forked from VimPlug/jedi
731 lines
29 KiB
Python
731 lines
29 KiB
Python
"""
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Functions inferring the syntax tree.
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"""
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import copy
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from parso.python import tree
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from jedi._compatibility import force_unicode, unicode
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from jedi import debug
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from jedi import parser_utils
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from jedi.inference.base_context import ContextSet, NO_CONTEXTS, ContextualizedNode, \
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ContextualizedName, iterator_to_context_set, iterate_contexts
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from jedi.inference.lazy_context import LazyTreeContext
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from jedi.inference import compiled
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from jedi.inference import recursion
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from jedi.inference import helpers
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from jedi.inference import analysis
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from jedi.inference import imports
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from jedi.inference import arguments
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from jedi.inference.context import ClassContext, FunctionContext
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from jedi.inference.context import iterable
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from jedi.inference.context import TreeInstance
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from jedi.inference.finder import NameFinder
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from jedi.inference.helpers import is_string, is_literal, is_number
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from jedi.inference.compiled.access import COMPARISON_OPERATORS
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from jedi.inference.cache import evaluator_method_cache
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from jedi.inference.gradual.stub_context import VersionInfo
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from jedi.inference.gradual import annotation
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from jedi.inference.context.decorator import Decoratee
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from jedi.plugins import plugin_manager
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def _limit_context_infers(func):
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"""
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This is for now the way how we limit type inference going wild. There are
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other ways to ensure recursion limits as well. This is mostly necessary
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because of instance (self) access that can be quite tricky to limit.
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I'm still not sure this is the way to go, but it looks okay for now and we
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can still go anther way in the future. Tests are there. ~ dave
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"""
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def wrapper(context, *args, **kwargs):
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n = context.tree_node
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evaluator = context.evaluator
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try:
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evaluator.inferred_element_counts[n] += 1
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if evaluator.inferred_element_counts[n] > 300:
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debug.warning('In context %s there were too many inferences.', n)
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return NO_CONTEXTS
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except KeyError:
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evaluator.inferred_element_counts[n] = 1
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return func(context, *args, **kwargs)
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return wrapper
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def _py__stop_iteration_returns(generators):
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results = NO_CONTEXTS
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for generator in generators:
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try:
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method = generator.py__stop_iteration_returns
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except AttributeError:
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debug.warning('%s is not actually a generator', generator)
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else:
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results |= method()
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return results
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@debug.increase_indent
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@_limit_context_infers
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def eval_node(context, element):
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debug.dbg('eval_node %s@%s in %s', element, element.start_pos, context)
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evaluator = context.evaluator
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typ = element.type
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if typ in ('name', 'number', 'string', 'atom', 'strings', 'keyword', 'fstring'):
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return eval_atom(context, element)
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elif typ == 'lambdef':
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return ContextSet([FunctionContext.from_context(context, element)])
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elif typ == 'expr_stmt':
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return eval_expr_stmt(context, element)
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elif typ in ('power', 'atom_expr'):
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first_child = element.children[0]
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children = element.children[1:]
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had_await = False
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if first_child.type == 'keyword' and first_child.value == 'await':
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had_await = True
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first_child = children.pop(0)
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context_set = context.eval_node(first_child)
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for (i, trailer) in enumerate(children):
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if trailer == '**': # has a power operation.
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right = context.eval_node(children[i + 1])
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context_set = _eval_comparison(
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evaluator,
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context,
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context_set,
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trailer,
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right
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)
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break
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context_set = eval_trailer(context, context_set, trailer)
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if had_await:
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return context_set.py__await__().py__stop_iteration_returns()
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return context_set
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elif typ in ('testlist_star_expr', 'testlist',):
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# The implicit tuple in statements.
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return ContextSet([iterable.SequenceLiteralContext(evaluator, context, element)])
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elif typ in ('not_test', 'factor'):
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context_set = context.eval_node(element.children[-1])
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for operator in element.children[:-1]:
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context_set = eval_factor(context_set, operator)
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return context_set
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elif typ == 'test':
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# `x if foo else y` case.
