/usr/lib/python3/dist-packages/argcomplete/my_argparse.py is in python3-argcomplete 1.8.1-1ubuntu1.
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# Licensed under the Apache License. See https://github.com/kislyuk/argcomplete for more info.
from argparse import ArgumentParser, ArgumentError, SUPPRESS, _SubParsersAction
from argparse import OPTIONAL, ZERO_OR_MORE, ONE_OR_MORE, REMAINDER, PARSER
from argparse import _get_action_name, _
_num_consumed_args = {}
def action_is_satisfied(action):
''' Returns False if the parse would raise an error if no more arguments are given to this action, True otherwise.
'''
num_consumed_args = _num_consumed_args.get(action, 0)
if action.nargs in [OPTIONAL, ZERO_OR_MORE, REMAINDER]:
return True
if action.nargs == ONE_OR_MORE:
return num_consumed_args >= 1
if action.nargs == PARSER:
# Not sure what this should be, but this previously always returned False
# so at least this won't break anything that wasn't already broken.
return False
if action.nargs is None:
return num_consumed_args == 1
assert isinstance(action.nargs, int), 'failed to handle a possible nargs value: %r' % action.nargs
return num_consumed_args == action.nargs
def action_is_open(action):
''' Returns True if action could consume more arguments (i.e., its pattern is open).
'''
num_consumed_args = _num_consumed_args.get(action, 0)
if action.nargs in [ZERO_OR_MORE, ONE_OR_MORE, PARSER, REMAINDER]:
return True
if action.nargs == OPTIONAL or action.nargs is None:
return num_consumed_args == 0
assert isinstance(action.nargs, int), 'failed to handle a possible nargs value: %r' % action.nargs
return num_consumed_args < action.nargs
def action_is_greedy(action, isoptional=False):
''' Returns True if action will necessarily consume the next argument.
isoptional indicates whether the argument is an optional (starts with -).
'''
num_consumed_args = _num_consumed_args.get(action, 0)
if action.option_strings:
if not isoptional and not action_is_satisfied(action):
return True
return action.nargs == REMAINDER
else:
return action.nargs == REMAINDER and num_consumed_args >= 1
class IntrospectiveArgumentParser(ArgumentParser):
''' The following is a verbatim copy of ArgumentParser._parse_known_args (Python 2.7.3),
except for the lines that contain the string "Added by argcomplete".
'''
def _parse_known_args(self, arg_strings, namespace):
_num_consumed_args.clear() # Added by argcomplete
self._argcomplete_namespace = namespace
self.active_actions = [] # Added by argcomplete
# replace arg strings that are file references
if self.fromfile_prefix_chars is not None:
arg_strings = self._read_args_from_files(arg_strings)
# map all mutually exclusive arguments to the other arguments
# they can't occur with
action_conflicts = {}
self._action_conflicts = action_conflicts # Added by argcomplete
for mutex_group in self._mutually_exclusive_groups:
group_actions = mutex_group._group_actions
for i, mutex_action in enumerate(mutex_group._group_actions):
conflicts = action_conflicts.setdefault(mutex_action, [])
conflicts.extend(group_actions[:i])
conflicts.extend(group_actions[i + 1:])
# find all option indices, and determine the arg_string_pattern
# which has an 'O' if there is an option at an index,
# an 'A' if there is an argument, or a '-' if there is a '--'
option_string_indices = {}
arg_string_pattern_parts = []
arg_strings_iter = iter(arg_strings)
for i, arg_string in enumerate(arg_strings_iter):
# all args after -- are non-options
if arg_string == '--':
arg_string_pattern_parts.append('-')
for arg_string in arg_strings_iter:
arg_string_pattern_parts.append('A')
# otherwise, add the arg to the arg strings
# and note the index if it was an option
else:
option_tuple = self._parse_optional(arg_string)
if option_tuple is None:
pattern = 'A'
else:
option_string_indices[i] = option_tuple
pattern = 'O'
arg_string_pattern_parts.append(pattern)
# join the pieces together to form the pattern
arg_strings_pattern = ''.join(arg_string_pattern_parts)
# converts arg strings to the appropriate and then takes the action
seen_actions = set()
seen_non_default_actions = set()
self._seen_non_default_actions = seen_non_default_actions # Added by argcomplete
def take_action(action, argument_strings, option_string=None):
seen_actions.add(action)
argument_values = self._get_values(action, argument_strings)
# error if this argument is not allowed with other previously
# seen arguments, assuming that actions that use the default
# value don't really count as "present"
if argument_values is not action.default:
seen_non_default_actions.add(action)
for conflict_action in action_conflicts.get(action, []):
if conflict_action in seen_non_default_actions:
msg = _('not allowed with argument %s')
action_name = _get_action_name(conflict_action)
raise ArgumentError(action, msg % action_name)
# take the action if we didn't receive a SUPPRESS value
# (e.g. from a default)
if argument_values is not SUPPRESS \
or isinstance(action, _SubParsersAction):
try:
action(self, namespace, argument_values, option_string)
except:
