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@@ -1,2383 +0,0 @@
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-# Author: Steven J. Bethard <steven.bethard@gmail.com>.
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-
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-"""Command-line parsing library
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-
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-This module is an optparse-inspired command-line parsing library that:
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-
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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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-
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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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-
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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', default=sys.stdout, type=argparse.FileType('w'),
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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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- args.log.write('%s' % sum(args.integers))
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- args.log.close()
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-
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-The module contains the following public classes:
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-
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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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-
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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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-
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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.
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-
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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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-
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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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-
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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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-
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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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- '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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- '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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-
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-
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-import collections as _collections
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-import copy as _copy
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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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-import textwrap as _textwrap
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-
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-try:
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- from gettext import gettext, ngettext
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-except ImportError:
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- def gettext(message):
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- return message
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- def ngettext(msg1, msg2, n):
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- return msg1 if n == 1 else msg2
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-_ = gettext
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-
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-
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-SUPPRESS = '==SUPPRESS=='
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-
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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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-# =============================
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-# Utility functions and classes
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-# =============================
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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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-
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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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-
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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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- 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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- arg_strings.append('%s=%r' % (name, value))
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- return '%s(%s)' % (type_name, ', '.join(arg_strings))
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-
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- def _get_kwargs(self):
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- return sorted(self.__dict__.items())
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-
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- def _get_args(self):
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- return []
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-
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-
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-def _ensure_value(namespace, name, value):
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- if getattr(namespace, name, None) is None:
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- setattr(namespace, name, value)
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- return getattr(namespace, name)
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-
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-
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-# ===============
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-# Formatting Help
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-# ===============
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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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-
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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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-
