Hefty refactoring: converted 'fancy_getopt()' function into FancyGetopt
class. (Mainly this was to support the ability to go back after the getopt operation is done and get extra information about the parse, in particular the original order of options seen on the command line. But it's a big improvement and should make it a lot easier to add functionality in the future.)
This commit is contained in:
Greg Ward
parent
d5767a5e43
commit
ffc10d9a2e
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@ -27,11 +27,244 @@ longopt_re = re.compile (r'^%s$' % longopt_pat)
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# For recognizing "negative alias" options, eg. "quiet=!verbose"
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neg_alias_re = re.compile ("^(%s)=!(%s)$" % (longopt_pat, longopt_pat))
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# This is used to translate long options to legitimate Python identifiers
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# (for use as attributes of some object).
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longopt_xlate = string.maketrans ('-', '_')
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# This records (option, value) pairs in the order seen on the command line;
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# it's close to what getopt.getopt() returns, but with short options
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# expanded. (Ugh, this module should be OO-ified.)
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_option_order = None
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class FancyGetopt:
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"""Wrapper around the standard 'getopt()' module that provides some
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handy extra functionality:
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* short and long options are tied together
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* options have help strings, and help text can be assembled
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from them
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* options set attributes of a passed-in object
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* boolean options can have "negative aliases" -- eg. if
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--quiet is the "negative alias" of --verbose, then "--quiet"
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on the command line sets 'verbose' to false
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"""
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def __init__ (self, option_table=None):
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# The option table is (currently) a list of 3-tuples:
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# (long_option, short_option, help_string)
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# if an option takes an argument, its long_option should have '='
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# appended; short_option should just be a single character, no ':'
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# in any case. If a long_option doesn't have a corresponding
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# short_option, short_option should be None. All option tuples
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# must have long options.
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self.option_table = option_table
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# 'option_index' maps long option names to entries in the option
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# table (ie. those 3-tuples).
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self.option_index = {}
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if self.option_table:
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self.build_index()
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# 'negative_alias' keeps track of options that are the boolean
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# opposite of some other option
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self.negative_alias = {}
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# These keep track of the information in the option table. We
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# don't actually populate these structures until we're ready to
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# parse the command-line, since the 'option_table' passed in here
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# isn't necessarily the final word.
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self.short_opts = []
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self.long_opts = []
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self.short2long = {}
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self.attr_name = {}
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self.takes_arg = {}
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# And 'option_order' is filled up in 'getopt()'; it records the
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# original order of options (and their values) on the command-line,
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# but expands short options, converts aliases, etc.
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self.option_order = []
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# __init__ ()
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def build_index (self):
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for option in self.option_table:
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self.option_index[option[0]] = option
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def add_option (self, long_option, short_option=None, help_string=None):
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if self.option_index.has_key(long_option):
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raise DistutilsGetoptError, \
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"option conflict: already an option '%s'" % long_option
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else:
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option = (long_option, short_option, help_string)
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self.option_table.append (option)
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self.option_index[long_option] = option
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def set_negative_aliases (self, negative_alias):
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"""Set the negative aliases for this option parser.
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'negative_alias' should be a dictionary mapping option names to
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option names, both the key and value must already be defined
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in the option table."""
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assert type(negative_alias) is DictionaryType
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for (negopt, opt) in negative_alias.items():
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if not self.option_index.has_key(negopt):
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raise DistutilsGetoptError, \
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("invalid negative alias '%s': "
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"option '%s' not defined") % (negopt, negopt)
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if not self.option_index.has_key(opt):
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raise DistutilsGetoptError, \
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("invalid negative alias '%s': "
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"aliased option '%s' not defined") % (negopt, opt)
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self.negative_alias = negative_alias
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def _grok_option_table (self):
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"""Populate the various data structures that keep tabs on
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the option table. Called by 'getopt()' before it can do
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anything worthwhile."""
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for option in self.option_table:
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try:
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(long, short, help) = option
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except ValueError:
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raise DistutilsGetoptError, \
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"invalid option tuple " + str (option)
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# Type- and value-check the option names
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if type(long) is not StringType or len(long) < 2:
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raise DistutilsGetoptError, \
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("invalid long option '%s': "
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"must be a string of length >= 2") % long
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if (not ((short is None) or
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(type (short) is StringType and len (short) == 1))):
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raise DistutilsGetoptError, \
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("invalid short option '%s': "
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"must a single character or None") % short
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self.long_opts.append (long)
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if long[-1] == '=': # option takes an argument?
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if short: short = short + ':'
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long = long[0:-1]
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self.takes_arg[long] = 1
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else:
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# Is option is a "negative alias" for some other option (eg.
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# "quiet" == "!verbose")?
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alias_to = self.negative_alias.get(long)
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if alias_to is not None:
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if self.takes_arg[alias_to]:
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raise DistutilsGetoptError, \
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("invalid negative alias '%s': "
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"aliased option '%s' takes a value") % \
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(long, alias_to)
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self.long_opts[-1] = long # XXX redundant?!
