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-rw-r--r--Lib/_pyrepl/commands.py464
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diff --git a/Lib/_pyrepl/commands.py b/Lib/_pyrepl/commands.py
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+# Copyright 2000-2010 Michael Hudson-Doyle <micahel@gmail.com>
+# Antonio Cuni
+# Armin Rigo
+#
+# All Rights Reserved
+#
+#
+# Permission to use, copy, modify, and distribute this software and
+# its documentation for any purpose is hereby granted without fee,
+# provided that the above copyright notice appear in all copies and
+# that both that copyright notice and this permission notice appear in
+# supporting documentation.
+#
+# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO
+# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
+# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+from __future__ import annotations
+import os
+
+# Categories of actions:
+# killing
+# yanking
+# motion
+# editing
+# history
+# finishing
+# [completion]
+
+
+# types
+if False:
+ from .reader import Reader
+ from .historical_reader import HistoricalReader
+ from .console import Event
+
+
+class Command:
+ finish: bool = False
+ kills_digit_arg: bool = True
+
+ def __init__(
+ self, reader: HistoricalReader, event_name: str, event: list[str]
+ ) -> None:
+ # Reader should really be "any reader" but there's too much usage of
+ # HistoricalReader methods and fields in the code below for us to
+ # refactor at the moment.
+
+ self.reader = reader
+ self.event = event
+ self.event_name = event_name
+
+ def do(self) -> None:
+ pass
+
+
+class KillCommand(Command):
+ def kill_range(self, start: int, end: int) -> None:
+ if start == end:
+ return
+ r = self.reader
+ b = r.buffer
+ text = b[start:end]
+ del b[start:end]
+ if is_kill(r.last_command):
+ if start < r.pos:
+ r.kill_ring[-1] = text + r.kill_ring[-1]
+ else:
+ r.kill_ring[-1] = r.kill_ring[-1] + text
+ else:
+ r.kill_ring.append(text)
+ r.pos = start
+ r.dirty = True
+
+
+class YankCommand(Command):
+ pass
+
+
+class MotionCommand(Command):
+ pass
+
+
+class EditCommand(Command):
+ pass
+
+
+class FinishCommand(Command):
+ finish = True
+ pass
+
+
+def is_kill(command: type[Command] | None) -> bool:
+ return command is not None and issubclass(command, KillCommand)
+
+
+def is_yank(command: type[Command] | None) -> bool:
+ return command is not None and issubclass(command, YankCommand)
+
+
+# etc
+
+
+class digit_arg(Command):
+ kills_digit_arg = False
+
+ def do(self) -> None:
+ r = self.reader
+ c = self.event[-1]
+ if c == "-":
+ if r.arg is not None:
+ r.arg = -r.arg
+ else:
+ r.arg = -1
+ else:
+ d = int(c)
+ if r.arg is None:
+ r.arg = d
+ else:
+ if r.arg < 0:
+ r.arg = 10 * r.arg - d
+ else:
+ r.arg = 10 * r.arg + d
+ r.dirty = True
+
+
+class clear_screen(Command):
+ def do(self) -> None:
+ r = self.reader
+ r.console.clear()
+ r.dirty = True
+
+
+class refresh(Command):
+ def do(self) -> None:
+ self.reader.dirty = True
+
+
+class repaint(Command):
+ def do(self) -> None:
+ self.reader.dirty = True
+ self.reader.console.repaint()
+
+