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return (context.eval_node(element.children[0]) |
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context.eval_node(element.children[-1]))
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elif typ == 'operator':
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# Must be an ellipsis, other operators are not inferred.
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# In Python 2 ellipsis is coded as three single dot tokens, not
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# as one token 3 dot token.
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if element.value not in ('.', '...'):
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origin = element.parent
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raise AssertionError("unhandled operator %s in %s " % (repr(element.value), origin))
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return ContextSet([compiled.builtin_from_name(evaluator, u'Ellipsis')])
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elif typ == 'dotted_name':
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context_set = eval_atom(context, element.children[0])
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for next_name in element.children[2::2]:
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# TODO add search_global=True?
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context_set = context_set.py__getattribute__(next_name, name_context=context)
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return context_set
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elif typ == 'eval_input':
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return eval_node(context, element.children[0])
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elif typ == 'annassign':
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return annotation.eval_annotation(context, element.children[1]) \
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.execute_annotation()
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elif typ == 'yield_expr':
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if len(element.children) and element.children[1].type == 'yield_arg':
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# Implies that it's a yield from.
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element = element.children[1].children[1]
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generators = context.eval_node(element) \
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.py__getattribute__('__iter__').execute_with_values()
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return generators.py__stop_iteration_returns()
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# Generator.send() is not implemented.
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return NO_CONTEXTS
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elif typ == 'namedexpr_test':
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return eval_node(context, element.children[2])
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else:
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return eval_or_test(context, element)
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def eval_trailer(context, atom_contexts, trailer):
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trailer_op, node = trailer.children[:2]
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if node == ')': # `arglist` is optional.
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node = None
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if trailer_op == '[':
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trailer_op, node, _ = trailer.children
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return atom_contexts.get_item(
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eval_subscript_list(context.evaluator, context, node),
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ContextualizedNode(context, trailer)
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)
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else:
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debug.dbg('eval_trailer: %s in %s', trailer, atom_contexts)
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if trailer_op == '.':
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return atom_contexts.py__getattribute__(
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name_context=context,
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name_or_str=node
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)
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else:
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assert trailer_op == '(', 'trailer_op is actually %s' % trailer_op
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args = arguments.TreeArguments(context.evaluator, context, node, trailer)
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return atom_contexts.execute(args)
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def eval_atom(context, atom):
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"""
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Basically to process ``atom`` nodes. The parser sometimes doesn't
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generate the node (because it has just one child). In that case an atom
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might be a name or a literal as well.
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"""
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if atom.type == 'name':
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if atom.value in ('True', 'False', 'None'):
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# Python 2...
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return ContextSet([compiled.builtin_from_name(context.evaluator, atom.value)])
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# This is the first global lookup.
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stmt = tree.search_ancestor(
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atom, 'expr_stmt', 'lambdef'
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) or atom
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if stmt.type == 'lambdef':
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stmt = atom
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position = stmt.start_pos
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if _is_annotation_name(atom):
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# Since Python 3.7 (with from __future__ import annotations),
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# annotations are essentially strings and can reference objects
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# that are defined further down in code. Therefore just set the
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# position to None, so the finder will not try to stop at a certain
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# position in the module.
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position = None
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return context.py__getattribute__(
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name_or_str=atom,
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position=position,
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search_global=True
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)
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elif atom.type == 'keyword':
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# For False/True/None
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if atom.value in ('False', 'True', 'None'):
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return ContextSet([compiled.builtin_from_name(context.evaluator, atom.value)])
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elif atom.value == 'print':
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# print e.g. could be inferred like this in Python 2.7
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return NO_CONTEXTS
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elif atom.value == 'yield':
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# Contrary to yield from, yield can just appear alone to return a
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# value when used with `.send()`.
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return NO_CONTEXTS
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assert False, 'Cannot infer the keyword %s' % atom
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elif isinstance(atom, tree.Literal):
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string = context.evaluator.compiled_subprocess.safe_literal_eval(atom.value)
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return ContextSet([compiled.create_simple_object(context.evaluator, string)])
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elif atom.type == 'strings':
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# Will be multiple string.
