mirror of https://github.com/python/cpython
761 lines
23 KiB
Python
761 lines
23 KiB
Python
# Copyright 2000-2010 Michael Hudson-Doyle <micahel@gmail.com>
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# Antonio Cuni
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# Armin Rigo
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#
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# All Rights Reserved
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#
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#
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# Permission to use, copy, modify, and distribute this software and
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# its documentation for any purpose is hereby granted without fee,
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# provided that the above copyright notice appear in all copies and
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# that both that copyright notice and this permission notice appear in
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# supporting documentation.
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#
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# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO
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# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
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# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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from __future__ import annotations
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import errno
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import os
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import re
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import select
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import signal
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import struct
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import sys
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import termios
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import time
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from fcntl import ioctl
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from . import curses
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from .console import Console, Event
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from .fancy_termios import tcgetattr, tcsetattr
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from .trace import trace
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from .unix_eventqueue import EventQueue
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from .utils import wlen
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TYPE_CHECKING = False
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# types
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if TYPE_CHECKING:
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from typing import IO, Literal, overload
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else:
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overload = lambda func: None
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class InvalidTerminal(RuntimeError):
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pass
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_error = (termios.error, curses.error, InvalidTerminal)
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SIGWINCH_EVENT = "repaint"
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FIONREAD = getattr(termios, "FIONREAD", None)
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TIOCGWINSZ = getattr(termios, "TIOCGWINSZ", None)
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# ------------ start of baudrate definitions ------------
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# Add (possibly) missing baudrates (check termios man page) to termios
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def add_baudrate_if_supported(dictionary: dict[int, int], rate: int) -> None:
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baudrate_name = "B%d" % rate
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if hasattr(termios, baudrate_name):
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dictionary[getattr(termios, baudrate_name)] = rate
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# Check the termios man page (Line speed) to know where these
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# values come from.
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potential_baudrates = [
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0,
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110,
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115200,
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1200,
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134,
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150,
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1800,
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19200,
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200,
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230400,
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2400,
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300,
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38400,
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460800,
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4800,
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50,
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57600,
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600,
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75,
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9600,
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]
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ratedict: dict[int, int] = {}
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for rate in potential_baudrates:
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add_baudrate_if_supported(ratedict, rate)
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# Clean up variables to avoid unintended usage
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del rate, add_baudrate_if_supported
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# ------------ end of baudrate definitions ------------
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delayprog = re.compile(b"\\$<([0-9]+)((?:/|\\*){0,2})>")
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try:
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poll: type[select.poll] = select.poll
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except AttributeError:
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# this is exactly the minumum necessary to support what we
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# do with poll objects
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class MinimalPoll:
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def __init__(self):
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pass
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def register(self, fd, flag):
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self.fd = fd
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def poll(self): # note: a 'timeout' argument would be *milliseconds*
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r, w, e = select.select([self.fd], [], [])
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return r
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poll = MinimalPoll # type: ignore[assignment]
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class UnixConsole(Console):
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def __init__(
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self,
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f_in: IO[bytes] | int = 0,
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f_out: IO[bytes] | int = 1,
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term: str = "",
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encoding: str = "",
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):
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"""
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Initialize the UnixConsole.
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Parameters:
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- f_in (int or file-like object): Input file descriptor or object.
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- f_out (int or file-like object): Output file descriptor or object.
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- term (str): Terminal name.
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- encoding (str): Encoding to use for I/O operations.
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"""
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super().__init__(f_in, f_out, term, encoding)
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self.pollob = poll()
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self.pollob.register(self.input_fd, select.POLLIN)
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curses.setupterm(term or None, self.output_fd)
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self.term = term
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@overload
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def _my_getstr(cap: str, optional: Literal[False] = False) -> bytes: ...
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@overload
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def _my_getstr(cap: str, optional: bool) -> bytes | None: ...