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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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-
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- # default setting for width
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- if width is None:
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- try:
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- width = int(_os.environ['COLUMNS'])
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- except (KeyError, ValueError):
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- width = 80
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- width -= 2
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-
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- self._prog = prog
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- self._indent_increment = indent_increment
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- self._max_help_position = max_help_position
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- self._width = width
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-
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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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-
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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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-
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- self._whitespace_matcher = _re.compile(r'\s+')
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- self._long_break_matcher = _re.compile(r'\n\n\n+')
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-
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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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-
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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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-
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- class _Section(object):
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-
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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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-
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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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- for func, args in self.items:
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- func(*args)
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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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-
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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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-
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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 = '%*s%s:\n' % (current_indent, '', self.heading)
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- else:
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- heading = ''
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-
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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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-
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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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- # ========================
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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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-
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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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-
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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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-
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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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-
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- def add_argument(self, action):
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- if action.help is not SUPPRESS:
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-
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- # find all invocations
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- get_invocation = self._format_action_invocation
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- invocations = [get_invocation(action)]
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- for subaction in self._iter_indented_subactions(action):
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- invocations.append(get_invocation(subaction))
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-
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- # update the maximum item length
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- invocation_length = max([len(s) for s in invocations])
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- action_length = invocation_length + self._current_indent
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- self._action_max_length = max(self._action_max_length,
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- action_length)
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-
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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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-
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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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- # =======================
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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- # break usage into wrappable parts
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- part_regexp = r'\(.*?\)+|\[.*?\]+|\S+'
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- opt_usage = format(optionals, groups)
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- pos_usage = format(positionals, groups)
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- opt_parts = _re.findall(part_regexp, opt_usage)
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- pos_parts = _re.findall(part_regexp, pos_usage)
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- assert ' '.join(opt_parts) == opt_usage
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- assert ' '.join(pos_parts) == pos_usage
