remove another py2 only test
remove another py2 only test

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completer.py
1237 lines | 42.4 KiB | text/x-python | PythonLexer
# encoding: utf-8
"""Word completion for IPython.
This module started as 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,
"""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
#
# Some of this code originated from rlcompleter in the Python standard library
# Copyright (C) 2001 Python Software Foundation, www.python.org
from __future__ import print_function
import __main__
import glob
import inspect
import itertools
import keyword
import os
import re
import sys
import unicodedata
import string
import warnings
from importlib import import_module
from traitlets.config.configurable import Configurable
from IPython.core.error import TryNext
from IPython.core.inputsplitter import ESC_MAGIC
from IPython.core.latex_symbols import latex_symbols, reverse_latex_symbol
from IPython.utils import generics
from IPython.utils.decorators import undoc
from IPython.utils.dir2 import dir2, get_real_method
from IPython.utils.process import arg_split
from IPython.utils.py3compat import builtin_mod, string_types, PY3, cast_unicode_py2
from traitlets import Bool, Enum, observe
from functools import wraps
#-----------------------------------------------------------------------------
# Globals
#-----------------------------------------------------------------------------
# Public API
__all__ = ['Completer','IPCompleter']
if sys.platform == 'win32':
PROTECTABLES = ' '
else:
PROTECTABLES = ' ()[]{}?=\\|;:\'#*"^&'
#-----------------------------------------------------------------------------
# Work around BUG decorators.
#-----------------------------------------------------------------------------
def _strip_single_trailing_space(complete):
"""
This is a workaround for a weird IPython/Prompt_toolkit behavior,
that can be removed once we rely on a slightly more recent prompt_toolkit
version (likely > 1.0.3). So this can likely be removed in IPython 6.0
cf https://github.com/ipython/ipython/issues/9658
and https://github.com/jonathanslenders/python-prompt-toolkit/pull/328
The bug is due to the fact that in PTK the completer will reinvoke itself
after trying to completer to the longuest common prefix of all the
completions, unless only one completion is available.
This logic is faulty if the completion ends with space, which can happen in
case like::
from foo import im<ta>
which only matching completion is `import `. Note the leading space at the
end. So leaving a space at the end is a reasonable request, but for now
we'll strip it.
"""
@wraps(complete)
def comp(*args, **kwargs):
text, matches = complete(*args, **kwargs)
if len(matches) == 1:
return text, [matches[0].rstrip()]
return text, matches
return comp
#-----------------------------------------------------------------------------
# Main functions and classes
#-----------------------------------------------------------------------------
def has_open_quotes(s):
"""Return whether a string has open quotes.
This simply counts whether the number of quote characters of either type in
the string is odd.
Returns
-------
If there is an open quote, the quote character is returned. Else, return
False.
"""
# We check " first, then ', so complex cases with nested quotes will get
# the " to take precedence.
if s.count('"') % 2:
return '"'
elif s.count("'") % 2:
return "'"
else:
return False
def protect_filename(s):
"""Escape a string to protect certain characters."""
if set(s) & set(PROTECTABLES):
if sys.platform == "win32":
return '"' + s + '"'
else:
return "".join(("\\" + c if c in PROTECTABLES else c) for c in s)
else:
return s
def expand_user(path):
"""Expand '~'-style usernames in strings.
This is similar to :func:`os.path.expanduser`, but it computes and returns
extra information that will be useful if the input was being used in
computing completions, and you wish to return the completions with the
original '~' instead of its expanded value.
Parameters
----------
path : str
String to be expanded. If no ~ is present, the output is the same as the
input.
Returns
-------
newpath : str
Result of ~ expansion in the input path.
tilde_expand : bool
Whether any expansion was performed or not.
tilde_val : str
The value that ~ was replaced with.
"""
# Default values
tilde_expand = False
tilde_val = ''
newpath = path
if path.startswith('~'):
tilde_expand = True
rest = len(path)-1
newpath = os.path.expanduser(path)
if rest:
tilde_val = newpath[:-rest]
else:
tilde_val = newpath
return newpath, tilde_expand, tilde_val
def compress_user(path, tilde_expand, tilde_val):
"""Does the opposite of expand_user, with its outputs.