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def _my_getstr(cap: str, optional: bool = False) -> bytes | None:
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r = curses.tigetstr(cap)
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if not optional and r is None:
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raise InvalidTerminal(
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f"terminal doesn't have the required {cap} capability"
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)
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return r
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self._bel = _my_getstr("bel")
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self._civis = _my_getstr("civis", optional=True)
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self._clear = _my_getstr("clear")
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self._cnorm = _my_getstr("cnorm", optional=True)
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self._cub = _my_getstr("cub", optional=True)
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self._cub1 = _my_getstr("cub1", optional=True)
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self._cud = _my_getstr("cud", optional=True)
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self._cud1 = _my_getstr("cud1", optional=True)
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self._cuf = _my_getstr("cuf", optional=True)
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self._cuf1 = _my_getstr("cuf1", optional=True)
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self._cup = _my_getstr("cup")
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self._cuu = _my_getstr("cuu", optional=True)
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self._cuu1 = _my_getstr("cuu1", optional=True)
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self._dch1 = _my_getstr("dch1", optional=True)
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self._dch = _my_getstr("dch", optional=True)
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self._el = _my_getstr("el")
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self._hpa = _my_getstr("hpa", optional=True)
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self._ich = _my_getstr("ich", optional=True)
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self._ich1 = _my_getstr("ich1", optional=True)
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self._ind = _my_getstr("ind", optional=True)
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self._pad = _my_getstr("pad", optional=True)
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self._ri = _my_getstr("ri", optional=True)
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self._rmkx = _my_getstr("rmkx", optional=True)
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self._smkx = _my_getstr("smkx", optional=True)
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self.__setup_movement()
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self.event_queue = EventQueue(self.input_fd, self.encoding)
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self.cursor_visible = 1
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def change_encoding(self, encoding: str) -> None:
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"""
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Change the encoding used for I/O operations.
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Parameters:
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- encoding (str): New encoding to use.
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"""
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self.encoding = encoding
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def refresh(self, screen, c_xy):
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"""
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Refresh the console screen.
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Parameters:
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- screen (list): List of strings representing the screen contents.
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- c_xy (tuple): Cursor position (x, y) on the screen.
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"""
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cx, cy = c_xy
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if not self.__gone_tall:
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while len(self.screen) < min(len(screen), self.height):
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self.__hide_cursor()
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self.__move(0, len(self.screen) - 1)
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self.__write("\n")
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self.__posxy = 0, len(self.screen)
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self.screen.append("")
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else:
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while len(self.screen) < len(screen):
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self.screen.append("")
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if len(screen) > self.height:
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self.__gone_tall = 1
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self.__move = self.__move_tall
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px, py = self.__posxy
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old_offset = offset = self.__offset
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height = self.height
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# we make sure the cursor is on the screen, and that we're
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# using all of the screen if we can
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if cy < offset:
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offset = cy
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elif cy >= offset + height:
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offset = cy - height + 1
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elif offset > 0 and len(screen) < offset + height:
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offset = max(len(screen) - height, 0)
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screen.append("")
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oldscr = self.screen[old_offset : old_offset + height]
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newscr = screen[offset : offset + height]
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# use hardware scrolling if we have it.
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if old_offset > offset and self._ri:
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self.__hide_cursor()
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self.__write_code(self._cup, 0, 0)
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self.__posxy = 0, old_offset
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for i in range(old_offset - offset):
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self.__write_code(self._ri)
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oldscr.pop(-1)
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oldscr.insert(0, "")
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elif old_offset < offset and self._ind:
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self.__hide_cursor()
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self.__write_code(self._cup, self.height - 1, 0)
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self.__posxy = 0, old_offset + self.height - 1
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for i in range(offset - old_offset):
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self.__write_code(self._ind)
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oldscr.pop(0)
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oldscr.append("")
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self.__offset = offset
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for (
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y,
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oldline,
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newline,
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) in zip(range(offset, offset + height), oldscr, newscr):
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if oldline != newline:
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self.__write_changed_line(y, oldline, newline, px)
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y = len(newscr)
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while y < len(oldscr):
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self.__hide_cursor()
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self.__move(0, y)
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self.__posxy = 0, y
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self.__write_code(self._el)
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y += 1
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self.__show_cursor()
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self.screen = screen.copy()
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self.move_cursor(cx, cy)
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self.flushoutput()
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def move_cursor(self, x, y):
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"""
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Move the cursor to the specified position on the screen.