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-
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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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- 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 = len(indent) - 1
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- for part in parts:
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- if line_len + 1 + len(part) > text_width:
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- lines.append(indent + ' '.join(line))
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- line = []
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- line_len = len(indent) - 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][len(indent):]
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- return lines
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-
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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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-
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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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-
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- # join lines into usage
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- usage = '\n'.join(lines)
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-
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- # prefix with 'usage:'
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- return '%s%s\n\n' % (prefix, usage)
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-
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- def _format_actions_usage(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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- try:
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- start = actions.index(group._group_actions[0])
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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 actions[start:end] == group._group_actions:
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- for action in group._group_actions:
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- group_actions.add(action)
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- if not group.required:
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- if start in inserts:
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- inserts[start] += ' ['
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- else:
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- inserts[start] = '['
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- inserts[end] = ']'
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- else:
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- if start in inserts:
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- inserts[start] += ' ('
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- else:
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- inserts[start] = '('
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- inserts[end] = ')'
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- for i in range(start + 1, end):
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- inserts[i] = '|'
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-
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- # collect all actions format strings
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- parts = []
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- for i, action in enumerate(actions):
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-
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- # suppressed arguments are marked with None
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- # remove | separators for suppressed arguments
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- if action.help is SUPPRESS:
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- parts.append(None)
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- if inserts.get(i) == '|':
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- inserts.pop(i)
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|
|
- elif inserts.get(i + 1) == '|':
|
|
|
- inserts.pop(i + 1)
|
|
|
-
|
|
|
- # produce all arg strings
|
|
|
- elif not action.option_strings:
|
|
|
- part = self._format_args(action, action.dest)
|
|
|
-
|
|
|
- # if it's in a group, strip the outer []
|
|
|
- if action in group_actions:
|
|
|
- if part[0] == '[' and part[-1] == ']':
|
|
|
- part = part[1:-1]
|
|
|
-
|
|
|
- # add the action string to the list
|
|
|
- parts.append(part)
|
|
|
-
|
|
|
- # produce the first way to invoke the option in brackets
|
|
|
- else:
|
|
|
- option_string = action.option_strings[0]
|
|
|
-
|
|
|
- # if the Optional doesn't take a value, format is:
|
|
|
- # -s or --long
|
|
|
- if action.nargs == 0:
|
|
|
- part = '%s' % option_string
|
|
|
-
|
|
|
- # if the Optional takes a value, format is:
|
|
|
- # -s ARGS or --long ARGS
|
|
|
- else:
|
|
|
- default = action.dest.upper()
|
|
|
- args_string = self._format_args(action, default)
|
|
|
- part = '%s %s' % (option_string, args_string)
|
|
|
-
|
|
|
- # make it look optional if it's not required or in a group
|
|
|
- if not action.required and action not in group_actions:
|
|
|
- part = '[%s]' % part
|
|
|
-
|
|
|
- # add the action string to the list
|
|
|
- parts.append(part)
|
|
|
-
|
|
|
- # insert things at the necessary indices
|
|
|
- for i in sorted(inserts, reverse=True):
|
|
|
- parts[i:i] = [inserts[i]]
|
|
|
-
|
|
|
- # join all the action items with spaces
|
|
|
- text = ' '.join([item for item in parts if item is not None])
|
|
|
-
|
|
|
- # clean up separators for mutually exclusive groups
|
|
|
- open = r'[\[(]'
|
|
|
- close = r'[\])]'
|
|
|
- text = _re.sub(r'(%s) ' % open, r'\1', text)
|
|
|
- text = _re.sub(r' (%s)' % close, r'\1', text)
|
|
|
- text = _re.sub(r'%s *%s' % (open, close), r'', text)
|
|
|
- text = _re.sub(r'\(([^|]*)\)', r'\1', text)
|
|
|
- text = text.strip()
|
|
|
-
|
|
|
- # return the text
|
|
|
- return text
|
|
|
-
|
|
|
- def _format_text(self, text):
|
|
|
- if '%(prog)' in text:
|
|
|
- text = text % dict(prog=self._prog)
|
|
|
- text_width = self._width - self._current_indent
|
|
|
- indent = ' ' * self._current_indent
|
|
|
- return self._fill_text(text, text_width, indent) + '\n\n'
|
|
|
-
|
|
|
- def _format_action(self, action):
|
|
|
- # determine the required width and the entry label
|
|
|
- help_position = min(self._action_max_length + 2,
|
|
|
- self._max_help_position)
|
|
|
- help_width = self._width - help_position
|
|
|
- action_width = help_position - self._current_indent - 2
|
|
|
- action_header = self._format_action_invocation(action)
|
|
|
