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"""Module containing our file processor that tokenizes a file for checks."""
import argparse
import ast
import contextlib
import logging
import tokenize
from typing import Any
from typing import Dict
from typing import Generator
from typing import List
from typing import Optional
from typing import Tuple
from flake8 import defaults
from flake8 import utils
from flake8.plugins.finder import LoadedPlugin
LOG = logging.getLogger(__name__)
NEWLINE = frozenset([tokenize.NL, tokenize.NEWLINE])
SKIP_TOKENS = frozenset(
[tokenize.NL, tokenize.NEWLINE, tokenize.INDENT, tokenize.DEDENT]
)
_LogicalMapping = List[Tuple[int, Tuple[int, int]]]
_Logical = Tuple[List[str], List[str], _LogicalMapping]
class FileProcessor:
"""Processes a file and holdes state.
This processes a file by generating tokens, logical and physical lines,
and AST trees. This also provides a way of passing state about the file
to checks expecting that state. Any public attribute on this object can
be requested by a plugin. The known public attributes are:
- :attr:`blank_before`
- :attr:`blank_lines`
- :attr:`checker_state`
- :attr:`indent_char`
- :attr:`indent_level`
- :attr:`line_number`
- :attr:`logical_line`
- :attr:`max_line_length`
- :attr:`max_doc_length`
- :attr:`multiline`
- :attr:`noqa`
- :attr:`previous_indent_level`
- :attr:`previous_logical`
- :attr:`previous_unindented_logical_line`
- :attr:`tokens`
- :attr:`file_tokens`
- :attr:`total_lines`
- :attr:`verbose`
"""
#: always ``False``, included for compatibility
noqa = False
def __init__(
self,
filename: str,
options: argparse.Namespace,
lines: Optional[List[str]] = None,
) -> None:
"""Initialice our file processor.
:param filename: Name of the file to process
"""
self.options = options
self.filename = filename
self.lines = lines if lines is not None else self.read_lines()
self.strip_utf_bom()
# Defaults for public attributes
#: Number of preceding blank lines
self.blank_before = 0
#: Number of blank lines
self.blank_lines = 0
#: Checker states for each plugin?
self._checker_states: Dict[str, Dict[Any, Any]] = {}
#: Current checker state
self.checker_state: Dict[Any, Any] = {}
#: User provided option for hang closing
self.hang_closing = options.hang_closing
#: Character used for indentation
self.indent_char: Optional[str] = None
#: Current level of indentation
self.indent_level = 0
#: Number of spaces used for indentation
self.indent_size = options.indent_size
#: Line number in the file
self.line_number = 0
#: Current logical line
self.logical_line = ""
#: Maximum line length as configured by the user
self.max_line_length = options.max_line_length
#: Maximum docstring / comment line length as configured by the user
self.max_doc_length = options.max_doc_length
#: Whether the current physical line is multiline
self.multiline = False
#: Previous level of indentation
self.previous_indent_level = 0
#: Previous logical line
self.previous_logical = ""
#: Previous unindented (i.e. top-level) logical line
self.previous_unindented_logical_line = ""
#: Current set of tokens
self.tokens: List[tokenize.TokenInfo] = []
#: Total number of lines in the file
self.total_lines = len(self.lines)
#: Verbosity level of Flake8
self.verbose = options.verbose
#: Statistics dictionary
self.statistics = {"logical lines": 0}
self._file_tokens: Optional[List[tokenize.TokenInfo]] = None
# map from line number to the line we'll search for `noqa` in
self._noqa_line_mapping: Optional[Dict[int, str]] = None
@property
def file_tokens(self) -> List[tokenize.TokenInfo]:
"""Return the complete set of tokens for a file."""
if self._file_tokens is None:
line_iter = iter(self.lines)
self._file_tokens = list(
tokenize.generate_tokens(lambda: next(line_iter))
)
return self._file_tokens
@contextlib.contextmanager
def inside_multiline(
self, line_number: int
) -> Generator[None, None, None]:
"""Context-manager to toggle the multiline attribute."""
self.line_number = line_number
self.multiline = True
yield
self.multiline = False
def reset_blank_before(self) -> None:
"""Reset the blank_before attribute to zero."""
self.blank_before = 0
def delete_first_token(self) -> None:
"""Delete the first token in the list of tokens."""
del self.tokens[0]
def visited_new_blank_line(self) -> None:
"""Note that we visited a new blank line."""
self.blank_lines += 1
def update_state(self, mapping: _LogicalMapping) -> None:
"""Update the indent level based on the logical line mapping."""
