blob: 52997297036249537a5fec12e2bd9b5b416c66e3 [file] [log] [blame]
#!/usr/bin/env python2.5
# Copyright 2008 the Melange authors.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.
"""List generation logic.
class Lists(object):
"""List array suitable for enumerating over with just 'for in'.
def __init__(self, contents):
"""Constructs a new Lists object with the specified contents.
# All the contents of all the lists
self._contents = contents
self._content = {}
# For iterating over all the lists
self._lists = range(len(contents))
def __getattr__(self, attr):
"""Delegate field lookup to the current list if appropriate.
If, and only if, a lookup is done on one of the fields defined in
DEF_PASSTHROUGH_FIELDS, and the current list defines this field,
the value from the current list is returned.
if attr not in self.DEF_PASSTHROUGH_FIELDS:
raise AttributeError()
if attr not in self._content:
raise AttributeError()
return self.get(attr)
def get(self, item):
"""Returns the item for the current list data.
return self._content[item]
def nextList(self):
"""Shifts out the current list content.
The main content of the next list is returned for further processing.
# Advance the list data once
self._content = self._contents[0]
self._contents = self._contents[1:]
return self
def empty(self):
"""Returns true iff there are no lists
return not self._lists
def lists(self):
"""Returns a list of numbers the size of the amount of lists.
This method can be used to iterate over all lists with shift,
without using a while loop.
return self._lists