remove __init__ from JupyterCellNode and JupyterKernelNode

__init__ needs to be compatible with docutils.nodes.Element to
facilitate doctree copying. Given that each type of node is
constructed in just one place (in the associated directive)
this does not break encapulation too badly.

Author: jbweston

jupyter_sphinx/execute.py

@@ -62,8 +62,9 @@ class JupyterKernel(Directive):
 
     def run(self):
         return [JupyterKernelNode(
-            kernel_name=self.arguments[0] if self.arguments else '',
-            kernel_id=self.options.get('id', ''),
+            '',
+            kernel_name=self.arguments[0].strip() if self.arguments else '',
+            kernel_id=self.options.get('id', '').strip(),
         )]
 
 
@@ -74,13 +75,6 @@ class JupyterKernelNode(docutils.nodes.Element):
     next, if any, JupyterKernelNode) should be executed in a separate kernel.
     """
 
-    def __init__(self, kernel_name, kernel_id):
-        super().__init__(
-            '',
-            kernel_name=kernel_name.strip(),
-            kernel_id=kernel_id.strip(),
-        )
-
 
 def csv_option(s):
     return [p.strip() for p in s.split(',')] if s else []
@@ -153,7 +147,16 @@ def run(self):
             self.assert_has_content()
             content = self.content
 
-        return [JupyterCellNode(content, self.options)]
+        return [JupyterCellNode(
+            '',
+            docutils.nodes.literal_block(
+                text='\n'.join(content),
+            ),
+            hide_code=('hide-code' in self.options),
+            hide_output=('hide-output' in self.options),
+            code_below=('code-below' in self.options),
+            raises=self.options.get('raises'),
+        )]
 
 
 class JupyterCellNode(docutils.nodes.container):
@@ -163,18 +166,6 @@ class JupyterCellNode(docutils.nodes.container):
     doctree-transformation step.
     """
 
-    def __init__(self, source_lines, options):
-        return super().__init__(
-            '',
-            docutils.nodes.literal_block(
-                text='\n'.join(source_lines),
-            ),
-            hide_code=('hide-code' in options),
-            hide_output=('hide-output' in options),
-            code_below=('code-below' in options),
-            raises=options.get('raises'),
-        )
-
 
 ### Doctree transformations