Support Checks for Unordered Chapters

USFMToolsSharp.Linter/LinterModules/UnorderedChapters.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using USFMToolsSharp.Linter.LinterModules;
+using USFMToolsSharp.Linter.Models;
+using USFMToolsSharp.Models.Markers;
+
+namespace USFMToolsSharp.Linter.LinterModules
+{
+    public class UnorderedChapters : ILinterModule
+    {
+        public List<LinterResult> Lint(USFMDocument input)
+        {
+            List<int> chapterIndecies = new List<int>();
+            List<LinterResult> results = new List<LinterResult>();
+            foreach (Marker marker in input.Contents)
+            {
+                if (marker is CMarker)
+                {
+                    int chapIndex = ((CMarker)marker).Number;
+                    if (chapterIndecies.Count != 0)
+                    {
+                        if (chapIndex != chapterIndecies[chapterIndecies.Count - 1] + 1)
+                        {
+                            results.Add(new LinterResult
+                            {
+                                Position = marker.Position,
+                                Level = LinterLevel.Error,
+                                Message = $"Chapter {chapIndex} is not in the correct order."
+                            });
+                        }
+                    }
+
+                    chapterIndecies.Add(((CMarker)marker).Number);
+                }
+                if (marker is IDMarker)
+                {
+                    chapterIndecies.Clear();
+                }
+            }
+            return results;
+        }
+    }
+}

USFMToolsSharp.Linter/USFMLinter.cs

@@ -14,7 +14,8 @@ public class USFMLinter
             new VerseMarkerValidation(),
             new MissingEndMarkers(),
             new UnpairedEndMarkers(),
-            new MissingTableRows()
+            new MissingTableRows(),
+            new UnorderedChapters()
         };
         public List<LinterResult> Lint(USFMDocument input)
         {