2377 lines
87 KiB
Python
2377 lines
87 KiB
Python
# Author: Steven J. Bethard <steven.bethard@gmail.com>.
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"""Command-line parsing library
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This module is an optparse-inspired command-line parsing library that:
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- handles both optional and positional arguments
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- produces highly informative usage messages
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- supports parsers that dispatch to sub-parsers
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The following is a simple usage example that sums integers from the
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command-line and writes the result to a file::
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parser = argparse.ArgumentParser(
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description='sum the integers at the command line')
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parser.add_argument(
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'integers', metavar='int', nargs='+', type=int,
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help='an integer to be summed')
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parser.add_argument(
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'--log', 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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The module contains the following public classes:
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- ArgumentParser -- The main entry point for command-line parsing. As the
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example above shows, the add_argument() method is used to populate
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the parser with actions for optional and positional arguments. Then
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the parse_args() method is invoked to convert the args at the
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command-line into an object with attributes.
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- ArgumentError -- The exception raised by ArgumentParser objects when
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there are errors with the parser's actions. Errors raised while
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parsing the command-line are caught by ArgumentParser and emitted
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as command-line messages.
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- FileType -- A factory for defining types of files to be created. As the
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example above shows, instances of FileType are typically passed as
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the type= argument of add_argument() calls.
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- Action -- The base class for parser actions. Typically actions are
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selected by passing strings like 'store_true' or 'append_const' to
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the action= argument of add_argument(). However, for greater
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customization of ArgumentParser actions, subclasses of Action may
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be defined and passed as the action= argument.
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- HelpFormatter, RawDescriptionHelpFormatter, RawTextHelpFormatter,
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ArgumentDefaultsHelpFormatter -- Formatter classes which
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may be passed as the formatter_class= argument to the
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ArgumentParser constructor. HelpFormatter is the default,
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RawDescriptionHelpFormatter and RawTextHelpFormatter tell the parser
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not to change the formatting for help text, and
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ArgumentDefaultsHelpFormatter adds information about argument defaults
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to the help.
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All other classes in this module are considered implementation details.
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(Also note that HelpFormatter and RawDescriptionHelpFormatter are only
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considered public as object names -- the API of the formatter objects is
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still considered an implementation detail.)
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"""
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__version__ = '1.1'
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__all__ = [
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'ArgumentParser',
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'ArgumentError',
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'ArgumentTypeError',
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'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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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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from gettext import gettext as _, ngettext
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SUPPRESS = '==SUPPRESS=='
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OPTIONAL = '?'
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ZERO_OR_MORE = '*'
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ONE_OR_MORE = '+'
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PARSER = 'A...'
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REMAINDER = '...'
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_UNRECOGNIZED_ARGS_ATTR = '_unrecognized_args'
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# =============================
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# Utility functions and classes
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# =============================
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class _AttributeHolder(object):
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"""Abstract base class that provides __repr__.
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The __repr__ method returns a string in the format::
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ClassName(attr=name, attr=name, ...)
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The attributes are determined either by a class-level attribute,
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'_kwarg_names', or by inspecting the instance __dict__.
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"""
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def __repr__(self):
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type_name = type(self).__name__
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arg_strings = []
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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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def _get_kwargs(self):
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return sorted(self.__dict__.items())
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def _get_args(self):
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return []
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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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# Formatting Help
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# ===============
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class HelpFormatter(object):
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"""Formatter for generating usage messages and argument help strings.
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Only the name of this class is considered a public API. All the methods
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provided by the class are considered an implementation detail.
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"""
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def __init__(self,
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prog,
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indent_increment=2,
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max_help_position=24,
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width=None):
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# default setting for width
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if width is None:
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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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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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self._current_indent = 0
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self._level = 0
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self._action_max_length = 0
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self._root_section = self._Section(self, None)
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self._current_section = self._root_section
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self._whitespace_matcher = _re.compile(r'\s+')
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self._long_break_matcher = _re.compile(r'\n\n\n+')
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# ===============================
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# Section and indentation methods
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# ===============================
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def _indent(self):
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self._current_indent += self._indent_increment
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self._level += 1
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def _dedent(self):
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self._current_indent -= self._indent_increment
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assert self._current_indent >= 0, 'Indent decreased below 0.'
