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"""
Very minimal unittests for parts of the readline module.
"""
from contextlib import ExitStack
from errno import EIO
import locale
import os
import selectors
import subprocess
import sys
import tempfile
import unittest
from test.support import import_module, unlink, temp_dir, TESTFN, verbose
from test.support.script_helper import assert_python_ok
# Skip tests if there is no readline module
readline = import_module('readline')
if hasattr(readline, "_READLINE_LIBRARY_VERSION"):
is_editline = ("EditLine wrapper" in readline._READLINE_LIBRARY_VERSION)
else:
is_editline = (readline.__doc__ and "libedit" in readline.__doc__)
def setUpModule():
if verbose:
# Python implementations other than CPython may not have
# these private attributes
if hasattr(readline, "_READLINE_VERSION"):
print(f"readline version: {readline._READLINE_VERSION:#x}")
print(f"readline runtime version: {readline._READLINE_RUNTIME_VERSION:#x}")
if hasattr(readline, "_READLINE_LIBRARY_VERSION"):
print(f"readline library version: {readline._READLINE_LIBRARY_VERSION!r}")
print(f"use libedit emulation? {is_editline}")
@unittest.skipUnless(hasattr(readline, "clear_history"),
"The history update test cannot be run because the "
"clear_history method is not available.")
class TestHistoryManipulation (unittest.TestCase):
"""
These tests were added to check that the libedit emulation on OSX and the
"real" readline have the same interface for history manipulation. That's
why the tests cover only a small subset of the interface.
"""
def testHistoryUpdates(self):
readline.clear_history()
readline.add_history("first line")
readline.add_history("second line")
self.assertEqual(readline.get_history_item(0), None)
self.assertEqual(readline.get_history_item(1), "first line")
self.assertEqual(readline.get_history_item(2), "second line")
readline.replace_history_item(0, "replaced line")
self.assertEqual(readline.get_history_item(0), None)
self.assertEqual(readline.get_history_item(1), "replaced line")
self.assertEqual(readline.get_history_item(2), "second line")
self.assertEqual(readline.get_current_history_length(), 2)
readline.remove_history_item(0)
self.assertEqual(readline.get_history_item(0), None)
self.assertEqual(readline.get_history_item(1), "second line")
self.assertEqual(readline.get_current_history_length(), 1)
@unittest.skipUnless(hasattr(readline, "append_history_file"),
"append_history not available")
def test_write_read_append(self):
hfile = tempfile.NamedTemporaryFile(delete=False)
hfile.close()
hfilename = hfile.name
self.addCleanup(unlink, hfilename)
# test write-clear-read == nop
readline.clear_history()
readline.add_history("first line")
readline.add_history("second line")
readline.write_history_file(hfilename)
readline.clear_history()
self.assertEqual(readline.get_current_history_length(), 0)
readline.read_history_file(hfilename)
self.assertEqual(readline.get_current_history_length(), 2)
self.assertEqual(readline.get_history_item(1), "first line")
self.assertEqual(readline.get_history_item(2), "second line")
# test append
readline.append_history_file(1, hfilename)
readline.clear_history()
readline.read_history_file(hfilename)
self.assertEqual(readline.get_current_history_length(), 3)
self.assertEqual(readline.get_history_item(1), "first line")
self.assertEqual(readline.get_history_item(2), "second line")
self.assertEqual(readline.get_history_item(3), "second line")
# test 'no such file' behaviour
os.unlink(hfilename)
with self.assertRaises(FileNotFoundError):
readline.append_history_file(1, hfilename)
# write_history_file can create the target
readline.write_history_file(hfilename)
def test_nonascii_history(self):
readline.clear_history()
try:
readline.add_history("entrée 1")
except UnicodeEncodeError as err:
self.skipTest("Locale cannot encode test data: " + format(err))
readline.add_history("entrée 2")
readline.replace_history_item(1, "entrée 22")
readline.write_history_file(TESTFN)
self.addCleanup(os.remove, TESTFN)
readline.clear_history()
readline.read_history_file(TESTFN)
if is_editline:
# An add_history() call seems to be required for get_history_
# item() to register items from the file
readline.add_history("dummy")
self.assertEqual(readline.get_history_item(1), "entrée 1")
self.assertEqual(readline.get_history_item(2), "entrée 22")
class TestReadline(unittest.TestCase):
@unittest.skipIf(readline._READLINE_VERSION < 0x0601 and not is_editline,
"not supported in this library version")
def test_init(self):
