All modules now have a code_lines attribute, see #1062

jedi/parser_utils.py

@@ -1,8 +1,10 @@
 import textwrap
 from inspect import cleandoc
 
-from jedi._compatibility import literal_eval, force_unicode
 from parso.python import tree
+from parso.cache import parser_cache
+
+from jedi._compatibility import literal_eval, force_unicode
 
 _EXECUTE_NODES = {'funcdef', 'classdef', 'import_from', 'import_name', 'test',
                   'or_test', 'and_test', 'not_test', 'comparison', 'expr',
@@ -238,3 +240,11 @@ def get_parent_scope(node, include_flows=False):
             break
         scope = scope.parent
     return scope
+
+
+def get_cached_code_lines(grammar, path):
+    """
+    Basically access the cached code lines in parso. This is not the nicest way
+    to do this, but we avoid splitting all the lines again.
+    """
+    return parser_cache[grammar._hashed][path].lines