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giovannibajo
ee5f650473
git-svn-id: http://svn.pyinstaller.org/trunk@320 8dd32b29-ccff-0310-8a9a-9233e24343b1
850 lines
30 KiB
Python
850 lines
30 KiB
Python
"""optik.option_parser
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Provides the OptionParser and Values classes.
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"""
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# Copyright (c) 2001-2004 Gregory P. Ward. All rights reserved.
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# See the README.txt distributed with Optik for licensing terms.
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import sys, os
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import types, string
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from optik.option import Option, NO_DEFAULT, _repr
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from optik.help import IndentedHelpFormatter
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from optik import errors
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from optik.errors import gettext
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_ = gettext
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__revision__ = "$Id: option_parser.py 470 2004-12-07 01:39:56Z gward $"
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__all__ = ['SUPPRESS_HELP', 'SUPPRESS_USAGE',
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'Values', 'OptionContainer', 'OptionGroup', 'OptionParser']
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SUPPRESS_HELP = "SUPPRESS"+"HELP"
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SUPPRESS_USAGE = "SUPPRESS"+"USAGE"
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# For compatibility with Python 2.2
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try:
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True, False
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except NameError:
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(True, False) = (1, 0)
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def isbasestring(x):
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return isinstance(x, types.StringType) or isinstance(x, types.UnicodeType)
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if not hasattr(string, "startswith"):
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def startswith(s, prefix):
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return s[:len(prefix)] == prefix
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string.startswith = startswith
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class Values:
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def __init__(self, defaults=None):
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if defaults:
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for (attr, val) in defaults.items():
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setattr(self, attr, val)
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def __str__(self):
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return str(self.__dict__)
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__repr__ = _repr
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def __cmp__(self, other):
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if isinstance(other, Values):
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return cmp(self.__dict__, other.__dict__)
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elif isinstance(other, types.DictType):
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return cmp(self.__dict__, other)
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else:
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return -1
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def _update_careful(self, dict):
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"""
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Update the option values from an arbitrary dictionary, but only
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use keys from dict that already have a corresponding attribute
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in self. Any keys in dict without a corresponding attribute
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are silently ignored.
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"""
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for attr in dir(self):
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if dict.has_key(attr):
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dval = dict[attr]
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if dval is not None:
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setattr(self, attr, dval)
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def _update_loose(self, dict):
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"""
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Update the option values from an arbitrary dictionary,
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using all keys from the dictionary regardless of whether
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they have a corresponding attribute in self or not.
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"""
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self.__dict__.update(dict)
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def _update(self, dict, mode):
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if mode == "careful":
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self._update_careful(dict)
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elif mode == "loose":
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self._update_loose(dict)
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else:
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raise ValueError, "invalid update mode: %s" % repr(mode)
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def read_module(self, modname, mode="careful"):
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__import__(modname)
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mod = sys.modules[modname]
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self._update(vars(mod), mode)
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def read_file(self, filename, mode="careful"):
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vars = {}
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execfile(filename, vars)
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self._update(vars, mode)
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def ensure_value(self, attr, value):
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if not hasattr(self, attr) or getattr(self, attr) is None:
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setattr(self, attr, value)
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return getattr(self, attr)
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class OptionContainer:
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"""
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Abstract base class.
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Class attributes:
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standard_option_list : [Option]
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list of standard options that will be accepted by all instances
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of this parser class (intended to be overridden by subclasses).
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Instance attributes:
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option_list : [Option]
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the list of Option objects contained by this OptionContainer
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_short_opt : { string : Option }
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dictionary mapping short option strings, eg. "-f" or "-X",
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to the Option instances that implement them. If an Option
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has multiple short option strings, it will appears in this
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dictionary multiple times. [1]
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_long_opt : { string : Option }
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dictionary mapping long option strings, eg. "--file" or
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"--exclude", to the Option instances that implement them.