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context_set = eval_atom(context, atom.children[0])
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for string in atom.children[1:]:
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right = eval_atom(context, string)
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context_set = _eval_comparison(context.evaluator, context, context_set, u'+', right)
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return context_set
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elif atom.type == 'fstring':
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return compiled.get_string_context_set(context.evaluator)
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else:
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c = atom.children
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# Parentheses without commas are not tuples.
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if c[0] == '(' and not len(c) == 2 \
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and not(c[1].type == 'testlist_comp' and
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len(c[1].children) > 1):
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return context.eval_node(c[1])
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try:
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comp_for = c[1].children[1]
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except (IndexError, AttributeError):
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pass
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else:
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if comp_for == ':':
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# Dict comprehensions have a colon at the 3rd index.
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try:
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comp_for = c[1].children[3]
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except IndexError:
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pass
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if comp_for.type in ('comp_for', 'sync_comp_for'):
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return ContextSet([iterable.comprehension_from_atom(
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context.evaluator, context, atom
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)])
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# It's a dict/list/tuple literal.
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array_node = c[1]
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try:
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array_node_c = array_node.children
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except AttributeError:
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array_node_c = []
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if c[0] == '{' and (array_node == '}' or ':' in array_node_c or
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'**' in array_node_c):
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context = iterable.DictLiteralContext(context.evaluator, context, atom)
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else:
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context = iterable.SequenceLiteralContext(context.evaluator, context, atom)
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return ContextSet([context])
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@_limit_context_infers
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def eval_expr_stmt(context, stmt, seek_name=None):
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with recursion.execution_allowed(context.evaluator, stmt) as allowed:
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# Here we allow list/set to recurse under certain conditions. To make
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# it possible to resolve stuff like list(set(list(x))), this is
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# necessary.
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if not allowed and context.get_root_context() == context.evaluator.builtins_module:
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try:
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instance = context.var_args.instance
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except AttributeError:
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pass
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else:
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if instance.name.string_name in ('list', 'set'):
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c = instance.get_first_non_keyword_argument_contexts()
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if instance not in c:
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allowed = True
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if allowed:
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return _eval_expr_stmt(context, stmt, seek_name)
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return NO_CONTEXTS
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@debug.increase_indent
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def _eval_expr_stmt(context, stmt, seek_name=None):
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"""
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The starting point of the completion. A statement always owns a call
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list, which are the calls, that a statement does. In case multiple
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names are defined in the statement, `seek_name` returns the result for
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this name.
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:param stmt: A `tree.ExprStmt`.
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"""
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debug.dbg('eval_expr_stmt %s (%s)', stmt, seek_name)
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rhs = stmt.get_rhs()
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context_set = context.eval_node(rhs)
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if seek_name:
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c_node = ContextualizedName(context, seek_name)
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context_set = check_tuple_assignments(context.evaluator, c_node, context_set)
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first_operator = next(stmt.yield_operators(), None)
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if first_operator not in ('=', None) and first_operator.type == 'operator':
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# `=` is always the last character in aug assignments -> -1
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operator = copy.copy(first_operator)
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operator.value = operator.value[:-1]
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name = stmt.get_defined_names()[0].value
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left = context.py__getattribute__(
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name, position=stmt.start_pos, search_global=True)
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for_stmt = tree.search_ancestor(stmt, 'for_stmt')
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if for_stmt is not None and for_stmt.type == 'for_stmt' and context_set \
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and parser_utils.for_stmt_defines_one_name(for_stmt):
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# Iterate through result and add the values, that's possible
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# only in for loops without clutter, because they are
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# predictable. Also only do it, if the variable is not a tuple.
