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346 lines
11 KiB
Python
346 lines
11 KiB
Python
import re
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import textwrap
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from ast import literal_eval
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from inspect import cleandoc
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from weakref import WeakKeyDictionary
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from parso.python import tree
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from parso.cache import parser_cache
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from parso import split_lines
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_EXECUTE_NODES = {'funcdef', 'classdef', 'import_from', 'import_name', 'test',
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'or_test', 'and_test', 'not_test', 'comparison', 'expr',
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'xor_expr', 'and_expr', 'shift_expr', 'arith_expr',
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'atom_expr', 'term', 'factor', 'power', 'atom'}
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_FLOW_KEYWORDS = (
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'try', 'except', 'finally', 'else', 'if', 'elif', 'with', 'for', 'while'
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)
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def get_executable_nodes(node, last_added=False):
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"""
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For static analysis.
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"""
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result = []
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typ = node.type
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if typ == 'name':
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next_leaf = node.get_next_leaf()
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if last_added is False and node.parent.type != 'param' and next_leaf != '=':
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result.append(node)
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elif typ == 'expr_stmt':
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# I think inferring the statement (and possibly returned arrays),
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# should be enough for static analysis.
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result.append(node)
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for child in node.children:
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result += get_executable_nodes(child, last_added=True)
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elif typ == 'decorator':
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# decorator
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if node.children[-2] == ')':
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node = node.children[-3]
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if node != '(':
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result += get_executable_nodes(node)
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else:
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try:
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children = node.children
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except AttributeError:
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pass
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else:
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if node.type in _EXECUTE_NODES and not last_added:
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result.append(node)
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for child in children:
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result += get_executable_nodes(child, last_added)
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return result
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def get_sync_comp_fors(comp_for):
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yield comp_for
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last = comp_for.children[-1]
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while True:
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if last.type == 'comp_for':
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yield last.children[1] # Ignore the async.
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elif last.type == 'sync_comp_for':
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yield last
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elif not last.type == 'comp_if':
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break
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last = last.children[-1]
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def for_stmt_defines_one_name(for_stmt):
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"""
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Returns True if only one name is returned: ``for x in y``.
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Returns False if the for loop is more complicated: ``for x, z in y``.
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:returns: bool
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"""
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return for_stmt.children[1].type == 'name'
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def get_flow_branch_keyword(flow_node, node):
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start_pos = node.start_pos
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if not (flow_node.start_pos < start_pos <= flow_node.end_pos):
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raise ValueError('The node is not part of the flow.')
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keyword = None
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for i, child in enumerate(flow_node.children):
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if start_pos < child.start_pos:
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return keyword
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first_leaf = child.get_first_leaf()
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if first_leaf in _FLOW_KEYWORDS:
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keyword = first_leaf
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return None
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def clean_scope_docstring(scope_node):
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""" Returns a cleaned version of the docstring token. """
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node = scope_node.get_doc_node()
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if node is not None:
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# TODO We have to check next leaves until there are no new
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# leaves anymore that might be part of the docstring. A
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# docstring can also look like this: ``'foo' 'bar'
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# Returns a literal cleaned version of the ``Token``.
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return cleandoc(safe_literal_eval(node.value))
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return ''
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def find_statement_documentation(tree_node):
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if tree_node.type == 'expr_stmt':
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tree_node = tree_node.parent # simple_stmt
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maybe_string = tree_node.get_next_sibling()
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if maybe_string is not None:
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if maybe_string.type == 'simple_stmt':
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maybe_string = maybe_string.children[0]
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if maybe_string.type == 'string':
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return cleandoc(safe_literal_eval(maybe_string.value))
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return ''
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def safe_literal_eval(value):
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first_two = value[:2].lower()
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if first_two[0] == 'f' or first_two in ('fr', 'rf'):
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# literal_eval is not able to resovle f literals. We have to do that
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# manually, but that's right now not implemented.
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return ''
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return literal_eval(value)
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def get_signature(funcdef, width=72, call_string=None,
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omit_first_param=False, omit_return_annotation=False):
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"""
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Generate a string signature of a function.
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:param width: Fold lines if a line is longer than this value.
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:type width: int
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:arg func_name: Override function name when given.
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:type func_name: str
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:rtype: str
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"""
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# Lambdas have no name.
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if call_string is None:
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if funcdef.type == 'lambdef':
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call_string = '<lambda>'
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else:
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call_string = funcdef.name.value
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params = funcdef.get_params()
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if omit_first_param:
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params = params[1:]
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p = '(' + ''.join(param.get_code() for param in params).strip() + ')'
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# TODO this is pretty bad, we should probably just normalize.
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p = re.sub(r'\s+', ' ', p)
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if funcdef.annotation and not omit_return_annotation:
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rtype = " ->" + funcdef.annotation.get_code()
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else:
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rtype = ""
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code = call_string + p + rtype
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return '\n'.join(textwrap.wrap(code, width))
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def move(node, line_offset):
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"""
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Move the `Node` start_pos.
