forked from VimPlug/jedi
215 lines
6.9 KiB
Python
215 lines
6.9 KiB
Python
"""
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Helpers for the API
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"""
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import re
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from collections import namedtuple
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from jedi import common
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from jedi.parser import tree as pt
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from jedi.evaluate import imports
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from jedi import parser
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from jedi.parser import tokenize, token
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CompletionParts = namedtuple('CompletionParts', ['path', 'has_dot', 'name'])
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def get_completion_parts(path_until_cursor):
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"""
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Returns the parts for the completion
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:return: tuple - (path, dot, like)
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"""
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match = re.match(r'^(.*?)(\.|)(\w?[\w\d]*)$', path_until_cursor, flags=re.S)
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path, dot, name = match.groups()
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return CompletionParts(path, bool(dot), name)
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def sorted_definitions(defs):
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# Note: `or ''` below is required because `module_path` could be
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return sorted(defs, key=lambda x: (x.module_path or '', x.line or 0, x.column or 0))
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def get_on_import_stmt(evaluator, user_context, user_stmt, is_like_search=False):
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"""
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Resolve the user statement, if it is an import. Only resolve the
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parts until the user position.
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"""
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name = user_stmt.name_for_position(user_context.position)
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if name is None:
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return None, None
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i = imports.ImportWrapper(evaluator, name)
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return i, name
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def check_error_statements(module, pos):
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for error_statement in module.error_statements:
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if error_statement.first_type in ('import_from', 'import_name') \
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and error_statement.start_pos < pos <= error_statement.end_pos:
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return importer_from_error_statement(error_statement, pos)
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return None, 0, False, False
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def _get_code(code, start_pos, end_pos):
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"""
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:param code_start_pos: is where the code starts.
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"""
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lines = common.splitlines(code)
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# Get relevant lines.
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lines = lines[start_pos[0] - 1:end_pos[0]]
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# Remove the parts at the end of the line.
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lines[-1] = lines[-1][:end_pos[1]]
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# Remove first line indentation.
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lines[0] = lines[0][start_pos[1]:]
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return '\n'.join(lines)
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class OnErrorLeaf(Exception):
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@property
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def error_leaf(self):
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return self.args[0]
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def get_stack_at_position(grammar, source, module, pos):
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"""
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Returns the possible node names (e.g. import_from, xor_test or yield_stmt).
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"""
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user_stmt = module.get_statement_for_position(pos)
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if user_stmt is not None and user_stmt.type in ('indent', 'dedent'):
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code = ''
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else:
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if user_stmt is None:
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user_stmt = module.get_leaf_for_position(pos, include_prefixes=True)
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if pos <= user_stmt.start_pos:
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try:
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leaf = user_stmt.get_previous_leaf()
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except IndexError:
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pass
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else:
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user_stmt = module.get_statement_for_position(leaf.start_pos)
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if user_stmt.type == 'error_leaf' or user_stmt.type == 'string':
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# Error leafs cannot be parsed, completion in strings is also
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# impossible.
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raise OnErrorLeaf(user_stmt)
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code = _get_code(source, user_stmt.start_pos, pos)
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if code == ';':
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# ; cannot be parsed.
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code = ''
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# Remove whitespace at the end. Necessary, because the tokenizer will parse
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# an error token (there's no new line at the end in our case). This doesn't
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# alter any truth about the valid tokens at that position.
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code = code.strip('\t ')
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class EndMarkerReached(Exception):
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pass
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def tokenize_without_endmarker(code):
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tokens = tokenize.source_tokens(code, use_exact_op_types=True)
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for token_ in tokens:
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if token_[0] == token.ENDMARKER:
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raise EndMarkerReached()
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elif token_[0] == token.DEDENT:
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# Ignore those. Error statements should not contain them, if
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# they do it's for cases where an indentation happens and
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# before the endmarker we still see them.
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pass
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else:
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yield token_
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p = parser.Parser(grammar, code, start_parsing=False)
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try:
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p.parse(tokenizer=tokenize_without_endmarker(code))
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except EndMarkerReached:
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return Stack(p.pgen_parser.stack)
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class Stack(list):
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def get_node_names(self, grammar):
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for dfa, state, (node_number, nodes) in self:
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yield grammar.number2symbol[node_number]
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def get_nodes(self):
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for dfa, state, (node_number, nodes) in self:
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for node in nodes:
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yield node
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def get_possible_completion_types(grammar, stack):
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def add_results(label_index):
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try:
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grammar_labels.append(inversed_tokens[label_index])
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except KeyError:
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try:
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keywords.append(inversed_keywords[label_index])
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except KeyError:
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t, v = grammar.labels[label_index]
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assert t >= 256
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# See if it's a symbol and if we're in its first set
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inversed_keywords
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itsdfa = grammar.dfas[t]
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itsstates, itsfirst = itsdfa
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for first_label_index in itsfirst.keys():
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add_results(first_label_index)
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inversed_keywords = dict((v, k) for k, v in grammar.keywords.items())
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inversed_tokens = dict((v, k) for k, v in grammar.tokens.items())
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keywords = []
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grammar_labels = []
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def scan_stack(index):
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dfa, state, node = stack[index]
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states, first = dfa
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arcs = states[state]
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for label_index, new_state in arcs:
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if label_index == 0:
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# An accepting state, check the stack below.
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scan_stack(index - 1)
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else:
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add_results(label_index)
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scan_stack(-1)
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return keywords, grammar_labels
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def importer_from_error_statement(error_statement, pos):
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def check_dotted(children):
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for name in children[::2]:
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if name.start_pos <= pos:
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yield name
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names = []
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level = 0
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only_modules = True
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unfinished_dotted = False
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for typ, nodes in error_statement.stack:
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if typ == 'dotted_name':
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names += check_dotted(nodes)
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if nodes[-1] == '.':
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# An unfinished dotted_name
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unfinished_dotted = True
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elif typ == 'import_name':
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if nodes[0].start_pos <= pos <= nodes[0].end_pos:
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# We are on the import.
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return None, 0, False, False
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elif typ == 'import_from':
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for node in nodes:
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if node.start_pos >= pos:
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break
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elif isinstance(node, pt.Node) and node.type == 'dotted_name':
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names += check_dotted(node.children)
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elif node in ('.', '...'):
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level += len(node.value)
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elif isinstance(node, pt.Name):
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names.append(node)
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elif node == 'import':
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only_modules = False
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return names, level, only_modules, unfinished_dotted
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