cpython/Lib/test/test_pyrepl/test_pyrepl.py

import importlib
import io
import itertools
import os
import pathlib
import re
import rlcompleter
import select
import subprocess
import sys
import tempfile
from pkgutil import ModuleInfo
from unittest import TestCase, skipUnless, skipIf, SkipTest
from unittest.mock import patch
from test.support import force_not_colorized, make_clean_env, Py_DEBUG
from test.support import has_subprocess_support, SHORT_TIMEOUT, STDLIB_DIR
from test.support.import_helper import import_module
from test.support.os_helper import EnvironmentVarGuard, unlink

from .support import (
    FakeConsole,
    ScreenEqualMixin,
    handle_all_events,
    handle_events_narrow_console,
    more_lines,
    multiline_input,
    code_to_events,
)
from _pyrepl.console import Event
from _pyrepl._module_completer import (
    ImportParser,
    ModuleCompleter,
    HARDCODED_SUBMODULES,
)
from _pyrepl.readline import (
    ReadlineAlikeReader,
    ReadlineConfig,
    _ReadlineWrapper,
)
from _pyrepl.readline import multiline_input as readline_multiline_input

try:
    import pty
except ImportError:
    pty = None


class ReplTestCase(TestCase):
    def setUp(self):
        if not has_subprocess_support:
            raise SkipTest("test module requires subprocess")

    def run_repl(
        self,
        repl_input: str | list[str],
        env: dict | None = None,
        *,
        cmdline_args: list[str] | None = None,
        cwd: str | None = None,
        skip: bool = False,
        timeout: float = SHORT_TIMEOUT,
        exit_on_output: str | None = None,
    ) -> tuple[str, int]:
        temp_dir = None
        if cwd is None:
            temp_dir = tempfile.TemporaryDirectory(ignore_cleanup_errors=True)
            cwd = temp_dir.name
        try:
            return self._run_repl(
                repl_input,
                env=env,
                cmdline_args=cmdline_args,
                cwd=cwd,
                skip=skip,
                timeout=timeout,
                exit_on_output=exit_on_output,
            )
        finally:
            if temp_dir is not None:
                temp_dir.cleanup()

    def _run_repl(
        self,
        repl_input: str | list[str],
        *,
        env: dict | None,
        cmdline_args: list[str] | None,
        cwd: str,
        skip: bool,
        timeout: float,
        exit_on_output: str | None,
    ) -> tuple[str, int]:
        assert pty
        master_fd, slave_fd = pty.openpty()
        cmd = [sys.executable, "-i", "-u"]
        if env is None:
            cmd.append("-I")
        elif "PYTHON_HISTORY" not in env:
            env["PYTHON_HISTORY"] = os.path.join(cwd, ".regrtest_history")
        if cmdline_args is not None:
            cmd.extend(cmdline_args)

        try:
            import termios
        except ModuleNotFoundError:
            pass
        else:
            term_attr = termios.tcgetattr(slave_fd)
            term_attr[6][termios.VREPRINT] = 0  # pass through CTRL-R
            term_attr[6][termios.VINTR] = 0  # pass through CTRL-C
            termios.tcsetattr(slave_fd, termios.TCSANOW, term_attr)

        process = subprocess.Popen(
            cmd,
            stdin=slave_fd,
            stdout=slave_fd,
            stderr=slave_fd,
            cwd=cwd,
            text=True,
            close_fds=True,
            env=env if env else os.environ,
        )
        os.close(slave_fd)
        if isinstance(repl_input, list):
            repl_input = "\n".join(repl_input) + "\n"
        os.write(master_fd, repl_input.encode("utf-8"))

        output = []
        while select.select([master_fd], [], [], timeout)[0]:
            try:
                data = os.read(master_fd, 1024).decode("utf-8")
                if not data:
                    break
            except OSError:
                break
            output.append(data)
            if exit_on_output is not None:
                output = ["".join(output)]
                if exit_on_output in output[0]:
                    process.kill()
                    break
        else:
            os.close(master_fd)
            process.kill()
            process.wait(timeout=timeout)
            self.fail(f"Timeout while waiting for output, got: {''.join(output)}")

        os.close(master_fd)
        try:
            exit_code = process.wait(timeout=timeout)
        except subprocess.TimeoutExpired:
            process.kill()
            exit_code = process.wait()
        output = "".join(output)
        if skip and "can't use pyrepl" in output:
            self.skipTest("pyrepl not available")
        return output, exit_code


class TestCursorPosition(TestCase):
    def prepare_reader(self, events):
        console = FakeConsole(events)
        config = ReadlineConfig(readline_completer=None)
        reader = ReadlineAlikeReader(console=console, config=config)
        return reader

    def test_up_arrow_simple(self):
        # fmt: off
        code = (
            "def f():\n"
            "  ...\n"
        )
        # fmt: on
        events = itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
            ],
        )

        reader, console = handle_all_events(events)
        self.assertEqual(reader.cxy, (0, 1))
        console.move_cursor.assert_called_once_with(0, 1)

    def test_down_arrow_end_of_input(self):
        # fmt: off
        code = (
            "def f():\n"
            "  ...\n"
        )
        # fmt: on
        events = itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
            ],
        )

        reader, console = handle_all_events(events)
        self.assertEqual(reader.cxy, (0, 2))
        console.move_cursor.assert_called_once_with(0, 2)

    def test_left_arrow_simple(self):
        events = itertools.chain(
            code_to_events("11+11"),
            [
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
            ],
        )

        reader, console = handle_all_events(events)
        self.assertEqual(reader.cxy, (4, 0))
        console.move_cursor.assert_called_once_with(4, 0)

    def test_right_arrow_end_of_line(self):
        events = itertools.chain(
            code_to_events("11+11"),
            [
                Event(evt="key", data="right", raw=bytearray(b"\x1bOC")),
            ],
        )

        reader, console = handle_all_events(events)
        self.assertEqual(reader.cxy, (5, 0))
        console.move_cursor.assert_called_once_with(5, 0)

    def test_cursor_position_simple_character(self):
        events = itertools.chain(code_to_events("k"))

        reader, _ = handle_all_events(events)
        self.assertEqual(reader.pos, 1)

        # 1 for simple character
        self.assertEqual(reader.cxy, (1, 0))

    def test_cursor_position_double_width_character(self):
        events = itertools.chain(code_to_events("樂"))

        reader, _ = handle_all_events(events)
        self.assertEqual(reader.pos, 1)

        # 2 for wide character
        self.assertEqual(reader.cxy, (2, 0))

    def test_cursor_position_double_width_character_move_left(self):
        events = itertools.chain(
            code_to_events("樂"),
            [
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
            ],
        )

        reader, _ = handle_all_events(events)
        self.assertEqual(reader.pos, 0)
        self.assertEqual(reader.cxy, (0, 0))

    def test_cursor_position_double_width_character_move_left_right(self):
        events = itertools.chain(
            code_to_events("樂"),
            [
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
                Event(evt="key", data="right", raw=bytearray(b"\x1bOC")),
            ],
        )

        reader, _ = handle_all_events(events)
        self.assertEqual(reader.pos, 1)