-
|
|
|
- # ho nelp; start on same line and add a final newline
|
|
|
- if not action.help:
|
|
|
- tup = self._current_indent, '', action_header
|
|
|
- action_header = '%*s%s\n' % tup
|
|
|
-
|
|
|
- # short action name; start on the same line and pad two spaces
|
|
|
- elif len(action_header) <= action_width:
|
|
|
- tup = self._current_indent, '', action_width, action_header
|
|
|
- action_header = '%*s%-*s ' % tup
|
|
|
- indent_first = 0
|
|
|
-
|
|
|
- # long action name; start on the next line
|
|
|
- else:
|
|
|
- tup = self._current_indent, '', action_header
|
|
|
- action_header = '%*s%s\n' % tup
|
|
|
- indent_first = help_position
|
|
|
-
|
|
|
- # collect the pieces of the action help
|
|
|
- parts = [action_header]
|
|
|
-
|
|
|
- # if there was help for the action, add lines of help text
|
|
|
- if action.help:
|
|
|
- help_text = self._expand_help(action)
|
|
|
- help_lines = self._split_lines(help_text, help_width)
|
|
|
- parts.append('%*s%s\n' % (indent_first, '', help_lines[0]))
|
|
|
- for line in help_lines[1:]:
|
|
|
- parts.append('%*s%s\n' % (help_position, '', line))
|
|
|
-
|
|
|
- # or add a newline if the description doesn't end with one
|
|
|
- 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:
|
|
|
- metavar, = self._metavar_formatter(action, action.dest)(1)
|
|
|
- return metavar
|
|
|
-
|
|
|
- else:
|
|
|
- parts = []
|
|
|
-
|
|
|
- # if the Optional doesn't take a value, format is:
|
|
|
- # -s, --long
|
|
|
- if action.nargs == 0:
|
|
|
- parts.extend(action.option_strings)
|
|
|
-
|
|
|
- # if the Optional takes a value, format is:
|
|
|
- # -s ARGS, --long ARGS
|
|
|
- else:
|
|
|
- default = action.dest.upper()
|
|
|
- args_string = self._format_args(action, default)
|
|
|
- for option_string in action.option_strings:
|
|
|
- parts.append('%s %s' % (option_string, args_string))
|
|
|
-
|
|
|
- return ', '.join(parts)
|
|
|
-
|
|
|
- def _metavar_formatter(self, action, default_metavar):
|
|
|
- if action.metavar is not None:
|
|
|
- result = action.metavar
|
|
|
- elif action.choices is not None:
|
|
|
- choice_strs = [str(choice) for choice in action.choices]
|
|
|
- result = '{%s}' % ','.join(choice_strs)
|
|
|
- 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:
|
|
|
- result = '[%s [%s ...]]' % get_metavar(2)
|
|
|
- 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)
|
|
|
- else:
|
|
|
- formats = ['%s' for _ in range(action.nargs)]
|
|
|
- result = ' '.join(formats) % get_metavar(action.nargs)
|
|
|
- return result
|
|
|
-
|
|
|
- def _expand_help(self, action):
|
|
|
- params = dict(vars(action), prog=self._prog)
|
|
|
- for name in list(params):
|
|
|
- if params[name] is SUPPRESS:
|
|
|
- del params[name]
|
|
|
- for name in list(params):
|
|
|
- if hasattr(params[name], '__name__'):
|
|
|
- params[name] = params[name].__name__
|
|
|
- if params.get('choices') is not None:
|
|
|
- choices_str = ', '.join([str(c) for c in params['choices']])
|
|
|
- params['choices'] = choices_str
|
|
|
- return self._get_help_string(action) % params
|
|
|
-
|
|
|
- def _iter_indented_subactions(self, action):
|
|
|
- try:
|
|
|
- get_subactions = action._get_subactions
|
|
|
- except AttributeError:
|
|
|
- pass
|
|
|
- else:
|
|
|
- self._indent()
|
|
|
- for subaction in get_subactions():
|
|
|
- yield subaction
|
|
|
- self._dedent()
|
|
|
-
|
|
|
- def _split_lines(self, text, width):
|
|
|
- text = self._whitespace_matcher.sub(' ', text).strip()
|
|
|
- return _textwrap.wrap(text, width)
|
|
|
-
|
|
|
- def _fill_text(self, text, width, indent):
|
|
|
- text = self._whitespace_matcher.sub(' ', text).strip()
|
|
|
- return _textwrap.fill(text, width, initial_indent=indent,
|
|
|
- subsequent_indent=indent)
|
|
|
-
|
|
|
- def _get_help_string(self, action):
|
|
|
- return action.help
|
|
|
-
|
|
|
-
|
|
|
-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(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 '%(default)' not in action.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
|
|
|
-
|
|
|
-
|
|
|
-# =====================
|
|
|
-# 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):
|
|
|
- return argument.metavar
|
|
|
- elif argument.dest not in (None, SUPPRESS):
|
|
|
- return argument.dest
|
|
|
- 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):
|
|
|
- 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
|
|
|
-
|
|
|
- def _get_kwargs(self):
|
|
|
- names = [
|
|
|
- 'option_strings',
|
|
|
- 'dest',
|
|
|
- 'nargs',
|
|
|
- 'const',
|
|
|
- 'default',
|
|
|
- 'type',
|
|
|
- 'choices',
|
|
|
- 'help',
|
|
|
- 'metavar',
|
|
|
- ]
|
|
|
- return [(name, getattr(self, name)) for name in names]
|
|
|
-
|
|
|
- def __call__(self, parser, namespace, values, option_string=None):
|
|
|
- raise NotImplementedError(_('.__call__() not defined'))
|
|
|
-
|
|
|
-
|
|
|
-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):
|
|
|
- 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)
|
|
|
-
|
|
|
- def __call__(self, parser, namespace, values, option_string=None):
|
|
|
- setattr(namespace, self.dest, values)
|
|
|
-
|
|
|
-
|
|
|
-class _StoreConstAction(Action):
|
|
|
-
|
|
|
- def __init__(self,
|
|
|
- option_strings,
|
|
|
- dest,
|
|
|
- const,
|
|
|
- default=None,
|
|
|
- required=False,
|
|
|
- help=None,
|
|
|
- metavar=None):
|
|
|
- super(_StoreConstAction, self).__init__(
|
|
|
- option_strings=option_strings,
|
|
|
- dest=dest,
|
|
|
- nargs=0,
|
|
|
- const=const,
|
|
|
- default=default,
|
|
|
- required=required,
|
|
|
- help=help)
|
|
|
-
|
|
|
- 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):
|
|
|
- super(_StoreTrueAction, self).__init__(
|
|
|
- option_strings=option_strings,
|
|
|
- dest=dest,
|
|
|
- const=True,
|
|
|
- default=default,
|
|
|
- required=required,
|
|
|
- help=help)
|
|
|
-
|
|
|
-
|
|
|
-class _StoreFalseAction(_StoreConstAction):
|
|
|
-
|
|
|
- def __init__(self,
|
|
|
- option_strings,
|
|
|
- dest,
|
|
|
- default=True,
|
|
|
- required=False,
|
|
|
- help=None):
|
|
|
- super(_StoreFalseAction, self).__init__(
|
|
|
- option_strings=option_strings,
|
|
|
- dest=dest,
|
|
|
- const=False,
|
|
|
- default=default,
|
|
|
- required=required,
|
|
|
- help=help)
|
|
|
-
|
|
|
-
|
|
|
-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):
|
|
|
- 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)
|
|
|
-
|
|
|
- def __call__(self, parser, namespace, values, option_string=None):
|
|
|
- items = _copy.copy(_ensure_value(namespace, self.dest, []))
|
|
|
- items.append(values)
|
|
|
- setattr(namespace, self.dest, items)
|
|
|
-
|
|
|
-
|
|
|
-class _AppendConstAction(Action):
|
|
|
-
|
|
|
- def __init__(self,
|
|
|
- option_strings,
|
|
|
- dest,
|
|
|
- const,
|
|
|
- default=None,
|
|
|
- required=False,
|
|
|
- help=None,
|
|
|
- metavar=None):
