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import os

import io

import re

import sys

import json

import traceback

sys.path.append(os.path.dirname(__file__))

import jedi

# remove jedi from path after we import it so it will not be completed

sys.path.pop(0)

WORD_RE = re.compile(r'\w')

class JediCompletion(object):

basic_types = {

'module': 'import',

'instance': 'variable',

'statement': 'value',

'param': 'variable',

}

def __init__(self):

self.default_sys_path = sys.path

self._input = io.open(sys.stdin.fileno(), encoding='utf-8')

def _get_definition_type(self, definition):

is_built_in = definition.in_builtin_module

if definition.type not in ['import', 'keyword'] and is_built_in():

return 'builtin'

if definition.type in ['statement'] and definition.name.isupper():

return 'constant'

return self.basic_types.get(definition.type, definition.type)

def _additional_info(self, completion):

"""Provide additional information about the completion object."""

if completion._definition is None:

return ''

if completion.type == 'statement':

nodes_to_display = ['InstanceElement', 'String', 'Node', 'Lambda',

'Number']

return ''.join(c.get_code() for c in

completion._definition.children if type(c).__name__

in nodes_to_display).replace('\n', '')

return ''

@classmethod

def _get_top_level_module(cls, path):

"""Recursively walk through directories looking for top level module.

Jedi will use current filepath to look for another modules at same

path, but it will not be able to see modules **above**, so our goal

is to find the higher python module available from filepath.

"""

_path, _ = os.path.split(path)

if os.path.isfile(os.path.join(_path, '__init__.py')):

return cls._get_top_level_module(_path)

return path

def _generate_signature(self, completion):

"""Generate signature with function arguments.

"""

if not hasattr(completion, 'params'):

return ''

return '%s(%s)' % (

completion.name,

', '.join(param.description for param in completion.params))

def _get_call_signatures(self, script):

"""Extract call signatures from jedi.api.Script object in failsafe way.

Returns:

Tuple with original signature object, name and value.

"""

_signatures = []

try:

call_signatures = script.call_signatures()

except KeyError:

call_signatures = []

for signature in call_signatures:

for pos, param in enumerate(signature.params):

if not param.name:

continue

if param.name == 'self' and pos == 0:

continue

if WORD_RE.match(param.name) is None:

continue

try:

name, value = param.description.split('=')

except ValueError:

name = param.description

value = None

if name.startswith('*'):

continue

_signatures.append((signature, name, value))

return _signatures

def _get_call_signatures_with_args(self, script):

"""Extract call signatures from jedi.api.Script object in failsafe way.

Returns:

Array with dictionary

"""

_signatures = []

try:

call_signatures = script.call_signatures()

except KeyError:

call_signatures = []

for signature in call_signatures:

sig = {"name": "", "description": "", "docstring": "",

"paramindex": 0, "params": [], "bracketstart": []}

sig["description"] = signature.description

sig["docstring"] = signature.docstring()

sig["name"] = signature.name

sig["paramindex"] = signature.index

sig["bracketstart"].append(signature.index)

_signatures.append(sig)

for pos, param in enumerate(signature.params):

if not param.name:

continue

if param.name == 'self' and pos == 0:

continue

if WORD_RE.match(param.name) is None:

continue

try:

name, value = param.description.split('=')

except ValueError:

name = param.description

value = None

#if name.startswith('*'):

# continue

#_signatures.append((signature, name, value))

sig["params"].append({"name": name, "value":value, "docstring":param.docstring(), "description":param.description})

return _signatures

def _serialize_completions(self, script, identifier=None, prefix=''):

"""Serialize response to be read from VSCode.

Args:

script: Instance of jedi.api.Script object.

identifier: Unique completion identifier to pass back to VSCode.

prefix: String with prefix to filter function arguments.

Used only when fuzzy matcher turned off.

Returns:

Serialized string to send to VSCode.

