CodeIntel/codeintel/codeintel2/tree_python.py at master · odidev/CodeIntel

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#!/usr/bin/env python

# ***** BEGIN LICENSE BLOCK *****

# Version: MPL 1.1/GPL 2.0/LGPL 2.1

# The contents of this file are subject to the Mozilla Public License

# Version 1.1 (the "License"); you may not use this file except in

# compliance with the License. You may obtain a copy of the License at

# http://www.mozilla.org/MPL/

# Software distributed under the License is distributed on an "AS IS"

# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the

# License for the specific language governing rights and limitations

# under the License.

# The Original Code is Komodo code.

# The Initial Developer of the Original Code is ActiveState Software Inc.

# Contributor(s):

# ActiveState Software Inc

# Alternatively, the contents of this file may be used under the terms of

# either the GNU General Public License Version 2 or later (the "GPL"), or

# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

# in which case the provisions of the GPL or the LGPL are applicable instead

# of those above. If you wish to allow use of your version of this file only

# under the terms of either the GPL or the LGPL, and not to allow others to

# use your version of this file under the terms of the MPL, indicate your

# decision by deleting the provisions above and replace them with the notice

# and other provisions required by the GPL or the LGPL. If you do not delete

# the provisions above, a recipient may use your version of this file under

# the terms of any one of the MPL, the GPL or the LGPL.

# ***** END LICENSE BLOCK *****

"""Completion evaluation code for Python"""

from __future__ import absolute_import

from os.path import basename, dirname, join, exists, isdir

import operator

from codeintel2.common import *

from codeintel2.tree import TreeEvaluator

base_exception_class_completions = [

("class", "BaseException"),

("class", "Exception"),

("class", "StandardError"),

("class", "ArithmeticError"),

("class", "LookupError"),

("class", "EnvironmentError"),

("class", "AssertionError"),

("class", "AttributeError"),

("class", "EOFError"),

("class", "FloatingPointError"),

("class", "GeneratorExit"),

("class", "IOError"),

("class", "ImportError"),

("class", "IndexError"),

("class", "KeyError"),

("class", "KeyboardInterrupt"),

("class", "MemoryError"),

("class", "NameError"),

("class", "NotImplementedError"),

("class", "OSError"),

("class", "OverflowError"),

("class", "ReferenceError"),

("class", "RuntimeError"),

("class", "StopIteration"),

("class", "SyntaxError"),

("class", "SystemError"),

("class", "SystemExit"),

("class", "TypeError"),

("class", "UnboundLocalError"),

("class", "UnicodeError"),

("class", "UnicodeEncodeError"),

("class", "UnicodeDecodeError"),

("class", "UnicodeTranslateError"),

("class", "ValueError"),

("class", "VMSError"),

("class", "WindowsError"),

("class", "ZeroDivisionError"),

# Warning category exceptions.

("class", "Warning"),

("class", "UserWarning"),

("class", "DeprecationWarning"),

("class", "PendingDeprecationWarning"),

("class", "SyntaxWarning"),

("class", "RuntimeWarning"),

("class", "FutureWarning"),

("class", "ImportWarning"),

("class", "UnicodeWarning"),

]

class ClassInstance():

def __init__(self, elem):

self.elem = elem

@property

def tag(self):

return self.elem.tag

@property

def names(self):

return self.elem.names

def get(self, name, default=None):

if name == "ilk":

return "instance"

return self.elem.get(name, default)

def __iter__(self):

return iter(self.elem)

def __repr__(self):

return "<instance" + repr(self.elem)[6:]

class PythonImportLibGenerator(object):

"""A lazily loading lib generator.

To be used for Komodo's import lookup handling. This generator will return

libraries as needed, then when the given set of libraries runs out (i.e.

when there were no matches in the given libraries), to then try and find

other possible directories (libraries) that could offer a match."""

def __init__(self, mgr, lang, bufpath, imp_prefix, libs):

self.mgr = mgr

self.lang = lang

self.imp_prefix = imp_prefix

self.bufpath = bufpath

self.libs = libs

self.index = 0

def __iter__(self):

self.index = 0

return self

def __next__(self):

if self.index < len(self.libs):

# Return the regular libs.

try:

return self.libs[self.index]

finally:

self.index += 1

elif self.index == len(self.libs):

