##// END OF EJS Templates
Merge pull request #13213 from Kojoley/fix-bunch-of-doctests...
Merge pull request #13213 from Kojoley/fix-bunch-of-doctests Fix bunch of doctests

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"""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,
This module now support a wide variety of completion mechanism both available
for normal classic Python code, as well as completer for IPython specific
Syntax like magics.
Latex and Unicode completion
IPython and compatible frontends not only can complete your code, but can help
you to input a wide range of characters. In particular we allow you to insert
a unicode character using the tab completion mechanism.
Forward latex/unicode completion
Forward completion allows you to easily type a unicode character using its latex
name, or unicode long description. To do so type a backslash follow by the
relevant name and press tab:
Using latex completion:
.. code::
or using unicode completion:
.. code::
Only valid Python identifiers will complete. Combining characters (like arrow or
dots) are also available, unlike latex they need to be put after the their
counterpart that is to say, `F\\\\vec<tab>` is correct, not `\\\\vec<tab>F`.
Some browsers are known to display combining characters incorrectly.
Backward latex completion
It is sometime challenging to know how to type a character, if you are using
IPython, or any compatible frontend you can prepend backslash to the character
and press `<tab>` to expand it to its latex form.
.. code::
Both forward and backward completions can be deactivated by setting the
``Completer.backslash_combining_completions`` option to ``False``.
Starting with IPython 6.0, this module can make use of the Jedi library to
generate completions both using static analysis of the code, and dynamically
inspecting multiple namespaces. Jedi is an autocompletion and static analysis
for Python. The APIs attached to this new mechanism is unstable and will
raise unless use in an :any:`provisionalcompleter` context manager.
You will find that the following are experimental:
- :any:`provisionalcompleter`
- :any:`IPCompleter.completions`
- :any:`Completion`
- :any:`rectify_completions`
.. note::
better name for :any:`rectify_completions` ?
We welcome any feedback on these new API, and we also encourage you to try this
module in debug mode (start IPython with ``--Completer.debug=True``) in order
to have extra logging information if :any:`jedi` is crashing, or if current
IPython completer pending deprecations are returning results not yet handled
by :any:`jedi`
Using Jedi for tab completion allow snippets like the following to work without
having to execute any code:
>>> myvar = ['hello', 42]
... myvar[1].bi<tab>
Tab completion will be able to infer that ``myvar[1]`` is a real number without
executing any code unlike the previously available ``IPCompleter.greedy``
Be sure to update :any:`jedi` to the latest stable version or to try the
current development version to get better completions.
# 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
import builtins as builtin_mod
import glob
import inspect
import itertools
import keyword
import os
import re
import string
import sys
import time
import unicodedata
import uuid
import warnings
from contextlib import contextmanager
from importlib import import_module
from types import SimpleNamespace
from typing import Iterable, Iterator, List, Tuple, Union, Any, Sequence, Dict, NamedTuple, Pattern, Optional
from IPython.core.error import TryNext
from IPython.core.inputtransformer2 import ESC_MAGIC
from IPython.core.latex_symbols import latex_symbols, reverse_latex_symbol
from IPython.core.oinspect import InspectColors
from IPython.utils import generics
from IPython.utils.dir2 import dir2, get_real_method
from IPython.utils.path import ensure_dir_exists
from IPython.utils.process import arg_split
from traitlets import Bool, Enum, Int, List as ListTrait, Unicode, default, observe
from traitlets.config.configurable import Configurable
import __main__
# skip module docstests
__skip_doctest__ = True
import jedi
jedi.settings.case_insensitive_completion = False
import jedi.api.helpers
import jedi.api.classes
except ImportError:
# Globals
# ranges where we have most of the valid unicode names. We could be more finer
# grained but is it worth it for performance While unicode have character in the
# range 0, 0x110000, we seem to have name for about 10% of those. (131808 as I
# write this). With below range we cover them all, with a density of ~67%
# biggest next gap we consider only adds up about 1% density and there are 600
# gaps that would need hard coding.
_UNICODE_RANGES = [(32, 0x3134b), (0xe0001, 0xe01f0)]
# Public API
__all__ = ['Completer','IPCompleter']
if sys.platform == 'win32':
PROTECTABLES = ' ()[]{}?=\\|;:\'#*"^&'
# Protect against returning an enormous number of completions which the frontend
# may have trouble processing.
_deprecation_readline_sentinel = object()
class ProvisionalCompleterWarning(FutureWarning):
Exception raise by an experimental feature in this module.