"""
if tilde_expand:
return path.replace(tilde_val, '~')
else:
return path
def completions_sorting_key(word):
"""key for sorting completions
This does several things:
- Lowercase all completions, so they are sorted alphabetically with
upper and lower case words mingled
- Demote any completions starting with underscores to the end
- Insert any %magic and %%cellmagic completions in the alphabetical order
by their name
"""
# Case insensitive sort
word = word.lower()
prio1, prio2 = 0, 0
if word.startswith('__'):
prio1 = 2
elif word.startswith('_'):
prio1 = 1
if word.endswith('='):
prio1 = -1
if word.startswith('%%'):
# If there's another % in there, this is something else, so leave it alone
if not "%" in word[2:]:
word = word[2:]
prio2 = 2
elif word.startswith('%'):
if not "%" in word[1:]:
word = word[1:]
prio2 = 1
return prio1, word, prio2
@undoc
class Bunch(object): pass
if sys.platform == 'win32':
DELIMS = ' \t\n`!@#$^&*()=+[{]}|;\'",<>?'
else:
DELIMS = ' \t\n`!@#$^&*()=+[{]}\\|;:\'",<>?'
GREEDY_DELIMS = ' =\r\n'
class CompletionSplitter(object):
"""An object to split an input line in a manner similar to readline.
By having our own implementation, we can expose readline-like completion in
a uniform manner to all frontends. This object only needs to be given the
line of text to be split and the cursor position on said line, and it
returns the 'word' to be completed on at the cursor after splitting the
entire line.
What characters are used as splitting delimiters can be controlled by
setting the `delims` attribute (this is a property that internally
automatically builds the necessary regular expression)"""
# Private interface
# A string of delimiter characters. The default value makes sense for
# IPython's most typical usage patterns.
_delims = DELIMS
# The expression (a normal string) to be compiled into a regular expression
# for actual splitting. We store it as an attribute mostly for ease of
# debugging, since this type of code can be so tricky to debug.
_delim_expr = None
# The regular expression that does the actual splitting
_delim_re = None
def __init__(self, delims=None):
delims = CompletionSplitter._delims if delims is None else delims
self.delims = delims
@property
def delims(self):
"""Return the string of delimiter characters."""
return self._delims
@delims.setter
def delims(self, delims):
"""Set the delimiters for line splitting."""
expr = '[' + ''.join('\\'+ c for c in delims) + ']'
self._delim_re = re.compile(expr)
self._delims = delims
self._delim_expr = expr
def split_line(self, line, cursor_pos=None):
"""Split a line of text with a cursor at the given position.
"""
l = line if cursor_pos is None else line[:cursor_pos]
return self._delim_re.split(l)[-1]
class Completer(Configurable):
greedy = Bool(False,
help="""Activate greedy completion
PENDING DEPRECTION. this is now mostly taken care of with Jedi.
This will enable completion on elements of lists, results of function calls, etc.,
but can be unsafe because the code is actually evaluated on TAB.
"""
).tag(config=True)
def __init__(self, namespace=None, global_namespace=None, **kwargs):
"""Create a new completer for the command line.
Completer(namespace=ns, global_namespace=ns2) -> 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)
"""
# 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
super(Completer, self).__init__(**kwargs)
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_mod.__dict__.keys(),
self.namespace.keys(),
self.global_namespace.keys()]:
for word in lst:
if word[:n] == text and word != "__builtins__":
match_append(word)
return [cast_unicode_py2(m) for m in 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.