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Parameters:
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- x (int): X coordinate.
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- y (int): Y coordinate.
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"""
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if y < self.__offset or y >= self.__offset + self.height:
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self.event_queue.insert(Event("scroll", None))
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else:
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self.__move(x, y)
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self.__posxy = x, y
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self.flushoutput()
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def prepare(self):
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"""
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Prepare the console for input/output operations.
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"""
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self.__svtermstate = tcgetattr(self.input_fd)
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raw = self.__svtermstate.copy()
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raw.iflag &= ~(termios.BRKINT | termios.INPCK | termios.ISTRIP | termios.IXON)
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raw.oflag &= ~(termios.OPOST)
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raw.cflag &= ~(termios.CSIZE | termios.PARENB)
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raw.cflag |= termios.CS8
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raw.lflag &= ~(
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termios.ICANON | termios.ECHO | termios.IEXTEN | (termios.ISIG * 1)
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)
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raw.cc[termios.VMIN] = 1
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raw.cc[termios.VTIME] = 0
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tcsetattr(self.input_fd, termios.TCSADRAIN, raw)
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self.screen = []
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self.height, self.width = self.getheightwidth()
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self.__buffer = []
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self.__posxy = 0, 0
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self.__gone_tall = 0
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self.__move = self.__move_short
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self.__offset = 0
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self.__maybe_write_code(self._smkx)
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try:
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self.old_sigwinch = signal.signal(signal.SIGWINCH, self.__sigwinch)
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except ValueError:
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pass
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self.__enable_bracketed_paste()
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def restore(self):
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"""
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Restore the console to the default state
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"""
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self.__disable_bracketed_paste()
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self.__maybe_write_code(self._rmkx)
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self.flushoutput()
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tcsetattr(self.input_fd, termios.TCSADRAIN, self.__svtermstate)
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if hasattr(self, "old_sigwinch"):
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signal.signal(signal.SIGWINCH, self.old_sigwinch)
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del self.old_sigwinch
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def push_char(self, char: int | bytes) -> None:
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"""
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Push a character to the console event queue.
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"""
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trace("push char {char!r}", char=char)
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self.event_queue.push(char)
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def get_event(self, block: bool = True) -> Event | None:
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"""
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Get an event from the console event queue.
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Parameters:
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- block (bool): Whether to block until an event is available.
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Returns:
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- Event: Event object from the event queue.
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"""
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while self.event_queue.empty():
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while True:
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try:
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self.push_char(os.read(self.input_fd, 1))
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except OSError as err:
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if err.errno == errno.EINTR:
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if not self.event_queue.empty():
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return self.event_queue.get()
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else:
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continue
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else:
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raise
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else:
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break
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if not block:
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break
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return self.event_queue.get()
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def wait(self):
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"""
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Wait for events on the console.
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"""
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self.pollob.poll()
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def set_cursor_vis(self, visible):
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"""
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Set the visibility of the cursor.
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Parameters:
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- visible (bool): Visibility flag.
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"""
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if visible:
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self.__show_cursor()
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else:
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self.__hide_cursor()
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if TIOCGWINSZ:
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def getheightwidth(self):
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"""
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Get the height and width of the console.
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Returns:
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- tuple: Height and width of the console.
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"""
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try:
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return int(os.environ["LINES"]), int(os.environ["COLUMNS"])
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except KeyError:
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height, width = struct.unpack(
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"hhhh", ioctl(self.input_fd, TIOCGWINSZ, b"\000" * 8)
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)[0:2]
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if not height:
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return 25, 80
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return height, width
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else:
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def getheightwidth(self):
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"""
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Get the height and width of the console.
