530 lines
19 KiB
Python
530 lines
19 KiB
Python
|
"""
|
||
|
|
This module started out as largely a copy paste from the stdlib's
|
||
|
|
optparse module with the features removed that we do not need from
|
||
|
|
optparse because we implement them in Click on a higher level (for
|
||
|
|
instance type handling, help formatting and a lot more).
|
||
|
|
|
||
|
|
The plan is to remove more and more from here over time.
|
||
|
|
|
||
|
|
The reason this is a different module and not optparse from the stdlib
|
||
|
|
is that there are differences in 2.x and 3.x about the error messages
|
||
|
|
generated and optparse in the stdlib uses gettext for no good reason
|
||
|
|
and might cause us issues.
|
||
|
|
|
||
|
|
Click uses parts of optparse written by Gregory P. Ward and maintained
|
||
|
|
by the Python Software Foundation. This is limited to code in parser.py.
|
||
|
|
|
||
|
|
Copyright 2001-2006 Gregory P. Ward. All rights reserved.
|
||
|
|
Copyright 2002-2006 Python Software Foundation. All rights reserved.
|
||
|
|
"""
|
||
|
|
# This code uses parts of optparse written by Gregory P. Ward and
|
||
|
|
# maintained by the Python Software Foundation.
|
||
|
|
# Copyright 2001-2006 Gregory P. Ward
|
||
|
|
# Copyright 2002-2006 Python Software Foundation
|
||
|
|
import typing as t
|
||
|
|
from collections import deque
|
||
|
|
from gettext import gettext as _
|
||
|
|
from gettext import ngettext
|
||
|
|
|
||
|
|
from .exceptions import BadArgumentUsage
|
||
|
|
from .exceptions import BadOptionUsage
|
||
|
|
from .exceptions import NoSuchOption
|
||
|
|
from .exceptions import UsageError
|
||
|
|
|
||
|
|
if t.TYPE_CHECKING:
|
||
|
|
import typing_extensions as te
|
||
|
|
from .core import Argument as CoreArgument
|
||
|
|
from .core import Context
|
||
|
|
from .core import Option as CoreOption
|
||
|
|
from .core import Parameter as CoreParameter
|
||
|
|
|
||
|
|
V = t.TypeVar("V")
|
||
|
|
|
||
|
|
# Sentinel value that indicates an option was passed as a flag without a
|
||
|
|
# value but is not a flag option. Option.consume_value uses this to
|
||
|
|
# prompt or use the flag_value.
|
||
|
|
_flag_needs_value = object()
|
||
|
|
|
||
|
|
|
||
|
|
def _unpack_args(
|
||
|
|
args: t.Sequence[str], nargs_spec: t.Sequence[int]
|
||
|
|
) -> t.Tuple[t.Sequence[t.Union[str, t.Sequence[t.Optional[str]], None]], t.List[str]]:
|
||
|
|
"""Given an iterable of arguments and an iterable of nargs specifications,
|
||
|
|
it returns a tuple with all the unpacked arguments at the first index
|
||
|
|
and all remaining arguments as the second.
|
||
|
|
|
||
|
|
The nargs specification is the number of arguments that should be consumed
|
||
|
|
or `-1` to indicate that this position should eat up all the remainders.
|
||
|
|
|
||
|
|
Missing items are filled with `None`.
|
||
|
|
"""
|
||
|
|
args = deque(args)
|
||
|
|
nargs_spec = deque(nargs_spec)
|
||
|
|
rv: t.List[t.Union[str, t.Tuple[t.Optional[str], ...], None]] = []
|
||
|
|
spos: t.Optional[int] = None
|
||
|
|
|
||
|
|
def _fetch(c: "te.Deque[V]") -> t.Optional[V]:
|
||
|
|
try:
|
||
|
|
if spos is None:
|
||
|
|
return c.popleft()
|
||
|
|
else:
|
||
|
|
return c.pop()
|
||
|
|
except IndexError:
|
||
|
|
return None
|
||
|
|
|
||
|
|
while nargs_spec:
|
||
|
|
nargs = _fetch(nargs_spec)
|
||
|
|
|
||
|
|
if nargs is None:
|
||
|
|
continue
|
||
|
|
|
||
|
|
if nargs == 1:
|
||
|
|
rv.append(_fetch(args))
|
||
|
|
elif nargs > 1:
|
||
|
|
x = [_fetch(args) for _ in range(nargs)]