"""
# Another option, seems to work great. Catches things like ''.<tab>
m = re.match(r"(\S+(\.\w+)*)\.(\w*)$", text)
if m:
expr, attr = m.group(1, 3)
elif self.greedy:
m2 = re.match(r"(.+)\.(\w*)$", self.line_buffer)
if not m2:
return []
expr, attr = m2.group(1,2)
else:
return []
try:
obj = eval(expr, self.namespace)
except:
try:
obj = eval(expr, self.global_namespace)
except:
return []
if self.limit_to__all__ and hasattr(obj, '__all__'):
words = get__all__entries(obj)
else:
words = dir2(obj)
try:
words = generics.complete_object(obj, words)
except TryNext:
pass
except Exception:
# Silence errors from completion function
#raise # dbg
pass
# Build match list to return
n = len(attr)
return [u"%s.%s" % (expr, w) for w in words if w[:n] == attr ]
def get__all__entries(obj):
"""returns the strings in the __all__ attribute"""
try:
words = getattr(obj, '__all__')
except:
return []
return [cast_unicode_py2(w) for w in words if isinstance(w, string_types)]
def match_dict_keys(keys, prefix, delims):
"""Used by dict_key_matches, matching the prefix to a list of keys"""
if not prefix:
return None, 0, [repr(k) for k in keys
if isinstance(k, (string_types, bytes))]
quote_match = re.search('["\']', prefix)
quote = quote_match.group()
try:
prefix_str = eval(prefix + quote, {})
except Exception:
return None, 0, []
pattern = '[^' + ''.join('\\' + c for c in delims) + ']*$'
token_match = re.search(pattern, prefix, re.UNICODE)
token_start = token_match.start()
token_prefix = token_match.group()
# TODO: support bytes in Py3k
matched = []
for key in keys:
try:
if not key.startswith(prefix_str):
continue
except (AttributeError, TypeError, UnicodeError):
# Python 3+ TypeError on b'a'.startswith('a') or vice-versa
continue
# reformat remainder of key to begin with prefix
rem = key[len(prefix_str):]
# force repr wrapped in '
rem_repr = repr(rem + '"')
if rem_repr.startswith('u') and prefix[0] not in 'uU':
# Found key is unicode, but prefix is Py2 string.
# Therefore attempt to interpret key as string.
try:
rem_repr = repr(rem.encode('ascii') + '"')
except UnicodeEncodeError:
continue
rem_repr = rem_repr[1 + rem_repr.index("'"):-2]
if quote == '"':
# The entered prefix is quoted with ",
# but the match is quoted with '.
# A contained " hence needs escaping for comparison:
rem_repr = rem_repr.replace('"', '\\"')
# then reinsert prefix from start of token
matched.append('%s%s' % (token_prefix, rem_repr))
return quote, token_start, matched
def _safe_isinstance(obj, module, class_name):
"""Checks if obj is an instance of module.class_name if loaded
"""
return (module in sys.modules and
isinstance(obj, getattr(import_module(module), class_name)))
def back_unicode_name_matches(text):
u"""Match unicode characters back to unicode name
This does ☃ -> \\snowman
Note that snowman is not a valid python3 combining character but will be expanded.
Though it will not recombine back to the snowman character by the completion machinery.
This will not either back-complete standard sequences like \\n, \\b ...
Used on Python 3 only.
"""
if len(text)<2:
return u'', ()
maybe_slash = text[-2]
if maybe_slash != '\\':
return u'', ()
char = text[-1]
# no expand on quote for completion in strings.
# nor backcomplete standard ascii keys
if char in string.ascii_letters or char in ['"',"'"]:
return u'', ()
try :
unic = unicodedata.name(char)
return '\\'+char,['\\'+unic]
except KeyError:
pass
return u'', ()
def back_latex_name_matches(text):
u"""Match latex characters back to unicode name
This does ->\\sqrt
Used on Python 3 only.
