[pre-commit.ci] pre-commit autoupdate (#3915)

[etc/vim.git] / src / black / parsing.py

diff --git a/src/black/parsing.py b/src/black/parsing.py
index d1ad7d2c671a605d5a8745f39f47de355ae22cae..e98e019cac6e9a1955f91cc35553a1b7393951dd 100644 (file)
--- a/src/black/parsing.py
+++ b/src/black/parsing.py
@@ -2,45 +2,17 @@
 Parse Python code and perform AST validation.
 """
 import ast
 Parse Python code and perform AST validation.
 """
 import ast

-import platform

 import sys
 import sys

-from typing import Any, Iterable, Iterator, List, Set, Tuple, Type, Union
+from typing import Final, Iterable, Iterator, List, Set, Tuple

 
 

-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 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
-
-ast3: Any
-
-_IS_PYPY = platform.python_implementation() == "PyPy"
-
-try:
-    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):
-        print(
-            "The typed_ast package is required but not installed.\n"
-            "You can upgrade to Python 3.8+ or install typed_ast with\n"
-            "`python3 -m pip install typed-ast`.",
-            file=sys.stderr,
-        )
-        sys.exit(1)
-    else:
-        ast3 = ast
-
+from blib2to3.pytree import Leaf, Node

 
 PY2_HINT: Final = "Python 2 support was removed in version 22.0."
 
 
 PY2_HINT: Final = "Python 2 support was removed in version 22.0."
 


@@ -53,7 +25,7 @@ def get_grammars(target_versions: Set[TargetVersion]) -> List[Grammar]:
     if not target_versions:
         # No target_version specified, so try all grammars.
         return [
     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,
             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,


@@ -73,7 +45,7 @@ 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 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 supports_feature(target_versions, Feature.PATTERN_MATCHING):
+    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)
 
         # Python 3.10+
         grammars.append(pygram.python_grammar_soft_keywords)
 


@@ -149,44 +121,34 @@ def lib2to3_unparse(node: Node) -> str:
 
 
 def parse_single_version(
 
 
 def parse_single_version(

-    src: str, version: Tuple[int, int]
-) -> Union[ast.AST, ast3.AST]:
+    src: str, version: Tuple[int, int], *, type_comments: bool
+) -> ast.AST:

     filename = "<unknown>"
     filename = "<unknown>"

-    # 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, type_comments=True)
-
-    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=True)
-        else:
-            return ast3.parse(src, filename)
-    else:
-        # Typed-ast is guaranteed to be used here and automatically tracks type
-        # comments separately.
-        return ast3.parse(src, filename, feature_version=version[1])
+    return ast.parse(
+        src, filename, feature_version=version, type_comments=type_comments
+    )

 
 

-    raise AssertionError("INTERNAL ERROR: Tried parsing unsupported Python version!")

 
 

-
-def parse_ast(src: str) -> Union[ast.AST, ast3.AST]:
+def parse_ast(src: str) -> ast.AST:

     # TODO: support Python 4+ ;)
     versions = [(3, minor) for minor in range(3, sys.version_info[1] + 1)]
 
     first_error = ""
     for version in sorted(versions, reverse=True):
         try:
     # TODO: support Python 4+ ;)
     versions = [(3, minor) for minor in range(3, sys.version_info[1] + 1)]
 
     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)
 
         except SyntaxError as e:
             if not first_error:
                 first_error = str(e)
 

-    raise SyntaxError(first_error)
-
+    # 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

 
 

-ast3_AST: Final[Type[ast3.AST]] = ast3.AST
+    raise SyntaxError(first_error)

 
 
 def _normalize(lineend: str, value: str) -> str:
 
 
 def _normalize(lineend: str, value: str) -> str:


@@ -199,23 +161,25 @@ def _normalize(lineend: str, value: str) -> str:
     return normalized.strip()
 
 
     return normalized.strip()
 
 

-def stringify_ast(node: Union[ast.AST, ast3.AST], depth: int = 0) -> Iterator[str]:
+def stringify_ast(node: ast.AST, depth: int = 0) -> Iterator[str]:

     """Simple visitor generating strings to compare ASTs by content."""
 
     """Simple visitor generating strings to compare ASTs by content."""
 

-    node = fixup_ast_constants(node)
+    if (
+        isinstance(node, ast.Constant)
+        and isinstance(node.value, str)
+        and node.kind == "u"
+    ):
+        # It's a quirk of history that we strip the u prefix over here. We used to
+        # rewrite the AST nodes for Python version compatibility and we never copied
+        # over the kind
+        node.kind = None

 
     yield f"{'  ' * depth}{node.__class__.__name__}("
 
 
     yield f"{'  ' * depth}{node.__class__.__name__}("
 

-    type_ignore_classes: Tuple[Type[Any], ...]

     for field in sorted(node._fields):  # noqa: F402
     for field in sorted(node._fields):  # noqa: F402

-        # 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,)
-            if sys.version_info >= (3, 8):
-                type_ignore_classes += (ast.TypeIgnore,)
-            if isinstance(node, type_ignore_classes):
-                break
+        # TypeIgnore has only one field 'lineno' which breaks this comparison
+        if isinstance(node, ast.TypeIgnore):
+            break

 
         try:
             value: object = getattr(node, field)
 
         try:
             value: object = getattr(node, field)


@@ -230,51 +194,34 @@ def stringify_ast(node: Union[ast.AST, ast3.AST], depth: int = 0) -> Iterator[st
                 # parentheses and they change the AST.
                 if (
                     field == "targets"
                 # parentheses and they change the AST.
                 if (
                     field == "targets"

-                    and isinstance(node, (ast.Delete, ast3.Delete))
-                    and isinstance(item, (ast.Tuple, ast3.Tuple))
+                    and isinstance(node, ast.Delete)
+                    and isinstance(item, ast.Tuple)

                 ):
                     for elt in item.elts:
                         yield from stringify_ast(elt, depth + 2)
 
                 ):
                     for elt in item.elts:
                         yield from stringify_ast(elt, depth + 2)
 

-                elif isinstance(item, (ast.AST, ast3.AST)):
+                elif isinstance(item, ast.AST):

                     yield from stringify_ast(item, depth + 2)
 
                     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 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)):
+        elif isinstance(value, ast.AST):

             yield from stringify_ast(value, depth + 2)
 
         else:
             normalized: object
             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.

             if (
                 isinstance(node, ast.Constant)
                 and field == "value"
                 and isinstance(value, str)
             ):
             if (
                 isinstance(node, ast.Constant)
                 and field == "value"
                 and isinstance(value, str)
             ):

+                # 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.

                 normalized = _normalize("\n", value)
                 normalized = _normalize("\n", value)

+            elif field == "type_comment" and isinstance(value, str):
+                # Trailing whitespace in type comments is removed.
+                normalized = value.rstrip()

             else:
                 normalized = value
             yield f"{'  ' * (depth+2)}{normalized!r},  # {value.__class__.__name__}"
 
     yield f"{'  ' * depth})  # /{node.__class__.__name__}"
             else:
                 normalized = value
             yield f"{'  ' * (depth+2)}{normalized!r},  # {value.__class__.__name__}"
 
     yield f"{'  ' * depth})  # /{node.__class__.__name__}"

-
-
-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, ast.Bytes, ast3.Bytes)):
-        return ast.Constant(value=node.s)
-
-    if isinstance(node, (ast.Num, ast3.Num)):
-        return ast.Constant(value=node.n)
-
-    if isinstance(node, (ast.NameConstant, ast3.NameConstant)):
-        return ast.Constant(value=node.value)
-
-    return node