forked from hexparrot/mineos
/
conf_reader.py
217 lines (200 loc) · 8.91 KB
/
conf_reader.py
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"""
Subclass of Configparser for sectionless configuration files.
Implements slicing as additional get/set methods.
"""
__author__ = "William Dizon"
__license__ = "GNU GPL v3.0"
__version__ = "0.6.0"
__email__ = "wdchromium@gmail.com"
import ConfigParser
class config_file_sectionless(object):
def __init__(self, filepath):
self.filepath = open(filepath, 'r')
self.fake_section = '[sectionless]\n'
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.filepath.close()
def readline(self):
if self.fake_section:
try:
return self.fake_section
finally:
self.fake_section = None
else:
return self.filepath.readline()
class config_file(ConfigParser.SafeConfigParser):
def __init__(self, filepath=None):
ConfigParser.SafeConfigParser.__init__(self, allow_no_value=True)
self.filepath = filepath
self.use_sections(True)
try:
self.read(self.filepath)
except ConfigParser.MissingSectionHeaderError:
self.use_sections(False)
with config_file_sectionless(self.filepath) as cf:
self.readfp(cf)
except TypeError:
if filepath is not None:
raise
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.commit()
def __getitem__(self, option):
if self._use_sections:
syntax_error = "config_file get syntax: " \
"var[:] or " \
"var['section'] or " \
"var['section':'option'] or " \
"var['section':'option':'defaultval']"
if type(option) is str:
try:
return dict(self.items(option))
except ConfigParser.NoSectionError:
raise KeyError("No section: %s" % option)
elif type(option) is slice:
if type(option.start) is str and type(option.stop) is str:
try:
return self.get(option.start, option.stop)
except ConfigParser.NoSectionError:
raise KeyError(option.start)
except ConfigParser.NoOptionError:
#__getitem__ cannot return None as default argument
#because it cannot distinguish between empty slice arg
if option.step is not None:
return option.step
else:
raise KeyError(option.start)
elif type(option.start) is str and \
option.stop is None and \
option.step is None:
try:
return dict(self.items(option.start))
except ConfigParser.NoSectionError:
raise KeyError("No section: %s" % option.start)
else:
from sys import maxint
if option.start is 0 and option.stop == maxint:
return {sec:dict(self.items(sec)) for sec in self.sections()}
elif type(option.start) is not str:
raise TypeError('First argument must be string not %s' % type(option.start))
else:
raise TypeError('Second argument must be string not %s' % type(option.stop))
else:
raise TypeError(syntax_error)
else:
syntax_error = "config_file get syntax: " \
"var[:] or " \
"var['option'] or " \
"var['option'::'defaultval']"
if type(option) is str:
try:
return self.get('sectionless', option)
except ConfigParser.NoOptionError:
raise KeyError(option)
elif type(option) is slice:
if type(option.start) is str and option.stop is None:
try:
return self.get('sectionless', option.start)
except ConfigParser.NoOptionError:
#__getitem__ cannot return None as default argument
#because it cannot distinguish between empty slice arg
if option.step is not None:
return option.step
else:
raise KeyError(option.start)
else:
raise SyntaxError(syntax_error)
else:
from sys import maxint
if option.start is 0 and option.stop == maxint and option.step is None:
return dict(self.items('sectionless'))
elif option.stop is not None:
raise SyntaxError(syntax_error)
else:
raise TypeError(syntax_error)
else:
raise TypeError(syntax_error)
def __setitem__(self, option, value):
if self._use_sections:
syntax_error = "config_file set syntax: " \
"var['section':'option'] = val"
if type(option) is slice:
if option.step is not None:
raise SyntaxError(syntax_error)
elif type(option.start) is str and type(option.stop) is str:
if option.step:
raise SyntaxError(syntax_error)
else:
if type(value) in (int,str):
try:
self.set(option.start, option.stop, str(value))
except ConfigParser.NoSectionError:
raise KeyError('No section called %s' % option.start)
else:
raise ValueError('Value may only be int or string')
else:
if type(option.start) is not str:
raise TypeError('First argument must be string not %s' % type(option.start))
else:
raise TypeError('Second argument must be string not %s' % type(option.stop))
else:
raise SyntaxError(syntax_error)
else:
syntax_error = "config_file set syntax: " \
"var['option'] = val"
if type(option) is str:
self.set('sectionless', str(option), str(value))
elif type(option) is slice:
raise SyntaxError(syntax_error)
else:
raise TypeError('Inappropriate argument type: %s' % type(option))
def __delitem__(self, option):
if self._use_sections:
syntax_error = "config_file del syntax: " \
"del var['section':'option']"
if type(option) is slice:
if option.step is not None:
raise SyntaxError(syntax_error)
elif option.stop is None:
raise SyntaxError(syntax_error)
elif type(option.start) is str and type(option.stop) is str:
try:
self.remove_option(option.start, option.stop)
except ConfigParser.NoSectionError:
raise KeyError(option.start)
elif type(option.start) is not str:
raise TypeError('Inappropriate argument type: %s' % type(option.start))
else:
raise TypeError('Inappropriate argument type: %s' % type(option.stop))
else:
raise SyntaxError(syntax_error)
else:
syntax_error = "config_file del syntax: " \
"del var['option']"
if type(option) is str:
self.remove_option('sectionless', str(option))
elif type(option) is slice:
raise SyntaxError(syntax_error)
else:
raise TypeError('Inappropriate argument type: %s' % type(option))
def commit(self):
if self._use_sections:
with open(self.filepath, 'wb') as configfile:
self.write(configfile)
else:
with open(self.filepath, "w") as configfile:
for k,v in self.items('sectionless'):
configfile.write("%s=%s\n" % (k.strip(), v.strip()))
def use_sections(self, value):
if value:
self.remove_section('sectionless')
self._use_sections = True
else:
try:
self.add_section('sectionless')
except ConfigParser.DuplicateSectionError:
pass
finally:
self._use_sections = False