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Again, a given Option can occur multiple times in this
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dictionary. [1]
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defaults : { string : any }
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dictionary mapping option destination names to default
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values for each destination [1]
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[1] These mappings are common to (shared by) all components of the
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controlling OptionParser, where they are initially created.
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"""
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def __init__(self, option_class, conflict_handler, description):
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# Initialize the option list and related data structures.
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# This method must be provided by subclasses, and it must
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# initialize at least the following instance attributes:
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# option_list, _short_opt, _long_opt, defaults.
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self._create_option_list()
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self.option_class = option_class
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self.set_conflict_handler(conflict_handler)
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self.set_description(description)
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def _create_option_mappings(self):
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# For use by OptionParser constructor -- create the master
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# option mappings used by this OptionParser and all
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# OptionGroups that it owns.
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self._short_opt = {} # single letter -> Option instance
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self._long_opt = {} # long option -> Option instance
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self.defaults = {} # maps option dest -> default value
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def _share_option_mappings(self, parser):
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# For use by OptionGroup constructor -- use shared option
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# mappings from the OptionParser that owns this OptionGroup.
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self._short_opt = parser._short_opt
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self._long_opt = parser._long_opt
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self.defaults = parser.defaults
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def set_conflict_handler(self, handler):
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if handler not in ("error", "resolve"):
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raise ValueError, "invalid conflict_resolution value %s" % repr(handler)
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self.conflict_handler = handler
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def set_description(self, description):
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self.description = description
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def get_description(self):
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return self.description
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# -- Option-adding methods -----------------------------------------
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def _check_conflict(self, option):
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conflict_opts = []
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for opt in option._short_opts:
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if self._short_opt.has_key(opt):
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conflict_opts.append((opt, self._short_opt[opt]))
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for opt in option._long_opts:
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if self._long_opt.has_key(opt):
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conflict_opts.append((opt, self._long_opt[opt]))
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if conflict_opts:
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handler = self.conflict_handler
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if handler == "error":
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opts = []
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for co in conflict_opts:
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opts.append(co[0])
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raise errors.OptionConflictError(
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"conflicting option string(s): %s"
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% string.join(opts, ", "),
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option)
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elif handler == "resolve":
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for (opt, c_option) in conflict_opts:
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if string.startswith(opt, "--"):
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c_option._long_opts.remove(opt)
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del self._long_opt[opt]
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else:
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c_option._short_opts.remove(opt)
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del self._short_opt[opt]
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if not (c_option._short_opts or c_option._long_opts):
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c_option.container.option_list.remove(c_option)
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def add_option(self, *args, **kwargs):
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"""add_option(Option)
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add_option(opt_str, ..., kwarg=val, ...)
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"""
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if type(args[0]) is types.StringType:
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option = apply(self.option_class, args, kwargs)
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elif len(args) == 1 and not kwargs:
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option = args[0]
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if not isinstance(option, Option):
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raise TypeError, "not an Option instance: %s" % repr(option)
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else:
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raise TypeError, "invalid arguments"
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self._check_conflict(option)
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self.option_list.append(option)
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option.container = self
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for opt in option._short_opts:
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self._short_opt[opt] = option
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for opt in option._long_opts:
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self._long_opt[opt] = option
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if option.dest is not None: # option has a dest, we need a default
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if option.default is not NO_DEFAULT:
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self.defaults[option.dest] = option.default
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elif not self.defaults.has_key(option.dest):
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self.defaults[option.dest] = None
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return option
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def add_options(self, option_list):
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for option in option_list:
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self.add_option(option)
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# -- Option query/removal methods ----------------------------------
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def get_option(self, opt_str):
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return (self._short_opt.get(opt_str) or
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self._long_opt.get(opt_str))
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def has_option(self, opt_str):
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return (self._short_opt.has_key(opt_str) or
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self._long_opt.has_key(opt_str))
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def remove_option(self, opt_str):
