Edit File: argparsing.py
import argparse import os import sys import warnings from gettext import gettext from typing import Any from typing import Callable from typing import cast from typing import Dict from typing import List from typing import Mapping from typing import NoReturn from typing import Optional from typing import Sequence from typing import Tuple from typing import TYPE_CHECKING from typing import Union import _pytest._io from _pytest.compat import final from _pytest.config.exceptions import UsageError from _pytest.deprecated import ARGUMENT_PERCENT_DEFAULT from _pytest.deprecated import ARGUMENT_TYPE_STR from _pytest.deprecated import ARGUMENT_TYPE_STR_CHOICE from _pytest.deprecated import check_ispytest if TYPE_CHECKING: from typing_extensions import Literal FILE_OR_DIR = "file_or_dir" @final class Parser: """Parser for command line arguments and ini-file values. :ivar extra_info: Dict of generic param -> value to display in case there's an error processing the command line arguments. """ prog: Optional[str] = None def __init__( self, usage: Optional[str] = None, processopt: Optional[Callable[["Argument"], None]] = None, *, _ispytest: bool = False, ) -> None: check_ispytest(_ispytest) self._anonymous = OptionGroup("Custom options", parser=self, _ispytest=True) self._groups: List[OptionGroup] = [] self._processopt = processopt self._usage = usage self._inidict: Dict[str, Tuple[str, Optional[str], Any]] = {} self._ininames: List[str] = [] self.extra_info: Dict[str, Any] = {} def processoption(self, option: "Argument") -> None: if self._processopt: if option.dest: self._processopt(option) def getgroup( self, name: str, description: str = "", after: Optional[str] = None ) -> "OptionGroup": """Get (or create) a named option Group. :param name: Name of the option group. :param description: Long description for --help output. :param after: Name of another group, used for ordering --help output. :returns: The option group. The returned group object has an ``addoption`` method with the same signature as :func:`parser.addoption <pytest.Parser.addoption>` but will be shown in the respective group in the output of ``pytest --help``. """ for group in self._groups: if group.name == name: return group group = OptionGroup(name, description, parser=self, _ispytest=True) i = 0 for i, grp in enumerate(self._groups): if grp.name == after: break self._groups.insert(i + 1, group) return group def addoption(self, *opts: str, **attrs: Any) -> None: """Register a command line option. :param opts: Option names, can be short or long options. :param attrs: Same attributes as the argparse library's :py:func:`add_argument() <argparse.ArgumentParser.add_argument>` function accepts. After command line parsing, options are available on the pytest config object via ``config.option.NAME`` where ``NAME`` is usually set by passing a ``dest`` attribute, for example ``addoption("--long", dest="NAME", ...)``. """ self._anonymous.addoption(*opts, **attrs) def parse( self, args: Sequence[Union[str, "os.PathLike[str]"]], namespace: Optional[argparse.Namespace] = None, ) -> argparse.Namespace: from _pytest._argcomplete import try_argcomplete self.optparser = self._getparser() try_argcomplete(self.optparser) strargs = [os.fspath(x) for x in args] return self.optparser.parse_args(strargs, namespace=namespace) def _getparser(self) -> "MyOptionParser": from _pytest._argcomplete import filescompleter optparser = MyOptionParser(self, self.extra_info, prog=self.prog) groups = self._groups + [self._anonymous] for group in groups: if group.options: desc = group.description or group.name arggroup = optparser.add_argument_group(desc) for option in group.options: n = option.names() a = option.attrs() arggroup.add_argument(*n, **a) file_or_dir_arg = optparser.add_argument(FILE_OR_DIR, nargs="*") # bash like autocompletion for dirs (appending '/') # Type ignored because typeshed doesn't know about argcomplete. file_or_dir_arg.completer = filescompleter # type: ignore return optparser def parse_setoption( self, args: Sequence[Union[str, "os.PathLike[str]"]], option: argparse.Namespace, namespace: Optional[argparse.Namespace] = None, ) -> List[str]: parsedoption = self.parse(args, namespace=namespace) for name, value in parsedoption.