X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/866be066463fc8fd01c16559596641f6ead1e797..448885b256ca1741fda7c4ef17f80f750ea614c0:/black.py

diff --git a/black.py b/black.py
index 9494c4c..17aea7a 100644
--- a/black.py
+++ b/black.py
@@ -136,19 +136,28 @@ class Feature(Enum):
     NUMERIC_UNDERSCORES = 3
     TRAILING_COMMA_IN_CALL = 4
     TRAILING_COMMA_IN_DEF = 5
+    # The following two feature-flags are mutually exclusive, and exactly one should be
+    # set for every version of python.
+    ASYNC_IDENTIFIERS = 6
+    ASYNC_KEYWORDS = 7
 
 
 VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
-    TargetVersion.PY27: set(),
-    TargetVersion.PY33: {Feature.UNICODE_LITERALS},
-    TargetVersion.PY34: {Feature.UNICODE_LITERALS},
-    TargetVersion.PY35: {Feature.UNICODE_LITERALS, Feature.TRAILING_COMMA_IN_CALL},
+    TargetVersion.PY27: {Feature.ASYNC_IDENTIFIERS},
+    TargetVersion.PY33: {Feature.UNICODE_LITERALS, Feature.ASYNC_IDENTIFIERS},
+    TargetVersion.PY34: {Feature.UNICODE_LITERALS, Feature.ASYNC_IDENTIFIERS},
+    TargetVersion.PY35: {
+        Feature.UNICODE_LITERALS,
+        Feature.TRAILING_COMMA_IN_CALL,
+        Feature.ASYNC_IDENTIFIERS,
+    },
     TargetVersion.PY36: {
         Feature.UNICODE_LITERALS,
         Feature.F_STRINGS,
         Feature.NUMERIC_UNDERSCORES,
         Feature.TRAILING_COMMA_IN_CALL,
         Feature.TRAILING_COMMA_IN_DEF,
+        Feature.ASYNC_IDENTIFIERS,
     },
     TargetVersion.PY37: {
         Feature.UNICODE_LITERALS,
@@ -156,6 +165,7 @@ VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
         Feature.NUMERIC_UNDERSCORES,
         Feature.TRAILING_COMMA_IN_CALL,
         Feature.TRAILING_COMMA_IN_DEF,
+        Feature.ASYNC_KEYWORDS,
     },
     TargetVersion.PY38: {
         Feature.UNICODE_LITERALS,
@@ -163,6 +173,7 @@ VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
         Feature.NUMERIC_UNDERSCORES,
         Feature.TRAILING_COMMA_IN_CALL,
         Feature.TRAILING_COMMA_IN_DEF,
+        Feature.ASYNC_KEYWORDS,
     },
 }
 
@@ -752,16 +763,38 @@ 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+
+            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,
         ]
     elif all(version.is_python2() for version in target_versions):
         # Python 2-only code, so try Python 2 grammars.
-        return [pygram.python_grammar_no_print_statement, pygram.python_grammar]
+        return [
+            # Python 2.7 with future print_function import
+            pygram.python_grammar_no_print_statement,
+            # Python 2.7
+            pygram.python_grammar,
+        ]
     else:
         # Python 3-compatible code, so only try Python 3 grammar.
-        return [pygram.python_grammar_no_print_statement_no_exec_statement]
+        grammars = []
+        # If we have to parse both, try to parse async as a keyword first
+        if not supports_feature(target_versions, Feature.ASYNC_IDENTIFIERS):
+            # Python 3.7+
+            grammars.append(
+                pygram.python_grammar_no_print_statement_no_exec_statement_async_keywords  # noqa: B950
+            )
+        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)
+        # 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
 
 
 def lib2to3_parse(src_txt: str, target_versions: Iterable[TargetVersion] = ()) -> Node:
@@ -3382,10 +3415,13 @@ class Report:
 
 
 def parse_ast(src: str) -> Union[ast3.AST, ast27.AST]:
-    try:
-        return ast3.parse(src)
-    except SyntaxError:
-        return ast27.parse(src)
+    for feature_version in (7, 6):
+        try:
+            return ast3.parse(src, feature_version=feature_version)
+        except SyntaxError:
+            continue
+
+    return ast27.parse(src)
 
 
 def assert_equivalent(src: str, dst: str) -> None:
@@ -3438,11 +3474,9 @@ def assert_equivalent(src: str, dst: str) -> None:
     try:
         src_ast = parse_ast(src)
     except Exception as exc:
-        major, minor = sys.version_info[:2]
         raise AssertionError(
-            f"cannot use --safe with this file; failed to parse source file "
-            f"with Python {major}.{minor}'s builtin AST. Re-run with --fast "
-            f"or stop using deprecated Python 2 syntax. AST error message: {exc}"
+            f"cannot use --safe with this file; failed to parse source file.  "
+            f"AST error message: {exc}"
         )
 
     try: