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"""Wrapper around linecache which decodes files to unicode according to PEP 263.

This is only needed for Python 2 - linecache in Python 3 does the same thing

itself.

"""

import functools

import linecache

import sys

from IPython.utils import py3compat

from IPython.utils import openpy

if py3compat.PY3:

getline = linecache.getline

# getlines has to be looked up at runtime, because doctests monkeypatch it.

@functools.wraps(linecache.getlines)

def getlines(filename, module_globals=None):

return linecache.getlines(filename, module_globals=module_globals)

else:

def getlines(filename, module_globals=None):

"""Get the lines (as unicode) for a file from the cache.

Update the cache if it doesn't contain an entry for this file already."""

filename = py3compat.cast_bytes(filename, sys.getfilesystemencoding())

lines = linecache.getlines(filename, module_globals=module_globals)

# The bits we cache ourselves can be unicode.

if (not lines) or isinstance(lines[0], py3compat.unicode_type):

return lines

readline = openpy._list_readline(lines)

try:

encoding, _ = openpy.detect_encoding(readline)

except SyntaxError:

encoding = 'ascii'

return [l.decode(encoding, 'replace') for l in lines]

# This is a straight copy of linecache.getline

def getline(filename, lineno, module_globals=None):

lines = getlines(filename, module_globals)

if 1 <= lineno <= len(lines):

return lines[lineno-1]

else:

return ''