private static IResolved <T> ResolveConflict <T>(Insert <T> a, IChange <T> b)
{
switch (b)
{
case Delete <T> delete:
if (delete.OldRange.Contains(a.OldRange, includeStart: false))
{
return(Resolved.AsConflict(delete, a, "[B] is deleting text that [A] is inserting into."));
}
else
{
return(Resolved.AsNoMerge(delete, a));
}
case Insert <T> insert:
if (a.NewRange.Start == insert.NewRange.Start)
{
if (a.Value.Equals(insert.Value))
{
return(Resolved.AsMerge(a, insert, a));
}
else
{
return(Resolved.AsConflict(a, insert, "[A] && [B] are inserting text at the same location."));
}
}
else
{
return(Resolved.AsNoMerge(a, insert));
}
default:
throw new ArgumentException($"Unknown change type: {b.GetType().Name}.");
}
}
private static IResolved <T> ResolveConflict <T>(Delete <T> a, IChange <T> b)
{
switch (b)
{
case Delete <T> delete:
if (a.OldRange.OverlapsWith(delete.OldRange))
{
var value = a.Value;
var range = Range.Join(a.OldRange, delete.OldRange);
var newDelete = new Delete <T>
(
value: a.Value,
deletedRange: Range.Join(a.OldRange, delete.OldRange),
newPosition: a.NewRange.Start
);
return(Resolved.AsMerge(a, delete, newDelete));
}
else
{
return(Resolved.AsNoMerge(a, delete));
}
case Insert <T> insert:
if (a.OldRange.Contains(insert.OldRange, includeStart: false))
{
return(Resolved.AsConflict(a, insert, "[A] is deleting text that [B] is inserting into."));
}
else
{
return(Resolved.AsNoMerge(a, insert));
}
default:
throw new ArgumentException($"Unknown change type: {b.GetType().Name}.");
}
}