533 lines
19 KiB
Python
533 lines
19 KiB
Python
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"""
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This module started out as largely a copy paste from the stdlib's
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optparse module with the features removed that we do not need from
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optparse because we implement them in Click on a higher level (for
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instance type handling, help formatting and a lot more).
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The plan is to remove more and more from here over time.
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The reason this is a different module and not optparse from the stdlib
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is that there are differences in 2.x and 3.x about the error messages
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generated and optparse in the stdlib uses gettext for no good reason
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and might cause us issues.
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Click uses parts of optparse written by Gregory P. Ward and maintained
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by the Python Software Foundation. This is limited to code in parser.py.
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Copyright 2001-2006 Gregory P. Ward. All rights reserved.
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Copyright 2002-2006 Python Software Foundation. All rights reserved.
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"""
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# This code uses parts of optparse written by Gregory P. Ward and
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# maintained by the Python Software Foundation.
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# Copyright 2001-2006 Gregory P. Ward
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# Copyright 2002-2006 Python Software Foundation
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from __future__ import annotations
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import collections.abc as cabc
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import typing as t
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from collections import deque
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from gettext import gettext as _
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from gettext import ngettext
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from ._utils import FLAG_NEEDS_VALUE
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from ._utils import UNSET
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from .exceptions import BadArgumentUsage
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from .exceptions import BadOptionUsage
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from .exceptions import NoSuchOption
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from .exceptions import UsageError
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if t.TYPE_CHECKING:
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from ._utils import T_FLAG_NEEDS_VALUE
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from ._utils import T_UNSET
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from .core import Argument as CoreArgument
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from .core import Context
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from .core import Option as CoreOption
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from .core import Parameter as CoreParameter
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V = t.TypeVar("V")
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def _unpack_args(
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args: cabc.Sequence[str], nargs_spec: cabc.Sequence[int]
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) -> tuple[cabc.Sequence[str | cabc.Sequence[str | None] | None], list[str]]:
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"""Given an iterable of arguments and an iterable of nargs specifications,
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it returns a tuple with all the unpacked arguments at the first index
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and all remaining arguments as the second.
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The nargs specification is the number of arguments that should be consumed
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or `-1` to indicate that this position should eat up all the remainders.
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Missing items are filled with ``UNSET``.
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"""
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args = deque(args)
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nargs_spec = deque(nargs_spec)
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rv: list[str | tuple[str | T_UNSET, ...] | T_UNSET] = []
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spos: int | None = None
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def _fetch(c: deque[V]) -> V | T_UNSET:
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try:
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if spos is None:
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return c.popleft()
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else:
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return c.pop()
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except IndexError:
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return UNSET
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while nargs_spec:
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nargs = _fetch(nargs_spec)
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if nargs is None:
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continue
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if nargs == 1:
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rv.append(_fetch(args)) # type: ignore[arg-type]
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elif nargs > 1:
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x = [_fetch(args) for _ in range(nargs)]
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# If we're reversed, we're pulling in the arguments in reverse,
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# so we need to turn them around.
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if spos is not None:
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x.reverse()
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rv.append(tuple(x))
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elif nargs < 0:
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if spos is not None:
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raise TypeError("Cannot have two nargs < 0")
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spos = len(rv)
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rv.append(UNSET)
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# spos is the position of the wildcard (star). If it's not `None`,
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# we fill it with the remainder.