Wrap code in :any:`provisionalcompleter` context manager if you
are certain you want to use an unstable feature.
warnings.filterwarnings('error', category=ProvisionalCompleterWarning)
def provisionalcompleter(action='ignore'):
This context manager has to be used in any place where unstable completer
behavior and API may be called.
>>> with provisionalcompleter():
... completer.do_experimental_things() # works
>>> completer.do_experimental_things() # raises.
.. note::
By using this context manager you agree that the API in use may change
without warning, and that you won't complain if they do so.
You also understand that, if the API is not to your liking, you should report
a bug to explain your use case upstream.
We'll be happy to get your feedback, feature requests, and improvements on
any of the unstable APIs!
with warnings.catch_warnings():
warnings.filterwarnings(action, category=ProvisionalCompleterWarning)
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.
If there is an open quote, the quote character is returned. Else, return
# 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 "'"
return False
def protect_filename(s, protectables=PROTECTABLES):
"""Escape a string to protect certain characters."""
if set(s) & set(protectables):
if sys.platform == "win32":
return '"' + s + '"'
return "".join(("\\" + c if c in protectables else c) for c in s)
return s
def expand_user(path:str) -> Tuple[str, bool, str]:
"""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.
path : str
String to be expanded. If no ~ is present, the output is the same as the
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]
tilde_val = newpath
return newpath, tilde_expand, tilde_val
def compress_user(path:str, tilde_expand:bool, tilde_val:str) -> str:
"""Does the opposite of expand_user, with its outputs.
if tilde_expand:
return path.replace(tilde_val, '~')
return path
def completions_sorting_key(word):
"""key for sorting completions
This does several things:
- Demote any completions starting with underscores to the end
- Insert any %magic and %%cellmagic completions in the alphabetical order
by their name
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
class _FakeJediCompletion:
This is a workaround to communicate to the UI that Jedi has crashed and to
report a bug. Will be used only id :any:`IPCompleter.debug` is set to true.
Added in IPython 6.0 so should likely be removed for 7.0
def __init__(self, name):
self.name = name
self.complete = name
self.type = 'crashed'
self.name_with_symbols = name
self.signature = ''
self._origin = 'fake'
def __repr__(self):
return '<Fake completion object jedi has crashed>'
class Completion:
Completion object used and return by IPython completers.
.. warning::
This function is unstable, API may change without warning.
It will also raise unless use in proper context manager.
This act as a middle ground :any:`Completion` object between the
:any:`jedi.api.classes.Completion` object and the Prompt Toolkit completion
object. While Jedi need a lot of information about evaluator and how the
code should be ran/inspected, PromptToolkit (and other frontend) mostly
need user facing information.
- Which range should be replaced replaced by what.
- Some metadata (like completion type), or meta information to displayed to
the use user.
For debugging purpose we can also store the origin of the completion (``jedi``,
``IPython.python_matches``, ``IPython.magics_matches``...).
__slots__ = ['start', 'end', 'text', 'type', 'signature', '_origin']
def __init__(self, start: int, end: int, text: str, *, type: str=None, _origin='', signature='') -> None:
warnings.warn("``Completion`` is a provisional API (as of IPython 6.0). "
"It may change without warnings. "
"Use in corresponding context manager.",
category=ProvisionalCompleterWarning, stacklevel=2)
self.start = start
self.end = end
self.text = text
self.type = type
self.signature = signature
self._origin = _origin
def __repr__(self):
return '<Completion start=%s end=%s text=%r type=%r, signature=%r,>' % \
(self.start, self.end, self.text, self.type or '?', self.signature or '?')
def __eq__(self, other)->Bool:
Equality and hash do not hash the type (as some completer may not be
able to infer the type), but are use to (partially) de-duplicate
Completely de-duplicating completion is a bit tricker that just
comparing as it depends on surrounding text, which Completions are not
aware of.
return self.start == other.start and \
self.end == other.end and \
self.text == other.text
def __hash__(self):
return hash((self.start, self.end, self.text))
_IC = Iterable[Completion]
def _deduplicate_completions(text: str, completions: _IC)-> _IC:
Deduplicate a set of completions.
