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opts.py
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opts.py
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# coding: utf-8
"""
opts
~~~~
A simple option parser.
:copyright: 2010 by Daniel Neuhäuser
:license: BSD, see LICENSE for details.
"""
import sys
import codecs
from decimal import Decimal
from inspect import getmembers
from itertools import count, izip_longest, izip
from operator import attrgetter, itemgetter
__all__ = ["Option", "BooleanOption", "IntOption", "FloatOption",
"DecimalOption", "MultipleOptions", "Positional", "IntPositional",
"FloatPositional", "DecimalPositional", "Command", "Parser"]
missing = object()
_next_position_hint = count().next
class Missing(object):
def __nonzero__(self):
return False
def __repr__(self):
return "missing"
#: Represents the absence of a value.
missing = Missing()
del Missing
def decode_arguments(arguments,
encoding=sys.stdin.encoding or sys.getdefaultencoding()):
"""
If any of the items in the given ``arguments`` list is a byte string it
will be decoded using the given ``encoding``.
"""
decoded = []
for argument in arguments:
if not isinstance(argument, unicode):
argument = argument.decode(encoding)
decoded.append(argument)
return decoded
def shorter(string):
for i in xrange(1, len(string)):
yield string, string[:-1]
def abbreviations(strings):
"""
Returns a dictionary with abbreviations of the given `strings` as keys for
those.
"""
strings = list(strings)
string_to_abbs = dict((s, []) for s in strings)
for abbs in izip_longest(*map(shorter, strings)):
abbs = dict(a or (strings[i], None) for i, a in enumerate(abbs))
values = abbs.values()
for key, value in abbs.iteritems():
if value is not None and values.count(value) == 1:
string_to_abbs[key].append(value)
result = {}
for string, abbs in string_to_abbs.iteritems():
for abb in abbs:
result[abb] = string
return result
def matches(beginning, strings):
"""
Returns every string from the given `strings` starting with the given
`beginning`.
"""
for string in strings:
if string.startswith(beginning):
yield string
def parse_multiple(string):
buffer = []
open_quote = False
for char in string:
if char in [u"'", u'"']:
if open_quote:
yield u''.join(buffer)
buffer = []
open_quote = not open_quote
elif char == u',' and not open_quote:
if not buffer:
continue
yield u''.join(buffer)
buffer = []
else:
buffer.append(char)
if buffer:
yield u''.join(buffer)
class Node(object):
"""
Represents an argument passed to your script.
:param short_description:
A short description no longer than one line.
:param long_description:
A longer detailed description.
"""
def __init__(self, short_description=None, long_description=None):
self.short_description = short_description
self.long_description = long_description
self._position_hint = _next_position_hint()
@property
def short_description(self):
return self._short_description or u"No short description."
@short_description.setter
def short_description(self, short_description):
self._short_description = short_description
@property
def long_description(self):
desc = self._long_description or self._short_description
return desc or u"No long description."
@long_description.setter
def long_description(self, long_description):
self._long_description = long_description
def evaluate(self, callpath, argument):
"""
Evaluates the given argument
"""
raise NotImplementedError("{0}.evaluate(callpath, argument)" \
.format(self.__class__.__name__))
def __repr__(self):
return "{0}(short_description={1!r}, long_description={2!r})" \
.format(self.__class__.__name__, self.short_description,
self.long_description)
class IntNodeMixin(object):
def evaluate(self, callpath, argument):
return int(argument)
class FloatNodeMixin(object):
def evaluate(self, callpath, argument):
return float(argument)
class DecimalNodeMixin(object):
def evaluate(self, callpath, argument):
return Decimal(argument)
class Option(Node):
"""
Represents a string option.
:param short:
A short variant of the option without the prefixed ``-``.
:param long:
A long variant of the option without the prefixed ``--``.
:param default:
The default value for this option.
:param short_description:
A short one-line description which can be displayed along with
several other short descriptions by the help command.
:param long_description:
A long detailed description.
"""
#: Set to ``True`` if this option requires an argument for evaluation.
requires_argument = True
#: Set this to ``True`` if the option allows an argument but does not
#: require it.
allows_optional_argument = False
def __init__(self, short=None, long=None, default=missing,
short_description=None, long_description=None):
Node.__init__(self, short_description=short_description,
long_description=long_description)
if short is long is None:
raise ValueError("you need to specify a short and/or long")
self.short = short if short is None else unicode(short)
self.long = long if long is None else unicode(long)
self.default = default
def evaluate(self, callpath, argument=missing):
"""
Evaluates the argument for this option.