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node = for_stmt.get_testlist()
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cn = ContextualizedNode(context, node)
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ordered = list(cn.infer().iterate(cn))
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for lazy_context in ordered:
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dct = {for_stmt.children[1].value: lazy_context.infer()}
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with helpers.predefine_names(context, for_stmt, dct):
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t = context.eval_node(rhs)
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left = _eval_comparison(context.evaluator, context, left, operator, t)
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context_set = left
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else:
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context_set = _eval_comparison(context.evaluator, context, left, operator, context_set)
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debug.dbg('eval_expr_stmt result %s', context_set)
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return context_set
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def eval_or_test(context, or_test):
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iterator = iter(or_test.children)
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types = context.eval_node(next(iterator))
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for operator in iterator:
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right = next(iterator)
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if operator.type == 'comp_op': # not in / is not
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operator = ' '.join(c.value for c in operator.children)
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# handle type inference of and/or here.
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if operator in ('and', 'or'):
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left_bools = set(left.py__bool__() for left in types)
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if left_bools == {True}:
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if operator == 'and':
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types = context.eval_node(right)
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elif left_bools == {False}:
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if operator != 'and':
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types = context.eval_node(right)
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# Otherwise continue, because of uncertainty.
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else:
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types = _eval_comparison(context.evaluator, context, types, operator,
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context.eval_node(right))
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debug.dbg('eval_or_test types %s', types)
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return types
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@iterator_to_context_set
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def eval_factor(context_set, operator):
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"""
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Calculates `+`, `-`, `~` and `not` prefixes.
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"""
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for context in context_set:
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if operator == '-':
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if is_number(context):
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yield context.negate()
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elif operator == 'not':
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value = context.py__bool__()
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if value is None: # Uncertainty.
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return
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yield compiled.create_simple_object(context.evaluator, not value)
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else:
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yield context
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|
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def _literals_to_types(evaluator, result):
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# Changes literals ('a', 1, 1.0, etc) to its type instances (str(),
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# int(), float(), etc).
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new_result = NO_CONTEXTS
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for typ in result:
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if is_literal(typ):
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# Literals are only valid as long as the operations are
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# correct. Otherwise add a value-free instance.
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cls = compiled.builtin_from_name(evaluator, typ.name.string_name)
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new_result |= cls.execute_with_values()
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else:
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new_result |= ContextSet([typ])
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return new_result
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|
|
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def _eval_comparison(evaluator, context, left_contexts, operator, right_contexts):
|
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if not left_contexts or not right_contexts:
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# illegal slices e.g. cause left/right_result to be None
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result = (left_contexts or NO_CONTEXTS) | (right_contexts or NO_CONTEXTS)
