pythonVSCode/pythonFiles/preview/jedi/parser/utils.py at master · GuloWang/pythonVSCode · GitHub

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import inspect

import time

import os

import sys

import json

import hashlib

import gc

import shutil

import pickle

from jedi import settings

from jedi import debug

def underscore_memoization(func):

"""

Decorator for methods::

class A(object):

def x(self):

if self._x:

self._x = 10

return self._x

Becomes::

class A(object):

@underscore_memoization

def x(self):

return 10

A now has an attribute ``_x`` written by this decorator.

"""

name = '_' + func.__name__

def wrapper(self):

try:

return getattr(self, name)

except AttributeError:

result = func(self)

if inspect.isgenerator(result):

result = list(result)

setattr(self, name, result)

return result

return wrapper

# for fast_parser, should not be deleted

parser_cache = {}

class ParserCacheItem(object):

def __init__(self, parser, change_time=None):

self.parser = parser

if change_time is None:

change_time = time.time()

self.change_time = change_time

def load_parser(path):

"""

Returns the module or None, if it fails.

"""

p_time = os.path.getmtime(path) if path else None

try:

parser_cache_item = parser_cache[path]

if not path or p_time <= parser_cache_item.change_time:

return parser_cache_item.parser

except KeyError:

if settings.use_filesystem_cache:

return ParserPickling.load_parser(path, p_time)

def save_parser(path, parser, pickling=True):

try:

p_time = None if path is None else os.path.getmtime(path)

except OSError:

p_time = None

pickling = False

item = ParserCacheItem(parser, p_time)

parser_cache[path] = item

if settings.use_filesystem_cache and pickling:

ParserPickling.save_parser(path, item)

class ParserPickling(object):

version = 26

"""

Version number (integer) for file system cache.

Increment this number when there are any incompatible changes in

parser representation classes. For example, the following changes

are regarded as incompatible.

- Class name is changed.

- Class is moved to another module.

- Defined slot of the class is changed.

"""

def __init__(self):

self.__index = None

self.py_tag = 'cpython-%s%s' % sys.version_info[:2]

"""

Short name for distinguish Python implementations and versions.

It's like `sys.implementation.cache_tag` but for Python < 3.3

we generate something similar. See:

http://docs.python.org/3/library/sys.html#sys.implementation

.. todo:: Detect interpreter (e.g., PyPy).

"""

def load_parser(self, path, original_changed_time):

try:

pickle_changed_time = self._index[path]

except KeyError:

return None

if original_changed_time is not None \

and pickle_changed_time < original_changed_time:

# the pickle file is outdated

return None

with open(self._get_hashed_path(path), 'rb') as f:

try:

gc.disable()

parser_cache_item = pickle.load(f)

finally:

gc.enable()

debug.dbg('pickle loaded: %s', path)

parser_cache[path] = parser_cache_item

return parser_cache_item.parser

def save_parser(self, path, parser_cache_item):

self.__index = None

try:

files = self._index

except KeyError:

files = {}

self._index = files

with open(self._get_hashed_path(path), 'wb') as f:

pickle.dump(parser_cache_item, f, pickle.HIGHEST_PROTOCOL)

files[path] = parser_cache_item.change_time

self._flush_index()

@property

def _index(self):

if self.__index is None:

try:

with open(self._get_path('index.json')) as f:

data = json.load(f)

except (IOError, ValueError):

self.__index = {}

else:

# 0 means version is not defined (= always delete cache):

if data.get('version', 0) != self.version:

self.clear_cache()

else:

self.__index = data['index']

return self.__index

def _remove_old_modules(self):

# TODO use

change = False

if change:

self._flush_index(self)

self._index # reload index

def _flush_index(self):

data = {'version': self.version, 'index': self._index}

with open(self._get_path('index.json'), 'w') as f:

json.dump(data, f)

self.__index = None

def clear_cache(self):

shutil.rmtree(self._cache_directory())

self.__index = {}

def _get_hashed_path(self, path):

return self._get_path('%s.pkl' % hashlib.md5(path.encode("utf-8")).hexdigest())

def _get_path(self, file):

dir = self._cache_directory()

if not os.path.exists(dir):

os.makedirs(dir)

return os.path.join(dir, file)

def _cache_directory(self):

return os.path.join(settings.cache_directory, self.py_tag)

# is a singleton

ParserPickling = ParserPickling()

pythonVSCode/pythonFiles/preview/jedi/parser/utils.py at master · GuloWang/pythonVSCode · GitHub

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