+class kill_line(KillCommand):
+ def do(self) -> None:
+ r = self.reader
+ b = r.buffer
+ eol = r.eol()
+ for c in b[r.pos : eol]:
+ if not c.isspace():
+ self.kill_range(r.pos, eol)
+ return
+ else:
+ self.kill_range(r.pos, eol + 1)
+
+
+class unix_line_discard(KillCommand):
+ def do(self) -> None:
+ r = self.reader
+ self.kill_range(r.bol(), r.pos)
+
+
+class unix_word_rubout(KillCommand):
+ def do(self) -> None:
+ r = self.reader
+ for i in range(r.get_arg()):
+ self.kill_range(r.bow(), r.pos)
+
+
+class kill_word(KillCommand):
+ def do(self) -> None:
+ r = self.reader
+ for i in range(r.get_arg()):
+ self.kill_range(r.pos, r.eow())
+
+
+class backward_kill_word(KillCommand):
+ def do(self) -> None:
+ r = self.reader
+ for i in range(r.get_arg()):
+ self.kill_range(r.bow(), r.pos)
+
+
+class yank(YankCommand):
+ def do(self) -> None:
+ r = self.reader
+ if not r.kill_ring:
+ r.error("nothing to yank")
+ return
+ r.insert(r.kill_ring[-1])
+
+
+class yank_pop(YankCommand):
+ def do(self) -> None:
+ r = self.reader
+ b = r.buffer
+ if not r.kill_ring:
+ r.error("nothing to yank")
+ return
+ if not is_yank(r.last_command):
+ r.error("previous command was not a yank")
+ return
+ repl = len(r.kill_ring[-1])
+ r.kill_ring.insert(0, r.kill_ring.pop())
+ t = r.kill_ring[-1]
+ b[r.pos - repl : r.pos] = t
+ r.pos = r.pos - repl + len(t)
+ r.dirty = True
+
+
+class interrupt(FinishCommand):
+ def do(self) -> None:
+ import signal
+
+ self.reader.console.finish()
+ os.kill(os.getpid(), signal.SIGINT)
+
+
+class suspend(Command):
+ def do(self) -> None:
+ import signal
+
+ r = self.reader
+ p = r.pos
+ r.console.finish()
+ os.kill(os.getpid(), signal.SIGSTOP)
+ ## this should probably be done
+ ## in a handler for SIGCONT?
+ r.console.prepare()
+ r.pos = p
+ # r.posxy = 0, 0 # XXX this is invalid
+ r.dirty = True
+ r.console.screen = []
+
+
+class up(MotionCommand):
+ def do(self) -> None:
+ r = self.reader
+ for _ in range(r.get_arg()):
+ x, y = r.pos2xy()
+ new_y = y - 1
+
+ if new_y < 0:
+ if r.historyi > 0:
+ r.select_item(r.historyi - 1)
+ return
+ r.pos = 0
+ r.error("start of buffer")
+ return
+
+ if (
+ x
+ > (
+ new_x := r.max_column(new_y)
+ ) # we're past the end of the previous line
+ or x == r.max_column(y)
+ and any(
+ not i.isspace() for i in r.buffer[r.bol() :]
+ ) # move between eols
+ ):
+ x = new_x
+
+ r.setpos_from_xy(x, new_y)
+
+
+class down(MotionCommand):
+ def do(self) -> None:
+ r = self.reader
+ b = r.buffer
+ for _ in range(r.get_arg()):
+ x, y = r.pos2xy()
+ new_y = y + 1
+
+ if new_y > r.max_row():
+ if r.historyi < len(r.history):
+ r.select_item(r.historyi + 1)
+ r.pos = r.eol(0)
+ return
+ r.pos = len(b)
+ r.error("end of buffer")
+ return
+
+ if (
+ x
+ > (
+ new_x := r.max_column(new_y)
+ ) # we're past the end of the previous line
+ or x == r.max_column(y)
+ and any(
+ not i.isspace() for i in r.buffer[r.bol() :]
+ ) # move between eols
+ ):
+ x = new_x
+
+ r.setpos_from_xy(x, new_y)
+
+
+class left(MotionCommand):
+ def do(self) -> None:
+ r = self.reader
+ for i in range(r.get_arg()):
+ p = r.pos - 1
+ if p >= 0:
+ r.pos = p
+ else:
