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0cb4d6c654
The usage parameter of argparse.ArgumentParser no longer affects the default value of the prog parameter in subparsers. Previously the full custom usage of the main parser was used as the prog prefix in subparsers.
2694 lines
101 KiB
Python
2694 lines
101 KiB
Python
# Author: Steven J. Bethard <steven.bethard@gmail.com>.
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# New maintainer as of 29 August 2019: Raymond Hettinger <raymond.hettinger@gmail.com>
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"""Command-line parsing library
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This module is an optparse-inspired command-line parsing library that:
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- handles both optional and positional arguments
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- produces highly informative usage messages
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- supports parsers that dispatch to sub-parsers
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The following is a simple usage example that sums integers from the
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command-line and writes the result to a file::
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parser = argparse.ArgumentParser(
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description='sum the integers at the command line')
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parser.add_argument(
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'integers', metavar='int', nargs='+', type=int,
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help='an integer to be summed')
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parser.add_argument(
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'--log',
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help='the file where the sum should be written')
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args = parser.parse_args()
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with (open(args.log, 'w') if args.log is not None
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else contextlib.nullcontext(sys.stdout)) as log:
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log.write('%s' % sum(args.integers))
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The module contains the following public classes:
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- ArgumentParser -- The main entry point for command-line parsing. As the
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example above shows, the add_argument() method is used to populate
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the parser with actions for optional and positional arguments. Then
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the parse_args() method is invoked to convert the args at the
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command-line into an object with attributes.
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- ArgumentError -- The exception raised by ArgumentParser objects when
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there are errors with the parser's actions. Errors raised while
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parsing the command-line are caught by ArgumentParser and emitted
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as command-line messages.
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- FileType -- A factory for defining types of files to be created. As the
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example above shows, instances of FileType are typically passed as
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the type= argument of add_argument() calls. Deprecated since
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Python 3.14.
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- Action -- The base class for parser actions. Typically actions are
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selected by passing strings like 'store_true' or 'append_const' to
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the action= argument of add_argument(). However, for greater
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customization of ArgumentParser actions, subclasses of Action may
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be defined and passed as the action= argument.
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- HelpFormatter, RawDescriptionHelpFormatter, RawTextHelpFormatter,
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ArgumentDefaultsHelpFormatter -- Formatter classes which
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may be passed as the formatter_class= argument to the
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ArgumentParser constructor. HelpFormatter is the default,
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RawDescriptionHelpFormatter and RawTextHelpFormatter tell the parser
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not to change the formatting for help text, and
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ArgumentDefaultsHelpFormatter adds information about argument defaults
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to the help.
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All other classes in this module are considered implementation details.
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(Also note that HelpFormatter and RawDescriptionHelpFormatter are only
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considered public as object names -- the API of the formatter objects is
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still considered an implementation detail.)
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"""
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__version__ = '1.1'
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__all__ = [
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'ArgumentParser',
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'ArgumentError',
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'ArgumentTypeError',
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'BooleanOptionalAction',
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'FileType',
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'HelpFormatter',
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'ArgumentDefaultsHelpFormatter',
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'RawDescriptionHelpFormatter',
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'RawTextHelpFormatter',
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'MetavarTypeHelpFormatter',
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'Namespace',
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'Action',
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'ONE_OR_MORE',
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'OPTIONAL',
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'PARSER',
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'REMAINDER',
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'SUPPRESS',
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'ZERO_OR_MORE',
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]
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import os as _os
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import re as _re
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import sys as _sys
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from gettext import gettext as _, ngettext
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SUPPRESS = '==SUPPRESS=='
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OPTIONAL = '?'
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ZERO_OR_MORE = '*'
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ONE_OR_MORE = '+'
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PARSER = 'A...'
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REMAINDER = '...'
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_UNRECOGNIZED_ARGS_ATTR = '_unrecognized_args'
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# =============================
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# Utility functions and classes
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# =============================
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class _AttributeHolder(object):
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"""Abstract base class that provides __repr__.
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The __repr__ method returns a string in the format::
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ClassName(attr=name, attr=name, ...)
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The attributes are determined either by a class-level attribute,
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'_kwarg_names', or by inspecting the instance __dict__.
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"""
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def __repr__(self):
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type_name = type(self).__name__
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arg_strings = []
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star_args = {}
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for arg in self._get_args():
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arg_strings.append(repr(arg))
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for name, value in self._get_kwargs():
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if name.isidentifier():
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arg_strings.append('%s=%r' % (name, value))
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else:
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star_args[name] = value
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if star_args:
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arg_strings.append('**%s' % repr(star_args))
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return '%s(%s)' % (type_name, ', '.join(arg_strings))
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def _get_kwargs(self):
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return list(self.__dict__.items())
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def _get_args(self):
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return []
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def _copy_items(items):
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if items is None:
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return []
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# The copy module is used only in the 'append' and 'append_const'
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# actions, and it is needed only when the default value isn't a list.
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# Delay its import for speeding up the common case.
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if type(items) is list:
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return items[:]
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import copy
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return copy.copy(items)
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# ===============
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# Formatting Help
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# ===============
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class HelpFormatter(object):
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"""Formatter for generating usage messages and argument help strings.
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Only the name of this class is considered a public API. All the methods
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provided by the class are considered an implementation detail.
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"""
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def __init__(self,
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prog,
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indent_increment=2,
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max_help_position=24,
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width=None):
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# default setting for width
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if width is None:
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import shutil
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width = shutil.get_terminal_size().columns
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width -= 2
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self._prog = prog
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self._indent_increment = indent_increment
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self._max_help_position = min(max_help_position,
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max(width - 20, indent_increment * 2))
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self._width = width
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self._current_indent = 0
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self._level = 0
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self._action_max_length = 0
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self._root_section = self._Section(self, None)
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self._current_section = self._root_section
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self._whitespace_matcher = _re.compile(r'\s+', _re.ASCII)
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self._long_break_matcher = _re.compile(r'\n\n\n+')
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# ===============================
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# Section and indentation methods
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# ===============================
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def _indent(self):
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self._current_indent += self._indent_increment
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self._level += 1
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def _dedent(self):
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self._current_indent -= self._indent_increment
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assert self._current_indent >= 0, 'Indent decreased below 0.'
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self._level -= 1
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class _Section(object):
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def __init__(self, formatter, parent, heading=None):
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self.formatter = formatter
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self.parent = parent
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self.heading = heading
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self.items = []
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def format_help(self):
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# format the indented section
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if self.parent is not None:
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self.formatter._indent()
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join = self.formatter._join_parts
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item_help = join([func(*args) for func, args in self.items])
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if self.parent is not None:
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self.formatter._dedent()
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# return nothing if the section was empty
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if not item_help:
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return ''
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# add the heading if the section was non-empty
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if self.heading is not SUPPRESS and self.heading is not None:
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current_indent = self.formatter._current_indent
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heading_text = _('%(heading)s:') % dict(heading=self.heading)
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heading = '%*s%s\n' % (current_indent, '', heading_text)
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else:
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heading = ''
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# join the section-initial newline, the heading and the help
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return join(['\n', heading, item_help, '\n'])
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def _add_item(self, func, args):
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self._current_section.items.append((func, args))
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# ========================
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# Message building methods
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# ========================
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def start_section(self, heading):
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self._indent()
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section = self._Section(self, self._current_section, heading)
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self._add_item(section.format_help, [])
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self._current_section = section
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def end_section(self):
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self._current_section = self._current_section.parent
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self._dedent()
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def add_text(self, text):
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if text is not SUPPRESS and text is not None:
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self._add_item(self._format_text, [text])
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def add_usage(self, usage, actions, groups, prefix=None):
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if usage is not SUPPRESS:
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args = usage, actions, groups, prefix
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self._add_item(self._format_usage, args)
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def add_argument(self, action):
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if action.help is not SUPPRESS:
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# find all invocations
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get_invocation = self._format_action_invocation
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invocation_lengths = [len(get_invocation(action)) + self._current_indent]
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for subaction in self._iter_indented_subactions(action):
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invocation_lengths.append(len(get_invocation(subaction)) + self._current_indent)
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# update the maximum item length
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action_length = max(invocation_lengths)
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self._action_max_length = max(self._action_max_length,
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action_length)
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# add the item to the list
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self._add_item(self._format_action, [action])
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def add_arguments(self, actions):
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for action in actions:
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self.add_argument(action)
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# =======================
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# Help-formatting methods
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# =======================
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def format_help(self):
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help = self._root_section.format_help()
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if help:
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help = self._long_break_matcher.sub('\n\n', help)
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help = help.strip('\n') + '\n'
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return help
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def _join_parts(self, part_strings):
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return ''.join([part
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for part in part_strings
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if part and part is not SUPPRESS])
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def _format_usage(self, usage, actions, groups, prefix):
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if prefix is None:
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prefix = _('usage: ')
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# if usage is specified, use that