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option = self._short_opt.get(opt_str)
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if option is None:
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option = self._long_opt.get(opt_str)
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if option is None:
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raise ValueError("no such option %s" % repr(opt_str))
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for opt in option._short_opts:
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del self._short_opt[opt]
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for opt in option._long_opts:
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del self._long_opt[opt]
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option.container.option_list.remove(option)
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# -- Help-formatting methods ---------------------------------------
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def format_option_help(self, formatter):
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if not self.option_list:
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return ""
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result = []
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for option in self.option_list:
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if not option.help is SUPPRESS_HELP:
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result.append(formatter.format_option(option))
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return string.join(result, "")
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def format_description(self, formatter):
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return formatter.format_description(self.get_description())
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def format_help(self, formatter):
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result = []
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if self.description:
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result.append(self.format_description(formatter))
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if self.option_list:
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result.append(self.format_option_help(formatter))
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return string.join(result, "\n")
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class OptionGroup (OptionContainer):
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def __init__(self, parser, title, description=None):
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self.parser = parser
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OptionContainer.__init__(
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self, parser.option_class, parser.conflict_handler, description)
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self.title = title
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def _create_option_list(self):
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self.option_list = []
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self._share_option_mappings(self.parser)
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def set_title(self, title):
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self.title = title
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# -- Help-formatting methods ---------------------------------------
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def format_help(self, formatter):
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result = formatter.format_heading(self.title)
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formatter.indent()
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result = result + OptionContainer.format_help(self, formatter)
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formatter.dedent()
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return result
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class OptionParser (OptionContainer):
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"""
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Class attributes:
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standard_option_list : [Option]
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list of standard options that will be accepted by all instances
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of this parser class (intended to be overridden by subclasses).
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Instance attributes:
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usage : string
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a usage string for your program. Before it is displayed
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to the user, "%prog" will be expanded to the name of
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your program (self.prog or os.path.basename(sys.argv[0])).
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prog : string
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the name of the current program (to override
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os.path.basename(sys.argv[0])).
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option_groups : [OptionGroup]
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list of option groups in this parser (option groups are
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irrelevant for parsing the command-line, but very useful
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for generating help)
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allow_interspersed_args : bool = true
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if true, positional arguments may be interspersed with options.
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Assuming -a and -b each take a single argument, the command-line
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-ablah foo bar -bboo baz
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will be interpreted the same as
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-ablah -bboo -- foo bar baz
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If this flag were false, that command line would be interpreted as
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-ablah -- foo bar -bboo baz
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-- ie. we stop processing options as soon as we see the first
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non-option argument. (This is the tradition followed by
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Python's getopt module, Perl's Getopt::Std, and other argument-
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parsing libraries, but it is generally annoying to users.)
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process_default_values : bool = true
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if true, option default values are processed similarly to option
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values from the command line: that is, they are passed to the
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type-checking function for the option's type (as long as the
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default value is a string). (This really only matters if you
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have defined custom types; see SF bug #955889.) Set it to false
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to restore the behaviour of Optik 1.4.1 and earlier.
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rargs : [string]
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the argument list currently being parsed. Only set when
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parse_args() is active, and continually trimmed down as
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we consume arguments. Mainly there for the benefit of
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callback options.
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largs : [string]
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the list of leftover arguments that we have skipped while
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parsing options. If allow_interspersed_args is false, this
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list is always empty.
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values : Values
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the set of option values currently being accumulated. Only
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set when parse_args() is active. Also mainly for callbacks.
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Because of the 'rargs', 'largs', and 'values' attributes,
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OptionParser is not thread-safe. If, for some perverse reason, you
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need to parse command-line arguments simultaneously in different
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threads, use different OptionParser instances.