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self.takes_arg[long] = 0
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else:
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self.takes_arg[long] = 0
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# Now enforce some bondage on the long option name, so we can
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# later translate it to an attribute name on some object. Have
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# to do this a bit late to make sure we've removed any trailing
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# '='.
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if not longopt_re.match (long):
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raise DistutilsGetoptError, \
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("invalid long option name '%s' " +
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"(must be letters, numbers, hyphens only") % long
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self.attr_name[long] = string.translate (long, longopt_xlate)
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if short:
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self.short_opts.append (short)
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self.short2long[short[0]] = long
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# for option_table
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# _grok_option_table()
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def getopt (self, args=None, object=None):
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"""Parse the command-line options in 'args' and store the results
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as attributes of 'object'. If 'args' is None or not supplied, uses
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'sys.argv[1:]'. If 'object' is None or not supplied, creates a new
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OptionDummy object, stores option values there, and returns a tuple
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(args, object). If 'object' is supplied, it is modified in place
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and 'getopt()' just returns 'args'; in both cases, the returned
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'args' is a modified copy of the passed-in 'args' list, which is
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left untouched."""
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if args is None:
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args = sys.argv[1:]
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if object is None:
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object = OptionDummy()
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created_object = 1
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else:
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created_object = 0
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self._grok_option_table()
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short_opts = string.join (self.short_opts)
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try:
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(opts, args) = getopt.getopt (args, short_opts, self.long_opts)
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except getopt.error, msg:
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raise DistutilsArgError, msg
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for (opt, val) in opts:
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if len (opt) == 2 and opt[0] == '-': # it's a short option
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opt = self.short2long[opt[1]]
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elif len (opt) > 2 and opt[0:2] == '--':
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opt = opt[2:]
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else:
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raise DistutilsInternalError, \
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"this can't happen: bad option string '%s'" % opt
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if not self.takes_arg[opt]: # boolean option?
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if val != '': # shouldn't have a value!
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raise DistutilsInternalError, \
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"this can't happen: bad option value '%s'" % value
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alias = self.negative_alias.get (opt)
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if alias:
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opt = alias
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val = 0
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else:
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val = 1
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attr = self.attr_name[opt]
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setattr (object, attr, val)
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self.option_order.append ((opt, val))
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# for opts
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if created_object:
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return (args, object)
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else:
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return args
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# getopt()
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def get_option_order ():
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"""Returns the list of (option, value) tuples processed by the
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previous run of 'fancy_getopt()'. Raises RuntimeError if
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'fancy_getopt()' hasn't been called yet."""
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if self.option_order is None:
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raise RuntimeError, "'fancy_getopt()' hasn't been called yet"
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else:
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return self.option_order
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# class FancyGetopt
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def fancy_getopt (options, negative_opt, object, args):
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@ -117,6 +350,9 @@ def fancy_getopt (options, negative_opt, object, args):
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except getopt.error, msg:
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raise DistutilsArgError, msg
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global _option_order # blechh! should OO-ify this module
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_option_order = []
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for (opt, val) in opts:
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if len (opt) == 2 and opt[0] == '-': # it's a short option
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opt = short2long[opt[1]]
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@ -125,29 +361,38 @@ def fancy_getopt (options, negative_opt, object, args):
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opt = opt[2:]
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else:
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raise RuntimeError, "getopt lies! (bad option string '%s')" % \
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opt
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raise DistutilsInternalError, \
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"this can't happen: bad option string '%s'" % opt
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if not takes_arg[opt]: # boolean option?
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if val != '': # shouldn't have a value!
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raise DistutilsInternalError, \
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"this can't happen: bad option value '%s'" % value
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alias = negative_opt.get (opt)
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if alias:
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opt = alias
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val = 0
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else:
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val = 1
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attr = attr_name[opt]
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if takes_arg[opt]:
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setattr (object, attr, val)
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else:
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if val == '':
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alias = negative_opt.get (opt)
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if alias:
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setattr (object, attr_name[alias], 0)
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else:
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setattr (object, attr, 1)
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else:
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raise RuntimeError, "getopt lies! (bad value '%s')" % value
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setattr (object, attr, val)
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_option_order.append ((opt, val))
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# end loop over options found in 'args'
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# for opts
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return args
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# fancy_getopt()
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def fancy_getopt (options, negative_opt, object, args):
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parser = FancyGetopt (options)
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parser.set_negative_aliases (negative_opt)
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return parser.getopt (args, object)
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WS_TRANS = string.maketrans (string.whitespace, ' ' * len (string.whitespace))
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def wrap_text (text, width):
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@ -296,6 +541,12 @@ def print_help (options, file=None, header=None):
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for line in generate_help (options, header):
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file.write (line + "\n")
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# print_help ()
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class OptionDummy:
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"""Dummy class just used as a place to hold command-line option
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values as instance attributes."""
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pass
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if __name__ == "__main__":
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