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49 lines
1.4 KiB
Python
49 lines
1.4 KiB
Python
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# safe_eval.py
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"""
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This module is an integeral part of the program
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MMA - Musical Midi Accompaniment.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Bob van der Poel <bob@mellowood.ca>
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"""
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import re
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from math import *
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from common import error
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safeCmds = [ 'ceil', 'fabs', 'floor', 'exp', 'log', 'log10', 'pow',
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'sqrt', 'acos', 'asin', 'atan', 'atan2', 'cos', 'hypot',
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'sin', 'tan', 'degrees', 'radians', 'cosh', 'sinh',
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'int', 'in', '.join', 'str', '.split', 'for' ]
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def safe_eval( expr ):
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toks = re.split( r'([a-zA-Z_\.]+|.)', expr )
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for t in toks:
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if len(t)>1 and t not in safeCmds:
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error("Illegal/Unknown operator '%s' in $()." % t)
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try:
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return eval(expr)
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except:
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error("Illegal operation in '%s'." % expr)
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