# Try to find a matching parent directory to use.

#print "Lazily loading the parent import libs: %r" % (self.imp_prefix, )

self.index += 1

lookuppath = dirname(self.bufpath)

parent_dirs_left = 5

import_name = self.imp_prefix[0]

if "." in import_name:

import_name = import_name.split(".", 1)[0]

while lookuppath and parent_dirs_left > 0:

#print ' exists: %r - %r' % (exists(join(lookuppath, import_name, "__init__.py")), join(lookuppath, import_name, "__init__.py"))

parent_dirs_left -= 1

if exists(join(lookuppath, import_name, "__init__.py")):

# Matching directory - return that as a library.

#print " adding parent dir lib: %r" % (lookuppath)

return self.mgr.db.get_lang_lib(self.lang, "parentdirlib",

[lookuppath])

lookuppath = dirname(lookuppath)

# No match found - we're done.

raise StopIteration

else:

raise StopIteration

next = __next__

class PythonTreeEvaluator(TreeEvaluator):

# Own copy of libs (that shadows the real self.buf.libs) - this is required

# in order to properly adjust the "reldirlib" libraries as they hit imports

# from different directories - i.e. to correctly deal with relative imports.

_libs = None

@property

def libs(self):

if self._libs is None:

self._libs = self.buf.libs

return self._libs

@libs.setter

def libs(self, value):

self._libs = value

def eval_cplns(self):

self.log_start()

if self.trg.type == 'available-exceptions':

# TODO: Should perform a lookup to determine all available exception

# classes.

return base_exception_class_completions

start_scoperef = self.get_start_scoperef()

self.info("start scope is %r", start_scoperef)

if self.trg.type == 'local-symbols':

return self._available_symbols(start_scoperef, self.expr)

#if self.trg.type == 'available-classes':

# return self._available_classes(start_scoperef, self.trg.extra["consumed"])

hit = self._hit_from_citdl(self.expr, start_scoperef)

return list(self._members_from_hit(hit))

def eval_calltips(self):

self.log_start()

start_scoperef = self.get_start_scoperef()

self.info("start scope is %r", start_scoperef)

hit = self._hit_from_citdl(self.expr, start_scoperef)

return [ self._calltip_from_hit(hit) ]

def eval_defns(self):

self.log_start()

start_scoperef = self.get_start_scoperef()

self.info("start scope is %r", start_scoperef)

hit = self._hit_from_citdl(self.expr, start_scoperef, defn_only=True)

return [ self._defn_from_hit(hit) ]

def _defn_from_hit(self, hit):

defn = TreeEvaluator._defn_from_hit(self, hit)

if not defn.path:

# Locate the module in the users own Python stdlib,

# bug 65296.

langintel = self.buf.langintel

info = langintel.python_info_from_env(self.buf.env)

ver, prefix, libdir, sitelibdir, sys_path = info

if libdir:

elem, (blob, lpath) = hit

path = join(libdir, blob.get("name"))

if exists(path + ".py"):

defn.path = path + ".py"

elif isdir(path) and exists(join(path, "__init__.py")):

defn.path = join(path, "__init__.py")

return defn

#def _available_classes(self, scoperef, consumed):

# matches = set()

# blob = scoperef[0] # XXX??

# for elem in blob:

# if elem.tag == 'scope' and elem.get('ilk') == 'class':

# matches.add(elem.get('name'))

# matches.difference_update(set(consumed))

# matches_list = sorted(list(matches))

# return [('class', m) for m in matches_list]

def _available_symbols(self, scoperef, expr):

cplns = []

found_names = set()

while scoperef:

elem = self._elem_from_scoperef(scoperef)

if not elem:

break

for child in elem:

if child.tag == "import":

name = child.get("alias") or child.get("symbol") or child.get("module")

# TODO: Deal with "*" imports.

else:

name = child.get("name", "")

if name.startswith(expr):

if name not in found_names:

found_names.add(name)

ilk = child.get("ilk") or child.tag

if ilk == "import":

ilk = "module"

cplns.append((ilk, name))

scoperef = self.parent_scoperef_from_scoperef(scoperef)

# Add keywords, being smart about where they are allowed.

preceeding_text = self.trg.extra.get("preceeding_text", "")

for keyword in self.buf.langintel.keywords:

