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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt
from __future__ import annotations
import collections
import sys
import warnings
from collections import defaultdict
from collections.abc import Iterator
from typing import TYPE_CHECKING, Dict
from astroid import nodes
from pylint.constants import (
INCOMPATIBLE_WITH_USELESS_SUPPRESSION,
MSG_STATE_SCOPE_MODULE,
WarningScope,
)
if sys.version_info >= (3, 8):
from typing import Literal
else:
from typing_extensions import Literal
if TYPE_CHECKING:
from pylint.message import MessageDefinition, MessageDefinitionStore
MessageStateDict = Dict[str, Dict[int, bool]]
class FileState:
"""Hold internal state specific to the currently analyzed file."""
def __init__(
self,
modname: str | None = None,
msg_store: MessageDefinitionStore | None = None,
node: nodes.Module | None = None,
*,
is_base_filestate: bool = False,
) -> None:
if modname is None:
warnings.warn(
"FileState needs a string as modname argument. "
"This argument will be required in pylint 3.0",
DeprecationWarning,
stacklevel=2,
)
if msg_store is None:
warnings.warn(
"FileState needs a 'MessageDefinitionStore' as msg_store argument. "
"This argument will be required in pylint 3.0",
DeprecationWarning,
stacklevel=2,
)
self.base_name = modname
self._module_msgs_state: MessageStateDict = {}
self._raw_module_msgs_state: MessageStateDict = {}
self._ignored_msgs: defaultdict[
tuple[str, int], set[int]
] = collections.defaultdict(set)
self._suppression_mapping: dict[tuple[str, int], int] = {}
self._module = node
if node:
self._effective_max_line_number = node.tolineno
else:
self._effective_max_line_number = None
self._msgs_store = msg_store
self._is_base_filestate = is_base_filestate
"""If this FileState is the base state made during initialization of
PyLinter.
"""
def collect_block_lines(
self, msgs_store: MessageDefinitionStore, module_node: nodes.Module
) -> None:
"""Walk the AST to collect block level options line numbers."""
warnings.warn(
"'collect_block_lines' has been deprecated and will be removed in pylint 3.0.",
DeprecationWarning,
stacklevel=2,
)
for msg, lines in self._module_msgs_state.items():
self._raw_module_msgs_state[msg] = lines.copy()
orig_state = self._module_msgs_state.copy()
self._module_msgs_state = {}
self._suppression_mapping = {}
self._effective_max_line_number = module_node.tolineno
for msgid, lines in orig_state.items():
for msgdef in msgs_store.get_message_definitions(msgid):
self._set_state_on_block_lines(msgs_store, module_node, msgdef, lines)
def _set_state_on_block_lines(
self,
msgs_store: MessageDefinitionStore,
node: nodes.NodeNG,
msg: MessageDefinition,
msg_state: dict[int, bool],
) -> None:
"""Recursively walk (depth first) AST to collect block level options
line numbers and set the state correctly.
"""
for child in node.get_children():
self._set_state_on_block_lines(msgs_store, child, msg, msg_state)
# first child line number used to distinguish between disable
# which are the first child of scoped node with those defined later.
# For instance in the code below:
#
# 1. def meth8(self):
# 2. """test late disabling"""
# 3. pylint: disable=not-callable, useless-suppression
# 4. print(self.blip)
# 5. pylint: disable=no-member, useless-suppression
# 6. print(self.bla)
#
# E1102 should be disabled from line 1 to 6 while E1101 from line 5 to 6
#
# this is necessary to disable locally messages applying to class /
# function using their fromlineno
if (
isinstance(node, (nodes.Module, nodes.ClassDef, nodes.FunctionDef))
and node.body
):
firstchildlineno = node.body[0].fromlineno
else:
firstchildlineno = node.tolineno
self._set_message_state_in_block(msg, msg_state, node, firstchildlineno)
def _set_message_state_in_block(
self,
msg: MessageDefinition,
lines: dict[int, bool],
node: nodes.NodeNG,
firstchildlineno: int,
) -> None:
"""Set the state of a message in a block of lines."""