        # 2 for wide character
        self.assertEqual(reader.cxy, (2, 0))

    def test_cursor_position_double_width_characters_move_up(self):
        for_loop = "for _ in _:"

        # fmt: off
        code = (
           f"{for_loop}\n"
            "  ' 可口可乐; 可口可樂'"
        )
        # fmt: on

        events = itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
            ],
        )

        reader, _ = handle_all_events(events)

        # cursor at end of first line
        self.assertEqual(reader.pos, len(for_loop))
        self.assertEqual(reader.cxy, (len(for_loop), 0))

    def test_cursor_position_double_width_characters_move_up_down(self):
        for_loop = "for _ in _:"

        # fmt: off
        code = (
           f"{for_loop}\n"
            "  ' 可口可乐; 可口可樂'"
        )
        # fmt: on

        events = itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
            ],
        )

        reader, _ = handle_all_events(events)

        # cursor here (showing 2nd line only):
        # <  ' 可口可乐; 可口可樂'>
        #              ^
        self.assertEqual(reader.pos, 19)
        self.assertEqual(reader.cxy, (10, 1))

    def test_cursor_position_multiple_double_width_characters_move_left(self):
        events = itertools.chain(
            code_to_events("' 可口可乐; 可口可樂'"),
            [
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
            ],
        )

        reader, _ = handle_all_events(events)
        self.assertEqual(reader.pos, 10)

        # 1 for quote, 1 for space, 2 per wide character,
        # 1 for semicolon, 1 for space, 2 per wide character
        self.assertEqual(reader.cxy, (16, 0))

    def test_cursor_position_move_up_to_eol(self):
        first_line = "for _ in _:"
        second_line = "  hello"

        # fmt: off
        code = (
            f"{first_line}\n"
            f"{second_line}\n"
             "  h\n"
             "  hel"
        )
        # fmt: on

        events = itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
            ],
        )

        reader, _ = handle_all_events(events)

        # Cursor should be at end of line 1, even though line 2 is shorter
        # for _ in _:
        #   hello
        #   h
        #   hel
        self.assertEqual(
            reader.pos, len(first_line) + len(second_line) + 1
        )  # +1 for newline
        self.assertEqual(reader.cxy, (len(second_line), 1))

    def test_cursor_position_move_down_to_eol(self):
        last_line = "  hel"

        # fmt: off
        code = (
            "for _ in _:\n"
            "  hello\n"
            "  h\n"
           f"{last_line}"
        )
        # fmt: on

        events = itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
            ],
        )

        reader, _ = handle_all_events(events)

        # Cursor should be at end of line 3, even though line 2 is shorter
        # for _ in _:
        #   hello
        #   h
        #   hel
        self.assertEqual(reader.pos, len(code))
        self.assertEqual(reader.cxy, (len(last_line), 3))

    def test_cursor_position_multiple_mixed_lines_move_up(self):
        # fmt: off
        code = (
            "def foo():\n"
            "  x = '可口可乐; 可口可樂'\n"
            "  y = 'abckdfjskldfjslkdjf'"
        )
        # fmt: on

        events = itertools.chain(
            code_to_events(code),
            13 * [Event(evt="key", data="left", raw=bytearray(b"\x1bOD"))],
            [Event(evt="key", data="up", raw=bytearray(b"\x1bOA"))],
        )

        reader, _ = handle_all_events(events)

        # By moving left, we're before the s:
        # y = 'abckdfjskldfjslkdjf'
        #             ^
        # And we should move before the semi-colon despite the different offset
        # x = '可口可乐; 可口可樂'
        #            ^
        self.assertEqual(reader.pos, 22)
        self.assertEqual(reader.cxy, (15, 1))

    def test_cursor_position_after_wrap_and_move_up(self):
        # fmt: off
        code = (
            "def foo():\n"
            "  hello"
        )
        # fmt: on

        events = itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
            ],
        )
        reader, _ = handle_events_narrow_console(events)

        # The code looks like this:
        # def foo()\
        # :
        #   hello
        # After moving up we should be after the colon in line 2
        self.assertEqual(reader.pos, 10)
        self.assertEqual(reader.cxy, (1, 1))


class TestPyReplAutoindent(TestCase):
    def prepare_reader(self, events):
        console = FakeConsole(events)
        config = ReadlineConfig(readline_completer=None)
        reader = ReadlineAlikeReader(console=console, config=config)
        return reader

    def test_auto_indent_default(self):
        # fmt: off
        input_code = (
            "def f():\n"
                "pass\n\n"
        )

        output_code = (
            "def f():\n"
            "    pass\n"
            "    "
        )
        # fmt: on

        events = code_to_events(input_code)
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, output_code)

    def test_auto_indent_continuation(self):
        # auto indenting according to previous user indentation
        # fmt: off
        events = itertools.chain(
            code_to_events("def f():\n"),
            # add backspace to delete default auto-indent
            [
                Event(evt="key", data="backspace", raw=bytearray(b"\x7f")),
            ],
            code_to_events(
                "  pass\n"
                  "pass\n\n"
            ),
        )

        output_code = (
            "def f():\n"
            "  pass\n"
            "  pass\n"
            "  "
        )
        # fmt: on

        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, output_code)

    def test_auto_indent_prev_block(self):
        # auto indenting according to indentation in different block
        # fmt: off
        events = itertools.chain(
            code_to_events("def f():\n"),
            # add backspace to delete default auto-indent
            [
                Event(evt="key", data="backspace", raw=bytearray(b"\x7f")),
            ],
            code_to_events(
                "  pass\n"
                "pass\n\n"
            ),
            code_to_events(
                "def g():\n"
                  "pass\n\n"
            ),
        )

        output_code = (
            "def g():\n"
            "  pass\n"
            "  "
        )
        # fmt: on

        reader = self.prepare_reader(events)
        output1 = multiline_input(reader)
        output2 = multiline_input(reader)
        self.assertEqual(output2, output_code)

    def test_auto_indent_multiline(self):
        # fmt: off
        events = itertools.chain(
            code_to_events(
                "def f():\n"
                    "pass"
            ),
            [
                # go to the end of the first line
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="\x05", raw=bytearray(b"\x1bO5")),
                # new line should be autoindented
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
            ],
            code_to_events(
                "pass"
            ),
            [
                # go to end of last line
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
                Event(evt="key", data="\x05", raw=bytearray(b"\x1bO5")),
                # double newline to terminate the block
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
            ],
        )

        output_code = (
            "def f():\n"
            "    pass\n"
            "    pass\n"
            "    "
        )
        # fmt: on

        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, output_code)

    def test_auto_indent_with_comment(self):
        # fmt: off
        events = code_to_events(
            "def f():  # foo\n"
                "pass\n\n"
        )

        output_code = (
            "def f():  # foo\n"
            "    pass\n"
            "    "
        )
        # fmt: on