# Don't remove short keywords, as that has a conflict with fill-up

# characters, see bug 100471.

#if len(keyword) < 3 or not keyword.startswith(expr):

if not keyword.startswith(expr):

continue

# Always add None and lambda, otherwise only at the start of lines.

if not preceeding_text or keyword in ("None", "lambda"):

cplns.append(("keyword", keyword))

return sorted(cplns, key=operator.itemgetter(1))

def _tokenize_citdl_expr(self, citdl):

for token in citdl.split('.'):

if token.endswith('()'):

yield token[:-2]

yield '()'

else:

yield token

def _join_citdl_expr(self, tokens):

return '.'.join(tokens)

def _calltip_from_func(self, elem, scoperef, class_name=None):

# See "Determining a Function CallTip" in the spec for a

# discussion of this algorithm.

signature = elem.get("signature")

ctlines = []

if not signature:

name = class_name or elem.get("name")

ctlines = [name + "(...)"]

else:

ctlines = signature.splitlines(0)

doc = elem.get("doc")

if doc:

ctlines += doc.splitlines(0)

return '\n'.join(ctlines)

def _calltip_from_class(self, elem, scoperef):

# If the class has a defined signature then use that.

signature = elem.get("signature")

if signature:

doc = elem.get("doc")

ctlines = signature.splitlines(0)

if doc:

ctlines += doc.splitlines(0)

return '\n'.join(ctlines)

else:

ctor_hit = self._ctor_hit_from_class(elem, scoperef)

if ctor_hit and (ctor_hit[0].get("doc")

or ctor_hit[0].get("signature")):

self.log("ctor is %r on %r", *ctor_hit)

return self._calltip_from_func(ctor_hit[0], ctor_hit[1],

class_name=elem.get("name"))

else:

doc = elem.get("doc")

if doc:

ctlines = [ln for ln in doc.splitlines(0) if ln]

else:

ctlines = [elem.get("name") + "()"]

return '\n'.join(ctlines)

def _ctor_hit_from_class(self, elem, scoperef):

"""Return the Python ctor for the given class element, or None."""

if "__init__" in elem.names:

class_scoperef = (scoperef[0], scoperef[1]+[elem.get("name")])

return elem.names["__init__"], class_scoperef

else:

for classref in elem.get("classrefs", "").split():

try:

basehit = self._hit_from_type_inference(classref, scoperef)

except CodeIntelError as ex:

self.warn(str(ex))

else:

ctor_hit = self._ctor_hit_from_class(*basehit)

if ctor_hit:

return ctor_hit

return None

def _calltip_from_hit(self, hit):

# TODO: compare with CitadelEvaluator._getSymbolCallTips()

elem, scoperef = hit

if elem.tag == "variable":

XXX

elif elem.tag == "scope":

ilk = elem.get("ilk")

if ilk == "function":

calltip = self._calltip_from_func(elem, scoperef)

elif ilk in ("class", "instance"):

calltip = self._calltip_from_class(elem, scoperef)

else:

raise NotImplementedError("unexpected scope ilk for "

"calltip hit: %r" % elem)

else:

raise NotImplementedError("unexpected elem for calltip "

"hit: %r" % elem)

return calltip

def _members_from_elem(self, elem):

"""Return the appropriate set of autocomplete completions for

the given element. Typically this is just one, but can be more for

'*'-imports

"""

members = set()

if elem.tag == "import":

alias = elem.get("alias")

symbol_name = elem.get("symbol")

module_name = elem.get("module")

if symbol_name:

import_handler = self.citadel.import_handler_from_lang(self.trg.lang)

blob = import_handler.import_blob_name(

module_name, self.libs, self.ctlr)

if symbol_name == "*":

for m_name, m_elem in blob.names.items():

m_type = m_elem.get("ilk") or m_elem.tag

members.add( (m_type, m_name) )

elif symbol_name in blob.names:

symbol = blob.names[symbol_name]

member_type = (symbol.get("ilk") or symbol.tag)

members.add( (member_type, alias or symbol_name) )

else:

hit, nconsumed \

= self._hit_from_elem_imports([symbol_name], blob)

if hit:

symbol = hit[0]

member_type = (symbol.get("ilk") or symbol.tag)

members.add( (member_type, alias or symbol_name) )

else:

self.warn("could not resolve %r", elem)

