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from __future__ import print_function # PY2
import sys
import traceback
import warnings
import ctypes.util
from ctypes import (pythonapi, cdll, cast,
c_char_p, c_void_p, c_size_t, CFUNCTYPE)
from .info import WINDOWS
try:
import pyreadline
except ImportError:
pyreadline = None
def get_libc():
if WINDOWS:
path = "msvcrt"
else:
path = ctypes.util.find_library("c")
if path is None:
raise RuntimeError("cannot locate libc")
return cdll[path]
LIBC = get_libc()
PyMem_Malloc = pythonapi.PyMem_Malloc
PyMem_Malloc.restype = c_size_t
PyMem_Malloc.argtypes = [c_size_t]
strncpy = LIBC.strncpy
strncpy.restype = c_char_p
strncpy.argtypes = [c_char_p, c_char_p, c_size_t]
HOOKFUNC = CFUNCTYPE(c_char_p, c_void_p, c_void_p, c_char_p)
#PyOS_ReadlineFunctionPointer = c_void_p.in_dll(pythonapi, "PyOS_ReadlineFunctionPointer")
def new_zero_terminated_string(b):
p = PyMem_Malloc(len(b) + 1)
strncpy(cast(p, c_char_p), b, len(b) + 1)
return p
def check_encodings():
if sys.stdin.encoding != sys.stdout.encoding:
# raise RuntimeError("sys.stdin.encoding != sys.stdout.encoding, readline hook doesn't know, which one to use to decode prompt")
warnings.warn("sys.stdin.encoding == {!r}, whereas sys.stdout.encoding == {!r}, readline hook consumer may assume they are the same".format(sys.stdin.encoding, sys.stdout.encoding),
RuntimeWarning, stacklevel=3)
def stdio_readline(prompt=""):
sys.stdout.write(prompt)
sys.stdout.flush()
return sys.stdin.readline()
class ReadlineHookManager:
def __init__(self):
self.readline_wrapper_ref = HOOKFUNC(self.readline_wrapper)
self.address = cast(self.readline_wrapper_ref, c_void_p).value
#self.original_address = PyOS_ReadlineFunctionPointer.value
self.readline_hook = None
def readline_wrapper(self, stdin, stdout, prompt):
try:
try:
check_encodings()
except RuntimeError:
traceback.print_exc(file=sys.stderr)
try:
prompt = prompt.decode("utf-8")
except UnicodeDecodeError:
prompt = ""
else:
prompt = prompt.decode(sys.stdout.encoding)
try:
line = self.readline_hook(prompt)
except KeyboardInterrupt:
return 0
else:
return new_zero_terminated_string(line.encode(sys.stdin.encoding))
except:
self.restore_original()
print("Internal win_unicode_console error, disabling custom readline hook...", file=sys.stderr)
traceback.print_exc(file=sys.stderr)
return new_zero_terminated_string(b"\n")
def install_hook(self, hook):
self.readline_hook = hook
PyOS_ReadlineFunctionPointer.value = self.address
def restore_original(self):
self.readline_hook = None
PyOS_ReadlineFunctionPointer.value = self.original_address
class PyReadlineManager:
def __init__(self):
self.original_codepage = pyreadline.unicode_helper.pyreadline_codepage
def set_codepage(self, codepage):
pyreadline.unicode_helper.pyreadline_codepage = codepage
def restore_original(self):
self.set_codepage(self.original_codepage)
def pyreadline_is_active():
if not pyreadline:
return False
ref = pyreadline.console.console.readline_ref
if ref is None:
return False
return cast(ref, c_void_p).value == PyOS_ReadlineFunctionPointer.value
manager = ReadlineHookManager()
if pyreadline:
pyreadline_manager = PyReadlineManager()
# PY3 # def enable(*, use_pyreadline=True):
def enable(use_pyreadline=True):
check_encodings()
if use_pyreadline and pyreadline:
pyreadline_manager.set_codepage(sys.stdin.encoding)
# pyreadline assumes that encoding of all sys.stdio objects is the same
if not pyreadline_is_active():
manager.install_hook(stdio_readline)
else:
manager.install_hook(stdio_readline)
def disable():
if pyreadline:
pyreadline_manager.restore_original()
else:
manager.restore_original()
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