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Diffstat (limited to 'Cheetah/Utils/optik/option.py')
| -rw-r--r-- | Cheetah/Utils/optik/option.py | 354 |
1 files changed, 0 insertions, 354 deletions
diff --git a/Cheetah/Utils/optik/option.py b/Cheetah/Utils/optik/option.py deleted file mode 100644 index 50ce732a7..000000000 --- a/Cheetah/Utils/optik/option.py +++ /dev/null @@ -1,354 +0,0 @@ -"""optik.option - -Defines the Option class and some standard value-checking functions. - -Cheetah modifications: added "Cheetah.Utils.optik." prefix to - all intra-Optik imports. -""" - -__revision__ = "$Id: option.py,v 1.1 2006/12/18 23:09:06 dwelch Exp $" - -# Copyright (c) 2001 Gregory P. Ward. All rights reserved. -# See the README.txt distributed with Optik for licensing terms. - -# created 2001/10/17, GPW (from optik.py) - -import sys -from types import TupleType, DictType -from Cheetah.Utils.optik.errors import OptionError, OptionValueError - -_builtin_cvt = { "int" : (int, "integer"), - "long" : (long, "long integer"), - "float" : (float, "floating-point"), - "complex" : (complex, "complex") } - -def check_builtin (option, opt, value): - (cvt, what) = _builtin_cvt[option.type] - try: - return cvt(value) - except ValueError: - raise OptionValueError( - #"%s: invalid %s argument %r" % (opt, what, value)) - "option %s: invalid %s value: %r" % (opt, what, value)) - -# Not supplying a default is different from a default of None, -# so we need an explicit "not supplied" value. -NO_DEFAULT = "NO"+"DEFAULT" - - -class Option: - """ - Instance attributes: - _short_opts : [string] - _long_opts : [string] - - action : string - type : string - dest : string - default : any - nargs : int - const : any - callback : function - callback_args : (any*) - callback_kwargs : { string : any } - help : string - metavar : string - """ - - # The list of instance attributes that may be set through - # keyword args to the constructor. - ATTRS = ['action', - 'type', - 'dest', - 'default', - 'nargs', - 'const', - 'callback', - 'callback_args', - 'callback_kwargs', - 'help', - 'metavar'] - - # The set of actions allowed by option parsers. Explicitly listed - # here so the constructor can validate its arguments. - ACTIONS = ("store", - "store_const", - "store_true", - "store_false", - "append", - "count", - "callback", - "help", - "version") - - # The set of actions that involve storing a value somewhere; - # also listed just for constructor argument validation. (If - # the action is one of these, there must be a destination.) - STORE_ACTIONS = ("store", - "store_const", - "store_true", - "store_false", - "append", - "count") - - # The set of actions for which it makes sense to supply a value - # type, ie. where we expect an argument to this option. - TYPED_ACTIONS = ("store", - "append", - "callback") - - # The set of known types for option parsers. Again, listed here for - # constructor argument validation. - TYPES = ("string", "int", "long", "float", "complex") - - # Dictionary of argument checking functions, which convert and - # validate option arguments according to the option type. - # - # Signature of checking functions is: - # check(option : Option, opt : string, value : string) -> any - # where - # option is the Option instance calling the checker - # opt is the actual option seen on the command-line - # (eg. "-a", "--file") - # value is the option argument seen on the command-line - # - # The return value should be in the appropriate Python type - # for option.type -- eg. an integer if option.type == "int". - # - # If no checker is defined for a type, arguments will be - # unchecked and remain strings. - TYPE_CHECKER = { "int" : check_builtin, - "long" : check_builtin, - "float" : check_builtin, - "complex" : check_builtin, - } - - - # CHECK_METHODS is a list of unbound method objects; they are called - # by the constructor, in order, after all attributes are - # initialized. The list is created and filled in later, after all - # the methods are actually defined. (I just put it here because I - # like to define and document all class attributes in the same - # place.) Subclasses that add another _check_*() method should - # define their own CHECK_METHODS list that adds their check method - # to those from this class. - CHECK_METHODS = None - - - # -- Constructor/initialization methods ---------------------------- - - def __init__ (self, *opts, **attrs): - # Set _short_opts, _long_opts attrs from 'opts' tuple - opts = self._check_opt_strings(opts) - self._set_opt_strings(opts) - - # Set all other attrs (action, type, etc.) from 'attrs' dict - self._set_attrs(attrs) - - # Check all the attributes we just set. There are lots of - # complicated interdependencies, but luckily they can be farmed - # out to the _check_*() methods listed in CHECK_METHODS -- which - # could be handy for subclasses! The one thing these all share - # is that they raise OptionError if they discover a problem. - for checker in self.CHECK_METHODS: - checker(self) - - def _check_opt_strings (self, opts): - # Filter out None because early versions of Optik had exactly - # one short option and one long option, either of which - # could be None. - opts = filter(None, opts) - if not opts: - raise OptionError("at least one option string must be supplied", - self) - return opts - - def _set_opt_strings (self, opts): - self._short_opts = [] - self._long_opts = [] - for opt in opts: - if len(opt) < 2: - raise