else:

cpln_name = alias or module_name.split('.', 1)[0]

members.add( ("module", cpln_name) )

else:

members.add( (elem.get("ilk") or elem.tag, elem.get("name")) )

return members

def _members_from_hit(self, hit, hidden=None):

elem, scoperef = hit

ilk = elem.get("ilk")

if ilk == "class":

if hidden is None:

hidden = ["__hidden__", "__instancevar__"]

elif ilk == "instance":

if hidden is None:

hidden = ["__hidden__"]

else:

if hidden is None:

hidden = ["__hidden__"]

members = set()

for child in elem:

attributes = child.get("attributes", "").split()

for attr in hidden:

if attr in attributes:

break

else:

try:

members.update(self._members_from_elem(child))

except CodeIntelError as ex:

self.warn("%s (skipping members for %s)", ex, child)

if ilk in ("class", "instance"):

for classref in elem.get("classrefs", "").split():

try:

subhit = self._hit_from_type_inference(classref, scoperef)

except CodeIntelError as ex:

# Continue with what we *can* resolve.

self.warn(str(ex))

else:

members.update(self._members_from_hit(subhit, hidden=hidden))

# Add special __class__ attribute.

members.add(("variable", "__class__"))

# Add special __doc__ attribute.

members.add(("variable", "__doc__"))

return members

def _hit_from_citdl(self, expr, scoperef, defn_only=False):

"""Resolve the given CITDL expression (starting at the given

scope) down to a non-import/non-variable hit.

"""

self._check_infinite_recursion(expr)

tokens = list(self._tokenize_citdl_expr(expr))

#self.log("expr tokens: %r", tokens)

# First part...

hit, nconsumed = self._hit_from_first_part(tokens, scoperef)

if not hit:

#TODO: Add the fallback Buffer-specific near-by hunt

# for a symbol for the first token. See my spiral-bound

# book for some notes.

raise CodeIntelError("could not resolve first part of '%s'" % expr)

self.debug("_hit_from_citdl: first part: %r -> %r",

tokens[:nconsumed], hit)

# ...the remainder.

remaining_tokens = tokens[nconsumed:]

while remaining_tokens:

self.debug("_hit_from_citdl: resolve %r on %r in %r",

remaining_tokens, *hit)

if remaining_tokens[0] == "()":

new_hit = self._hit_from_call(*hit)

nconsumed = 1

else:

new_hit, nconsumed \

= self._hit_from_getattr(remaining_tokens, *hit)

remaining_tokens = remaining_tokens[nconsumed:]

hit = new_hit

# Resolve any variable type inferences.

#TODO: Need to *recursively* resolve hits.

elem, scoperef = hit

if elem.tag == "variable" and not defn_only:

elem, scoperef = self._hit_from_variable_type_inference(elem, scoperef)

self.info("'%s' is %s on %s", expr, elem, scoperef)

return (elem, scoperef)

def _hit_from_first_part(self, tokens, scoperef):

"""Find a hit for the first part of the tokens.

Returns (<hit>, <num-tokens-consumed>) or (None, None) if could

not resolve.

Example for 'os.sep':

tokens: ('os', 'sep')

retval: ((<variable 'sep'>, (<blob 'os', [])), 1)

Example for 'os.path':

tokens: ('os', 'path')

retval: ((<import os.path>, (<blob 'os', [])), 2)

"""

first_token = tokens[0]

self.log("find '%s ...' starting at %s:", first_token, scoperef)

# pythoncile will sometimes give a citdl expression of "__builtins__",

# check for this now, bug:

# http://bugs.activestate.com/show_bug.cgi?id=71972

if first_token == "__builtins__":

# __builtins__ is the same as the built_in_blob, return it.

scoperef = (self.built_in_blob, [])

return (self.built_in_blob, scoperef), 1

while 1:

elem = self._elem_from_scoperef(scoperef)

if first_token in elem.names:

#TODO: skip __hidden__ names

self.log("is '%s' accessible on %s? yes: %s",

first_token, scoperef, elem.names[first_token])

return (elem.names[first_token], scoperef), 1

hit, nconsumed \

= self._hit_from_elem_imports(tokens, elem)

if hit is not None:

self.log("is '%s' accessible on %s? yes: %s",

'.'.join(tokens[:nconsumed]), scoperef, hit[0])

return hit, nconsumed

if first_token == elem.get("name"):

# The element itself is the thing we wanted...

self.log("is '%s' accessible on %s? yes: %s",

first_token, scoperef, elem)

return (elem, scoperef), 1

self.log("is '%s' accessible on %s? no", first_token, scoperef)

scoperef = self.parent_scoperef_from_scoperef(scoperef)

if not scoperef:

return None, None

def _set_reldirlib_from_blob(self, blob):

"""Set the relative import directory to be this blob's location."""

