Merge pull request #736 from zickb/better_literal_delimiter_content_string_slice

Better literal delimiter content string slice

src/Markdig.Tests/TestEmphasisPlus.cs

@@ -1,7 +1,10 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
-// This file is licensed under the BSD-Clause 2 license. 
+// This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
 
+using Markdig.Syntax;
+using Markdig.Syntax.Inlines;
+
 namespace Markdig.Tests;
 
 [TestFixture]
@@ -18,4 +21,17 @@ public partial class TestEmphasisPlus
     {
         TestParser.TestSpec("normal ***Strong emphasis*** normal", "<p>normal <em><strong>Strong emphasis</strong></em> normal</p>", "");
     }
+
+    [Test]
+    public void OpenEmphasisHasConvenientContentStringSlice()
+    {
+        var pipeline = new MarkdownPipelineBuilder().Build();
+
+        var document = Markdown.Parse("test*test", pipeline);
+
+        var emphasisDelimiterLiteral = (LiteralInline)((ParagraphBlock)document.LastChild).Inline.ElementAt(1);
+        Assert.That(emphasisDelimiterLiteral.Content.Text == "test*test");
+        Assert.That(emphasisDelimiterLiteral.Content.Start == 4);
+        Assert.That(emphasisDelimiterLiteral.Content.End == 4);
+    }
 }

src/Markdig/Parsers/Inlines/EmphasisInlineParser.cs

@@ -1,5 +1,5 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
-// This file is licensed under the BSD-Clause 2 license. 
+// This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
 
 using System.Diagnostics;
@@ -109,7 +109,7 @@ public class EmphasisInlineParser : InlineParser, IPostInlineProcessor
         var child = container.FirstChild;
         while (child != null)
         {
-            // Stop the search on the delimitation child 
+            // Stop the search on the delimitation child
             if (child == lastChild)
             {
                 break;
@@ -197,7 +197,7 @@ public class EmphasisInlineParser : InlineParser, IPostInlineProcessor
             if (canOpen) delimiterType |= DelimiterType.Open;
             if (canClose) delimiterType |= DelimiterType.Close;
 
-            var delimiter = new EmphasisDelimiterInline(this, emphasisDesc)
+            var delimiter = new EmphasisDelimiterInline(this, emphasisDesc, new StringSlice(slice.Text, startPosition, slice.Start - 1))
             {
                 DelimiterCount = delimiterCount,
                 Type = delimiterType,
@@ -221,7 +221,7 @@ public class EmphasisInlineParser : InlineParser, IPostInlineProcessor
 
         // TODO: Benchmark difference between using List and LinkedList here since there could be a few Remove calls
 
-        // Move current_position forward in the delimiter stack (if needed) until 
+        // Move current_position forward in the delimiter stack (if needed) until
         // we find the first potential closer with delimiter * or _. (This will be the potential closer closest to the beginning of the input – the first one in parse order.)
         for (int i = 0; i < delimiters.Count; i++)
         {
@@ -237,7 +237,7 @@ public class EmphasisInlineParser : InlineParser, IPostInlineProcessor
             {
                 while (true)
                 {
-                    // Now, look back in the stack (staying above stack_bottom and the openers_bottom for this delimiter type) 
+                    // Now, look back in the stack (staying above stack_bottom and the openers_bottom for this delimiter type)
                     // for the first matching potential opener (“matching” means same delimiter).
                     EmphasisDelimiterInline? openDelimiter = null;
                     int openDelimiterIndex = -1;
@@ -307,8 +307,10 @@ public class EmphasisInlineParser : InlineParser, IPostInlineProcessor
                         emphasis.Column = openDelimiter.Column;
                         emphasis.Span.End = closeDelimiter.Span.End - closeDelimitercount + delimiterDelta;
 
+                        openDelimiter.Content.Start += delimiterDelta;
                         openDelimiter.Span.Start += delimiterDelta;
                         openDelimiter.Column += delimiterDelta;
+                        closeDelimiter.Content.Start += delimiterDelta;
                         closeDelimiter.Span.Start += delimiterDelta;
                         closeDelimiter.Column += delimiterDelta;
 
@@ -331,7 +333,7 @@ public class EmphasisInlineParser : InlineParser, IPostInlineProcessor
                         for (int k = i - 1; k >= openDelimiterIndex + 1; k--)
                         {
                             var literalDelimiter = delimiters[k];
-                            literalDelimiter.ReplaceBy(literalDelimiter.AsLiteralInline());                                
+                            literalDelimiter.ReplaceBy(literalDelimiter.AsLiteralInline());
                             delimiters.RemoveAt(k);
                             i--;
                         }

src/Markdig/Syntax/Inlines/EmphasisDelimiterInline.cs

@@ -1,5 +1,5 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
-// This file is licensed under the BSD-Clause 2 license. 
+// This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
 
 using Markdig.Helpers;
@@ -27,6 +27,24 @@ public class EmphasisDelimiterInline : DelimiterInline
 
         Descriptor = descriptor;
         DelimiterChar = descriptor.Character;
+        Content = new StringSlice(ToLiteral());
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="EmphasisDelimiterInline" /> class.
+    /// </summary>
+    /// <param name="parser">The parser.</param>
+    /// <param name="descriptor">The descriptor.</param>
+    /// <param name="content">The content.</param>
+    /// <exception cref="ArgumentNullException"></exception>
+    internal EmphasisDelimiterInline(InlineParser parser, EmphasisDescriptor descriptor, StringSlice content) : base(parser)
+    {
+        if (descriptor is null)
+            ThrowHelper.ArgumentNullException(nameof(descriptor));
+
+        Descriptor = descriptor;
+        DelimiterChar = descriptor.Character;
+        Content = content;
     }
 
     /// <summary>
@@ -44,6 +62,11 @@ public class EmphasisDelimiterInline : DelimiterInline
     /// </summary>
     public int DelimiterCount { get; set; }
 
+    /// <summary>
+    /// The content as a <see cref="StringSlice"/>.
+    /// </summary>
+    public StringSlice Content;
+
     public override string ToLiteral()
     {
         return DelimiterCount > 0 ? new string(DelimiterChar, DelimiterCount) : string.Empty;
@@ -53,7 +76,7 @@ public class EmphasisDelimiterInline : DelimiterInline
     {
         return new LiteralInline()
         {
-            Content = new StringSlice(ToLiteral()),
+            Content = Content,
             IsClosed = true,
             Span = Span,
             Line = Line,