d45477df93
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2520 fd906abe-77d9-0310-91a1-e0d9ade77398
147 lines
4 KiB
Python
147 lines
4 KiB
Python
#
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# Copyright (c) 2008 Helmut Merz helmutm@cy55.de
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#
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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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#
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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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#
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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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#
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"""
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Special namespaces for execution of Python code, e.g. for implementing
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configuration or export/import formats, or providing a restricted Python
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for scripts or an interactive interpreter.
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$Id$
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"""
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import traceback
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from cybertools.meta.element import Element, AutoElement
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from cybertools.util.jeep import Jeep
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_not_found = object()
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class BaseNamespace(dict):
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builtins = '__builtins__', 'dir', 'output'
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def __init__(self, *args, **kw):
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self.__builtins__ = {}
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super(BaseNamespace, self).__init__(*args, **kw)
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for key in self.builtins:
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self[key] = getattr(self, key)
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def output(self, value):
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print value
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def dir(self, obj=None):
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if obj is None:
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return dir(self)
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return dir(obj)
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def __getitem__(self, key):
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result = self.get(key, _not_found)
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if result is _not_found:
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raise NameError(key)
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return result
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def __getattr__(self, key):
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result = self.get(key, _not_found)
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if result is _not_found:
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raise AttributeError(key)
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return result
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def __str__(self):
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def result():
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for k, v in self.items():
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if k not in self.builtins:
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if isinstance(v, Element):
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yield str(v)
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else:
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yield '%s=%r' % (k, v)
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return '\n'.join(list(result()))
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__repr__ = object.__repr__
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class AutoNamespace(BaseNamespace):
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elementFactory = AutoElement
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def __getitem__(self, key):
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result = self.get(key, _not_found)
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if result is _not_found:
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result = self.elementFactory(self, key)
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self[key] = result
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return result
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def __getattr__(self, key):
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if key.startswith('_'): # no auto-creation for special attributes
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raise AttributeError(key)
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return self[key]
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class Executor(object):
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def __init__(self, namespace):
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self.namespace = namespace
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def execute(self, text):
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error = ''
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try:
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exec text in self.namespace
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except:
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error = traceback.format_exc()
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return error
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class Evaluator(Executor):
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def __init__(self, namespace, allowExec=False):
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self.namespace = namespace
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self.allowExec = allowExec
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def evaluate(self, text):
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""" Evaluate the text as a Python expression given and return the
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result. If the text is not an expression try to execute it
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as a statement (resulting in a None value).
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The return value is a tuple with the evaluation result and
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an error traceback if there was an error.
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"""
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if self.allowExec:
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return self.evalutateOrExecute(text)
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result = None
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error = ''
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try:
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result = eval(text, self.namespace)
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except:
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error = traceback.format_exc()
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return result, error
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def evalutateOrExecute(self, text):
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result = None
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error = ''
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try:
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result = eval(text, self.namespace)
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except SyntaxError:
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error = self.execute(text)
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except:
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error = traceback.format_exc()
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return result, error
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class ExecutionError(ValueError):
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pass
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