"""
return argument
def __repr__(self):
return ("{0}(short={1!r}, long={2!r}, default={3!r}, "
"short_description={4!r}, "
"long_description={5!r})").format(self.__class__.__name__,
self.short, self.long,
self.default,
self.short_description,
self.long_description)
class BooleanOption(Option):
"""
Represents a boolean option, it evaluates always to the opposite of the
default value.
"""
requires_argument = False
def __init__(self, short=None, long=None, default=False,
short_description=None, long_description=None):
Option.__init__(self, short=short, long=long, default=default,
short_description=short_description,
long_description=long_description)
def evaluate(self, callpath):
return not self.default
class IntOption(IntNodeMixin, Option):
"""
Represents an integer option.
"""
class FloatOption(FloatNodeMixin, Option):
"""
Represents a float option.
"""
class DecimalOption(DecimalNodeMixin, Option):
"""
Represents a decimal option.
"""
class MultipleOptions(Option):
"""
Represents multiple values which are evaluated using the given
``sub_option``.
The values are seperated by commas, strings containing commas can be
represented using single and double quotes::
"foo,bar,baz" -> ["foo", "bar", "baz"]
"foo,'bar,bar'" -> ["foo", "bar,baz"]
'foo,"bar,baz"' -> ["foo", "bar,baz"]
"""
def __init__(self, sub_option=Option, short=None, long=None,
default=missing, short_description=None,
long_description=None):
Option.__init__(self, short=short, long=long, default=default,
short_description=short_description,
long_description=long_description)
self.sub_option = sub_option(long=u'sub-option')
def evaluate(self, callpath, argument):
sub_option_cp = callpath + [(u'--sub-option', self.sub_option)]
return [
self.sub_option.evaluate(sub_option_cp, arg)
for arg in parse_multiple(argument)
]
class Positional(Node):
"""
Represents a positional string argument.
:param metavar:
The metavariable which should be used to represent this argument in the
help message and the usage string.
"""
def __init__(self, metavar, short_description=None, long_description=None):
Node.__init__(self, short_description=short_description,
long_description=long_description)
self.metavar = metavar
def evaluate(self, callpath, argument):
return argument
def __repr__(self):
return '{0}({1!r}, short_description={2!r}, long_description={3!r})'. \
format(self.__class__.__name__, self.metavar,
self.short_description, self.long_description)
class IntPositional(IntNodeMixin, Positional):
"""
Represents a positional integer argument.
"""
class FloatPositional(FloatNodeMixin, Positional):
"""
Represents a positional float argument.
"""
class DecimalPositional(DecimalNodeMixin, Positional):
"""
Represents a positional float argument.
"""
def get_option_attributes(obj):
return getmembers(obj, lambda x: isinstance(x, Option))
def get_command_attributes(obj):
return getmembers(obj, lambda x: isinstance(x, Command))
class Command(Node):
"""
Represents a command which unlike an option is not prefixed. A command can
have several options and/or commands.
Options or commands can be defined by passing them to the constructor in
a dictionary or by defining them declerativley on a subclass.
:param callback:
A function which get's called with the result of the evaluation instead
of returning it.
"""
positionals = []
#: If ``True`` allows commands to be abbreviated e.g. you can pass ``he``
#: instead of ``help`` as long as there is no conflict with other commands.
allow_abbreviated_commands = True
#: The same as :attr:`allow_abbreviated_commands` for long options.
allow_abbreviated_options = True
#: If the command does not require any arguments additional to the options
#: and commands, set this to ``False``.
takes_arguments = True
#: If ``True`` a help command is added to this command.
use_auto_help = True
def __init__(self, options=None, commands=None, positionals=None,
short_description=None, long_description=None, callback=None,
allow_abbreviated_commands=None,
allow_abbreviated_options=None,
takes_arguments=None):
Node.__init__(self, short_description=short_description,
long_description=long_description)
self.options = dict(get_option_attributes(self.__class__),
**(options or {}))
self.commands = dict(get_command_attributes(self.__class__),
**(commands or {}))
if positionals is not None:
self.positionals = positionals
if self.use_auto_help:
self.commands.setdefault(u"help", HelpCommand())
if callback is None or not hasattr(self, "callback"):
self.callback = callback
if allow_abbreviated_commands is not None:
self.allow_abbreviated_commands = allow_abbreviated_commands
if allow_abbreviated_options is not None:
self.allow_abbreviated_options = allow_abbreviated_options
if takes_arguments is not None:
self.takes_arguments = takes_arguments
@property
def short_options(self):
"""
A dictionary mapping the short variants of the options to a tuple of
the name of the option and the option itself.
