bpython/bpython/autocomplete.py at main · Playfloor/bpython · GitHub

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# The MIT License

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

# THE SOFTWARE.

import __main__

import abc

import glob

import keyword

import logging

import os

import re

import rlcompleter

import builtins

from enum import Enum

from typing import Any, Dict, Iterator, List, Match, NoReturn, Set, Union

from . import inspection

from . import line as lineparts

from .line import LinePart

from .lazyre import LazyReCompile

from .simpleeval import safe_eval, evaluate_current_expression, EvaluationError

# Autocomplete modes

class AutocompleteModes(Enum):

NONE = "none"

SIMPLE = "simple"

SUBSTRING = "substring"

FUZZY = "fuzzy"

@classmethod

def from_string(cls, value) -> Union[Any, None]:

if value.upper() in cls.__members__:

return cls.__members__[value.upper()]

return None

MAGIC_METHODS = tuple(

f"__{s}__"

for s in (

"new",

"init",

"del",

"repr",

"str",

"bytes",

"format",

"lt",

"le",

"eq",

"ne",

"gt",

"ge",

"hash",

"bool",

"getattr",

"getattribute",

"setattr",

"delattr",

"dir",

"get",

"set",

"delete",

"set_name",

"init_subclass",

"instancecheck",

"subclasscheck",

"class_getitem",

"call",

"len",

"length_hint",

"getitem",

"setitem",

"delitem",

"missing",

"iter",

"reversed",

"contains",

"add",

"sub",

"mul",

"matmul",

"truediv",

"floordiv",

"mod",

"divmod",

"pow",

"lshift",

"rshift",

"and",

"xor",

"or",

"radd",

"rsub",

"rmul",

"rmatmul",

"rtruediv",

"rfloordiv",

"rmod",

"rdivmod",

"rpow",

"rlshift",

"rrshift",

"rand",

"rxor",

"ror",

"iadd",

"isub",

"imul",

"imatmul",

"itruediv",

"ifloordiv",

"imod",

"ipow",

"ilshift",

"irshift",

"iand",

"ixor",

"neg",

"pos",

"abs",

"invert",

"complex",

"int",

"float",

"index",

"round",

"trunc",

"floor",

"ceil",

"enter",

"exit",

"await",

"aiter",

"anext",

"aenter",

"aexit",

)

KEYWORDS = frozenset(keyword.kwlist)

def after_last_dot(name: str) -> str:

return name.rstrip(".").rsplit(".")[-1]

def few_enough_underscores(current, match) -> bool:

"""Returns whether match should be shown based on current

if current is _, True if match starts with 0 or 1 underscore

if current is __, True regardless of match

otherwise True if match does not start with any underscore

"""

if current.startswith("__"):

return True

elif current.startswith("_") and not match.startswith("__"):

return True

return not match.startswith("_")

def method_match_none(word, size, text) -> False:

return False

def method_match_simple(word, size, text) -> bool:

return word[:size] == text

def method_match_substring(word, size, text) -> bool:

return text in word

def method_match_fuzzy(word, size, text) -> Union[Match, None]:

s = r".*%s.*" % ".*".join(list(text))

return re.search(s, word)

MODES_MAP = {

AutocompleteModes.NONE: method_match_none,

AutocompleteModes.SIMPLE: method_match_simple,

AutocompleteModes.SUBSTRING: method_match_substring,

AutocompleteModes.FUZZY: method_match_fuzzy,

}

class BaseCompletionType:

"""Describes different completion types"""

def __init__(

self, shown_before_tab: bool = True, mode=AutocompleteModes.SIMPLE

) -> None:

self._shown_before_tab = shown_before_tab

self.method_match = MODES_MAP[mode]

def matches(self, cursor_offset, line, **kwargs) -> NoReturn:

"""Returns a list of possible matches given a line and cursor, or None

if this completion type isn't applicable.

ie, import completion doesn't make sense if there cursor isn't after

an import or from statement, so it ought to return None.

