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# Copyright 2000-2008 Michael Hudson-Doyle <micahel@gmail.com>
# 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.
"""
Keymap contains functions for parsing keyspecs and turning keyspecs into
appropriate sequences.
A keyspec is a string representing a sequence of key presses that can
be bound to a command. All characters other than the backslash represent
themselves. In the traditional manner, a backslash introduces an escape
sequence.
pyrepl uses its own keyspec format that is meant to be a strict superset of
readline's KEYSEQ format. This means that if a spec is found that readline
accepts that this doesn't, it should be logged as a bug. Note that this means
we're using the `\\C-o' style of readline's keyspec, not the `Control-o' sort.
The extension to readline is that the sequence \\<KEY> denotes the
sequence of characters produced by hitting KEY.
Examples:
`a' - what you get when you hit the `a' key
`\\EOA' - Escape - O - A (up, on my terminal)
`\\<UP>' - the up arrow key
`\\<up>' - ditto (keynames are case-insensitive)
`\\C-o', `\\c-o' - control-o
`\\M-.' - meta-period
`\\E.' - ditto (that's how meta works for pyrepl)
`\\<tab>', `\\<TAB>', `\\t', `\\011', '\\x09', '\\X09', '\\C-i', '\\C-I'
- all of these are the tab character.
"""
_escapes = {
"\\": "\\",
"'": "'",
'"': '"',
"a": "\a",
"b": "\b",
"e": "\033",
"f": "\f",
"n": "\n",
"r": "\r",
"t": "\t",
"v": "\v",
}
_keynames = {
"backspace": "backspace",
"delete": "delete",
"down": "down",
"end": "end",
"enter": "\r",
"escape": "\033",
"f1": "f1",
"f2": "f2",
"f3": "f3",
"f4": "f4",
"f5": "f5",
"f6": "f6",
"f7": "f7",
"f8": "f8",
"f9": "f9",
"f10": "f10",
"f11": "f11",
"f12": "f12",
"f13": "f13",
"f14": "f14",
"f15": "f15",
"f16": "f16",
"f17": "f17",
"f18": "f18",
"f19": "f19",
"f20": "f20",
"home": "home",
"insert": "insert",
"left": "left",
"page down": "page down",
"page up": "page up",
"return": "\r",
"right": "right",
"space": " ",
"tab": "\t",
"up": "up",
}
class KeySpecError(Exception):
pass
def parse_keys(keys: str) -> list[str]:
"""Parse keys in keyspec format to a sequence of keys."""
s = 0
r: list[str] = []
while s < len(keys):
k, s = _parse_single_key_sequence(keys, s)
r.extend(k)
return r
def _parse_single_key_sequence(key: str, s: int) -> tuple[list[str], int]:
ctrl = 0
meta = 0
ret = ""
while not ret and s < len(key):
if key[s] == "\\":
c = key[s + 1].lower()
if c in _escapes:
ret = _escapes[c]
s += 2
elif c == "c":
if key[s + 2] != "-":
raise KeySpecError(
"\\C must be followed by `-' (char %d of %s)"
% (s + 2, repr(key))
)
if ctrl:
raise KeySpecError(
"doubled \\C- (char %d of %s)" % (s + 1, repr(key))
)
ctrl = 1
s += 3
elif c == "m":
if key[s + 2] != "-":
raise KeySpecError(
"\\M must be followed by `-' (char %d of %s)"
% (s + 2, repr(key))
)
if meta:
raise KeySpecError(
"doubled \\M- (char %d of %s)" % (s + 1, repr(key))
)
meta = 1
s += 3
elif c.isdigit():
n = key[s + 1 : s + 4]
ret = chr(int(n, 8))
s += 4
elif c == "x":
n = key[s + 2 : s + 4]
ret = chr(int(n, 16))
s += 4
elif c == "<":
t = key.find(">", s)
if t == -1:
raise KeySpecError(
"unterminated \\< starting at char %d of %s"
% (s + 1, repr(key))
)
ret = key[s + 2 : t].lower()
if ret not in _keynames:
raise KeySpecError(
"unrecognised keyname `%s' at char %d of %s"
% (ret, s + 2, repr(key))
)
ret = _keynames[ret]
s = t + 1
else:
raise KeySpecError(
"unknown backslash escape %s at char %d of %s"
% (repr(c), s + 2, repr(key))
)
else:
ret = key[s]
s += 1
if ctrl:
if len(ret) == 1:
ret = chr(ord(ret) & 0x1F) # curses.ascii.ctrl()
elif ret in {"left", "right"}:
ret = f"ctrl {ret}"
else:
raise KeySpecError("\\C- followed by invalid key")
result = [ret], s
if meta:
result[0].insert(0, "\033")
return result
def compile_keymap(keymap, empty=b""):
r = {}
for key, value in keymap.items():
if isinstance(key, bytes):
first = key[:1]
else:
first = key[0]
r.setdefault(first, {})[key[1:]] = value
for key, value in r.items():
if empty in value:
if len(value) != 1:
raise KeySpecError("key definitions for %s clash" % (value.values(),))
else:
r[key] = value[empty]
else:
r[key] = compile_keymap(value, empty)
return r
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