From 50ba72c7606ed6832a9ace0d6c3262dc99a9085d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADt=20Novotn=C3=BD?= <witiko@mail.muni.cz>
Date: Sun, 18 Dec 2016 18:46:36 +0100
Subject: [PATCH] The inline code lexer now copes with internal backticks.

---
 src/pygments_markdown_lexer/lexer.py | 8 +++-----
 src/tests/test_lexer.py              | 8 ++++++++
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/pygments_markdown_lexer/lexer.py b/src/pygments_markdown_lexer/lexer.py
index 33a8079..a4a468b 100644
--- a/src/pygments_markdown_lexer/lexer.py
+++ b/src/pygments_markdown_lexer/lexer.py
@@ -35,6 +35,7 @@ class Markdown(object):
     Markup = Keyword
     Heading = Generic.Heading
     SubHeading = Generic.Heading
+    InlineCode = Token.Literal.String.Backtick
     CodeBlock = Comment.Preproc
     HtmlSingle = Comment.Single
     HtmlBlock = Comment.Preproc
@@ -112,7 +113,8 @@ class MarkdownLexer(RegexLexer):
             (r'&', Text),
 
             # Inline code
-            (r'``?', Markdown.Markup, state('literal')),
+            (r'(`+) ?(.*?) ?(\1)',
+             bygroups(Markdown.Markup, Markdown.InlineCode, Markdown.Markup)),
 
             # Emphasis
             (r'_?_[ \n]', Text),  # whitespace escape
@@ -141,10 +143,6 @@ class MarkdownLexer(RegexLexer):
             (r'[a-zA-Z0-9]+', Text),  # optimize normal words a little
             (r'.', Text),  # default fallback
         ],
-        state('literal'): [
-            (r'[^`]+', String.Backtick),
-            (r'(?<!\\)``?' + end_string_suffix, Markdown.Markup, state('#pop')),
-        ],
         state('htmlblock'): [  # TODO: delegate to HTML lexer
             (r'^</[^>]+>\n', Markdown.HtmlBlock, state('#pop')),
             (r'.*\n', Markdown.HtmlBlock),  # slurp boring text
diff --git a/src/tests/test_lexer.py b/src/tests/test_lexer.py
index f0074d8..47f8cda 100644
--- a/src/tests/test_lexer.py
+++ b/src/tests/test_lexer.py
@@ -229,3 +229,11 @@ def test_lists_and_blockquotes():
             (Markdown.Markup, '\t' + lead + ' '),
             (Text, 'Lorem ipsum.\n'),
         )
+
+def test_inline_code():
+    check(
+        (Markdown.Markup, r'``'),
+        (Markdown.InlineCode, 'There is a literal backtick (`) here.'),
+        (Markdown.Markup, r'``'),
+        (Text, '\n'),
+    )