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if usage is not None:
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usage = usage % dict(prog=self._prog)
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# if no optionals or positionals are available, usage is just prog
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elif usage is None and not actions:
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usage = '%(prog)s' % dict(prog=self._prog)
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# if optionals and positionals are available, calculate usage
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elif usage is None:
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prog = '%(prog)s' % dict(prog=self._prog)
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# split optionals from positionals
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optionals = []
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positionals = []
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for action in actions:
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if action.option_strings:
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optionals.append(action)
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else:
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positionals.append(action)
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# build full usage string
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format = self._format_actions_usage
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action_usage = format(optionals + positionals, groups)
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usage = ' '.join([s for s in [prog, action_usage] if s])
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# wrap the usage parts if it's too long
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text_width = self._width - self._current_indent
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if len(prefix) + len(usage) > text_width:
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# break usage into wrappable parts
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opt_parts = self._get_actions_usage_parts(optionals, groups)
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pos_parts = self._get_actions_usage_parts(positionals, groups)
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# helper for wrapping lines
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def get_lines(parts, indent, prefix=None):
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lines = []
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line = []
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indent_length = len(indent)
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if prefix is not None:
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line_len = len(prefix) - 1
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else:
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line_len = indent_length - 1
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for part in parts:
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if line_len + 1 + len(part) > text_width and line:
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lines.append(indent + ' '.join(line))
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line = []
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line_len = indent_length - 1
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line.append(part)
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line_len += len(part) + 1
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if line:
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lines.append(indent + ' '.join(line))
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if prefix is not None:
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lines[0] = lines[0][indent_length:]
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return lines
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# if prog is short, follow it with optionals or positionals
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if len(prefix) + len(prog) <= 0.75 * text_width:
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indent = ' ' * (len(prefix) + len(prog) + 1)
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if opt_parts:
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lines = get_lines([prog] + opt_parts, indent, prefix)
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lines.extend(get_lines(pos_parts, indent))
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elif pos_parts:
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lines = get_lines([prog] + pos_parts, indent, prefix)
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else:
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lines = [prog]
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# if prog is long, put it on its own line
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else:
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indent = ' ' * len(prefix)
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parts = opt_parts + pos_parts
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lines = get_lines(parts, indent)
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if len(lines) > 1:
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lines = []
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lines.extend(get_lines(opt_parts, indent))
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lines.extend(get_lines(pos_parts, indent))
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lines = [prog] + lines
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# join lines into usage
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usage = '\n'.join(lines)
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# prefix with 'usage:'
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return '%s%s\n\n' % (prefix, usage)
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def _format_actions_usage(self, actions, groups):
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return ' '.join(self._get_actions_usage_parts(actions, groups))
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def _get_actions_usage_parts(self, actions, groups):
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# find group indices and identify actions in groups
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group_actions = set()
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inserts = {}
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for group in groups:
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if not group._group_actions:
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raise ValueError(f'empty group {group}')
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if all(action.help is SUPPRESS for action in group._group_actions):
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continue
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try:
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start = min(actions.index(item) for item in group._group_actions)
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except ValueError:
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continue
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else:
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end = start + len(group._group_actions)
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if set(actions[start:end]) == set(group._group_actions):
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group_actions.update(group._group_actions)
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inserts[start, end] = group
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# collect all actions format strings
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parts = []
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for action in actions:
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# suppressed arguments are marked with None
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if action.help is SUPPRESS:
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part = None
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# produce all arg strings
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elif not action.option_strings:
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default = self._get_default_metavar_for_positional(action)
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part = self._format_args(action, default)
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# if it's in a group, strip the outer []
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if action in group_actions:
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if part[0] == '[' and part[-1] == ']':
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part = part[1:-1]
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# produce the first way to invoke the option in brackets
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else:
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option_string = action.option_strings[0]
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# if the Optional doesn't take a value, format is:
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# -s or --long
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if action.nargs == 0:
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part = action.format_usage()
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# if the Optional takes a value, format is:
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# -s ARGS or --long ARGS
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else:
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default = self._get_default_metavar_for_optional(action)
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args_string = self._format_args(action, default)
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part = '%s %s' % (option_string, args_string)
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# make it look optional if it's not required or in a group
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if not action.required and action not in group_actions:
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part = '[%s]' % part
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# add the action string to the list
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parts.append(part)
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# group mutually exclusive actions
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inserted_separators_indices = set()
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for start, end in sorted(inserts, reverse=True):
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group = inserts[start, end]
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group_parts = [item for item in parts[start:end] if item is not None]
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group_size = len(group_parts)
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if group.required:
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open, close = "()" if group_size > 1 else ("", "")
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else:
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open, close = "[]"
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group_parts[0] = open + group_parts[0]
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group_parts[-1] = group_parts[-1] + close
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for i, part in enumerate(group_parts[:-1], start=start):
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# insert a separator if not already done in a nested group
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if i not in inserted_separators_indices:
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parts[i] = part + ' |'
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inserted_separators_indices.add(i)
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parts[start + group_size - 1] = group_parts[-1]
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for i in range(start + group_size, end):
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parts[i] = None
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# return the usage parts
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return [item for item in parts if item is not None]
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def _format_text(self, text):
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if '%(prog)' in text:
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text = text % dict(prog=self._prog)
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text_width = max(self._width - self._current_indent, 11)
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indent = ' ' * self._current_indent
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return self._fill_text(text, text_width, indent) + '\n\n'
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def _format_action(self, action):
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# determine the required width and the entry label
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help_position = min(self._action_max_length + 2,
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self._max_help_position)
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help_width = max(self._width - help_position, 11)
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action_width = help_position - self._current_indent - 2
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action_header = self._format_action_invocation(action)
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# no help; start on same line and add a final newline
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if not action.help:
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tup = self._current_indent, '', action_header
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action_header = '%*s%s\n' % tup
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# short action name; start on the same line and pad two spaces
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elif len(action_header) <= action_width:
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tup = self._current_indent, '', action_width, action_header
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action_header = '%*s%-*s ' % tup
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indent_first = 0
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# long action name; start on the next line
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else:
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tup = self._current_indent, '', action_header
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action_header = '%*s%s\n' % tup
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indent_first = help_position
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# collect the pieces of the action help
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parts = [action_header]
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# if there was help for the action, add lines of help text
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if action.help and action.help.strip():
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help_text = self._expand_help(action)
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if help_text:
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help_lines = self._split_lines(help_text, help_width)
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parts.append('%*s%s\n' % (indent_first, '', help_lines[0]))
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for line in help_lines[1:]:
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parts.append('%*s%s\n' % (help_position, '', line))
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# or add a newline if the description doesn't end with one
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elif not action_header.endswith('\n'):
|
|
parts.append('\n')
|
|
|
|
# if there are any sub-actions, add their help as well
|
|
for subaction in self._iter_indented_subactions(action):
|
|
parts.append(self._format_action(subaction))
|
|
|
|
# return a single string
|
|
return self._join_parts(parts)
|
|
|
|
def _format_action_invocation(self, action):
|
|
if not action.option_strings:
|
|
default = self._get_default_metavar_for_positional(action)
|
|
return ' '.join(self._metavar_formatter(action, default)(1))
|
|
|
|
else:
|
|
|
|
# if the Optional doesn't take a value, format is:
|
|
# -s, --long
|
|
if action.nargs == 0:
|
|
return ', '.join(action.option_strings)
|
|
|
|
# if the Optional takes a value, format is:
|
|
# -s, --long ARGS
|
|
else:
|
|
default = self._get_default_metavar_for_optional(action)
|
|
args_string = self._format_args(action, default)
|
|
return ', '.join(action.option_strings) + ' ' + args_string
|
|
|
|
def _metavar_formatter(self, action, default_metavar):
|
|
if action.metavar is not None:
|
|
result = action.metavar
|
|
elif action.choices is not None:
|
|
result = '{%s}' % ','.join(map(str, action.choices))
|
|
else:
|
|
result = default_metavar
|
|
|
|
def format(tuple_size):
|
|
if isinstance(result, tuple):
|
|
return result
|
|
else:
|
|
return (result, ) * tuple_size
|
|
return format
|
|
|
|
def _format_args(self, action, default_metavar):
|
|
get_metavar = self._metavar_formatter(action, default_metavar)
|
|
if action.nargs is None:
|
|
result = '%s' % get_metavar(1)
|
|
elif action.nargs == OPTIONAL:
|
|
result = '[%s]' % get_metavar(1)
|
|
elif action.nargs == ZERO_OR_MORE:
|
|
metavar = get_metavar(1)
|
|
if len(metavar) == 2:
|
|
result = '[%s [%s ...]]' % metavar
|
|
else:
|
|
result = '[%s ...]' % metavar
|
|
elif action.nargs == ONE_OR_MORE:
|
|
result = '%s [%s ...]' % get_metavar(2)
|
|
elif action.nargs == REMAINDER:
|
|
result = '...'
|
|
elif action.nargs == PARSER:
|
|
result = '%s ...' % get_metavar(1)
|
|
elif action.nargs == SUPPRESS:
|
|
result = ''
|
|
else:
|
|
try:
|
|
formats = ['%s' for _ in range(action.nargs)]
|
|
except TypeError:
|
|
raise ValueError("invalid nargs value") from None
|
|
result = ' '.join(formats) % get_metavar(action.nargs)
|
|
return result
|
|
|
|
def _expand_help(self, action):
|
|
help_string = self._get_help_string(action)
|
|
if '%' not in help_string:
|
|
return help_string
|
|
params = dict(vars(action), prog=self._prog)
|
|
for name in list(params):
|
|
value = params[name]
|
|
if value is SUPPRESS:
|
|
del params[name]
|
|
elif hasattr(value, '__name__'):
|
|
params[name] = value.__name__
|
|
if params.get('choices') is not None:
|
|
params['choices'] = ', '.join(map(str, params['choices']))
|
|
return help_string % params
|
|
|
|
def _iter_indented_subactions(self, action):
|
|
try:
|
|
get_subactions = action._get_subactions
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
self._indent()
|
|
yield from get_subactions()
|
|
self._dedent()
|
|
|
|
def _split_lines(self, text, width):
|
|
text = self._whitespace_matcher.sub(' ', text).strip()
|
|
# The textwrap module is used only for formatting help.
|
|
# Delay its import for speeding up the common usage of argparse.
|
|
import textwrap
|
|
return textwrap.wrap(text, width)
|
|
|
|
def _fill_text(self, text, width, indent):
|
|
text = self._whitespace_matcher.sub(' ', text).strip()
|
|
import textwrap
|
|
return textwrap.fill(text, width,
|
|
initial_indent=indent,
|
|
subsequent_indent=indent)
|
|
|
|
def _get_help_string(self, action):
|
|
return action.help
|
|
|
|
def _get_default_metavar_for_optional(self, action):
|
|
return action.dest.upper()
|
|
|
|
def _get_default_metavar_for_positional(self, action):
|
|
return action.dest
|
|
|
|
|
|
class RawDescriptionHelpFormatter(HelpFormatter):
|
|
"""Help message formatter which retains any formatting in descriptions.
|
|
|
|
Only the name of this class is considered a public API. All the methods
|
|
provided by the class are considered an implementation detail.
|
|
"""
|
|
|
|
def _fill_text(self, text, width, indent):
|
|
return ''.join(indent + line for line in text.splitlines(keepends=True))
|
|
|
|
|
|
class RawTextHelpFormatter(RawDescriptionHelpFormatter):
|
|
"""Help message formatter which retains formatting of all help text.
|
|
|
|
Only the name of this class is considered a public API. All the methods
|
|
provided by the class are considered an implementation detail.
|
|
"""
|
|
|
|
def _split_lines(self, text, width):
|
|
return text.splitlines()
|
|
|
|
|
|
class ArgumentDefaultsHelpFormatter(HelpFormatter):
|
|
"""Help message formatter which adds default values to argument help.
|
|
|
|
Only the name of this class is considered a public API. All the methods
|
|
provided by the class are considered an implementation detail.
|
|
"""
|
|
|
|
def _get_help_string(self, action):
|
|
help = action.help
|
|
if help is None:
|
|
help = ''
|
|
|
|
if '%(default)' not in help:
|
|
if action.default is not SUPPRESS:
|
|
defaulting_nargs = [OPTIONAL, ZERO_OR_MORE]
|
|
if action.option_strings or action.nargs in defaulting_nargs:
|
|
help += _(' (default: %(default)s)')
|
|
return help
|
|
|
|
|
|
|
|
class MetavarTypeHelpFormatter(HelpFormatter):
|
|
"""Help message formatter which uses the argument 'type' as the default
|
|
metavar value (instead of the argument 'dest')
|
|
|
|
Only the name of this class is considered a public API. All the methods
|
|
provided by the class are considered an implementation detail.