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"""
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try:
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children = node.children
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except AttributeError:
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node.line += line_offset
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else:
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for c in children:
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move(c, line_offset)
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def get_following_comment_same_line(node):
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"""
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returns (as string) any comment that appears on the same line,
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after the node, including the #
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"""
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try:
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if node.type == 'for_stmt':
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whitespace = node.children[5].get_first_leaf().prefix
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elif node.type == 'with_stmt':
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whitespace = node.children[3].get_first_leaf().prefix
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elif node.type == 'funcdef':
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# actually on the next line
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whitespace = node.children[4].get_first_leaf().get_next_leaf().prefix
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else:
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whitespace = node.get_last_leaf().get_next_leaf().prefix
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except AttributeError:
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return None
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except ValueError:
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# TODO in some particular cases, the tree doesn't seem to be linked
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# correctly
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return None
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if "#" not in whitespace:
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return None
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comment = whitespace[whitespace.index("#"):]
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if "\r" in comment:
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comment = comment[:comment.index("\r")]
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if "\n" in comment:
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comment = comment[:comment.index("\n")]
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return comment
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def is_scope(node):
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t = node.type
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if t == 'comp_for':
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# Starting with Python 3.8, async is outside of the statement.
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return node.children[1].type != 'sync_comp_for'
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return t in ('file_input', 'classdef', 'funcdef', 'lambdef', 'sync_comp_for')
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def _get_parent_scope_cache(func):
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cache = WeakKeyDictionary()
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def wrapper(parso_cache_node, node, include_flows=False):
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if parso_cache_node is None:
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return func(node, include_flows)
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try:
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for_module = cache[parso_cache_node]
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except KeyError:
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for_module = cache[parso_cache_node] = {}
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try:
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return for_module[node]
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except KeyError:
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result = for_module[node] = func(node, include_flows)
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return result
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return wrapper
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def get_parent_scope(node, include_flows=False):
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"""
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Returns the underlying scope.
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"""
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scope = node.parent
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if scope is None:
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return None # It's a module already.
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while True:
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if is_scope(scope):
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if scope.type in ('classdef', 'funcdef', 'lambdef'):
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index = scope.children.index(':')
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if scope.children[index].start_pos >= node.start_pos:
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if node.parent.type == 'param' and node.parent.name == node:
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pass
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elif node.parent.type == 'tfpdef' and node.parent.children[0] == node:
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pass
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else:
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scope = scope.parent
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continue
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return scope
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elif include_flows and isinstance(scope, tree.Flow):
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# The cursor might be on `if foo`, so the parent scope will not be
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# the if, but the parent of the if.
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if not (scope.type == 'if_stmt'
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and any(n.start_pos <= node.start_pos < n.end_pos
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for n in scope.get_test_nodes())):
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return scope
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scope = scope.parent
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get_cached_parent_scope = _get_parent_scope_cache(get_parent_scope)
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def get_cached_code_lines(grammar, path):
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"""
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Basically access the cached code lines in parso. This is not the nicest way
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to do this, but we avoid splitting all the lines again.
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"""
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return get_parso_cache_node(grammar, path).lines
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def get_parso_cache_node(grammar, path):
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"""
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This is of course not public. But as long as I control parso, this
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shouldn't be a problem. ~ Dave
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The reason for this is mostly caching. This is obviously also a sign of a
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broken caching architecture.
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"""
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return parser_cache[grammar._hashed][path]
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def cut_value_at_position(leaf, position):
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"""
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Cuts of the value of the leaf at position
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"""
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lines = split_lines(leaf.value, keepends=True)[:position[0] - leaf.line + 1]
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column = position[1]
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if leaf.line == position[0]:
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column -= leaf.column
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if not lines:
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return ''
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lines[-1] = lines[-1][:column]
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return ''.join(lines)
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def expr_is_dotted(node):
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"""
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Checks if a path looks like `name` or `name.foo.bar` and not `name()`.
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"""
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if node.type == 'atom':
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if len(node.children) == 3 and node.children[0] == '(':
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return expr_is_dotted(node.children[1])
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return False
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if node.type == 'atom_expr':
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children = node.children
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if children[0] == 'await':
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return False
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if not expr_is_dotted(children[0]):
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return False
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# Check trailers
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return all(c.children[0] == '.' for c in children[1:])
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return node.type == 'name'
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def _function_is_x_method(decorator_checker):
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def wrapper(function_node):
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"""
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This is a heuristic. It will not hold ALL the times, but it will be
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correct pretty much for anyone that doesn't try to beat it.
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staticmethod/classmethod are builtins and unless overwritten, this will
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be correct.
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"""
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for decorator in function_node.get_decorators():
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dotted_name = decorator.children[1]
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if decorator_checker(dotted_name.get_code()):
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return True
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return False
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return wrapper
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function_is_staticmethod = _function_is_x_method(lambda m: m == "staticmethod")
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function_is_classmethod = _function_is_x_method(lambda m: m == "classmethod")
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function_is_property = _function_is_x_method(
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lambda m: m == "property"
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or m == "cached_property"
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or (m.endswith(".setter"))
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)
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