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if spos is not None:
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rv[spos] = tuple(args)
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args = []
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rv[spos + 1 :] = reversed(rv[spos + 1 :])
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return tuple(rv), list(args)
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def _split_opt(opt: str) -> tuple[str, str]:
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first = opt[:1]
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if first.isalnum():
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return "", opt
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if opt[1:2] == first:
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return opt[:2], opt[2:]
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return first, opt[1:]
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def _normalize_opt(opt: str, ctx: Context | None) -> str:
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if ctx is None or ctx.token_normalize_func is None:
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return opt
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prefix, opt = _split_opt(opt)
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return f"{prefix}{ctx.token_normalize_func(opt)}"
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class _Option:
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def __init__(
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self,
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obj: CoreOption,
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opts: cabc.Sequence[str],
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dest: str | None,
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action: str | None = None,
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nargs: int = 1,
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const: t.Any | None = None,
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):
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self._short_opts = []
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self._long_opts = []
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self.prefixes: set[str] = set()
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for opt in opts:
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prefix, value = _split_opt(opt)
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if not prefix:
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raise ValueError(f"Invalid start character for option ({opt})")
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self.prefixes.add(prefix[0])
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if len(prefix) == 1 and len(value) == 1:
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self._short_opts.append(opt)
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else:
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self._long_opts.append(opt)
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self.prefixes.add(prefix)
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if action is None:
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action = "store"
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self.dest = dest
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self.action = action
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self.nargs = nargs
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self.const = const
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self.obj = obj
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@property
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def takes_value(self) -> bool:
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return self.action in ("store", "append")
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def process(self, value: t.Any, state: _ParsingState) -> None:
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if self.action == "store":
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state.opts[self.dest] = value # type: ignore
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elif self.action == "store_const":
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state.opts[self.dest] = self.const # type: ignore
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elif self.action == "append":
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state.opts.setdefault(self.dest, []).append(value) # type: ignore
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elif self.action == "append_const":
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state.opts.setdefault(self.dest, []).append(self.const) # type: ignore
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elif self.action == "count":
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state.opts[self.dest] = state.opts.get(self.dest, 0) + 1 # type: ignore
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else:
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raise ValueError(f"unknown action '{self.action}'")
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state.order.append(self.obj)
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class _Argument:
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def __init__(self, obj: CoreArgument, dest: str | None, nargs: int = 1):
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self.dest = dest
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self.nargs = nargs
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self.obj = obj
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def process(
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self,
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value: str | cabc.Sequence[str | None] | None | T_UNSET,
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state: _ParsingState,
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) -> None:
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if self.nargs > 1:
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assert isinstance(value, cabc.Sequence)
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holes = sum(1 for x in value if x is UNSET)
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if holes == len(value):
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value = UNSET
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elif holes != 0:
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raise BadArgumentUsage(
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_("Argument {name!r} takes {nargs} values.").format(
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name=self.dest, nargs=self.nargs
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)
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)
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# We failed to collect any argument value so we consider the argument as unset.
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if value == ():
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value = UNSET
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state.opts[self.dest] = value # type: ignore
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state.order.append(self.obj)
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class _ParsingState:
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def __init__(self, rargs: list[str]) -> None:
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self.opts: dict[str, t.Any] = {}
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self.largs: list[str] = []
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self.rargs = rargs
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self.order: list[CoreParameter] = []
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class _OptionParser:
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"""The option parser is an internal class that is ultimately used to
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parse options and arguments. It's modelled after optparse and brings
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a similar but vastly simplified API. It should generally not be used
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directly as the high level Click classes wrap it for you.
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It's not nearly as extensible as optparse or argparse as it does not
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implement features that are implemented on a higher level (such as
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types or defaults).
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:param ctx: optionally the :class:`~click.Context` where this parser
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should go with.
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.. deprecated:: 8.2
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Will be removed in Click 9.0.
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"""
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def __init__(self, ctx: Context | None = None) -> None:
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#: The :class:`~click.Context` for this parser. This might be
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#: `None` for some advanced use cases.
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self.ctx = ctx
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#: This controls how the parser deals with interspersed arguments.
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#: If this is set to `False`, the parser will stop on the first
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#: non-option. Click uses this to implement nested subcommands
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#: safely.
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self.allow_interspersed_args: bool = True
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#: This tells the parser how to deal with unknown options. By
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#: default it will error out (which is sensible), but there is a
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#: second mode where it will ignore it and continue processing
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#: after shifting all the unknown options into the resulting args.
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self.ignore_unknown_options: bool = False
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if ctx is not None:
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self.allow_interspersed_args = ctx.allow_interspersed_args
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self.ignore_unknown_options = ctx.ignore_unknown_options
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self._short_opt: dict[str, _Option] = {}
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self._long_opt: dict[str, _Option] = {}
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self._opt_prefixes = {"-", "--"}
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self._args: list[_Argument] = []
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def add_option(
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self,
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obj: CoreOption,
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opts: cabc.Sequence[str],
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dest: str | None,
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action: str | None = None,
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nargs: int = 1,
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const: t.Any | None = None,
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) -> None:
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"""Adds a new option named `dest` to the parser. The destination
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is not inferred (unlike with optparse) and needs to be explicitly
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provided. Action can be any of ``store``, ``store_const``,
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``append``, ``append_const`` or ``count``.
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The `obj` can be used to identify the option in the order list
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that is returned from the parser.
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"""
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opts = [_normalize_opt(opt, self.ctx) for opt in opts]
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option = _Option(obj, opts, dest, action=action, nargs=nargs, const=const)
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self._opt_prefixes.update(option.prefixes)
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for opt in option._short_opts:
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self._short_opt[opt] = option
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for opt in option._long_opts:
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self._long_opt[opt] = option
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def add_argument(self, obj: CoreArgument, dest: str | None, nargs: int = 1) -> None:
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"""Adds a positional argument named `dest` to the parser.