.. warning::
This function is unstable, API may change without warning.
text : str
text that should be completed.
completions : Iterator[Completion]
iterator over the completions to deduplicate
`Completions` objects
Completions coming from multiple sources, may be different but end up having
the same effect when applied to ``text``. If this is the case, this will
consider completions as equal and only emit the first encountered.
Not folded in `completions()` yet for debugging purpose, and to detect when
the IPython completer does return things that Jedi does not, but should be
at some point.
completions = list(completions)
if not completions:
new_start = min(c.start for c in completions)
new_end = max(c.end for c in completions)
seen = set()
for c in completions:
new_text = text[new_start:c.start] + c.text + text[c.end:new_end]
if new_text not in seen:
yield c
def rectify_completions(text: str, completions: _IC, *, _debug=False)->_IC:
Rectify a set of completions to all have the same ``start`` and ``end``
.. warning::
This function is unstable, API may change without warning.
It will also raise unless use in proper context manager.
text : str
text that should be completed.
completions : Iterator[Completion]
iterator over the completions to rectify
:any:`jedi.api.classes.Completion` s returned by Jedi may not have the same start and end, though
the Jupyter Protocol requires them to behave like so. This will readjust
the completion to have the same ``start`` and ``end`` by padding both
extremities with surrounding text.
During stabilisation should support a ``_debug`` option to log which
completion are return by the IPython completer and not found in Jedi in
order to make upstream bug report.
warnings.warn("`rectify_completions` is a provisional API (as of IPython 6.0). "
"It may change without warnings. "
"Use in corresponding context manager.",
category=ProvisionalCompleterWarning, stacklevel=2)
completions = list(completions)
if not completions:
starts = (c.start for c in completions)
ends = (c.end for c in completions)
new_start = min(starts)
new_end = max(ends)
seen_jedi = set()
seen_python_matches = set()
for c in completions:
new_text = text[new_start:c.start] + c.text + text[c.end:new_end]
if c._origin == 'jedi':
elif c._origin == 'IPCompleter.python_matches':
yield Completion(new_start, new_end, new_text, type=c.type, _origin=c._origin, signature=c.signature)
diff = seen_python_matches.difference(seen_jedi)
if diff and _debug:
print('IPython.python matches have extras:', diff)
if sys.platform == 'win32':
DELIMS = ' \t\n`!@#$^&*()=+[{]}|;\'",<>?'
DELIMS = ' \t\n`!@#$^&*()=+[{]}\\|;:\'",<>?'
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
def delims(self):
"""Return the string of delimiter characters."""
return self._delims
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.
use_jedi = Bool(default_value=JEDI_INSTALLED,
help="Experimental: Use Jedi to generate autocompletions. "
"Default to True if jedi is installed.").tag(config=True)
jedi_compute_type_timeout = Int(default_value=400,
help="""Experimental: restrict time (in milliseconds) during which Jedi can compute types.
Set to 0 to stop computing types. Non-zero value lower than 100ms may hurt
performance by preventing jedi to build its cache.
debug = Bool(default_value=False,
help='Enable debug for the Completer. Mostly print extra '
'information for experimental jedi integration.')\
backslash_combining_completions = Bool(True,
help="Enable unicode completions, e.g. \\alpha<tab> . "
"Includes completion of latex commands, unicode names, and expanding "
"unicode characters back to latex commands.").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
# 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 = True
self.use_main_ns = False
self.namespace = namespace
# The global namespace, if given, can be bound directly
if global_namespace is None:
self.global_namespace = {}
self.global_namespace = global_namespace
self.custom_matchers = []
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)
self.matches = self.global_matches(text)
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,
for word in lst:
if word[:n] == text and word != "__builtins__":
snake_case_re = re.compile(r"[^_]+(_[^_]+)+?\Z")
for lst in [self.namespace.keys(),
shortened = {"_".join([sub[0] for sub in word.split('_')]) : word
for word in lst if snake_case_re.match(word)}
for word in shortened.keys():
if word[:n] == text and word != "__builtins__":
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
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)
return []
obj = eval(expr, self.namespace)
obj = eval(expr, self.global_namespace)
return []
if self.limit_to__all__ and hasattr(obj, '__all__'):
words = get__all__entries(obj)
words = dir2(obj)
words = generics.complete_object(obj, words)
except TryNext:
except AssertionError:
except Exception:
# Silence errors from completion function
#raise # dbg
# 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"""
words = getattr(obj, '__all__')
return []
return [w for w in words if isinstance(w, str)]
def match_dict_keys(keys: List[Union[str, bytes, Tuple[Union[str, bytes]]]], prefix: str, delims: str,
extra_prefix: Optional[Tuple[str, bytes]]=None) -> Tuple[str, int, List[str]]:
"""Used by dict_key_matches, matching the prefix to a list of keys
list of keys in dictionary currently being completed.