        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, output_code)

    def test_auto_indent_with_multicomment(self):
        # fmt: off
        events = code_to_events(
            "def f():  ## foo\n"
                "pass\n\n"
        )

        output_code = (
            "def f():  ## foo\n"
            "    pass\n"
            "    "
        )
        # fmt: on

        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, output_code)

    def test_auto_indent_ignore_comments(self):
        # fmt: off
        events = code_to_events(
            "pass  #:\n"
        )

        output_code = (
            "pass  #:"
        )
        # fmt: on

        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, output_code)


class TestPyReplOutput(ScreenEqualMixin, TestCase):
    def prepare_reader(self, events):
        console = FakeConsole(events)
        config = ReadlineConfig(readline_completer=None)
        reader = ReadlineAlikeReader(console=console, config=config)
        reader.can_colorize = False
        return reader

    def test_stdin_is_tty(self):
        # Used during test log analysis to figure out if a TTY was available.
        try:
            if os.isatty(sys.stdin.fileno()):
                return
        except OSError as ose:
            self.skipTest(f"stdin tty check failed: {ose}")
        else:
            self.skipTest("stdin is not a tty")

    def test_stdout_is_tty(self):
        # Used during test log analysis to figure out if a TTY was available.
        try:
            if os.isatty(sys.stdout.fileno()):
                return
        except OSError as ose:
            self.skipTest(f"stdout tty check failed: {ose}")
        else:
            self.skipTest("stdout is not a tty")

    def test_basic(self):
        reader = self.prepare_reader(code_to_events("1+1\n"))

        output = multiline_input(reader)
        self.assertEqual(output, "1+1")
        self.assert_screen_equal(reader, "1+1", clean=True)

    def test_get_line_buffer_returns_str(self):
        reader = self.prepare_reader(code_to_events("\n"))
        wrapper = _ReadlineWrapper(f_in=None, f_out=None, reader=reader)
        self.assertIs(type(wrapper.get_line_buffer()), str)

    def test_multiline_edit(self):
        events = itertools.chain(
            code_to_events("def f():\n...\n\n"),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
                Event(evt="key", data="left", raw=bytearray(b"\x1bOD")),
                Event(evt="key", data="backspace", raw=bytearray(b"\x08")),
                Event(evt="key", data="g", raw=bytearray(b"g")),
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
                Event(evt="key", data="backspace", raw=bytearray(b"\x08")),
                Event(evt="key", data="delete", raw=bytearray(b"\x7F")),
                Event(evt="key", data="right", raw=bytearray(b"g")),
                Event(evt="key", data="backspace", raw=bytearray(b"\x08")),
                Event(evt="key", data="p", raw=bytearray(b"p")),
                Event(evt="key", data="a", raw=bytearray(b"a")),
                Event(evt="key", data="s", raw=bytearray(b"s")),
                Event(evt="key", data="s", raw=bytearray(b"s")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
            ],
        )
        reader = self.prepare_reader(events)

        output = multiline_input(reader)
        expected = "def f():\n    ...\n    "
        self.assertEqual(output, expected)
        self.assert_screen_equal(reader, expected, clean=True)
        output = multiline_input(reader)
        expected = "def g():\n    pass\n    "
        self.assertEqual(output, expected)
        self.assert_screen_equal(reader, expected, clean=True)

    def test_history_navigation_with_up_arrow(self):
        events = itertools.chain(
            code_to_events("1+1\n2+2\n"),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
            ],
        )

        reader = self.prepare_reader(events)

        output = multiline_input(reader)
        self.assertEqual(output, "1+1")
        self.assert_screen_equal(reader, "1+1", clean=True)
        output = multiline_input(reader)
        self.assertEqual(output, "2+2")
        self.assert_screen_equal(reader, "2+2", clean=True)
        output = multiline_input(reader)
        self.assertEqual(output, "2+2")
        self.assert_screen_equal(reader, "2+2", clean=True)
        output = multiline_input(reader)
        self.assertEqual(output, "1+1")
        self.assert_screen_equal(reader, "1+1", clean=True)

    def test_history_with_multiline_entries(self):
        code = "def foo():\nx = 1\ny = 2\nz = 3\n\ndef bar():\nreturn 42\n\n"
        events = list(itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
            ]
        ))

        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        output = multiline_input(reader)
        output = multiline_input(reader)
        expected = "def foo():\n    x = 1\n    y = 2\n    z = 3\n    "
        self.assert_screen_equal(reader, expected, clean=True)
        self.assertEqual(output, expected)


    def test_history_navigation_with_down_arrow(self):
        events = itertools.chain(
            code_to_events("1+1\n2+2\n"),
            [
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
            ],
        )

        reader = self.prepare_reader(events)

        output = multiline_input(reader)
        self.assertEqual(output, "1+1")
        self.assert_screen_equal(reader, "1+1", clean=True)

    def test_history_search(self):
        events = itertools.chain(
            code_to_events("1+1\n2+2\n3+3\n"),
            [
                Event(evt="key", data="\x12", raw=bytearray(b"\x12")),
                Event(evt="key", data="1", raw=bytearray(b"1")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
            ],
        )

        reader = self.prepare_reader(events)

        output = multiline_input(reader)
        self.assertEqual(output, "1+1")
        self.assert_screen_equal(reader, "1+1", clean=True)
        output = multiline_input(reader)
        self.assertEqual(output, "2+2")
        self.assert_screen_equal(reader, "2+2", clean=True)
        output = multiline_input(reader)
        self.assertEqual(output, "3+3")
        self.assert_screen_equal(reader, "3+3", clean=True)
        output = multiline_input(reader)
        self.assertEqual(output, "1+1")
        self.assert_screen_equal(reader, "1+1", clean=True)

    def test_control_character(self):
        events = code_to_events("c\x1d\n")
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, "c\x1d")
        self.assert_screen_equal(reader, "c\x1d", clean=True)

    def test_history_search_backward(self):
        # Test <page up> history search backward with "imp" input
        events = itertools.chain(
            code_to_events("import os\n"),
            code_to_events("imp"),
            [
                Event(evt='key', data='page up', raw=bytearray(b'\x1b[5~')),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
            ],
        )

        # fill the history
        reader = self.prepare_reader(events)
        multiline_input(reader)

        # search for "imp" in history
        output = multiline_input(reader)
        self.assertEqual(output, "import os")
        self.assert_screen_equal(reader, "import os", clean=True)

    def test_history_search_backward_empty(self):
        # Test <page up> history search backward with an empty input
        events = itertools.chain(
            code_to_events("import os\n"),
            [
                Event(evt='key', data='page up', raw=bytearray(b'\x1b[5~')),
                Event(evt="key", data="\n", raw=bytearray(b"\n")),
            ],
        )