first = node.fromlineno
last = node.tolineno
for lineno, state in list(lines.items()):
original_lineno = lineno
if first > lineno or last < lineno:
continue
# Set state for all lines for this block, if the
# warning is applied to nodes.
if msg.scope == WarningScope.NODE:
if lineno > firstchildlineno:
state = True
first_, last_ = node.block_range(lineno)
# pylint: disable=useless-suppression
# For block nodes first_ is their definition line. For example, we
# set the state of line zero for a module to allow disabling
# invalid-name for the module. For example:
# 1. # pylint: disable=invalid-name
# 2. ...
# OR
# 1. """Module docstring"""
# 2. # pylint: disable=invalid-name
# 3. ...
#
# But if we already visited line 0 we don't need to set its state again
# 1. # pylint: disable=invalid-name
# 2. # pylint: enable=invalid-name
# 3. ...
# The state should come from line 1, not from line 2
# Therefore, if the 'fromlineno' is already in the states we just start
# with the lineno we were originally visiting.
# pylint: enable=useless-suppression
if (
first_ == node.fromlineno
and first_ >= firstchildlineno
and node.fromlineno in self._module_msgs_state.get(msg.msgid, ())
):
first_ = lineno
else:
first_ = lineno
last_ = last
for line in range(first_, last_ + 1):
# Do not override existing entries. This is especially important
# when parsing the states for a scoped node where some line-disables
# have already been parsed.
if (
(
isinstance(node, nodes.Module)
and node.fromlineno <= line < lineno
)
or (
not isinstance(node, nodes.Module)
and node.fromlineno < line < lineno
)
) and line in self._module_msgs_state.get(msg.msgid, ()):
continue
if line in lines: # state change in the same block
state = lines[line]
original_lineno = line
self._set_message_state_on_line(msg, line, state, original_lineno)
del lines[lineno]
def _set_message_state_on_line(
self,
msg: MessageDefinition,
line: int,
state: bool,
original_lineno: int,
) -> None:
"""Set the state of a message on a line."""
# Update suppression mapping
if not state:
self._suppression_mapping[(msg.msgid, line)] = original_lineno
else:
self._suppression_mapping.pop((msg.msgid, line), None)
# Update message state for respective line
try:
self._module_msgs_state[msg.msgid][line] = state
except KeyError:
self._module_msgs_state[msg.msgid] = {line: state}
def set_msg_status(
self,
msg: MessageDefinition,
line: int,
status: bool,
scope: str = "package",
) -> None:
"""Set status (enabled/disable) for a given message at a given line."""
assert line > 0
assert self._module
# TODO: 3.0: Remove unnecessary assertion
assert self._msgs_store
if scope != "line":
# Expand the status to cover all relevant block lines
self._set_state_on_block_lines(
self._msgs_store, self._module, msg, {line: status}
)
else:
self._set_message_state_on_line(msg, line, status, line)
# Store the raw value
try:
self._raw_module_msgs_state[msg.msgid][line] = status
except KeyError:
self._raw_module_msgs_state[msg.msgid] = {line: status}
def handle_ignored_message(
self, state_scope: Literal[0, 1, 2] | None, msgid: str, line: int | None
) -> None:
"""Report an ignored message.
state_scope is either MSG_STATE_SCOPE_MODULE or MSG_STATE_SCOPE_CONFIG,
depending on whether the message was disabled locally in the module,
or globally.
"""
if state_scope == MSG_STATE_SCOPE_MODULE:
assert isinstance(line, int) # should always be int inside module scope
try:
orig_line = self._suppression_mapping[(msgid, line)]
self._ignored_msgs[(msgid, orig_line)].add(line)
except KeyError:
pass
def iter_spurious_suppression_messages(
self,
msgs_store: MessageDefinitionStore,
) -> Iterator[
tuple[
Literal["useless-suppression", "suppressed-message"],
int,
tuple[str] | tuple[str, int],
]
]:
for warning, lines in self._raw_module_msgs_state.items():
for line, enable in lines.items():
if (
not enable
and (warning, line) not in self._ignored_msgs
and warning not in INCOMPATIBLE_WITH_USELESS_SUPPRESSION
):
yield "useless-suppression", line, (
msgs_store.get_msg_display_string(warning),
)
# don't use iteritems here, _ignored_msgs may be modified by add_message
for (warning, from_), ignored_lines in list(self._ignored_msgs.items()):
for line in ignored_lines:
yield "suppressed-message", line, (
msgs_store.get_msg_display_string(warning),
from_,
)
def get_effective_max_line_number(self) -> int | None:
return self._effective_max_line_number # type: ignore[no-any-return]
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