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"""
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standard_option_list = []
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def __init__(self,
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usage=None,
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option_list=None,
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option_class=Option,
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version=None,
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conflict_handler="error",
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description=None,
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formatter=None,
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add_help_option=True,
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prog=None):
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OptionContainer.__init__(
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self, option_class, conflict_handler, description)
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self.set_usage(usage)
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self.prog = prog
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self.version = version
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self.allow_interspersed_args = True
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self.process_default_values = True
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if formatter is None:
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formatter = IndentedHelpFormatter()
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self.formatter = formatter
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self.formatter.set_parser(self)
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# Populate the option list; initial sources are the
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# standard_option_list class attribute, the 'option_list'
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# argument, and (if applicable) the _add_version_option() and
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# _add_help_option() methods.
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self._populate_option_list(option_list,
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add_help=add_help_option)
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self._init_parsing_state()
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# -- Private methods -----------------------------------------------
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# (used by our or OptionContainer's constructor)
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def _create_option_list(self):
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self.option_list = []
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self.option_groups = []
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self._create_option_mappings()
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def _add_help_option(self):
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self.add_option("-h", "--help",
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action="help",
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help=_("show this help message and exit"))
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def _add_version_option(self):
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self.add_option("--version",
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action="version",
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help=_("show program's version number and exit"))
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def _populate_option_list(self, option_list, add_help=True):
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if self.standard_option_list:
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self.add_options(self.standard_option_list)
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if option_list:
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self.add_options(option_list)
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if self.version:
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self._add_version_option()
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if add_help:
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self._add_help_option()
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def _init_parsing_state(self):
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# These are set in parse_args() for the convenience of callbacks.
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self.rargs = None
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self.largs = None
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self.values = None
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# -- Simple modifier methods ---------------------------------------
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def set_usage(self, usage):
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if usage is None:
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self.usage = _("%prog [options]")
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elif usage is SUPPRESS_USAGE:
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self.usage = None
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# For backwards compatibility with Optik 1.3 and earlier.
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elif string.startswith(usage, "usage:" + " "):
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self.usage = usage[7:]
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else:
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self.usage = usage
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def enable_interspersed_args(self):
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self.allow_interspersed_args = True
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def disable_interspersed_args(self):
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self.allow_interspersed_args = False
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def set_process_default_values(self, process):
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self.process_default_values = process
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def set_default(self, dest, value):
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self.defaults[dest] = value
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def set_defaults(self, **kwargs):
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self.defaults.update(kwargs)
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def _get_all_options(self):
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options = self.option_list[:]
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for group in self.option_groups:
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options.extend(group.option_list)
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return options
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def get_default_values(self):
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if not self.process_default_values:
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# Old, pre-Optik 1.5 behaviour.
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return Values(self.defaults)
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defaults = self.defaults.copy()
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for option in self._get_all_options():
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default = defaults.get(option.dest)
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if isbasestring(default):
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opt_str = option.get_opt_string()
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defaults[option.dest] = option.check_value(opt_str, default)
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return Values(defaults)
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# -- OptionGroup methods -------------------------------------------
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def add_option_group(self, *args, **kwargs):
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# XXX lots of overlap with OptionContainer.add_option()
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if type(args[0]) is types.StringType:
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group = apply(OptionGroup, (self,) + args, kwargs)
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elif len(args) == 1 and not kwargs:
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group = args[0]
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if not isinstance(group, OptionGroup):
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raise TypeError, "not an OptionGroup instance: %s" % repr(group)
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if group.parser is not self:
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raise ValueError, "invalid OptionGroup (wrong parser)"
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else:
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raise TypeError, "invalid arguments"
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self.option_groups.append(group)
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return group
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def get_option_group(self, opt_str):
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option = (self._short_opt.get(opt_str) or
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self._long_opt.get(opt_str))
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if option and option.container is not self:
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return option.container
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return None
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# -- Option-parsing methods ----------------------------------------
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def _get_args(self, args):
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if args is None:
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return sys.argv[1:]
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else:
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return args[:] # don't modify caller's list
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def parse_args(self, args=None, values=None):
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"""
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parse_args(args : [string] = sys.argv[1:],
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values : Values = None)
|
|
-> (values : Values, args : [string])
|
|
|
|
Parse the command-line options found in 'args' (default:
|
|
sys.argv[1:]). Any errors result in a call to 'error()', which
|
|
by default prints the usage message to stderr and calls
|
|
sys.exit() with an error message. On success returns a pair
|
|
(values, args) where 'values' is an Values instance (with all
|
|
your option values) and 'args' is the list of arguments left
|
|
over after parsing options.