|
||
|
|
|
||
|
|
# If we're reversed, we're pulling in the arguments in reverse,
|
||
|
|
# so we need to turn them around.
|
||
|
|
if spos is not None:
|
||
|
|
x.reverse()
|
||
|
|
|
||
|
|
rv.append(tuple(x))
|
||
|
|
elif nargs < 0:
|
||
|
|
if spos is not None:
|
||
|
|
raise TypeError("Cannot have two nargs < 0")
|
||
|
|
|
||
|
|
spos = len(rv)
|
||
|
|
rv.append(None)
|
||
|
|
|
||
|
|
# spos is the position of the wildcard (star). If it's not `None`,
|
||
|
|
# we fill it with the remainder.
|
||
|
|
if spos is not None:
|
||
|
|
rv[spos] = tuple(args)
|
||
|
|
args = []
|
||
|
|
rv[spos + 1 :] = reversed(rv[spos + 1 :])
|
||
|
|
|
||
|
|
return tuple(rv), list(args)
|
||
|
|
|
||
|
|
|
||
|
|
def split_opt(opt: str) -> t.Tuple[str, str]:
|
||
|
|
first = opt[:1]
|
||
|
|
if first.isalnum():
|
||
|
|
return "", opt
|
||
|
|
if opt[1:2] == first:
|
||
|
|
return opt[:2], opt[2:]
|
||
|
|
return first, opt[1:]
|
||
|
|
|
||
|
|
|
||
|
|
def normalize_opt(opt: str, ctx: t.Optional["Context"]) -> str:
|
||
|
|
if ctx is None or ctx.token_normalize_func is None:
|
||
|
|
return opt
|
||
|
|
prefix, opt = split_opt(opt)
|
||
|
|
return f"{prefix}{ctx.token_normalize_func(opt)}"
|
||
|
|
|
||
|
|
|
||
|
|
def split_arg_string(string: str) -> t.List[str]:
|
||
|
|
"""Split an argument string as with :func:`shlex.split`, but don't
|
||
|
|
fail if the string is incomplete. Ignores a missing closing quote or
|
||
|
|
incomplete escape sequence and uses the partial token as-is.
|
||
|
|
|
||
|
|
.. code-block:: python
|
||
|
|
|
||
|
|
split_arg_string("example 'my file")
|
||
|
|
["example", "my file"]
|
||
|
|
|
||
|
|
split_arg_string("example my\\")
|
||
|
|
["example", "my"]
|
||
|
|
|
||
|
|
:param string: String to split.
|
||
|
|
"""
|
||
|
|
import shlex
|
||
|
|
|
||
|
|
lex = shlex.shlex(string, posix=True)
|
||
|
|
lex.whitespace_split = True
|
||
|
|
lex.commenters = ""
|
||
|
|
out = []
|
||
|
|
|
||
|
|
try:
|
||
|
|
for token in lex:
|
||
|
|
out.append(token)
|
||
|
|
except ValueError:
