Expose #+BEGIN_ block arguments.

org_rw/dom.py

@@ -89,11 +89,12 @@ class BlockNode:
 
 
 class CodeBlock(BlockNode):
-    def __init__(self, header, subtype):
+    def __init__(self, header, subtype, arguments):
         super().__init__()
         self.header = header
         self.lines = None
         self.subtype = subtype
+        self.arguments = arguments
 
     def set_lines(self, lines):
         self.lines = lines

org_rw/org_rw.py

@@ -481,7 +481,7 @@ class Headline:
                 and line.delimiter_type == DelimiterLineType.BEGIN_BLOCK
             ):
                 assert type(current_node) in NON_FINISHED_GROUPS
-                current_node = dom.CodeBlock(line, line.type_data.subtype)
+                current_node = dom.CodeBlock(line, line.type_data.subtype, line.arguments)
 
             elif isinstance(line, Keyword):
                 logging.warning("Keywords not implemented on `as_dom()`")