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65230a2de7
x in string.whitespace => x.isspace() type(x) in types.StringTypes => isinstance(x, basestring) isinstance(x, types.StringTypes) => isinstance(x, basestring) type(x) is types.StringType => isinstance(x, str) type(x) == types.StringType => isinstance(x, str) string.split(x, ...) => x.split(...) string.join(x, y) => y.join(x) string.zfill(x, ...) => x.zfill(...) string.count(x, ...) => x.count(...) hasattr(types, "UnicodeType") => try: unicode except NameError: type(x) != types.TupleTuple => not isinstance(x, tuple) isinstance(x, types.TupleType) => isinstance(x, tuple) type(x) is types.IntType => isinstance(x, int) Do not mention the string module in the rlcompleter docstring. This partially applies SF patch http://www.python.org/sf/562373 (with basestring instead of string). (It excludes the changes to unittest.py and does not change the os.stat stuff.)
151 lines
5.1 KiB
Python
151 lines
5.1 KiB
Python
"""Word completion for GNU readline 2.0.
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This requires the latest extension to the readline module. The completer
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completes keywords, built-ins and globals in a selectable namespace (which
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defaults to __main__); when completing NAME.NAME..., it evaluates (!) the
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expression up to the last dot and completes its attributes.
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It's very cool to do "import sys" type "sys.", hit the
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completion key (twice), and see the list of names defined by the
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sys module!
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Tip: to use the tab key as the completion key, call
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readline.parse_and_bind("tab: complete")
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Notes:
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- Exceptions raised by the completer function are *ignored* (and
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generally cause the completion to fail). This is a feature -- since
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readline sets the tty device in raw (or cbreak) mode, printing a
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traceback wouldn't work well without some complicated hoopla to save,
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reset and restore the tty state.
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- The evaluation of the NAME.NAME... form may cause arbitrary
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application defined code to be executed if an object with a
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__getattr__ hook is found. Since it is the responsibility of the
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application (or the user) to enable this feature, I consider this an
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acceptable risk. More complicated expressions (e.g. function calls or
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indexing operations) are *not* evaluated.
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- GNU readline is also used by the built-in functions input() and
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raw_input(), and thus these also benefit/suffer from the completer
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features. Clearly an interactive application can benefit by
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specifying its own completer function and using raw_input() for all
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its input.
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- When the original stdin is not a tty device, GNU readline is never
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used, and this module (and the readline module) are silently inactive.
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"""
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import readline
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import __builtin__
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import __main__
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__all__ = ["Completer"]
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class Completer:
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def __init__(self, namespace = None):
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"""Create a new completer for the command line.
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Completer([namespace]) -> completer instance.
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If unspecified, the default namespace where completions are performed
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is __main__ (technically, __main__.__dict__). Namespaces should be
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given as dictionaries.
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Completer instances should be used as the completion mechanism of
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readline via the set_completer() call:
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readline.set_completer(Completer(my_namespace).complete)
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"""
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if namespace and not isinstance(namespace, dict):
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raise TypeError,'namespace must be a dictionary'
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# Don't bind to namespace quite yet, but flag whether the user wants a
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# specific namespace or to use __main__.__dict__. This will allow us
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# to bind to __main__.__dict__ at completion time, not now.
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if namespace is None:
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self.use_main_ns = 1
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else:
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self.use_main_ns = 0
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self.namespace = namespace
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def complete(self, text, state):
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"""Return the next possible completion for 'text'.
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This is called successively with state == 0, 1, 2, ... until it
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returns None. The completion should begin with 'text'.
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"""
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if self.use_main_ns:
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self.namespace = __main__.__dict__
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if state == 0:
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if "." in text:
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self.matches = self.attr_matches(text)
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else:
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self.matches = self.global_matches(text)
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try:
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return self.matches[state]
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except IndexError:
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return None
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def global_matches(self, text):
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"""Compute matches when text is a simple name.
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Return a list of all keywords, built-in functions and names currently
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defined in self.namespace that match.
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"""
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import keyword
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matches = []
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n = len(text)
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for list in [keyword.kwlist,
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__builtin__.__dict__,
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self.namespace]:
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for word in list:
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if word[:n] == text and word != "__builtins__":
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matches.append(word)
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return matches
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def attr_matches(self, text):
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"""Compute matches when text contains a dot.
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Assuming the text is of the form NAME.NAME....[NAME], and is
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evaluatable in self.namespace, it will be evaluated and its attributes
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(as revealed by dir()) are used as possible completions. (For class
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instances, class members are are also considered.)
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WARNING: this can still invoke arbitrary C code, if an object
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with a __getattr__ hook is evaluated.
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"""
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import re
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m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
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if not m:
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return
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expr, attr = m.group(1, 3)
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object = eval(expr, self.namespace)
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words = dir(object)
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if hasattr(object,'__class__'):
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words.append('__class__')
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words = words + get_class_members(object.__class__)
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matches = []
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n = len(attr)
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for word in words:
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if word[:n] == attr and word != "__builtins__":
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matches.append("%s.%s" % (expr, word))
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return matches
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def get_class_members(klass):
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ret = dir(klass)
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if hasattr(klass,'__bases__'):
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for base in klass.__bases__:
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ret = ret + get_class_members(base)
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return ret
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readline.set_completer(Completer().complete)
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