"""
if len(text)<2:
return u'', ()
maybe_slash = text[-2]
if maybe_slash != '\\':
return u'', ()
char = text[-1]
# no expand on quote for completion in strings.
# nor backcomplete standard ascii keys
if char in string.ascii_letters or char in ['"',"'"]:
return u'', ()
try :
latex = reverse_latex_symbol[char]
# '\\' replace the \ as well
return '\\'+char,[latex]
except KeyError:
pass
return u'', ()
class IPCompleter(Completer):
"""Extension of the completer class with IPython-specific features"""
@observe('greedy')
def _greedy_changed(self, change):
"""update the splitter and readline delims when greedy is changed"""
if change['new']:
self.splitter.delims = GREEDY_DELIMS
else:
self.splitter.delims = DELIMS
merge_completions = Bool(True,
help="""Whether to merge completion results into a single list
If False, only the completion results from the first non-empty
completer will be returned.
"""
).tag(config=True)
omit__names = Enum((0,1,2), default_value=2,
help="""Instruct the completer to omit private method names
Specifically, when completing on ``object.<tab>``.
When 2 [default]: all names that start with '_' will be excluded.
When 1: all 'magic' names (``__foo__``) will be excluded.
When 0: nothing will be excluded.
"""
).tag(config=True)
limit_to__all__ = Bool(False,
help="""
DEPRECATED as of version 5.0.
Instruct the completer to use __all__ for the completion
Specifically, when completing on ``object.<tab>``.
When True: only those names in obj.__all__ will be included.
When False [default]: the __all__ attribute is ignored
""",
).tag(config=True)
def __init__(self, shell=None, namespace=None, global_namespace=None,
use_readline=False, config=None, **kwargs):
"""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.
use_readline : bool, optional
DEPRECATED, ignored.
"""
self.magic_escape = ESC_MAGIC
self.splitter = CompletionSplitter()
if use_readline:
warnings.warn('The use_readline parameter is deprecated and ignored since IPython 6.0.',
DeprecationWarning, stacklevel=2)
# _greedy_changed() depends on splitter and readline being defined:
Completer.__init__(self, namespace=namespace, global_namespace=global_namespace,
config=config, **kwargs)
# List where completion matches will be stored
self.matches = []
self.shell = shell
# 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
#regexp to parse docstring for function signature
self.docstring_sig_re = re.compile(r'^[\w|\s.]+\(([^)]*)\).*')
self.docstring_kwd_re = re.compile(r'[\s|\[]*(\w+)(?:\s*=\s*.*)')
#use this if positional argument name is also needed
#= re.compile(r'[\s|\[]*(\w+)(?:\s*=?\s*.*)')
# All active matcher routines for completion
self.matchers = [
self.python_matches,
self.file_matches,
self.magic_matches,
self.python_func_kw_matches,
self.dict_key_matches,
]
# This is set externally by InteractiveShell
self.custom_completers = None
def all_completions(self, text):
"""
Wrapper around the complete method for the benefit of emacs.
"""
return self.complete(text)[1]
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 filenames, 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."""
# 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
if text.startswith('!'):
text = text[1:]
text_prefix = u'!'
else:
text_prefix = u''
text_until_cursor = self.text_until_cursor
# track strings with open quotes
open_quotes = has_open_quotes(text_until_cursor)
if '(' in text_until_cursor or '[' in text_until_cursor:
lsplit = text
else:
try:
# arg_split ~ shlex.split, but with unicode bugs fixed by us
lsplit = arg_split(text_until_cursor)[-1]
except ValueError:
# typically an unmatched ", or backslash without escaped char.
if open_quotes:
lsplit = text_until_cursor.split(open_quotes)[-1]
else:
return []
except IndexError:
# tab pressed on empty line
lsplit = ""
if not open_quotes and lsplit != protect_filename(lsplit):
# if protectables are found, do matching on the whole escaped name
has_protectables = True
text0,text = text,lsplit
else:
has_protectables = False
text = os.path.expanduser(text)
if text == "":
return [text_prefix + cast_unicode_py2(protect_filename(f)) for f in self.glob("*")]
# Compute the matches from the filesystem
if sys.platform == 'win32':
m0 = self.clean_glob(text)
else:
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 = [text_prefix + 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 = [text_prefix +
protect_filename(f) for f in m0]
