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7 # This software may be used and distributed according to the terms of the |
7 # This software may be used and distributed according to the terms of the |
8 # GNU General Public License version 2 or any later version. |
8 # GNU General Public License version 2 or any later version. |
9 |
9 |
10 from __future__ import absolute_import |
10 from __future__ import absolute_import |
11 |
11 |
12 import __future__ |
12 import ast |
13 import codecs |
13 import codecs |
14 import re as remod |
14 import re as remod |
15 import textwrap |
15 import textwrap |
16 |
16 |
17 from ..i18n import _ |
17 from ..i18n import _ |
497 |
497 |
498 If s is not a valid boolean, returns None. |
498 If s is not a valid boolean, returns None. |
499 """ |
499 """ |
500 return _booleans.get(s.lower(), None) |
500 return _booleans.get(s.lower(), None) |
501 |
501 |
502 def evalpython(s): |
502 def evalpythonliteral(s): |
503 """Evaluate a string containing a Python expression. |
503 """Evaluate a string containing a Python literal expression""" |
504 |
504 # We could backport our tokenizer hack to rewrite '' to u'' if we want |
505 THIS FUNCTION IS NOT SAFE TO USE ON UNTRUSTED INPUT. IT'S USE SHOULD BE |
505 return ast.literal_eval(s) |
506 LIMITED TO DEVELOPER-FACING FUNCTIONALITY. |
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507 """ |
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508 globs = { |
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509 r'__builtins__': { |
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510 r'None': None, |
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511 r'False': False, |
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512 r'True': True, |
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513 r'int': int, |
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514 r'set': set, |
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515 r'tuple': tuple, |
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516 # Don't need to expose dict and list because we can use |
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517 # literals. |
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518 }, |
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519 } |
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520 |
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521 # We can't use eval() directly because it inherits compiler |
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522 # flags from this module and we need unicode literals for Python 3 |
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523 # compatibility. |
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524 code = compile(s, r'<string>', r'eval', |
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525 __future__.unicode_literals.compiler_flag, True) |
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526 return eval(code, globs, {}) |
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