|
||
|
|
# Raised when end-of-string is reached in an invalid state. Use
|
||
|
|
# the partial token as-is. The quote or escape character is in
|
||
|
|
# lex.state, not lex.token.
|
||
|
|
out.append(lex.token)
|
||
|
|
|
||
|
|
return out
|
||
|
|
|
||
|
|
|
||
|
|
class Option:
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
obj: "CoreOption",
|
||
|
|
opts: t.Sequence[str],
|
||
|
|
dest: t.Optional[str],
|
||
|
|
action: t.Optional[str] = None,
|
||
|
|
nargs: int = 1,
|
||
|
|
const: t.Optional[t.Any] = None,
|
||
|
|
):
|
||
|
|
self._short_opts = []
|
||
|
|
self._long_opts = []
|
||
|
|
self.prefixes: t.Set[str] = set()
|
||
|
|
|
||
|
|
for opt in opts:
|
||
|
|
prefix, value = split_opt(opt)
|
||
|
|
if not prefix:
|
||
|
|
raise ValueError(f"Invalid start character for option ({opt})")
|
||
|
|
self.prefixes.add(prefix[0])
|
||
|
|
if len(prefix) == 1 and len(value) == 1:
|
||
|
|
self._short_opts.append(opt)
|
||
|
|
else:
|
||
|
|
self._long_opts.append(opt)
|
||
|
|
self.prefixes.add(prefix)
|
||
|
|
|
||
|
|
if action is None:
|
||
|
|
action = "store"
|
||
|
|
|
||
|
|
self.dest = dest
|
||
|
|
self.action = action
|
||
|
|
self.nargs = nargs
|
||
|
|
self.const = const
|
||
|
|
self.obj = obj
|
||
|
|
|
||
|
|
@property
|
||
|
|
def takes_value(self) -> bool:
|
||
|
|
return self.action in ("store", "append")
|
||
|
|
|
||
|
|
def process(self, value: t.Any, state: "ParsingState") -> None:
|
||
|
|
if self.action == "store":
|
||
|
|
state.opts[self.dest] = value # type: ignore
|
||
|
|
elif self.action == "store_const":
|
||
|
|
state.opts[self.dest] = self.const # type: ignore
|
||
|
|
elif self.action == "append":
|
||
|
|
state.opts.setdefault(self.dest, []).append(value) # type: ignore
|
||
|
|
elif self.action == "append_const":
|
||
|
|
state.opts.setdefault(self.dest, []).append(self.const) # type: ignore
|
||
|
|
elif self.action == "count":
|
||
|
|
state.opts[self.dest] = state.opts.get(self.dest, 0) + 1 # type: ignore
|
||
|
|
else:
|
||
|
|
raise ValueError(f"unknown action '{self.action}'")
|
||
|
|
state.order.append(self.obj)
|
||
|
|
|
||
|
|
|
||
|
|
class Argument:
|
||
|
|
def __init__(self, obj: "CoreArgument", dest: t.Optional[str], nargs: int = 1):
|
||
|
|
self.dest = dest
|
||
|
|
self.nargs = nargs
|
||
|
|
self.obj = obj
|
||
|
|
|
||
|
|
def process(
|
||
|
|
self,
|
||
|
|
value: t.Union[t.Optional[str], t.Sequence[t.Optional[str]]],
|
||
|
|
state: "ParsingState",
|
||
|
|
) -> None:
|
||
|
|
if self.nargs > 1:
|
||
|
|
assert value is not None
|
||
|
|
holes = sum(1 for x in value if x is None)
|
||
|
|
if holes == len(value):
|
||
|
|
value = None
|
||
|
|
elif holes != 0:
|
||
|
|
raise BadArgumentUsage(
|
||
|
|
_("Argument {name!r} takes {nargs} values.").format(
|
||
|
|
name=self.dest, nargs=self.nargs
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|
||
|
|
if self.nargs == -1 and self.obj.envvar is not None and value == ():
|
||
|
|
# Replace empty tuple with None so that a value from the
|
||
|
|
# environment may be tried.
|
||
|
|
value = None
|
||
|
|
|
||
|
|
state.opts[self.dest] = value # type: ignore
|
||
|
|
state.order.append(self.obj)
|
||
|
|
|
||
|
|
|
||
|
|
class ParsingState:
|
||
|
|
def __init__(self, rargs: t.List[str]) -> None:
|
||
|
|
self.opts: t.Dict[str, t.Any] = {}
|
||
|
|
self.largs: t.List[str] = []
|
||
|
|
self.rargs = rargs
|
||
|
|
self.order: t.List["CoreParameter"] = []
|
||
|
|
|
||
|
|
|
||
|
|
class OptionParser:
|
||
|
|
"""The option parser is an internal class that is ultimately used to
|
||
|
|
parse options and arguments. It's modelled after optparse and brings
|
||
|
|
a similar but vastly simplified API. It should generally not be used
|
||
|
|
directly as the high level Click classes wrap it for you.
|
||
|
|
|
||
|
|
It's not nearly as extensible as optparse or argparse as it does not
|
||
|
|
implement features that are implemented on a higher level (such as
|
||
|
|
types or defaults).
|
||
|
|
|
||
|
|
:param ctx: optionally the :class:`~click.Context` where this parser
|
||
|
|
should go with.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, ctx: t.Optional["Context"] = None) -> None:
|
||
|
|
#: The :class:`~click.Context` for this parser. This might be
|
||
|
|
#: `None` for some advanced use cases.
|
||
|
|
self.ctx = ctx
|
||
|
|
#: This controls how the parser deals with interspersed arguments.
