X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/ced2d656794568517ba9aa28f781f9151d89de54..f95b43d6fa9883a87574f1d69d0a433422c19377:/src/black/parsing.py?ds=sidebyside diff --git a/src/black/parsing.py b/src/black/parsing.py index 76e9de0..70ed99c 100644 --- a/src/black/parsing.py +++ b/src/black/parsing.py @@ -4,34 +4,30 @@ Parse Python code and perform AST validation. import ast import platform import sys -from typing import Any, AnyStr, Iterable, Iterator, List, Set, Tuple, Type, Union +from typing import Any, Iterable, Iterator, List, Set, Tuple, Type, Union if sys.version_info < (3, 8): from typing_extensions import Final else: from typing import Final -# lib2to3 fork -from blib2to3.pytree import Node, Leaf +from black.mode import VERSION_TO_FEATURES, Feature, TargetVersion, supports_feature +from black.nodes import syms from blib2to3 import pygram from blib2to3.pgen2 import driver from blib2to3.pgen2.grammar import Grammar from blib2to3.pgen2.parse import ParseError from blib2to3.pgen2.tokenize import TokenError - -from black.mode import TargetVersion, Feature, supports_feature -from black.nodes import syms +from blib2to3.pytree import Leaf, Node ast3: Any -ast27: Any _IS_PYPY = platform.python_implementation() == "PyPy" try: - from typed_ast import ast3, ast27 + from typed_ast import ast3 except ImportError: - # Either our python version is too low, or we're on pypy - if sys.version_info < (3, 7) or (sys.version_info < (3, 8) and not _IS_PYPY): + if sys.version_info < (3, 8) and not _IS_PYPY: print( "The typed_ast package is required but not installed.\n" "You can upgrade to Python 3.8+ or install typed_ast with\n" @@ -40,12 +36,10 @@ except ImportError: ) sys.exit(1) else: - ast3 = ast27 = ast + ast3 = ast -PY310_HINT: Final[ - str -] = "Consider using --target-version py310 to parse Python 3.10 code." +PY2_HINT: Final = "Python 2 support was removed in version 22.0." class InvalidInput(ValueError): @@ -56,30 +50,15 @@ def get_grammars(target_versions: Set[TargetVersion]) -> List[Grammar]: if not target_versions: # No target_version specified, so try all grammars. return [ - # Python 3.7+ + # Python 3.7-3.9 pygram.python_grammar_no_print_statement_no_exec_statement_async_keywords, # Python 3.0-3.6 pygram.python_grammar_no_print_statement_no_exec_statement, - # Python 2.7 with future print_function import - pygram.python_grammar_no_print_statement, - # Python 2.7 - pygram.python_grammar, - ] - - if all(version.is_python2() for version in target_versions): - # Python 2-only code, so try Python 2 grammars. - return [ - # Python 2.7 with future print_function import - pygram.python_grammar_no_print_statement, - # Python 2.7 - pygram.python_grammar, + # Python 3.10+ + pygram.python_grammar_soft_keywords, ] - # Python 3-compatible code, so only try Python 3 grammar. grammars = [] - if supports_feature(target_versions, Feature.PATTERN_MATCHING): - # Python 3.10+ - grammars.append(pygram.python_grammar_soft_keywords) # If we have to parse both, try to parse async as a keyword first if not supports_feature( target_versions, Feature.ASYNC_IDENTIFIERS @@ -91,6 +70,10 @@ def get_grammars(target_versions: Set[TargetVersion]) -> List[Grammar]: if not supports_feature(target_versions, Feature.ASYNC_KEYWORDS): # Python 3.0-3.6 grammars.append(pygram.python_grammar_no_print_statement_no_exec_statement) + if any(Feature.PATTERN_MATCHING in VERSION_TO_FEATURES[v] for v in target_versions): + # Python 3.10+ + grammars.append(pygram.python_grammar_soft_keywords) + # At least one of the above branches must have been taken, because every Python # version has exactly one of the two 'ASYNC_*' flags return grammars @@ -102,6 +85,7 @@ def lib2to3_parse(src_txt: str, target_versions: Iterable[TargetVersion] = ()) - src_txt += "\n" grammars = get_grammars(set(target_versions)) + errors = {} for grammar in grammars: drv = driver.Driver(grammar) try: @@ -115,20 +99,29 @@ def lib2to3_parse(src_txt: str, target_versions: Iterable[TargetVersion] = ()) - faulty_line = lines[lineno - 1] except IndexError: faulty_line = "" - exc = InvalidInput(f"Cannot parse: {lineno}:{column}: {faulty_line}") + errors[grammar.version] = InvalidInput( + f"Cannot parse: {lineno}:{column}: {faulty_line}" + ) except TokenError as te: # In edge cases these are raised; and typically don't have a "faulty_line". lineno, column = te.args[1] - exc = InvalidInput(f"Cannot parse: {lineno}:{column}: {te.args[0]}") + errors[grammar.version] = InvalidInput( + f"Cannot parse: {lineno}:{column}: {te.args[0]}" + ) else: - if pygram.python_grammar_soft_keywords not in grammars and matches_grammar( - src_txt, pygram.python_grammar_soft_keywords + # Choose the latest version when raising the actual parsing error. + assert len(errors) >= 1 + exc = errors[max(errors)] + + if matches_grammar(src_txt, pygram.python_grammar) or matches_grammar( + src_txt, pygram.python_grammar_no_print_statement ): original_msg = exc.args[0] - msg = f"{original_msg}\n{PY310_HINT}" + msg = f"{original_msg}\n{PY2_HINT}" raise InvalidInput(msg) from None + raise exc from None if isinstance(result, Leaf): @@ -153,57 +146,67 @@ def lib2to3_unparse(node: Node) -> str: def parse_single_version( - src: str, version: Tuple[int, int] -) -> Union[ast.AST, ast3.AST, ast27.AST]: + src: str, version: Tuple[int, int], *, type_comments: bool +) -> Union[ast.AST, ast3.AST]: filename = "" - # typed_ast is needed because of feature version limitations in the builtin ast + # typed-ast is needed because of feature version limitations in the builtin ast 3.8> if sys.version_info >= (3, 8) and version >= (3,): - return ast.parse(src, filename, feature_version=version) - elif version >= (3,): - if _IS_PYPY: - return ast3.parse(src, filename) + return ast.parse( + src, filename, feature_version=version, type_comments=type_comments + ) + + if _IS_PYPY: + # PyPy 3.7 doesn't support type comment tracking which is not ideal, but there's + # not much we can do as typed-ast won't work either. + if sys.version_info >= (3, 8): + return ast3.parse(src, filename, type_comments=type_comments) else: + return ast3.parse(src, filename) + else: + if type_comments: + # Typed-ast is guaranteed to be used here and automatically tracks type + # comments separately. return ast3.parse(src, filename, feature_version=version[1]) - elif version == (2, 7): - return ast27.parse(src) - raise AssertionError("INTERNAL ERROR: Tried parsing unsupported Python version!") + else: + return ast.parse(src, filename) -def parse_ast(src: str) -> Union[ast.AST, ast3.AST, ast27.AST]: +def parse_ast(src: str) -> Union[ast.AST, ast3.AST]: # TODO: support Python 4+ ;) versions = [(3, minor) for minor in range(3, sys.version_info[1] + 1)] - if ast27.__name__ != "ast": - versions.append((2, 7)) - first_error = "" for version in sorted(versions, reverse=True): try: - return parse_single_version(src, version) + return parse_single_version(src, version, type_comments=True) except SyntaxError as e: if not first_error: first_error = str(e) + # Try to parse without type comments + for version in sorted(versions, reverse=True): + try: + return parse_single_version(src, version, type_comments=False) + except SyntaxError: + pass + raise SyntaxError(first_error) ast3_AST: Final[Type[ast3.AST]] = ast3.AST -ast27_AST: Final[Type[ast27.AST]] = ast27.AST -def _normalize(lineend: AnyStr, value: AnyStr) -> AnyStr: +def _normalize(lineend: str, value: str) -> str: # To normalize, we strip any leading and trailing space from # each line... - stripped: List[AnyStr] = [i.strip() for i in