+ self.reader.error("start of buffer")
+
+
+class right(MotionCommand):
+ def do(self) -> None:
+ r = self.reader
+ b = r.buffer
+ for i in range(r.get_arg()):
+ p = r.pos + 1
+ if p <= len(b):
+ r.pos = p
+ else:
+ self.reader.error("end of buffer")
+
+
+class beginning_of_line(MotionCommand):
+ def do(self) -> None:
+ self.reader.pos = self.reader.bol()
+
+
+class end_of_line(MotionCommand):
+ def do(self) -> None:
+ self.reader.pos = self.reader.eol()
+
+
+class home(MotionCommand):
+ def do(self) -> None:
+ self.reader.pos = 0
+
+
+class end(MotionCommand):
+ def do(self) -> None:
+ self.reader.pos = len(self.reader.buffer)
+
+
+class forward_word(MotionCommand):
+ def do(self) -> None:
+ r = self.reader
+ for i in range(r.get_arg()):
+ r.pos = r.eow()
+
+
+class backward_word(MotionCommand):
+ def do(self) -> None:
+ r = self.reader
+ for i in range(r.get_arg()):
+ r.pos = r.bow()
+
+
+class self_insert(EditCommand):
+ def do(self) -> None:
+ r = self.reader
+ r.insert(self.event * r.get_arg())
+
+
+class insert_nl(EditCommand):
+ def do(self) -> None:
+ r = self.reader
+ r.insert("\n" * r.get_arg())
+
+
+class transpose_characters(EditCommand):
+ def do(self) -> None:
+ r = self.reader
+ b = r.buffer
+ s = r.pos - 1
+ if s < 0:
+ r.error("cannot transpose at start of buffer")
+ else:
+ if s == len(b):
+ s -= 1
+ t = min(s + r.get_arg(), len(b) - 1)
+ c = b[s]
+ del b[s]
+ b.insert(t, c)
+ r.pos = t
+ r.dirty = True
+
+
+class backspace(EditCommand):
+ def do(self) -> None:
+ r = self.reader
+ b = r.buffer
+ for i in range(r.get_arg()):
+ if r.pos > 0:
+ r.pos -= 1
+ del b[r.pos]
+ r.dirty = True
+ else:
+ self.reader.error("can't backspace at start")
+
+
+class delete(EditCommand):
+ def do(self) -> None:
+ r = self.reader
+ b = r.buffer
+ if (
+ r.pos == 0
+ and len(b) == 0 # this is something of a hack
+ and self.event[-1] == "\004"
+ ):
+ r.update_screen()
+ r.console.finish()
+ raise EOFError
+ for i in range(r.get_arg()):
+ if r.pos != len(b):
+ del b[r.pos]
+ r.dirty = True
+ else:
+ self.reader.error("end of buffer")
+
+
+class accept(FinishCommand):
+ def do(self) -> None:
+ pass
+
+
+class help(Command):
+ def do(self) -> None:
+ import _sitebuiltins
+
+ with self.reader.suspend():
+ self.reader.msg = _sitebuiltins._Helper()() # type: ignore[assignment, call-arg]
+
+
+class invalid_key(Command):
+ def do(self) -> None:
+ pending = self.reader.console.getpending()
+ s = "".join(self.event) + pending.data
+ self.reader.error("`%r' not bound" % s)
+
+
+class invalid_command(Command):
+ def do(self) -> None:
+ s = self.event_name
+ self.reader.error("command `%s' not known" % s)
+
+
+class show_history(Command):
+ def do(self) -> None:
+ from .pager import get_pager
+ from site import gethistoryfile # type: ignore[attr-defined]
+
+ history = os.linesep.join(self.reader.history[:])
+ with self.reader.suspend():
+ pager = get_pager()
+ pager(history, gethistoryfile())
+
+
+class paste_mode(Command):
+
+ def do(self) -> None:
+ self.reader.paste_mode = not self.reader.paste_mode
+ self.reader.dirty = True
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