|
|
|
- super(_AppendConstAction, self).__init__(
|
|
|
- option_strings=option_strings,
|
|
|
- dest=dest,
|
|
|
- nargs=0,
|
|
|
- const=const,
|
|
|
- default=default,
|
|
|
- required=required,
|
|
|
- help=help,
|
|
|
- metavar=metavar)
|
|
|
-
|
|
|
- def __call__(self, parser, namespace, values, option_string=None):
|
|
|
- items = _copy.copy(_ensure_value(namespace, self.dest, []))
|
|
|
- items.append(self.const)
|
|
|
- setattr(namespace, self.dest, items)
|
|
|
-
|
|
|
-
|
|
|
-class _CountAction(Action):
|
|
|
-
|
|
|
- def __init__(self,
|
|
|
- option_strings,
|
|
|
- dest,
|
|
|
- default=None,
|
|
|
- required=False,
|
|
|
- help=None):
|
|
|
- super(_CountAction, self).__init__(
|
|
|
- option_strings=option_strings,
|
|
|
- dest=dest,
|
|
|
- nargs=0,
|
|
|
- default=default,
|
|
|
- required=required,
|
|
|
- help=help)
|
|
|
-
|
|
|
- def __call__(self, parser, namespace, values, option_string=None):
|
|
|
- new_count = _ensure_value(namespace, self.dest, 0) + 1
|
|
|
- setattr(namespace, self.dest, new_count)
|
|
|
-
|
|
|
-
|
|
|
-class _HelpAction(Action):
|
|
|
-
|
|
|
- def __init__(self,
|
|
|
- option_strings,
|
|
|
- dest=SUPPRESS,
|
|
|
- default=SUPPRESS,
|
|
|
- help=None):
|
|
|
- super(_HelpAction, self).__init__(
|
|
|
- option_strings=option_strings,
|
|
|
- dest=dest,
|
|
|
- default=default,
|
|
|
- nargs=0,
|
|
|
- help=help)
|
|
|
-
|
|
|
- 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="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.exit(message=formatter.format_help())
|
|
|
-
|
|
|
-
|
|
|
-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,
|
|
|
- help=None,
|
|
|
- metavar=None):
|
|
|
-
|
|
|
- self._prog_prefix = prog
|
|
|
- self._parser_class = parser_class
|
|
|
- self._name_parser_map = _collections.OrderedDict()
|
|
|
- self._choices_actions = []
|
|
|
-
|
|
|
- super(_SubParsersAction, self).__init__(
|
|
|
- option_strings=option_strings,
|
|
|
- dest=dest,
|
|
|
- nargs=PARSER,
|
|
|
- choices=self._name_parser_map,
|
|
|
- help=help,
|
|
|
- metavar=metavar)
|
|
|
-
|
|
|
- def add_parser(self, name, **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', ())
|
|
|
-
|
|
|
- # 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)
|
|
|
-
|
|
|
- # create the parser and add it to the map
|
|
|
- parser = self._parser_class(**kwargs)
|
|
|
- self._name_parser_map[name] = parser
|
|
|
-
|
|
|
- # make parser available under aliases also
|
|
|
- for alias in aliases:
|
|
|
- self._name_parser_map[alias] = parser
|
|
|
-
|
|
|
- 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:
|
|
|
- parser = 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)
|
|
|
-
|
|
|
- # 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
|
|
|
- namespace, arg_strings = parser.parse_known_args(arg_strings, namespace)
|
|
|
- if arg_strings:
|
|
|
- vars(namespace).setdefault(_UNRECOGNIZED_ARGS_ATTR, [])
|
|
|
- getattr(namespace, _UNRECOGNIZED_ARGS_ATTR).extend(arg_strings)
|
|
|
-
|
|
|
-
|
|
|
-# ==============
|
|
|
-# Type classes
|
|
|
-# ==============
|
|
|
-
|
|
|
-class FileType(object):
|
|
|
- """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.
|
|
|
- """
|
|
|
-
|
|
|
- def __init__(self, mode='r', bufsize=-1):
|
|
|
- self._mode = mode
|
|
|
- self._bufsize = bufsize
|
|
|
-
|
|
|
- def __call__(self, string):
|
|
|
- # the special argument "-" means sys.std{in,out}
|
|
|
- if string == '-':
|
|
|
- if 'r' in self._mode:
|
|
|
- return _sys.stdin
|
|
|
- elif 'w' in self._mode:
|
|
|
- return _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)
|
|
|
- except IOError as e:
|
|
|
- message = _("can't open '%s': %s")
|
|
|
- raise ArgumentTypeError(message % (string, e))
|
|
|
-
|
|
|
- def __repr__(self):
|
|
|
- args = self._mode, self._bufsize
|
|
|
- args_str = ', '.join(repr(arg) for arg in args if arg != -1)
|
|
|
- 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):
|
|
|
- return vars(self) == vars(other)
|
|
|
-
|
|
|
- def __ne__(self, other):
|
|
|
- return not (self == 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)
|
|
|
-
|
|
|
- # 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+$|^-\d*\.\d+$')
|
|
|
-
|
|
|
- # 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 ValueError('dest supplied twice for positional argument')
|
|
|
- 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_class = self._pop_action_class(kwargs)
|
|
|
- if not callable(action_class):
|
|
|
- raise ValueError('unknown action "%s"' % (action_class,))
|
|
|
- action = action_class(**kwargs)
|
|
|
-
|
|
|
- # 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 ValueError('%r is not callable' % (type_func,))
|
|
|
-
|
|
|
- # raise an error if the metavar does not match the type
|
|
|
- if hasattr(self, "_get_formatter"):
|
|
|
- try:
|
|
|
- self._get_formatter()._format_args(action, None)
|
|
|
- except TypeError:
|
|
|
- raise ValueError("length of metavar tuple does not match nargs")
|
|
|
-
|
|
|
- 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:
|
|
|
- msg = _('cannot merge actions - two groups are named %r')
|
|
|
- raise ValueError(msg % (group.title))
|
|
|
- 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:
|
|
|
- mutex_group = self.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
|
|
|
- if kwargs.get('nargs') not in [OPTIONAL, ZERO_OR_MORE]:
|
|
|
- kwargs['required'] = True
|
|
|
- if kwargs.get('nargs') == ZERO_OR_MORE and 'default' not in kwargs:
|
|
|
- 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:
|
|
|
- args = {'option': option_string,
|
|
|
- 'prefix_chars': self.prefix_chars}
|
|
|
- msg = _('invalid option string %(option)r: '
|
|
|
- 'must start with a character %(prefix_chars)r')
|
|
|
- raise ValueError(msg % args)
|
|
|
-
|
|
|
- # strings starting with two prefix characters are long options
|
|
|
- option_strings.append(option_string)
|
|
|
- if option_string[0] in self.prefix_chars:
|
|
|
- if len(option_string) > 1:
|
|
|
- if 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 = _('dest= is required for options like %r')
|
|
|
- raise ValueError(msg % option_string)
|
|
|
- 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 = _('invalid conflict_resolution value: %r')
|
|
|
- raise ValueError(msg % self.conflict_handler)
|
|
|
-
|
|
|
- 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)
|
|
|
-
|
|
|
-
|
|
|
-class _ArgumentGroup(_ActionsContainer):
|
|
|
-
|
|
|
- def __init__(self, container, title=None, description=None, **kwargs):
|
|
|
- # 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)
|
|
|
-
|
|
|
-
|
|
|
-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)
|
|
|
-
|
|
|
-
|
|
|
-class ArgumentParser(_AttributeHolder, _ActionsContainer):
|
|
|
- """Object for parsing command line strings into Python objects.