"""

_completions = []

for signature, name, value in self._get_call_signatures(script):

if not self.fuzzy_matcher and not name.lower().startswith(

prefix.lower()):

continue

_completion = {

'type': 'property',

'rightLabel': self._additional_info(signature)

}

# we pass 'text' here only for fuzzy matcher

if value:

_completion['snippet'] = '%s=${1:%s}$0' % (name, value)

_completion['text'] = '%s=%s' % (name, value)

else:

_completion['snippet'] = '%s=$1$0' % name

_completion['text'] = name

_completion['displayText'] = name

if self.show_doc_strings:

_completion['description'] = signature.docstring()

else:

_completion['description'] = self._generate_signature(

signature)

_completions.append(_completion)

try:

completions = script.completions()

except KeyError:

completions = []

for completion in completions:

if self.show_doc_strings:

description = completion.docstring()

else:

description = self._generate_signature(completion)

_completion = {

'text': completion.name,

'type': self._get_definition_type(completion),

'description': description,

'rightLabel': self._additional_info(completion)

}

if any([c['text'].split('=')[0] == _completion['text']

for c in _completions]):

# ignore function arguments we already have

continue

_completions.append(_completion)

return json.dumps({'id': identifier, 'results': _completions})

def _serialize_arguments(self, script, identifier=None):

"""Serialize response to be read from VSCode.

Args:

script: Instance of jedi.api.Script object.

identifier: Unique completion identifier to pass back to VSCode.

Returns:

Serialized string to send to VSCode.

"""

return json.dumps({"id": identifier, "results" : self._get_call_signatures_with_args(script) })

def _serialize_definitions(self, definitions, identifier=None):

"""Serialize response to be read from VSCode.

Args:

definitions: List of jedi.api.classes.Definition objects.

identifier: Unique completion identifier to pass back to VSCode.

Returns:

Serialized string to send to VSCode.

"""

def _top_definition(definition):

for d in definition.goto_assignments():

if d == definition:

continue

if d.type == 'import':

return _top_definition(d)

else:

return d

return definition

_definitions = []

for definition in definitions:

try:

if definition.module_path:

if definition.type == 'import':

definition = _top_definition(definition)

_definition = {

'text': definition.name,

'type': self._get_definition_type(definition),

'fileName': definition.module_path,

'line': definition.line - 1,

'column': definition.column

}

_definitions.append(_definition)

except Exception as e:

pass

return json.dumps({'id': identifier, 'results': _definitions})

def _serialize_usages(self, usages, identifier=None):

_usages = []

for usage in usages:

_usages.append({

'name': usage.name,

'moduleName': usage.module_name,

'fileName': usage.module_path,

'line': usage.line,

'column': usage.column,

})

return json.dumps({'id': identifier, 'results': _usages})

def _deserialize(self, request):

"""Deserialize request from VSCode.

Args:

request: String with raw request from VSCode.

Returns:

Python dictionary with request data.

"""

return json.loads(request)

def _set_request_config(self, config):

"""Sets config values for current request.

This includes sys.path modifications which is getting restored to

default value on each request so each project should be isolated

from each other.

Args:

config: Dictionary with config values.

"""

sys.path = self.default_sys_path

self.use_snippets = config.get('useSnippets')

self.show_doc_strings = config.get('showDescriptions', True)

self.fuzzy_matcher = config.get('fuzzyMatcher', False)

jedi.settings.case_insensitive_completion = config.get(

'caseInsensitiveCompletion', True)

for path in config.get('extraPaths', []):

if path and path not in sys.path:

sys.path.insert(0, path)

def _process_request(self, request):

"""Accept serialized request from VSCode and write response.

"""

request = self._deserialize(request)

self._set_request_config(request.get('config', {}))

path = self._get_top_level_module(request.get('path', ''))

if path not in sys.path:

sys.path.insert(0, path)

lookup = request.get('lookup', 'completions')

if lookup == 'names':

return self._write_response(self._serialize_definitions(

jedi.api.names(

source=request['source'],

path=request.get('path', ''),

all_scopes=True),

request['id']))

script = jedi.api.Script(

source=request['source'], line=request['line'] + 1,

column=request['column'], path=request.get('path', ''))

if lookup == 'definitions':

return self._write_response(self._serialize_definitions(

script.goto_assignments(), request['id']))

elif lookup == 'arguments':

return self._write_response(self._serialize_arguments(

script, request['id']))

elif lookup == 'usages':

return self._write_response(self._serialize_usages(

script.usages(), request['id']))

else:

return self._write_response(

self._serialize_completions(script, request['id'],

request.get('prefix', '')))

def _write_response(self, response):

sys.stdout.write(response + '\n')

sys.stdout.flush()

def watch(self):

while True:

try:

self._process_request(self._input.readline())

except Exception:

sys.stderr.write(traceback.format_exc() + '\n')

sys.stderr.flush()

if __name__ == '__main__':

JediCompletion().watch()