"""Word completion for IPython. This module is a fork of the rlcompleter module in the Python standard library. The original enhancements made to rlcompleter have been sent upstream and were accepted as of Python 2.3, but we need a lot more functionality specific to IPython, so this module will continue to live as an IPython-specific utility. --------------------------------------------------------------------------- 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 (in addition to my own, for all new code). # # Copyright (C) 2001 Python Software Foundation, www.python.org # Copyright (C) 2001-2005 Fernando Perez. # # Distributed under the terms of the BSD License. The full license is in # the file COPYING, distributed as part of this software. # #***************************************************************************** import __builtin__ import __main__ import glob import keyword import os import re import readline import sys import types # Python 2.4 offers sets as a builtin try: set([1,2]) except NameError: from sets import Set as set from IPython.genutils import shlex_split __all__ = ['Completer','IPCompleter'] def get_class_members(cls): ret = dir(cls) if hasattr(cls,'__bases__'): for base in cls.__bases__: ret.extend(get_class_members(base)) return ret class Completer: def __init__(self,namespace=None,global_namespace=None): """Create a new completer for the command line. Completer([namespace,global_namespace]) -> completer instance. If unspecified, the default namespace where completions are performed is __main__ (technically, __main__.__dict__). Namespaces should be given as dictionaries. An optional second namespace can be given. This allows the completer to handle cases where both the local and global scopes need to be distinguished. Completer instances should be used as the completion mechanism of readline via the set_completer() call: readline.set_completer(Completer(my_namespace).complete) """ # some minimal strict typechecks. For some core data structures, I # want actual basic python types, not just anything that looks like # one. This is especially true for namespaces. for ns in (namespace,global_namespace): if ns is not None and type(ns) != types.DictType: 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 # The global namespace, if given, can be bound directly if global_namespace is None: self.global_namespace = {} else: self.global_namespace = global_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 or self.global_namespace that match. """ matches = [] match_append = matches.append n = len(text) for lst in [keyword.kwlist, __builtin__.__dict__.keys(), self.namespace.keys(), self.global_namespace.keys()]: for word in lst: if word[:n] == text and word != "__builtins__": match_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 or self.global_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 ''. m = re.match(r"(\S+(\.\w+)*)\.(\w*)$", text) if not m: return [] expr, attr = m.group(1, 3) try: object = eval(expr, self.namespace) except: object = eval(expr, self.global_namespace) # Start building the attribute list via dir(), and then complete it # with a few extra special-purpose calls. words = dir(object) if hasattr(object,'__class__'): words.append('__class__') words.extend(get_class_members(object.__class__)) # this is the 'dir' function for objects with Enthought's traits if hasattr(object, 'trait_names'): words.extend(object.trait_names()) # eliminate possible duplicates, as some traits may also appear as # normal attributes in the dir() call. words = set(words) # filter out non-string attributes which may be stuffed by dir() calls # and poor coding in third-party modules words = [w for w in words if isinstance(w, basestring) and w != "__builtins__"] # Build match list to return n = len(attr) return ["%s.%s" % (expr, w) for w in words if w[:n] == attr ] class IPCompleter(Completer): """Extension of the completer class with IPython-specific features""" def __init__(self,shell,namespace=None,global_namespace=None, omit__names=0,alias_table=None): """IPCompleter() -> completer Return a completer object suitable for use by the readline library via readline.set_completer(). Inputs: - shell: a pointer to the ipython shell itself. This is needed because this completer knows about magic functions, and those can only be accessed via the ipython instance. - namespace: an optional dict where completions are performed. - global_namespace: secondary optional dict for completions, to handle cases (such as IPython embedded inside functions) where both Python scopes are visible. - The optional omit__names parameter sets the completer to omit the 'magic' names (__magicname__) for python objects unless the text to be completed explicitly starts with one or more underscores. - If alias_table is supplied, it should be a dictionary of aliases to complete. """ Completer.