|
|
"""
|
|
|
|
def _get_default_metavar_for_optional(self, action):
|
|
return action.type.__name__
|
|
|
|
def _get_default_metavar_for_positional(self, action):
|
|
return action.type.__name__
|
|
|
|
|
|
# =====================
|
|
# Options and Arguments
|
|
# =====================
|
|
|
|
def _get_action_name(argument):
|
|
if argument is None:
|
|
return None
|
|
elif argument.option_strings:
|
|
return '/'.join(argument.option_strings)
|
|
elif argument.metavar not in (None, SUPPRESS):
|
|
metavar = argument.metavar
|
|
if not isinstance(metavar, tuple):
|
|
return metavar
|
|
if argument.nargs == ZERO_OR_MORE and len(metavar) == 2:
|
|
return '%s[, %s]' % metavar
|
|
elif argument.nargs == ONE_OR_MORE:
|
|
return '%s[, %s]' % metavar
|
|
else:
|
|
return ', '.join(metavar)
|
|
elif argument.dest not in (None, SUPPRESS):
|
|
return argument.dest
|
|
elif argument.choices:
|
|
return '{%s}' % ','.join(map(str, argument.choices))
|
|
else:
|
|
return None
|
|
|
|
|
|
class ArgumentError(Exception):
|
|
"""An error from creating or using an argument (optional or positional).
|
|
|
|
The string value of this exception is the message, augmented with
|
|
information about the argument that caused it.
|
|
"""
|
|
|
|
def __init__(self, argument, message):
|
|
self.argument_name = _get_action_name(argument)
|
|
self.message = message
|
|
|
|
def __str__(self):
|
|
if self.argument_name is None:
|
|
format = '%(message)s'
|
|
else:
|
|
format = _('argument %(argument_name)s: %(message)s')
|
|
return format % dict(message=self.message,
|
|
argument_name=self.argument_name)
|
|
|
|
|
|
class ArgumentTypeError(Exception):
|
|
"""An error from trying to convert a command line string to a type."""
|
|
pass
|
|
|
|
|
|
# ==============
|
|
# Action classes
|
|
# ==============
|
|
|
|
class Action(_AttributeHolder):
|
|
"""Information about how to convert command line strings to Python objects.
|
|
|
|
Action objects are used by an ArgumentParser to represent the information
|
|
needed to parse a single argument from one or more strings from the
|
|
command line. The keyword arguments to the Action constructor are also
|
|
all attributes of Action instances.
|
|
|
|
Keyword Arguments:
|
|
|
|
- option_strings -- A list of command-line option strings which
|
|
should be associated with this action.
|
|
|
|
- dest -- The name of the attribute to hold the created object(s)
|
|
|
|
- nargs -- The number of command-line arguments that should be
|
|
consumed. By default, one argument will be consumed and a single
|
|
value will be produced. Other values include:
|
|
- N (an integer) consumes N arguments (and produces a list)
|
|
- '?' consumes zero or one arguments
|
|
- '*' consumes zero or more arguments (and produces a list)
|
|
- '+' consumes one or more arguments (and produces a list)
|
|
Note that the difference between the default and nargs=1 is that
|
|
with the default, a single value will be produced, while with
|
|
nargs=1, a list containing a single value will be produced.
|
|
|
|
- const -- The value to be produced if the option is specified and the
|
|
option uses an action that takes no values.
|
|
|
|
- default -- The value to be produced if the option is not specified.
|
|
|
|
- type -- A callable that accepts a single string argument, and
|
|
returns the converted value. The standard Python types str, int,
|
|
float, and complex are useful examples of such callables. If None,
|
|
str is used.
|
|
|
|
- choices -- A container of values that should be allowed. If not None,
|
|
after a command-line argument has been converted to the appropriate
|
|
type, an exception will be raised if it is not a member of this
|
|
collection.
|
|
|
|
- required -- True if the action must always be specified at the
|
|
command line. This is only meaningful for optional command-line
|
|
arguments.
|
|
|
|
- help -- The help string describing the argument.
|
|
|
|
- metavar -- The name to be used for the option's argument with the
|
|
help string. If None, the 'dest' value will be used as the name.
|
|
"""
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
nargs=None,
|
|
const=None,
|
|
default=None,
|
|
type=None,
|
|
choices=None,
|
|
required=False,
|
|
help=None,
|
|
metavar=None,
|
|
deprecated=False):
|
|
self.option_strings = option_strings
|
|
self.dest = dest
|
|
self.nargs = nargs
|
|
self.const = const
|
|
self.default = default
|
|
self.type = type
|
|
self.choices = choices
|
|
self.required = required
|
|
self.help = help
|
|
self.metavar = metavar
|
|
self.deprecated = deprecated
|
|
|
|
def _get_kwargs(self):
|
|
names = [
|
|
'option_strings',
|
|
'dest',
|
|
'nargs',
|
|
'const',
|
|
'default',
|
|
'type',
|
|
'choices',
|
|
'required',
|
|
'help',
|
|
'metavar',
|
|
'deprecated',
|
|
]
|
|
return [(name, getattr(self, name)) for name in names]
|
|
|
|
def format_usage(self):
|
|
return self.option_strings[0]
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
raise NotImplementedError('.__call__() not defined')
|
|
|
|
|
|
class BooleanOptionalAction(Action):
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
default=None,
|
|
required=False,
|
|
help=None,
|
|
deprecated=False):
|
|
|
|
_option_strings = []
|
|
for option_string in option_strings:
|
|
_option_strings.append(option_string)
|
|
|
|
if option_string.startswith('--'):
|
|
if option_string.startswith('--no-'):
|
|
raise ValueError(f'invalid option name {option_string!r} '
|
|
f'for BooleanOptionalAction')
|
|
option_string = '--no-' + option_string[2:]
|
|
_option_strings.append(option_string)
|
|
|
|
super().__init__(
|
|
option_strings=_option_strings,
|
|
dest=dest,
|
|
nargs=0,
|
|
default=default,
|
|
required=required,
|
|
help=help,
|
|
deprecated=deprecated)
|
|
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
if option_string in self.option_strings:
|
|
setattr(namespace, self.dest, not option_string.startswith('--no-'))
|
|
|
|
def format_usage(self):
|
|
return ' | '.join(self.option_strings)
|
|
|
|
|
|
class _StoreAction(Action):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
nargs=None,
|
|
const=None,
|
|
default=None,
|
|
type=None,
|
|
choices=None,
|
|
required=False,
|
|
help=None,
|
|
metavar=None,
|
|
deprecated=False):
|
|
if nargs == 0:
|
|
raise ValueError('nargs for store actions must be != 0; if you '
|
|
'have nothing to store, actions such as store '
|
|
'true or store const may be more appropriate')
|
|
if const is not None and nargs != OPTIONAL:
|
|
raise ValueError('nargs must be %r to supply const' % OPTIONAL)
|
|
super(_StoreAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
nargs=nargs,
|
|
const=const,
|
|
default=default,
|
|
type=type,
|
|
choices=choices,
|
|
required=required,
|
|
help=help,
|
|
metavar=metavar,
|
|
deprecated=deprecated)
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
setattr(namespace, self.dest, values)
|
|
|
|
|
|
class _StoreConstAction(Action):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
const=None,
|
|
default=None,
|
|
required=False,
|
|
help=None,
|
|
metavar=None,
|
|
deprecated=False):
|
|
super(_StoreConstAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
nargs=0,
|
|
const=const,
|
|
default=default,
|
|
required=required,
|
|
help=help,
|
|
deprecated=deprecated)
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
setattr(namespace, self.dest, self.const)
|
|
|
|
|
|
class _StoreTrueAction(_StoreConstAction):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
default=False,
|
|
required=False,
|
|
help=None,
|
|
deprecated=False):
|
|
super(_StoreTrueAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
const=True,
|
|
deprecated=deprecated,
|
|
required=required,
|
|
help=help,
|
|
default=default)
|
|
|
|
|
|
class _StoreFalseAction(_StoreConstAction):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
default=True,
|
|
required=False,
|
|
help=None,
|
|
deprecated=False):
|
|
super(_StoreFalseAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
const=False,
|
|
default=default,
|
|
required=required,
|
|
help=help,
|
|
deprecated=deprecated)
|
|
|
|
|
|
class _AppendAction(Action):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
nargs=None,
|
|
const=None,
|
|
default=None,
|
|
type=None,
|
|
choices=None,
|
|
required=False,
|
|
help=None,
|
|
metavar=None,
|
|
deprecated=False):
|
|
if nargs == 0:
|
|
raise ValueError('nargs for append actions must be != 0; if arg '
|
|
'strings are not supplying the value to append, '
|
|
'the append const action may be more appropriate')
|
|
if const is not None and nargs != OPTIONAL:
|
|
raise ValueError('nargs must be %r to supply const' % OPTIONAL)
|
|
super(_AppendAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
nargs=nargs,
|
|
const=const,
|
|
default=default,
|
|
type=type,
|
|
choices=choices,
|
|
required=required,
|
|
help=help,
|
|
metavar=metavar,
|
|
deprecated=deprecated)
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
items = getattr(namespace, self.dest, None)
|
|
items = _copy_items(items)
|
|
items.append(values)
|
|
setattr(namespace, self.dest, items)
|
|
|
|
|
|
class _AppendConstAction(Action):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
const=None,
|
|
default=None,
|
|
required=False,
|
|
help=None,
|
|
metavar=None,
|
|
deprecated=False):
|
|
super(_AppendConstAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
nargs=0,
|
|
const=const,
|
|
default=default,
|
|
required=required,
|
|
help=help,
|
|
metavar=metavar,
|
|
deprecated=deprecated)
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
items = getattr(namespace, self.dest, None)
|
|
items = _copy_items(items)
|
|
items.append(self.const)
|
|
setattr(namespace, self.dest, items)
|
|
|
|
|
|
class _CountAction(Action):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest,
|
|
default=None,
|
|
required=False,
|
|
help=None,
|
|
deprecated=False):
|
|
super(_CountAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
nargs=0,
|
|
default=default,
|
|
required=required,
|
|
help=help,
|
|
deprecated=deprecated)
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
count = getattr(namespace, self.dest, None)
|
|
if count is None:
|
|
count = 0
|
|
setattr(namespace, self.dest, count + 1)
|
|
|
|
|
|
class _HelpAction(Action):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
dest=SUPPRESS,
|
|
default=SUPPRESS,
|
|
help=None,
|
|
deprecated=False):
|
|
