Simplify - call ast.parse inline, rather than via a separate method.

IPython/core/inputsplitter.py

@@ -446,11 +446,11 b' class InputSplitter(object):'
                     return False
             else:
                 try:
-                    nodes = self.ast_nodes()
+                    code_ast = ast.parse(u''.join(self._buffer))
                 except Exception:
                     return False
                 else:
-                    if len(nodes) == 1:
+                    if len(code_ast.body) == 1:
                         return False
 
         # When input is complete, then termination is marked by an extra blank
@@ -540,23 +540,6 b' class InputSplitter(object):'
         # splitter, which is more accurate than ours.
         return split_blocks(''.join(blocks))
     
-    def ast_nodes(self, lines=None):
-        """Turn the lines into a list of AST nodes.
-        
-        Parameters
-        ----------
-        lines : str
-          A (possibly multiline) string of Python code. If None (default), it
-          will use the InputSplitter's current code buffer.
-          
-        Returns
-        -------
-        A list of AST (abstract syntax tree) nodes representing the code.
-        """
-        if lines is None:
-            lines = u"".join(self._buffer)
-        return ast.parse(lines).body
-
     #------------------------------------------------------------------------
     # Private interface
     #------------------------------------------------------------------------

IPython/core/interactiveshell.py

@@ -2125,7 +2125,7 b' class InteractiveShell(Configurable, Magic):'
             
             with self.display_trap:
                 try:
-                    nodes = self.input_splitter.ast_nodes(cell)
+                    code_ast = ast.parse(cell)
                 except (OverflowError, SyntaxError, ValueError, TypeError, MemoryError):
                     # Case 1
                     self.showsyntaxerror(filename)
@@ -2135,7 +2135,7 b' class InteractiveShell(Configurable, Magic):'
                 if len(cell.splitlines()) == 1:
                     interactivity = 2   # Single line; run fully interactive
 
-                self.run_ast_nodes(nodes, interactivity)
+                self.run_ast_nodes(code_ast.body, interactivity)
                 
         if store_history:
             # Write output to the database. Does nothing unless