Implement dislodge/hold assertions

MultiversalDiplomacy/Script/AdjudicationQueryScriptHandler.cs

@@ -121,7 +121,41 @@ public class AdjudicationQueryScriptHandler(
 
             case "holds":
             case "dislodged":
-                return ScriptResult.Fail($"Unknown assertion \"{args[0]}\"", this);
+                re = new(World);
+                prov = new($"^{re.FullLocation}$", RegexOptions.IgnoreCase);
+                match = prov.Match(args[1]);
+                if (!match.Success) return ScriptResult.Fail($"Could not parse province from \"{args[1]}\"", this);
+
+                timeline = match.Groups[1].Length > 0
+                    ? match.Groups[1].Value
+                    : Season.First.Timeline;
+                seasonsInTimeline = World.Timelines.Seasons.Where(season => season.Timeline == timeline);
+                if (!seasonsInTimeline.Any()) return ScriptResult.Fail($"No seasons in timeline {timeline}", this);
+                
+                turn = match.Groups[4].Length > 0
+                    ? int.Parse(match.Groups[4].Value)
+                    // If turn is unspecified, use the second-latest turn in the timeline,
+                    // since we want to assert against the subjects of the orders just adjudicated,
+                    // and adjudication created a new set of seasons.
+                    : seasonsInTimeline.Max(season => season.Turn) - 1;
+                season = new(timeline, turn);
+
+                province = World.Map.Provinces.Single(province => province.Is(match.Groups[2].Value));
+
+                var matchingDislodges = Adjudications.Where(adj
+                    => adj is IsDislodged dislodge
+                    && dislodge.Order.Unit.Season == season
+                    && World.Map.GetLocation(dislodge.Order.Unit.Location).ProvinceName == province.Name);
+                if (!matchingDislodges.Any()) return ScriptResult.Fail("No matching dislodge decisions");
+                var isDislodged = matchingDislodges.Cast<IsDislodged>().First();
+
+                if (args[0] == "holds" && isDislodged.Outcome != false) {
+                    return ScriptResult.Fail($"Adjudication {isDislodged} is true");
+                }
+                if (args[0] == "dislodged" && isDislodged.Outcome != true) {
+                    return ScriptResult.Fail($"Adjudication {isDislodged} is false");
+                }
+                return ScriptResult.Succeed(this);
 
             case "moves":
             case "no-move":