        # fill the history
        reader = self.prepare_reader(events)
        multiline_input(reader)

        # search backward in history
        output = multiline_input(reader)
        self.assertEqual(output, "import os")
        self.assert_screen_equal(reader, "import os", clean=True)


class TestPyReplCompleter(TestCase):
    def prepare_reader(self, events, namespace):
        console = FakeConsole(events)
        config = ReadlineConfig()
        config.readline_completer = rlcompleter.Completer(namespace).complete
        reader = ReadlineAlikeReader(console=console, config=config)
        return reader

    @patch("rlcompleter._readline_available", False)
    def test_simple_completion(self):
        events = code_to_events("os.getpid\t\n")

        namespace = {"os": os}
        reader = self.prepare_reader(events, namespace)

        output = multiline_input(reader, namespace)
        self.assertEqual(output, "os.getpid()")

    def test_completion_with_many_options(self):
        # Test with something that initially displays many options
        # and then complete from one of them. The first time tab is
        # pressed, the options are displayed (which corresponds to
        # when the repl shows [ not unique ]) and the second completes
        # from one of them.
        events = code_to_events("os.\t\tO_AP\t\n")

        namespace = {"os": os}
        reader = self.prepare_reader(events, namespace)

        output = multiline_input(reader, namespace)
        self.assertEqual(output, "os.O_APPEND")

    def test_empty_namespace_completion(self):
        events = code_to_events("os.geten\t\n")
        namespace = {}
        reader = self.prepare_reader(events, namespace)

        output = multiline_input(reader, namespace)
        self.assertEqual(output, "os.geten")

    def test_global_namespace_completion(self):
        events = code_to_events("py\t\n")
        namespace = {"python": None}
        reader = self.prepare_reader(events, namespace)
        output = multiline_input(reader, namespace)
        self.assertEqual(output, "python")

    def test_up_down_arrow_with_completion_menu(self):
        """Up arrow in the middle of unfinished tab completion when the menu is displayed
        should work and trigger going back in history. Down arrow should subsequently
        get us back to the incomplete command."""
        code = "import os\nos.\t\t"
        namespace = {"os": os}

        events = itertools.chain(
            code_to_events(code),
            [
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
                Event(evt="key", data="up", raw=bytearray(b"\x1bOA")),
                Event(evt="key", data="down", raw=bytearray(b"\x1bOB")),
            ],
            code_to_events("\n"),
        )
        reader = self.prepare_reader(events, namespace=namespace)
        output = multiline_input(reader, namespace)
        # This is the first line, nothing to see here
        self.assertEqual(output, "import os")
        # This is the second line. We pressed up and down arrows
        # so we should end up where we were when we initiated tab completion.
        output = multiline_input(reader, namespace)
        self.assertEqual(output, "os.")

    @patch("_pyrepl.readline._ReadlineWrapper.get_reader")
    @patch("sys.stderr", new_callable=io.StringIO)
    def test_completion_with_warnings(self, mock_stderr, mock_get_reader):
        class Dummy:
            @property
            def test_func(self):
                import warnings

                warnings.warn("warnings\n")
                return None

        dummy = Dummy()
        events = code_to_events("dummy.test_func.\t\n\n")
        namespace = {"dummy": dummy}
        reader = self.prepare_reader(events, namespace)
        mock_get_reader.return_value = reader
        output = readline_multiline_input(more_lines, ">>>", "...")
        self.assertEqual(output, "dummy.test_func.__")
        self.assertEqual(mock_stderr.getvalue(), "")


class TestPyReplModuleCompleter(TestCase):
    def setUp(self):
        # Make iter_modules() search only the standard library.
        # This makes the test more reliable in case there are
        # other user packages/scripts on PYTHONPATH which can
        # interfere with the completions.
        lib_path = os.path.dirname(importlib.__path__[0])
        self._saved_sys_path = sys.path
        sys.path = [lib_path]

    def tearDown(self):
        sys.path = self._saved_sys_path

    def prepare_reader(self, events, namespace):
        console = FakeConsole(events)
        config = ReadlineConfig()
        config.module_completer = ModuleCompleter(namespace)
        config.readline_completer = rlcompleter.Completer(namespace).complete
        reader = ReadlineAlikeReader(console=console, config=config)
        return reader

    def test_import_completions(self):
        cases = (
            ("import path\t\n", "import pathlib"),
            ("import importlib.\t\tres\t\n", "import importlib.resources"),
            ("import importlib.resources.\t\ta\t\n", "import importlib.resources.abc"),
            ("import foo, impo\t\n", "import foo, importlib"),
            ("import foo as bar, impo\t\n", "import foo as bar, importlib"),
            ("from impo\t\n", "from importlib"),
            ("from importlib.res\t\n", "from importlib.resources"),
            ("from importlib.\t\tres\t\n", "from importlib.resources"),
            ("from importlib.resources.ab\t\n", "from importlib.resources.abc"),
            ("from importlib import mac\t\n", "from importlib import machinery"),
            ("from importlib import res\t\n", "from importlib import resources"),
            ("from importlib.res\t import a\t\n", "from importlib.resources import abc"),
        )
        for code, expected in cases:
            with self.subTest(code=code):
                events = code_to_events(code)
                reader = self.prepare_reader(events, namespace={})
                output = reader.readline()
                self.assertEqual(output, expected)

    @patch("pkgutil.iter_modules", lambda: [ModuleInfo(None, "public", True),
                                            ModuleInfo(None, "_private", True)])
    @patch("sys.builtin_module_names", ())
    def test_private_completions(self):
        cases = (
            # Return public methods by default
            ("import \t\n", "import public"),
            ("from \t\n", "from public"),
            # Return private methods if explicitly specified
            ("import _\t\n", "import _private"),
            ("from _\t\n", "from _private"),
        )
        for code, expected in cases:
            with self.subTest(code=code):
                events = code_to_events(code)
                reader = self.prepare_reader(events, namespace={})
                output = reader.readline()
                self.assertEqual(output, expected)

    @patch(
        "_pyrepl._module_completer.ModuleCompleter.iter_submodules",
        lambda *_: [
            ModuleInfo(None, "public", True),
            ModuleInfo(None, "_private", True),
        ],
    )
    def test_sub_module_private_completions(self):
        cases = (
            # Return public methods by default
            ("from foo import \t\n", "from foo import public"),
            # Return private methods if explicitly specified
            ("from foo import _\t\n", "from foo import _private"),
        )
        for code, expected in cases:
            with self.subTest(code=code):
                events = code_to_events(code)
                reader = self.prepare_reader(events, namespace={})
                output = reader.readline()
                self.assertEqual(output, expected)

    def test_builtin_completion_top_level(self):
        cases = (
            ("import bui\t\n", "import builtins"),
            ("from bui\t\n", "from builtins"),
        )
        for code, expected in cases:
            with self.subTest(code=code):
                events = code_to_events(code)
                reader = self.prepare_reader(events, namespace={})
                output = reader.readline()
                self.assertEqual(output, expected)

    def test_relative_import_completions(self):
        cases = (
            (None, "from .readl\t\n", "from .readl"),
            (None, "from . import readl\t\n", "from . import readl"),
            ("_pyrepl", "from .readl\t\n", "from .readline"),
            ("_pyrepl", "from . import readl\t\n", "from . import readline"),
        )
        for package, code, expected in cases:
            with self.subTest(code=code):
                events = code_to_events(code)
                reader = self.prepare_reader(events, namespace={"__package__": package})
                output = reader.readline()
                self.assertEqual(output, expected)