# Issue #19884: Ensure that the ANSI sequence "\033[1034h" is not
# written into stdout when the readline module is imported and stdout
# is redirected to a pipe.
rc, stdout, stderr = assert_python_ok('-c', 'import readline',
TERM='xterm-256color')
self.assertEqual(stdout, b'')
auto_history_script = """\
import readline
readline.set_auto_history({})
input()
print("History length:", readline.get_current_history_length())
"""
def test_auto_history_enabled(self):
output = run_pty(self.auto_history_script.format(True))
self.assertIn(b"History length: 1\r\n", output)
def test_auto_history_disabled(self):
output = run_pty(self.auto_history_script.format(False))
self.assertIn(b"History length: 0\r\n", output)
def test_nonascii(self):
loc = locale.setlocale(locale.LC_CTYPE, None)
if loc in ('C', 'POSIX'):
# bpo-29240: On FreeBSD, if the LC_CTYPE locale is C or POSIX,
# writing and reading non-ASCII bytes into/from a TTY works, but
# readline or ncurses ignores non-ASCII bytes on read.
self.skipTest(f"the LC_CTYPE locale is {loc!r}")
try:
readline.add_history("\xEB\xEF")
except UnicodeEncodeError as err:
self.skipTest("Locale cannot encode test data: " + format(err))
script = r"""import readline
is_editline = readline.__doc__ and "libedit" in readline.__doc__
inserted = "[\xEFnserted]"
macro = "|t\xEB[after]"
set_pre_input_hook = getattr(readline, "set_pre_input_hook", None)
if is_editline or not set_pre_input_hook:
# The insert_line() call via pre_input_hook() does nothing with Editline,
# so include the extra text that would have been inserted here
macro = inserted + macro
if is_editline:
readline.parse_and_bind(r'bind ^B ed-prev-char')
readline.parse_and_bind(r'bind "\t" rl_complete')
readline.parse_and_bind(r'bind -s ^A "{}"'.format(macro))
else:
readline.parse_and_bind(r'Control-b: backward-char')
readline.parse_and_bind(r'"\t": complete')
readline.parse_and_bind(r'set disable-completion off')
readline.parse_and_bind(r'set show-all-if-ambiguous off')
readline.parse_and_bind(r'set show-all-if-unmodified off')
readline.parse_and_bind(r'Control-a: "{}"'.format(macro))
def pre_input_hook():
readline.insert_text(inserted)
readline.redisplay()
if set_pre_input_hook:
set_pre_input_hook(pre_input_hook)
def completer(text, state):
if text == "t\xEB":
if state == 0:
print("text", ascii(text))
print("line", ascii(readline.get_line_buffer()))
print("indexes", readline.get_begidx(), readline.get_endidx())
return "t\xEBnt"
if state == 1:
return "t\xEBxt"
if text == "t\xEBx" and state == 0:
return "t\xEBxt"
return None
readline.set_completer(completer)
def display(substitution, matches, longest_match_length):
print("substitution", ascii(substitution))
print("matches", ascii(matches))
readline.set_completion_display_matches_hook(display)
print("result", ascii(input()))
print("history", ascii(readline.get_history_item(1)))
"""
input = b"\x01" # Ctrl-A, expands to "|t\xEB[after]"
input += b"\x02" * len("[after]") # Move cursor back
input += b"\t\t" # Display possible completions
input += b"x\t" # Complete "t\xEBx" -> "t\xEBxt"
input += b"\r"
output = run_pty(script, input)
self.assertIn(b"text 't\\xeb'\r\n", output)
self.assertIn(b"line '[\\xefnserted]|t\\xeb[after]'\r\n", output)
self.assertIn(b"indexes 11 13\r\n", output)
if not is_editline and hasattr(readline, "set_pre_input_hook"):
self.assertIn(b"substitution 't\\xeb'\r\n", output)
self.assertIn(b"matches ['t\\xebnt', 't\\xebxt']\r\n", output)
expected = br"'[\xefnserted]|t\xebxt[after]'"
self.assertIn(b"result " + expected + b"\r\n", output)
self.assertIn(b"history " + expected + b"\r\n", output)
