0c4d6dda15
git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@2486 fd906abe-77d9-0310-91a1-e0d9ade77398
90 lines
2.7 KiB
Python
90 lines
2.7 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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Reading and writing loops objects (represented by IElement objects)
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in Python function notation.
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$Id$
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"""
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from zope.cachedescriptors.property import Lazy
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from zope.interface import implements
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from loops.external.interfaces import IReader, IWriter
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from loops.external.element import elementTypes, toplevelElements
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class PyReader(object):
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implements(IReader)
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def read(self, input):
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if not isinstance(input, str):
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input = input.read()
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proc = InputProcessor()
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exec input in proc
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return proc.elements
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class InputProcessor(dict):
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def __init__(self):
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self.elements = []
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self['__builtins__'] = {} # security!
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def __getitem__(self, key):
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def factory(*args, **kw):
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element = elementTypes[key](*args, **kw)
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if key in toplevelElements:
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self.elements.append(element)
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return element
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return factory
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class PyWriter(object):
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implements(IWriter)
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def write(self, elements, output, level=0):
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for idx, element in enumerate(elements):
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args = []
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for arg in element.posArgs:
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if arg in element:
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args.append(repr(element[arg]))
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for k, v in element.items():
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if k not in element.posArgs:
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args.append("%s=%s" % (str(k), repr(v)))
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if not element.subElements:
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output.write('%s%s(%s)'
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% (level*' ', element.elementType, ', '.join(args)))
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else:
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output.write('%s%s(%s)[\n'
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% (level*' ', element.elementType, ', '.join(args)))
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self.write(element.subElements, output, level+1)
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output.write(']')
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if level == 0:
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output.write('\n')
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elif idx < len(elements) - 1:
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output.write(',\n')
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def toStr(value):
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if isinstance(value, unicode):
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return value.encode('UTF-8')
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return str(value)
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