|
|
"""
|
|
rargs = self._get_args(args)
|
|
if values is None:
|
|
values = self.get_default_values()
|
|
|
|
# Store the halves of the argument list as attributes for the
|
|
# convenience of callbacks:
|
|
# rargs
|
|
# the rest of the command-line (the "r" stands for
|
|
# "remaining" or "right-hand")
|
|
# largs
|
|
# the leftover arguments -- ie. what's left after removing
|
|
# options and their arguments (the "l" stands for "leftover"
|
|
# or "left-hand")
|
|
self.rargs = rargs
|
|
self.largs = largs = []
|
|
self.values = values
|
|
|
|
try:
|
|
stop = self._process_args(largs, rargs, values)
|
|
except (errors.BadOptionError, errors.OptionValueError), err:
|
|
self.error(str(err))
|
|
|
|
args = largs + rargs
|
|
return self.check_values(values, args)
|
|
|
|
def check_values(self, values, args):
|
|
"""
|
|
check_values(values : Values, args : [string])
|
|
-> (values : Values, args : [string])
|
|
|
|
Check that the supplied option values and leftover arguments are
|
|
valid. Returns the option values and leftover arguments
|
|
(possibly adjusted, possibly completely new -- whatever you
|
|
like). Default implementation just returns the passed-in
|
|
values; subclasses may override as desired.
|
|
"""
|
|
return (values, args)
|
|
|
|
def _process_args(self, largs, rargs, values):
|
|
"""_process_args(largs : [string],
|
|
rargs : [string],
|
|
values : Values)
|
|
|
|
Process command-line arguments and populate 'values', consuming
|
|
options and arguments from 'rargs'. If 'allow_interspersed_args' is
|
|
false, stop at the first non-option argument. If true, accumulate any
|
|
interspersed non-option arguments in 'largs'.
|
|
"""
|
|
while rargs:
|
|
arg = rargs[0]
|
|
# We handle bare "--" explicitly, and bare "-" is handled by the
|
|
# standard arg handler since the short arg case ensures that the
|
|
# len of the opt string is greater than 1.
|
|
if arg == "--":
|
|
del rargs[0]
|
|
return
|
|
elif arg[0:2] == "--":
|
|
# process a single long option (possibly with value(s))
|
|
self._process_long_opt(rargs, values)
|
|
elif arg[:1] == "-" and len(arg) > 1:
|
|
# process a cluster of short options (possibly with
|
|
# value(s) for the last one only)
|
|
self._process_short_opts(rargs, values)
|
|
elif self.allow_interspersed_args:
|
|
largs.append(arg)
|
|
del rargs[0]
|
|
else:
|
|
return # stop now, leave this arg in rargs
|
|
|
|
# Say this is the original argument list:
|
|
# [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)]
|
|
# ^
|
|
# (we are about to process arg(i)).
|
|
#
|
|
# Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of
|
|
# [arg0, ..., arg(i-1)] (any options and their arguments will have
|
|
# been removed from largs).
|
|
#
|
|
# The while loop will usually consume 1 or more arguments per pass.
|
|
# If it consumes 1 (eg. arg is an option that takes no arguments),
|
|
# then after _process_arg() is done the situation is:
|
|
#
|
|
# largs = subset of [arg0, ..., arg(i)]
|
|
# rargs = [arg(i+1), ..., arg(N-1)]
|
|
#
|
|
# If allow_interspersed_args is false, largs will always be
|
|
# *empty* -- still a subset of [arg0, ..., arg(i-1)], but
|
|
# not a very interesting subset!
|
|
|
|
def _match_long_opt(self, opt):
|
|
"""_match_long_opt(opt : string) -> string
|
|
|
|
Determine which long option string 'opt' matches, ie. which one
|
|
it is an unambiguous abbrevation for. Raises BadOptionError if
|
|
'opt' doesn't unambiguously match any long option string.