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self._level -= 1
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class _Section(object):
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def __init__(self, formatter, parent, heading=None):
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self.formatter = formatter
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self.parent = parent
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self.heading = heading
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self.items = []
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def format_help(self):
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# format the indented section
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if self.parent is not None:
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self.formatter._indent()
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join = self.formatter._join_parts
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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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# return nothing if the section was empty
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if not item_help:
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return ''
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# add the heading if the section was non-empty
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if self.heading is not SUPPRESS and self.heading is not None:
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current_indent = self.formatter._current_indent
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heading = '%*s%s:\n' % (current_indent, '', self.heading)
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else:
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heading = ''
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# join the section-initial newline, the heading and the help
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return join(['\n', heading, item_help, '\n'])
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def _add_item(self, func, args):
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self._current_section.items.append((func, args))
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# ========================
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# Message building methods
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# ========================
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def start_section(self, heading):
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self._indent()
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section = self._Section(self, self._current_section, heading)
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self._add_item(section.format_help, [])
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self._current_section = section
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def end_section(self):
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self._current_section = self._current_section.parent
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self._dedent()
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def add_text(self, text):
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if text is not SUPPRESS and text is not None:
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self._add_item(self._format_text, [text])
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def add_usage(self, usage, actions, groups, prefix=None):
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if usage is not SUPPRESS:
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args = usage, actions, groups, prefix
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self._add_item(self._format_usage, args)
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def add_argument(self, action):
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if action.help is not SUPPRESS:
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# find all invocations
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get_invocation = self._format_action_invocation
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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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# 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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# add the item to the list
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self._add_item(self._format_action, [action])
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def add_arguments(self, actions):
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for action in actions:
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self.add_argument(action)
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# =======================
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# Help-formatting methods
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# =======================
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def format_help(self):
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help = self._root_section.format_help()
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if help:
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help = self._long_break_matcher.sub('\n\n', help)
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help = help.strip('\n') + '\n'
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return help
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def _join_parts(self, part_strings):
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return ''.join([part
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for part in part_strings
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if part and part is not SUPPRESS])
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def _format_usage(self, usage, actions, groups, prefix):
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if prefix is None:
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prefix = _('usage: ')
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# if usage is specified, use that
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if usage is not None:
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usage = usage % dict(prog=self._prog)
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# if no optionals or positionals are available, usage is just prog
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elif usage is None and not actions:
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usage = '%(prog)s' % dict(prog=self._prog)
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# if optionals and positionals are available, calculate usage
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elif usage is None:
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prog = '%(prog)s' % dict(prog=self._prog)
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# split optionals from positionals
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optionals = []
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positionals = []
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for action in actions:
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if action.option_strings:
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optionals.append(action)
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else:
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positionals.append(action)
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# build full usage string
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format = self._format_actions_usage
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action_usage = format(optionals + positionals, groups)
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usage = ' '.join([s for s in [prog, action_usage] if s])
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# wrap the usage parts if it's too long
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text_width = self._width - self._current_indent
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if len(prefix) + len(usage) > text_width:
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# break usage into wrappable parts
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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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# 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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# if prog is short, follow it with optionals or positionals
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if len(prefix) + len(prog) <= 0.75 * text_width:
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indent = ' ' * (len(prefix) + len(prog) + 1)
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if opt_parts:
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lines = get_lines([prog] + opt_parts, indent, prefix)
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lines.extend(get_lines(pos_parts, indent))
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elif pos_parts:
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lines = get_lines([prog] + pos_parts, indent, prefix)
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else:
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lines = [prog]
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# if prog is long, put it on its own line
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else:
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indent = ' ' * len(prefix)
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parts = opt_parts + pos_parts
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lines = get_lines(parts, indent)