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Returns:
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- tuple: Height and width of the console.
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"""
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try:
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return int(os.environ["LINES"]), int(os.environ["COLUMNS"])
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except KeyError:
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return 25, 80
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def forgetinput(self):
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"""
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Discard any pending input on the console.
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"""
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termios.tcflush(self.input_fd, termios.TCIFLUSH)
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def flushoutput(self):
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"""
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Flush the output buffer.
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"""
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for text, iscode in self.__buffer:
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if iscode:
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self.__tputs(text)
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else:
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os.write(self.output_fd, text.encode(self.encoding, "replace"))
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del self.__buffer[:]
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def finish(self):
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"""
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Finish console operations and flush the output buffer.
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"""
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y = len(self.screen) - 1
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while y >= 0 and not self.screen[y]:
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y -= 1
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self.__move(0, min(y, self.height + self.__offset - 1))
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self.__write("\n\r")
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self.flushoutput()
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def beep(self):
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"""
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Emit a beep sound.
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"""
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self.__maybe_write_code(self._bel)
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self.flushoutput()
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if FIONREAD:
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def getpending(self):
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"""
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Get pending events from the console event queue.
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Returns:
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- Event: Pending event from the event queue.
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"""
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e = Event("key", "", b"")
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while not self.event_queue.empty():
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e2 = self.event_queue.get()
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e.data += e2.data
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e.raw += e.raw
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amount = struct.unpack("i", ioctl(self.input_fd, FIONREAD, b"\0\0\0\0"))[0]
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raw = os.read(self.input_fd, amount)
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data = str(raw, self.encoding, "replace")
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e.data += data
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e.raw += raw
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return e
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else:
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def getpending(self):
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"""
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Get pending events from the console event queue.
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Returns:
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- Event: Pending event from the event queue.
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"""
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e = Event("key", "", b"")
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while not self.event_queue.empty():
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e2 = self.event_queue.get()
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e.data += e2.data
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e.raw += e.raw
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amount = 10000
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raw = os.read(self.input_fd, amount)
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data = str(raw, self.encoding, "replace")
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e.data += data
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e.raw += raw
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return e
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def clear(self):
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"""
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Clear the console screen.
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"""
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self.__write_code(self._clear)
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self.__gone_tall = 1
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self.__move = self.__move_tall
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self.__posxy = 0, 0
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self.screen = []
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def __enable_bracketed_paste(self) -> None:
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os.write(self.output_fd, b"\x1b[?2004h")
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def __disable_bracketed_paste(self) -> None:
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os.write(self.output_fd, b"\x1b[?2004l")
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def __setup_movement(self):
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"""
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Set up the movement functions based on the terminal capabilities.
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"""
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if 0 and self._hpa: # hpa don't work in windows telnet :-(
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self.__move_x = self.__move_x_hpa
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elif self._cub and self._cuf:
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self.__move_x = self.__move_x_cub_cuf
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elif self._cub1 and self._cuf1:
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self.__move_x = self.__move_x_cub1_cuf1
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else:
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raise RuntimeError("insufficient terminal (horizontal)")
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if self._cuu and self._cud:
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self.__move_y = self.__move_y_cuu_cud
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elif self._cuu1 and self._cud1:
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self.__move_y = self.__move_y_cuu1_cud1
|
|
else:
|
|
raise RuntimeError("insufficient terminal (vertical)")
|
|
|
|
if self._dch1:
|
|
self.dch1 = self._dch1
|
|
elif self._dch:
|
|
self.dch1 = curses.tparm(self._dch, 1)
|
|
else:
|
|
self.dch1 = None
|
|
|
|
if self._ich1:
|
|
self.ich1 = self._ich1
|
|
elif self._ich:
|
|
self.ich1 = curses.tparm(self._ich, 1)
|
|
else:
|
|
self.ich1 = None
|
|
|
|
self.__move = self.__move_short
|
|
|
|
def __write_changed_line(self, y, oldline, newline, px_coord):