|
|
"""
|
|
return _match_abbrev(opt, self._long_opt)
|
|
|
|
def _process_long_opt(self, rargs, values):
|
|
arg = rargs.pop(0)
|
|
|
|
# Value explicitly attached to arg? Pretend it's the next
|
|
# argument.
|
|
if "=" in arg:
|
|
(opt, next_arg) = string.split(arg, "=", 1)
|
|
rargs.insert(0, next_arg)
|
|
had_explicit_value = True
|
|
else:
|
|
opt = arg
|
|
had_explicit_value = False
|
|
|
|
opt = self._match_long_opt(opt)
|
|
option = self._long_opt[opt]
|
|
if option.takes_value():
|
|
nargs = option.nargs
|
|
if len(rargs) < nargs:
|
|
if nargs == 1:
|
|
self.error(_("%s option requires an argument") % opt)
|
|
else:
|
|
self.error(_("%s option requires %d arguments")
|
|
% (opt, nargs))
|
|
elif nargs == 1:
|
|
value = rargs.pop(0)
|
|
else:
|
|
value = tuple(rargs[0:nargs])
|
|
del rargs[0:nargs]
|
|
|
|
elif had_explicit_value:
|
|
self.error(_("%s option does not take a value") % opt)
|
|
|
|
else:
|
|
value = None
|
|
|
|
option.process(opt, value, values, self)
|
|
|
|
def _process_short_opts(self, rargs, values):
|
|
arg = rargs.pop(0)
|
|
stop = False
|
|
i = 1
|
|
for ch in arg[1:]:
|
|
opt = "-" + ch
|
|
option = self._short_opt.get(opt)
|
|
i = i+1 # we have consumed a character
|
|
|
|
if not option:
|
|
raise errors.BadOptionError(opt)
|
|
#self.error(_("no such option: %s") % opt)
|
|
if option.takes_value():
|
|
# Any characters left in arg? Pretend they're the
|
|
# next arg, and stop consuming characters of arg.
|
|
if i < len(arg):
|
|
rargs.insert(0, arg[i:])
|
|
stop = True
|
|
|
|
nargs = option.nargs
|
|
if len(rargs) < nargs:
|
|
if nargs == 1:
|
|
self.error(_("%s option requires an argument") % opt)
|
|
else:
|
|
self.error(_("%s option requires %d arguments")
|
|
% (opt, nargs))
|
|
elif nargs == 1:
|
|
value = rargs.pop(0)
|
|
else:
|
|
value = tuple(rargs[0:nargs])
|
|
del rargs[0:nargs]
|
|
|
|
else: # option doesn't take a value
|
|
value = None
|
|
|
|
option.process(opt, value, values, self)
|
|
|
|
if stop:
|
|
break
|
|
|
|
|
|
# -- Feedback methods ----------------------------------------------
|
|
|
|
def get_prog_name(self):
|
|
if self.prog is None:
|
|
return os.path.basename(sys.argv[0])
|
|
else:
|
|
return self.prog
|
|
|
|
def expand_prog_name(self, s):
|
|
return string.replace(s, "%prog", self.get_prog_name())
|
|
|
|
def get_description(self):
|
|
return self.expand_prog_name(self.description)
|
|
|
|
def exit(self, status=0, msg=None):
|
|
if msg:
|
|
sys.stderr.write(msg)
|
|
sys.exit(status)
|
|
|
|
def error(self, msg):
|
|
"""error(msg : string)
|
|
|
|
Print a usage message incorporating 'msg' to stderr and exit.
|
|
If you override this in a subclass, it should not return -- it
|
|
should either exit or raise an exception.
