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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.
//
using System.Globalization;
namespace Microsoft.VisualStudio.Text.Differencing
{
/// <summary>
/// Represents a single difference in the set of differences of two
/// lists of elements.
/// </summary>
/// <remarks>Each difference consists of a left span and a right span, either
/// of which may have zero length (that is, the operation may be an add operation or a delete operation).
/// The text before and after the difference matches.
/// In general, differencess are non-null. However, when the difference
/// appears at the beginning of the lists of differences, the "before" is null, and when the difference appears at
/// the end of the lists, the "after" is null.</remarks>
public class Difference
{
private Span left;
private Span right;
private Match before;
private Match after;
private DifferenceType type;
/// <summary>
/// Initializes a new instance of a <see cref="Difference"/> with the specified left and right spans and before and after matches.
/// </summary>
/// <param name="left">The left side of the difference (may have zero length).</param>
/// <param name="right">The right side of the difference (may have zero length).</param>
/// <param name="before">The non-differing element range before this difference.</param>
/// <param name="after">The non-differing element range after this difference.</param>
public Difference(Span left, Span right, Match before, Match after)
{
this.left = left;
this.right = right;
this.before = before;
this.after = after;
if (left.Length == 0)
type = DifferenceType.Add;
else if (right.Length == 0)
type = DifferenceType.Remove;
else
type = DifferenceType.Change;
}
/// <summary>
/// The left side of the difference (may be zero length).
/// </summary>
public Span Left
{
get { return left; }
}
/// <summary>
/// The right side of the difference (may be zero length).
/// </summary>
public Span Right
{
get { return right; }
}
/// <summary>
/// The match before this section. It is null at the beginning of
/// the sequence.
/// </summary>
public Match Before
{
get { return before; }
}
/// <summary>
/// The mtch after this difference. It is null at the end of the sequence.
/// </summary>
public Match After
{
get { return after; }
}
/// <summary>
/// The type of the difference (Add, Remove, or Change).
/// </summary>
public DifferenceType DifferenceType
{
get { return type; }
}
/// <summary>
/// The string representation of this difference.
/// </summary>
/// <returns></returns>
public override string ToString()
{
return string.Format(CultureInfo.CurrentCulture.NumberFormat, "(Difference; Type: {0}, Left count: {1}, Right count: {2}",
type, left.Length, right.Length);
}
/// <summary>
/// Determines whether two Difference objects are the same (have the same difference type and the same before and after matches).
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public override bool Equals(object obj)
{
Difference other = obj as Difference;
if (other != null)
{
return object.Equals(type, other.type) &&
object.Equals(before, other.before) && object.Equals(after, other.after) &&
object.Equals(left, other.left) && object.Equals(right, other.right);
}
return false;
}
/// <summary>
/// Serves as a hash code for this type.
/// </summary>
/// <returns></returns>
public override int GetHashCode()
{
return before.GetHashCode() << 24 ^ after.GetHashCode() << 16 ^
left.GetHashCode() << 8 ^ right.GetHashCode();
}
}
}
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