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The `obj` can be used to identify the option in the order list
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that is returned from the parser.
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"""
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self._args.append(_Argument(obj, dest=dest, nargs=nargs))
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def parse_args(
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self, args: list[str]
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) -> tuple[dict[str, t.Any], list[str], list[CoreParameter]]:
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"""Parses positional arguments and returns ``(values, args, order)``
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for the parsed options and arguments as well as the leftover
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arguments if there are any. The order is a list of objects as they
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appear on the command line. If arguments appear multiple times they
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will be memorized multiple times as well.
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"""
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state = _ParsingState(args)
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try:
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self._process_args_for_options(state)
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self._process_args_for_args(state)
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except UsageError:
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if self.ctx is None or not self.ctx.resilient_parsing:
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raise
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return state.opts, state.largs, state.order
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def _process_args_for_args(self, state: _ParsingState) -> None:
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pargs, args = _unpack_args(
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state.largs + state.rargs, [x.nargs for x in self._args]
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)
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for idx, arg in enumerate(self._args):
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arg.process(pargs[idx], state)
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state.largs = args
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state.rargs = []
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def _process_args_for_options(self, state: _ParsingState) -> None:
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while state.rargs:
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arg = state.rargs.pop(0)
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arglen = len(arg)
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# Double dashes always handled explicitly regardless of what
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# prefixes are valid.
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if arg == "--":
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return
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elif arg[:1] in self._opt_prefixes and arglen > 1:
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self._process_opts(arg, state)
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elif self.allow_interspersed_args:
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state.largs.append(arg)
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else:
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state.rargs.insert(0, arg)
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return
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# Say this is the original argument list:
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# [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)]
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# ^
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# (we are about to process arg(i)).
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#
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# Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of
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# [arg0, ..., arg(i-1)] (any options and their arguments will have
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# been removed from largs).
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#
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# The while loop will usually consume 1 or more arguments per pass.
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# If it consumes 1 (eg. arg is an option that takes no arguments),
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# then after _process_arg() is done the situation is:
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#
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# largs = subset of [arg0, ..., arg(i)]
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# rargs = [arg(i+1), ..., arg(N-1)]
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#
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# If allow_interspersed_args is false, largs will always be
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# *empty* -- still a subset of [arg0, ..., arg(i-1)], but
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# not a very interesting subset!
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def _match_long_opt(
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self, opt: str, explicit_value: str | None, state: _ParsingState
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) -> None:
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if opt not in self._long_opt:
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from difflib import get_close_matches
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possibilities = get_close_matches(opt, self._long_opt)
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raise NoSuchOption(opt, possibilities=possibilities, ctx=self.ctx)
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option = self._long_opt[opt]
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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 = UNSET
|
||
|
|
|
||
|
|
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 = UNSET
|
||
|
|
|
||
|
|
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
|
||
|
|
) -> str | cabc.Sequence[str] | T_FLAG_NEEDS_VALUE:
|
||
|
|
nargs = option.nargs
|
||
|
|
|
||
|
|
value: str | cabc.Sequence[str] | T_FLAG_NEEDS_VALUE
|
||
|
|
|
||
|
|
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)
|
||
|
|
|
||
|
|
|
||
|
|
def __getattr__(name: str) -> object:
|
||
|
|
import warnings
|
||
|
|
|
||
|
|
if name in {
|
||
|
|
"OptionParser",
|
||
|
|
"Argument",
|
||
|
|
"Option",
|
||
|
|
"split_opt",
|
||
|
|
"normalize_opt",
|
||
|
|
"ParsingState",
|
||
|
|
}:
|
||
|
|
warnings.warn(
|
||
|
|
f"'parser.{name}' is deprecated and will be removed in Click 9.0."
|
||
|
|
" The old parser is available in 'optparse'.",
|
||
|
|
DeprecationWarning,
|
||
|
|
stacklevel=2,
|
||
|
|
)
|
||
|
|
return globals()[f"_{name}"]
|
||
|
|
|
||
|
|
if name == "split_arg_string":
|
||
|
|
from .shell_completion import split_arg_string
|
||
|
|
|
||
|
|
warnings.warn(
|
||
|
|
"Importing 'parser.split_arg_string' is deprecated, it will only be"
|
||
|
|
" available in 'shell_completion' in Click 9.0.",
|
||
|
|
DeprecationWarning,
|
||
|
|
stacklevel=2,
|
||
|
|
)
|
||
|
|
return split_arg_string
|
||
|
|
|
||
|
|
raise AttributeError(name)
|