# See bug 45822 and bug 88971 for examples of why this is necessary.

if blob is None:

return

blob_src = blob.get("src")

if blob_src and blob.get("ilk") == "blob":

reldirpath = dirname(blob_src)

reldirlib = self.mgr.db.get_lang_lib(self.trg.lang, "reldirlib",

[reldirpath])

newlibs = self.libs[:] # Make a copy of the libs.

if newlibs[0].name == "reldirlib":

# Update the existing reldirlib location.

newlibs[0] = reldirlib

else:

# Add in the relative directory lib.

newlibs.insert(0, reldirlib)

self.log("imports:: setting reldirlib to: %r", reldirpath)

self.libs = newlibs

def _add_parentdirlib(self, libs, tokens):

"""Add a lazily loaded parent directory import library."""

if isinstance(libs, PythonImportLibGenerator):

# Reset to the original libs.

libs = libs.libs

libs = PythonImportLibGenerator(self.mgr, self.trg.lang, self.buf.path,

tokens, libs)

return libs

def __hit_from_elem_imports(self, tokens, elem):

"""See if token is from one of the imports on this <scope> elem.

Returns (<hit>, <num-tokens-consumed>) or (None, None) if not found.

XXX import_handler.import_blob_name() calls all have potential

to raise CodeIntelError.

"""

#PERF: just have a .import_handler property on the evalr?

import_handler = self.citadel.import_handler_from_lang(self.trg.lang)

#PERF: Add .imports method to ciElementTree for quick iteration

# over them. Or perhaps some cache to speed this method.

#TODO: The right answer here is to not resolve the <import>,

# just return it. It is complicated enough that the

# construction of members has to know the original context.

# See the "Foo.mypackage.<|>mymodule.yo" part of test

# python/cpln/wacky_imports.

# XXX Not totally confident that this is the right answer.

first_token = tokens[0]

possible_submodule_tokens = []

self._check_infinite_recursion(first_token)

orig_libs = self.libs

for imp_elem in (i for i in elem if i.tag == "import"):

libs = orig_libs # reset libs back to the original

self.debug("'%s ...' from %r?", tokens[0], imp_elem)

alias = imp_elem.get("alias")

symbol_name = imp_elem.get("symbol")

module_name = imp_elem.get("module")

allow_parentdirlib = True

if module_name.startswith("."):

allow_parentdirlib = False

# Need a different curdirlib.

if libs[0].name == "reldirlib":

lookuppath = libs[0].dirs[0]

module_name = module_name[1:]

else:

lookuppath = self.buf.path

while module_name.startswith("."):

lookuppath = dirname(lookuppath)

module_name = module_name[1:]

libs = [self.mgr.db.get_lang_lib(self.trg.lang, "curdirlib",

[lookuppath])]

if not module_name:

module_name = symbol_name

symbol_name = None

if symbol_name:

# from module import symbol, from module import symbol as alias

# from module import submod, from module import submod as alias

if (alias and alias == first_token) \

or (not alias and symbol_name == first_token):

# Try 'from module import symbol/from module import

# symbol as alias' first.

if allow_parentdirlib:

libs = self._add_parentdirlib(libs, module_name.split("."))

try:

blob = import_handler.import_blob_name(

module_name, libs, self.ctlr)

if symbol_name in blob.names:

return (blob.names[symbol_name], (blob, [])), 1

else:

self._set_reldirlib_from_blob(blob)

hit, nconsumed = self._hit_from_elem_imports(

[first_token] + tokens[1:], blob)

if hit:

return hit, nconsumed

except CodeIntelError:

pass

# That didn't work, try 'from module import

# submod/from module import submod as alias'.

submodule_name = import_handler.sep.join(

[module_name, symbol_name])

if allow_parentdirlib:

libs = self._add_parentdirlib(libs, submodule_name.split("."))