super(_HelpAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
default=default,
|
|
nargs=0,
|
|
help=help,
|
|
deprecated=deprecated)
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
parser.print_help()
|
|
parser.exit()
|
|
|
|
|
|
class _VersionAction(Action):
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
version=None,
|
|
dest=SUPPRESS,
|
|
default=SUPPRESS,
|
|
help=None,
|
|
deprecated=False):
|
|
if help is None:
|
|
help = _("show program's version number and exit")
|
|
super(_VersionAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
default=default,
|
|
nargs=0,
|
|
help=help)
|
|
self.version = version
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
version = self.version
|
|
if version is None:
|
|
version = parser.version
|
|
formatter = parser._get_formatter()
|
|
formatter.add_text(version)
|
|
parser._print_message(formatter.format_help(), _sys.stdout)
|
|
parser.exit()
|
|
|
|
|
|
class _SubParsersAction(Action):
|
|
|
|
class _ChoicesPseudoAction(Action):
|
|
|
|
def __init__(self, name, aliases, help):
|
|
metavar = dest = name
|
|
if aliases:
|
|
metavar += ' (%s)' % ', '.join(aliases)
|
|
sup = super(_SubParsersAction._ChoicesPseudoAction, self)
|
|
sup.__init__(option_strings=[], dest=dest, help=help,
|
|
metavar=metavar)
|
|
|
|
def __init__(self,
|
|
option_strings,
|
|
prog,
|
|
parser_class,
|
|
dest=SUPPRESS,
|
|
required=False,
|
|
help=None,
|
|
metavar=None):
|
|
|
|
self._prog_prefix = prog
|
|
self._parser_class = parser_class
|
|
self._name_parser_map = {}
|
|
self._choices_actions = []
|
|
self._deprecated = set()
|
|
|
|
super(_SubParsersAction, self).__init__(
|
|
option_strings=option_strings,
|
|
dest=dest,
|
|
nargs=PARSER,
|
|
choices=self._name_parser_map,
|
|
required=required,
|
|
help=help,
|
|
metavar=metavar)
|
|
|
|
def add_parser(self, name, *, deprecated=False, **kwargs):
|
|
# set prog from the existing prefix
|
|
if kwargs.get('prog') is None:
|
|
kwargs['prog'] = '%s %s' % (self._prog_prefix, name)
|
|
|
|
aliases = kwargs.pop('aliases', ())
|
|
|
|
if name in self._name_parser_map:
|
|
raise ValueError(f'conflicting subparser: {name}')
|
|
for alias in aliases:
|
|
if alias in self._name_parser_map:
|
|
raise ValueError(f'conflicting subparser alias: {alias}')
|
|
|
|
# create a pseudo-action to hold the choice help
|
|
if 'help' in kwargs:
|
|
help = kwargs.pop('help')
|
|
choice_action = self._ChoicesPseudoAction(name, aliases, help)
|
|
self._choices_actions.append(choice_action)
|
|
else:
|
|
choice_action = None
|
|
|
|
# create the parser and add it to the map
|
|
parser = self._parser_class(**kwargs)
|
|
if choice_action is not None:
|
|
parser._check_help(choice_action)
|
|
self._name_parser_map[name] = parser
|
|
|
|
# make parser available under aliases also
|
|
for alias in aliases:
|
|
self._name_parser_map[alias] = parser
|
|
|
|
if deprecated:
|
|
self._deprecated.add(name)
|
|
self._deprecated.update(aliases)
|
|
|
|
return parser
|
|
|
|
def _get_subactions(self):
|
|
return self._choices_actions
|
|
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
parser_name = values[0]
|
|
arg_strings = values[1:]
|
|
|
|
# set the parser name if requested
|
|
if self.dest is not SUPPRESS:
|
|
setattr(namespace, self.dest, parser_name)
|
|
|
|
# select the parser
|
|
try:
|
|
subparser = self._name_parser_map[parser_name]
|
|
except KeyError:
|
|
args = {'parser_name': parser_name,
|
|
'choices': ', '.join(self._name_parser_map)}
|
|
msg = _('unknown parser %(parser_name)r (choices: %(choices)s)') % args
|
|
raise ArgumentError(self, msg)
|
|
|
|
if parser_name in self._deprecated:
|
|
parser._warning(_("command '%(parser_name)s' is deprecated") %
|
|
{'parser_name': parser_name})
|
|
|
|
# parse all the remaining options into the namespace
|
|
# store any unrecognized options on the object, so that the top
|
|
# level parser can decide what to do with them
|
|
|
|
# In case this subparser defines new defaults, we parse them
|
|
# in a new namespace object and then update the original
|
|
# namespace for the relevant parts.
|
|
subnamespace, arg_strings = subparser.parse_known_args(arg_strings, None)
|
|
for key, value in vars(subnamespace).items():
|
|
setattr(namespace, key, value)
|
|
|
|
if arg_strings:
|
|
if not hasattr(namespace, _UNRECOGNIZED_ARGS_ATTR):
|
|
setattr(namespace, _UNRECOGNIZED_ARGS_ATTR, [])
|
|
getattr(namespace, _UNRECOGNIZED_ARGS_ATTR).extend(arg_strings)
|
|
|
|
class _ExtendAction(_AppendAction):
|
|
def __call__(self, parser, namespace, values, option_string=None):
|
|
items = getattr(namespace, self.dest, None)
|
|
items = _copy_items(items)
|
|
items.extend(values)
|
|
setattr(namespace, self.dest, items)
|
|
|
|
# ==============
|
|
# Type classes
|
|
# ==============
|
|
|
|
class FileType(object):
|
|
"""Deprecated factory for creating file object types
|
|
|
|
Instances of FileType are typically passed as type= arguments to the
|
|
ArgumentParser add_argument() method.
|
|
|
|
Keyword Arguments:
|
|
- mode -- A string indicating how the file is to be opened. Accepts the
|
|
same values as the builtin open() function.
|
|
- bufsize -- The file's desired buffer size. Accepts the same values as
|
|
the builtin open() function.
|
|
- encoding -- The file's encoding. Accepts the same values as the
|
|
builtin open() function.
|
|
- errors -- A string indicating how encoding and decoding errors are to
|
|
be handled. Accepts the same value as the builtin open() function.
|
|
"""
|
|
|
|
def __init__(self, mode='r', bufsize=-1, encoding=None, errors=None):
|
|
import warnings
|
|
warnings.warn(
|
|
"FileType is deprecated. Simply open files after parsing arguments.",
|
|
category=PendingDeprecationWarning,
|
|
stacklevel=2
|
|
)
|
|
self._mode = mode
|
|
self._bufsize = bufsize
|
|
self._encoding = encoding
|
|
self._errors = errors
|
|
|
|
def __call__(self, string):
|
|
# the special argument "-" means sys.std{in,out}
|
|
if string == '-':
|
|
if 'r' in self._mode:
|
|
return _sys.stdin.buffer if 'b' in self._mode else _sys.stdin
|
|
elif any(c in self._mode for c in 'wax'):
|
|
return _sys.stdout.buffer if 'b' in self._mode else _sys.stdout
|
|
else:
|
|
msg = _('argument "-" with mode %r') % self._mode
|
|
raise ValueError(msg)
|
|
|
|
# all other arguments are used as file names
|
|
try:
|
|
return open(string, self._mode, self._bufsize, self._encoding,
|
|
self._errors)
|
|
except OSError as e:
|
|
args = {'filename': string, 'error': e}
|
|
message = _("can't open '%(filename)s': %(error)s")
|
|
raise ArgumentTypeError(message % args)
|
|
|
|
def __repr__(self):
|
|
args = self._mode, self._bufsize
|
|
kwargs = [('encoding', self._encoding), ('errors', self._errors)]
|
|
args_str = ', '.join([repr(arg) for arg in args if arg != -1] +
|
|
['%s=%r' % (kw, arg) for kw, arg in kwargs
|
|
if arg is not None])
|
|
return '%s(%s)' % (type(self).__name__, args_str)
|
|
|
|
# ===========================
|
|
# Optional and Positional Parsing
|
|
# ===========================
|
|
|
|
class Namespace(_AttributeHolder):
|
|
"""Simple object for storing attributes.
|
|
|
|
Implements equality by attribute names and values, and provides a simple
|
|
string representation.
|
|
"""
|
|
|
|
def __init__(self, **kwargs):
|
|
for name in kwargs:
|
|
setattr(self, name, kwargs[name])
|
|
|
|
def __eq__(self, other):
|
|
if not isinstance(other, Namespace):
|
|
return NotImplemented
|
|
return vars(self) == vars(other)
|
|
|
|
def __contains__(self, key):
|
|
return key in self.__dict__
|
|
|
|
|
|
class _ActionsContainer(object):
|
|
|
|
def __init__(self,
|
|
description,
|
|
prefix_chars,
|
|
argument_default,
|
|
conflict_handler):
|
|
super(_ActionsContainer, self).__init__()
|
|
|
|
self.description = description
|
|
self.argument_default = argument_default
|
|
self.prefix_chars = prefix_chars
|
|
self.conflict_handler = conflict_handler
|
|
|
|
# set up registries
|
|
self._registries = {}
|
|
|
|
# register actions
|
|
self.register('action', None, _StoreAction)
|
|
self.register('action', 'store', _StoreAction)
|
|
self.register('action', 'store_const', _StoreConstAction)
|
|
self.register('action', 'store_true', _StoreTrueAction)
|
|
self.register('action', 'store_false', _StoreFalseAction)
|
|
self.register('action', 'append', _AppendAction)
|
|
self.register('action', 'append_const', _AppendConstAction)
|
|
self.register('action', 'count', _CountAction)
|
|
self.register('action', 'help', _HelpAction)
|
|
self.register('action', 'version', _VersionAction)
|
|
self.register('action', 'parsers', _SubParsersAction)
|
|
self.register('action', 'extend', _ExtendAction)
|
|
|
|
# raise an exception if the conflict handler is invalid
|
|
self._get_handler()
|
|
|
|
# action storage
|
|
self._actions = []
|
|
self._option_string_actions = {}
|
|
|
|
# groups
|
|
self._action_groups = []
|
|
self._mutually_exclusive_groups = []
|
|
|
|
# defaults storage
|
|
self._defaults = {}
|
|
|
|
# determines whether an "option" looks like a negative number
|
|
self._negative_number_matcher = _re.compile(r'-\.?\d')
|
|
|
|
# whether or not there are any optionals that look like negative
|
|
# numbers -- uses a list so it can be shared and edited
|
|
self._has_negative_number_optionals = []
|
|
|
|
# ====================
|
|
# Registration methods
|
|
# ====================
|
|
def register(self, registry_name, value, object):
|
|
registry = self._registries.setdefault(registry_name, {})
|
|
registry[value] = object
|
|
|
|
def _registry_get(self, registry_name, value, default=None):
|
|
return self._registries[registry_name].get(value, default)
|
|
|
|
# ==================================
|
|
# Namespace default accessor methods
|
|
# ==================================
|
|
def set_defaults(self, **kwargs):
|
|
self._defaults.update(kwargs)
|
|
|
|
# if these defaults match any existing arguments, replace
|
|
# the previous default on the object with the new one
|
|
for action in self._actions:
|
|
if action.dest in kwargs:
|
|
action.default = kwargs[action.dest]
|
|
|
|
def get_default(self, dest):
|
|
for action in self._actions:
|
|
if action.dest == dest and action.default is not None:
|
|
return action.default
|
|
return self._defaults.get(dest, None)
|
|
|
|
|
|
# =======================
|
|
# Adding argument actions
|
|
# =======================
|
|
def add_argument(self, *args, **kwargs):
|
|
"""
|
|
add_argument(dest, ..., name=value, ...)
