154 lines
5.6 KiB
Python
154 lines
5.6 KiB
Python
"""
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One of the really important features of |jedi| is to have an option to
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understand code like this::
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def foo(bar):
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bar. # completion here
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foo(1)
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There's no doubt wheter bar is an ``int`` or not, but if there's also a call
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like ``foo('str')``, what would happen? Well, we'll just show both. Because
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that's what a human would expect.
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It works as follows:
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- |Jedi| sees a param
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- search for function calls named ``foo``
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- execute these calls and check the input. This work with a ``ParamListener``.
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"""
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from jedi._compatibility import unicode
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from jedi.parser import representation as pr
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from jedi import settings
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from jedi.evaluate import helpers
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from jedi.evaluate.cache import memoize_default
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from jedi.evaluate import imports
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# This is something like the sys.path, but only for searching params. It means
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# that this is the order in which Jedi searches params.
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search_param_modules = ['.']
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class ParamListener(object):
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"""
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This listener is used to get the params for a function.
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"""
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def __init__(self):
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self.param_possibilities = []
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def execute(self, params):
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self.param_possibilities.append(params)
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@memoize_default([], evaluator_is_first_arg=True)
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def search_params(evaluator, param):
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"""
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This is a dynamic search for params. If you try to complete a type:
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>>> def func(foo):
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... foo
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>>> func(1)
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>>> func("")
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It is not known what the type is, because it cannot be guessed with
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recursive madness. Therefore one has to analyse the statements that are
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calling the function, as well as analyzing the incoming params.
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"""
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if not settings.dynamic_params:
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return []
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def get_params_for_module(module):
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"""
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Returns the values of a param, or an empty array.
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"""
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@memoize_default([], evaluator_is_first_arg=True)
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def get_posibilities(evaluator, module, func_name):
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try:
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possible_stmts = module.used_names[func_name]
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except KeyError:
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return []
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for stmt in possible_stmts:
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if isinstance(stmt, pr.Import):
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continue
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calls = helpers.scan_statement_for_calls(stmt, func_name)
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for c in calls:
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# no execution means that params cannot be set
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call_path = list(c.generate_call_path())
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pos = c.start_pos
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scope = stmt.parent
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# this whole stuff is just to not execute certain parts
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# (speed improvement), basically we could just call
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# ``eval_call_path`` on the call_path and it would
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# also work.
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def listRightIndex(lst, value):
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return len(lst) - lst[-1::-1].index(value) - 1
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# Need to take right index, because there could be a
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# func usage before.
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call_path_simple = [unicode(d) if isinstance(d, pr.NamePart)
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else d for d in call_path]
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i = listRightIndex(call_path_simple, func_name)
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first, last = call_path[:i], call_path[i + 1:]
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if not last and not call_path_simple.index(func_name) != i:
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continue
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scopes = [scope]
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if first:
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scopes = evaluator.eval_call_path(iter(first), c.parent, pos)
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pos = None
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from jedi.evaluate import representation as er
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for scope in scopes:
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s = evaluator.find_types(scope, func_name, position=pos,
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search_global=not first,
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resolve_decorator=False)
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c = [getattr(escope, 'base_func', None) or escope.base
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for escope in s
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if escope.isinstance(er.Function, er.Class)]
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if compare in c:
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# only if we have the correct function we execute
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# it, otherwise just ignore it.
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evaluator.follow_path(iter(last), s, scope)
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return listener.param_possibilities
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result = []
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for params in get_posibilities(evaluator, module, func_name):
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for p in params:
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if str(p) == param_name:
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result += evaluator.eval_statement(p.parent)
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return result
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func = param.get_parent_until(pr.Function)
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current_module = param.get_parent_until()
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func_name = unicode(func.name)
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compare = func
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if func_name == '__init__' and isinstance(func.parent, pr.Class):
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func_name = unicode(func.parent.name)
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compare = func.parent
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# get the param name
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if param.assignment_details:
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# first assignment details, others would be a syntax error
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expression_list, op = param.assignment_details[0]
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else:
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expression_list = param.expression_list()
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offset = 1 if expression_list[0] in ['*', '**'] else 0
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param_name = str(expression_list[offset].name)
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# add the listener
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listener = ParamListener()
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func.listeners.add(listener)
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result = []
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# This is like backtracking: Get the first possible result.
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for mod in imports.get_modules_containing_name([current_module], func_name):
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result = get_params_for_module(mod)
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if result:
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break
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# cleanup: remove the listener; important: should not stick.
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func.listeners.remove(listener)
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return result
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