94 lines
2.9 KiB
Python
94 lines
2.9 KiB
Python
#
|
|
# Copyright (c) 2008 Helmut Merz helmutm@cy55.de
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write to the Free Software
|
|
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
#
|
|
|
|
"""
|
|
Reading and writing loops objects (represented by IElement objects)
|
|
in Python function notation.
|
|
|
|
$Id$
|
|
"""
|
|
|
|
from zope.cachedescriptors.property import Lazy
|
|
from zope.interface import implements
|
|
|
|
from loops.external.interfaces import IReader, IWriter
|
|
from loops.external.element import elementTypes, toplevelElements
|
|
|
|
|
|
class PyReader(object):
|
|
|
|
implements(IReader)
|
|
|
|
def read(self, input):
|
|
if not isinstance(input, str):
|
|
input = input.read()
|
|
proc = InputProcessor()
|
|
exec input in proc
|
|
return proc.elements
|
|
|
|
|
|
class InputProcessor(dict):
|
|
|
|
_constants = dict(True=True, False=False)
|
|
|
|
def __init__(self):
|
|
self.elements = []
|
|
self['__builtins__'] = dict() # security!
|
|
|
|
def __getitem__(self, key):
|
|
if key in self._constants:
|
|
return self._constants[key]
|
|
def factory(*args, **kw):
|
|
element = elementTypes[key](*args, **kw)
|
|
if key in toplevelElements:
|
|
self.elements.append(element)
|
|
return element
|
|
return factory
|
|
|
|
|
|
class PyWriter(object):
|
|
|
|
implements(IWriter)
|
|
|
|
def write(self, elements, output, level=0):
|
|
for idx, element in enumerate(elements):
|
|
args = []
|
|
for arg in element.posArgs:
|
|
if arg in element:
|
|
args.append(repr(element[arg]))
|
|
for k, v in element.items():
|
|
if k not in element.posArgs:
|
|
args.append("%s=%s" % (str(k), repr(v)))
|
|
if not element.subElements:
|
|
output.write('%s%s(%s)'
|
|
% (level*' ', element.elementType, ', '.join(args)))
|
|
else:
|
|
output.write('%s%s(%s)[\n'
|
|
% (level*' ', element.elementType, ', '.join(args)))
|
|
self.write(element.subElements, output, level+1)
|
|
output.write(']')
|
|
if level == 0:
|
|
output.write('\n')
|
|
elif idx < len(elements) - 1:
|
|
output.write(',\n')
|
|
|
|
|
|
def toStr(value):
|
|
if isinstance(value, unicode):
|
|
return value.encode('UTF-8')
|
|
return str(value)
|