# Mark directories in input list by appending '/' to their names.
return [cast_unicode_py2(x+'/') if os.path.isdir(x) else x for x in matches]
def magic_matches(self, text):
"""Match magics"""
# Get all shell magics now rather than statically, so magics loaded at
# runtime show up too.
lsm = self.shell.magics_manager.lsmagic()
line_magics = lsm['line']
cell_magics = lsm['cell']
pre = self.magic_escape
pre2 = pre+pre
# Completion logic:
# - user gives %%: only do cell magics
# - user gives %: do both line and cell magics
# - no prefix: do both
# In other words, line magics are skipped if the user gives %% explicitly
bare_text = text.lstrip(pre)
comp = [ pre2+m for m in cell_magics if m.startswith(bare_text)]
if not text.startswith(pre2):
comp += [ pre+m for m in line_magics if m.startswith(bare_text)]
return [cast_unicode_py2(c) for c in comp]
def python_matches(self, text):
"""Match attributes or global python names"""
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[txt.rindex('.'):]) is None)
matches = filter(no__name, matches)
except NameError:
# catches <undefined attributes>.<tab>
matches = []
else:
matches = self.global_matches(text)
return matches
def _default_arguments_from_docstring(self, doc):
"""Parse the first line of docstring for call signature.
Docstring should be of the form 'min(iterable[, key=func])\n'.
It can also parse cython docstring of the form
'Minuit.migrad(self, int ncall=10000, resume=True, int nsplit=1)'.
"""
if doc is None:
return []
#care only the firstline
line = doc.lstrip().splitlines()[0]
#p = re.compile(r'^[\w|\s.]+\(([^)]*)\).*')
#'min(iterable[, key=func])\n' -> 'iterable[, key=func]'
sig = self.docstring_sig_re.search(line)
if sig is None:
return []
# iterable[, key=func]' -> ['iterable[' ,' key=func]']
sig = sig.groups()[0].split(',')
ret = []
for s in sig:
#re.compile(r'[\s|\[]*(\w+)(?:\s*=\s*.*)')
ret += self.docstring_kwd_re.findall(s)
return ret
def _default_arguments(self, obj):
"""Return the list of default arguments of obj if it is callable,
or empty list otherwise."""
call_obj = obj
ret = []
if inspect.isbuiltin(obj):
pass
elif not (inspect.isfunction(obj) or inspect.ismethod(obj)):
if inspect.isclass(obj):
#for cython embededsignature=True the constructor docstring
#belongs to the object itself not __init__
ret += self._default_arguments_from_docstring(
getattr(obj, '__doc__', ''))
# for classes, check for __init__,__new__
call_obj = (getattr(obj, '__init__', None) or
getattr(obj, '__new__', None))
# for all others, check if they are __call__able
elif hasattr(obj, '__call__'):
call_obj = obj.__call__
ret += self._default_arguments_from_docstring(
getattr(call_obj, '__doc__', ''))
if PY3:
_keeps = (inspect.Parameter.KEYWORD_ONLY,
inspect.Parameter.POSITIONAL_OR_KEYWORD)
signature = inspect.signature
else:
import IPython.utils.signatures
_keeps = (IPython.utils.signatures.Parameter.KEYWORD_ONLY,
IPython.utils.signatures.Parameter.POSITIONAL_OR_KEYWORD)
signature = IPython.utils.signatures.signature
try:
sig = signature(call_obj)
ret.extend(k for k, v in sig.parameters.items() if
v.kind in _keeps)
except ValueError:
pass
return list(set(ret))
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 before the cursor
# e.g. for "foo (1+bar(x), pa<cursor>,a=1)", the candidate is "foo"
tokens = regexp.findall(self.text_until_cursor)
iterTokens = reversed(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(next(iterTokens))
if not isId(ids[-1]):
ids.pop(); break
if not next(iterTokens) == '.':
break
except StopIteration:
break
# Find all named arguments already assigned to, as to avoid suggesting
# them again
usedNamedArgs = set()
par_level = -1
for token, next_token in zip(tokens, tokens[1:]):
if token == '(':
par_level += 1
elif token == ')':
par_level -= 1
if par_level != 0:
continue
if next_token != '=':
continue
usedNamedArgs.add(token)
# 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
# Remove used named arguments from the list, no need to show twice
for namedArg in set(namedArgs) - usedNamedArgs:
if namedArg.startswith(text):
argMatches.append(u"%s=" %namedArg)
return argMatches
def dict_key_matches(self, text):
"Match string keys in a dictionary, after e.g. 'foo[' "
def get_keys(obj):
