Add a lint check for invalid integer expression syntax.

OpenRA.Mods.Common/Lint/CheckChromeIntegerExpressions.cs

@@ -0,0 +1,54 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using OpenRA.Support;
+
+namespace OpenRA.Mods.Common.Lint
+{
+	class CheckChromeIntegerExpressions : ILintPass
+	{
+		public void Run(Action<string> emitError, Action<string> emitWarning, ModData modData)
+		{
+			foreach (var filename in modData.Manifest.ChromeLayout)
+				CheckInner(MiniYaml.FromStream(modData.DefaultFileSystem.Open(filename), filename), filename, emitError);
+		}
+
+		void CheckInner(List<MiniYamlNode> nodes, string filename, Action<string> emitError)
+		{
+			var substitutions = new Dictionary<string, int>();
+			var readOnlySubstitutions = new ReadOnlyDictionary<string, int>(substitutions);
+
+			foreach (var node in nodes)
+			{
+				if (node.Value == null)
+					continue;
+
+				if (node.Key == "X" || node.Key == "Y" || node.Key == "Width" || node.Key == "Height")
+				{
+					try
+					{
+						FieldLoader.GetValue<IntegerExpression>(node.Key, node.Value.Value);
+					}
+					catch (YamlException e)
+					{
+						emitError($"Failed to parse integer expression in {node}: {e.Message}");
+					}
+				}
+
+				if (node.Value.Nodes != null)
+					CheckInner(node.Value.Nodes, filename, emitError);
+			}
+		}
+	}
+}