support HTML definition lists (<dl>, <dt>, and <dd>)

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

markdownify/__init__.py

@@ -319,6 +319,38 @@ def convert_code(self, el, text, convert_as_inline):
 
     convert_kbd = convert_code
 
+    def convert_dd(self, el, text, convert_as_inline):
+        text = (text or '').strip()
+        if convert_as_inline:
+            return ' ' + text + ' '
+        if not text:
+            return '\n'
+
+        # indent definition content lines by four spaces
+        def _indent_for_dd(match):
+            line_content = match.group(1)
+            return '    ' + line_content if line_content else ''
+        text = line_with_content_re.sub(_indent_for_dd, text)
+
+        # insert definition marker into first-line indent whitespace
+        text = ':' + text[1:]
+
+        return '%s\n' % text
+
+    def convert_dt(self, el, text, convert_as_inline):
+        # remove newlines from term text
+        text = (text or '').strip()
+        text = all_whitespace_re.sub(' ', text)
+        if convert_as_inline:
+            return ' ' + text + ' '
+        if not text:
+            return '\n'
+
+        # TODO - format consecutive <dt> elements as directly adjacent lines):
+        #   https://michelf.ca/projects/php-markdown/extra/#def-list
+
+        return '\n%s\n' % text
+
     def _convert_hn(self, n, el, text, convert_as_inline):
         """ Method name prefixed with _ to prevent <hn> to call this """
         if convert_as_inline:

tests/test_conversions.py

@@ -104,6 +104,16 @@ def test_code():
     assert md('<code>foo<sub>bar</sub>baz</code>', sub_symbol='^') == '`foobarbaz`'
 
 
+def test_dl():
+    assert md('<dl><dt>term</dt><dd>definition</dd></dl>') == '\nterm\n:   definition\n'
+    assert md('<dl><dt><p>te</p><p>rm</p></dt><dd>definition</dd></dl>') == '\nte rm\n:   definition\n'
+    assert md('<dl><dt>term</dt><dd><p>definition-p1</p><p>definition-p2</p></dd></dl>') == '\nterm\n:   definition-p1\n\n    definition-p2\n'
+    assert md('<dl><dt>term</dt><dd><p>definition 1</p></dd><dd><p>definition 2</p></dd></dl>') == '\nterm\n:   definition 1\n:   definition 2\n'
+    assert md('<dl><dt>term 1</dt><dd>definition 1</dd><dt>term 2</dt><dd>definition 2</dd></dl>') == '\nterm 1\n:   definition 1\nterm 2\n:   definition 2\n'
+    assert md('<dl><dt>term</dt><dd><blockquote><p>line 1</p><p>line 2</p></blockquote></dd></dl>') == '\nterm\n:   > line 1\n    >\n    > line 2\n'
+    assert md('<dl><dt>term</dt><dd><ol><li><p>1</p><ul><li>2a</li><li>2b</li></ul></li><li><p>3</p></li></ol></dd></dl>') == '\nterm\n:   1. 1\n\n       * 2a\n       * 2b\n    2. 3\n'
+
+
 def test_del():
     inline_tests('del', '~~')