# We have 2 reasons to skip this test:
# - readline: history size was added in 6.0
# See https://cnswww.cns.cwru.edu/php/chet/readline/CHANGES
# - editline: history size is broken on OS X 10.11.6.
# Newer versions were not tested yet.
@unittest.skipIf(readline._READLINE_VERSION < 0x600,
"this readline version does not support history-size")
@unittest.skipIf(is_editline,
"editline history size configuration is broken")
def test_history_size(self):
history_size = 10
with temp_dir() as test_dir:
inputrc = os.path.join(test_dir, "inputrc")
with open(inputrc, "wb") as f:
f.write(b"set history-size %d\n" % history_size)
history_file = os.path.join(test_dir, "history")
with open(history_file, "wb") as f:
# history_size * 2 items crashes readline
data = b"".join(b"item %d\n" % i
for i in range(history_size * 2))
f.write(data)
script = """
import os
import readline
history_file = os.environ["HISTORY_FILE"]
readline.read_history_file(history_file)
input()
readline.write_history_file(history_file)
"""
env = dict(os.environ)
env["INPUTRC"] = inputrc
env["HISTORY_FILE"] = history_file
run_pty(script, input=b"last input\r", env=env)
with open(history_file, "rb") as f:
lines = f.readlines()
self.assertEqual(len(lines), history_size)
self.assertEqual(lines[-1].strip(), b"last input")
def run_pty(script, input=b"dummy input\r", env=None):
pty = import_module('pty')
output = bytearray()
[master, slave] = pty.openpty()
args = (sys.executable, '-c', script)
proc = subprocess.Popen(args, stdin=slave, stdout=slave, stderr=slave, env=env)
os.close(slave)
with ExitStack() as cleanup:
cleanup.enter_context(proc)
def terminate(proc):
try:
proc.terminate()
except ProcessLookupError:
# Workaround for Open/Net BSD bug (Issue 16762)
pass
cleanup.callback(terminate, proc)
cleanup.callback(os.close, master)
# Avoid using DefaultSelector and PollSelector. Kqueue() does not
# work with pseudo-terminals on OS X < 10.9 (Issue 20365) and Open
# BSD (Issue 20667). Poll() does not work with OS X 10.6 or 10.4
# either (Issue 20472). Hopefully the file descriptor is low enough
# to use with select().
sel = cleanup.enter_context(selectors.SelectSelector())
sel.register(master, selectors.EVENT_READ | selectors.EVENT_WRITE)
os.set_blocking(master, False)
while True:
for [_, events] in sel.select():
if events & selectors.EVENT_READ:
try:
chunk = os.read(master, 0x10000)
except OSError as err:
# Linux raises EIO when slave is closed (Issue 5380)
if err.errno != EIO:
raise
chunk = b""
if not chunk:
return output
output.extend(chunk)
if events & selectors.EVENT_WRITE:
try:
input = input[os.write(master, input):]
except OSError as err:
# Apparently EIO means the slave was closed
if err.errno != EIO:
raise
input = b"" # Stop writing
if not input:
sel.modify(master, selectors.EVENT_READ)
if __name__ == "__main__":
unittest.main()
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