|
|
# this is frustrating; there's no reason to test (say)
|
|
# self.dch1 inside the loop -- but alternative ways of
|
|
# structuring this function are equally painful (I'm trying to
|
|
# avoid writing code generators these days...)
|
|
minlen = min(wlen(oldline), wlen(newline))
|
|
x_pos = 0
|
|
x_coord = 0
|
|
|
|
px_pos = 0
|
|
j = 0
|
|
for c in oldline:
|
|
if j >= px_coord:
|
|
break
|
|
j += wlen(c)
|
|
px_pos += 1
|
|
|
|
# reuse the oldline as much as possible, but stop as soon as we
|
|
# encounter an ESCAPE, because it might be the start of an escape
|
|
# sequene
|
|
while (
|
|
x_coord < minlen
|
|
and oldline[x_pos] == newline[x_pos]
|
|
and newline[x_pos] != "\x1b"
|
|
):
|
|
x_coord += wlen(newline[x_pos])
|
|
x_pos += 1
|
|
|
|
# if we need to insert a single character right after the first detected change
|
|
if oldline[x_pos:] == newline[x_pos + 1 :] and self.ich1:
|
|
if (
|
|
y == self.__posxy[1]
|
|
and x_coord > self.__posxy[0]
|
|
and oldline[px_pos:x_pos] == newline[px_pos + 1 : x_pos + 1]
|
|
):
|
|
x_pos = px_pos
|
|
x_coord = px_coord
|
|
character_width = wlen(newline[x_pos])
|
|
self.__move(x_coord, y)
|
|
self.__write_code(self.ich1)
|
|
self.__write(newline[x_pos])
|
|
self.__posxy = x_coord + character_width, y
|
|
|
|
# if it's a single character change in the middle of the line
|
|
elif (
|
|
x_coord < minlen
|
|
and oldline[x_pos + 1 :] == newline[x_pos + 1 :]
|
|
and wlen(oldline[x_pos]) == wlen(newline[x_pos])
|
|
):
|
|
character_width = wlen(newline[x_pos])
|
|
self.__move(x_coord, y)
|
|
self.__write(newline[x_pos])
|
|
self.__posxy = x_coord + character_width, y
|
|
|
|
# if this is the last character to fit in the line and we edit in the middle of the line
|
|
elif (
|
|
self.dch1
|
|
and self.ich1
|
|
and wlen(newline) == self.width
|
|
and x_coord < wlen(newline) - 2
|
|
and newline[x_pos + 1 : -1] == oldline[x_pos:-2]
|
|
):
|
|
self.__hide_cursor()
|
|
self.__move(self.width - 2, y)
|
|
self.__posxy = self.width - 2, y
|
|
self.__write_code(self.dch1)
|
|
|
|
character_width = wlen(newline[x_pos])
|
|
self.__move(x_coord, y)
|
|
self.__write_code(self.ich1)
|
|
self.__write(newline[x_pos])
|
|
self.__posxy = character_width + 1, y
|
|
|
|
else:
|
|
self.__hide_cursor()
|
|
self.__move(x_coord, y)
|
|
if wlen(oldline) > wlen(newline):
|
|
self.__write_code(self._el)
|
|
self.__write(newline[x_pos:])
|
|
self.__posxy = wlen(newline), y
|
|
|
|
if "\x1b" in newline:
