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""" 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 = 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: str, 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 = 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 = 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 re-combinate 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)