__init__(self,namespace,global_namespace) self.magic_prefix = shell.name+'.magic_' self.magic_escape = shell.ESC_MAGIC self.readline = readline delims = self.readline.get_completer_delims() delims = delims.replace(self.magic_escape,'') self.readline.set_completer_delims(delims) self.get_line_buffer = self.readline.get_line_buffer self.omit__names = omit__names self.merge_completions = shell.rc.readline_merge_completions if alias_table is None: alias_table = {} self.alias_table = alias_table # Regexp to split filenames with spaces in them self.space_name_re = re.compile(r'([^\\] )') # Hold a local ref. to glob.glob for speed self.glob = glob.glob # Determine if we are running on 'dumb' terminals, like (X)Emacs # buffers, to avoid completion problems. term = os.environ.get('TERM','xterm') self.dumb_terminal = term in ['dumb','emacs'] # Special handling of backslashes needed in win32 platforms if sys.platform == "win32": self.clean_glob = self._clean_glob_win32 else: self.clean_glob = self._clean_glob self.matchers = [self.python_matches, self.file_matches, self.alias_matches, self.python_func_kw_matches] # Code contributed by Alex Schmolck, for ipython/emacs integration def all_completions(self, text): """Return all possible completions for the benefit of emacs.""" completions = [] comp_append = completions.append try: for i in xrange(sys.maxint): res = self.complete(text, i) if not res: break comp_append(res) #XXX workaround for ``notDefined.`` except NameError: pass return completions # /end Alex Schmolck code. def _clean_glob(self,text): return self.glob("%s*" % text) def _clean_glob_win32(self,text): return [f.replace("\\","/") for f in self.glob("%s*" % text)] def file_matches(self, text): """Match filneames, expanding ~USER type strings. Most of the seemingly convoluted logic in this completer is an attempt to handle filenames with spaces in them. And yet it's not quite perfect, because Python's readline doesn't expose all of the GNU readline details needed for this to be done correctly. For a filename with a space in it, the printed completions will be only the parts after what's already been typed (instead of the full completions, as is normally done). I don't think with the current (as of Python 2.3) Python readline it's possible to do better.""" #print 'Completer->file_matches: <%s>' % text # dbg # chars that require escaping with backslash - i.e. chars # that readline treats incorrectly as delimiters, but we # don't want to treat as delimiters in filename matching # when escaped with backslash protectables = ' ()[]{}' def protect_filename(s): return "".join([(ch in protectables and '\\' + ch or ch) for ch in s]) lbuf = self.get_line_buffer()[:self.readline.get_endidx()] open_quotes = 0 # track strings with open quotes try: lsplit = shlex_split(lbuf)[-1] except ValueError: # typically an unmatched ", or backslash without escaped char. if lbuf.count('"')==1: open_quotes = 1 lsplit = lbuf.split('"')[-1] elif lbuf.count("'")==1: open_quotes = 1 lsplit = lbuf.split("'")[-1] else: return None except IndexError: # tab pressed on empty line lsplit = "" if lsplit != protect_filename(lsplit): # if protectables are found, do matching on the whole escaped # name has_protectables = 1 text0,text = text,lsplit else: has_protectables = 0 text = os.path.expanduser(text) if text == "": return [protect_filename(f) for f in self.glob("*")] m0 = self.clean_glob(text.replace('\\','')) if has_protectables: # If we had protectables, we need to revert our changes to the # beginning of filename so that we don't double-write the part # of the filename we have so far len_lsplit = len(lsplit) matches = [text0 + protect_filename(f[len_lsplit:]) for f in m0] else: if open_quotes: # if we have a string with an open quote, we don't need to # protect the names at all (and we _shouldn't_, as it # would cause bugs when the filesystem call is made). matches = m0 else: matches = [protect_filename(f) for f in m0] if len(matches) == 1 and os.path.isdir(matches[0]): # Takes care of links to directories also. Use '/' # explicitly, even under Windows, so that name completions # don't end up escaped. matches[0] += '/' return matches def alias_matches(self, text): """Match internal system aliases""" #print 'Completer->alias_matches:',text # dbg text = os.path.expanduser(text) aliases = self.alias_table.keys() if text == "": return aliases else: return [alias for alias in aliases if alias.startswith(text)] def python_matches(self,text): """Match attributes or global python names""" #print 'Completer->python_matches' # dbg if "." in text: try: matches = self.attr_matches(text) if text.endswith('.') and self.omit__names: if self.omit__names == 1: # true if txt is _not_ a __ name, false otherwise: no__name = (lambda txt: re.match(r'.