    @patch("pkgutil.iter_modules", lambda: [ModuleInfo(None, "valid_name", True),
                                            ModuleInfo(None, "invalid-name", True)])
    def test_invalid_identifiers(self):
        # Make sure modules which are not valid identifiers
        # are not suggested as those cannot be imported via 'import'.
        cases = (
            ("import valid\t\n", "import valid_name"),
            # 'invalid-name' contains a dash and should not be completed
            ("import invalid\t\n", "import invalid"),
        )
        for code, expected in cases:
            with self.subTest(code=code):
                events = code_to_events(code)
                reader = self.prepare_reader(events, namespace={})
                output = reader.readline()
                self.assertEqual(output, expected)

    def test_no_fallback_on_regular_completion(self):
        cases = (
            ("import pri\t\n", "import pri"),
            ("from pri\t\n", "from pri"),
            ("from typing import Na\t\n", "from typing import Na"),
        )
        for code, expected in cases:
            with self.subTest(code=code):
                events = code_to_events(code)
                reader = self.prepare_reader(events, namespace={})
                output = reader.readline()
                self.assertEqual(output, expected)

    def test_hardcoded_stdlib_submodules(self):
        cases = (
            ("import collections.\t\n", "import collections.abc"),
            ("from os import \t\n", "from os import path"),
            ("import xml.parsers.expat.\t\te\t\n\n", "import xml.parsers.expat.errors"),
            ("from xml.parsers.expat import \t\tm\t\n\n", "from xml.parsers.expat import model"),
        )
        for code, expected in cases:
            with self.subTest(code=code):
                events = code_to_events(code)
                reader = self.prepare_reader(events, namespace={})
                output = reader.readline()
                self.assertEqual(output, expected)

    def test_hardcoded_stdlib_submodules_not_proposed_if_local_import(self):
        with tempfile.TemporaryDirectory() as _dir:
            dir = pathlib.Path(_dir)
            (dir / "collections").mkdir()
            (dir / "collections" / "__init__.py").touch()
            (dir / "collections" / "foo.py").touch()
            with patch.object(sys, "path", [dir, *sys.path]):
                events = code_to_events("import collections.\t\n")
                reader = self.prepare_reader(events, namespace={})
                output = reader.readline()
                self.assertEqual(output, "import collections.foo")

    def test_get_path_and_prefix(self):
        cases = (
            ('', ('', '')),
            ('.', ('.', '')),
            ('..', ('..', '')),
            ('.foo', ('.', 'foo')),
            ('..foo', ('..', 'foo')),
            ('..foo.', ('..foo', '')),
            ('..foo.bar', ('..foo', 'bar')),
            ('.foo.bar.', ('.foo.bar', '')),
            ('..foo.bar.', ('..foo.bar', '')),
            ('foo', ('', 'foo')),
            ('foo.', ('foo', '')),
            ('foo.bar', ('foo', 'bar')),
            ('foo.bar.', ('foo.bar', '')),
            ('foo.bar.baz', ('foo.bar', 'baz')),
        )
        completer = ModuleCompleter()
        for name, expected in cases:
            with self.subTest(name=name):
                self.assertEqual(completer.get_path_and_prefix(name), expected)

    def test_parse(self):
        cases = (
            ('import ', (None, '')),
            ('import foo', (None, 'foo')),
            ('import foo,', (None, '')),
            ('import foo, ', (None, '')),
            ('import foo, bar', (None, 'bar')),
            ('import foo, bar, baz', (None, 'baz')),
            ('import foo as bar,', (None, '')),
            ('import foo as bar, ', (None, '')),
            ('import foo as bar, baz', (None, 'baz')),
            ('import a.', (None, 'a.')),
            ('import a.b', (None, 'a.b')),
            ('import a.b.', (None, 'a.b.')),
            ('import a.b.c', (None, 'a.b.c')),
            ('import a.b.c, foo', (None, 'foo')),
            ('import a.b.c, foo.bar', (None, 'foo.bar')),
            ('import a.b.c, foo.bar,', (None, '')),
            ('import a.b.c, foo.bar, ', (None, '')),
            ('from foo', ('foo', None)),
            ('from a.', ('a.', None)),
            ('from a.b', ('a.b', None)),
            ('from a.b.', ('a.b.', None)),
            ('from a.b.c', ('a.b.c', None)),
            ('from foo import ', ('foo', '')),
            ('from foo import a', ('foo', 'a')),
            ('from ', ('', None)),
            ('from . import a', ('.', 'a')),
            ('from .foo import a', ('.foo', 'a')),
            ('from ..foo import a', ('..foo', 'a')),
            ('from foo import (', ('foo', '')),
            ('from foo import ( ', ('foo', '')),
            ('from foo import (a', ('foo', 'a')),
            ('from foo import (a,', ('foo', '')),
            ('from foo import (a, ', ('foo', '')),
            ('from foo import (a, c', ('foo', 'c')),
            ('from foo import (a as b, c', ('foo', 'c')),
        )
        for code, parsed in cases:
            parser = ImportParser(code)
            actual = parser.parse()
            with self.subTest(code=code):
                self.assertEqual(actual, parsed)
            # The parser should not get tripped up by any
            # other preceding statements
            _code = f'import xyz\n{code}'
            parser = ImportParser(_code)
            actual = parser.parse()
            with self.subTest(code=_code):
                self.assertEqual(actual, parsed)
            _code = f'import xyz;{code}'
            parser = ImportParser(_code)
            actual = parser.parse()
            with self.subTest(code=_code):
                self.assertEqual(actual, parsed)

    def test_parse_error(self):
        cases = (
            '',
            'import foo ',
            'from foo ',
            'import foo. ',
            'import foo.bar ',
            'from foo ',
            'from foo. ',
            'from foo.bar ',
            'from foo import bar ',
            'from foo import (bar ',
            'from foo import bar, baz ',
            'import foo as',
            'import a. as',
            'import a.b as',
            'import a.b. as',
            'import a.b.c as',
            'import (foo',
            'import (',
            'import .foo',
            'import ..foo',
            'import .foo.bar',
            'import foo; x = 1',
            'import a.; x = 1',
            'import a.b; x = 1',
            'import a.b.; x = 1',
            'import a.b.c; x = 1',
            'from foo import a as',
            'from foo import a. as',
            'from foo import a.b as',
            'from foo import a.b. as',
            'from foo import a.b.c as',
            'from foo impo',
            'import import',
            'import from',
            'import as',
            'from import',
            'from from',
            'from as',
            'from foo import import',
            'from foo import from',
            'from foo import as',
        )
        for code in cases:
            parser = ImportParser(code)
            actual = parser.parse()
            with self.subTest(code=code):
                self.assertEqual(actual, None)