|
|
add_argument(option_string, option_string, ..., name=value, ...)
|
|
"""
|
|
|
|
# if no positional args are supplied or only one is supplied and
|
|
# it doesn't look like an option string, parse a positional
|
|
# argument
|
|
chars = self.prefix_chars
|
|
if not args or len(args) == 1 and args[0][0] not in chars:
|
|
if args and 'dest' in kwargs:
|
|
raise TypeError('dest supplied twice for positional argument,'
|
|
' did you mean metavar?')
|
|
kwargs = self._get_positional_kwargs(*args, **kwargs)
|
|
|
|
# otherwise, we're adding an optional argument
|
|
else:
|
|
kwargs = self._get_optional_kwargs(*args, **kwargs)
|
|
|
|
# if no default was supplied, use the parser-level default
|
|
if 'default' not in kwargs:
|
|
dest = kwargs['dest']
|
|
if dest in self._defaults:
|
|
kwargs['default'] = self._defaults[dest]
|
|
elif self.argument_default is not None:
|
|
kwargs['default'] = self.argument_default
|
|
|
|
# create the action object, and add it to the parser
|
|
action_name = kwargs.get('action')
|
|
action_class = self._pop_action_class(kwargs)
|
|
if not callable(action_class):
|
|
raise ValueError('unknown action {action_class!r}')
|
|
action = action_class(**kwargs)
|
|
|
|
# raise an error if action for positional argument does not
|
|
# consume arguments
|
|
if not action.option_strings and action.nargs == 0:
|
|
raise ValueError(f'action {action_name!r} is not valid for positional arguments')
|
|
|
|
# raise an error if the action type is not callable
|
|
type_func = self._registry_get('type', action.type, action.type)
|
|
if not callable(type_func):
|
|
raise TypeError(f'{type_func!r} is not callable')
|
|
|
|
if type_func is FileType:
|
|
raise TypeError(f'{type_func!r} is a FileType class object, '
|
|
f'instance of it must be passed')
|
|
|
|
# raise an error if the metavar does not match the type
|
|
if hasattr(self, "_get_formatter"):
|
|
formatter = self._get_formatter()
|
|
try:
|
|
formatter._format_args(action, None)
|
|
except TypeError:
|
|
raise ValueError("length of metavar tuple does not match nargs")
|
|
self._check_help(action)
|
|
return self._add_action(action)
|
|
|
|
def add_argument_group(self, *args, **kwargs):
|
|
group = _ArgumentGroup(self, *args, **kwargs)
|
|
self._action_groups.append(group)
|
|
return group
|
|
|
|
def add_mutually_exclusive_group(self, **kwargs):
|
|
group = _MutuallyExclusiveGroup(self, **kwargs)
|
|
self._mutually_exclusive_groups.append(group)
|
|
return group
|
|
|
|
def _add_action(self, action):
|
|
# resolve any conflicts
|
|
self._check_conflict(action)
|
|
|
|
# add to actions list
|
|
self._actions.append(action)
|
|
action.container = self
|
|
|
|
# index the action by any option strings it has
|
|
for option_string in action.option_strings:
|
|
self._option_string_actions[option_string] = action
|
|
|
|
# set the flag if any option strings look like negative numbers
|
|
for option_string in action.option_strings:
|
|
if self._negative_number_matcher.match(option_string):
|
|
if not self._has_negative_number_optionals:
|
|
self._has_negative_number_optionals.append(True)
|
|
|
|
# return the created action
|
|
return action
|
|
|
|
def _remove_action(self, action):
|
|
self._actions.remove(action)
|
|
|
|
def _add_container_actions(self, container):
|
|
# collect groups by titles
|
|
title_group_map = {}
|
|
for group in self._action_groups:
|
|
if group.title in title_group_map:
|
|
# This branch could happen if a derived class added
|
|
# groups with duplicated titles in __init__
|
|
msg = f'cannot merge actions - two groups are named {group.title!r}'
|
|
raise ValueError(msg)
|
|
title_group_map[group.title] = group
|
|
|
|
# map each action to its group
|
|
group_map = {}
|
|
for group in container._action_groups:
|
|
|
|
# if a group with the title exists, use that, otherwise
|
|
# create a new group matching the container's group
|
|
if group.title not in title_group_map:
|
|
title_group_map[group.title] = self.add_argument_group(
|
|
title=group.title,
|
|
description=group.description,
|
|
conflict_handler=group.conflict_handler)
|
|
|
|
# map the actions to their new group
|
|
for action in group._group_actions:
|
|
group_map[action] = title_group_map[group.title]
|
|
|
|
# add container's mutually exclusive groups
|
|
# NOTE: if add_mutually_exclusive_group ever gains title= and
|
|
# description= then this code will need to be expanded as above
|
|
for group in container._mutually_exclusive_groups:
|
|
if group._container is container:
|
|
cont = self
|
|
else:
|
|
cont = title_group_map[group._container.title]
|
|
mutex_group = cont.add_mutually_exclusive_group(
|
|
required=group.required)
|
|
|
|
# map the actions to their new mutex group
|
|
for action in group._group_actions:
|
|
group_map[action] = mutex_group
|
|
|
|
# add all actions to this container or their group
|
|
for action in container._actions:
|
|
group_map.get(action, self)._add_action(action)
|
|
|
|
def _get_positional_kwargs(self, dest, **kwargs):
|
|
# make sure required is not specified
|
|
if 'required' in kwargs:
|
|
msg = "'required' is an invalid argument for positionals"
|
|
raise TypeError(msg)
|
|
|
|
# mark positional arguments as required if at least one is
|
|
# always required
|
|
nargs = kwargs.get('nargs')
|
|
if nargs == 0:
|
|
raise ValueError('nargs for positionals must be != 0')
|
|
if nargs not in [OPTIONAL, ZERO_OR_MORE, REMAINDER, SUPPRESS]:
|
|
kwargs['required'] = True
|
|
|
|
# return the keyword arguments with no option strings
|
|
return dict(kwargs, dest=dest, option_strings=[])
|
|
|
|
def _get_optional_kwargs(self, *args, **kwargs):
|
|
# determine short and long option strings
|
|
option_strings = []
|
|
long_option_strings = []
|
|
for option_string in args:
|
|
# error on strings that don't start with an appropriate prefix
|
|
if not option_string[0] in self.prefix_chars:
|
|
raise ValueError(
|
|
f'invalid option string {option_string!r}: '
|
|
f'must start with a character {self.prefix_chars!r}')
|
|
|
|
# strings starting with two prefix characters are long options
|
|
option_strings.append(option_string)
|
|
if len(option_string) > 1 and option_string[1] in self.prefix_chars:
|
|
long_option_strings.append(option_string)
|
|
|
|
# infer destination, '--foo-bar' -> 'foo_bar' and '-x' -> 'x'
|
|
dest = kwargs.pop('dest', None)
|
|
if dest is None:
|
|
if long_option_strings:
|
|
dest_option_string = long_option_strings[0]
|
|
else:
|
|
dest_option_string = option_strings[0]
|
|
dest = dest_option_string.lstrip(self.prefix_chars)
|
|
if not dest:
|
|
msg = f'dest= is required for options like {option_string!r}'
|
|
raise TypeError(msg)
|
|
dest = dest.replace('-', '_')
|
|
|
|
# return the updated keyword arguments
|
|
return dict(kwargs, dest=dest, option_strings=option_strings)
|
|
|
|
def _pop_action_class(self, kwargs, default=None):
|
|
action = kwargs.pop('action', default)
|
|
return self._registry_get('action', action, action)
|
|
|
|
def _get_handler(self):
|
|
# determine function from conflict handler string
|
|
handler_func_name = '_handle_conflict_%s' % self.conflict_handler
|
|
try:
|
|
return getattr(self, handler_func_name)
|
|
except AttributeError:
|
|
msg = f'invalid conflict_resolution value: {self.conflict_handler!r}'
|
|
raise ValueError(msg)
|
|
|
|
def _check_conflict(self, action):
|
|
|
|
# find all options that conflict with this option
|
|
confl_optionals = []
|
|
for option_string in action.option_strings:
|
|
if option_string in self._option_string_actions:
|
|
confl_optional = self._option_string_actions[option_string]
|
|
confl_optionals.append((option_string, confl_optional))
|
|
|
|
# resolve any conflicts
|
|
if confl_optionals:
|
|
conflict_handler = self._get_handler()
|
|
conflict_handler(action, confl_optionals)
|
|
|
|
def _handle_conflict_error(self, action, conflicting_actions):
|
|
message = ngettext('conflicting option string: %s',
|
|
'conflicting option strings: %s',
|
|
len(conflicting_actions))
|
|
conflict_string = ', '.join([option_string
|
|
for option_string, action
|
|
in conflicting_actions])
|
|
raise ArgumentError(action, message % conflict_string)
|
|
|
|
def _handle_conflict_resolve(self, action, conflicting_actions):
|
|
|
|
# remove all conflicting options
|
|
for option_string, action in conflicting_actions:
|
|
|
|
# remove the conflicting option
|
|
action.option_strings.remove(option_string)
|
|
self._option_string_actions.pop(option_string, None)
|
|
|
|
# if the option now has no option string, remove it from the
|
|
# container holding it
|
|
if not action.option_strings:
|
|
action.container._remove_action(action)
|
|
|
|
def _check_help(self, action):
|
|
if action.help and hasattr(self, "_get_formatter"):
|
|
formatter = self._get_formatter()
|
|
try:
|
|
formatter._expand_help(action)
|
|
except (ValueError, TypeError, KeyError) as exc:
|
|
raise ValueError('badly formed help string') from exc
|
|
|
|
|
|
class _ArgumentGroup(_ActionsContainer):
|
|
|
|
def __init__(self, container, title=None, description=None, **kwargs):
|
|
if 'prefix_chars' in kwargs:
|
|
import warnings
|
|
depr_msg = (
|
|
"The use of the undocumented 'prefix_chars' parameter in "
|
|
"ArgumentParser.add_argument_group() is deprecated."
