gh-119842: Honor PyOS_InputHook in the new REPL

Signed-off-by: Pablo Galindo <pablogsal@gmail.com>

Author: pablogsal

Lib/_pyrepl/reader.py

@@ -24,6 +24,7 @@
 from contextlib import contextmanager
 from dataclasses import dataclass, field, fields
 import unicodedata
+import ctypes
 from _colorize import can_colorize, ANSIColors  # type: ignore[import-not-found]
 
 
@@ -239,6 +240,7 @@ class Reader:
     lxy: tuple[int, int] = field(init=False)
     calc_screen: CalcScreen = field(init=False)
     scheduled_commands: list[str] = field(default_factory=list)
+    input_hook_addr: ctypes.c_void_p | None = None
 
     def __post_init__(self) -> None:
         # Enable the use of `insert` without a `prepare` call - necessary to
@@ -643,6 +645,7 @@ def handle1(self, block: bool = True) -> bool:
             self.dirty = True
 
         while True:
+            self.call_PyOS_InputHook()
             event = self.console.get_event(block)
             if not event:  # can only happen if we're not blocking
                 return False
@@ -701,3 +704,10 @@ def bind(self, spec: KeySpec, command: CommandName) -> None:
     def get_unicode(self) -> str:
         """Return the current buffer as a unicode string."""
         return "".join(self.buffer)
+
+    def call_PyOS_InputHook(self):
+        if self.input_hook_addr is None:
+            self.input_hook_addr = ctypes.c_void_p.in_dll(ctypes.pythonapi, 'PyOS_InputHook').value
+        if not self.input_hook_addr:
+            return
+        ctypes.PYFUNCTYPE(ctypes.c_int)(self.input_hook_addr)()

Lib/test/test_pyrepl/test_reader.py

@@ -1,8 +1,10 @@
 import itertools
 import functools
 from unittest import TestCase
+from unittest.mock import MagicMock
 
 from .support import handle_all_events, handle_events_narrow_console, code_to_events, prepare_reader
+from test.support import import_helper
 from _pyrepl.console import Event
 
 
@@ -176,3 +178,24 @@ def test_newline_within_block_trailing_whitespace(self):
         )
         self.assert_screen_equals(reader, expected)
         self.assertTrue(reader.finished)
+
+    def test_input_hook_is_called_if_set(self):
+        import_helper.import_module('ctypes')
+        from ctypes import pythonapi, c_int, CFUNCTYPE, c_void_p, POINTER, cast
+
+        CMPFUNC = CFUNCTYPE(c_int)
+        the_mock = MagicMock()
+
+        def input_hook():
+            the_mock()
+            return 0
+
+        the_input_hook = CMPFUNC(input_hook)
+        prev_value = c_void_p.in_dll(pythonapi, "PyOS_InputHook").value
+        try:
+            c_void_p.in_dll(pythonapi, "PyOS_InputHook").value =  cast(the_input_hook, c_void_p).value
+            events = code_to_events("a")
+            reader, _ = handle_all_events(events)
+            the_mock.assert_called()
+        finally:
+            c_void_p.in_dll(pythonapi, "PyOS_InputHook").value =  prev_value

Misc/NEWS.d/next/Core and Builtins/2024-05-31-12-06-11.gh-issue-119842.tCGVsv.rst

@@ -0,0 +1 @@
+Honor :c:func:`PyOS_InputHook` in the new REPL. Patch by Pablo Galindo