class TestHardcodedSubmodules(TestCase):
    def test_hardcoded_stdlib_submodules_are_importable(self):
        for parent_path, submodules in HARDCODED_SUBMODULES.items():
            for module_name in submodules:
                path = f"{parent_path}.{module_name}"
                with self.subTest(path=path):
                    # We can't use importlib.util.find_spec here,
                    # since some hardcoded submodules parents are
                    # not proper packages
                    importlib.import_module(path)


class TestPasteEvent(TestCase):
    def prepare_reader(self, events):
        console = FakeConsole(events)
        config = ReadlineConfig(readline_completer=None)
        reader = ReadlineAlikeReader(console=console, config=config)
        return reader

    def test_paste(self):
        # fmt: off
        code = (
            "def a():\n"
            "  for x in range(10):\n"
            "    if x%2:\n"
            "      print(x)\n"
            "    else:\n"
            "      pass\n"
        )
        # fmt: on

        events = itertools.chain(
            [
                Event(evt="key", data="f3", raw=bytearray(b"\x1bOR")),
            ],
            code_to_events(code),
            [
                Event(evt="key", data="f3", raw=bytearray(b"\x1bOR")),
            ],
            code_to_events("\n"),
        )
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, code)

    def test_paste_mid_newlines(self):
        # fmt: off
        code = (
            "def f():\n"
            "  x = y\n"
            "  \n"
            "  y = z\n"
        )
        # fmt: on

        events = itertools.chain(
            [
                Event(evt="key", data="f3", raw=bytearray(b"\x1bOR")),
            ],
            code_to_events(code),
            [
                Event(evt="key", data="f3", raw=bytearray(b"\x1bOR")),
            ],
            code_to_events("\n"),
        )
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, code)

    def test_paste_mid_newlines_not_in_paste_mode(self):
        # fmt: off
        code = (
            "def f():\n"
                "x = y\n"
                "\n"
                "y = z\n\n"
        )

        expected = (
            "def f():\n"
            "    x = y\n"
            "    "
        )
        # fmt: on

        events = code_to_events(code)
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, expected)

    def test_paste_not_in_paste_mode(self):
        # fmt: off
        input_code = (
            "def a():\n"
                "for x in range(10):\n"
                    "if x%2:\n"
                        "print(x)\n"
                    "else:\n"
                        "pass\n\n"
        )

        output_code = (
            "def a():\n"
            "    for x in range(10):\n"
            "        if x%2:\n"
            "            print(x)\n"
            "            else:"
        )
        # fmt: on

        events = code_to_events(input_code)
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, output_code)

    def test_bracketed_paste(self):
        """Test that bracketed paste using \x1b[200~ and \x1b[201~ works."""
        # fmt: off
        input_code = (
            "def a():\n"
            "  for x in range(10):\n"
            "\n"
            "    if x%2:\n"
            "      print(x)\n"
            "\n"
            "    else:\n"
            "      pass\n"
        )

        output_code = (
            "def a():\n"
            "  for x in range(10):\n"
            "\n"
            "    if x%2:\n"
            "      print(x)\n"
            "\n"
            "    else:\n"
            "      pass\n"
        )
        # fmt: on

        paste_start = "\x1b[200~"
        paste_end = "\x1b[201~"

        events = itertools.chain(
            code_to_events(paste_start),
            code_to_events(input_code),
            code_to_events(paste_end),
            code_to_events("\n"),
        )
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, output_code)

    def test_bracketed_paste_single_line(self):
        input_code = "oneline"

        paste_start = "\x1b[200~"
        paste_end = "\x1b[201~"

        events = itertools.chain(
            code_to_events(paste_start),
            code_to_events(input_code),
            code_to_events(paste_end),
            code_to_events("\n"),
        )
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, input_code)


@skipUnless(pty, "requires pty")
class TestDumbTerminal(ReplTestCase):
    def test_dumb_terminal_exits_cleanly(self):
        env = os.environ.copy()
        env.pop('PYTHON_BASIC_REPL', None)
        env.update({"TERM": "dumb"})
        output, exit_code = self.run_repl("exit()\n", env=env)
        self.assertEqual(exit_code, 0)
        self.assertIn("warning: can't use pyrepl", output)
        self.assertNotIn("Exception", output)
        self.assertNotIn("Traceback", output)


@skipUnless(pty, "requires pty")
@skipIf((os.environ.get("TERM") or "dumb") == "dumb", "can't use pyrepl in dumb terminal")
class TestMain(ReplTestCase):
    def setUp(self):
        # Cleanup from PYTHON* variables to isolate from local
        # user settings, see #121359.  Such variables should be
        # added later in test methods to patched os.environ.
        super().setUp()
        patcher = patch('os.environ', new=make_clean_env())
        self.addCleanup(patcher.stop)
        patcher.start()

    @force_not_colorized
    def test_exposed_globals_in_repl(self):
        pre = "['__builtins__'"
        post = "'__loader__', '__name__', '__package__', '__spec__']"
        output, exit_code = self.run_repl(["sorted(dir())", "exit()"], skip=True)
        self.assertEqual(exit_code, 0)

        # if `__main__` is not a file (impossible with pyrepl)
        case1 = f"{pre}, '__doc__', {post}" in output

        # if `__main__` is an uncached .py file (no .pyc)
        case2 = f"{pre}, '__doc__', '__file__', {post}" in output

        # if `__main__` is a cached .pyc file and the .py source exists
        case3 = f"{pre}, '__cached__', '__doc__', '__file__', {post}" in output

        # if `__main__` is a cached .pyc file but there's no .py source file
        case4 = f"{pre}, '__cached__', '__doc__', {post}" in output

        self.assertTrue(case1 or case2 or case3 or case4, output)

    def _assertMatchOK(
            self, var: str, expected: str | re.Pattern, actual: str
    ) -> None:
        if isinstance(expected, re.Pattern):
            self.assertTrue(
                expected.match(actual),
                f"{var}={actual} does not match {expected.pattern}",
            )
        else:
            self.assertEqual(
                actual,
                expected,
                f"expected {var}={expected}, got {var}={actual}",
            )