__dict__.items(): setattr(option, name, value) return cast(List[str], getattr(parsedoption, FILE_OR_DIR)) def parse_known_args( self, args: Sequence[Union[str, "os.PathLike[str]"]], namespace: Optional[argparse.Namespace] = None, ) -> argparse.Namespace: """Parse the known arguments at this point. :returns: An argparse namespace object. """ return self.parse_known_and_unknown_args(args, namespace=namespace)[0] def parse_known_and_unknown_args( self, args: Sequence[Union[str, "os.PathLike[str]"]], namespace: Optional[argparse.Namespace] = None, ) -> Tuple[argparse.Namespace, List[str]]: """Parse the known arguments at this point, and also return the remaining unknown arguments. :returns: A tuple containing an argparse namespace object for the known arguments, and a list of the unknown arguments. """ optparser = self._getparser() strargs = [os.fspath(x) for x in args] return optparser.parse_known_args(strargs, namespace=namespace) def addini( self, name: str, help: str, type: Optional[ "Literal['string', 'paths', 'pathlist', 'args', 'linelist', 'bool']" ] = None, default: Any = None, ) -> None: """Register an ini-file option. :param name: Name of the ini-variable. :param type: Type of the variable. Can be: * ``string``: a string * ``bool``: a boolean * ``args``: a list of strings, separated as in a shell * ``linelist``: a list of strings, separated by line breaks * ``paths``: a list of :class:`pathlib.Path`, separated as in a shell * ``pathlist``: a list of ``py.path``, separated as in a shell .. versionadded:: 7.0 The ``paths`` variable type. Defaults to ``string`` if ``None`` or not passed. :param default: Default value if no ini-file option exists but is queried. The value of ini-variables can be retrieved via a call to :py:func:`config.getini(name) <pytest.Config.getini>`. """ assert type in (None, "string", "paths", "pathlist", "args", "linelist", "bool") self._inidict[name] = (help, type, default) self._ininames.append(name) class ArgumentError(Exception): """Raised if an Argument instance is created with invalid or inconsistent arguments.""" def __init__(self, msg: str, option: Union["Argument", str]) -> None: self.msg = msg self.option_id = str(option) def __str__(self) -> str: if self.option_id: return f"option {self.option_id}: {self.msg}" else: return self.msg class Argument: """Class that mimics the necessary behaviour of optparse.Option. It's currently a least effort implementation and ignoring choices and integer prefixes. https://docs.python.org/3/library/optparse.html#optparse-standard-option-types """ _typ_map = {"int": int, "string": str, "float": float, "complex": complex} def __init__(self, *names: str, **attrs: Any) -> None: """Store params in private vars for use in add_argument.""" self._attrs = attrs self._short_opts: List[str] = [] self._long_opts: List[str] = [] if "%default" in (attrs.get("help") or ""): warnings.warn(ARGUMENT_PERCENT_DEFAULT, stacklevel=3) try: typ = attrs["type"] except KeyError: pass else: # This might raise a keyerror as well, don't want to catch that. if isinstance(typ, str): if typ == "choice": warnings.warn( ARGUMENT_TYPE_STR_CHOICE.format(typ=typ, names=names), stacklevel=4, ) # argparse expects a type here take it from # the type of the first element attrs["type"] = type(attrs["choices"][0]) else: warnings.warn( ARGUMENT_TYPE_STR.format(typ=typ, names=names), stacklevel=4 ) attrs["type"] = Argument._typ_map[typ] # Used in test_parseopt -> test_parse_defaultgetter. self.type = attrs["type"] else: self.type = typ try: # Attribute existence is tested in Config._processopt. self.default = attrs["default"] except KeyError: pass self._set_opt_strings(names) dest: Optional[str] = attrs.get("dest") if dest: self.dest = dest elif self._long_opts: self.dest = self._long_opts[0][2:].replace("-", "_") else: try: self.dest = self._short_opts[0][1:] except IndexError as e: self.dest = "???" # Needed for the error repr. raise ArgumentError("need a long or short option", self) from