From 4cf9da363ea6601e3d537b78306839b0b6c2bb19 Mon Sep 17 00:00:00 2001
From: Bryan Ho <hob@wycliffeassociates.org>
Date: Wed, 14 Aug 2019 18:47:54 -0400
Subject: [PATCH] Support Unordered Chapters

---
 .../LinterModules/UnorderedChapters.cs        | 44 +++++++++++++++++++
 USFMToolsSharp.Linter/USFMLinter.cs           |  3 +-
 2 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 USFMToolsSharp.Linter/LinterModules/UnorderedChapters.cs

diff --git a/USFMToolsSharp.Linter/LinterModules/UnorderedChapters.cs b/USFMToolsSharp.Linter/LinterModules/UnorderedChapters.cs
new file mode 100644
index 0000000..160a7d3
--- /dev/null
+++ b/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;
+        }
+    }
+}
\ No newline at end of file
diff --git a/USFMToolsSharp.Linter/USFMLinter.cs b/USFMToolsSharp.Linter/USFMLinter.cs
index 0a2e3b6..a7326e7 100644
--- a/USFMToolsSharp.Linter/USFMLinter.cs
+++ b/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)
         {