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return _literals_to_types(evaluator, result)
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else:
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|
# I don't think there's a reasonable chance that a string
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# operation is still correct, once we pass something like six
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# objects.
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if len(left_contexts) * len(right_contexts) > 6:
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return _literals_to_types(evaluator, left_contexts | right_contexts)
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else:
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return ContextSet.from_sets(
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_eval_comparison_part(evaluator, context, left, operator, right)
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for left in left_contexts
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for right in right_contexts
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)
|
|
|
|
|
|
def _is_annotation_name(name):
|
|
ancestor = tree.search_ancestor(name, 'param', 'funcdef', 'expr_stmt')
|
|
if ancestor is None:
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|
return False
|
|
|
|
if ancestor.type in ('param', 'funcdef'):
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|
ann = ancestor.annotation
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|
if ann is not None:
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|
return ann.start_pos <= name.start_pos < ann.end_pos
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|
elif ancestor.type == 'expr_stmt':
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|
c = ancestor.children
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|
if len(c) > 1 and c[1].type == 'annassign':
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|
return c[1].start_pos <= name.start_pos < c[1].end_pos
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|
return False
|
|
|
|
|
|
def _is_tuple(context):
|
|
return isinstance(context, iterable.Sequence) and context.array_type == 'tuple'
|
|
|
|
|
|
def _is_list(context):
|
|
return isinstance(context, iterable.Sequence) and context.array_type == 'list'
|
|
|
|
|
|
def _bool_to_context(evaluator, bool_):
|
|
return compiled.builtin_from_name(evaluator, force_unicode(str(bool_)))
|
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|
|
|
|
def _get_tuple_ints(context):
|
|
if not isinstance(context, iterable.SequenceLiteralContext):
|
|
return None
|
|
numbers = []
|
|
for lazy_context in context.py__iter__():
|
|
if not isinstance(lazy_context, LazyTreeContext):
|
|
return None
|
|
node = lazy_context.data
|
|
if node.type != 'number':
|
|
return None
|
|
try:
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|
numbers.append(int(node.value))
|
|
except ValueError:
|
|
return None
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|
return numbers
|
|
|
|
|
|
def _eval_comparison_part(evaluator, context, left, operator, right):
|
|
l_is_num = is_number(left)
|
|
r_is_num = is_number(right)
|
|
if isinstance(operator, unicode):
|
|
str_operator = operator
|
|
else:
|
|
str_operator = force_unicode(str(operator.value))
|
|
|
|
if str_operator == '*':
|
|
# for iterables, ignore * operations
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|
if isinstance(left, iterable.Sequence) or is_string(left):
|
|
return ContextSet([left])
|
|
elif isinstance(right, iterable.Sequence) or is_string(right):
|
|
return ContextSet([right])
|
|
elif str_operator == '+':
|
|
if l_is_num and r_is_num or is_string(left) and is_string(right):
|
|
return ContextSet([left.execute_operation(right, str_operator)])
|
|
elif _is_tuple(left) and _is_tuple(right) or _is_list(left) and _is_list(right):
|
|
return ContextSet([iterable.MergedArray(evaluator, (left, right))])
|
|
elif str_operator == '-':
|
|
if l_is_num and r_is_num:
|
|
return ContextSet([left.execute_operation(right, str_operator)])
|
|
elif str_operator == '%':
|
|
# With strings and numbers the left type typically remains. Except for
|
|
# `int() % float()`.
|
|
return ContextSet([left])
|
|
elif str_operator in COMPARISON_OPERATORS:
|
|
if left.is_compiled() and right.is_compiled():
|
|
# Possible, because the return is not an option. Just compare.
|
|
try:
|
|
return ContextSet([left.execute_operation(right, str_operator)])
|
|
except TypeError:
|
|
# Could be True or False.
|
|
pass
|
|
else:
|
|
if str_operator in ('is', '!=', '==', 'is not'):
|
|
operation = COMPARISON_OPERATORS[str_operator]
|
|
bool_ = operation(left, right)
|
|
return ContextSet([_bool_to_context(evaluator, bool_)])
|
|
|
|
if isinstance(left, VersionInfo):
|
|
version_info = _get_tuple_ints(right)
|
|
if version_info is not None:
|
|
bool_result = compiled.access.COMPARISON_OPERATORS[operator](
|
|
evaluator.environment.version_info,
|
|
tuple(version_info)
|
|
)
|
|
return ContextSet([_bool_to_context(evaluator, bool_result)])
|
|
|
|
return ContextSet([_bool_to_context(evaluator, True), _bool_to_context(evaluator, False)])
|
|
elif str_operator == 'in':
|
|
return NO_CONTEXTS
|
|
|
|
def check(obj):
|
|
"""Checks if a Jedi object is either a float or an int."""
|
|
return isinstance(obj, TreeInstance) and \
|
|
obj.name.string_name in ('int', 'float')
|
|
|
|
# Static analysis, one is a number, the other one is not.
|
|
if str_operator in ('+', '-') and l_is_num != r_is_num \
|
|
and not (check(left) or check(right)):
|
|
message = "TypeError: unsupported operand type(s) for +: %s and %s"
|
|
analysis.add(context, 'type-error-operation', operator,
|
|
message % (left, right))
|
|
|
|
result = ContextSet([left, right])
|
|
debug.dbg('Used operator %s resulting in %s', operator, result)
|
|
return result
|
|
|
|
|
|
def _remove_statements(evaluator, context, stmt, name):
|
|
"""
|
|
This is the part where statements are being stripped.
|
|
|
|
Due to lazy type inference, statements like a = func; b = a; b() have to be
|
|
inferred.