|
|
|
-
|
|
|
- Keyword Arguments:
|
|
|
- - prog -- The name of the program (default: 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
|
|
|
- """
|
|
|
-
|
|
|
- def __init__(self,
|
|
|
- prog=None,
|
|
|
- usage=None,
|
|
|
- description=None,
|
|
|
- epilog=None,
|
|
|
- version=None,
|
|
|
- parents=[],
|
|
|
- formatter_class=HelpFormatter,
|
|
|
- prefix_chars='-',
|
|
|
- fromfile_prefix_chars=None,
|
|
|
- argument_default=None,
|
|
|
- conflict_handler='error',
|
|
|
- add_help=True):
|
|
|
-
|
|
|
- if version is not None:
|
|
|
- import warnings
|
|
|
- warnings.warn(
|
|
|
- """The "version" argument to ArgumentParser is deprecated. """
|
|
|
- """Please use """
|
|
|
- """"add_argument(..., action='version', version="N", ...)" """
|
|
|
- """instead""", DeprecationWarning)
|
|
|
-
|
|
|
- superinit = super(ArgumentParser, self).__init__
|
|
|
- superinit(description=description,
|
|
|
- prefix_chars=prefix_chars,
|
|
|
- argument_default=argument_default,
|
|
|
- conflict_handler=conflict_handler)
|
|
|
-
|
|
|
- # default setting for prog
|
|
|
- if prog is None:
|
|
|
- prog = _os.path.basename(_sys.argv[0])
|
|
|
-
|
|
|
- self.prog = prog
|
|
|
- self.usage = usage
|
|
|
- self.epilog = epilog
|
|
|
- self.version = version
|
|
|
- self.formatter_class = formatter_class
|
|
|
- self.fromfile_prefix_chars = fromfile_prefix_chars
|
|
|
- self.add_help = add_help
|
|
|
-
|
|
|
- add_group = self.add_argument_group
|
|
|
- self._positionals = add_group(_('positional arguments'))
|
|
|
- self._optionals = add_group(_('optional arguments'))
|
|
|
- self._subparsers = None
|
|
|
-
|
|
|
- # register types
|
|
|
- def identity(string):
|
|
|
- return string
|
|
|
- self.register('type', None, identity)
|
|
|
-
|
|
|
- # add help and version arguments 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'))
|
|
|
- if self.version:
|
|
|
- self.add_argument(
|
|
|
- default_prefix+'v', default_prefix*2+'version',
|
|
|
- action='version', default=SUPPRESS,
|
|
|
- version=self.version,
|
|
|
- help=_("show program's version number and exit"))
|
|
|
-
|
|
|
- # add parent arguments and defaults
|
|
|
- for parent in parents:
|
|
|
- self._add_container_actions(parent)
|
|
|
- try:
|
|
|
- defaults = parent._defaults
|
|
|
- except AttributeError:
|
|
|
- pass
|
|
|
- else:
|
|
|
- self._defaults.update(defaults)
|
|
|
-
|
|
|
- # =======================
|
|
|
- # Pretty __repr__ methods
|
|
|
- # =======================
|
|
|
- def _get_kwargs(self):
|
|
|
- names = [
|
|
|
- 'prog',
|
|
|
- 'usage',
|
|
|
- 'description',
|
|
|
- 'version',
|
|
|
- '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:
|
|
|
- self.error(_('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(self.usage, 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._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')
|
|
|
- self.error(msg % ' '.join(argv))
|
|
|
- return args
|
|
|
-
|
|
|
- def parse_known_args(self, args=None, namespace=None):
|
|
|
- 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
|
|
|
- try:
|
|
|
- namespace, args = self._parse_known_args(args, namespace)
|
|
|
- if hasattr(namespace, _UNRECOGNIZED_ARGS_ATTR):
|
|
|
- args.extend(getattr(namespace, _UNRECOGNIZED_ARGS_ATTR))
|
|
|
- delattr(namespace, _UNRECOGNIZED_ARGS_ATTR)
|
|
|
- return namespace, args
|
|
|
- except ArgumentError:
|
|
|
- err = _sys.exc_info()[1]
|
|
|
- self.error(str(err))
|
|
|
-
|
|
|
- def _parse_known_args(self, arg_strings, namespace):
|
|
|
- # 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_tuple = self._parse_optional(arg_string)
|
|
|
- if option_tuple is None:
|
|
|
- pattern = 'A'
|
|
|
- else:
|
|
|
- option_string_indices[i] = option_tuple
|
|
|
- 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()
|
|
|
-
|
|
|
- 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, assuming that actions that use the default
|
|
|
- # value don't really count as "present"
|
|
|
- if argument_values is not action.default:
|
|
|
- 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_tuple = option_string_indices[start_index]
|
|
