Data-oriented Construction System (#2152)

- Powerful
- Data-oriented
- Approved by PJB
- Powered by node graphs and AI pathfinding
- Coded by the same nerd who brought you atmos

Co-authored-by: Exp <theexp111@gmail.com>

Content.Server/Construction/Conditions/EntityAnchored.cs

@@ -0,0 +1,39 @@
+using System.Threading.Tasks;
+using Content.Shared.Construction;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects.Components;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Serialization;
+using Robust.Shared.Utility;
+
+namespace Content.Server.Construction.Conditions
+{
+    [UsedImplicitly]
+    public class EntityAnchored : IEdgeCondition
+    {
+        public bool Anchored { get; private set; }
+
+        public void ExposeData(ObjectSerializer serializer)
+        {
+            serializer.DataField(this, x => x.Anchored, "anchored", true);
+        }
+
+        public async Task<bool> Condition(IEntity entity)
+        {
+            if (!entity.TryGetComponent(out ICollidableComponent collidable)) return false;
+
+            return collidable.Anchored == Anchored;
+        }
+
+        public void DoExamine(IEntity entity, FormattedMessage message, bool inDetailsRange)
+        {
+            if (!entity.TryGetComponent(out ICollidableComponent collidable)) return;
+
+            if(Anchored && !collidable.Anchored)
+                message.AddMarkup("First, anchor it.\n");
+
+            if(!Anchored && collidable.Anchored)
+                message.AddMarkup("First, unanchor it.\n");
+        }
+    }
+}