# Begin added by argcomplete
# When a subparser action is taken and fails due to incomplete arguments, it does not merge the
# contents of its parsed namespace into the parent namespace. Do that here to allow completers to
# access the partially parsed arguments for the subparser.
if isinstance(action, _SubParsersAction):
subnamespace = action._name_parser_map[argument_values[0]]._argcomplete_namespace
for key, value in vars(subnamespace).items():
setattr(namespace, key, value)
# End added by argcomplete
raise
# function to convert arg_strings into an optional action
def consume_optional(start_index):
# get the optional identified at this index
option_tuple = option_string_indices[start_index]
action, option_string, explicit_arg = option_tuple
# identify additional optionals in the same arg string
# (e.g. -xyz is the same as -x -y -z if no args are required)
match_argument = self._match_argument
action_tuples = []
while True:
# if we found no optional action, skip it
if action is None:
extras.append(arg_strings[start_index])
return start_index + 1
# if there is an explicit argument, try to match the
# optional's string arguments to only this
if explicit_arg is not None:
arg_count = match_argument(action, 'A')
# if the action is a single-dash option and takes no
# arguments, try to parse more single-dash options out
# of the tail of the option string
chars = self.prefix_chars
if arg_count == 0 and option_string[1] not in chars:
action_tuples.append((action, [], option_string))
char = option_string[0]
option_string = char + explicit_arg[0]
new_explicit_arg = explicit_arg[1:] or None
optionals_map = self._option_string_actions
if option_string in optionals_map:
action = optionals_map[option_string]
explicit_arg = new_explicit_arg
else:
msg = _('ignored explicit argument %r')
raise ArgumentError(action, msg % explicit_arg)
# if the action expect exactly one argument, we've
# successfully matched the option; exit the loop
elif arg_count == 1:
stop = start_index + 1
args = [explicit_arg]
action_tuples.append((action, args, option_string))
break
# error if a double-dash option did not use the
# explicit argument
else:
msg = _('ignored explicit argument %r')
raise ArgumentError(action, msg % explicit_arg)
# if there is no explicit argument, try to match the
# optional's string arguments with the following strings
# if successful, exit the loop
else:
start = start_index + 1
selected_patterns = arg_strings_pattern[start:]
self.active_actions = [action] # Added by argcomplete
_num_consumed_args[action] = 0 # Added by argcomplete
arg_count = match_argument(action, selected_patterns)
stop = start + arg_count
args = arg_strings[start:stop]
# Begin added by argcomplete
# If the pattern is not open (e.g. no + at the end), remove the action from active actions (since
# it wouldn't be able to consume any more args)
_num_consumed_args[action] = len(args)
if not action_is_open(action):
self.active_actions.remove(action)
# End added by argcomplete
action_tuples.append((action, args, option_string))
break
# add the Optional to the list and return the index at which
# the Optional's string args stopped
assert action_tuples
for action, args, option_string in action_tuples:
take_action(action, args, option_string)
return stop
# the list of Positionals left to be parsed; this is modified
# by consume_positionals()
positionals = self._get_positional_actions()
# function to convert arg_strings into positional actions
def consume_positionals(start_index):
# match as many Positionals as possible
match_partial = self._match_arguments_partial
selected_pattern = arg_strings_pattern[start_index:]
arg_counts = match_partial(positionals, selected_pattern)
# slice off the appropriate arg strings for each Positional
# and add the Positional and its args to the list
for action, arg_count in zip(positionals, arg_counts): # Added by argcomplete
self.active_actions.append(action) # Added by argcomplete
for action, arg_count in zip(positionals, arg_counts):
args = arg_strings[start_index: start_index + arg_count]
start_index += arg_count
_num_consumed_args[action] = len(args) # Added by argcomplete
take_action(action, args)
# slice off the Positionals that we just parsed and return the
# index at which the Positionals' string args stopped
positionals[:] = positionals[len(arg_counts):]
return start_index
# consume Positionals and Optionals alternately, until we have
# passed the last option string
extras = []
start_index = 0
if option_string_indices:
max_option_string_index = max(option_string_indices)
else:
max_option_string_index = -1
while start_index <= max_option_string_index:
# consume any Positionals preceding the next option
next_option_string_index = min([
index
for index in option_string_indices
if index >= start_index])
if start_index != next_option_string_index:
positionals_end_index = consume_positionals(start_index)
# only try to parse the next optional if we didn't consume
# the option string during the positionals parsing
if positionals_end_index > start_index:
start_index = positionals_end_index
continue
else:
start_index = positionals_end_index
# if we consumed all the positionals we could and we're not
# at the index of an option string, there were extra arguments
if start_index not in option_string_indices:
strings = arg_strings[start_index:next_option_string_index]
extras.extend(strings)
start_index = next_option_string_index
# consume the next optional and any arguments for it
start_index = consume_optional(start_index)
# consume any positionals following the last Optional
stop_index = consume_positionals(start_index)
# if we didn't consume all the argument strings, there were extras
extras.extend(arg_strings[stop_index:])
# if we didn't use all the Positional objects, there were too few
# arg strings supplied.
if positionals:
self.active_actions.append(positionals[0]) # Added by argcomplete
self.error(_('too few arguments'))
# make sure all required actions were present
for action in self._actions:
if action.required:
if action not in seen_actions:
name = _get_action_name(action)
self.error(_('argument %s is required') % name)
# make sure all required groups had one option present
for group in self._mutually_exclusive_groups:
if group.required:
for action in group._group_actions:
if action in seen_non_default_actions:
break
# if no actions were used, report the error
else:
names = [_get_action_name(action)
for action in group._group_actions
if action.help is not SUPPRESS]
msg = _('one of the arguments %s is required')
self.error(msg % ' '.join(names))
# return the updated namespace and the extra arguments
return namespace, extras
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