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# -*- coding: utf-8 -*-
#
# File: portato/eix/__init__.py
# This file is part of the Portato-Project, a graphical portage-frontend.
#
# Copyright (C) 2006-2009 René 'Necoro' Neumann
# This is free software. You may redistribute copies of it under the terms of
# the GNU General Public License version 2.
# There is NO WARRANTY, to the extent permitted by law.
#
# Written by René 'Necoro' Neumann <necoro@necoro.net>
"""
A module to parse the eix-cache files.
"""
from __future__ import absolute_import, with_statement
__docformat__ = "restructuredtext"
from . import parser
from .exceptions import UnsupportedVersionError
from ..helper import debug
class EixReader(object):
"""
The main class to use to have access to the eix-cache.
Note that the file used internally stays open during the whole operation.
So please call `close()` when you are finished.
The ``EixReader`` supports the context manager protocol, so you can the ``with ... as ...``.
:CVariables:
supported_versions : int[]
The list of versions of the eix-cache, which are supported by this reader.
:IVariables:
file : file
The eix cache file.
header : `parser.header`
The header of the eix cache.
categories : `parser.category` []
The list of categories.
"""
supported_versions = (28,)
def __init__ (self, filename):
"""
:param filename: Path to the cache file
:type filename: string
"""
self.file = open(filename, "r")
try:
version = parser.number(self.file)
if version not in self.supported_versions:
raise UnsupportedVersionError(self.version)
debug("Started EixReader for version %s.", version)
self.file.seek(0)
self.header = parser.header(self.file)
self.categories = parser.vector(self.file, parser.category, nelems = self.header.ncats)
except:
self.close()
raise
def __enter__ (self):
return self
def __exit__ (self, exc_type, exc_val, exc_tb):
self.close()
def close (self):
"""
Closes the cache file.
"""
self.file.close()
debug("EixReader closed.")
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