    @force_not_colorized
    def _run_repl_globals_test(self, expectations, *, as_file=False, as_module=False, pythonstartup=False):
        clean_env = make_clean_env()
        clean_env["NO_COLOR"] = "1"  # force_not_colorized doesn't touch subprocesses

        with tempfile.TemporaryDirectory() as td:
            blue = pathlib.Path(td) / "blue"
            blue.mkdir()
            mod = blue / "calx.py"
            mod.write_text("FOO = 42", encoding="utf-8")
            startup = blue / "startup.py"
            startup.write_text("BAR = 64", encoding="utf-8")
            commands = [
                "print(f'^{" + var + "=}')" for var in expectations
            ] + ["exit()"]
            if pythonstartup:
                clean_env["PYTHONSTARTUP"] = str(startup)
            if as_file and as_module:
                self.fail("as_file and as_module are mutually exclusive")
            elif as_file:
                output, exit_code = self.run_repl(
                    commands,
                    cmdline_args=[str(mod)],
                    env=clean_env,
                    skip=True,
                )
            elif as_module:
                output, exit_code = self.run_repl(
                    commands,
                    cmdline_args=["-m", "blue.calx"],
                    env=clean_env,
                    cwd=td,
                    skip=True,
                )
            else:
                output, exit_code = self.run_repl(
                    commands,
                    cmdline_args=[],
                    env=clean_env,
                    cwd=td,
                    skip=True,
                )

        self.assertEqual(exit_code, 0)
        for var, expected in expectations.items():
            with self.subTest(var=var, expected=expected):
                if m := re.search(rf"\^{var}=(.+?)[\r\n]", output):
                    self._assertMatchOK(var, expected, actual=m.group(1))
                else:
                    self.fail(f"{var}= not found in output: {output!r}\n\n{output}")

        self.assertNotIn("Exception", output)
        self.assertNotIn("Traceback", output)

    def test_globals_initialized_as_default(self):
        expectations = {
            "__name__": "'__main__'",
            "__package__": "None",
            # "__file__" is missing in -i, like in the basic REPL
        }
        self._run_repl_globals_test(expectations)

    def test_globals_initialized_from_pythonstartup(self):
        expectations = {
            "BAR": "64",
            "__name__": "'__main__'",
            "__package__": "None",
            # "__file__" is missing in -i, like in the basic REPL
        }
        self._run_repl_globals_test(expectations, pythonstartup=True)

    def test_inspect_keeps_globals_from_inspected_file(self):
        expectations = {
            "FOO": "42",
            "__name__": "'__main__'",
            "__package__": "None",
            # "__file__" is missing in -i, like in the basic REPL
        }
        self._run_repl_globals_test(expectations, as_file=True)

    def test_inspect_keeps_globals_from_inspected_file_with_pythonstartup(self):
        expectations = {
            "FOO": "42",
            "BAR": "64",
            "__name__": "'__main__'",
            "__package__": "None",
            # "__file__" is missing in -i, like in the basic REPL
        }
        self._run_repl_globals_test(expectations, as_file=True, pythonstartup=True)

    def test_inspect_keeps_globals_from_inspected_module(self):
        expectations = {
            "FOO": "42",
            "__name__": "'__main__'",
            "__package__": "'blue'",
            "__file__": re.compile(r"^'.*calx.py'$"),
        }
        self._run_repl_globals_test(expectations, as_module=True)

    def test_inspect_keeps_globals_from_inspected_module_with_pythonstartup(self):
        expectations = {
            "FOO": "42",
            "BAR": "64",
            "__name__": "'__main__'",
            "__package__": "'blue'",
            "__file__": re.compile(r"^'.*calx.py'$"),
        }
        self._run_repl_globals_test(expectations, as_module=True, pythonstartup=True)

    @force_not_colorized
    def test_python_basic_repl(self):
        env = os.environ.copy()
        pyrepl_commands = "clear\nexit()\n"
        env.pop("PYTHON_BASIC_REPL", None)
        output, exit_code = self.run_repl(pyrepl_commands, env=env, skip=True)
        self.assertEqual(exit_code, 0)
        self.assertNotIn("Exception", output)
        self.assertNotIn("NameError", output)
        self.assertNotIn("Traceback", output)

        basic_commands = "help\nexit()\n"
        env["PYTHON_BASIC_REPL"] = "1"
        output, exit_code = self.run_repl(basic_commands, env=env)
        self.assertEqual(exit_code, 0)
        self.assertIn("Type help() for interactive help", output)
        self.assertNotIn("Exception", output)
        self.assertNotIn("Traceback", output)

        # The site module must not load _pyrepl if PYTHON_BASIC_REPL is set
        commands = ("import sys\n"
                    "print('_pyrepl' in sys.modules)\n"
                    "exit()\n")
        env["PYTHON_BASIC_REPL"] = "1"
        output, exit_code = self.run_repl(commands, env=env)
        self.assertEqual(exit_code, 0)
        self.assertIn("False", output)
        self.assertNotIn("True", output)
        self.assertNotIn("Exception", output)
        self.assertNotIn("Traceback", output)

    @force_not_colorized
    def test_no_pyrepl_source_in_exc(self):
        # Avoid using _pyrepl/__main__.py in traceback reports
        # See https://github.com/python/cpython/issues/129098.
        pyrepl_main_file = os.path.join(STDLIB_DIR, "_pyrepl", "__main__.py")
        self.assertTrue(os.path.exists(pyrepl_main_file), pyrepl_main_file)
        with open(pyrepl_main_file) as fp:
            excluded_lines = fp.readlines()
        excluded_lines = list(filter(None, map(str.strip, excluded_lines)))

        for filename in ['?', 'unknown-filename', '<foo>', '<...>']:
            self._test_no_pyrepl_source_in_exc(filename, excluded_lines)

    def _test_no_pyrepl_source_in_exc(self, filename, excluded_lines):
        with EnvironmentVarGuard() as env, self.subTest(filename=filename):
            env.unset("PYTHON_BASIC_REPL")
            commands = (f"eval(compile('spam', {filename!r}, 'eval'))\n"
                        f"exit()\n")
            output, _ = self.run_repl(commands, env=env)
            self.assertIn("Traceback (most recent call last)", output)
            self.assertIn("NameError: name 'spam' is not defined", output)
            for line in excluded_lines:
                with self.subTest(line=line):
                    self.assertNotIn(line, output)

    @force_not_colorized
    def test_bad_sys_excepthook_doesnt_crash_pyrepl(self):
        env = os.environ.copy()
        commands = ("import sys\n"
                    "sys.excepthook = 1\n"
                    "1/0\n"
                    "exit()\n")

        def check(output, exitcode):
            self.assertIn("Error in sys.excepthook:", output)
            self.assertEqual(output.count("'int' object is not callable"), 1)
            self.assertIn("Original exception was:", output)
            self.assertIn("division by zero", output)
            self.assertEqual(exitcode, 0)
        env.pop("PYTHON_BASIC_REPL", None)
        output, exit_code = self.run_repl(commands, env=env, skip=True)
        check(output, exit_code)

        env["PYTHON_BASIC_REPL"] = "1"
        output, exit_code = self.run_repl(commands, env=env)
        check(output, exit_code)

    def test_not_wiping_history_file(self):
        # skip, if readline module is not available
        import_module('readline')

        hfile = tempfile.NamedTemporaryFile(delete=False)
        self.addCleanup(unlink, hfile.name)
        env = os.environ.copy()
        env["PYTHON_HISTORY"] = hfile.name
        commands = "123\nspam\nexit()\n"

        env.pop("PYTHON_BASIC_REPL", None)
        output, exit_code = self.run_repl(commands, env=env)
        self.assertEqual(exit_code, 0)
        self.assertIn("123", output)
        self.assertIn("spam", output)
        self.assertNotEqual(pathlib.Path(hfile.name).stat().st_size, 0)

        hfile.file.truncate()
        hfile.close()

        env["PYTHON_BASIC_REPL"] = "1"
        output, exit_code = self.run_repl(commands, env=env)
        self.assertEqual(exit_code, 0)
        self.assertIn("123", output)
        self.assertIn("spam", output)
        self.assertNotEqual(pathlib.Path(hfile.name).stat().st_size, 0)