|
|
)
|
|
warnings.warn(depr_msg, DeprecationWarning, stacklevel=3)
|
|
|
|
# add any missing keyword arguments by checking the container
|
|
update = kwargs.setdefault
|
|
update('conflict_handler', container.conflict_handler)
|
|
update('prefix_chars', container.prefix_chars)
|
|
update('argument_default', container.argument_default)
|
|
super_init = super(_ArgumentGroup, self).__init__
|
|
super_init(description=description, **kwargs)
|
|
|
|
# group attributes
|
|
self.title = title
|
|
self._group_actions = []
|
|
|
|
# share most attributes with the container
|
|
self._registries = container._registries
|
|
self._actions = container._actions
|
|
self._option_string_actions = container._option_string_actions
|
|
self._defaults = container._defaults
|
|
self._has_negative_number_optionals = \
|
|
container._has_negative_number_optionals
|
|
self._mutually_exclusive_groups = container._mutually_exclusive_groups
|
|
|
|
def _add_action(self, action):
|
|
action = super(_ArgumentGroup, self)._add_action(action)
|
|
self._group_actions.append(action)
|
|
return action
|
|
|
|
def _remove_action(self, action):
|
|
super(_ArgumentGroup, self)._remove_action(action)
|
|
self._group_actions.remove(action)
|
|
|
|
def add_argument_group(self, *args, **kwargs):
|
|
import warnings
|
|
warnings.warn(
|
|
"Nesting argument groups is deprecated.",
|
|
category=DeprecationWarning,
|
|
stacklevel=2
|
|
)
|
|
return super().add_argument_group(*args, **kwargs)
|
|
|
|
|
|
class _MutuallyExclusiveGroup(_ArgumentGroup):
|
|
|
|
def __init__(self, container, required=False):
|
|
super(_MutuallyExclusiveGroup, self).__init__(container)
|
|
self.required = required
|
|
self._container = container
|
|
|
|
def _add_action(self, action):
|
|
if action.required:
|
|
msg = 'mutually exclusive arguments must be optional'
|
|
raise ValueError(msg)
|
|
action = self._container._add_action(action)
|
|
self._group_actions.append(action)
|
|
return action
|
|
|
|
def _remove_action(self, action):
|
|
self._container._remove_action(action)
|
|
self._group_actions.remove(action)
|
|
|
|
def add_mutually_exclusive_group(self, *args, **kwargs):
|
|
import warnings
|
|
warnings.warn(
|
|
"Nesting mutually exclusive groups is deprecated.",
|
|
category=DeprecationWarning,
|
|
stacklevel=2
|
|
)
|
|
return super().add_mutually_exclusive_group(*args, **kwargs)
|
|
|
|
|
|
def _prog_name(prog=None):
|
|
if prog is not None:
|
|
return prog
|
|
arg0 = _sys.argv[0]
|
|
try:
|
|
modspec = _sys.modules['__main__'].__spec__
|
|
except (KeyError, AttributeError):
|
|
# possibly PYTHONSTARTUP or -X presite or other weird edge case
|
|
# no good answer here, so fall back to the default
|
|
modspec = None
|
|
if modspec is None:
|
|
# simple script
|
|
return _os.path.basename(arg0)
|
|
py = _os.path.basename(_sys.executable)
|
|
if modspec.name != '__main__':
|
|
# imported module or package
|
|
modname = modspec.name.removesuffix('.__main__')
|
|
return f'{py} -m {modname}'
|
|
# directory or ZIP file
|
|
return f'{py} {arg0}'
|
|
|
|
|
|
class ArgumentParser(_AttributeHolder, _ActionsContainer):
|
|
"""Object for parsing command line strings into Python objects.
|
|
|
|
Keyword Arguments:
|
|
- prog -- The name of the program (default:
|
|
``os.path.basename(sys.argv[0])``)
|
|
- usage -- A usage message (default: auto-generated from arguments)
|
|
- description -- A description of what the program does
|
|
- epilog -- Text following the argument descriptions
|
|
- parents -- Parsers whose arguments should be copied into this one
|
|
- formatter_class -- HelpFormatter class for printing help messages
|
|
- prefix_chars -- Characters that prefix optional arguments
|
|
- fromfile_prefix_chars -- Characters that prefix files containing
|
|
additional arguments
|
|
- argument_default -- The default value for all arguments
|
|
- conflict_handler -- String indicating how to handle conflicts
|
|
- add_help -- Add a -h/-help option
|
|
- allow_abbrev -- Allow long options to be abbreviated unambiguously
|
|
- exit_on_error -- Determines whether or not ArgumentParser exits with
|
|
error info when an error occurs
|
|
- suggest_on_error - Enables suggestions for mistyped argument choices
|
|
and subparser names. (default: ``False``)
|
|
"""
|
|
|
|
def __init__(self,
|
|
prog=None,
|
|
usage=None,
|
|
description=None,
|
|
epilog=None,
|
|
parents=[],
|
|
formatter_class=HelpFormatter,
|
|
prefix_chars='-',
|
|
fromfile_prefix_chars=None,
|
|
argument_default=None,
|
|
conflict_handler='error',
|
|
add_help=True,
|
|
allow_abbrev=True,
|
|
exit_on_error=True,
|
|
suggest_on_error=False):
|
|
|
|
superinit = super(ArgumentParser, self).__init__
|
|
superinit(description=description,
|
|
prefix_chars=prefix_chars,
|
|
argument_default=argument_default,
|
|
conflict_handler=conflict_handler)
|
|
|
|
self.prog = _prog_name(prog)
|
|
self.usage = usage
|
|
self.epilog = epilog
|
|
self.formatter_class = formatter_class
|
|
self.fromfile_prefix_chars = fromfile_prefix_chars
|
|
self.add_help = add_help
|
|
self.allow_abbrev = allow_abbrev
|
|
self.exit_on_error = exit_on_error
|
|
self.suggest_on_error = suggest_on_error
|
|
|
|
add_group = self.add_argument_group
|
|
self._positionals = add_group(_('positional arguments'))
|
|
self._optionals = add_group(_('options'))
|
|
self._subparsers = None
|
|
|
|
# register types
|
|
def identity(string):
|
|
return string
|
|
self.register('type', None, identity)
|
|
|
|
# add help argument if necessary
|
|
# (using explicit default to override global argument_default)
|
|
default_prefix = '-' if '-' in prefix_chars else prefix_chars[0]
|
|
if self.add_help:
|
|
self.add_argument(
|
|
default_prefix+'h', default_prefix*2+'help',
|
|
action='help', default=SUPPRESS,
|
|
help=_('show this help message and exit'))
|
|
|
|
# add parent arguments and defaults
|
|
for parent in parents:
|
|
if not isinstance(parent, ArgumentParser):
|
|
raise TypeError('parents must be a list of ArgumentParser')
|
|
self._add_container_actions(parent)
|
|
defaults = parent._defaults
|
|
self._defaults.update(defaults)
|
|
|
|
# =======================
|
|
# Pretty __repr__ methods
|
|
# =======================
|
|
def _get_kwargs(self):
|
|
names = [
|
|
'prog',
|
|
'usage',
|
|
'description',
|
|
'formatter_class',
|
|
'conflict_handler',
|
|
'add_help',
|
|
]
|
|
return [(name, getattr(self, name)) for name in names]
|
|
|
|
# ==================================
|
|
# Optional/Positional adding methods
|
|
# ==================================
|
|
def add_subparsers(self, **kwargs):
|
|
if self._subparsers is not None:
|
|
raise ValueError('cannot have multiple subparser arguments')
|
|
|
|
# add the parser class to the arguments if it's not present
|
|
kwargs.setdefault('parser_class', type(self))
|
|
|
|
if 'title' in kwargs or 'description' in kwargs:
|
|
title = kwargs.pop('title', _('subcommands'))
|
|
description = kwargs.pop('description', None)
|
|
self._subparsers = self.add_argument_group(title, description)
|
|
else:
|
|
self._subparsers = self._positionals
|
|
|
|
# prog defaults to the usage message of this parser, skipping
|
|
# optional arguments and with no "usage:" prefix
|
|
if kwargs.get('prog') is None:
|
|
formatter = self._get_formatter()
|
|
positionals = self._get_positional_actions()
|
|
groups = self._mutually_exclusive_groups
|
|
formatter.add_usage(None, positionals, groups, '')
|
|
kwargs['prog'] = formatter.format_help().strip()
|
|
|
|
# create the parsers action and add it to the positionals list
|
|
parsers_class = self._pop_action_class(kwargs, 'parsers')
|
|
action = parsers_class(option_strings=[], **kwargs)
|
|
self._check_help(action)
|
|
self._subparsers._add_action(action)
|
|
|
|
# return the created parsers action
|
|
return action
|
|
|
|
def _add_action(self, action):
|
|
if action.option_strings:
|
|
self._optionals._add_action(action)
|
|
else:
|
|
self._positionals._add_action(action)
|
|
return action
|
|
|
|
def _get_optional_actions(self):
|
|
return [action
|
|
for action in self._actions
|
|
if action.option_strings]
|
|
|
|
def _get_positional_actions(self):
|
|
return [action
|
|
for action in self._actions
|
|
if not action.option_strings]
|
|
|
|
# =====================================
|
|
# Command line argument parsing methods
|
|
# =====================================
|
|
def parse_args(self, args=None, namespace=None):
|
|
args, argv = self.parse_known_args(args, namespace)
|
|
if argv:
|
|
msg = _('unrecognized arguments: %s') % ' '.join(argv)
|
|
if self.exit_on_error:
|
|
self.error(msg)
|
|
else:
|
|
raise ArgumentError(None, msg)
|
|
return args
|
|
|
|
def parse_known_args(self, args=None, namespace=None):
|
|
return self._parse_known_args2(args, namespace, intermixed=False)
|
|
|
|
def _parse_known_args2(self, args, namespace, intermixed):
|
|
if args is None:
|
|
# args default to the system args
|
|
args = _sys.argv[1:]
|
|
else:
|
|
# make sure that args are mutable
|
|
args = list(args)
|
|
|
|
# default Namespace built from parser defaults
|
|
if namespace is None:
|
|
namespace = Namespace()
|
|
|
|
# add any action defaults that aren't present
|
|
for action in self._actions:
|
|
if action.dest is not SUPPRESS:
|
|
if not hasattr(namespace, action.dest):
|
|
if action.default is not SUPPRESS:
|
|
setattr(namespace, action.dest, action.default)
|
|
|
|
# add any parser defaults that aren't present
|
|
for dest in self._defaults:
|
|
if not hasattr(namespace, dest):
|
|
setattr(namespace, dest, self._defaults[dest])
|
|
|
|
# parse the arguments and exit if there are any errors
|
|
if self.exit_on_error:
|
|
try:
|
|
namespace, args = self._parse_known_args(args, namespace, intermixed)
|
|
except ArgumentError as err:
|
|
self.error(str(err))
|
|
else:
|
|
namespace, args = self._parse_known_args(args, namespace, intermixed)
|
|
|
|
if hasattr(namespace, _UNRECOGNIZED_ARGS_ATTR):
|
|
args.extend(getattr(namespace, _UNRECOGNIZED_ARGS_ATTR))
|
|
delattr(namespace, _UNRECOGNIZED_ARGS_ATTR)
|
|
return namespace, args
|
|
|
|
def _parse_known_args(self, arg_strings, namespace, intermixed):
|
|
# 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 = {}
|
|
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_tuples = self._parse_optional(arg_string)
|
|
if option_tuples is None:
|
|
pattern = 'A'
|
|
else:
|
|
option_string_indices[i] = option_tuples
|
|
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()
|
|
warned = set()
|
|
|
|
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
|
|
if action.option_strings or argument_strings:
|
|
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:
|
|
action(self, namespace, argument_values, option_string)
|
|
|
|
# function to convert arg_strings into an optional action
|
|
def consume_optional(start_index):
|
|
|
|
# get the optional identified at this index
|
|
option_tuples = option_string_indices[start_index]
|
|
# if multiple actions match, the option string was ambiguous
|
|
if len(option_tuples) > 1:
|
|
options = ', '.join([option_string
|
|
for action, option_string, sep, explicit_arg in option_tuples])
|
|
args = {'option': arg_strings[start_index], 'matches': options}
|
|
msg = _('ambiguous option: %(option)s could match %(matches)s')
|
|
raise ArgumentError(None, msg % args)
|
|
|
|
action, option_string, sep, explicit_arg = option_tuples[0]
|
|
|
|
# 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])
|
|
extras_pattern.append('O')
|
|
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
|
|
and explicit_arg != ''
|
|
):
|
|
if sep or explicit_arg[0] in chars:
|
|
msg = _('ignored explicit argument %r')
|
|
raise ArgumentError(action, msg % explicit_arg)
|
|
action_tuples.append((action, [], option_string))
|
|
char = option_string[0]
|
|
option_string = char + explicit_arg[0]
|
|
optionals_map = self._option_string_actions
|
|
if option_string in optionals_map:
|
|
action = optionals_map[option_string]
|
|
explicit_arg = explicit_arg[1:]
|
|
if not explicit_arg:
|
|
sep = explicit_arg = None
|
|
elif explicit_arg[0] == '=':
|
|
sep = '='
|
|
explicit_arg = explicit_arg[1:]
|
|
else:
|
|
sep = ''
|
|
else:
|
|
extras.append(char + explicit_arg)
|
|
extras_pattern.append('O')
|
|
stop = start_index + 1
|
|
break
|
|
# 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:]
|
|
arg_count = match_argument(action, selected_patterns)
|
|
stop = start + arg_count
|
|
args = arg_strings[start:stop]
|
|
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:
|
|
if action.deprecated and option_string not in warned:
|
|
self._warning(_("option '%(option)s' is deprecated") %
|
|
{'option': option_string})
|
|
warned.add(option_string)
|
|
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):
|
|
args = arg_strings[start_index: start_index + arg_count]