(start_row, start_col) = mapping[0][1]
start_line = self.lines[start_row - 1]
self.indent_level = expand_indent(start_line[:start_col])
if self.blank_before < self.blank_lines:
self.blank_before = self.blank_lines
def update_checker_state_for(self, plugin: LoadedPlugin) -> None:
"""Update the checker_state attribute for the plugin."""
if "checker_state" in plugin.parameters:
self.checker_state = self._checker_states.setdefault(
plugin.entry_name, {}
)
def next_logical_line(self) -> None:
"""Record the previous logical line.
This also resets the tokens list and the blank_lines count.
"""
if self.logical_line:
self.previous_indent_level = self.indent_level
self.previous_logical = self.logical_line
if not self.indent_level:
self.previous_unindented_logical_line = self.logical_line
self.blank_lines = 0
self.tokens = []
def build_logical_line_tokens(self) -> _Logical:
"""Build the mapping, comments, and logical line lists."""
logical = []
comments = []
mapping: _LogicalMapping = []
length = 0
previous_row = previous_column = None
for token_type, text, start, end, line in self.tokens:
if token_type in SKIP_TOKENS:
continue
if not mapping:
mapping = [(0, start)]
if token_type == tokenize.COMMENT:
comments.append(text)
continue
if token_type == tokenize.STRING:
text = mutate_string(text)
if previous_row:
(start_row, start_column) = start
if previous_row != start_row:
row_index = previous_row - 1
column_index = previous_column - 1
previous_text = self.lines[row_index][column_index]
if previous_text == "," or (
previous_text not in "{[(" and text not in "}])"
):
text = f" {text}"
elif previous_column != start_column:
text = line[previous_column:start_column] + text
logical.append(text)
length += len(text)
mapping.append((length, end))
(previous_row, previous_column) = end
return comments, logical, mapping
def build_ast(self) -> ast.AST:
"""Build an abstract syntax tree from the list of lines."""
return ast.parse("".join(self.lines))
def build_logical_line(self) -> Tuple[str, str, _LogicalMapping]:
"""Build a logical line from the current tokens list."""
comments, logical, mapping_list = self.build_logical_line_tokens()
joined_comments = "".join(comments)
self.logical_line = "".join(logical)
self.statistics["logical lines"] += 1
return joined_comments, self.logical_line, mapping_list
def split_line(
self, token: tokenize.TokenInfo
) -> Generator[str, None, None]:
"""Split a physical line's line based on new-lines.
This also auto-increments the line number for the caller.
"""
# intentionally don't include the last line, that line will be
# terminated later by a future end-of-line
for line_no in range(token.start[0], token.end[0]):
yield self.lines[line_no - 1]
self.line_number += 1
def keyword_arguments_for(
self,
parameters: Dict[str, bool],
arguments: Dict[str, Any],
) -> Dict[str, Any]:
"""Generate the keyword arguments for a list of parameters."""
ret = {}
for param, required in parameters.items():
if param in arguments:
continue
try:
ret[param] = getattr(self, param)
except AttributeError:
if required:
raise
else:
LOG.warning(
'Plugin requested optional parameter "%s" '
"but this is not an available parameter.",
param,
)
return ret
def generate_tokens(self) -> Generator[tokenize.TokenInfo, None, None]:
"""Tokenize the file and yield the tokens."""
for token in tokenize.generate_tokens(self.next_line):
if token[2][0] > self.total_lines:
break
self.tokens.append(token)
yield token
def _noqa_line_range(self, min_line: int, max_line: int) -> Dict[int, str]:
line_range = range(min_line, max_line + 1)
joined = "".join(self.lines[min_line - 1 : max_line])
return dict.fromkeys(line_range, joined)
def noqa_line_for(self, line_number: int) -> Optional[str]:
"""Retrieve the line which will be used to determine noqa."""
if self._noqa_line_mapping is None:
try:
file_tokens = self.file_tokens
except (tokenize.TokenError, SyntaxError):
# if we failed to parse the file tokens, we'll always fail in
# the future, so set this so the code does not try again
self._noqa_line_mapping = {}
else:
ret = {}
min_line = len(self.lines) + 2
max_line = -1
for tp, _, (s_line, _), (e_line, _), _ in file_tokens:
if tp == tokenize.ENDMARKER:
break
min_line = min(min_line, s_line)
max_line = max(max_line, e_line)
if tp in (tokenize.NL, tokenize.NEWLINE):
ret.update(self._noqa_line_range(min_line, max_line))
min_line = len(self.lines) + 2
max_line = -1
# in newer versions of python, a `NEWLINE` token is inserted
# at the end of the file even if it doesn't have one.
# on old pythons, they will not have hit a `NEWLINE`
if max_line != -1:
ret.update(self._noqa_line_range(min_line, max_line))
self._noqa_line_mapping = ret
# NOTE(sigmavirus24): Some plugins choose to report errors for empty
# files on Line 1. In those cases, we shouldn't bother trying to
# retrieve a physical line (since none exist).
return self._noqa_line_mapping.get(line_number)
def next_line(self) -> str:
"""Get the next line from the list."""