value.splitlines()] + stripped: List[str] = [i.strip() for i in value.splitlines()] normalized = lineend.join(stripped) # ...and remove any blank lines at the beginning and end of # the whole string return normalized.strip() -def stringify_ast( - node: Union[ast.AST, ast3.AST, ast27.AST], depth: int = 0 -) -> Iterator[str]: +def stringify_ast(node: Union[ast.AST, ast3.AST], depth: int = 0) -> Iterator[str]: """Simple visitor generating strings to compare ASTs by content.""" node = fixup_ast_constants(node) @@ -215,14 +218,14 @@ def stringify_ast( # TypeIgnore will not be present using pypy < 3.8, so need for this if not (_IS_PYPY and sys.version_info < (3, 8)): # TypeIgnore has only one field 'lineno' which breaks this comparison - type_ignore_classes = (ast3.TypeIgnore, ast27.TypeIgnore) + type_ignore_classes = (ast3.TypeIgnore,) if sys.version_info >= (3, 8): type_ignore_classes += (ast.TypeIgnore,) if isinstance(node, type_ignore_classes): break try: - value = getattr(node, field) + value: object = getattr(node, field) except AttributeError: continue @@ -234,40 +237,35 @@ def stringify_ast( # parentheses and they change the AST. if ( field == "targets" - and isinstance(node, (ast.Delete, ast3.Delete, ast27.Delete)) - and isinstance(item, (ast.Tuple, ast3.Tuple, ast27.Tuple)) + and isinstance(node, (ast.Delete, ast3.Delete)) + and isinstance(item, (ast.Tuple, ast3.Tuple)) ): - for item in item.elts: - yield from stringify_ast(item, depth + 2) + for elt in item.elts: + yield from stringify_ast(elt, depth + 2) - elif isinstance(item, (ast.AST, ast3.AST, ast27.AST)): + elif isinstance(item, (ast.AST, ast3.AST)): yield from stringify_ast(item, depth + 2) # Note that we are referencing the typed-ast ASTs via global variables and not # direct module attribute accesses because that breaks mypyc. It's probably - # something to do with the ast3 / ast27 variables being marked as Any leading + # something to do with the ast3 variables being marked as Any leading # mypy to think this branch is always taken, leaving the rest of the code # unanalyzed. Tighting up the types for the typed-ast AST types avoids the # mypyc crash. - elif isinstance(value, (ast.AST, ast3_AST, ast27_AST)): + elif isinstance(value, (ast.AST, ast3_AST)): yield from stringify_ast(value, depth + 2) else: + normalized: object # Constant strings may be indented across newlines, if they are # docstrings; fold spaces after newlines when comparing. Similarly, # trailing and leading space may be removed. - # Note that when formatting Python 2 code, at least with Windows - # line-endings, docstrings can end up here as bytes instead of - # str so make sure that we handle both cases. if ( isinstance(node, ast.Constant) and field == "value" - and isinstance(value, (str, bytes)) + and isinstance(value, str) ): - if isinstance(value, str): - normalized: Union[str, bytes] = _normalize("\n", value) - else: - normalized = _normalize(b"\n", value) + normalized = _normalize("\n", value) else: normalized = value yield f"{' ' * (depth+2)}{normalized!r}, # {value.__class__.__name__}" @@ -275,14 +273,12 @@ def stringify_ast( yield f"{' ' * depth}) # /{node.__class__.__name__}" -def fixup_ast_constants( - node: Union[ast.AST, ast3.AST, ast27.AST] -) -> Union[ast.AST, ast3.AST, ast27.AST]: +def fixup_ast_constants(node: Union[ast.AST, ast3.AST]) -> Union[ast.AST, ast3.AST]: """Map ast nodes deprecated in 3.8 to Constant.""" - if isinstance(node, (ast.Str, ast3.Str, ast27.Str, ast.Bytes, ast3.Bytes)): + if isinstance(node, (ast.Str, ast3.Str, ast.Bytes, ast3.Bytes)): return ast.Constant(value=node.s) - if isinstance(node, (ast.Num, ast3.Num, ast27.Num)): + if isinstance(node, (ast.Num, ast3.Num)): return ast.Constant(value=node.n) if isinstance(node, (ast.NameConstant, ast3.NameConstant)):