gh-124960: Fixed `barry_as_FLUFL` future flag does not work in new REPL (#124999)

Co-authored-by: Nice Zombies <nineteendo19d0@gmail.com>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>

Lib/_pyrepl/console.py

@@ -174,7 +174,13 @@ class InteractiveColoredConsole(code.InteractiveConsole):
 
     def runsource(self, source, filename="<input>", symbol="single"):
         try:
-            tree = ast.parse(source)
+            tree = self.compile.compiler(
+                source,
+                filename,
+                "exec",
+                ast.PyCF_ONLY_AST,
+                incomplete_input=False,
+            )
         except (SyntaxError, OverflowError, ValueError):
             self.showsyntaxerror(filename, source=source)
             return False
@@ -185,7 +191,7 @@ class InteractiveColoredConsole(code.InteractiveConsole):
             the_symbol = symbol if stmt is last_stmt else "exec"
             item = wrapper([stmt])
             try:
-                code = self.compile.compiler(item, filename, the_symbol, dont_inherit=True)
+                code = self.compile.compiler(item, filename, the_symbol)
             except SyntaxError as e:
                 if e.args[0] == "'await' outside function":
                     python = os.path.basename(sys.executable)

Lib/codeop.py

@@ -44,6 +44,7 @@ __all__ = ["compile_command", "Compile", "CommandCompiler"]
 # Caveat emptor: These flags are undocumented on purpose and depending
 # on their effect outside the standard library is **unsupported**.
 PyCF_DONT_IMPLY_DEDENT = 0x200
+PyCF_ONLY_AST = 0x400
 PyCF_ALLOW_INCOMPLETE_INPUT = 0x4000
 
 def _maybe_compile(compiler, source, filename, symbol):
@@ -109,12 +110,14 @@ class Compile:
     def __init__(self):
         self.flags = PyCF_DONT_IMPLY_DEDENT | PyCF_ALLOW_INCOMPLETE_INPUT
 
-    def __call__(self, source, filename, symbol, **kwargs):
-        flags = self.flags
+    def __call__(self, source, filename, symbol, flags=0, **kwargs):
+        flags |= self.flags
         if kwargs.get('incomplete_input', True) is False:
             flags &= ~PyCF_DONT_IMPLY_DEDENT
             flags &= ~PyCF_ALLOW_INCOMPLETE_INPUT
         codeob = compile(source, filename, symbol, flags, True)
+        if flags & PyCF_ONLY_AST:
+            return codeob  # this is an ast.Module in this case
         for feature in _features:
             if codeob.co_flags & feature.compiler_flag:
                 self.flags |= feature.compiler_flag

Lib/test/test_pyrepl/test_interact.py

@@ -119,13 +119,38 @@ SyntaxError: duplicate argument 'x' in function definition"""
 
     def test_no_active_future(self):
         console = InteractiveColoredConsole()
-        source = "x: int = 1; print(__annotate__(1))"
+        source = dedent("""\
+        x: int = 1
+        print(__annotate__(1))
+        """)
         f = io.StringIO()
         with contextlib.redirect_stdout(f):
             result = console.runsource(source)
         self.assertFalse(result)
         self.assertEqual(f.getvalue(), "{'x': <class 'int'>}\n")
 
+    def test_future_annotations(self):
+        console = InteractiveColoredConsole()
+        source = dedent("""\
+        from __future__ import annotations
+        def g(x: int): ...
+        print(g.__annotations__)
+        """)
+        f = io.StringIO()
+        with contextlib.redirect_stdout(f):
+            result = console.runsource(source)
+        self.assertFalse(result)
+        self.assertEqual(f.getvalue(), "{'x': 'int'}\n")
+
+    def test_future_barry_as_flufl(self):
+        console = InteractiveColoredConsole()
+        f = io.StringIO()
+        with contextlib.redirect_stdout(f):
+            result = console.runsource("from __future__ import barry_as_FLUFL\n")
+            result = console.runsource("""print("black" <> 'blue')\n""")
+        self.assertFalse(result)
+        self.assertEqual(f.getvalue(), "True\n")
+
 
 class TestMoreLines(unittest.TestCase):
     def test_invalid_syntax_single_line(self):

Misc/NEWS.d/next/Library/2024-10-05-15-49-53.gh-issue-124960.Bol9hT.rst

@@ -0,0 +1 @@
+Fix support for the ``barry_as_FLUFL`` future flag in the new REPL.