if self.line_number >= self.total_lines:
return ""
line = self.lines[self.line_number]
self.line_number += 1
if self.indent_char is None and line[:1] in defaults.WHITESPACE:
self.indent_char = line[0]
return line
def read_lines(self) -> List[str]:
"""Read the lines for this file checker."""
if self.filename is None or self.filename == "-":
self.filename = self.options.stdin_display_name or "stdin"
lines = self.read_lines_from_stdin()
else:
lines = self.read_lines_from_filename()
return lines
def read_lines_from_filename(self) -> List[str]:
"""Read the lines for a file."""
try:
with tokenize.open(self.filename) as fd:
return fd.readlines()
except (SyntaxError, UnicodeError):
# If we can't detect the codec with tokenize.detect_encoding, or
# the detected encoding is incorrect, just fallback to latin-1.
with open(self.filename, encoding="latin-1") as fd:
return fd.readlines()
def read_lines_from_stdin(self) -> List[str]:
"""Read the lines from standard in."""
return utils.stdin_get_lines()
def should_ignore_file(self) -> bool:
"""Check if ``flake8: noqa`` is in the file to be ignored.
:returns:
True if a line matches :attr:`defaults.NOQA_FILE`,
otherwise False
"""
if not self.options.disable_noqa and any(
defaults.NOQA_FILE.match(line) for line in self.lines
):
return True
elif any(defaults.NOQA_FILE.search(line) for line in self.lines):
LOG.warning(
"Detected `flake8: noqa` on line with code. To ignore an "
"error on a line use `noqa` instead."
)
return False
else:
return False
def strip_utf_bom(self) -> None:
"""Strip the UTF bom from the lines of the file."""
if not self.lines:
# If we have nothing to analyze quit early
return
first_byte = ord(self.lines[0][0])
if first_byte not in (0xEF, 0xFEFF):
return
# If the first byte of the file is a UTF-8 BOM, strip it
if first_byte == 0xFEFF:
self.lines[0] = self.lines[0][1:]
elif self.lines[0][:3] == "\xEF\xBB\xBF":
self.lines[0] = self.lines[0][3:]
def is_eol_token(token: tokenize.TokenInfo) -> bool:
"""Check if the token is an end-of-line token."""
return token[0] in NEWLINE or token[4][token[3][1] :].lstrip() == "\\\n"
def is_multiline_string(token: tokenize.TokenInfo) -> bool:
"""Check if this is a multiline string."""
return token[0] == tokenize.STRING and "\n" in token[1]
def token_is_newline(token: tokenize.TokenInfo) -> bool:
"""Check if the token type is a newline token type."""
return token[0] in NEWLINE
def count_parentheses(current_parentheses_count: int, token_text: str) -> int:
"""Count the number of parentheses."""
if token_text in "([{": # nosec
return current_parentheses_count + 1
elif token_text in "}])": # nosec
return current_parentheses_count - 1
return current_parentheses_count
def expand_indent(line: str) -> int:
r"""Return the amount of indentation.
Tabs are expanded to the next multiple of 8.
>>> expand_indent(' ')
4
>>> expand_indent('\t')
8
>>> expand_indent(' \t')
8
>>> expand_indent(' \t')
16
"""
return len(line.expandtabs(8))
# NOTE(sigmavirus24): This was taken wholesale from
# https://github.com/PyCQA/pycodestyle. The in-line comments were edited to be
# more descriptive.
def mutate_string(text: str) -> str:
"""Replace contents with 'xxx' to prevent syntax matching.
>>> mutate_string('"abc"')
'"xxx"'
>>> mutate_string("'''abc'''")
"'''xxx'''"
>>> mutate_string("r'abc'")
"r'xxx'"
"""
# NOTE(sigmavirus24): If there are string modifiers (e.g., b, u, r)
# use the last "character" to determine if we're using single or double
# quotes and then find the first instance of it
start = text.index(text[-1]) + 1
end = len(text) - 1
# Check for triple-quoted strings
if text[-3:] in ('"""', "'''"):
start += 2
end -= 2
return text[:start] + "x" * (end - start) + text[end:]
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