|
||
|
|
#: If this is set to `False`, the parser will stop on the first
|
||
|
|
#: non-option. Click uses this to implement nested subcommands
|
||
|
|
#: safely.
|
||
|
|
self.allow_interspersed_args: bool = True
|
||
|
|
#: This tells the parser how to deal with unknown options. By
|
||
|
|
#: default it will error out (which is sensible), but there is a
|
||
|
|
#: second mode where it will ignore it and continue processing
|
||
|
|
#: after shifting all the unknown options into the resulting args.
|
||
|
|
self.ignore_unknown_options: bool = False
|
||
|
|
|
||
|
|
if ctx is not None:
|
||
|
|
self.allow_interspersed_args = ctx.allow_interspersed_args
|
||
|
|
self.ignore_unknown_options = ctx.ignore_unknown_options
|
||
|
|
|
||
|
|
self._short_opt: t.Dict[str, Option] = {}
|
||
|
|
self._long_opt: t.Dict[str, Option] = {}
|
||
|
|
self._opt_prefixes = {"-", "--"}
|
||
|
|
self._args: t.List[Argument] = []
|
||
|
|
|
||
|
|
def add_option(
|
||
|
|
self,
|
||
|
|
obj: "CoreOption",
|
||
|
|
opts: t.Sequence[str],
|
||
|
|
dest: t.Optional[str],
|
||
|
|
action: t.Optional[str] = None,
|
||
|
|
nargs: int = 1,
|
||
|
|
const: t.Optional[t.Any] = None,
|
||
|
|
) -> None:
|
||
|
|
"""Adds a new option named `dest` to the parser. The destination
|
||
|
|
is not inferred (unlike with optparse) and needs to be explicitly
|
||
|
|
provided. Action can be any of ``store``, ``store_const``,
|
||
|
|
``append``, ``append_const`` or ``count``.
|
||
|
|
|
||
|
|
The `obj` can be used to identify the option in the order list
|
||
|
|
that is returned from the parser.
|
||
|
|
"""
|
||
|
|
opts = [normalize_opt(opt, self.ctx) for opt in opts]
|
||
|
|
option = Option(obj, opts, dest, action=action, nargs=nargs, const=const)
|
||
|
|
self._opt_prefixes.update(option.prefixes)
|
||
|
|
for opt in option._short_opts:
|
||
|
|
self._short_opt[opt] = option
|
||
|
|
for opt in option._long_opts:
|
||
|
|
self._long_opt[opt] = option
|
||
|
|
|
||
|
|
def add_argument(
|
||
|
|
self, obj: "CoreArgument", dest: t.Optional[str], nargs: int = 1
|
||
|
|
) -> None:
|
||
|
|
"""Adds a positional argument named `dest` to the parser.
|
||
|
|
|
||
|
|
The `obj` can be used to identify the option in the order list
|
||
|
|
that is returned from the parser.
|
||
|
|
"""
|
||
|
|
self._args.append(Argument(obj, dest=dest, nargs=nargs))
|
||
|
|
|
||
|
|
def parse_args(
|
||
|
|
self, args: t.List[str]
|
||
|
|
) -> t.Tuple[t.Dict[str, t.Any], t.List[str], t.List["CoreParameter"]]:
|
||
|
|
"""Parses positional arguments and returns ``(values, args, order)``
|
||
|
|
for the parsed options and arguments as well as the leftover
|
||
|
|
arguments if there are any. The order is a list of objects as they
|
||
|
|
appear on the command line. If arguments appear multiple times they
|
||
|
|
will be memorized multiple times as well.
|
||
|
|
"""
|
||
|
|
state = ParsingState(args)
|
||
|
|
try:
|
||
|
|
self._process_args_for_options(state)
|
||
|
|
self._process_args_for_args(state)
|
||
|
|
except UsageError:
|
||
|
|
if self.ctx is None or not self.ctx.resilient_parsing:
|
||
|
|
raise
|
||
|
|
return state.opts, state.largs, state.order
|
||
|
|
|
||
|
|
def _process_args_for_args(self, state: ParsingState) -> None:
|
||
|
|
pargs, args = _unpack_args(
|
||
|
|
state.largs + state.rargs, [x.nargs for x in self._args]
|
||
|
|
)
|
||
|
|
|
||
|
|
for idx, arg in enumerate(self._args):
|
||
|
|
arg.process(pargs[idx], state)
|
||
|
|
|
||
|
|
state.largs = args
|
||
|
|
state.rargs = []
|
||
|
|
|
||
|
|
def _process_args_for_options(self, state: ParsingState) -> None:
|
||
|
|
while state.rargs:
|
||
|
|
arg = state.rargs.pop(0)
|
||
|
|
arglen = len(arg)