Completion types are used to:

* `locate(cur, line)` their initial target word to replace given a

line and cursor

* find `matches(cur, line)` that might replace that word

* `format(match)` matches to be displayed to the user

* determine whether suggestions should be `shown_before_tab`

* `substitute(cur, line, match)` in a match for what's found with

`target`

"""

raise NotImplementedError

def locate(self, cursor_offset, line) -> NoReturn:

"""Returns a Linepart namedtuple instance or None given cursor and line

A Linepart namedtuple contains a start, stop, and word. None is

returned if no target for this type of completion is found under

the cursor."""

raise NotImplementedError

def format(self, word):

return word

def substitute(self, cursor_offset, line, match) -> NoReturn:

"""Returns a cursor offset and line with match swapped in"""

lpart = self.locate(cursor_offset, line)

offset = lpart.start + len(match)

changed_line = line[: lpart.start] + match + line[lpart.stop :]

return offset, changed_line

@property

def shown_before_tab(self) -> bool:

"""Whether suggestions should be shown before the user hits tab, or only

once that has happened."""

return self._shown_before_tab

class CumulativeCompleter(BaseCompletionType):

"""Returns combined matches from several completers"""

def __init__(self, completers, mode=AutocompleteModes.SIMPLE) -> None:

if not completers:

raise ValueError(

"CumulativeCompleter requires at least one completer"

)

self._completers = completers

super().__init__(True, mode)

def locate(self, current_offset, line) -> Union[None, NoReturn]:

for completer in self._completers:

return_value = completer.locate(current_offset, line)

if return_value is not None:

return return_value

def format(self, word):

return self._completers[0].format(word)

def matches(self, cursor_offset, line, **kwargs) -> Union[None, Set]:

return_value = None

all_matches = set()

for completer in self._completers:

matches = completer.matches(

cursor_offset=cursor_offset, line=line, **kwargs

)

if matches is not None:

all_matches.update(matches)

return_value = all_matches

return return_value

class ImportCompletion(BaseCompletionType):

def __init__(self, module_gatherer, mode=AutocompleteModes.SIMPLE):

super().__init__(False, mode)

self.module_gatherer = module_gatherer

def matches(self, cursor_offset, line, **kwargs):

return self.module_gatherer.complete(cursor_offset, line)

def locate(self, current_offset, line):

return lineparts.current_word(current_offset, line)

def format(self, word):

return after_last_dot(word)

class FilenameCompletion(BaseCompletionType):

def __init__(self, mode=AutocompleteModes.SIMPLE):

super().__init__(False, mode)

def safe_glob(self, pathname) -> Iterator:

return glob.iglob(glob.escape(pathname) + "*")

def matches(self, cursor_offset, line, **kwargs) -> Union[None, set]:

cs = lineparts.current_string(cursor_offset, line)

if cs is None:

return None

matches = set()

username = cs.word.split(os.path.sep, 1)[0]

user_dir = os.path.expanduser(username)

for filename in self.safe_glob(os.path.expanduser(cs.word)):

if os.path.isdir(filename):

filename += os.path.sep

if cs.word.startswith("~"):

filename = username + filename[len(user_dir) :]

matches.add(filename)

return matches

def locate(self, current_offset, line):

return lineparts.current_string(current_offset, line)

def format(self, filename):

filename.rstrip(os.sep).rsplit(os.sep)[-1]

if os.sep in filename[:-1]:

return filename[filename.rindex(os.sep, 0, -1) + 1 :]

else:

return filename

class AttrCompletion(BaseCompletionType):

attr_matches_re = LazyReCompile(r"(\w+(\.\w+)*)\.(\w*)")

def matches(self, cursor_offset, line, **kwargs) -> Union[None, Dict]:

if "locals_" not in kwargs:

return None

locals_ = kwargs["locals_"]

r = self.locate(cursor_offset, line)

if r is None:

return None

if locals_ is None: # TODO add a note about why

locals_ = __main__.__dict__

assert "." in r.word

for i in range(1, len(r.word) + 1):

if r.word[-i] == "[":

i -= 1

break

methodtext = r.word[-i:]

matches = {

"".join([r.word[:-i], m])

for m in self.attr_matches(methodtext, locals_)

}

return {

for m in matches

if few_enough_underscores(r.word.split(".")[-1], m.split(".")[-1])

}

def locate(self, current_offset, line):

return lineparts.current_dotted_attribute(current_offset, line)

def format(self, word):

return after_last_dot(word)

def attr_matches(self, text, namespace) -> List:

"""Taken from rlcompleter.py and bent to my will."""

