bpython/bpython/autocomplete.py at master · benkrig/bpython · GitHub

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# coding: utf-8

# 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.

from __future__ import unicode_literals, absolute_import

import __main__

import abc

import glob

import keyword

import logging

import os

import re

import rlcompleter

from six.moves import range, builtins

from six import string_types, iteritems

from . import inspection

from . import importcompletion

from . import line as lineparts

from .line import LinePart

from ._py3compat import py3, try_decode

from .lazyre import LazyReCompile

from .simpleeval import (safe_eval, evaluate_current_expression,

EvaluationError)

if not py3:

from types import InstanceType, ClassType

# Autocomplete modes

SIMPLE = 'simple'

SUBSTRING = 'substring'

FUZZY = 'fuzzy'

ALL_MODES = (SIMPLE, SUBSTRING, FUZZY)

MAGIC_METHODS = tuple("__%s__" % s for s in (

"init", "repr", "str", "lt", "le", "eq", "ne", "gt", "ge", "cmp", "hash",

"nonzero", "unicode", "getattr", "setattr", "get", "set", "call", "len",

"getitem", "setitem", "iter", "reversed", "contains", "add", "sub", "mul",

"floordiv", "mod", "divmod", "pow", "lshift", "rshift", "and", "xor", "or",

"div", "truediv", "neg", "pos", "abs", "invert", "complex", "int", "float",

"oct", "hex", "index", "coerce", "enter", "exit"))

if py3:

KEYWORDS = frozenset(keyword.kwlist)

else:

KEYWORDS = frozenset(name.decode('ascii') for name in keyword.kwlist)

def after_last_dot(name):

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

def few_enough_underscores(current, match):

"""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

elif match.startswith('_'):

return False

else:

return True

def method_match_simple(word, size, text):

return word[:size] == text

def method_match_substring(word, size, text):

return text in word

def method_match_fuzzy(word, size, text):

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

return re.search(s, word)

MODES_MAP = {

SIMPLE: method_match_simple,

SUBSTRING: method_match_substring,

FUZZY: method_match_fuzzy

}

class BaseCompletionType(object):

"""Describes different completion types"""

def __init__(self, shown_before_tab=True, mode=SIMPLE):

self._shown_before_tab = shown_before_tab

self.method_match = MODES_MAP[mode]

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

"""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):

"""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):

"""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.end:]

return offset, changed_line

@property

def shown_before_tab(self):

"""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=SIMPLE):

if not completers:

raise ValueError(

"CumulativeCompleter requires at least one completer")

self._completers = completers

super(CumulativeCompleter, self).__init__(True, mode)

def locate(self, current_offset, line):

return self._completers[0].locate(current_offset, line)

def format(self, word):

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

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

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

return importcompletion.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=SIMPLE):

super(FilenameCompletion, self).__init__(False, mode)

if py3:

def safe_glob(self, pathname):

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

else:

def safe_glob(self, pathname):

try:

return glob.glob(pathname + '*')

except re.error:

# see #491

return tuple()

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

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):

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 = set(''.join([r.word[:-i], m])

for m in self.attr_matches(methodtext, locals_))

return set(m 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):

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

"""

# Gna, Py 2.6's rlcompleter searches for __call__ inside the

# instance instead of the type, so we monkeypatch to prevent

# side-effects (__getattr__/__getattribute__)

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 []

with inspection.AttrCleaner(obj):

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

return matches

def attr_lookup(self, obj, expr, attr):

"""Second half of original attr_matches method factored out so it can

be wrapped in a safe try/finally block in case anything bad happens to

restore the original __getattribute__ method."""

words = self.list_attributes(obj)

if hasattr(obj, '__class__'):

words.append('__class__')

words = words + rlcompleter.get_class_members(obj.__class__)

if not isinstance(obj.__class__, abc.ABCMeta):

try:

words.remove('__abstractmethods__')

except ValueError:

pass

if not py3 and isinstance(obj, (InstanceType, ClassType)):

# Account for the __dict__ in an old-style class.

words.append('__dict__')

matches = []

n = len(attr)

for word in words:

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

matches.append("%s.%s" % (expr, word))

return matches

if py3:

def list_attributes(self, obj):

return dir(obj)

else:

def list_attributes(self, obj):

if isinstance(obj, InstanceType):

try:

return dir(obj)

except Exception:

# This is a case where we can not prevent user code from

# running. We return a default list attributes on error

# instead. (#536)

return ['__doc__', '__module__']

else:

return dir(obj)

class DictKeyCompletion(BaseCompletionType):

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

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 = set("{0!r}]".format(k) 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):

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):

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 set(name for name in MAGIC_METHODS if name.startswith(r.word))

def locate(self, current_offset, line):

return lineparts.current_method_definition_name(current_offset, line)

class GlobalCompletion(BaseCompletionType):

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

"""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 iteritems(nspace):

word = try_decode(word, 'ascii')

# 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):

return lineparts.current_single_word(current_offset, line)

class ParameterNameCompletion(BaseCompletionType):

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

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 = set(name + '=' for name in argspec[1][0]

if isinstance(name, string_types) and

name.startswith(r.word))

if py3:

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):

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):

return lineparts.current_expression_attribute(current_offset, line)

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

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()

with inspection.AttrCleaner(obj):

# strips leading dot

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

return set(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):

return None

else:

class JediCompletion(BaseCompletionType):

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

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, len(history.splitlines()),

cursor_offset, 'fake.py')

completions = script.completions()

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 = [try_decode(c.name, 'ascii') 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 set(m for m in matches if m.startswith(first_letter))

def locate(self, cursor_offset, line):

start = self._orig_start

end = cursor_offset

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

class MultilineJediCompletion(JediCompletion):

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

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" % (cursor_offset,

line)

results = super(MultilineJediCompletion,

self).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=SIMPLE):

return (

DictKeyCompletion(mode=mode),

ImportCompletion(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),

)

def get_completer_bpython(cursor_offset, line, **kwargs):

""""""

return get_completer(get_default_completer(),

cursor_offset, line, **kwargs)

def _callable_postfix(value, word):

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

with inspection.AttrCleaner(value):

if inspection.is_callable(value):

word += '('

return word

bpython/bpython/autocomplete.py at master · benkrig/bpython · GitHub

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