make projectile sprite sequences lint testable

OpenRA.Mods.Common/Lint/CheckSequences.cs

@@ -12,6 +12,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
+using OpenRA.GameRules;
 using OpenRA.Mods.Common.Traits;
 using OpenRA.Traits;
 
@@ -89,6 +90,48 @@ namespace OpenRA.Mods.Common.Lint
 						}
 					}
 				}
+
+				foreach (var weaponInfo in map.Rules.Weapons)
+				{
+					var projectileInfo = weaponInfo.Value.Projectile;
+					if (projectileInfo == null)
+						continue;
+
+					var fields = projectileInfo.GetType().GetFields();
+					foreach (var field in fields)
+					{
+						if (field.HasAttribute<SequenceReferenceAttribute>())
+						{
+							var sequences = LintExts.GetFieldValues(projectileInfo, field, emitError);
+							foreach (var sequence in sequences)
+							{
+								if (string.IsNullOrEmpty(sequence))
+									continue;
+
+								var sequenceReference = field.GetCustomAttributes<SequenceReferenceAttribute>(true).FirstOrDefault();
+								if (sequenceReference != null && !string.IsNullOrEmpty(sequenceReference.ImageReference))
+								{
+									var imageField = fields.FirstOrDefault(f => f.Name == sequenceReference.ImageReference);
+									if (imageField != null)
+									{
+										foreach (var imageOverride in LintExts.GetFieldValues(projectileInfo, imageField, emitError))
+										{
+											if (!string.IsNullOrEmpty(imageOverride))
+											{
+												var definitions = sequenceDefinitions.FirstOrDefault(n => n.Key == imageOverride.ToLowerInvariant());
+												if (definitions == null)
+													emitWarning("Can't find sequence definition for projectile image {0} at weapon {1}.".F(imageOverride, weaponInfo.Key));
+												else if (!definitions.Value.Nodes.Any(n => n.Key == sequence))
+													emitWarning("Projectile sprite image {0} from weapon {1} does not define sequence {2} from field {3} of {4}"
+														.F(imageOverride, weaponInfo.Key, sequence, field.Name, projectileInfo));
+											}
+										}
+									}
+								}
+							}
+						}
+					}
+				}
 			}
 		}