when computing <ol><li> numbering, ignore non-<li> previous siblings (#183)

Signed-off-by: chrispy <chrispy@synopsys.com>

markdownify/__init__.py

@@ -443,7 +443,7 @@ class MarkdownConverter(object):
                 start = int(parent.get("start"))
             else:
                 start = 1
-            bullet = '%s.' % (start + parent.index(el))
+            bullet = '%s.' % (start + len(el.find_previous_siblings('li')))
         else:
             depth = -1
             while el:

tests/test_lists.py

@@ -42,6 +42,7 @@ nested_ols = """
 
 def test_ol():
     assert md('<ol><li>a</li><li>b</li></ol>') == '\n\n1. a\n2. b\n'
+    assert md('<ol><!--comment--><li>a</li><span/><li>b</li></ol>') == '\n\n1. a\n2. b\n'
     assert md('<ol start="3"><li>a</li><li>b</li></ol>') == '\n\n3. a\n4. b\n'
     assert md('foo<ol start="3"><li>a</li><li>b</li></ol>bar') == 'foo\n\n3. a\n4. b\n\nbar'
     assert md('<ol start="-1"><li>a</li><li>b</li></ol>') == '\n\n1. a\n2. b\n'