Implement support-move parsing

MultiversalDiplomacy/Model/OrderParser.cs

@@ -370,9 +370,60 @@ public class OrderParser(World world)
     {
         order = null;
         var support = ParseSupportMove(match);
-        throw new NotImplementedException();
 
-        // It is possible to support a move to an inaccessible coast if another coast is accessible to the subject.
-        // DATC 4.B.4 prefers that automatic adjudicators strictly require matching coasts in supports.
+        if (!TryParseOrderSubject(world, support.timeline, support.turn, support.province, out Unit? subject)) {
+            return false;
+        }
+
+        if (!TryParseOrderSubject(
+            world, support.targetTimeline, support.targetTurn, support.targetProvince, out Unit? target))
+        {
+            return false;
+        }
+
+        string destTimeline = support.destTimeline.Length > 0
+            ? support.destTimeline
+            // If the destination is unspecified, use the target's
+            : target.Season.Timeline;
+
+        int destTurn = support.destTurn.Length > 0
+            ? int.Parse(support.destTurn)
+            // If the destination is unspecified, use the unit's
+            : target.Season.Turn;
+
+        var destProvince = world.Map.Provinces.Single(province => province.Is(support.destProvince));
+
+        // DATC 4.B.6 requires that "irrelevant" locations like army to Spain nc be ignored.
+        // To satisfy this, any location of the wrong type is categorically ignored, so for an army the
+        // "north coast" location effectively doesn't exist here.
+        // Note that target is used instead of subject, since it is possible to support a move to an inaccessible
+        // coast as long as the subject can reach the province and the target can reach the location.
+        var unitLocations = destProvince.Locations.Where(loc => loc.Type switch {
+            LocationType.Land => target.Type == UnitType.Army,
+            LocationType.Water => target.Type == UnitType.Fleet,
+            _ => false,
+        });
+        // DATC 4.6.B also requires that unknown coasts be ignored. To satisfy this, an additional filter by name.
+        // Doing both of these filters means "A - Spain/nc" is as meaningful as "F - Spain/wc".
+        var matchingLocations = unitLocations.Where(loc => loc.Is(support.destLocation));
+
+        // If one location matched, use that location. If the coast is inaccessible to the target, the order will
+        // be invalidated by a path check later to satisfy DATC 4.B.3.
+        string? destLocationKey = matchingLocations.FirstOrDefault(defaultValue: null)?.Key;
+
+        if (destLocationKey is null) {
+            // If no location matched, location was omitted, nonexistent, or the wrong type.
+            // If one location is accessible, DATC 4.B.2 requires that it be used.
+            // If more than one location is accessible, DATC 4.B.1 requires the order fail.
+
+            // TODO check which locations are accessible per the above
+            destLocationKey = unitLocations.First().Key;
+
+            // return false;
+        }
+
+        var destLocation = world.Map.GetLocation(destLocationKey);
+        order = new SupportMoveOrder(power, subject, target, new(destTimeline, destTurn), destLocation);
+        return true;
     }
 }

MultiversalDiplomacy/Script/AdjudicationQueryScriptHandler.cs

@@ -120,10 +120,8 @@ public class AdjudicationQueryScriptHandler(
                 return ScriptResult.Succeed(this);
 
             case "holds":
-                // Assert a unit successfully held
-
             case "dislodged":
-                // Assert a unit was dislodged
+                return ScriptResult.Fail($"Unknown assertion \"{args[0]}\"", this);
 
             case "moves":
             case "no-move":
@@ -163,11 +161,9 @@ public class AdjudicationQueryScriptHandler(
                 }
                 return ScriptResult.Succeed(this);
 
-            case "supports":
-                // Assert a unit's support was given
-
-            case "cut":
-                // Assert a unit's support was cut
+            case "support-given":
+            case "support-cut":
+                return ScriptResult.Fail($"Unknown assertion \"{args[0]}\"", this);
 
             default:
                 return ScriptResult.Fail($"Unknown assertion \"{args[0]}\"", this);

MultiversalDiplomacyTests/ReplDriver.cs

@@ -17,7 +17,7 @@ public class ReplDriver(IScriptHandler initialHandler, bool echo = false)
 
     public ReplDriver ExecuteAll(string multiline)
     {
-        var lines = multiline.Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+        var lines = multiline.Split('\n', StringSplitOptions.TrimEntries);
         return lines.Aggregate(this, (repl, line) => repl.Execute(line));
     }
 

MultiversalDiplomacyTests/ReplTest.cs

@@ -191,10 +191,44 @@ public class ReplTest
         repl.AssertFails("assert support-given Mun");
     }
 
+    [Test]
+    public void AssertSupportMove()
+    {
+        var repl = StandardRepl();
+
+        repl.ExecuteAll("""
+        unit Germany A Berlin
+        unit Germany A Bohemia
+        unit Austria A Tyrolia
+        ---
+        Germany:
+        Berlin - Silesia
+        Bohemia s Berlin - Silesia
+        ---
+        """);
+
+        // Support is given
+        repl.Execute("assert support-given Boh");
+        repl.AssertFails("assert support-cut Boh");
+
+        repl.ExecuteAll("""
+        ---
+        Germany:
+        Silesia - Munich
+        Bohemia s Silesia - Munich
+
+        Austria Tyrolia - Bohemia
+        ---
+        """);
+
+        // Support is cut
+        repl.AssertFails("assert support-given Boh");
+        repl.Execute("assert support-cut Boh");
+    }
+
     [Test]
     public void AssertDislodged()
     {
-        Assert.Ignore();
         var repl = StandardRepl();
 
         repl.ExecuteAll("""
@@ -203,60 +237,22 @@ public class ReplTest
         unit Austria A Tyr
         ---
         Germany Mun - Tyr
+        ---
+        """);
+
+        // Move repelled
+        repl.Execute("assert holds Tyr");
+        repl.AssertFails("assert dislodged Tyr");
+
+        repl.ExecuteAll("""
+        ---
+        Germany Mun - Tyr
         Germany Boh s Mun - Tyr
         ---
         """);
 
-        // Assertion should pass for a dislodge
+        // Move succeeds
         repl.Execute("assert dislodged Tyr");
-        // Assertion should fail for a repelled move
         repl.AssertFails("assert holds Tyr");
     }
-
-    [Test]
-    public void AssertSupports()
-    {
-        Assert.Ignore();
-        var repl = StandardRepl();
-
-        repl.ExecuteAll("""
-        unit Germany A Mun
-        unit Germany A Boh
-        unit Austria A Tyr
-        ---
-        Germany:
-        Mun - Tyr
-        Boh s Mun - Tyr
-        ---
-        """);
-
-        // `supports` and `cut` are opposites
-        repl.Execute("assert supports Boh");
-        repl.AssertFails("assert cut Boh");
-    }
-
-    [Test]
-    public void AssertCutSupport()
-    {
-        Assert.Ignore();
-        var repl = StandardRepl();
-
-        repl.ExecuteAll("""
-        unit Germany A Mun
-        unit Germany A Boh
-        unit Austria A Tyr
-        unit Italy A Vienna
-        ---
-        Germany:
-        Mun - Tyr
-        Boh s Mun - Tyr
-
-        Italy Vienna - Boh
-        ---
-        """);
-
-        // `supports` and `cut` are opposites
-        repl.Execute("assert cut Boh");
-        repl.AssertFails("assert supports Boh");
-    }
 }