OptionError( - "invalid option string %r: " - "must be at least two characters long" % opt, self) - elif len(opt) == 2: - if not (opt[0] == "-" and opt[1] != "-"): - raise OptionError( - "invalid short option string %r: " - "must be of the form -x, (x any non-dash char)" % opt, - self) - self._short_opts.append(opt) - else: - if not (opt[0:2] == "--" and opt[2] != "-"): - raise OptionError( - "invalid long option string %r: " - "must start with --, followed by non-dash" % opt, - self) - self._long_opts.append(opt) - - def _set_attrs (self, attrs): - for attr in self.ATTRS: - if attrs.has_key(attr): - setattr(self, attr, attrs[attr]) - del attrs[attr] - else: - if attr == 'default': - setattr(self, attr, NO_DEFAULT) - else: - setattr(self, attr, None) - if attrs: - raise OptionError( - "invalid keyword arguments: %s" % ", ".join(attrs.keys()), - self) - - - # -- Constructor validation methods -------------------------------- - - def _check_action (self): - if self.action is None: - self.action = "store" - elif self.action not in self.ACTIONS: - raise OptionError("invalid action: %r" % self.action, self) - - def _check_type (self): - if self.type is None: - # XXX should factor out another class attr here: list of - # actions that *require* a type - if self.action in ("store", "append"): - # No type given? "string" is the most sensible default. - self.type = "string" - else: - if self.type not in self.TYPES: - raise OptionError("invalid option type: %r" % self.type, self) - if self.action not in self.TYPED_ACTIONS: - raise OptionError( - "must not supply a type for action %r" % self.action, self) - - def _check_dest (self): - if self.action in self.STORE_ACTIONS and self.dest is None: - # No destination given, and we need one for this action. - # Glean a destination from the first long option string, - # or from the first short option string if no long options. - if self._long_opts: - # eg. "--foo-bar" -> "foo_bar" - self.dest = self._long_opts[0][2:].replace('-', '_') - else: - self.dest = self._short_opts[0][1] - - def _check_const (self): - if self.action != "store_const" and self.const is not None: - raise OptionError( - "'const' must not be supplied for action %r" % self.action, - self) - - def _check_nargs (self): - if self.action in self.TYPED_ACTIONS: - if self.nargs is None: - self.nargs = 1 - elif self.nargs is not None: - raise OptionError( - "'nargs' must not be supplied for action %r" % self.action, - self) - - def _check_callback (self): - if self.action == "callback": - if not callable(self.callback): - raise OptionError( - "callback not callable: %r" % self.callback, self) - if (self.callback_args is not None and - type(self.callback_args) is not TupleType): - raise OptionError( - "callback_args, if supplied, must be a tuple: not %r" - % self.callback_args, self) - if (self.callback_kwargs is not None and - type(self.callback_kwargs) is not DictType): - raise OptionError( - "callback_kwargs, if supplied, must be a dict: not %r" - % self.callback_kwargs, self) - else: - if self.callback is not None: - raise OptionError( - "callback supplied (%r) for non-callback option" - % self.callback, self) - if self.callback_args is not None: - raise OptionError( - "callback_args supplied for non-callback option", self) - if self.callback_kwargs is not None: - raise OptionError( - "callback_kwargs supplied for non-callback option", self) - - - CHECK_METHODS = [_check_action, - _check_type, - _check_dest, - _check_const, - _check_nargs, - _check_callback] - - - # -- Miscellaneous methods ----------------------------------------- - - def __str__ (self): - if self._short_opts or self._long_opts: - return "/".join(self._short_opts + self._long_opts) - else: - raise RuntimeError, "short_opts and long_opts both empty!" - - def takes_value (self): - return self.type is not None - - - # -- Processing methods -------------------------------------------- - - def check_value (self, opt, value): - checker = self.TYPE_CHECKER.get(self.type) - if checker is None: - return value - else: - return checker(self, opt, value) - - def process (self, opt, value, values, parser): - - # First, convert the value(s) to the right type. Howl if any - # value(s) are bogus. - if value is not None: - if self.nargs == 1: - value = self.check_value(opt, value) - else: - value = tuple([self.check_value(opt, v) for v in value]) - - # And then take whatever action is expected of us. - # This is a separate method to make life easier for - # subclasses to add new actions. - return self.take_action( - self.action, self.dest, opt, value, values, parser) - - def take_action (self, action, dest, opt, value, values, parser): - if action == "store": - setattr(values, dest, value) - elif action == "store_const": - setattr(values, dest, self.const) - elif action == "store_true": - setattr(values, dest, 1) - elif action == "store_false": - setattr(values, dest, 0) - elif action == "append": - values.ensure_value(dest, []).append(value) - elif action == "count": - setattr(values, dest, values.ensure_value(dest, 0) + 1) - elif action == "callback": - args = self.callback_args or () - kwargs = self.callback_kwargs or {} - self.callback(self, opt, value, parser, *args, **kwargs) - elif action == "help": - parser.print_help() - sys.exit(0) - elif action == "version": - parser.print_version() - sys.exit(0) - else: - raise RuntimeError, "unknown action %r" % self.action - - return 1 - -# class Option |