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293 lines
12 KiB
293 lines
12 KiB
6 years ago
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from parso.python.token import PythonTokenTypes
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from parso.python import tree
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from parso.tree import search_ancestor, Leaf
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from jedi._compatibility import Parameter
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from jedi import debug
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from jedi import settings
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from jedi.api import classes
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from jedi.api import helpers
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from jedi.evaluate import imports
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from jedi.api import keywords
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from jedi.evaluate.helpers import evaluate_call_of_leaf
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from jedi.evaluate.filters import get_global_filters
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from jedi.parser_utils import get_statement_of_position
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def get_call_signature_param_names(call_signatures):
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# add named params
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for call_sig in call_signatures:
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for p in call_sig.params:
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# Allow protected access, because it's a public API.
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if p._name.get_kind() in (Parameter.POSITIONAL_OR_KEYWORD,
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Parameter.KEYWORD_ONLY):
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yield p._name
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def filter_names(evaluator, completion_names, stack, like_name):
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comp_dct = {}
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if settings.case_insensitive_completion:
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like_name = like_name.lower()
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for name in completion_names:
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string = name.string_name
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if settings.case_insensitive_completion:
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string = string.lower()
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if string.startswith(like_name):
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new = classes.Completion(
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evaluator,
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name,
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stack,
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len(like_name)
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)
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k = (new.name, new.complete) # key
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if k in comp_dct and settings.no_completion_duplicates:
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comp_dct[k]._same_name_completions.append(new)
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else:
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comp_dct[k] = new
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yield new
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def get_user_scope(module_context, position):
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"""
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Returns the scope in which the user resides. This includes flows.
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"""
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user_stmt = get_statement_of_position(module_context.tree_node, position)
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if user_stmt is None:
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def scan(scope):
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for s in scope.children:
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if s.start_pos <= position <= s.end_pos:
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if isinstance(s, (tree.Scope, tree.Flow)) \
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or s.type in ('async_stmt', 'async_funcdef'):
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return scan(s) or s
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elif s.type in ('suite', 'decorated'):
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return scan(s)
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return None
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scanned_node = scan(module_context.tree_node)
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if scanned_node:
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return module_context.create_context(scanned_node, node_is_context=True)
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return module_context
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else:
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return module_context.create_context(user_stmt)
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def get_flow_scope_node(module_node, position):
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node = module_node.get_leaf_for_position(position, include_prefixes=True)
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while not isinstance(node, (tree.Scope, tree.Flow)):
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node = node.parent
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return node
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class Completion:
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def __init__(self, evaluator, module, code_lines, position, call_signatures_method):
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self._evaluator = evaluator
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self._module_context = module
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self._module_node = module.tree_node
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self._code_lines = code_lines
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# The first step of completions is to get the name
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self._like_name = helpers.get_on_completion_name(self._module_node, code_lines, position)
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# The actual cursor position is not what we need to calculate
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# everything. We want the start of the name we're on.
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self._position = position[0], position[1] - len(self._like_name)
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self._call_signatures_method = call_signatures_method
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def completions(self):
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completion_names = self._get_context_completions()
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completions = filter_names(self._evaluator, completion_names,
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self.stack, self._like_name)
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return sorted(completions, key=lambda x: (x.name.startswith('__'),
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x.name.startswith('_'),
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x.name.lower()))
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def _get_context_completions(self):
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"""
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Analyzes the context that a completion is made in and decides what to
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return.
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Technically this works by generating a parser stack and analysing the
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current stack for possible grammar nodes.
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Possible enhancements:
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- global/nonlocal search global
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- yield from / raise from <- could be only exceptions/generators
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- In args: */**: no completion
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- In params (also lambda): no completion before =
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"""
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grammar = self._evaluator.grammar
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try:
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self.stack = stack = helpers.get_stack_at_position(
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grammar, self._code_lines, self._module_node, self._position
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)
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except helpers.OnErrorLeaf as e:
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self.stack = stack = None
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if e.error_leaf.value == '.':
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# After ErrorLeaf's that are dots, we will not do any
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# completions since this probably just confuses the user.
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return []
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# If we don't have a context, just use global completion.
