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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">&quot;&quot;&quot;Word completion for GNU readline.

The completer completes keywords, built-ins and globals in a selectable
namespace (which defaults to __main__); when completing NAME.NAME..., it
evaluates (!) the expression up to the last dot and completes its attributes.

It&#039;s very cool to do &quot;import sys&quot; type &quot;sys.&quot;, hit the completion key (twice),
and see the list of names defined by the sys module!

Tip: to use the tab key as the completion key, call

    readline.parse_and_bind(&quot;tab: complete&quot;)

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&#039;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.

- When the original stdin is not a tty device, GNU readline is never
  used, and this module (and the readline module) are silently inactive.

&quot;&quot;&quot;

import atexit
import builtins
import __main__

__all__ = [&quot;Completer&quot;]

class Completer:
    def __init__(self, namespace = None):
        &quot;&quot;&quot;Create a new completer for the command line.

        Completer([namespace]) -&gt; 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)
        &quot;&quot;&quot;

        if namespace and not isinstance(namespace, dict):
            raise TypeError(&#039;namespace must be a dictionary&#039;)

        # Don&#039;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):
        &quot;&quot;&quot;Return the next possible completion for &#039;text&#039;.

        This is called successively with state == 0, 1, 2, ... until it
        returns None.  The completion should begin with &#039;text&#039;.

        &quot;&quot;&quot;
        if self.use_main_ns:
            self.namespace = __main__.__dict__

        if not text.strip():
            if state == 0:
                if _readline_available:
                    readline.insert_text(&#039;\t&#039;)
                    readline.redisplay()
                    return &#039;&#039;
                else:
                    return &#039;\t&#039;
            else:
                return None

        if state == 0:
            if &quot;.&quot; 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 _callable_postfix(self, val, word):
        if callable(val):
            word = word + &quot;(&quot;
        return word

    def global_matches(self, text):
        &quot;&quot;&quot;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.

        &quot;&quot;&quot;
        import keyword
        matches = []
        seen = {&quot;__builtins__&quot;}
        n = len(text)
        for word in keyword.kwlist:
            if word[:n] == text:
                seen.add(word)
                if word in {&#039;finally&#039;, &#039;try&#039;}:
                    word = word + &#039;:&#039;
                elif word not in {&#039;False&#039;, &#039;None&#039;, &#039;True&#039;,
                                  &#039;break&#039;, &#039;continue&#039;, &#039;pass&#039;,
                                  &#039;else&#039;}:
                    word = word + &#039; &#039;
                matches.append(word)
        for nspace in [self.namespace, builtins.__dict__]:
            for word, val in nspace.items():
                if word[:n] == text and word not in seen:
                    seen.add(word)
                    matches.append(self._callable_postfix(val, word))
        return matches

    def attr_matches(self, text):
        &quot;&quot;&quot;Compute matches when text contains a dot.

        Assuming the text is of the form NAME.NAME....[NAME], and is
        evaluable 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 also considered.)

        WARNING: this can still invoke arbitrary C code, if an object
        with a __getattr__ hook is evaluated.

        &quot;&quot;&quot;
        import re
        m = re.match(r&quot;(\w+(\.\w+)*)\.(\w*)&quot;, text)
        if not m:
            return []
        expr, attr = m.group(1, 3)
        try:
            thisobject = eval(expr, self.namespace)
        except Exception:
            return []

        # get the content of the object, except __builtins__
        words = set(dir(thisobject))
        words.discard(&quot;__builtins__&quot;)

        if hasattr(thisobject, &#039;__class__&#039;):
            words.add(&#039;__class__&#039;)
            words.update(get_class_members(thisobject.__class__))
        matches = []
        n = len(attr)
        if attr == &#039;&#039;:
            noprefix = &#039;_&#039;
        elif attr == &#039;_&#039;:
            noprefix = &#039;__&#039;
        else:
            noprefix = None
        while True:
            for word in words:
                if (word[:n] == attr and
                    not (noprefix and word[:n+1] == noprefix)):
                    match = &quot;%s.%s&quot; % (expr, word)
                    try:
                        val = getattr(thisobject, word)
                    except Exception:
                        pass  # Include even if attribute not set
                    else:
                        match = self._callable_postfix(val, match)
                    matches.append(match)
            if matches or not noprefix:
                break
            if noprefix == &#039;_&#039;:
                noprefix = &#039;__&#039;
            else:
                noprefix = None
        matches.sort()
        return matches

def get_class_members(klass):
    ret = dir(klass)
    if hasattr(klass,&#039;__bases__&#039;):
        for base in klass.__bases__:
            ret = ret + get_class_members(base)
    return ret

try:
    import readline
except ImportError:
    _readline_available = False
else:
    readline.set_completer(Completer().complete)
    # Release references early at shutdown (the readline module&#039;s
    # contents are quasi-immortal, and the completer function holds a
    # reference to globals).
    atexit.register(lambda: readline.set_completer(None))
    _readline_available = True
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