"""
result = {}
for name, option in self.options.iteritems():
result[option.short] = (name, option)
return result
@property
def long_options(self):
"""
A dictionary mapping the long variants of the options to a tuple of
the name of the option and the option itself.
"""
long_options = {}
for name, option in self.options.iteritems():
long_options[option.long] = (name, option)
if not self.allow_abbreviated_options:
return long_options
result = long_options.copy()
for abbr, long_option in abbreviations(long_options).iteritems():
result[abbr] = long_options[long_option]
return result
@property
def all_commands(self):
"""
A dictionary mapping the command names (including abbreviations) to a
tuple of the complete command name and the command itself.
"""
commands = dict((k, (k, v)) for k, v in self.commands.iteritems())
if not self.allow_abbreviated_commands:
return commands.copy()
for abbr, command in abbreviations(commands).iteritems():
commands[abbr] = commands[command]
return commands
def apply_defaults(self, defaults):
for key, value in defaults.iteritems():
try:
command = self.commands[key]
except KeyError:
self.options[key].default = value
else:
command.apply_defaults(value)
def get_usage(self, callpath):
result = [u'usage: {0}'.format(u' '.join(map(itemgetter(0), callpath)))]
if self.options:
result.append(u'[options]')
if len(self.commands) > 1 or \
self.commands and u'help' not in self.commands:
result.append(u'[commands]')
for positional in self.positionals:
result.append(positional.metavar)
return u' '.join(result)
def print_missing_node(self, node, callpath):
write = lambda x: callpath[0][1].out_file.write(x + u"\n")
if node.startswith(u"-"):
write(callpath[-2][1].get_usage(callpath[:1]))
type = u"option"
possible_items = [option.long for option in self.options.values()]
else:
write(callpath[-1][1].get_usage(callpath[:1]))
type = u"command"
possible_items = self.commands.keys()
write(u'')
for shorter_version in shorter(node.strip(u'-')):
items = list(matches(shorter_version, possible_items))
if items:
break
else:
items = list(matches(node.strip(u'-'), possible_items))
if not items:
write(u"The given {0} \"{1}\" does not exist.".format(type, node))
sys.exit(1)
write(u"The given {0} \"{1}\" does not exist, did you mean?" \
.format(type, node))
for item in items:
item = u'-' * node[:2].count(u'-') + item
write(u" - {0}".format(item))
write(u"")
sys.exit(1)
def evaluate(self, callpath, arguments):
"""
Evaluates the given list of ``arguments`` and returns a dictionary with
the options and a list with remaining arguments.
"""
options = {}
for name, option in self.options.iteritems():
if option.default is not missing:
options[name] = option.default
result = options, []
argument_iter = enumerate(arguments)
for i, argument in argument_iter:
if argument.startswith(u"--"):
callpath.append((argument, None))
options.update(self.evaluate_long_option(callpath,
argument[2:],
argument_iter))
elif argument.startswith(u"-"):
callpath.append((argument, None))
options.update(self.evaluate_short_options(callpath,
list(argument[1:]),
argument_iter))
else:
try:
name, command = self.all_commands[arguments[i]]
except KeyError:
if not self.takes_arguments:
self.print_missing_node(arguments[i], callpath)
return
result = options, arguments[i:]
break
callpath.append((arguments[i], command))
result = command.evaluate(callpath, arguments[1 + i:])
if self.callback is not None:
self.callback(*result)
result = {name: result}, []
break
if self.positionals:
for i, (positional, arg) in enumerate(izip(self.positionals,
result[1])):
callpath.append((positional.metavar, positional))
result[1][i] = positional.evaluate(callpath, arg)
return result
def evaluate_short_options(self, callpath, shorts, arguments):
result = {}
for short in shorts:
try:
name, option = self.short_options[short]
except KeyError:
self.print_missing_node(u"-" + short, callpath)
callpath[-1] = (callpath[-1][0], option)
if option.requires_argument:
result[name] = option.evaluate(callpath, arguments.next()[1])
elif option.allows_optional_argument:
try:
argument = arguments.next()[1]
except StopIteration:
result[name] = option.evaluate(callpath)
else:
result[name] = option.evaluate(callpath, argument)
else:
result[name] = option.evaluate(callpath)
return result
def evaluate_long_option(self, callpath, long, arguments):
try:
name, option = self.long_options[long]
except KeyError:
self.print_missing_node(callpath[-1][0], callpath)
callpath[-1] = (callpath[-1][0], option)
used_arguments = []
if option.requires_argument:
value = option.evaluate(callpath, arguments.next()[1])
elif option.allows_optional_argument:
try:
argument = arguments.next()[1]
except StopIteration:
value = option.evaluate(callpath)
else:
value = option.evaluate(callpath, argument)
else:
value = option.evaluate(callpath)
return {name: value}
def __getattr__(self, name):
for d in [self.commands, self.options]:
try:
return d[name]
except KeyError:
pass
raise AttributeError(name)
def __repr__(self):
return ("{0}(options={1!r}, commands={2!r}, short_description={2!r}, "
"long_description={3!r}, callback={4!r})"). \
format(self.__class__.__name__, self.options,
self.commands, self.short_description,
self.long_description, self.callback)
class HelpCommand(Command):
use_auto_help = False
def __init__(self, options=None, commands=None,
short_description=u"Shows this message.",
long_description=u"Shows help messages.",
callback=None,
allow_abbreviated_commands=None,
allow_abbreviated_options=None):
Command.__init__(self, options=options, commands=commands,
short_description=short_description,
long_description=long_description, callback=callback,
allow_abbreviated_commands=allow_abbreviated_commands,
allow_abbreviated_options=allow_abbreviated_options)
def evaluate(self, callpath, arguments):
def get_node(node, argument, d):
try:
node = d[node][1]
except KeyError:
command.print_missing_node(argument, callpath)
return node
command = callpath[-2][1]
try:
argument = arguments[0]
except IndexError:
argument, node = callpath[-2]
callpath = callpath[:-1]
else:
if argument.startswith(u'--'):
node = get_node(
argument[2:],
argument,
command.long_options,
)
argument = argument[2:]
if argument.startswith(u'-'):
node = get_node(
argument[1:],
argument,
command.short_options,
)
argument = argument[1:]
else:
node = get_node(
argument,
argument,
command.all_commands,
)
callpath = callpath[:-1] + [(argument, None)]
write = lambda x: callpath[0][1].out_file.write(x + u"\n")
write(node.get_usage(callpath))
write(u"")
write(node.long_description)
write(u"")
if not isinstance(node, Command):
sys.exit(1)
commands = sorted(node.commands.items(),
key=lambda x: x[1]._position_hint)
options = sorted(node.options.values(),
key=attrgetter("_position_hint"))
nodes = []
get_length = lambda nodes: max(10, max(len(n[0]) for n in nodes))
if commands:
nodes.append((u"Commands:", get_length(commands), commands))
if options:
option_nodes = []
for option in options:
if option.short is None:
option_nodes.append(
(u'--{0}'.format(option.long), option)
)
elif option.long is None:
option_nodes.append(
(u'-{0}'.format(option.short), option)
)
else:
option_nodes.append((
u'-{0} --{1}'.format(
option.short, option.long
),
option
))
nodes.append((u"Options:", get_length(option_nodes), option_nodes))
if getattr(node, 'positionals', False):
positional_nodes = [(p.metavar, p) for p in node.positionals]
nodes.append((
u"Positional arguments:",
get_length(positional_nodes),
positional_nodes
))
for label, max_node_length, nodes in nodes:
write(label)
for node_name, node in nodes:
write(u" {0} {1}".format(node_name.ljust(max_node_length),
node.short_description))
write("")
sys.exit(1)
class Parser(Command):
def __init__(self, options=None, commands=None, positionals=None,
script_name=None, description=None, out_file=sys.stdout,
takes_arguments=None,defaults=None):
Command.__init__(self, options=options, commands=commands,
positionals=positionals,
long_description=description,
takes_arguments=takes_arguments)
self.script_name = sys.argv[0] if script_name is None else script_name
self.out_file = out_file
if defaults is not None:
self.apply_defaults(defaults)
@property
def out_file(self):
"""
A file-like object to which any output is being written.
"""
return self._out_file
@out_file.setter
def out_file(self, fobj):
if isinstance(fobj, codecs.StreamReaderWriter):
self._out_file = fobj
encoding = getattr(fobj, "encoding", None)
if encoding is None:
encoding = "ascii"
errors = "replace"
else:
errors = "strict"
codec_info = codecs.lookup(encoding)
self._out_file = codecs.StreamReaderWriter(fobj,
codec_info.streamreader,
codec_info.streamwriter,
errors)
def evaluate(self, arguments=None):
"""
Evaluates the given list of ``arguments`` and returns a dictionary with
the options and a list with the remaining arguments.
"""
if arguments is None:
arguments = sys.argv[1:]
arguments = decode_arguments(arguments)
return Command.evaluate(self, [(self.script_name, self)], arguments)
def __repr__(self):
return "{0}(script_name={1!r}, description={2!r})" \
.format(self.__class__.__name__, self.script_name,
self.long_description)