# Objects can define their own completions by defining an
# _ipy_key_completions_() method.
method = get_real_method(obj, '_ipython_key_completions_')
if method is not None:
return method()
# Special case some common in-memory dict-like types
if isinstance(obj, dict) or\
_safe_isinstance(obj, 'pandas', 'DataFrame'):
try:
return list(obj.keys())
except Exception:
return []
elif _safe_isinstance(obj, 'numpy', 'ndarray') or\
_safe_isinstance(obj, 'numpy', 'void'):
return obj.dtype.names or []
return []
try:
regexps = self.__dict_key_regexps
except AttributeError:
dict_key_re_fmt = r'''(?x)
( # match dict-referring expression wrt greedy setting
%s
)
\[ # open bracket
\s* # and optional whitespace
([uUbB]? # string prefix (r not handled)
(?: # unclosed string
'(?:[^']|(?<!\\)\\')*
|
"(?:[^"]|(?<!\\)\\")*
)
)?
$
'''
regexps = self.__dict_key_regexps = {
False: re.compile(dict_key_re_fmt % '''
# identifiers separated by .
(?!\d)\w+
(?:\.(?!\d)\w+)*
'''),
True: re.compile(dict_key_re_fmt % '''
.+
''')
}
match = regexps[self.greedy].search(self.text_until_cursor)
if match is None:
return []
expr, prefix = match.groups()
try:
obj = eval(expr, self.namespace)
except Exception:
try:
obj = eval(expr, self.global_namespace)
except Exception:
return []
keys = get_keys(obj)
if not keys:
return keys
closing_quote, token_offset, matches = match_dict_keys(keys, prefix, self.splitter.delims)
if not matches:
return matches
# get the cursor position of
# - the text being completed
# - the start of the key text
# - the start of the completion
text_start = len(self.text_until_cursor) - len(text)
if prefix:
key_start = match.start(2)
completion_start = key_start + token_offset
else:
key_start = completion_start = match.end()
# grab the leading prefix, to make sure all completions start with `text`
if text_start > key_start:
leading = ''
else:
leading = text[text_start:completion_start]
# the index of the `[` character
bracket_idx = match.end(1)
# append closing quote and bracket as appropriate
# this is *not* appropriate if the opening quote or bracket is outside
# the text given to this method
suf = ''
continuation = self.line_buffer[len(self.text_until_cursor):]
if key_start > text_start and closing_quote:
# quotes were opened inside text, maybe close them
if continuation.startswith(closing_quote):
continuation = continuation[len(closing_quote):]
else:
suf += closing_quote
if bracket_idx > text_start:
# brackets were opened inside text, maybe close them
if not continuation.startswith(']'):
suf += ']'
return [leading + k + suf for k in matches]
def unicode_name_matches(self, text):
u"""Match Latex-like syntax for unicode characters base
on the name of the character.
This does \\GREEK SMALL LETTER ETA -> η
Works only on valid python 3 identifier, or on combining characters that
will combine to form a valid identifier.
Used on Python 3 only.
"""
slashpos = text.rfind('\\')
if slashpos > -1:
s = text[slashpos+1:]
try :
unic = unicodedata.lookup(s)
# allow combining chars
if ('a'+unic).isidentifier():
return '\\'+s,[unic]
except KeyError:
pass
return u'', []
def latex_matches(self, text):
u"""Match Latex syntax for unicode characters.
This does both \\alp -> \\alpha and \\alpha -> α
Used on Python 3 only.
