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"""
Python-syntax configuration loader and abstractor
Usage::
conf = Config()
conf.load('file1.py')
conf.load('file2.py')
Loads files as Python files, gets all global variables as configuration
keys. You can load multiple files, which will overwrite previous
values (but will not delete previous values). You can use attribute
or dictionary access to get values.
"""
import types
import os
from wsgikit.util import thirdparty
UserDict = thirdparty.load_new_module('UserDict', (2, 3))
def load(filename):
conf = Config()
conf.load(filename)
return conf
class NoContext:
pass
class BadCommandLine(Exception):
pass
class Config(UserDict.DictMixin):
def __init__(self):
self.namespaces = []
def __getitem__(self, attr):
for space in self.namespaces:
if space.has_key(attr):
return space[attr]
raise KeyError(
"Configuration key %r not found" % attr)
def __setitem__(self, attr, value):
self.namespaces[0][attr] = value
def keys(self):
keys = {}
for ns in self.namespaces:
for key in ns.keys():
keys[key] = None
return keys.keys()
def copy(self):
namespaces = [d.copy() for d in self.namespaces]
new = self.__class__()
new.namespaces = namespaces
return new
def load(self, filename, default=False):
f = open(filename, 'rb')
content = f.read()
f.close()
namespace = {}
for key in self:
namespace[key] = self[key]
orig = namespace.copy()
namespace['__file__'] = os.path.abspath(filename)
exec content in namespace
for name in namespace.keys():
if (hasattr(__builtins__, name)
or name.startswith('_')):
del namespace[name]
continue
if orig.has_key(name) and namespace[name] is orig[name]:
del namespace[name]
continue
if isinstance(namespace[name], types.ModuleType):
del namespace[name]
continue
self.load_dict(namespace, default)
def load_dict(self, d, default=False):
if default:
self.namespaces.insert(default, d)
else:
self.namespaces.insert(0, d)
def load_commandline(self, items, bool_options, aliases={}, default=False):
"""
Loads options from the command line. bool_options take no arguments,
everything else is supposed to take arguments. aliases is a mapping
of arguments to other arguments. All -'s are turned to _, like
--config-file=... becomes config_file. Any extra arguments are
returned as a list.
"""
options = {}
args = []
while items:
if items[0] == '--':
args.extend(items[1:])
break
elif items[0].startswith('--'):
name = items[0][2:]
value = None
if '=' in name:
name, value = name.split('=', 1)
name = aliases.get(name, name)
if (name in bool_options
or name.replace('-', '_') in bool_options):
if value is not None:
raise BadCommandLine(
"%s does not take any arguments"
% items[0])
options[name] = True
items.pop(0)
continue
if value is None:
if len(items) <= 1:
raise BadCommandLine(
"%s takes an argument, but no argument given"
% items[0])
value = items[1]
items.pop(0)
items.pop(0)
value = self.convert_commandline(value)
options[name] = value
elif items[0].startswith('-'):
orig = items[0]
name = items[0][1:]
items.pop(0)
if '=' in name:
raise BadCommandLine(
"Single-character options may not have arguments (%r)"
% orig)
for i in range(len(name)):
op_name = aliases.get(name[i], name[i])
if op_name in bool_options:
options[op_name] = True
else:
if i != len(name)-1:
raise BadCommandLine(
"-%s takes an argument, it cannot be followed "
"by other options (in %s)"
% (name[i], orig))
if not items:
raise BadCommandLine(
"-%s takes an argument, but no argument given"
% name[i])
value = self.convert_commandline(items[0])
items.pop(0)
options[op_name] = value
break
else:
args.append(items[0])
items.pop(0)
for key in options.keys():
options[key.replace('-', '_')] = options[key]
self.load_dict(options, default)
return args
def convert_commandline(self, value):
try:
return int(value)
except ValueError:
pass
return value
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