*\.__.*?__',txt) is None) else: # true if txt is _not_ a _ name, false otherwise: no__name = (lambda txt: re.match(r'.*\._.*?',txt) is None) matches = filter(no__name, matches) except NameError: # catches . matches = [] else: matches = self.global_matches(text) # this is so completion finds magics when automagic is on: if matches == [] and not text.startswith(os.sep): matches = self.attr_matches(self.magic_prefix+text) return matches def _default_arguments(self, obj): """Return the list of default arguments of obj if it is callable, or empty list otherwise.""" if not (inspect.isfunction(obj) or inspect.ismethod(obj)): # for classes, check for __init__,__new__ if inspect.isclass(obj): obj = (getattr(obj,'__init__',None) or getattr(obj,'__new__',None)) # for all others, check if they are __call__able elif hasattr(obj, '__call__'): obj = obj.__call__ # XXX: is there a way to handle the builtins ? try: args,_,_1,defaults = inspect.getargspec(obj) if defaults: return args[-len(defaults):] except TypeError: pass return [] def python_func_kw_matches(self,text): """Match named parameters (kwargs) of the last open function""" if "." in text: # a parameter cannot be dotted return [] try: regexp = self.__funcParamsRegex except AttributeError: regexp = self.__funcParamsRegex = re.compile(r''' '.*?' | # single quoted strings or ".*?" | # double quoted strings or \w+ | # identifier \S # other characters ''', re.VERBOSE | re.DOTALL) # 1. find the nearest identifier that comes before an unclosed # parenthesis e.g. for "foo (1+bar(x), pa", the candidate is "foo" tokens = regexp.findall(self.get_line_buffer()) tokens.reverse() iterTokens = iter(tokens); openPar = 0 for token in iterTokens: if token == ')': openPar -= 1 elif token == '(': openPar += 1 if openPar > 0: # found the last unclosed parenthesis break else: return [] # 2. Concatenate dotted names ("foo.bar" for "foo.bar(x, pa" ) ids = [] isId = re.compile(r'\w+$').match while True: try: ids.append(iterTokens.next()) if not isId(ids[-1]): ids.pop(); break if not iterTokens.next() == '.': break except StopIteration: break # lookup the candidate callable matches either using global_matches # or attr_matches for dotted names if len(ids) == 1: callableMatches = self.global_matches(ids[0]) else: callableMatches = self.attr_matches('.'.join(ids[::-1])) argMatches = [] for callableMatch in callableMatches: try: namedArgs = self._default_arguments(eval(callableMatch, self.namespace)) except: continue for namedArg in namedArgs: if namedArg.startswith(text): argMatches.append("%s=" %namedArg) return argMatches 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'. """ #print '\n*** COMPLETE: <%s> (%s)' % (text,state) # dbg # if there is only a tab on a line with only whitespace, instead # of the mostly useless 'do you want to see all million # completions' message, just do the right thing and give the user # his tab! Incidentally, this enables pasting of tabbed text from # an editor (as long as autoindent is off). # don't apply this on 'dumb' terminals, such as emacs buffers, so we # don't interfere with their own tab-completion mechanism. if not (self.dumb_terminal or self.get_line_buffer().strip()): self.readline.insert_text('\t') return None magic_escape = self.magic_escape magic_prefix = self.magic_prefix try: if text.startswith(magic_escape): text = text.replace(magic_escape,magic_prefix) elif text.startswith('~'): text = os.path.expanduser(text) if state == 0: # Extend the list of completions with the results of each # matcher, so we return results to the user from all # namespaces. if self.merge_completions: self.matches = [] for matcher in self.matchers: self.matches.extend(matcher(text)) else: for matcher in self.matchers: self.matches = matcher(text) if self.matches: break try: return self.matches[state].replace(magic_prefix,magic_escape) except IndexError: return None except: #from IPython.ultraTB import AutoFormattedTB; # dbg #tb=AutoFormattedTB('Verbose');tb() #dbg # If completion fails, don't annoy the user. return None