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"""
This is a heavily hacked version of ConfigParser to keep the order in
which options and sections are read, and allow multiple options with
the same key.
"""
from __future__ import generators
import string, types
import re
__all__ = ["NoSectionError","DuplicateSectionError","NoOptionError",
"InterpolationError","InterpolationDepthError","ParsingError",
"MissingSectionHeaderError","ConfigParser",
"MAX_INTERPOLATION_DEPTH"]
DEFAULTSECT = "DEFAULT"
MAX_INTERPOLATION_DEPTH = 10
# exception classes
class Error(Exception):
def __init__(self, msg=''):
self._msg = msg
Exception.__init__(self, msg)
def __repr__(self):
return self._msg
__str__ = __repr__
class NoSectionError(Error):
def __init__(self, section):
Error.__init__(self, 'No section: %s' % section)
self.section = section
class DuplicateSectionError(Error):
def __init__(self, section):
Error.__init__(self, "Section %s already exists" % section)
self.section = section
class NoOptionError(Error):
def __init__(self, option, section):
Error.__init__(self, "No option `%s' in section: %s" %
(option, section))
self.option = option
self.section = section
class InterpolationError(Error):
def __init__(self, reference, option, section, rawval):
Error.__init__(self,
"Bad value substitution:\n"
"\tsection: [%s]\n"
"\toption : %s\n"
"\tkey : %s\n"
"\trawval : %s\n"
% (section, option, reference, rawval))
self.reference = reference
self.option = option
self.section = section
class InterpolationDepthError(Error):
def __init__(self, option, section, rawval):
Error.__init__(self,
"Value interpolation too deeply recursive:\n"
"\tsection: [%s]\n"
"\toption : %s\n"
"\trawval : %s\n"
% (section, option, rawval))
self.option = option
self.section = section
class ParsingError(Error):
def __init__(self, filename):
Error.__init__(self, 'File contains parsing errors: %s' % filename)
self.filename = filename
self.errors = []
def append(self, lineno, line):
self.errors.append((lineno, line))
self._msg = self._msg + '\n\t[line %2d]: %s' % (lineno, line)
class MissingSectionHeaderError(ParsingError):
def __init__(self, filename, lineno, line):
Error.__init__(
self,
'File contains no section headers.\nfile: %s, line: %d\n%s' %
(filename, lineno, line))
self.filename = filename
self.lineno = lineno
self.line = line
class ConfigParser:
def __init__(self, defaults=None):
# Options are stored in __sections_list like this:
# [(sectname, [(optname, optval), ...]), ...]
self.__sections_list = []
self.__sections_dict = {}
if defaults is None:
self.__defaults = {}
else:
self.__defaults = defaults
def defaults(self):
return self.__defaults
def sections(self):
return self.__sections_dict.keys()
def has_section(self, section):
return self.__sections_dict.has_key(section)
def options(self, section):
self.__sections_dict[section]
try:
opts = self.__sections_dict[section].keys()
except KeyError:
raise NoSectionError(section)
return self.__defaults.keys()+opts
def read(self, filenames):
if type(filenames) in types.StringTypes:
filenames = [filenames]
for filename in filenames:
try:
fp = open(filename)
except IOError:
continue
self.__read(fp, filename)
fp.close()
def readfp(self, fp, filename=None):
if filename is None:
try:
filename = fp.name
except AttributeError:
filename = '<???>'
self.__read(fp, filename)
def set(self, section, option, value):
if self.__sections_dict.has_key(section):
sectdict = self.__sections_dict[section]
sectlist = []
self.__sections_list.append((section, sectlist))
elif section == DEFAULTSECT:
sectdict = self.__defaults
sectlist = None
else:
sectdict = {}
self.__sections_dict[section] = sectdict
sectlist = []
self.__sections_list.append((section, sectlist))
xform = self.optionxform(option)
sectdict[xform] = value
if sectlist is not None:
sectlist.append([xform, value])
def get(self, section, option, raw=0, vars=None):
d = self.__defaults.copy()
try:
d.update(self.__sections_dict[section])
except KeyError:
if section != DEFAULTSECT:
raise NoSectionError(section)
if vars:
d.update(vars)
option = self.optionxform(option)
try:
rawval = d[option]
except KeyError:
raise NoOptionError(option, section)
if raw:
return rawval
return self.__interpolate(rawval, d)
def getall(self, section, option, raw=0, vars=None):
option = self.optionxform(option)
values = []
d = self.__defaults.copy()
if section != DEFAULTSECT:
for sectname, options in self.__sections_list:
if sectname == section:
for optname, value in options:
if optname == option:
values.append(value)
d[optname] = value
if raw:
return values
if vars:
d.update(vars)
for i in len(values):
values[i] = self.__interpolate(values[i], d)
return values
def walk(self, section, option=None, raw=0, vars=None):
# Build dictionary for interpolation
try:
d = self.__sections_dict[section].copy()
except KeyError:
if section == DEFAULTSECT:
d = {}
else:
raise NoSectionError(section)
d.update(self.__defaults)
if vars:
d.update(vars)
# Start walking
if option:
option = self.optionxform(option)
if section != DEFAULTSECT:
for sectname, options in self.__sections_list:
if sectname == section:
for optname, value in options:
if not option or optname == option:
if not raw:
value = self.__interpolate(value, d)
yield (optname, value)
def __interpolate(self, value, vars):
rawval = value
depth = 0
while depth < 10:
depth = depth + 1
if value.find("%(") >= 0:
try:
value = value % vars
except KeyError, key:
raise InterpolationError(key, option, section, rawval)
else:
break
if value.find("%(") >= 0:
raise InterpolationDepthError(option, section, rawval)
return value
def __get(self, section, conv, option):
return conv(self.get(section, option))
def getint(self, section, option):
return self.__get(section, string.atoi, option)
def getfloat(self, section, option):
return self.__get(section, string.atof, option)
def getboolean(self, section, option):
states = {'1': 1, 'yes': 1, 'true': 1, 'on': 1,
'0': 0, 'no': 0, 'false': 0, 'off': 0}
v = self.get(section, option)
if not states.has_key(v.lower()):
raise ValueError, 'Not a boolean: %s' % v
return states[v.lower()]
def optionxform(self, optionstr):
#return optionstr.lower()
return optionstr
def has_option(self, section, option):
"""Check for the existence of a given option in a given section."""
