/// <summary>
/// Create a Side-by-side map for the given snapshot difference. Note that only side-by-side line maps are supported
/// (character maps -- needed for word wrap -- will require a different approach since even "matches" could have different
/// lengths if ignore white space is turned on).
/// </summary>
public SideBySideMap(ISnapshotDifference difference)
{
Requires.NotNull(difference, nameof(difference));
this.Difference = difference;
// Calculate the effective document "length" (where the length of each diff block
// is the maximum of the right & left diffs) and store it for each diff.
//
// This code assumes word wrap is off. If it is on, we need to use the characters in each block.
_sideBySideEndAtDiff = new List <int>(difference.LineDifferences.Differences.Count);
var leftEnd = 0;
var rightEnd = 0;
var sideBySideEnd = 0;
for (int i = 0; (i < difference.LineDifferences.Differences.Count); ++i)
{
var diff = difference.LineDifferences.Differences[i];
int newLeftEnd = diff.Left.End;
int newRightEnd = diff.Right.End;
var leftDelta = newLeftEnd - leftEnd;
var rightDelta = newRightEnd - rightEnd;
sideBySideEnd += Math.Max(leftDelta, rightDelta);
_sideBySideEndAtDiff.Add(sideBySideEnd);
leftEnd = newLeftEnd;
rightEnd = newRightEnd;
}
// Since we're in a match, (current.RightBufferSnapshot.LineCount - rightEnd) == current.LeftBufferSnapshot.LineCount - leftEnd
this.SideBySideLength = sideBySideEnd + difference.RightBufferSnapshot.LineCount - rightEnd;
}
/// <summary>
/// Create a change event from the given before and after <see cref="ISnapshotDifference"/>s.
/// </summary>
/// <param name="before">The <see cref="ISnapshotDifference"/> before the change (may be <c>null</c>).</param>
/// <param name="after">The <see cref="ISnapshotDifference"/> after the change.</param>
public SnapshotDifferenceChangeEventArgs(ISnapshotDifference before, ISnapshotDifference after)
{
Before = before; After = after;
}
