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# config.py -- Portage Config
# Copyright 2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
import os
class LoaderError(Exception):
def __init__(self, resource, error_msg):
"""
@param resource: Resource that failed to load (file/sql/etc)
@type resource: String
@param error_msg: Error from underlying Loader system
@type error_msg: String
"""
self.resource
def __str__(self):
return "Failed while loading resource: %s, error was: %s" % (
resource, error_msg)
def RecursiveFileLoader(filename):
"""
If filename is of type file, return [filename]
else if filename is of type directory, return an array
full of files in that directory to process.
Ignore files beginning with . or ending in ~.
Prune CVS directories.
@param filename: name of a file/directory to traverse
@rtype: list
@returns: List of files to process
"""
if os.path.isdir(filename):
for root, dirs, files in os.walk(self.fname):
if 'CVS' in dirs:
dirs.remove('CVS')
files = filter(files,startswith('.'))
files = filter(files,endswith('~'))
for file in files:
yield file
else:
yield filename
class DataLoader(object):
def __init__(self, validator=None):
f = validator
if f is None:
# if they pass in no validator, just make a fake one
# that always returns true
class AlwaysTrue(object):
def validate(self, key):
return True
f = AlwaysTrue()
self._validator = f
def load(self):
"""
Function to do the actual work of a Loader
"""
pass
class ItemFileLoader(DataLoader):
"""
Class to load data from a file full of items one per line
>>> item1
>>> item2
>>> item3
>>> item1
becomes { 'item1':None, 'item2':None, 'item3':None }
Note that due to the data store being a dict, duplicates
are removed.
"""
_recursive = False
def __init__(self, filename, validator):
DataLoader.__init__(self, validator)
self.fname = filename
def load(self):
data = {}
errors = {}
for file in RecursiveFileLoader(self.fname):
f = open(file, 'rb')
for line_num, line in enumerate(f):
if line.startswith('#'):
continue
split = line.strip().split()
if not len(split):
errors.setdefault(self.fname,[]).append(
"Malformed data at line: %s, data: %s"
% (line_num + 1, split))
key = split[0]
if not self._validator.validate(key):
errors.setdefault(self.fname,[]).append(
"Validation failed at line: %s, data %s"
% (line_num + 1, split))
continue
data[key] = None
return (data, errors)
class KeyListFileLoader(DataLoader):
"""
Class to load data from a file full of key [list] tuples
>>>>key foo1 foo2 foo3
becomes
{'key':['foo1','foo2','foo3']}
"""
_recursive = False
def __init__(self, filename, validator):
DataLoader.__init__(self, validator)
self.fname = filename
def load(self):
data = {}
errors = {}
for file in RecursiveFileLoader(self.fname):
f = open(file, 'rb')
for line_num, line in enumerate(f):
if line.startswith('#'):
continue
split = line.strip().split()
if len(split) < 2:
errors.setdefault(self.fname,[]).append(
"Malformed data at line: %s, data: %s"
% (line_num + 1, split))
continue
key = split[0]
value = split[1:]
if not self._validator.validate(key):
errors.setdefault(self.fname,[]).append(
"Validation failed at line: %s, data %s"
% (line_num + 1, split))
continue
if key in data:
data[key].append(value)
else:
data[key] = value
return (data, errors)
class KeyValuePairFileLoader(DataLoader):
"""
Class to load data from a file full of key=value pairs
>>>>key=value
>>>>foo=bar
becomes:
{'key':'value',
'foo':'bar'}
"""
_recursive = False
def __init__(self, filename, validator):
DataLoader.__init__(self, validator)
self.fname = filename
def load(self):
"""
Return the {source: {key: value}} pairs from a file
Return the {source: [list of errors] from a load
@param recursive: If set and self.fname is a directory;
load all files in self.fname
@type: Boolean
@rtype: tuple
@returns:
Returns (data,errors), both may be empty dicts or populated.
"""
DataLoader.load(self)
data = {}
errors = {}
for file in RecursiveFileLoader(self.fname):
f = open(file, 'rb')
for line_num, line in enumerate(f):
if line.startswith('#'):
continue
split = line.strip().split('=')
if len(split) < 2:
errors.setdefault(self.fname,[]).append(
"Malformed data at line: %s, data %s"
% (line_num + 1, split))
key = split[0]
value = split[1:]
if not self._validator.validate(key):
errors.setdefault(self.fname,[]).append(
"Validation failed at line: %s, data %s"
% (line_num + 1, split))
continue
if key in data:
data[key].append(value)
else:
data[key] = value
return (data, errors)
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