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#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
Convert PythonTeX scripts from Python 2 to Python 3
It isn't possible to have a single PythonTeX code base, since unicode text
needs to be supported. Under Python 2, this means importing unicode_literals
from __future__, or using the unicode function or "u" prefix. Under Python 3,
all strings are automatically unicode.
At the same time, the differences between the Python 2 and 3 versions are
usually very small, involving only a few lines of code. To keep the code base
unified, while simultaneously fully supporting both Python 2 and 3, the
following scheme was devised. The code is written for Python 2. Whenever
code is not compatible with Python 3, it is enclosed with the tags
"#// Python 2" and "#\\ End Python 2" (each on its own line, by itself). If
a Python 3 version of the code is needed, it is included between analogous
tags "#// Python 3" and "#\\ End Python 2". The Python 3 code is commented
out with "#", at the same indentation level as the Python 3 tags.
This script creates Python 3 scripts from the original Python 2 scripts
by commenting out everything between the Python 2 tags, and uncommenting
everything between the Python 3 tags. In this way, full compatibility is
maintained with both Python 2 and 3 while keeping the code base essentially
unified. This approach also allows greater customization of version-specific
code than would be possible if automatic translation with a tool like 2to3
was required.
Copyright (c) 2012-2013, Geoffrey M. Poore
All rights reserved.
Licensed under the BSD 3-Clause License:
http://www.opensource.org/licenses/BSD-3-Clause
'''
# Imports
from __future__ import unicode_literals
from io import open
import re
files_to_process = ('pythontex2.py', 'depythontex2.py')
encoding = 'utf-8'
def from2to3(list_of_code):
fixed = []
in_2 = False
in_3 = False
indent = ''
for line in list_of_code:
if r'#// Python 2' in line:
in_2 = True
indent = line.split('#', 1)[0]
elif r'#\\ End Python 2' in line:
in_2 = False
elif r'#// Python 3' in line:
in_3 = True
indent = line.split('#', 1)[0]
elif r'#\\ End Python 3' in line:
in_3 = False
elif in_2:
line = re.sub(indent, indent + '#', line, count=1)
elif in_3:
line = re.sub(indent + '#', indent, line, count=1)
fixed.append(line)
return fixed
for file in files_to_process:
f = open(file, 'r', encoding=encoding)
converted_code = from2to3(f.readlines())
f.close()
f = open(re.sub('2', '3', file), 'w', encoding=encoding)
f.write(''.join(converted_code))
f.close()
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