Part of the text already typed by the user. E.g. `mydict[b'fo`
String of delimiters to consider when finding the current key.
extra_prefix : optional
Part of the text already typed in multi-key index cases. E.g. for
`mydict['foo', "bar", 'b`, this would be `('foo', 'bar')`.
A tuple of three elements: ``quote``, ``token_start``, ``matched``, with
``quote`` being the quote that need to be used to close current string.
``token_start`` the position where the replacement should start occurring,
``matches`` a list of replacement/completion
prefix_tuple = extra_prefix if extra_prefix else ()
Nprefix = len(prefix_tuple)
def filter_prefix_tuple(key):
# Reject too short keys
if len(key) <= Nprefix:
return False
# Reject keys with non str/bytes in it
for k in key:
if not isinstance(k, (str, bytes)):
return False
# Reject keys that do not match the prefix
for k, pt in zip(key, prefix_tuple):
if k != pt:
return False
# All checks passed!
return True
filtered_keys:List[Union[str,bytes]] = []
def _add_to_filtered_keys(key):
if isinstance(key, (str, bytes)):
for k in keys:
if isinstance(k, tuple):
if filter_prefix_tuple(k):
if not prefix:
return '', 0, [repr(k) for k in filtered_keys]
quote_match = re.search('["\']', prefix)
assert quote_match is not None # silence mypy
quote = quote_match.group()
prefix_str = eval(prefix + quote, {})
except Exception:
return '', 0, []
pattern = '[^' + ''.join('\\' + c for c in delims) + ']*$'
token_match = re.search(pattern, prefix, re.UNICODE)
assert token_match is not None # silence mypy
token_start = token_match.start()
token_prefix = token_match.group()
matched:List[str] = []
for key in filtered_keys:
if not key.startswith(prefix_str):
except (AttributeError, TypeError, UnicodeError):
# Python 3+ TypeError on b'a'.startswith('a') or vice-versa
# reformat remainder of key to begin with prefix
rem = key[len(prefix_str):]
# force repr wrapped in '
rem_repr = repr(rem + '"') if isinstance(rem, str) else repr(rem + b'"')
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 cursor_to_position(text:str, line:int, column:int)->int:
Convert the (line,column) position of the cursor in text to an offset in a
text : str
The text in which to calculate the cursor offset
line : int
Line of the cursor; 0-indexed
column : int
Column of the cursor 0-indexed
Position of the cursor in ``text``, 0-indexed.
See Also
position_to_cursor : reciprocal of this function
lines = text.split('\n')
assert line <= len(lines), '{} <= {}'.format(str(line), str(len(lines)))
return sum(len(l) + 1 for l in lines[:line]) + column
def position_to_cursor(text:str, offset:int)->Tuple[int, int]:
Convert the position of the cursor in text (0 indexed) to a line
number(0-indexed) and a column number (0-indexed) pair
Position should be a valid position in ``text``.
text : str
The text in which to calculate the cursor offset
offset : int
Position of the cursor in ``text``, 0-indexed.
(line, column) : (int, int)
Line of the cursor; 0-indexed, column of the cursor 0-indexed
See Also
cursor_to_position : reciprocal of this function
assert 0 <= offset <= len(text) , "0 <= %s <= %s" % (offset , len(text))
before = text[:offset]
blines = before.split('\n') # ! splitnes trim trailing \n
line = before.count('\n')
col = len(blines[-1])
return line, col
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:str) -> Tuple[str, Sequence[str]]:
"""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 ...
