Mercurial > genshi > genshi-test
comparison markup/eval.py @ 27:b8456279c444
* Fix the boilerplate in the Python source files.
* Some more docstrings and cosmetic fixes.
| author | cmlenz |
|---|---|
| date | Wed, 28 Jun 2006 09:28:09 +0000 |
| parents | ebe34f07d3eb |
| children | 2ee9f28e16e5 |
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| 26:039fc5b87405 | 27:b8456279c444 |
|---|---|
| 3 # Copyright (C) 2006 Christopher Lenz | 3 # Copyright (C) 2006 Christopher Lenz |
| 4 # All rights reserved. | 4 # All rights reserved. |
| 5 # | 5 # |
| 6 # This software is licensed as described in the file COPYING, which | 6 # This software is licensed as described in the file COPYING, which |
| 7 # you should have received as part of this distribution. The terms | 7 # you should have received as part of this distribution. The terms |
| 8 # are also available at http://trac.edgewall.com/license.html. | 8 # are also available at http://markup.cmlenz.net/wiki/License. |
| 9 # | 9 # |
| 10 # This software consists of voluntary contributions made by many | 10 # This software consists of voluntary contributions made by many |
| 11 # individuals. For the exact contribution history, see the revision | 11 # individuals. For the exact contribution history, see the revision |
| 12 # history and logs, available at http://projects.edgewall.com/trac/. | 12 # history and logs, available at http://markup.cmlenz.net/log/. |
| 13 | |
| 14 """Support for "safe" evaluation of Python expressions.""" | |
| 13 | 15 |
| 14 import __builtin__ | 16 import __builtin__ |
| 15 import compiler | 17 import compiler |
| 16 import operator | 18 import operator |
| 17 | 19 |
| 99 """ | 101 """ |
| 100 __slots__ = ['source', 'ast'] | 102 __slots__ = ['source', 'ast'] |
| 101 __visitors = {} | 103 __visitors = {} |
| 102 | 104 |
| 103 def __init__(self, source): | 105 def __init__(self, source): |
| 106 """Create the expression. | |
| 107 | |
| 108 @param source: the expression as string | |
| 109 """ | |
| 104 self.source = source | 110 self.source = source |
| 105 self.ast = None | 111 self.ast = None |
| 106 | 112 |
| 107 def evaluate(self, data): | 113 def evaluate(self, data): |
| 114 """Evaluate the expression against the given data dictionary. | |
| 115 | |
| 116 @param data: a mapping containing the data to evaluate against | |
| 117 @return: the result of the evaluation | |
| 118 """ | |
| 108 if not self.ast: | 119 if not self.ast: |
| 109 self.ast = compiler.parse(self.source, 'eval') | 120 self.ast = compiler.parse(self.source, 'eval') |
| 110 return self._visit(self.ast.node, data) | 121 return self._visit(self.ast.node, data) |
| 111 | 122 |
| 112 def __repr__(self): | 123 def __repr__(self): |