|
- action, option_string, explicit_arg = option_tuple
|
|
|
-
|
|
|
- # 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])
|
|
|
- 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:
|
|
|
- action_tuples.append((action, [], option_string))
|
|
|
- char = option_string[0]
|
|
|
- option_string = char + explicit_arg[0]
|
|
|
- new_explicit_arg = explicit_arg[1:] or None
|
|
|
- optionals_map = self._option_string_actions
|
|
|
- if option_string in optionals_map:
|
|
|
- action = optionals_map[option_string]
|
|
|
- explicit_arg = new_explicit_arg
|
|
|
- else:
|
|
|
- msg = _('ignored explicit argument %r')
|
|
|
- raise ArgumentError(action, msg % explicit_arg)
|
|
|
-
|
|
|
- # 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:
|
|
|
- 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]
|
|
|
- start_index += arg_count
|
|
|
- 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 = []
|
|
|
- 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 = min([
|
|
|
- index
|
|
|
- for index in option_string_indices
|
|
|
- if index >= start_index])
|
|
|
- if 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)
|
|
|
- start_index = next_option_string_index
|
|
|
-
|
|
|
- # consume the next optional and any arguments for it
|
|
|
- start_index = consume_optional(start_index)
|
|
|
-
|
|
|
- # 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:])
|
|
|
-
|
|
|
- # if we didn't use all the Positional objects, there were too few
|
|
|
- # arg strings supplied.
|
|
|
- if positionals:
|
|
|
- self.error(_('too few arguments'))
|
|
|
-
|
|
|
- # make sure all required actions were present, and convert defaults.
|
|
|
- for action in self._actions:
|
|
|
- if action not in seen_actions:
|
|
|
- if action.required:
|
|
|
- name = _get_action_name(action)
|
|
|
- self.error(_('argument %s is required') % name)
|
|
|
- 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))
|
|
|
-
|
|
|
- # 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')
|
|
|
- self.error(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:
|
|
|
- args_file = open(arg_string[1:])
|
|
|
- try:
|
|
|
- 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)
|
|
|
- finally:
|
|
|
- args_file.close()
|
|
|
- except IOError:
|
|
|
- err = _sys.exc_info()[1]
|
|
|
- self.error(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'),
|
|
|
- }
|
|
|
- default = ngettext('expected %s argument',
|
|
|
- 'expected %s arguments',
|
|
|
- action.nargs) % action.nargs
|
|
|
- msg = nargs_errors.get(action.nargs, default)
|
|
|
- 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
|
|
|
- result = []
|
|
|
- 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.extend([len(string) for string in match.groups()])
|
|
|
- break
|
|
|
-
|
|
|
- # return the list of arg string counts
|
|
|
- return result
|
|
|
-
|
|
|
- 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
|
|
|
-
|
|
|
- # 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
|
|
|
- if '=' in arg_string:
|
|
|
- option_string, explicit_arg = arg_string.split('=', 1)
|
|
|
- if option_string in self._option_string_actions:
|
|
|
- action = self._option_string_actions[option_string]
|
|
|
- return action, option_string, explicit_arg
|
|
|
-
|
|
|
- # 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 multiple actions match, the option string was ambiguous
|
|
|
- if len(option_tuples) > 1:
|
|
|
- options = ', '.join([option_string
|
|
|
- for action, option_string, explicit_arg in option_tuples])
|
|
|
- args = {'option': arg_string, 'matches': options}
|
|
|
- msg = _('ambiguous option: %(option)s could match %(matches)s')
|
|
|
- self.error(msg % args)
|
|
|
-
|
|
|
- # if exactly one action matched, this segmentation is good,
|
|
|
- # so return the parsed action
|
|
|
- elif len(option_tuples) == 1:
|
|
|
- option_tuple, = option_tuples
|
|
|
- return option_tuple
|
|
|
-
|
|
|
- # 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
|
|
|
-
|
|
|
- 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 '=' in option_string:
|
|
|
- option_prefix, explicit_arg = option_string.split('=', 1)
|
|
|
- else:
|
|
|
- option_prefix = option_string
|
|
|
- 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, 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 = option_string
|
|
|
- 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 option_string.startswith(option_prefix):
|
|
|
- action = self._option_string_actions[option_string]
|
|
|
- tup = action, option_string, explicit_arg
|
|
|
- result.append(tup)
|
|
|
-
|
|
|
- # shouldn't ever get here
|
|
|
- else:
|
|
|
- self.error(_('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
|
|
|
-
|
|
|
- # the default (None) is assumed to be a single argument
|
|
|
- if nargs is None:
|
|
|
- nargs_pattern = '(-*A-*)'
|
|
|
-
|
|
|
- # allow zero or one arguments
|
|
|
- elif nargs == OPTIONAL:
|
|
|
- nargs_pattern = '(-*A?-*)'
|
|
|
-
|
|
|
- # allow zero or more arguments
|
|
|
- elif nargs == ZERO_OR_MORE:
|
|
|
- nargs_pattern = '(-*[A-]*)'
|
|
|
-
|
|
|
- # allow one or more arguments
|
|
|
- elif nargs == ONE_OR_MORE:
|
|
|
- nargs_pattern = '(-*A[A-]*)'
|
|
|
-
|
|
|
- # allow any number of options or arguments
|
|
|
- elif nargs == REMAINDER:
|
|
|
- nargs_pattern = '([-AO]*)'
|
|
|
-
|
|
|
- # allow one argument followed by any number of options or arguments
|
|
|
- elif nargs == PARSER:
|
|
|
- nargs_pattern = '(-*A[-AO]*)'
|
|
|
-
|
|
|
- # all others should be integers
|
|
|
- else:
|
|
|
- nargs_pattern = '(-*%s-*)' % '-*'.join('A' * nargs)
|
|
|
-
|
|
|
- # if this is an optional action, -- is not allowed
|
|
|
- if action.option_strings:
|
|
|
- nargs_pattern = nargs_pattern.replace('-*', '')
|
|
|
- nargs_pattern = nargs_pattern.replace('-', '')
|
|
|
-
|
|
|
- # return the pattern
|
|
|
- return nargs_pattern
|
|
|
-
|
|
|
- # ========================
|
|
|
- # Value conversion methods
|
|
|
- # ========================
|
|
|
- def _get_values(self, action, arg_strings):
|
|
|
- # for everything but PARSER, REMAINDER args, strip out first '--'
|
|
|
- if action.nargs not in [PARSER, REMAINDER]:
|
|
|
- try:
|
|
|
- arg_strings.remove('--')
|
|
|
- except ValueError:
|
|
|
- pass
|
|
|
-
|
|
|
- # 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):
|
|
|
- value = self._get_value(action, value)
|
|
|
- self._check_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 = arg_strings
|
|
|
- self._check_value(action, 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])
|
|
|
-
|
|
|
- # 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):
|
|
|
- msg = _('%r is not callable')
|
|
|
- raise ArgumentError(action, msg % type_func)
|
|
|
-
|
|
|
- # convert the value to the appropriate type
|
|
|
- try:
|
|
|
- result = type_func(arg_string)
|
|
|
-
|
|
|
- # ArgumentTypeErrors indicate errors
|
|
|
- except ArgumentTypeError:
|
|
|
- name = getattr(action.type, '__name__', repr(action.type))
|
|
|
- msg = str(_sys.exc_info()[1])
|
|
|
- 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)
|
|
|
- if action.choices is not None and value not in action.choices:
|
|
|
- args = {'value': value,
|
|
|
- 'choices': ', '.join(map(repr, action.choices))}
|
|
|
- msg = _('invalid choice: %(value)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 format_version(self):
|
|
|
- import warnings
|
|
|
- warnings.warn(
|
|
|
- 'The format_version method is deprecated -- the "version" '
|
|
|
- 'argument to ArgumentParser is no longer supported.',
|
|
|
- DeprecationWarning)
|
|
|
- formatter = self._get_formatter()
|
|
|
- formatter.add_text(self.version)
|
|
|
- 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_version(self, file=None):
|
|
|
- import warnings
|
|
|
- warnings.warn(
|
|
|
- 'The print_version method is deprecated -- the "version" '
|
|
|
- 'argument to ArgumentParser is no longer supported.',
|
|
|
- DeprecationWarning)
|
|
|
- self._print_message(self.format_version(), file)
|
|
|
-
|
|
|
- def _print_message(self, message, file=None):
|
|
|
- if message:
|
|
|
- if file is None:
|
|
|
- file = _sys.stderr
|
|
|
- file.write(message)
|
|
|
-
|
|
|
- # ===============
|
|
|
- # 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)
|
TW