Return a tuple with two elements:
- The Unicode character that was matched (preceded with a backslash), or
empty string,
- a sequence (of 1), name for the match Unicode character, preceded by
backslash, or empty if no match.
if len(text)<2:
return '', ()
maybe_slash = text[-2]
if maybe_slash != '\\':
return '', ()
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 '', ()
try :
unic = unicodedata.name(char)
return '\\'+char,('\\'+unic,)
except KeyError:
return '', ()
def back_latex_name_matches(text:str) -> Tuple[str, Sequence[str]] :
"""Match latex characters back to unicode name
This does ``\\ℵ`` -> ``\\aleph``
if len(text)<2:
return '', ()
maybe_slash = text[-2]
if maybe_slash != '\\':
return '', ()
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 '', ()
try :
latex = reverse_latex_symbol[char]
# '\\' replace the \ as well
return '\\'+char,[latex]
except KeyError:
return '', ()
def _formatparamchildren(parameter) -> str:
Get parameter name and value from Jedi Private API
Jedi does not expose a simple way to get `param=value` from its API.
Jedi's function `Param`
A string like 'a', 'b=1', '*args', '**kwargs'
description = parameter.description
if not description.startswith('param '):
raise ValueError('Jedi function parameter description have change format.'
'Expected "param ...", found %r".' % description)
return description[6:]
def _make_signature(completion)-> str:
Make the signature from a jedi completion
completion : jedi.Completion
object does not complete a function type
a string consisting of the function signature, with the parenthesis but
without the function name. example:
`(a, *args, b=1, **kwargs)`
# it looks like this might work on jedi 0.17
if hasattr(completion, 'get_signatures'):
signatures = completion.get_signatures()
if not signatures:
return '(?)'
c0 = completion.get_signatures()[0]
return '('+c0.to_string().split('(', maxsplit=1)[1]
return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for signature in completion.get_signatures()
for p in signature.defined_names()) if f])
class _CompleteResult(NamedTuple):
matched_text : str
matches: Sequence[str]
matches_origin: Sequence[str]
jedi_matches: Any
class IPCompleter(Completer):
"""Extension of the completer class with IPython-specific features"""
__dict_key_regexps: Optional[Dict[bool,Pattern]] = None
def _greedy_changed(self, change):
"""update the splitter and readline delims when greedy is changed"""
if change['new']:
self.splitter.delims = GREEDY_DELIMS
self.splitter.delims = DELIMS
dict_keys_only = Bool(False,
help="""Whether to show dict key matches only""")
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.
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.
limit_to__all__ = Bool(False,
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
profile_completions = Bool(
help="If True, emit profiling data for completion subsystem using cProfile."
profiler_output_dir = Unicode(
help="Template for path at which to output profile data for completions."
def _limit_to_all_changed(self, change):
warnings.warn('`IPython.core.IPCompleter.limit_to__all__` configuration '
'value has been deprecated since IPython 5.0, will be made to have '
'no effects and then removed in future version of IPython.',
def __init__(self, shell=None, namespace=None, global_namespace=None,
use_readline=_deprecation_readline_sentinel, config=None, **kwargs):
"""IPCompleter() -> completer
Return a completer object.
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 : dict, optional
an optional dict where completions are performed.
global_namespace : dict, optional
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 since IPython 6.0, will have no effects
self.magic_escape = ESC_MAGIC
self.splitter = CompletionSplitter()
if use_readline is not _deprecation_readline_sentinel:
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
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*.*)')
self.magic_arg_matchers = [
# This is set externally by InteractiveShell
self.custom_completers = None
# This is a list of names of unicode characters that can be completed
# into their corresponding unicode value. The list is large, so we
# laziliy initialize it on first use. Consuming code should access this
# attribute through the `@unicode_names` property.
self._unicode_names = None
def matchers(self) -> List[Any]:
"""All active matcher routines for completion"""
if self.dict_keys_only:
return [self.dict_key_matches]
if self.use_jedi:
return [
return [
def all_completions(self, text:str) -> List[str]:
Wrapper around the completion methods for the benefit of emacs.
