Merge pull request #844 from snnz/fix-gridtables

Prevent GridTableParser from looking beyond the end of a line.

Author: xoofx

src/Markdig.Tests/MiscTests.cs

@@ -318,6 +318,26 @@ public void RootInlineInTableCellHasCorrectSourceSpan()
         Assert.That(paragraph.Inline.Span.End == paragraph.Inline.LastChild.Span.End);
     }
 
+    [Test]
+    public void TestGridTableShortLine()
+    {
+        var input = @"
++--+
+|  |
++-";
+
+        var expected = @"<table>
+<col style=""width:100%"" />
+<tbody>
+<tr>
+<td></td>
+</tr>
+</tbody>
+</table>
+";
+        TestParser.TestSpec(input, expected, new MarkdownPipelineBuilder().UseGridTables().Build());
+    }
+  
     [Test]
     public void TestDefinitionListInListItemWithBlankLine()
     {

src/Markdig/Extensions/Tables/GridTableParser.cs

@@ -135,14 +135,15 @@ private BlockState HandleNewRow(BlockProcessor processor, GridTableState tableSt
     private static void SetRowSpanState(List<GridTableState.ColumnSlice> columns, StringSlice line, out bool isHeaderRow, out bool hasRowSpan)
     {
         var lineStart = line.Start;
+        var lineEnd = line.End;
         isHeaderRow = line.PeekChar() == '=' || line.PeekChar(2) == '=';
         hasRowSpan = false;
         foreach (var columnSlice in columns)
         {
             if (columnSlice.CurrentCell != null)
             {
                 line.Start = lineStart + columnSlice.Start + 1;
-                line.End = lineStart + columnSlice.End - 1;
+                line.End = Math.Min(lineStart + columnSlice.End - 1, lineEnd);
                 line.Trim();
                 if (line.IsEmptyOrWhitespace() || !IsRowSeparator(line))
                 {