Properly parse code spans in md_in_html (#1069)

This reverts part of 2766698 and re-implements handling 
of tails in the same manner as the core.

Also, ensure line_offset doesn't raise an error on bad input
(see #1066) and properly handle script tags in code
spans (same as in the core).

Fixes #1068.

1 files changed, 66 insertions, 0 deletions

diff --git a/tests/test_syntax/extensions/test_md_in_html.py b/tests/test_syntax/extensions/test_md_in_html.py
index 824917c..7786b80 100644
--- a/tests/test_syntax/extensions/test_md_in_html.py
+++ b/tests/test_syntax/extensions/test_md_in_html.py
@@ -126,6 +126,72 @@ class TestMdInHTML(TestCase):
             )
         )
 
+    def test_md1_code_span(self):
+        self.assertMarkdownRenders(
+            self.dedent(
+                """
+                <div markdown="1">
+                `<h1>code span</h1>`
+                </div>
+                """
+            ),
+            self.dedent(
+                """
+                <div>
+                <p><code>&lt;h1&gt;code span&lt;/h1&gt;</code></p>
+                </div>
+                """
+            )
+        )
+
+    def test_md1_code_span_oneline(self):
+        self.assertMarkdownRenders(
+            '<div markdown="1">`<h1>code span</h1>`</div>',
+            self.dedent(
+                """
+                <div>
+                <p><code>&lt;h1&gt;code span&lt;/h1&gt;</code></p>
+                </div>
+                """
+            )
+        )
+
+    def test_md1_code_span_unclosed(self):
+        self.assertMarkdownRenders(
+            self.dedent(
+                """
+                <div markdown="1">
+                `<p>`
+                </div>
+                """
+            ),
+            self.dedent(
+                """
+                <div>
+                <p><code>&lt;p&gt;</code></p>
+                </div>
+                """
+            )
+        )
+
+    def test_md1_code_span_script_tag(self):
+        self.assertMarkdownRenders(
+            self.dedent(
+                """
+                <div markdown="1">
+                `<script>`
+                </div>
+                """
+            ),
+            self.dedent(
+                """
+                <div>
+                <p><code>&lt;script&gt;</code></p>
+                </div>
+                """
+            )
+        )
+
     def test_md1_div_blank_lines(self):
         self.assertMarkdownRenders(
             self.dedent(