e def names(self) -> List[str]: return self._short_opts + self._long_opts def attrs(self) -> Mapping[str, Any]: # Update any attributes set by processopt. attrs = "default dest help".split() attrs.append(self.dest) for attr in attrs: try: self._attrs[attr] = getattr(self, attr) except AttributeError: pass if self._attrs.get("help"): a = self._attrs["help"] a = a.replace("%default", "%(default)s") # a = a.replace('%prog', '%(prog)s') self._attrs["help"] = a return self._attrs def _set_opt_strings(self, opts: Sequence[str]) -> None: """Directly from optparse. Might not be necessary as this is passed to argparse later on. """ for opt in opts: if len(opt) < 2: raise ArgumentError( "invalid option string %r: " "must be at least two characters long" % opt, self, ) elif len(opt) == 2: if not (opt[0] == "-" and opt[1] != "-"): raise ArgumentError( "invalid short option string %r: " "must be of the form -x, (x any non-dash char)" % opt, self, ) self._short_opts.append(opt) else: if not (opt[0:2] == "--" and opt[2] != "-"): raise ArgumentError( "invalid long option string %r: " "must start with --, followed by non-dash" % opt, self, ) self._long_opts.append(opt) def __repr__(self) -> str: args: List[str] = [] if self._short_opts: args += ["_short_opts: " + repr(self._short_opts)] if self._long_opts: args += ["_long_opts: " + repr(self._long_opts)] args += ["dest: " + repr(self.dest)] if hasattr(self, "type"): args += ["type: " + repr(self.type)] if hasattr(self, "default"): args += ["default: " + repr(self.default)] return "Argument({})".format(", ".join(args)) class OptionGroup: """A group of options shown in its own section.""" def __init__( self, name: str, description: str = "", parser: Optional[Parser] = None, *, _ispytest: bool = False, ) -> None: check_ispytest(_ispytest) self.name = name self.description = description self.options: List[Argument] = [] self.parser = parser def addoption(self, *opts: str, **attrs: Any) -> None: """Add an option to this group. If a shortened version of a long option is specified, it will be suppressed in the help. ``addoption('--twowords', '--two-words')`` results in help showing ``--two-words`` only, but ``--twowords`` gets accepted **and** the automatic destination is in ``args.twowords``. :param opts: Option names, can be short or long options. :param attrs: Same attributes as the argparse library's :py:func:`add_argument() <argparse.ArgumentParser.add_argument>` function accepts. """ conflict = set(opts).intersection( name for opt in self.options for name in opt.names() ) if conflict: raise ValueError("option names %s already added" % conflict) option = Argument(*opts, **attrs) self._addoption_instance(option, shortupper=False) def _addoption(self, *opts: str, **attrs: Any) -> None: option = Argument(*opts, **attrs) self._addoption_instance(option, shortupper=True) def _addoption_instance(self, option: "Argument", shortupper: bool = False) -> None: if not shortupper: for opt in option._short_opts: if opt[0] == "-" and opt[1].islower(): raise ValueError("lowercase shortoptions reserved") if self.parser: self.parser.processoption(option) self.options.append(option) class MyOptionParser(argparse.ArgumentParser): def __init__( self, parser: Parser, extra_info: Optional[Dict[str, Any]] = None, prog: Optional[str] = None, ) -> None: self._parser = parser super().__init__( prog=prog, usage=parser._usage, add_help=False, formatter_class=DropShorterLongHelpFormatter, allow_abbrev=False, ) # extra_info is a dict of (param -> value) to display if there's # an usage error to provide more contextual information to the user. self.extra_info = extra_info if extra_info else {} def error(self, message: str) -> NoReturn: """Transform argparse error message into UsageError.""" msg = f"{self.prog}: error: {message}" if hasattr(self._parser, "_config_source_hint"): # Type ignored because the attribute is set dynamically. msg = f"{msg} ({self._parser._config_source_hint})" # type: ignore raise UsageError(self.format_usage() + msg) # Type ignored because typeshed has a very complex type in the superclass. def parse_args( # type: ignore self, args: Optional[Sequence[str]] = None, namespace: Optional[argparse.Namespace] = None, ) -> argparse.Namespace: """Allow splitting of positional arguments.""" parsed, unrecognized = self.parse_known_args(args, namespace) if unrecognized: for arg in unrecognized: if arg and arg[0] == "-": lines = ["unrecognized arguments: %s" % (" ".join(unrecognized))] for k, v in sorted(self.extra_info.items()): lines.append(f" {k}: {v}") self.error("\n".join(lines)) getattr(parsed, FILE_OR_DIR).extend(unrecognized) return parsed if sys.version_info[:2] < (3, 9): # pragma: no cover # Backport of https://github.com/python/cpython/pull/14316 so we can # disable long --argument abbreviations without breaking short flags. def _parse_optional( self, arg_string: str ) -> Optional[Tuple[Optional[argparse.Action], str, Optional[str]]]: if not arg_string: return None if not arg_string[0] in self.prefix_chars: return None if arg_string in self._option_string_actions: action = self._option_string_actions[arg_string] return action, arg_string, None if len(arg_string) == 1: return None if "=" in arg_string: option_string, explicit_arg = arg_string.split("=", 1) if option_string in self._option_string_actions: action = self._option_string_actions[option_string] return action, option_string, explicit_arg if self.allow_abbrev or not arg_string.startswith("--"): option_tuples = self._get_option_tuples(arg_string) if len(option_tuples) > 1: msg = gettext( "ambiguous option: %(option)s could match %(matches)s" ) options = ", ".join(option for _, option, _ in option_tuples) self.error(msg % {"option": arg_string, "matches": options}) elif len(option_tuples) == 1: (option_tuple,) = option_tuples return option_tuple if self._negative_number_matcher.match(arg_string): if not self._has_negative_number_optionals: return None if " " in arg_string: return None return None, arg_string, None class DropShorterLongHelpFormatter(argparse.HelpFormatter): """Shorten help for long options that differ only in extra hyphens. - Collapse **long** options that are the same except for extra hyphens. - Shortcut if there are only two options and one of them is a short one. - Cache result on the action object as this is called at least 2 times. """ def __init__(self, *args: Any, **kwargs: Any) -> None: # Use more accurate terminal width. if "width" not in kwargs: kwargs["width"] = _pytest._io.get_terminal_width() super().__init__(*args, **kwargs) def _format_action_invocation(self, action: argparse.Action) -> str: orgstr = super()._format_action_invocation(action) if orgstr and orgstr[0] != "-": # only optional arguments return orgstr res: Optional[str] = getattr(action, "_formatted_action_invocation", None) if res: return res options = orgstr.split(", ") if len(options) == 2 and (len(options[0]) == 2 or len(options[1]) == 2): # a shortcut for '-h, --help' or '--abc', '-a' action._formatted_action_invocation = orgstr # type: ignore return orgstr return_list = [] short_long: Dict[str, str] = {} for option in options: if len(option) == 2 or option[2] == " ": continue if not option.startswith("--"): raise ArgumentError( 'long optional argument without "--": [%s]' % (option), option ) xxoption = option[2:] shortened = xxoption.replace("-", "") if shortened not in short_long or len(short_long[shortened]) < len( xxoption ): short_long[shortened] = xxoption # now short_long has been filled out to the longest with dashes # **and** we keep the right option ordering from add_argument for option in options: if len(option) == 2 or option[2] == " ": return_list.append(option) if option[2:] == short_long.get(option.replace("-", "")): return_list.append(option.replace(" ", "=", 1)) formatted_action_invocation = ", ".join(return_list) action._formatted_action_invocation = formatted_action_invocation # type: ignore return formatted_action_invocation def _split_lines(self, text, width): """Wrap lines after splitting on original newlines. This allows to have explicit line breaks in the help text. """ import textwrap lines = [] for line in text.splitlines(): lines.extend(textwrap.wrap(line.strip(), width)) return lines