+
−#!/usr/bin/python2.5
+
−#
+
−# Copyright 2008 the Melange authors.
+
−#
+
−# Licensed under the Apache License, Version 2.0 (the "License");
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−# you may not use this file except in compliance with the License.
+
−# You may obtain a copy of the License at
+
−#
+
−#   http://www.apache.org/licenses/LICENSE-2.0
+
−#
+
−# Unless required by applicable law or agreed to in writing, software
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−# distributed under the License is distributed on an "AS IS" BASIS,
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−# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+
−# See the License for the specific language governing permissions and
+
−# limitations under the License.
+
−
+
−"""List generation logic
+
−"""
+
−
+
−__authors__ = [
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−  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
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−  ]
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−
+
−
+
−class Lists(object):
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−  """List array suitable for enumerating over with just 'for in'
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−  """
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−
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−  DEF_PASSTHROUGH_FIELDS = [
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−      'pagination',
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−      'description',
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−      'heading',
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−      'row',
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−      'limit',
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−      'newest',
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−      'prev',
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−      'next',
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−      'first',
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−      'last',
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−      ]
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−
+
−  def __init__(self, contents):
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−    """Constructs a new Lists object with the specified contents
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−    """
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−
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−    # All the contents of all the lists
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−    self.contents = contents
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−    self.content = {}
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−
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−    # For iterating over all the lists
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−    self.lists = range(len(contents))
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−    self.list_data = []
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−
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−    # For iterating over the rows
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−    self.rows = []
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−    self.row_data = []
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−
+
−  def __getattr__(self, attr):
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−    """Delegate field lookup to the current list if appropriate
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−
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−    If, and only if, a lookup is done on one of the fields defined in
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−    DEF_PASSTHROUGH_FIELDS, and the current list defines this field,
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−    the value from the current list is returned.
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−    """
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−
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−    if attr not in self.DEF_PASSTHROUGH_FIELDS:
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−      raise AttributeError()
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−
+
−    if attr not in self.content:
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−      raise AttributeError()
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−
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−    return self.get(attr)
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−
+
−  def get(self, item):
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−    """Returns the item for the current list data
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−    """
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−
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−    return self.content[item]
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−
+
−  def next_list(self):
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−    """Shifts out the current list content
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−
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−    The main content of the next list is returned for further processing.
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−    """
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−
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−    # Advance the list data once
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−    self.content = self.contents[0]
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−    self.contents = self.contents[1:]
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−
+
−    # Update internal 'iterators'
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−    self.list_data = self.get('data')
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−    self.rows = range(len(self.list_data))
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−
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−    return self.get('main')
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−
+
−  def next_row(self):
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−    """Returns the next list row for the current list
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−
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−    Before calling this method, next_list should be called at least once.
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−    """
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−
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−    # Update internal 'iterators'
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−    self.row_data =  self.list_data[0]
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−
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−    # Advance the row data once
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−    self.list_data = self.list_data[1:]
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−
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−    return self.get('row')
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−
+
−  def lists(self):
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−    """Returns a list of numbers the size of the amount of lists.
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−
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−    This method can be used to iterate over all lists with shift,
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−    without using a while loop.
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−    """
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−
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−    return self.lists
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−
+
−  def rows(self):
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−    """Returns a list of numbers the size of the amount of items.
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−
+
−    This method can be used to iterate over all items with next for
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−    the current list, without using a while loop.
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−    """
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−
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−    return self.rows
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−
+
−  def item(self):
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−    """Returns the current row item for the current list
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−
+
−    Before calling this method, next_row should be called at least once.
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−    """
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−
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−    return self.row_data
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−
+
−  def redirect(self):
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−    """Returns the redirect for the current row item in the current list.
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−    """
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−
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−    action, args = self.get('action')
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−    result = action(self.row_data, args)
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−    return result