prefix = text.rpartition('.')[0]
with provisionalcompleter():
return ['.'.join([prefix, c.text]) if prefix and self.use_jedi else c.text
for c in self.completions(text, len(text))]
return self.complete(text)[1]
def _clean_glob(self, text:str):
return self.glob("%s*" % text)
def _clean_glob_win32(self, text:str):
return [f.replace("\\","/")
for f in self.glob("%s*" % text)]
def file_matches(self, text:str)->List[str]:
"""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
# 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'!'
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
# 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]
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
has_protectables = False
text = os.path.expanduser(text)
if text == "":
return [text_prefix + protect_filename(f) for f in self.glob("*")]
# Compute the matches from the filesystem
if sys.platform == 'win32':
m0 = self.clean_glob(text)
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]
if open_quotes:
# if we have a string with an open quote, we don't need to
# protect the names beyond the quote (and we _shouldn't_, as
# it would cause bugs when the filesystem call is made).
matches = m0 if sys.platform == "win32" else\
[protect_filename(f, open_quotes) for f in m0]
matches = [text_prefix +
protect_filename(f) for f in m0]
# Mark directories in input list by appending '/' to their names.
return [x+'/' if os.path.isdir(x) else x for x in matches]
def magic_matches(self, text:str):
"""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
explicit_magic = text.startswith(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
# We also exclude magics that match any currently visible names:
# https://github.com/ipython/ipython/issues/4877, unless the user has
# typed a %:
# https://github.com/ipython/ipython/issues/10754
bare_text = text.lstrip(pre)
global_matches = self.global_matches(bare_text)
if not explicit_magic:
def matches(magic):
Filter magics, in particular remove magics that match
a name present in global namespace.
return ( magic.startswith(bare_text) and
magic not in global_matches )
def matches(magic):
return magic.startswith(bare_text)
comp = [ pre2+m for m in cell_magics if matches(m)]
if not text.startswith(pre2):
comp += [ pre+m for m in line_magics if matches(m)]
return comp
def magic_config_matches(self, text:str) -> List[str]:
""" Match class names and attributes for %config magic """
texts = text.strip().split()
if len(texts) > 0 and (texts[0] == 'config' or texts[0] == '%config'):
# get all configuration classes
classes = sorted(set([ c for c in self.shell.configurables
if c.__class__.class_traits(config=True)
]), key=lambda x: x.__class__.__name__)
classnames = [ c.__class__.__name__ for c in classes ]
# return all classnames if config or %config is given
if len(texts) == 1:
return classnames
# match classname
classname_texts = texts[1].split('.')
classname = classname_texts[0]
classname_matches = [ c for c in classnames
if c.startswith(classname) ]
# return matched classes or the matched class with attributes
if texts[1].find('.') < 0:
return classname_matches
elif len(classname_matches) == 1 and \
classname_matches[0] == classname:
cls = classes[classnames.index(classname)].__class__
help = cls.class_get_help()
# strip leading '--' from cl-args:
help = re.sub(re.compile(r'^--', re.MULTILINE), '', help)
return [ attr.split('=')[0]
for attr in help.strip().splitlines()
if attr.startswith(texts[1]) ]
return []
def magic_color_matches(self, text:str) -> List[str] :
""" Match color schemes for %colors magic"""
texts = text.split()
if text.endswith(' '):
# .split() strips off the trailing whitespace. Add '' back
# so that: '%colors ' -> ['%colors', '']
if len(texts) == 2 and (texts[0] == 'colors' or texts[0] == '%colors'):
prefix = texts[1]
return [ color for color in InspectColors.keys()
if color.startswith(prefix) ]
return []
def _jedi_matches(self, cursor_column:int, cursor_line:int, text:str) -> Iterable[Any]:
Return a list of :any:`jedi.api.Completions` object from a ``text`` and
cursor position.
cursor_column : int
column position of the cursor in ``text``, 0-indexed.
cursor_line : int
line position of the cursor in ``text``, 0-indexed
text : str
text to complete
If ``IPCompleter.debug`` is ``True`` may return a :any:`_FakeJediCompletion`
object containing a string with the Jedi debug information attached.