try:

subblob = import_handler.import_blob_name(

submodule_name, libs, self.ctlr)

return (subblob, (subblob, [])), 1

except CodeIntelError:

# That didn't work either. Give up.

self.warn("could not import '%s' from %s",

first_token, imp_elem)

# from module import *

elif symbol_name == "*":

try:

if allow_parentdirlib:

libs = self._add_parentdirlib(libs, module_name.split("."))

blob = import_handler.import_blob_name(

module_name, libs, self.ctlr)

except CodeIntelError:

pass # don't freak out: might not be our import anyway

else:

self._set_reldirlib_from_blob(blob)

try:

hit, nconsumed = self._hit_from_getattr(

tokens, blob, (blob, []))

except CodeIntelError:

pass

else:

if hit:

return hit, nconsumed

elif (alias and alias == first_token) \

or ((not alias or self.trg.form == TRG_FORM_DEFN) and module_name == first_token):

if allow_parentdirlib:

libs = self._add_parentdirlib(libs, module_name.split("."))

blob = import_handler.import_blob_name(

module_name, libs, self.ctlr)

return (blob, (blob, [])), 1

elif '.' in module_name:

# E.g., might be looking up ('os', 'path', ...) and

# have <import os.path>.

module_tokens = module_name.split('.')

if allow_parentdirlib:

libs = self._add_parentdirlib(libs, module_tokens)

if module_tokens == tokens[:len(module_tokens)]:

# E.g. tokens: ('os', 'path', ...)

# imp_elem: <import os.path>

# return: <blob 'os.path'> for first two tokens

blob = import_handler.import_blob_name(

module_name, libs, self.ctlr)

#XXX Is this correct scoperef for module object?

return (blob, (blob, [])), len(module_tokens)

elif module_tokens[0] == tokens[0]:

# To check later if there are no exact import matches.

possible_submodule_tokens.append(module_tokens)

# No matches, check if there is a partial import match.

if possible_submodule_tokens:

libs = orig_libs # reset libs back to the original

if allow_parentdirlib:

libs = self._add_parentdirlib(libs, module_tokens)

# E.g. tokens: ('os', 'sep', ...)

# imp_elem: <import os.path>

# return: <blob 'os'> for first token

for i in range(len(module_tokens)-1, 0, -1):

for module_tokens in possible_submodule_tokens:

if module_tokens[:i] == tokens[:i]:

blob = import_handler.import_blob_name(

'.'.join(module_tokens[:i]),

libs, self.ctlr)

#XXX Is this correct scoperef for module object?

return (blob, (blob, [])), i

return None, None

def _hit_from_elem_imports(self, tokens, elem):

"""See if token is from one of the imports on this <scope> elem.

Returns (<hit>, <num-tokens-consumed>) or (None, None) if not found.

XXX import_handler.import_blob_name() calls all have potential

to raise CodeIntelError.

"""

# This is a wrapper function around the real __hit_from_elem_imports,

# that will update the relative dir libs appropriately when an import

# hit is made - see bug 88971 for why this is necessary.

hit, nconsumed = self.__hit_from_elem_imports(tokens, elem)

if hit is not None:

self._set_reldirlib_from_blob(hit[0])

return hit, nconsumed

def _hit_from_call(self, elem, scoperef):

"""Resolve the function call inference for 'elem' at 'scoperef'."""

# This might be a variable, in that case we keep resolving the variable

# until we get to the final function/class element that is to be called.

while elem.tag == "variable":

elem, scoperef = self._hit_from_variable_type_inference(elem, scoperef)

ilk = elem.get("ilk")

if ilk == "class":

# Return the class element.

self.log("_hit_from_call: resolved to class instance '%s'", elem.get("name"))

return (ClassInstance(elem), scoperef)

if ilk == "function":

citdl = elem.get("returns")

if citdl:

self.log("_hit_from_call: function with citdl %r",

citdl)

# scoperef has to be set to the function called

func_scoperef = (scoperef[0], scoperef[1]+[elem.get("name")])

return self._hit_from_citdl(citdl, func_scoperef)

raise CodeIntelError("no return type info for %r" % elem)

def _hit_from_getattr(self, tokens, elem, scoperef):

"""Return a hit for a getattr on the given element.

