Close http://www.scipy.net/roundup/ipython/issue34 with slightly modified

patch (filter non-strings from tab completions).

IPython/FlexCompleter.py

@@ -1,198 +1,199 b''
 # -*- coding: utf-8 -*-
 """Word completion for GNU readline 2.0.
 
 ---------------------------------------------------------------------------
 NOTE: This version is a re-implementation of rlcompleter with selectable
 namespace.
 
 The problem with rlcompleter is that it's hardwired to work with
 __main__.__dict__, and in some cases one may have 'sandboxed' namespaces. So
 this class is a ripoff of rlcompleter, with the namespace to work in as an
 optional parameter.
 
 This class can be used just like rlcompleter, but the Completer class now has
 a constructor with the optional 'namespace' parameter.
 
 A patch has been submitted to Python@sourceforge for these changes to go in
 the standard Python distribution.
 
 The patch went in for Python 2.3.  Once IPython drops support for Python 2.2,
 this file can be significantly reduced.
 ---------------------------------------------------------------------------
 
 Original rlcompleter documentation:
 
 This requires the latest extension to the readline module (the
 completes keywords, built-ins and globals in __main__; when completing
 NAME.NAME..., it evaluates (!) the expression up to the last dot and
 completes its attributes.
 
 It's very cool to do "import string" type "string.", hit the
 completion key (twice), and see the list of names defined by the
 string module!
 
 Tip: to use the tab key as the completion key, call
 
     readline.parse_and_bind("tab: complete")
 
 Notes:
 
 - Exceptions raised by the completer function are *ignored* (and
 generally cause the completion to fail).  This is a feature -- since
 readline sets the tty device in raw (or cbreak) mode, printing a
 traceback wouldn't work well without some complicated hoopla to save,
 reset and restore the tty state.
 
 - The evaluation of the NAME.NAME... form may cause arbitrary
 application defined code to be executed if an object with a
 __getattr__ hook is found.  Since it is the responsibility of the
 application (or the user) to enable this feature, I consider this an
 acceptable risk.  More complicated expressions (e.g. function calls or
 indexing operations) are *not* evaluated.
 
 - GNU readline is also used by the built-in functions input() and
 raw_input(), and thus these also benefit/suffer from the completer
 features.  Clearly an interactive application can benefit by
 specifying its own completer function and using raw_input() for all
 its input.
 
 - When the original stdin is not a tty device, GNU readline is never
 used, and this module (and the readline module) are silently inactive.
 
 """
 
 #*****************************************************************************
 #
 # Since this file is essentially a minimally modified copy of the rlcompleter
 # module which is part of the standard Python distribution, I assume that the
 # proper procedure is to maintain its copyright as belonging to the Python
 # Software Foundation:
 #
 #       Copyright (C) 2001 Python Software Foundation, www.python.org
 #
 #  Distributed under the terms of the Python Software Foundation license.
 #
 #  Full text available at:
 #
 #                  http://www.python.org/2.1/license.html
 #
 #*****************************************************************************
 
 import readline
 import __builtin__
 import __main__
 
 __all__ = ["Completer"]
 
+# declares Python 2.2 compatibility symbols:
+try:
+    basestring
+except NameError:
+    import types
+    basestring = (types.StringType, types.UnicodeType)
+
 class Completer:
     def __init__(self, namespace = None):
         """Create a new completer for the command line.
 
         Completer([namespace]) -> completer instance.
 
         If unspecified, the default namespace where completions are performed
         is __main__ (technically, __main__.__dict__). Namespaces should be
         given as dictionaries.
 
         Completer instances should be used as the completion mechanism of
         readline via the set_completer() call:
 
         readline.set_completer(Completer(my_namespace).complete)
         """
         
         if namespace and type(namespace) != type({}):
             raise TypeError,'namespace must be a dictionary'
 
         # Don't bind to namespace quite yet, but flag whether the user wants a
         # specific namespace or to use __main__.__dict__. This will allow us
         # to bind to __main__.__dict__ at completion time, not now.
         if namespace is None:
             self.use_main_ns = 1
         else:
             self.use_main_ns = 0
             self.namespace = namespace
 
     def complete(self, text, state):
         """Return the next possible completion for 'text'.
 
         This is called successively with state == 0, 1, 2, ... until it
         returns None.  The completion should begin with 'text'.
 
         """
         if self.use_main_ns:
             self.namespace = __main__.__dict__
             
         if state == 0:
             if "." in text:
                 self.matches = self.attr_matches(text)
             else:
                 self.matches = self.global_matches(text)
         try:
             return self.matches[state]
         except IndexError:
             return None
 
     def global_matches(self, text):
         """Compute matches when text is a simple name.
 
         Return a list of all keywords, built-in functions and names currently
         defined in self.namespace that match.
 
         """
         import keyword
         matches = []
         n = len(text)
         for list in [keyword.kwlist,
                      __builtin__.__dict__.keys(),
                      self.namespace.keys()]:
             for word in list:
                 if word[:n] == text and word != "__builtins__":
                     matches.append(word)
         return matches
 
     def attr_matches(self, text):
         """Compute matches when text contains a dot.
 
         Assuming the text is of the form NAME.NAME....[NAME], and is
         evaluatable in self.namespace, it will be evaluated and its attributes
         (as revealed by dir()) are used as possible completions.  (For class
         instances, class members are are also considered.)
 
         WARNING: this can still invoke arbitrary C code, if an object
         with a __getattr__ hook is evaluated.
 
         """
         import re
 
         # Another option, seems to work great. Catches things like ''.<tab>
         m = re.match(r"(\S+(\.\w+)*)\.(\w*)$", text)
 
         if not m:
             return []
         expr, attr = m.group(1, 3)
         object = eval(expr, self.namespace)
-        words = dir(object)
+        words = [w for w in dir(object) if isinstance(w, basestring)]
         if hasattr(object,'__class__'):
             words.append('__class__')
             words.extend(get_class_members(object.__class__))
         n = len(attr)
         matches = []
         for word in words:
-            try:
                 if word[:n] == attr and word != "__builtins__":
                     matches.append("%s.%s" % (expr, word))
-            except:
-                # some badly behaved objects pollute dir() with non-strings,
-                # which cause the completion to fail.  This way we skip the
-                # bad entries and can still continue processing the others.
-                pass
         return matches
 
 def get_class_members(klass):
     ret = dir(klass)
     if hasattr(klass,'__bases__'):
         for base in klass.__bases__:
             ret.extend(get_class_members(base))
     return ret
 
 readline.set_completer(Completer().complete)