|
||
|
|
# Double dashes always handled explicitly regardless of what
|
||
|
|
# prefixes are valid.
|
||
|
|
if arg == "--":
|
||
|
|
return
|
||
|
|
elif arg[:1] in self._opt_prefixes and arglen > 1:
|
||
|
|
self._process_opts(arg, state)
|
||
|
|
elif self.allow_interspersed_args:
|
||
|
|
state.largs.append(arg)
|
||
|
|
else:
|
||
|
|
state.rargs.insert(0, arg)
|
||
|
|
return
|
||
|
|
|
||
|
|
# Say this is the original argument list:
|
||
|
|
# [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)]
|
||
|
|
# ^
|
||
|
|
# (we are about to process arg(i)).
|
||
|
|
#
|
||
|
|
# Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of
|
||
|
|
# [arg0, ..., arg(i-1)] (any options and their arguments will have
|
||
|
|
# been removed from largs).
|
||
|
|
#
|
||
|
|
# The while loop will usually consume 1 or more arguments per pass.
|
||
|
|
# If it consumes 1 (eg. arg is an option that takes no arguments),
|
||
|
|
# then after _process_arg() is done the situation is:
|
||
|
|
#
|
||
|
|
# largs = subset of [arg0, ..., arg(i)]
|
||
|
|
# rargs = [arg(i+1), ..., arg(N-1)]
|
||
|
|
#
|
||
|
|
# If allow_interspersed_args is false, largs will always be
|
||
|
|
# *empty* -- still a subset of [arg0, ..., arg(i-1)], but
|
||
|
|
# not a very interesting subset!
|
||
|
|
|
||
|
|
def _match_long_opt(
|
||
|
|
self, opt: str, explicit_value: t.Optional[str], state: ParsingState
|
||
|
|
) -> None:
|
||
|
|
if opt not in self._long_opt:
|
||
|
|
from difflib import get_close_matches
|
||
|
|
|
||
|
|
possibilities = get_close_matches(opt, self._long_opt)
|
||
|
|
raise NoSuchOption(opt, possibilities=possibilities, ctx=self.ctx)
|
||
|
|
|
||
|
|
option = self._long_opt[opt]
|
||
|
|
if option.takes_value:
|
||
|
|
# At this point it's safe to modify rargs by injecting the
|
||
|
|
# explicit value, because no exception is raised in this
|
||
|
|
# branch. This means that the inserted value will be fully
|
||
|
|
# consumed.
|
||
|
|
if explicit_value is not None:
|
||
|
|
state.rargs.insert(0, explicit_value)
|
||
|
|
|
||
|
|
value = self._get_value_from_state(opt, option, state)
|
||
|
|
|
||
|
|
elif explicit_value is not None:
|
||
|
|
raise BadOptionUsage(
|
||
|
|
opt, _("Option {name!r} does not take a value.").format(name=opt)
|
||
|
|
)
|
||
|
|
|
||
|
|
else:
|
||
|
|
value = None
|
||
|
|
|
||
|
|
option.process(value, state)
|
||
|
|
|
||
|
|
def _match_short_opt(self, arg: str, state: ParsingState) -> None:
|
||
|
|
stop = False
|
||
|
|
i = 1
|
||
|
|
prefix = arg[0]
|
||
|
|
unknown_options = []
|
||
|
|
|
||
|
|
for ch in arg[1:]:
|
||
|
|
opt = normalize_opt(f"{prefix}{ch}", self.ctx)
|
||
|
|
option = self._short_opt.get(opt)
|
||
|
|
i += 1
|
||
|
|
|
||
|
|
if not option:
|
||
|
|
if self.ignore_unknown_options:
|
||
|
|
unknown_options.append(ch)
|
||
|
|
continue
|
||
|
|
raise NoSuchOption(opt, ctx=self.ctx)
|
||
|
|
if option.takes_value:
|
||
|
|
# Any characters left in arg? Pretend they're the
|
||
|
|
# next arg, and stop consuming characters of arg.
|
||
|
|
if i < len(arg):
|
||
|
|
state.rargs.insert(0, arg[i:])
|
||
|
|
stop = True
|
||
|
|
|
||
|
|
value = self._get_value_from_state(opt, option, state)
|
||
|
|
|
||
|
|
else:
|
||
|
|
value = None
|
||
|
|
|
||
|
|
option.process(value, state)
|
||
|
|
|
||
|
|
if stop:
|
||
|
|
break
|
||
|
|
|
||
|
|
# If we got any unknown options we recombine the string of the
|
||
|
|
# remaining options and re-attach the prefix, then report that
|
||
|
|
# to the state as new larg. This way there is basic combinatorics
|
||
|
|
# that can be achieved while still ignoring unknown arguments.
|
||
|
|
if self.ignore_unknown_options and unknown_options:
|
||
|
|
state.largs.append(f"{prefix}{''.join(unknown_options)}")
|
||
|
|
|
||
|
|
def _get_value_from_state(
|
||
|
|
self, option_name: str, option: Option, state: ParsingState
|
||
|
|
) -> t.Any:
|
||
|
|
nargs = option.nargs
|
||
|
|
|
||
|
|
if len(state.rargs) < nargs:
|
||
|
|
if option.obj._flag_needs_value:
|
||
|
|
# Option allows omitting the value.
|
||
|
|
value = _flag_needs_value
|
||
|
|
else:
|
||
|
|
raise BadOptionUsage(
|
||
|
|
option_name,
|
||
|
|
ngettext(
|
||
|
|
"Option {name!r} requires an argument.",
|
||
|
|
"Option {name!r} requires {nargs} arguments.",
|
||
|
|
nargs,
|
||
|
|
).format(name=option_name, nargs=nargs),
|
||
|
|
)
|
||
|
|
elif nargs == 1:
|
||
|
|
next_rarg = state.rargs[0]
|
||
|
|
|
||
|
|
if (
|
||
|
|
option.obj._flag_needs_value
|
||
|
|
and isinstance(next_rarg, str)
|
||
|
|
and next_rarg[:1] in self._opt_prefixes
|
||
|
|
and len(next_rarg) > 1
|
||
|
|
):
|
||
|
|
# The next arg looks like the start of an option, don't
|
||
|
|
# use it as the value if omitting the value is allowed.
|
||
|
|
value = _flag_needs_value
|
||
|
|
else:
|
||
|
|
value = state.rargs.pop(0)
|
||
|
|
else:
|
||
|
|
value = tuple(state.rargs[:nargs])
|
||
|
|
del state.rargs[:nargs]
|
||
|
|
|
||
|
|
return value
|
||
|
|
|
||
|
|
def _process_opts(self, arg: str, state: ParsingState) -> None:
|
||
|
|
explicit_value = None
|
||
|
|
# Long option handling happens in two parts. The first part is
|
||
|
|
# supporting explicitly attached values. In any case, we will try
|
||
|
|
# to long match the option first.
|
||
|
|
if "=" in arg:
|
||
|
|
long_opt, explicit_value = arg.split("=", 1)
|
||
|
|
else:
|
||
|
|
long_opt = arg
|
||
|
|
norm_long_opt = normalize_opt(long_opt, self.ctx)
|
||
|
|
|
||
|
|
# At this point we will match the (assumed) long option through
|
||
|
|
# the long option matching code. Note that this allows options
|
||
|
|
# like "-foo" to be matched as long options.
|
||
|
|
try:
|
||
|
|
self._match_long_opt(norm_long_opt, explicit_value, state)
|
||
|
|
except NoSuchOption:
|
||
|
|
# At this point the long option matching failed, and we need
|
||
|
|
# to try with short options. However there is a special rule
|
||
|
|
# which says, that if we have a two character options prefix
|
||
|
|
# (applies to "--foo" for instance), we do not dispatch to the
|
||
|
|
# short option code and will instead raise the no option
|
||
|
|
# error.
|
||
|
|
if arg[:2] not in self._opt_prefixes:
|
||
|
|
self._match_short_opt(arg, state)
|
||
|
|
return
|
||
|
|
|
||
|
|
if not self.ignore_unknown_options:
|
||
|
|
raise
|
||
|
|
|
||
|
|
state.largs.append(arg)
|