Returns (<hit>, <num-tokens-consumed>) or raises an CodeIntelError.

Typically this just does a getattr of tokens[0], but handling

some multi-level imports can result in multiple tokens being

consumed.

"""

#TODO: On failure, call a hook to make an educated guess. Some

# attribute names are strong signals as to the object type

# -- typically those for common built-in classes.

first_token = tokens[0]

self.log("resolve getattr '%s' on %r in %r:", first_token,

elem, scoperef)

if elem.tag == "variable":

elem, scoperef = self._hit_from_variable_type_inference(elem, scoperef)

assert elem.tag == "scope"

ilk = elem.get("ilk")

if ilk == "function":

attr = elem.names.get(first_token)

if attr is not None:

ilk = elem.get("ilk")

if ilk in ("class", "instance", "function"):

return (attr, scoperef), 1

# Internal function arguments and variable should

# *not* resolve. And we don't support function

# attributes.

elif ilk in ("class", "instance"):

attr = elem.names.get(first_token)

if attr is not None:

self.log("attr is %r in %r", attr, elem)

# update the scoperef, we are now inside the class.

scoperef = (scoperef[0], scoperef[1] + [elem.get("name")])

return (attr, scoperef), 1

# When looking for a __class__ on a class instance, we match the

# class itself - bug .

if first_token == "__class__":

self.log("attr is class %r", elem)

return (elem, scoperef), 1

self.debug("look for %r from imports in %r", tokens, elem)

hit, nconsumed \

= self._hit_from_elem_imports(tokens, elem)

if hit is not None:

return hit, nconsumed

for classref in elem.get("classrefs", "").split():

try:

self.log("is '%s' from base class: %r?", first_token,

classref)

base_elem, base_scoperef \

= self._hit_from_type_inference(classref, scoperef)

return self._hit_from_getattr(tokens, base_elem,

base_scoperef)

except CodeIntelError as ex:

self.log("could not resolve classref '%s' on scoperef %r",

classref, scoperef, )

# Was not available, try the next class then.

elif ilk == "blob":

attr = elem.names.get(first_token)

if attr is not None:

self.log("attr is %r in %r", attr, elem)

return (attr, scoperef), 1

hit, nconsumed \

= self._hit_from_elem_imports(tokens, elem)

if hit is not None:

return hit, nconsumed

else:

raise NotImplementedError("unexpected scope ilk: %r" % ilk)

raise CodeIntelError("could not resolve '%s' getattr on %r in %r"

% (first_token, elem, scoperef))

def _hit_from_variable_type_inference(self, elem, scoperef):

"""Resolve the type inference for 'elem' at 'scoperef'."""

citdl = elem.get("citdl")

if not citdl:

raise CodeIntelError("no type-inference info for %r" % elem)

self.log("resolve '%s' type inference for %r:", citdl, elem)

return self._hit_from_citdl(citdl, scoperef)

def _hit_from_type_inference(self, citdl, scoperef):

"""Resolve the 'citdl' type inference at 'scoperef'."""

self.log("resolve '%s' type inference:", citdl)

return self._hit_from_citdl(citdl, scoperef)

@property

def stdlib(self):

#XXX Presume last lib is stdlib.

return self.buf.libs[-1]

_built_in_blob = None

@property

def built_in_blob(self):

if self._built_in_blob is None:

self._built_in_blob = self.stdlib.get_blob("*")

return self._built_in_blob

def parent_scoperef_from_scoperef(self, scoperef):

blob, lpath = scoperef

if lpath:

parent_lpath = lpath[:-1]

if parent_lpath:

elem = self._elem_from_scoperef((blob, parent_lpath))

if elem.get("ilk") in ("class", "instance"):

# Python eval shouldn't consider the class-level

# scope as a parent scope when resolving from the

# top-level. (test python/cpln/skip_class_scope)

parent_lpath = parent_lpath[:-1]

return (blob, parent_lpath)

elif blob is self._built_in_blob:

return None

else:

return (self.built_in_blob, [])

def _elem_from_scoperef(self, scoperef):

"""A scoperef is (<blob>, <lpath>). Return the actual elem in

the <blob> ciElementTree being referred to.

"""

elem = scoperef[0]

for lname in scoperef[1]:

elem = elem.names[lname]

return elem

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