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return self._global_completions()
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allowed_transitions = \
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list(stack._allowed_transition_names_and_token_types())
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if 'if' in allowed_transitions:
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leaf = self._module_node.get_leaf_for_position(self._position, include_prefixes=True)
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previous_leaf = leaf.get_previous_leaf()
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indent = self._position[1]
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if not (leaf.start_pos <= self._position <= leaf.end_pos):
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indent = leaf.start_pos[1]
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if previous_leaf is not None:
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stmt = previous_leaf
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while True:
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stmt = search_ancestor(
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stmt, 'if_stmt', 'for_stmt', 'while_stmt', 'try_stmt',
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'error_node',
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)
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if stmt is None:
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break
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type_ = stmt.type
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if type_ == 'error_node':
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first = stmt.children[0]
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if isinstance(first, Leaf):
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type_ = first.value + '_stmt'
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# Compare indents
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if stmt.start_pos[1] == indent:
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if type_ == 'if_stmt':
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allowed_transitions += ['elif', 'else']
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elif type_ == 'try_stmt':
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allowed_transitions += ['except', 'finally', 'else']
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elif type_ == 'for_stmt':
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allowed_transitions.append('else')
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completion_names = list(self._get_keyword_completion_names(allowed_transitions))
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if any(t in allowed_transitions for t in (PythonTokenTypes.NAME,
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PythonTokenTypes.INDENT)):
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# This means that we actually have to do type inference.
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nonterminals = [stack_node.nonterminal for stack_node in stack]
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nodes = [node for stack_node in stack for node in stack_node.nodes]
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if nodes and nodes[-1] in ('as', 'def', 'class'):
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# No completions for ``with x as foo`` and ``import x as foo``.
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# Also true for defining names as a class or function.
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return list(self._get_class_context_completions(is_function=True))
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elif "import_stmt" in nonterminals:
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level, names = self._parse_dotted_names(nodes, "import_from" in nonterminals)
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only_modules = not ("import_from" in nonterminals and 'import' in nodes)
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completion_names += self._get_importer_names(
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names,
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level,
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only_modules=only_modules,
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)
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elif nonterminals[-1] in ('trailer', 'dotted_name') and nodes[-1] == '.':
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dot = self._module_node.get_leaf_for_position(self._position)
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completion_names += self._trailer_completions(dot.get_previous_leaf())
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else:
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completion_names += self._global_completions()
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completion_names += self._get_class_context_completions(is_function=False)
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if 'trailer' in nonterminals:
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call_signatures = self._call_signatures_method()
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completion_names += get_call_signature_param_names(call_signatures)
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return completion_names
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def _get_keyword_completion_names(self, allowed_transitions):
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for k in allowed_transitions:
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if isinstance(k, str) and k.isalpha():
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yield keywords.KeywordName(self._evaluator, k)
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def _global_completions(self):
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context = get_user_scope(self._module_context, self._position)
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debug.dbg('global completion scope: %s', context)
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flow_scope_node = get_flow_scope_node(self._module_node, self._position)
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filters = get_global_filters(
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self._evaluator,
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context,
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self._position,
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origin_scope=flow_scope_node
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)
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completion_names = []
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for filter in filters:
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completion_names += filter.values()
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return completion_names
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def _trailer_completions(self, previous_leaf):
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user_context = get_user_scope(self._module_context, self._position)
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evaluation_context = self._evaluator.create_context(
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self._module_context, previous_leaf
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)
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contexts = evaluate_call_of_leaf(evaluation_context, previous_leaf)
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completion_names = []
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debug.dbg('trailer completion contexts: %s', contexts)
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for context in contexts:
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for filter in context.get_filters(
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search_global=False, origin_scope=user_context.tree_node):
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completion_names += filter.values()
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return completion_names
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def _parse_dotted_names(self, nodes, is_import_from):
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level = 0
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names = []
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for node in nodes[1:]:
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if node in ('.', '...'):
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if not names:
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level += len(node.value)
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elif node.type == 'dotted_name':
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names += node.children[::2]
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elif node.type == 'name':
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names.append(node)
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elif node == ',':
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if not is_import_from:
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names = []
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else:
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# Here if the keyword `import` comes along it stops checking
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# for names.
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break
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return level, names
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def _get_importer_names(self, names, level=0, only_modules=True):
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names = [n.value for n in names]
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i = imports.Importer(self._evaluator, names, self._module_context, level)
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return i.completion_names(self._evaluator, only_modules=only_modules)
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def _get_class_context_completions(self, is_function=True):
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"""
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Autocomplete inherited methods when overriding in child class.
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"""
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leaf = self._module_node.get_leaf_for_position(self._position, include_prefixes=True)
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cls = tree.search_ancestor(leaf, 'classdef')
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if isinstance(cls, (tree.Class, tree.Function)):
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# Complete the methods that are defined in the super classes.
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random_context = self._module_context.create_context(
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cls,
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node_is_context=True
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)
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else:
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return
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if cls.start_pos[1] >= leaf.start_pos[1]:
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return
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filters = random_context.get_filters(search_global=False, is_instance=True)
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# The first dict is the dictionary of class itself.
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next(filters)
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for filter in filters:
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for name in filter.values():
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if (name.api_type == 'function') == is_function:
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yield name
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