|
|
"""
|
|
pep0484_contexts = \
|
|
annotation.find_type_from_comment_hint_assign(context, stmt, name)
|
|
if pep0484_contexts:
|
|
return pep0484_contexts
|
|
|
|
return eval_expr_stmt(context, stmt, seek_name=name)
|
|
|
|
|
|
@plugin_manager.decorate()
|
|
def tree_name_to_contexts(evaluator, context, tree_name):
|
|
context_set = NO_CONTEXTS
|
|
module_node = context.get_root_context().tree_node
|
|
# First check for annotations, like: `foo: int = 3`
|
|
if module_node is not None:
|
|
names = module_node.get_used_names().get(tree_name.value, [])
|
|
for name in names:
|
|
expr_stmt = name.parent
|
|
|
|
if expr_stmt.type == "expr_stmt" and expr_stmt.children[1].type == "annassign":
|
|
correct_scope = parser_utils.get_parent_scope(name) == context.tree_node
|
|
if correct_scope:
|
|
context_set |= annotation.eval_annotation(
|
|
context, expr_stmt.children[1].children[1]
|
|
).execute_annotation()
|
|
if context_set:
|
|
return context_set
|
|
|
|
types = []
|
|
node = tree_name.get_definition(import_name_always=True)
|
|
if node is None:
|
|
node = tree_name.parent
|
|
if node.type == 'global_stmt':
|
|
context = evaluator.create_context(context, tree_name)
|
|
finder = NameFinder(evaluator, context, context, tree_name.value)
|
|
filters = finder.get_filters(search_global=True)
|
|
# For global_stmt lookups, we only need the first possible scope,
|
|
# which means the function itself.
|
|
filters = [next(filters)]
|
|
return finder.find(filters, attribute_lookup=False)
|
|
elif node.type not in ('import_from', 'import_name'):
|
|
context = evaluator.create_context(context, tree_name)
|
|
return eval_atom(context, tree_name)
|
|
|
|
typ = node.type
|
|
if typ == 'for_stmt':
|
|
types = annotation.find_type_from_comment_hint_for(context, node, tree_name)
|
|
if types:
|
|
return types
|
|
if typ == 'with_stmt':
|
|
types = annotation.find_type_from_comment_hint_with(context, node, tree_name)
|
|
if types:
|
|
return types
|
|
|
|
if typ in ('for_stmt', 'comp_for', 'sync_comp_for'):
|
|
try:
|
|
types = context.predefined_names[node][tree_name.value]
|
|
except KeyError:
|
|
cn = ContextualizedNode(context, node.children[3])
|
|
for_types = iterate_contexts(
|
|
cn.infer(),
|
|
contextualized_node=cn,
|
|
is_async=node.parent.type == 'async_stmt',
|
|
)
|
|
c_node = ContextualizedName(context, tree_name)
|
|
types = check_tuple_assignments(evaluator, c_node, for_types)
|
|
elif typ == 'expr_stmt':
|
|
types = _remove_statements(evaluator, context, node, tree_name)
|
|
elif typ == 'with_stmt':
|
|
context_managers = context.eval_node(node.get_test_node_from_name(tree_name))
|
|
enter_methods = context_managers.py__getattribute__(u'__enter__')
|
|
return enter_methods.execute_with_values()
|
|
elif typ in ('import_from', 'import_name'):
|
|
types = imports.infer_import(context, tree_name)
|
|
elif typ in ('funcdef', 'classdef'):
|
|
types = _apply_decorators(context, node)
|
|
elif typ == 'try_stmt':
|
|
# TODO an exception can also be a tuple. Check for those.
|
|
# TODO check for types that are not classes and add it to
|
|
# the static analysis report.
|
|
exceptions = context.eval_node(tree_name.get_previous_sibling().get_previous_sibling())
|
|
types = exceptions.execute_with_values()
|
|
elif node.type == 'param':
|
|
types = NO_CONTEXTS
|
|
else:
|
|
raise ValueError("Should not happen. type: %s" % typ)
|
|
return types
|
|
|
|
|
|
# We don't want to have functions/classes that are created by the same
|
|
# tree_node.
|
|
@evaluator_method_cache()
|
|
def _apply_decorators(context, node):
|
|
"""
|
|
Returns the function, that should to be executed in the end.