|
|
# Strip out the first '--' if it is not in REMAINDER arg.
|
|
if action.nargs == PARSER:
|
|
if arg_strings_pattern[start_index] == '-':
|
|
assert args[0] == '--'
|
|
args.remove('--')
|
|
elif action.nargs != REMAINDER:
|
|
if (arg_strings_pattern.find('-', start_index,
|
|
start_index + arg_count) >= 0):
|
|
args.remove('--')
|
|
start_index += arg_count
|
|
if args and action.deprecated and action.dest not in warned:
|
|
self._warning(_("argument '%(argument_name)s' is deprecated") %
|
|
{'argument_name': action.dest})
|
|
warned.add(action.dest)
|
|
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 = []
|
|
extras_pattern = []
|
|
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 = start_index
|
|
while next_option_string_index <= max_option_string_index:
|
|
if next_option_string_index in option_string_indices:
|
|
break
|
|
next_option_string_index += 1
|
|
if not intermixed and 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)
|
|
extras_pattern.extend(arg_strings_pattern[start_index:next_option_string_index])
|
|
start_index = next_option_string_index
|
|
|
|
# consume the next optional and any arguments for it
|
|
start_index = consume_optional(start_index)
|
|
|
|
if not intermixed:
|
|
# 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:])
|
|
else:
|
|
extras.extend(arg_strings[start_index:])
|
|
extras_pattern.extend(arg_strings_pattern[start_index:])
|
|
extras_pattern = ''.join(extras_pattern)
|
|
assert len(extras_pattern) == len(extras)
|
|
# consume all positionals
|
|
arg_strings = [s for s, c in zip(extras, extras_pattern) if c != 'O']
|
|
arg_strings_pattern = extras_pattern.replace('O', '')
|
|
stop_index = consume_positionals(0)
|
|
# leave unknown optionals and non-consumed positionals in extras
|
|
for i, c in enumerate(extras_pattern):
|
|
if not stop_index:
|
|
break
|
|
if c != 'O':
|
|
stop_index -= 1
|
|
extras[i] = None
|
|
extras = [s for s in extras if s is not None]
|
|
|
|
# make sure all required actions were present and also convert
|
|
# action defaults which were not given as arguments
|
|
required_actions = []
|
|
for action in self._actions:
|
|
if action not in seen_actions:
|
|
if action.required:
|
|
required_actions.append(_get_action_name(action))
|
|
else:
|
|
# Convert action default now instead of doing it before
|
|
# parsing arguments to avoid calling convert functions
|
|
# twice (which may fail) if the argument was given, but
|
|
# only if it was defined already in the namespace
|
|
if (action.default is not None and
|
|
isinstance(action.default, str) and
|
|
hasattr(namespace, action.dest) and
|
|
action.default is getattr(namespace, action.dest)):
|
|
setattr(namespace, action.dest,
|
|
self._get_value(action, action.default))
|
|
|
|
if required_actions:
|
|
raise ArgumentError(None, _('the following arguments are required: %s') %
|
|
', '.join(required_actions))
|
|
|
|
# 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')
|
|
raise ArgumentError(None, msg % ' '.join(names))
|
|
|
|
# return the updated namespace and the extra arguments
|
|
return namespace, extras
|
|
|
|
def _read_args_from_files(self, arg_strings):
|
|
# expand arguments referencing files
|
|
new_arg_strings = []
|
|
for arg_string in arg_strings:
|
|
|
|
# for regular arguments, just add them back into the list
|
|
if not arg_string or arg_string[0] not in self.fromfile_prefix_chars:
|
|
new_arg_strings.append(arg_string)
|
|
|
|
# replace arguments referencing files with the file content
|
|
else:
|
|
try:
|
|
with open(arg_string[1:],
|
|
encoding=_sys.getfilesystemencoding(),
|
|
errors=_sys.getfilesystemencodeerrors()) as args_file:
|
|
arg_strings = []
|
|
for arg_line in args_file.read().splitlines():
|
|
for arg in self.convert_arg_line_to_args(arg_line):
|
|
arg_strings.append(arg)
|
|
arg_strings = self._read_args_from_files(arg_strings)
|
|
new_arg_strings.extend(arg_strings)
|
|
except OSError as err:
|
|
raise ArgumentError(None, str(err))
|
|
|
|
# return the modified argument list
|
|
return new_arg_strings
|
|
|
|
def convert_arg_line_to_args(self, arg_line):
|
|
return [arg_line]
|
|
|
|
def _match_argument(self, action, arg_strings_pattern):
|
|
# match the pattern for this action to the arg strings
|
|
nargs_pattern = self._get_nargs_pattern(action)
|
|
match = _re.match(nargs_pattern, arg_strings_pattern)
|
|
|
|
# raise an exception if we weren't able to find a match
|
|
if match is None:
|
|
nargs_errors = {
|
|
None: _('expected one argument'),
|
|
OPTIONAL: _('expected at most one argument'),
|
|
ONE_OR_MORE: _('expected at least one argument'),
|
|
}
|
|
msg = nargs_errors.get(action.nargs)
|
|
if msg is None:
|
|
msg = ngettext('expected %s argument',
|
|
'expected %s arguments',
|
|
action.nargs) % action.nargs
|
|
raise ArgumentError(action, msg)
|
|
|
|
# return the number of arguments matched
|
|
return len(match.group(1))
|
|
|
|
def _match_arguments_partial(self, actions, arg_strings_pattern):
|
|
# progressively shorten the actions list by slicing off the
|
|
# final actions until we find a match
|
|
for i in range(len(actions), 0, -1):
|
|
actions_slice = actions[:i]
|
|
pattern = ''.join([self._get_nargs_pattern(action)
|
|
for action in actions_slice])
|
|
match = _re.match(pattern, arg_strings_pattern)
|
|
if match is not None:
|
|
result = [len(string) for string in match.groups()]
|
|
if (match.end() < len(arg_strings_pattern)
|
|
and arg_strings_pattern[match.end()] == 'O'):
|
|
while result and not result[-1]:
|
|
del result[-1]
|
|
return result
|
|
return []
|
|
|
|
def _parse_optional(self, arg_string):
|
|
# if it's an empty string, it was meant to be a positional
|
|
if not arg_string:
|
|
return None
|
|
|
|
# if it doesn't start with a prefix, it was meant to be positional
|
|
if not arg_string[0] in self.prefix_chars:
|
|
return None
|
|
|
|
# if the option string is present in the parser, return the action
|
|
if arg_string in self._option_string_actions:
|
|
action = self._option_string_actions[arg_string]
|
|
return [(action, arg_string, None, None)]
|
|
|
|
# if it's just a single character, it was meant to be positional
|
|
if len(arg_string) == 1:
|
|
return None
|
|
|
|
# if the option string before the "=" is present, return the action
|
|
option_string, sep, explicit_arg = arg_string.partition('=')
|
|
if sep and option_string in self._option_string_actions:
|
|
action = self._option_string_actions[option_string]
|
|
return [(action, option_string, sep, explicit_arg)]
|
|
|
|
# search through all possible prefixes of the option string
|
|
# and all actions in the parser for possible interpretations
|
|
option_tuples = self._get_option_tuples(arg_string)
|
|
|
|
if option_tuples:
|
|
return option_tuples
|
|
|
|
# if it was not found as an option, but it looks like a negative
|
|
# number, it was meant to be positional
|
|
# unless there are negative-number-like options
|
|
if self._negative_number_matcher.match(arg_string):
|
|
if not self._has_negative_number_optionals:
|
|
return None
|
|
|
|
# if it contains a space, it was meant to be a positional
|
|
if ' ' in arg_string:
|
|
return None
|
|
|
|
# it was meant to be an optional but there is no such option
|
|
# in this parser (though it might be a valid option in a subparser)
|
|
return [(None, arg_string, None, None)]
|
|
|
|
def _get_option_tuples(self, option_string):
|
|
result = []
|
|
|
|
# option strings starting with two prefix characters are only
|
|
# split at the '='
|
|
chars = self.prefix_chars
|
|
if option_string[0] in chars and option_string[1] in chars:
|
|
if self.allow_abbrev:
|
|
option_prefix, sep, explicit_arg = option_string.partition('=')
|
|
if not sep:
|
|
sep = explicit_arg = None
|
|
for option_string in self._option_string_actions:
|
|
if option_string.startswith(option_prefix):
|
|
action = self._option_string_actions[option_string]
|
|
tup = action, option_string, sep, explicit_arg
|
|
result.append(tup)
|
|
|
|
# single character options can be concatenated with their arguments
|
|
# but multiple character options always have to have their argument
|
|
# separate
|
|
elif option_string[0] in chars and option_string[1] not in chars:
|
|
option_prefix, sep, explicit_arg = option_string.partition('=')
|
|
if not sep:
|
|
sep = explicit_arg = None
|
|
short_option_prefix = option_string[:2]
|
|
short_explicit_arg = option_string[2:]
|
|
|
|
for option_string in self._option_string_actions:
|
|
if option_string == short_option_prefix:
|
|
action = self._option_string_actions[option_string]
|
|
tup = action, option_string, '', short_explicit_arg
|
|
result.append(tup)
|
|