m = self.attr_matches_re.match(text)

if not m:

return []

expr, attr = m.group(1, 3)

if expr.isdigit():

# Special case: float literal, using attrs here will result in

# a SyntaxError

return []

try:

obj = safe_eval(expr, namespace)

except EvaluationError:

return []

matches = self.attr_lookup(obj, expr, attr)

return matches

def attr_lookup(self, obj, expr, attr) -> List:

"""Second half of attr_matches."""

words = self.list_attributes(obj)

if inspection.hasattr_safe(obj, "__class__"):

words.append("__class__")

klass = inspection.getattr_safe(obj, "__class__")

words = words + rlcompleter.get_class_members(klass)

if not isinstance(klass, abc.ABCMeta):

try:

words.remove("__abstractmethods__")

except ValueError:

pass

matches = []

n = len(attr)

for word in words:

if self.method_match(word, n, attr) and word != "__builtins__":

matches.append(f"{expr}.{word}")

return matches

def list_attributes(self, obj) -> List[str]:

# TODO: re-implement dir using getattr_static to avoid using

# AttrCleaner here?

with inspection.AttrCleaner(obj):

return dir(obj)

class DictKeyCompletion(BaseCompletionType):

def matches(self, cursor_offset, line, **kwargs) -> Union[None, Dict]:

if "locals_" not in kwargs:

return None

locals_ = kwargs["locals_"]

r = self.locate(cursor_offset, line)

if r is None:

return None

_, _, dexpr = lineparts.current_dict(cursor_offset, line)

try:

obj = safe_eval(dexpr, locals_)

except EvaluationError:

return None

if isinstance(obj, dict) and obj.keys():

matches = {

f"{k!r}]" for k in obj.keys() if repr(k).startswith(r.word)

}

return matches if matches else None

else:

return None

def locate(self, current_offset, line) -> Union[LinePart, None]:

return lineparts.current_dict_key(current_offset, line)

def format(self, match):

return match[:-1]

class MagicMethodCompletion(BaseCompletionType):

def matches(self, cursor_offset, line, **kwargs) -> Union[None, Dict]:

if "current_block" not in kwargs:

return None

current_block = kwargs["current_block"]

r = self.locate(cursor_offset, line)

if r is None:

return None

if "class" not in current_block:

return None

return {name for name in MAGIC_METHODS if name.startswith(r.word)}

def locate(self, current_offset, line) -> Union[LinePart, None]:

return lineparts.current_method_definition_name(current_offset, line)

class GlobalCompletion(BaseCompletionType):

def matches(self, cursor_offset, line, **kwargs) -> Union[Set, None]:

"""Compute matches when text is a simple name.

Return a list of all keywords, built-in functions and names currently

defined in self.namespace that match.

"""

if "locals_" not in kwargs:

return None

locals_ = kwargs["locals_"]

r = self.locate(cursor_offset, line)

if r is None:

return None

matches = set()

n = len(r.word)

for word in KEYWORDS:

if self.method_match(word, n, r.word):

matches.add(word)

for nspace in (builtins.__dict__, locals_):

for word, val in nspace.items():

# if identifier isn't ascii, don't complete (syntax error)

if word is None:

continue

if (

self.method_match(word, n, r.word)

and word != "__builtins__"

matches.add(_callable_postfix(val, word))

return matches if matches else None

def locate(self, current_offset, line) -> Union[LinePart, None]:

return lineparts.current_single_word(current_offset, line)

class ParameterNameCompletion(BaseCompletionType):

def matches(self, cursor_offset, line, **kwargs) -> Union[None, Dict]:

if "argspec" not in kwargs:

return None

argspec = kwargs["argspec"]

if not argspec:

return None

r = self.locate(cursor_offset, line)

if r is None:

return None

if argspec:

matches = {

f"{name}="

for name in argspec[1][0]

if isinstance(name, str) and name.startswith(r.word)

}

matches.update(

name + "=" for name in argspec[1][4] if name.startswith(r.word)

)

return matches if matches else None

def locate(self, current_offset, line) -> Union[LinePart, None]:

return lineparts.current_word(current_offset, line)

class ExpressionAttributeCompletion(AttrCompletion):