|
|
This is also the places where the decorators are processed.
|
|
"""
|
|
if node.type == 'classdef':
|
|
decoratee_context = ClassContext(
|
|
context.evaluator,
|
|
parent_context=context,
|
|
tree_node=node
|
|
)
|
|
else:
|
|
decoratee_context = FunctionContext.from_context(context, node)
|
|
initial = values = ContextSet([decoratee_context])
|
|
for dec in reversed(node.get_decorators()):
|
|
debug.dbg('decorator: %s %s', dec, values, color="MAGENTA")
|
|
with debug.increase_indent_cm():
|
|
dec_values = context.eval_node(dec.children[1])
|
|
trailer_nodes = dec.children[2:-1]
|
|
if trailer_nodes:
|
|
# Create a trailer and infer it.
|
|
trailer = tree.PythonNode('trailer', trailer_nodes)
|
|
trailer.parent = dec
|
|
dec_values = eval_trailer(context, dec_values, trailer)
|
|
|
|
if not len(dec_values):
|
|
code = dec.get_code(include_prefix=False)
|
|
# For the short future, we don't want to hear about the runtime
|
|
# decorator in typing that was intentionally omitted. This is not
|
|
# "correct", but helps with debugging.
|
|
if code != '@runtime\n':
|
|
debug.warning('decorator not found: %s on %s', dec, node)
|
|
return initial
|
|
|
|
values = dec_values.execute(arguments.ValuesArguments([values]))
|
|
if not len(values):
|
|
debug.warning('not possible to resolve wrappers found %s', node)
|
|
return initial
|
|
|
|
debug.dbg('decorator end %s', values, color="MAGENTA")
|
|
if values != initial:
|
|
return ContextSet([Decoratee(c, decoratee_context) for c in values])
|
|
return values
|
|
|
|
|
|
def check_tuple_assignments(evaluator, contextualized_name, context_set):
|
|
"""
|
|
Checks if tuples are assigned.
|
|
"""
|
|
lazy_context = None
|
|
for index, node in contextualized_name.assignment_indexes():
|
|
cn = ContextualizedNode(contextualized_name.context, node)
|
|
iterated = context_set.iterate(cn)
|
|
if isinstance(index, slice):
|
|
# For no star unpacking is not possible.
|
|
return NO_CONTEXTS
|
|
for _ in range(index + 1):
|
|
try:
|
|
lazy_context = next(iterated)
|
|
except StopIteration:
|
|
# We could do this with the default param in next. But this
|
|
# would allow this loop to run for a very long time if the
|
|
# index number is high. Therefore break if the loop is
|
|
# finished.
|
|
return NO_CONTEXTS
|
|
context_set = lazy_context.infer()
|
|
return context_set
|
|
|
|
|
|
def eval_subscript_list(evaluator, context, index):
|
|
"""
|
|
Handles slices in subscript nodes.
|
|
"""
|
|
if index == ':':
|
|
# Like array[:]
|
|
return ContextSet([iterable.Slice(context, None, None, None)])
|
|
|
|
elif index.type == 'subscript' and not index.children[0] == '.':
|
|
# subscript basically implies a slice operation, except for Python 2's
|
|
# Ellipsis.
|
|
# e.g. array[:3]
|
|
result = []
|
|
for el in index.children:
|
|
if el == ':':
|
|
if not result:
|
|
result.append(None)
|
|
elif el.type == 'sliceop':
|
|
if len(el.children) == 2:
|
|
result.append(el.children[1])
|
|
else:
|
|
result.append(el)
|
|
result += [None] * (3 - len(result))
|
|
|
|
return ContextSet([iterable.Slice(context, *result)])
|
|
elif index.type == 'subscriptlist':
|
|
return ContextSet([iterable.SequenceLiteralContext(evaluator, context, index)])
|
|
|
|
# No slices
|
|
return context.eval_node(index)
|