|
|
# ANSI escape characters are present, so we can't assume
|
|
# anything about the position of the cursor. Moving the cursor
|
|
# to the left margin should work to get to a known position.
|
|
self.move_cursor(0, y)
|
|
|
|
def __write(self, text):
|
|
self.__buffer.append((text, 0))
|
|
|
|
def __write_code(self, fmt, *args):
|
|
self.__buffer.append((curses.tparm(fmt, *args), 1))
|
|
|
|
def __maybe_write_code(self, fmt, *args):
|
|
if fmt:
|
|
self.__write_code(fmt, *args)
|
|
|
|
def __move_y_cuu1_cud1(self, y):
|
|
dy = y - self.__posxy[1]
|
|
if dy > 0:
|
|
self.__write_code(dy * self._cud1)
|
|
elif dy < 0:
|
|
self.__write_code((-dy) * self._cuu1)
|
|
|
|
def __move_y_cuu_cud(self, y):
|
|
dy = y - self.__posxy[1]
|
|
if dy > 0:
|
|
self.__write_code(self._cud, dy)
|
|
elif dy < 0:
|
|
self.__write_code(self._cuu, -dy)
|
|
|
|
def __move_x_hpa(self, x: int) -> None:
|
|
if x != self.__posxy[0]:
|
|
self.__write_code(self._hpa, x)
|
|
|
|
def __move_x_cub1_cuf1(self, x: int) -> None:
|
|
dx = x - self.__posxy[0]
|
|
if dx > 0:
|
|
self.__write_code(self._cuf1 * dx)
|
|
elif dx < 0:
|
|
self.__write_code(self._cub1 * (-dx))
|
|
|
|
def __move_x_cub_cuf(self, x: int) -> None:
|
|
dx = x - self.__posxy[0]
|
|
if dx > 0:
|
|
self.__write_code(self._cuf, dx)
|
|
elif dx < 0:
|
|
self.__write_code(self._cub, -dx)
|
|
|
|
def __move_short(self, x, y):
|
|
self.__move_x(x)
|
|
self.__move_y(y)
|
|
|
|
def __move_tall(self, x, y):
|
|
assert 0 <= y - self.__offset < self.height, y - self.__offset
|
|
self.__write_code(self._cup, y - self.__offset, x)
|
|
|
|
def __sigwinch(self, signum, frame):
|
|
self.height, self.width = self.getheightwidth()
|
|
self.event_queue.insert(Event("resize", None))
|
|
|
|
def __hide_cursor(self):
|
|
if self.cursor_visible:
|
|
self.__maybe_write_code(self._civis)
|
|
self.cursor_visible = 0
|
|
|
|
def __show_cursor(self):
|
|
if not self.cursor_visible:
|
|
self.__maybe_write_code(self._cnorm)
|
|
self.cursor_visible = 1
|
|
|
|
def repaint(self):
|
|
if not self.__gone_tall:
|
|
self.__posxy = 0, self.__posxy[1]
|
|
self.__write("\r")
|
|
ns = len(self.screen) * ["\000" * self.width]
|
|
self.screen = ns
|
|
else:
|
|
self.__posxy = 0, self.__offset
|
|
self.__move(0, self.__offset)
|
|
ns = self.height * ["\000" * self.width]
|
|
self.screen = ns
|
|
|
|
def __tputs(self, fmt, prog=delayprog):
|
|
"""A Python implementation of the curses tputs function; the
|
|
curses one can't really be wrapped in a sane manner.
|
|
|
|
I have the strong suspicion that this is complexity that
|
|
will never do anyone any good."""
|
|
# using .get() means that things will blow up
|
|
# only if the bps is actually needed (which I'm
|
|
# betting is pretty unlkely)
|
|
bps = ratedict.get(self.__svtermstate.ospeed)
|
|
while 1:
|
|
m = prog.search(fmt)
|
|
if not m:
|
|
os.write(self.output_fd, fmt)
|
|
break
|
|
x, y = m.span()
|
|
os.write(self.output_fd, fmt[:x])
|
|
fmt = fmt[y:]
|
|
delay = int(m.group(1))
|
|
if b"*" in m.group(2):
|
|
delay *= self.height
|
|
if self._pad and bps is not None:
|
|
nchars = (bps * delay) / 1000
|
|
os.write(self.output_fd, self._pad * nchars)
|
|
else:
|
|
time.sleep(float(delay) / 1000.0)
|