namespaces = [self.namespace]
if self.global_namespace is not None:
completion_filter = lambda x:x
offset = cursor_to_position(text, cursor_line, cursor_column)
# filter output if we are completing for object members
if offset:
pre = text[offset-1]
if pre == '.':
if self.omit__names == 2:
completion_filter = lambda c:not c.name.startswith('_')
elif self.omit__names == 1:
completion_filter = lambda c:not (c.name.startswith('__') and c.name.endswith('__'))
elif self.omit__names == 0:
completion_filter = lambda x:x
raise ValueError("Don't understand self.omit__names == {}".format(self.omit__names))
interpreter = jedi.Interpreter(text[:offset], namespaces)
try_jedi = True
# find the first token in the current tree -- if it is a ' or " then we are in a string
completing_string = False
first_child = next(c for c in interpreter._get_module().tree_node.children if hasattr(c, 'value'))
except StopIteration:
# note the value may be ', ", or it may also be ''' or """, or
# in some cases, """what/you/typed..., but all of these are
# strings.
completing_string = len(first_child.value) > 0 and first_child.value[0] in {"'", '"'}
# if we are in a string jedi is likely not the right candidate for
# now. Skip it.
try_jedi = not completing_string
except Exception as e:
# many of things can go wrong, we are using private API just don't crash.
if self.debug:
print("Error detecting if completing a non-finished string :", e, '|')
if not try_jedi:
return []
return filter(completion_filter, interpreter.complete(column=cursor_column, line=cursor_line + 1))
except Exception as e:
if self.debug:
return [_FakeJediCompletion('Oops Jedi has crashed, please report a bug with the following:\n"""\n%s\ns"""' % (e))]
return []
def python_matches(self, text:str)->List[str]:
"""Match attributes or global python names"""
if "." in text:
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)
# 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 = []
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:
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):
elif not (inspect.isfunction(obj) or inspect.ismethod(obj)):
if inspect.isclass(obj):
#for cython embedsignature=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__', ''))
_keeps = (inspect.Parameter.KEYWORD_ONLY,
sig = inspect.signature(obj)
ret.extend(k for k, v in sig.parameters.items() if
v.kind in _keeps)
except ValueError:
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
return []
# 2. Concatenate dotted names ("foo.bar" for "foo.bar(x, pa" )
ids = []
isId = re.compile(r'\w+$').match
while True:
if not isId(ids[-1]):
ids.pop(); break
if not next(iterTokens) == '.':
except StopIteration:
# 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:
if next_token != '=':
argMatches = []
callableObj = '.'.join(ids[::-1])
namedArgs = self._default_arguments(eval(callableObj,
# Remove used named arguments from the list, no need to show twice
for namedArg in set(namedArgs) - usedNamedArgs:
if namedArg.startswith(text):
argMatches.append("%s=" %namedArg)
return argMatches
def _get_keys(obj: Any) -> List[Any]:
# 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'):
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 []
def dict_key_matches(self, text:str) -> List[str]:
"Match string keys in a dictionary, after e.g. 'foo[' "
if self.__dict_key_regexps is not None:
regexps = self.__dict_key_regexps
dict_key_re_fmt = r'''(?x)
( # match dict-referring expression wrt greedy setting
\[ # open bracket
\s* # and optional whitespace
# Capture any number of str-like objects (e.g. "a", "b", 'c')
((?:[uUbB]? # string prefix (r not handled)
([uUbB]? # string prefix (r not handled)
(?: # unclosed string
regexps = self.__dict_key_regexps = {
False: re.compile(dict_key_re_fmt % r'''
# identifiers separated by .
True: re.compile(dict_key_re_fmt % '''
match = regexps[self.greedy].search(self.text_until_cursor)
if match is None:
return []
expr, prefix0, prefix = match.groups()
obj = eval(expr, self.namespace)
except Exception:
obj = eval(expr, self.global_namespace)
except Exception:
return []
keys = self._get_keys(obj)
if not keys:
return keys
extra_prefix = eval(prefix0) if prefix0 != '' else None
closing_quote, token_offset, matches = match_dict_keys(keys, prefix, self.splitter.delims, extra_prefix=extra_prefix)
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(3)
completion_start = key_start + token_offset
key_start = completion_start = match.end()
# grab the leading prefix, to make sure all completions start with `text`
if text_start > key_start:
leading = ''
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):]
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(text:str) -> Tuple[str, List[str]] :
"""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.
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:
return '', []
def latex_matches(self, text:str) -> Tuple[str, Sequence[str]]:
"""Match Latex syntax for unicode characters.