elif self.allow_abbrev and option_string.startswith(option_prefix):
|
|
action = self._option_string_actions[option_string]
|
|
tup = action, option_string, sep, explicit_arg
|
|
result.append(tup)
|
|
|
|
# shouldn't ever get here
|
|
else:
|
|
raise ArgumentError(None, _('unexpected option string: %s') % option_string)
|
|
|
|
# return the collected option tuples
|
|
return result
|
|
|
|
def _get_nargs_pattern(self, action):
|
|
# in all examples below, we have to allow for '--' args
|
|
# which are represented as '-' in the pattern
|
|
nargs = action.nargs
|
|
# if this is an optional action, -- is not allowed
|
|
option = action.option_strings
|
|
|
|
# the default (None) is assumed to be a single argument
|
|
if nargs is None:
|
|
nargs_pattern = '([A])' if option else '(-*A-*)'
|
|
|
|
# allow zero or one arguments
|
|
elif nargs == OPTIONAL:
|
|
nargs_pattern = '(A?)' if option else '(-*A?-*)'
|
|
|
|
# allow zero or more arguments
|
|
elif nargs == ZERO_OR_MORE:
|
|
nargs_pattern = '(A*)' if option else '(-*[A-]*)'
|
|
|
|
# allow one or more arguments
|
|
elif nargs == ONE_OR_MORE:
|
|
nargs_pattern = '(A+)' if option else '(-*A[A-]*)'
|
|
|
|
# allow any number of options or arguments
|
|
elif nargs == REMAINDER:
|
|
nargs_pattern = '([AO]*)' if option else '(.*)'
|
|
|
|
# allow one argument followed by any number of options or arguments
|
|
elif nargs == PARSER:
|
|
nargs_pattern = '(A[AO]*)' if option else '(-*A[-AO]*)'
|
|
|
|
# suppress action, like nargs=0
|
|
elif nargs == SUPPRESS:
|
|
nargs_pattern = '()' if option else '(-*)'
|
|
|
|
# all others should be integers
|
|
else:
|
|
nargs_pattern = '([AO]{%d})' % nargs if option else '((?:-*A){%d}-*)' % nargs
|
|
|
|
# return the pattern
|
|
return nargs_pattern
|
|
|
|
# ========================
|
|
# Alt command line argument parsing, allowing free intermix
|
|
# ========================
|
|
|
|
def parse_intermixed_args(self, args=None, namespace=None):
|
|
args, argv = self.parse_known_intermixed_args(args, namespace)
|
|
if argv:
|
|
msg = _('unrecognized arguments: %s') % ' '.join(argv)
|
|
if self.exit_on_error:
|
|
self.error(msg)
|
|
else:
|
|
raise ArgumentError(None, msg)
|
|
return args
|
|
|
|
def parse_known_intermixed_args(self, args=None, namespace=None):
|
|
# returns a namespace and list of extras
|
|
#
|
|
# positional can be freely intermixed with optionals. optionals are
|
|
# first parsed with all positional arguments deactivated. The 'extras'
|
|
# are then parsed. If the parser definition is incompatible with the
|
|
# intermixed assumptions (e.g. use of REMAINDER, subparsers) a
|
|
# TypeError is raised.
|
|
|
|
positionals = self._get_positional_actions()
|
|
a = [action for action in positionals
|
|
if action.nargs in [PARSER, REMAINDER]]
|
|
if a:
|
|
raise TypeError('parse_intermixed_args: positional arg'
|
|
' with nargs=%s'%a[0].nargs)
|
|
|
|
return self._parse_known_args2(args, namespace, intermixed=True)
|
|
|
|
# ========================
|
|
# Value conversion methods
|
|
# ========================
|
|
def _get_values(self, action, arg_strings):
|
|
# optional argument produces a default when not present
|
|
if not arg_strings and action.nargs == OPTIONAL:
|
|
if action.option_strings:
|
|
value = action.const
|
|
else:
|
|
value = action.default
|
|
if isinstance(value, str) and value is not SUPPRESS:
|
|
value = self._get_value(action, value)
|
|
|
|
# when nargs='*' on a positional, if there were no command-line
|
|
# args, use the default if it is anything other than None
|
|
elif (not arg_strings and action.nargs == ZERO_OR_MORE and
|
|
not action.option_strings):
|
|
if action.default is not None:
|
|
value = action.default
|
|
else:
|
|
value = []
|
|
|
|
# single argument or optional argument produces a single value
|
|
elif len(arg_strings) == 1 and action.nargs in [None, OPTIONAL]:
|
|
arg_string, = arg_strings
|
|
value = self._get_value(action, arg_string)
|
|
self._check_value(action, value)
|
|
|
|
# REMAINDER arguments convert all values, checking none
|
|
elif action.nargs == REMAINDER:
|
|
value = [self._get_value(action, v) for v in arg_strings]
|
|
|
|
# PARSER arguments convert all values, but check only the first
|
|
elif action.nargs == PARSER:
|
|
value = [self._get_value(action, v) for v in arg_strings]
|
|
self._check_value(action, value[0])
|
|
|
|
# SUPPRESS argument does not put anything in the namespace
|
|
elif action.nargs == SUPPRESS:
|
|
value = SUPPRESS
|
|
|
|
# all other types of nargs produce a list
|
|
else:
|
|
value = [self._get_value(action, v) for v in arg_strings]
|
|
for v in value:
|
|
self._check_value(action, v)
|
|
|
|
# return the converted value
|
|
return value
|
|
|
|
def _get_value(self, action, arg_string):
|
|
type_func = self._registry_get('type', action.type, action.type)
|
|
if not callable(type_func):
|
|
raise TypeError(f'{type_func!r} is not callable')
|
|
|
|
# convert the value to the appropriate type
|
|
try:
|
|
result = type_func(arg_string)
|
|
|
|
# ArgumentTypeErrors indicate errors
|
|
except ArgumentTypeError as err:
|
|
msg = str(err)
|
|
raise ArgumentError(action, msg)
|
|
|
|
# TypeErrors or ValueErrors also indicate errors
|
|
except (TypeError, ValueError):
|
|
name = getattr(action.type, '__name__', repr(action.type))
|
|
args = {'type': name, 'value': arg_string}
|
|
msg = _('invalid %(type)s value: %(value)r')
|
|
raise ArgumentError(action, msg % args)
|
|
|
|
# return the converted value
|
|
return result
|
|
|
|
def _check_value(self, action, value):
|
|
# converted value must be one of the choices (if specified)
|
|
choices = action.choices
|
|
if choices is None:
|
|
return
|
|
|
|
if isinstance(choices, str):
|
|
choices = iter(choices)
|
|
|
|
if value not in choices:
|
|
args = {'value': str(value),
|
|
'choices': ', '.join(map(str, action.choices))}
|
|
msg = _('invalid choice: %(value)r (choose from %(choices)s)')
|
|
|
|
if self.suggest_on_error and isinstance(value, str):
|
|
if all(isinstance(choice, str) for choice in action.choices):
|
|
import difflib
|
|
suggestions = difflib.get_close_matches(value, action.choices, 1)
|
|
if suggestions:
|
|
args['closest'] = suggestions[0]
|
|
msg = _('invalid choice: %(value)r, maybe you meant %(closest)r? '
|
|
'(choose from %(choices)s)')
|
|
|
|
raise ArgumentError(action, msg % args)
|
|
|
|
# =======================
|
|
# Help-formatting methods
|
|
# =======================
|
|
def format_usage(self):
|
|
formatter = self._get_formatter()
|
|
formatter.add_usage(self.usage, self._actions,
|
|
self._mutually_exclusive_groups)
|
|
return formatter.format_help()
|
|
|
|
def format_help(self):
|
|
formatter = self._get_formatter()
|
|
|
|
# usage
|
|
formatter.add_usage(self.usage, self._actions,
|
|
self._mutually_exclusive_groups)
|
|
|
|
# description
|
|
formatter.add_text(self.description)
|
|
|
|
# positionals, optionals and user-defined groups
|
|
for action_group in self._action_groups:
|
|
formatter.start_section(action_group.title)
|
|
formatter.add_text(action_group.description)
|
|
formatter.add_arguments(action_group._group_actions)
|
|
formatter.end_section()
|
|
|
|
# epilog
|
|
formatter.add_text(self.epilog)
|
|
|
|
# determine help from format above
|
|
return formatter.format_help()
|
|
|
|
def _get_formatter(self):
|
|
return self.formatter_class(prog=self.prog)
|
|
|
|
# =====================
|
|
# Help-printing methods
|
|
# =====================
|
|
def print_usage(self, file=None):
|
|
if file is None:
|
|
file = _sys.stdout
|
|
self._print_message(self.format_usage(), file)
|
|
|
|
def print_help(self, file=None):
|
|
if file is None:
|
|
file = _sys.stdout
|
|
self._print_message(self.format_help(), file)
|
|
|
|
def _print_message(self, message, file=None):
|
|
if message:
|
|
file = file or _sys.stderr
|
|
try:
|
|
file.write(message)
|
|
except (AttributeError, OSError):
|
|
pass
|
|
|
|
# ===============
|
|
# Exiting methods
|
|
# ===============
|
|
def exit(self, status=0, message=None):
|
|
if message:
|
|
self._print_message(message, _sys.stderr)
|
|
_sys.exit(status)
|
|
|
|
def error(self, message):
|
|
"""error(message: string)
|
|
|
|
Prints a usage message incorporating the message to stderr and
|
|
exits.
|
|
|
|
If you override this in a subclass, it should not return -- it
|
|
should either exit or raise an exception.
|
|
"""
|
|
self.print_usage(_sys.stderr)
|
|
args = {'prog': self.prog, 'message': message}
|
|
self.exit(2, _('%(prog)s: error: %(message)s\n') % args)
|
|
|
|
def _warning(self, message):
|
|
args = {'prog': self.prog, 'message': message}
|
|
self._print_message(_('%(prog)s: warning: %(message)s\n') % args, _sys.stderr)
|