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processor.py
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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:]