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0de65807e6
also modified check_all function to suppress all warnings since they aren't relevant to what this test is doing (allows quiet checking of regsub, for instance)
123 lines
4.0 KiB
Python
123 lines
4.0 KiB
Python
"""Word completion for GNU readline 2.0.
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This requires the latest extension to the readline module (the
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completes keywords, built-ins and globals in __main__; when completing
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NAME.NAME..., it evaluates (!) the expression up to the last dot and
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completes its attributes.
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It's very cool to do "import string" type "string.", hit the
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completion key (twice), and see the list of names defined by the
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string 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 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 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
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currently defines in __main__ 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__.keys(),
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__main__.__dict__.keys()]:
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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 the globals of __main__, it will be evaluated
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and its attributes (as revealed by dir()) are used as possible
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completions. (For class instances, class members are are also
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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, __main__.__dict__)
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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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