/// <summary>
/// Renders an arrow between two participants.
/// </summary>
/// <remarks>
/// Takes scope (if/alt/group/etc.) into account for correctly close activation lines.
/// </remarks>
private static void RenderArrow(StringBuilder stringBuilder, Arrow arrow, IReadOnlyList <InteractionFragment> scope, Interactions tree, List <string> activations)
{
var target = (arrow.Source != "W" && arrow.Target == "A") ? "Q" : arrow.Target;
stringBuilder.Arrow(arrow.Source, $"-{arrow.Color}>", target, label: arrow.Name);
if (!activations.Contains(arrow.Source))
{
// Scope was activated in current scope
if (arrow.Target != "]" && arrow.Source != "A" && arrow.Source != "W" && !arrow.Source.StartsWith("x ", StringComparison.Ordinal) && scope.Descendants <Arrow>().Last(a => a.Source == arrow.Source) == arrow && arrow.Source != arrow.Target)
{
// This is the last arrow from this source
stringBuilder.Deactivate(arrow.Source);
activations.Remove(arrow.Source);
}
}
if (!activations.Contains(arrow.Target))
{
// Scope was not activated by the parent scope
if ((arrow.Target != "A" || arrow.Source == "W") && arrow.Target != "Q" && arrow.Target != "W" && !arrow.Target.StartsWith("x ", StringComparison.Ordinal) && arrow.Source != arrow.Target && scope.OfType <Arrow>().First(a => a.Target == arrow.Target) == arrow)
{
var previousArrows = arrow.Ancestors().SelectMany(a => a.StatementsBeforeSelf()).OfType <Arrow>().ToList();
if (!previousArrows.Any(a => a.Target == arrow.Target) && !ExternalTargets.Contains(arrow.Target))
{
// There was no earlier activation in the current scope
stringBuilder.Activate(arrow.Target);
activations.Add(arrow.Target);
}
}
}
}