Initial commit

venv/lib/python3.8/site-packages/astroid/_ast.py

@@ -0,0 +1,54 @@
+import ast
+from collections import namedtuple
+from functools import partial
+from typing import Optional
+import sys
+
+_ast_py2 = _ast_py3 = None
+try:
+    import typed_ast.ast3 as _ast_py3
+    import typed_ast.ast27 as _ast_py2
+except ImportError:
+    pass
+
+
+PY38 = sys.version_info[:2] >= (3, 8)
+if PY38:
+    # On Python 3.8, typed_ast was merged back into `ast`
+    _ast_py3 = ast
+
+
+FunctionType = namedtuple("FunctionType", ["argtypes", "returns"])
+
+
+def _get_parser_module(parse_python_two=False, type_comments_support=True):
+    if not type_comments_support:
+        return ast
+
+    if parse_python_two:
+        parser_module = _ast_py2
+    else:
+        parser_module = _ast_py3
+    return parser_module or ast
+
+
+def _parse(string: str, parse_python_two=False, type_comments=True):
+    parse_module = _get_parser_module(
+        parse_python_two=parse_python_two, type_comments_support=type_comments
+    )
+    parse_func = parse_module.parse
+    if parse_module is _ast_py3:
+        if PY38:
+            parse_func = partial(parse_func, type_comments=type_comments)
+        if not parse_python_two:
+            parse_func = partial(parse_func, feature_version=sys.version_info.minor)
+    return parse_func(string)
+
+
+def parse_function_type_comment(type_comment: str) -> Optional[FunctionType]:
+    """Given a correct type comment, obtain a FunctionType object"""
+    if _ast_py3 is None:
+        return None
+
+    func_type = _ast_py3.parse(type_comment, "<type_comment>", "func_type")
+    return FunctionType(argtypes=func_type.argtypes, returns=func_type.returns)