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if len(lines) > 1:
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lines = []
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lines.extend(get_lines(opt_parts, indent))
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lines.extend(get_lines(pos_parts, indent))
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lines = [prog] + lines
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# join lines into usage
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usage = '\n'.join(lines)
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# prefix with 'usage:'
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return '%s%s\n\n' % (prefix, usage)
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def _format_actions_usage(self, actions, groups):
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# 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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# collect all actions format strings
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parts = []
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for i, action in enumerate(actions):
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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) == '|':
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inserts.pop(i + 1)
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# produce all arg strings
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elif not action.option_strings:
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part = self._format_args(action, action.dest)
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# if it's in a group, strip the outer []
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if action in group_actions:
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if part[0] == '[' and part[-1] == ']':
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part = part[1:-1]
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# add the action string to the list
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parts.append(part)
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# produce the first way to invoke the option in brackets
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else:
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option_string = action.option_strings[0]
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# if the Optional doesn't take a value, format is:
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# -s or --long
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if action.nargs == 0:
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part = '%s' % option_string
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# if the Optional takes a value, format is:
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# -s ARGS or --long ARGS
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else:
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default = action.dest.upper()
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args_string = self._format_args(action, default)
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part = '%s %s' % (option_string, args_string)
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# make it look optional if it's not required or in a group
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if not action.required and action not in group_actions:
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part = '[%s]' % part
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# add the action string to the list
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parts.append(part)
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# insert things at the necessary indices
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for i in sorted(inserts, reverse=True):
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parts[i:i] = [inserts[i]]
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# join all the action items with spaces
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text = ' '.join([item for item in parts if item is not None])
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# clean up separators for mutually exclusive groups
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open = r'[\[(]'
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close = r'[\])]'
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text = _re.sub(r'(%s) ' % open, r'\1', text)
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text = _re.sub(r' (%s)' % close, r'\1', text)
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text = _re.sub(r'%s *%s' % (open, close), r'', text)
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text = _re.sub(r'\(([^|]*)\)', r'\1', text)
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text = text.strip()
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# return the text
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return text
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def _format_text(self, text):
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if '%(prog)' in text:
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text = text % dict(prog=self._prog)
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text_width = self._width - self._current_indent
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indent = ' ' * self._current_indent
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return self._fill_text(text, text_width, indent) + '\n\n'
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def _format_action(self, action):
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# determine the required width and the entry label
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help_position = min(self._action_max_length + 2,
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self._max_help_position)
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help_width = self._width - help_position
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action_width = help_position - self._current_indent - 2
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action_header = self._format_action_invocation(action)
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# ho nelp; start on same line and add a final newline
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if not action.help:
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tup = self._current_indent, '', action_header
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action_header = '%*s%s\n' % tup
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# short action name; start on the same line and pad two spaces
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elif len(action_header) <= action_width:
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tup = self._current_indent, '', action_width, action_header
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action_header = '%*s%-*s ' % tup
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indent_first = 0
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# long action name; start on the next line
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else:
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tup = self._current_indent, '', action_header
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action_header = '%*s%s\n' % tup
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indent_first = help_position
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# collect the pieces of the action help
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parts = [action_header]
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# if there was help for the action, add lines of help text
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if action.help:
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help_text = self._expand_help(action)
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help_lines = self._split_lines(help_text, help_width)
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parts.append('%*s%s\n' % (indent_first, '', help_lines[0]))
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for line in help_lines[1:]:
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parts.append('%*s%s\n' % (help_position, '', line))
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|
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# or add a newline if the description doesn't end with one
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elif not action_header.endswith('\n'):
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parts.append('\n')
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|
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# if there are any sub-actions, add their help as well
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for subaction in self._iter_indented_subactions(action):
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parts.append(self._format_action(subaction))
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# return a single string
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return self._join_parts(parts)
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|
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def _format_action_invocation(self, action):
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if not action.option_strings:
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metavar, = self._metavar_formatter(action, action.dest)(1)
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return metavar
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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, _StoreAction) 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)
|