# could replace attr completion as a more general case with some work

def locate(self, current_offset, line) -> Union[LinePart, None]:

return lineparts.current_expression_attribute(current_offset, line)

def matches(self, cursor_offset, line, **kwargs) -> Union[Set, Dict, None]:

if "locals_" not in kwargs:

return None

locals_ = kwargs["locals_"]

if locals_ is None:

locals_ = __main__.__dict__

attr = self.locate(cursor_offset, line)

try:

obj = evaluate_current_expression(cursor_offset, line, locals_)

except EvaluationError:

return set()

# strips leading dot

matches = (m[1:] for m in self.attr_lookup(obj, "", attr.word))

return {m for m in matches if few_enough_underscores(attr.word, m)}

try:

import jedi

except ImportError:

class MultilineJediCompletion(BaseCompletionType):

def matches(self, cursor_offset, line, **kwargs) -> None:

return None

else:

class JediCompletion(BaseCompletionType):

def matches(self, cursor_offset, line, **kwargs) -> Union[None, Dict]:

if "history" not in kwargs:

return None

history = kwargs["history"]

if not lineparts.current_word(cursor_offset, line):

return None

history = "\n".join(history) + "\n" + line

try:

script = jedi.Script(history, path="fake.py")

completions = script.complete(

len(history.splitlines()), cursor_offset

)

except (jedi.NotFoundError, IndexError, KeyError):

# IndexError for #483

# KeyError for #544

self._orig_start = None

return None

if completions:

diff = len(completions[0].name) - len(completions[0].complete)

self._orig_start = cursor_offset - diff

else:

self._orig_start = None

return None

first_letter = line[self._orig_start : self._orig_start + 1]

matches = [c.name for c in completions]

if any(

not m.lower().startswith(matches[0][0].lower()) for m in matches

# Too general - giving completions starting with multiple

# letters

return None

else:

# case-sensitive matches only

return {m for m in matches if m.startswith(first_letter)}

def locate(self, cursor_offset, line) -> LinePart:

start = self._orig_start

end = cursor_offset

return LinePart(start, end, line[start:end])

class MultilineJediCompletion(JediCompletion):

def matches(self, cursor_offset, line, **kwargs) -> Union[Dict, None]:

if "current_block" not in kwargs or "history" not in kwargs:

return None

current_block = kwargs["current_block"]

history = kwargs["history"]

if "\n" in current_block:

assert cursor_offset <= len(line), "{!r} {!r}".format(

cursor_offset,

line,

)

results = super().matches(cursor_offset, line, history=history)

return results

else:

return None

def get_completer(completers, cursor_offset, line, **kwargs):

"""Returns a list of matches and an applicable completer

If no matches available, returns a tuple of an empty list and None

cursor_offset is the current cursor column

line is a string of the current line

kwargs (all optional):

locals_ is a dictionary of the environment

argspec is an inspect.ArgSpec instance for the current function where

the cursor is

current_block is the possibly multiline not-yet-evaluated block of

code which the current line is part of

complete_magic_methods is a bool of whether we ought to complete

double underscore methods like __len__ in method signatures

"""

for completer in completers:

try:

matches = completer.matches(cursor_offset, line, **kwargs)

except Exception as e:

# Instead of crashing the UI, log exceptions from autocompleters.

logger = logging.getLogger(__name__)

logger.debug(

"Completer {} failed with unhandled exception: {}".format(

completer, e

)

continue

if matches is not None:

return sorted(matches), (completer if matches else None)

return [], None

def get_default_completer(mode=AutocompleteModes.SIMPLE, module_gatherer=None):

return (

(

DictKeyCompletion(mode=mode),

ImportCompletion(module_gatherer, mode=mode),

FilenameCompletion(mode=mode),

MagicMethodCompletion(mode=mode),

MultilineJediCompletion(mode=mode),

CumulativeCompleter(

(

GlobalCompletion(mode=mode),

ParameterNameCompletion(mode=mode),

mode=mode,

AttrCompletion(mode=mode),

ExpressionAttributeCompletion(mode=mode),

)

if mode != AutocompleteModes.NONE

else tuple()

)

def _callable_postfix(value, word):

"""rlcompleter's _callable_postfix done right."""

if callable(value):

word += "("

return word

bpython/bpython/autocomplete.py at main · Playfloor/bpython · GitHub

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