This does both ``\\alp`` -> ``\\alpha`` and ``\\alpha`` -> ``α``
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]]
# 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)]
if matches:
return s, matches
return '', ()
def dispatch_custom_completer(self, text):
if not self.custom_completers:
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 = SimpleNamespace()
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)
try_magic = []
for c in itertools.chain(self.custom_completers.s_matches(cmd),
res = c(event)
if res:
# first, try case sensitive match
withcase = [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 [r for r in res if r.lower().startswith(text_low)]
except TryNext:
except KeyboardInterrupt:
If custom completer take too long,
let keyboard interrupt abort and return nothing.
return None
def completions(self, text: str, offset: int)->Iterator[Completion]:
Returns an iterator over the possible completions
.. warning::
This function is unstable, API may change without warning.
It will also raise unless use in proper context manager.
text : str
Full text of the current input, multi line string.
offset : int
Integer representing the position of the cursor in ``text``. Offset
is 0-based indexed.
The cursor on a text can either be seen as being "in between"
characters or "On" a character depending on the interface visible to
the user. For consistency the cursor being on "in between" characters X
and Y is equivalent to the cursor being "on" character Y, that is to say
the character the cursor is on is considered as being after the cursor.
Combining characters may span more that one position in the
.. note::
If ``IPCompleter.debug`` is :any:`True` will yield a ``--jedi/ipython--``
fake Completion token to distinguish completion returned by Jedi
and usual IPython completion.
.. note::
Completions are not completely deduplicated yet. If identical
completions are coming from different sources this function does not
ensure that each completion object will only be present once.
warnings.warn("_complete is a provisional API (as of IPython 6.0). "
"It may change without warnings. "
"Use in corresponding context manager.",
category=ProvisionalCompleterWarning, stacklevel=2)
seen = set()
if self.profile_completions:
import cProfile
profiler = cProfile.Profile()
profiler = None
for c in self._completions(text, offset, _timeout=self.jedi_compute_type_timeout/1000):
if c and (c in seen):
yield c
except KeyboardInterrupt:
"""if completions take too long and users send keyboard interrupt,
do not crash and return ASAP. """
if profiler is not None:
output_path = os.path.join(self.profiler_output_dir, str(uuid.uuid4()))
print("Writing profiler output to", output_path)
def _completions(self, full_text: str, offset: int, *, _timeout) -> Iterator[Completion]:
Core completion module.Same signature as :any:`completions`, with the
extra `timeout` parameter (in seconds).
Computing jedi's completion ``.type`` can be quite expensive (it is a
lazy property) and can require some warm-up, more warm up than just
computing the ``name`` of a completion. The warm-up can be :
- Long warm-up the first time a module is encountered after
install/update: actually build parse/inference tree.
- first time the module is encountered in a session: load tree from
We don't want to block completions for tens of seconds so we give the
completer a "budget" of ``_timeout`` seconds per invocation to compute
completions types, the completions that have not yet been computed will
be marked as "unknown" an will have a chance to be computed next round
are things get cached.
Keep in mind that Jedi is not the only thing treating the completion so
keep the timeout short-ish as if we take more than 0.3 second we still
have lots of processing to do.
deadline = time.monotonic() + _timeout
before = full_text[:offset]
cursor_line, cursor_column = position_to_cursor(full_text, offset)
matched_text, matches, matches_origin, jedi_matches = self._complete(
full_text=full_text, cursor_line=cursor_line, cursor_pos=cursor_column)
iter_jm = iter(jedi_matches)
if _timeout:
for jm in iter_jm:
type_ = jm.type
except Exception:
if self.debug:
print("Error in Jedi getting type of ", jm)
type_ = None
delta = len(jm.name_with_symbols) - len(jm.complete)
if type_ == 'function':
signature = _make_signature(jm)
signature = ''
yield Completion(start=offset - delta,
if time.monotonic() > deadline:
for jm in iter_jm:
delta = len(jm.name_with_symbols) - len(jm.complete)
yield Completion(start=offset - delta,
type='<unknown>', # don't compute type for speed
start_offset = before.rfind(matched_text)
# Suppress this, right now just for debug.
if jedi_matches and matches and self.debug:
yield Completion(start=start_offset, end=offset, text='--jedi/ipython--',
_origin='debug', type='none', signature='')
# I'm unsure if this is always true, so let's assert and see if it
# crash
assert before.endswith(matched_text)
for m, t in zip(matches, matches_origin):
yield Completion(start=start_offset, end=offset, text=m, _origin=t, signature='', type='<unknown>')
def complete(self, text=None, line_buffer=None, cursor_pos=None) -> Tuple[str, Sequence[str]]:
"""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.
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.