"""
slashpos = text.rfind('\\')
if slashpos > -1:
s = text[slashpos:]
if s in latex_symbols:
# Try to complete a full latex symbol to unicode
# \\alpha -> α
return s, [latex_symbols[s]]
else:
# If a user has partially typed a latex symbol, give them
# a full list of options \al -> [\aleph, \alpha]
matches = [k for k in latex_symbols if k.startswith(s)]
return s, matches
return u'', []
def dispatch_custom_completer(self, text):
if not self.custom_completers:
return
line = self.line_buffer
if not line.strip():
return None
# Create a little structure to pass all the relevant information about
# the current completion to any custom completer.
event = Bunch()
event.line = line
event.symbol = text
cmd = line.split(None,1)[0]
event.command = cmd
event.text_until_cursor = self.text_until_cursor
# for foo etc, try also to find completer for %foo
if not cmd.startswith(self.magic_escape):
try_magic = self.custom_completers.s_matches(
self.magic_escape + cmd)
else:
try_magic = []
for c in itertools.chain(self.custom_completers.s_matches(cmd),
try_magic,
self.custom_completers.flat_matches(self.text_until_cursor)):
try:
res = c(event)
if res:
# first, try case sensitive match
withcase = [cast_unicode_py2(r) for r in res if r.startswith(text)]
if withcase:
return withcase
# if none, then case insensitive ones are ok too
text_low = text.lower()
return [cast_unicode_py2(r) for r in res if r.lower().startswith(text_low)]
except TryNext:
pass
return None
@_strip_single_trailing_space
def complete(self, text=None, line_buffer=None, cursor_pos=None):
"""Find completions for the given text and line context.
Note that both the text and the line_buffer are optional, but at least
one of them must be given.
Parameters
----------
text : string, optional
Text to perform the completion on. If not given, the line buffer
is split using the instance's CompletionSplitter object.
line_buffer : string, optional
If not given, the completer attempts to obtain the current line
buffer via readline. This keyword allows clients which are
requesting for text completions in non-readline contexts to inform
the completer of the entire text.
cursor_pos : int, optional
Index of the cursor in the full line buffer. Should be provided by
remote frontends where kernel has no access to frontend state.
Returns
-------
text : str
Text that was actually used in the completion.
matches : list
A list of completion matches.
"""
# if the cursor position isn't given, the only sane assumption we can
# make is that it's at the end of the line (the common case)
if cursor_pos is None:
cursor_pos = len(line_buffer) if text is None else len(text)
if self.use_main_ns:
self.namespace = __main__.__dict__
if PY3:
base_text = text if not line_buffer else line_buffer[:cursor_pos]
latex_text, latex_matches = self.latex_matches(base_text)
if latex_matches:
return latex_text, latex_matches
name_text = ''
name_matches = []
for meth in (self.unicode_name_matches, back_latex_name_matches, back_unicode_name_matches):
name_text, name_matches = meth(base_text)
if name_text:
return name_text, name_matches
# if text is either None or an empty string, rely on the line buffer
if not text:
text = self.splitter.split_line(line_buffer, cursor_pos)
# If no line buffer is given, assume the input text is all there was
if line_buffer is None:
line_buffer = text
self.line_buffer = line_buffer
self.text_until_cursor = self.line_buffer[:cursor_pos]
# Start with a clean slate of completions
self.matches[:] = []
custom_res = self.dispatch_custom_completer(text)
if custom_res is not None:
# did custom completers produce something?
self.matches = custom_res
else:
# 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:
try:
self.matches.extend(matcher(text))
except:
# Show the ugly traceback if the matcher causes an
# exception, but do NOT crash the kernel!
sys.excepthook(*sys.exc_info())
else:
for matcher in self.matchers:
self.matches = matcher(text)
if self.matches:
break
# FIXME: we should extend our api to return a dict with completions for
# different types of objects. The rlcomplete() method could then
# simply collapse the dict into a list for readline, but we'd have
# richer completion semantics in other evironments.
self.matches = sorted(set(self.matches), key=completions_sorting_key)
return text, self.matches