|
|
"""
|
|
self.print_usage(sys.stderr)
|
|
self.exit(2, "%s: error: %s\n" % (self.get_prog_name(), msg))
|
|
|
|
def get_usage(self):
|
|
if self.usage:
|
|
return self.formatter.format_usage(
|
|
self.expand_prog_name(self.usage))
|
|
else:
|
|
return ""
|
|
|
|
def print_usage(self, file=None):
|
|
"""print_usage(file : file = stdout)
|
|
|
|
Print the usage message for the current program (self.usage) to
|
|
'file' (default stdout). Any occurence of the string "%prog" in
|
|
self.usage is replaced with the name of the current program
|
|
(basename of sys.argv[0]). Does nothing if self.usage is empty
|
|
or not defined.
|
|
"""
|
|
if self.usage:
|
|
if file is None:
|
|
file = sys.stdout
|
|
file.write(self.get_usage() + "\n")
|
|
|
|
def get_version(self):
|
|
if self.version:
|
|
return self.expand_prog_name(self.version)
|
|
else:
|
|
return ""
|
|
|
|
def print_version(self, file=None):
|
|
"""print_version(file : file = stdout)
|
|
|
|
Print the version message for this program (self.version) to
|
|
'file' (default stdout). As with print_usage(), any occurence
|
|
of "%prog" in self.version is replaced by the current program's
|
|
name. Does nothing if self.version is empty or undefined.
|
|
"""
|
|
if self.version:
|
|
if file is None:
|
|
file = sys.stdout
|
|
file.write(self.get_version() + "\n")
|
|
|
|
def format_option_help(self, formatter=None):
|
|
if formatter is None:
|
|
formatter = self.formatter
|
|
formatter.store_option_strings(self)
|
|
result = []
|
|
result.append(formatter.format_heading(_("options")))
|
|
formatter.indent()
|
|
if self.option_list:
|
|
result.append(OptionContainer.format_option_help(self, formatter))
|
|
result.append("\n")
|
|
for group in self.option_groups:
|
|
result.append(group.format_help(formatter))
|
|
result.append("\n")
|
|
formatter.dedent()
|
|
# Drop the last "\n", or the header if no options or option groups:
|
|
return string.join(result[:-1], "")
|
|
|
|
def format_help(self, formatter=None):
|
|
if formatter is None:
|
|
formatter = self.formatter
|
|
result = []
|
|
if self.usage:
|
|
result.append(self.get_usage() + "\n")
|
|
if self.description:
|
|
result.append(self.format_description(formatter) + "\n")
|
|
result.append(self.format_option_help(formatter))
|
|
return string.join(result, "")
|
|
|
|
def print_help(self, file=None):
|
|
"""print_help(file : file = stdout)
|
|
|
|
Print an extended help message, listing all options and any
|
|
help text provided with them, to 'file' (default stdout).
|
|
"""
|
|
if file is None:
|
|
file = sys.stdout
|
|
file.write(self.format_help())
|
|
|
|
# class OptionParser
|
|
|
|
|
|
def _match_abbrev(s, wordmap):
|
|
"""_match_abbrev(s : string, wordmap : {string : Option}) -> string
|
|
|
|
Return the string key in 'wordmap' for which 's' is an unambiguous
|
|
abbreviation. If 's' is found to be ambiguous or doesn't match any of
|
|
'words', raise BadOptionError.
|
|
"""
|
|
# Is there an exact match?
|
|
if wordmap.has_key(s):
|
|
return s
|
|
else:
|
|
# Isolate all words with s as a prefix.
|
|
possibilities = []
|
|
for word in wordmap.keys():
|
|
if string.startswith(word, s):
|
|
possibilities.append(word)
|
|
# No exact match, so there had better be just one possibility.
|
|
if len(possibilities) == 1:
|
|
return possibilities[0]
|
|
elif not possibilities:
|
|
raise errors.BadOptionError(s)
|
|
else:
|
|
# More than one possible completion: ambiguous prefix.
|
|
raise errors.AmbiguousOptionError(s, possibilities)
|