diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index 0f7eddce..5a633146 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -106,12 +106,12 @@ class Script(object):
                 source = f.read()
 
         self._source = common.source_to_unicode(source, encoding)
-        lines = common.splitlines(self._source)
-        line = max(len(lines), 1) if line is None else line
-        if not (0 < line <= len(lines)):
+        self._code_lines = common.splitlines(self._source)
+        line = max(len(self._code_lines), 1) if line is None else line
+        if not (0 < line <= len(self._code_lines)):
             raise ValueError('`line` parameter is not in a valid range.')
 
-        line_len = len(lines[line - 1])
+        line_len = len(self._code_lines[line - 1])
         column = line_len if column is None else column
         if not (0 <= column <= line_len):
             raise ValueError('`column` parameter is not in a valid range.')
@@ -162,7 +162,7 @@ class Script(object):
         debug.speed('completions start')
         path = self._user_context.get_path_until_cursor()
         completion = Completion(
-            self._evaluator, self._parser, self._user_context,
+            self._evaluator, self._parser, self._code_lines,
             self._pos, self.call_signatures
         )
         completions = completion.completions(path)
diff --git a/jedi/api/completion.py b/jedi/api/completion.py
index 0c58aa63..9d621b89 100644
--- a/jedi/api/completion.py
+++ b/jedi/api/completion.py
@@ -53,11 +53,11 @@ def filter_names(evaluator, completion_names, like_name):
 
 
 class Completion:
-    def __init__(self, evaluator, parser, user_context, position, call_signatures_method):
+    def __init__(self, evaluator, parser, code_lines, position, call_signatures_method):
         self._evaluator = evaluator
         self._parser = parser
         self._module = evaluator.wrap(parser.module())
-        self._source = user_context.source
+        self._code_lines = code_lines
         self._pos = position
         self._call_signatures_method = call_signatures_method
 
@@ -97,7 +97,7 @@ class Completion:
             pos = pos[0], pos[1] - len(completion_parts.name)
 
         try:
-            stack = helpers.get_stack_at_position(grammar, self._source, self._module, pos)
+            stack = helpers.get_stack_at_position(grammar, self._code_lines, self._module, pos)
         except helpers.OnErrorLeaf as e:
             if e.error_leaf.value == '.':
                 # After ErrorLeaf's that are dots, we will not do any
diff --git a/jedi/api/helpers.py b/jedi/api/helpers.py
index 5fcf3362..9111c873 100644
--- a/jedi/api/helpers.py
+++ b/jedi/api/helpers.py
@@ -4,7 +4,6 @@ Helpers for the API
 import re
 from collections import namedtuple
 
-from jedi import common
 from jedi.evaluate.helpers import call_of_leaf
 from jedi import parser
 from jedi.parser import tokenize, token
@@ -28,13 +27,12 @@ def sorted_definitions(defs):
     return sorted(defs, key=lambda x: (x.module_path or '', x.line or 0, x.column or 0))
 
 
-def _get_code(code, start_pos, end_pos):
+def _get_code(code_lines, start_pos, end_pos):
     """
     :param code_start_pos: is where the code starts.
     """
-    lines = common.splitlines(code)
     # Get relevant lines.
-    lines = lines[start_pos[0] - 1:end_pos[0]]
+    lines = code_lines[start_pos[0] - 1:end_pos[0]]
     # Remove the parts at the end of the line.
     lines[-1] = lines[-1][:end_pos[1]]
     # Remove first line indentation.
@@ -48,7 +46,7 @@ class OnErrorLeaf(Exception):
         return self.args[0]
 
 
-def get_stack_at_position(grammar, source, module, pos):
+def get_stack_at_position(grammar, code_lines, module, pos):
     """
     Returns the possible node names (e.g. import_from, xor_test or yield_stmt).
     """
@@ -72,7 +70,7 @@ def get_stack_at_position(grammar, source, module, pos):
             # impossible.
             raise OnErrorLeaf(user_stmt)
 
-        code = _get_code(source, user_stmt.start_pos, pos)
+        code = _get_code(code_lines, user_stmt.start_pos, pos)
         if code == ';':
             # ; cannot be parsed.
             code = ''