, int position, PointTrackingMode trackingMode)
{
if (version == null)
{
throw new ArgumentNullException("version");
}
if (position < 0 | position > version.Length)
{
throw new ArgumentOutOfRangeException("position");
}
if (trackingMode < PointTrackingMode.Positive || trackingMode > PointTrackingMode.Negative)
{
throw new ArgumentOutOfRangeException("trackingMode");
}
this.trackingMode = trackingMode;
}
#endregion
#region ITrackingPoint members
public abstract ITextBuffer TextBuffer { get; }
public PointTrackingMode TrackingMode
{
get { return this.trackingMode; }
}
public abstract TrackingFidelityMode TrackingFidelity { get; }
public int GetPosition(ITextVersion version)
{
if (version == null)
{
throw new ArgumentNullException("version");
}
if (version.TextBuffer != this.TextBuffer)
{
throw new ArgumentException(Strings.InvalidVersion);
}
return TrackPosition(version);
}
public int GetPosition(ITextSnapshot snapshot)
{
if (snapshot == null)
{
throw new ArgumentNullException("snapshot");
}
if (snapshot.TextBuffer != this.TextBuffer)
{
throw new ArgumentException(Strings.InvalidSnapshot);
}
return TrackPosition(snapshot.Version);
}
public SnapshotPoint GetPoint(ITextSnapshot snapshot)
{
return new SnapshotPoint(snapshot, GetPosition(snapshot));
}
public char GetCharacter(ITextSnapshot snapshot)
{
return GetPoint(snapshot).GetChar();
}
#endregion
protected abstract int TrackPosition(ITextVersion targetVersion);
#region Diagnostic Support
protected static string PointTrackingModeToString(PointTrackingMode trackingMode)
{
return trackingMode == PointTrackingMode.Positive ? "→" : "←";
}
protected static string ToString(ITextVersion version, int position, PointTrackingMode trackingMode)
{
return string.Format(System.Globalization.CultureInfo.CurrentCulture, "V{0} {2}@{1}",
version.VersionNumber, position, PointTrackingModeToString(trackingMode));
}
#endregion
}
}
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