    @force_not_colorized
    def test_correct_filename_in_syntaxerrors(self):
        env = os.environ.copy()
        commands = "a b c\nexit()\n"
        output, exit_code = self.run_repl(commands, env=env, skip=True)
        self.assertIn("SyntaxError: invalid syntax", output)
        self.assertIn("<python-input-0>", output)
        commands = " b\nexit()\n"
        output, exit_code = self.run_repl(commands, env=env)
        self.assertIn("IndentationError: unexpected indent", output)
        self.assertIn("<python-input-0>", output)

    @force_not_colorized
    def test_proper_tracebacklimit(self):
        env = os.environ.copy()
        for set_tracebacklimit in [True, False]:
            commands = ("import sys\n" +
                        ("sys.tracebacklimit = 1\n" if set_tracebacklimit else "") +
                        "def x1(): 1/0\n\n"
                        "def x2(): x1()\n\n"
                        "def x3(): x2()\n\n"
                        "x3()\n"
                        "exit()\n")

            for basic_repl in [True, False]:
                if basic_repl:
                    env["PYTHON_BASIC_REPL"] = "1"
                else:
                    env.pop("PYTHON_BASIC_REPL", None)
                with self.subTest(set_tracebacklimit=set_tracebacklimit,
                                  basic_repl=basic_repl):
                    output, exit_code = self.run_repl(commands, env=env, skip=True)
                    self.assertIn("in x1", output)
                    if set_tracebacklimit:
                        self.assertNotIn("in x2", output)
                        self.assertNotIn("in x3", output)
                        self.assertNotIn("in <module>", output)
                    else:
                        self.assertIn("in x2", output)
                        self.assertIn("in x3", output)
                        self.assertIn("in <module>", output)

    def test_null_byte(self):
        output, exit_code = self.run_repl("\x00\nexit()\n")
        self.assertEqual(exit_code, 0)
        self.assertNotIn("TypeError", output)

    @force_not_colorized
    def test_non_string_suggestion_candidates(self):
        commands = ("import runpy\n"
                    "runpy._run_module_code('blech', {0: '', 'bluch': ''}, '')\n"
                    "exit()\n")

        output, exit_code = self.run_repl(commands)
        self.assertEqual(exit_code, 0)
        self.assertNotIn("all elements in 'candidates' must be strings", output)
        self.assertIn("bluch", output)

    def test_readline_history_file(self):
        # skip, if readline module is not available
        readline = import_module('readline')
        if readline.backend != "editline":
            self.skipTest("GNU readline is not affected by this issue")

        with tempfile.NamedTemporaryFile() as hfile:
            env = os.environ.copy()
            env["PYTHON_HISTORY"] = hfile.name

            env["PYTHON_BASIC_REPL"] = "1"
            output, exit_code = self.run_repl("spam \nexit()\n", env=env)
            self.assertEqual(exit_code, 0)
            self.assertIn("spam ", output)
            self.assertNotEqual(pathlib.Path(hfile.name).stat().st_size, 0)
            self.assertIn("spam\\040", pathlib.Path(hfile.name).read_text())

            env.pop("PYTHON_BASIC_REPL", None)
            output, exit_code = self.run_repl("exit\n", env=env)
            self.assertEqual(exit_code, 0)
            self.assertNotIn("\\040", pathlib.Path(hfile.name).read_text())

    def test_history_survive_crash(self):
        env = os.environ.copy()

        with tempfile.NamedTemporaryFile() as hfile:
            env["PYTHON_HISTORY"] = hfile.name

            commands = "1\n2\n3\nexit()\n"
            output, exit_code = self.run_repl(commands, env=env, skip=True)
            self.assertEqual(exit_code, 0)

            # Run until "0xcafe" is printed (as "51966") and then kill the
            # process to simulate a crash. Note that the output also includes
            # the echoed input commands.
            commands = "spam\nimport time\n0xcafe\ntime.sleep(1000)\nquit\n"
            output, exit_code = self.run_repl(commands, env=env,
                                              exit_on_output="51966")
            self.assertNotEqual(exit_code, 0)

            history = pathlib.Path(hfile.name).read_text()
            self.assertIn("2", history)
            self.assertIn("exit()", history)
            self.assertIn("spam", history)
            self.assertIn("import time", history)
            # History is written after each command's output is printed to the
            # console, so depending on how quickly the process is killed,
            # the last command may or may not be written to the history file.
            self.assertNotIn("sleep", history)
            self.assertNotIn("quit", history)

    def test_keyboard_interrupt_after_isearch(self):
        output, exit_code = self.run_repl("\x12\x03exit\n")
        self.assertEqual(exit_code, 0)

    def test_prompt_after_help(self):
        output, exit_code = self.run_repl(["help", "q", "exit"])

        # Regex pattern to remove ANSI escape sequences
        ansi_escape = re.compile(r"(\x1B(=|>|(\[)[0-?]*[ -\/]*[@-~]))")
        cleaned_output = ansi_escape.sub("", output)
        self.assertEqual(exit_code, 0)

        # Ensure that we don't see multiple prompts after exiting `help`
        # Extra stuff (newline and `exit` rewrites) are necessary
        # because of how run_repl works.
        self.assertNotIn(">>> \n>>> >>>", cleaned_output)

    @skipUnless(Py_DEBUG, '-X showrefcount requires a Python debug build')
    def test_showrefcount(self):
        env = os.environ.copy()
        env.pop("PYTHON_BASIC_REPL", "")
        output, _ = self.run_repl("1\n1+2\nexit()\n", cmdline_args=['-Xshowrefcount'], env=env)
        matches = re.findall(r'\[-?\d+ refs, \d+ blocks\]', output)
        self.assertEqual(len(matches), 3)

        env["PYTHON_BASIC_REPL"] = "1"
        output, _ = self.run_repl("1\n1+2\nexit()\n", cmdline_args=['-Xshowrefcount'], env=env)
        matches = re.findall(r'\[-?\d+ refs, \d+ blocks\]', output)
        self.assertEqual(len(matches), 3)

    def test_detect_pip_usage_in_repl(self):
        for pip_cmd in ("pip", "pip3", "python -m pip", "python3 -m pip"):
            with self.subTest(pip_cmd=pip_cmd):
                output, exit_code = self.run_repl([f"{pip_cmd} install sampleproject", "exit"])
                self.assertIn("SyntaxError", output)
                hint = (
                    "The Python package manager (pip) can only be used"
                    " outside of the Python REPL"
                )
                self.assertIn(hint, output)