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"""Wrapper around linecache which decodes files to unicode according to PEP 263.
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This is only needed for Python 2 - linecache in Python 3 does the same thing
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itself.
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"""
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import functools
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import linecache
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import sys
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from IPython.utils import py3compat
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from IPython.utils import openpy
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if py3compat.PY3:
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getline = linecache.getline
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# getlines has to be looked up at runtime, because doctests monkeypatch it.
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@functools.wraps(linecache.getlines)
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def getlines(filename, module_globals=None):
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return linecache.getlines(filename, module_globals=module_globals)
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else:
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def getlines(filename, module_globals=None):
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"""Get the lines (as unicode) for a file from the cache.
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Update the cache if it doesn't contain an entry for this file already."""
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filename = py3compat.cast_bytes(filename, sys.getfilesystemencoding())
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lines = linecache.getlines(filename, module_globals=module_globals)
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# The bits we cache ourselves can be unicode.
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if (not lines) or isinstance(lines[0], py3compat.unicode_type):
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return lines
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readline = openpy._list_readline(lines)
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try:
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encoding, _ = openpy.detect_encoding(readline)
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except SyntaxError:
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encoding = 'ascii'
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return [l.decode(encoding, 'replace') for l in lines]
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# This is a straight copy of linecache.getline
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def getline(filename, lineno, module_globals=None):
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lines = getlines(filename, module_globals)
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if 1 <= lineno <= len(lines):
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return lines[lineno-1]
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else:
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return ''
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