if not section or section == "DEFAULT":
return self.__defaults.has_key(option)
elif not self.has_section(section):
return 0
else:
option = self.optionxform(option)
return self.__sections_dict[section].has_key(option)
SECTCRE = re.compile(r'\[(?P<header>[^]]+)\]')
OPTCRE = re.compile(r'(?P<option>\S+)\s*(?P<vi>[:=])\s*(?P<value>.*)$')
def __read(self, fp, fpname):
cursectdict = None # None, or a dictionary
optname = None
lineno = 0
e = None # None, or an exception
while 1:
line = fp.readline()
if not line:
break
lineno = lineno + 1
# comment or blank line?
if line.strip() == '' or line[0] in '#;':
continue
if line.split()[0].lower() == 'rem' \
and line[0] in "rR": # no leading whitespace
continue
# continuation line?
if line[0] in ' \t' and cursectdict is not None and optname:
value = line.strip()
if value:
k = self.optionxform(optname)
cursectdict[k] = "%s\n%s" % (cursectdict[k], value)
cursectlist[-1][1] = "%s\n%s" % (cursectlist[-1][1], value)
# a section header or option header?
else:
# is it a section header?
mo = self.SECTCRE.match(line)
if mo:
sectname = mo.group('header')
if self.__sections_dict.has_key(sectname):
cursectdict = self.__sections_dict[sectname]
cursectlist = []
self.__sections_list.append((sectname, cursectlist))
elif sectname == DEFAULTSECT:
cursectdict = self.__defaults
cursectlist = None
else:
cursectdict = {}
self.__sections_dict[sectname] = cursectdict
cursectlist = []
self.__sections_list.append((sectname, cursectlist))
# So sections can't start with a continuation line
optname = None
# no section header in the file?
elif cursectdict is None:
raise MissingSectionHeaderError(fpname, lineno, `line`)
# an option line?
else:
mo = self.OPTCRE.match(line)
if mo:
optname, vi, optval = mo.group('option', 'vi', 'value')
if vi in ('=', ':') and ';' in optval:
# ';' is a comment delimiter only if it follows
# a spacing character
pos = optval.find(';')
if pos and optval[pos-1] in string.whitespace:
optval = optval[:pos]
optval = optval.strip()
# allow empty values
if optval == '""':
optval = ''
xform = self.optionxform(optname)
cursectdict[xform] = optval
if cursectlist is not None:
cursectlist.append([xform, optval])
else:
# a non-fatal parsing error occurred. set up the
# exception but keep going. the exception will be
# raised at the end of the file and will contain a
# list of all bogus lines
if not e:
e = ParsingError(fpname)
e.append(lineno, `line`)
# if any parsing errors occurred, raise an exception
if e:
raise e
# Here we wrap this hacked ConfigParser into something more useful
# for us.
import os
class Config:
def __init__(self):
self._config = ConfigParser()
self._wrapped = {}
conffiles = []
repsys_conf = os.environ.get("REPSYS_CONF")
if repsys_conf:
conffiles.append(repsys_conf)
else:
conffiles.append("/etc/repsys.conf")
conffiles.append(os.path.expanduser("~/.repsys/config"))
for file in conffiles:
if os.path.isfile(file):
self._config.read(file)
def wrap(self, section, handler, option=None):
"""Set one wrapper for a given section
The wrapper must be a function
f(section, option=None, default=None, walk=False).
"""
self._wrapped[section] = handler
def sections(self):
try:
return self._config.sections()
except Error:
return []
def options(self, section):
try:
return self._config.options(section)
except Error:
return []
def set(self, section, option, value):
return self._config.set(section, option, value)
def walk(self, section, option=None, raw=0, vars=None):
handler = self._wrapped.get(section)
if handler:
return handler(section, option, walk=True)
return self._config.walk(section, option, raw, vars)
def get(self, section, option, default=None, raw=False, wrap=True):
if wrap:
handler = self._wrapped.get(section)
if handler:
handler = self._wrapped.get(section)
return handler(section, option, default)
try:
return self._config.get(section, option, raw=raw)
except Error:
return default
def getint(self, section, option, default=None):
ret = self.get(section, option, default)
if type(ret) == type(""):
return int(ret)
def getbool(self, section, option, default=None):
ret = self.get(section, option, default)
states = {'1': 1, 'yes': 1, 'true': 1, 'on': 1,
'0': 0, 'no': 0, 'false': 0, 'off': 0}
if type(ret) == type("") and states.has_key(ret.lower()):
return states[ret.lower()]
return default
def test():
config = Config()
def handler(section, option=None, default=None, walk=False):
d = {"fulano": "ciclano",
"foolano": "ceeclano"}
if walk:
return d.items()
elif option in d:
return d[option]
else:
return config.get(section, option, default, wrap=False)
config.wrap("users", handler=handler)
print config.get("users", "fulano") # found in wrapper
print config.get("users", "andreas") # found in repsys.conf
print config.walk("users")
if __name__ == "__main__":
test()
# vim:ts=4:sw=4:et
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