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# Copyright (C) 2009, 2010 Roman Zimbelmann <romanz@lavabit.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
import copy
import curses.ascii
PY3 = sys.version > '3'
digits = set(range(ord('0'), ord('9')+1))
# Arbitrary numbers which are not used with curses.KEY_XYZ
ANYKEY, PASSIVE_ACTION, ALT_KEY, QUANT_KEY = range(9001, 9005)
special_keys = {
'bs': curses.KEY_BACKSPACE,
'backspace': curses.KEY_BACKSPACE,
'backspace2': curses.ascii.DEL,
'delete': curses.KEY_DC,
'insert': curses.KEY_IC,
'cr': ord("\n"),
'enter': ord("\n"),
'return': ord("\n"),
'space': ord(" "),
'esc': curses.ascii.ESC,
'escape': curses.ascii.ESC,
'down': curses.KEY_DOWN,
'up': curses.KEY_UP,
'left': curses.KEY_LEFT,
'right': curses.KEY_RIGHT,
'pagedown': curses.KEY_NPAGE,
'pageup': curses.KEY_PPAGE,
'home': curses.KEY_HOME,
'end': curses.KEY_END,
'tab': ord('\t'),
's-tab': curses.KEY_BTAB,
}
very_special_keys = {
'any': ANYKEY,
'bg': PASSIVE_ACTION,
'allow_quantifiers': QUANT_KEY,
}
for key, val in tuple(special_keys.items()):
special_keys['a-' + key] = (ALT_KEY, val)
for char in 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789':
special_keys['a-' + char] = (ALT_KEY, ord(char))
for char in 'abcdefghijklmnopqrstuvwxyz':
special_keys['c-' + char] = ord(char) - 96
for n in range(64):
special_keys['f' + str(n)] = curses.KEY_F0 + n
special_keys.update(very_special_keys)
def parse_keybinding(obj):
"""
Translate a keybinding to a sequence of integers
Example:
lol<CR> => (ord('l'), ord('o'), ord('l'), ord('\\n'))
=> (108, 111, 108, 10)
x<A-Left> => (120, (27, curses.KEY_LEFT))
"""
assert isinstance(obj, (tuple, int, str))
if isinstance(obj, tuple):
for char in obj:
yield char
elif isinstance(obj, int):
yield obj
elif isinstance(obj, str):
in_brackets = False
bracket_content = None
for char in obj:
if in_brackets:
if char == '>':
in_brackets = False
string = ''.join(bracket_content).lower()
try:
keys = special_keys[string]
for key in keys:
yield key
except KeyError:
yield ord('<')
for c in bracket_content:
yield ord(c)
yield ord('>')
except TypeError:
yield keys # it was no tuple, just an int
else:
bracket_content.append(char)
else:
if char == '<':
in_brackets = True
bracket_content = []
else:
yield ord(char)
if in_brackets:
yield ord('<')
for c in bracket_content:
yield ord(c)
def construct_keybinding(iterable):
"""
Does the reverse of parse_keybinding
"""
result = []
for c in iterable:
result.append(key_to_string(c))
return ''.join(result)
def key_to_string(key):
return chr(key) if key in range(32, 127) else '?'
def _unbind_traverse(pointer, keys, pos=0):
if keys[pos] not in pointer:
return
if len(keys) > pos+1 and isinstance(pointer, dict):
_unbind_traverse(pointer[keys[pos]], keys, pos=pos+1)
if not pointer[keys[pos]]:
del pointer[keys[pos]]
elif len(keys) == pos+1:
try:
del pointer[keys[pos]]
keys.pop()
except:
pass
class KeyMaps(dict):
def __init__(self, keybuffer=None):
dict.__init__(self)
self.keybuffer = keybuffer
self.used_keymap = None
def use_keymap(self, keymap_name):
self.keybuffer.keymap = self.get(keymap_name, dict())
if self.used_keymap != keymap_name:
self.used_keymap = keymap_name
self.keybuffer.clear()
def _clean_input(self, context, keys):
try:
pointer = self[context]
except:
self[context] = pointer = dict()
if PY3:
keys = keys.encode('utf-8').decode('latin-1')
return list(parse_keybinding(keys)), pointer
def bind(self, context, keys, leaf):
keys, pointer = self._clean_input(context, keys)
if not keys:
return
last_key = keys[-1]
for key in keys[:-1]:
try:
if isinstance(pointer[key], dict):
pointer = pointer[key]
else:
pointer[key] = pointer = dict()
except:
pointer[key] = pointer = dict()
pointer[last_key] = leaf
def copy(self, context, source, target):
clean_source, pointer = self._clean_input(context, source)
if not source:
return
for key in clean_source:
try:
pointer = pointer[key]
except:
raise KeyError("Tried to copy the keybinding `%s',"
" but it was not found." % source)
self.bind(context, target, copy.deepcopy(pointer))
def unbind(self, context, keys):
keys, pointer = self._clean_input(context, keys)
if not keys:
return
_unbind_traverse(pointer, keys)
class KeyBuffer(object):
any_key = ANYKEY
passive_key = PASSIVE_ACTION
quantifier_key = QUANT_KEY
exclude_from_anykey = [27]
def __init__(self, keymap=None):
self.keymap = keymap
self.clear()
def clear(self):
self.keys = []
self.wildcards = []
self.pointer = self.keymap
self.result = None
self.quantifier = None
self.finished_parsing_quantifier = False
self.finished_parsing = False
self.parse_error = False
if self.keymap and self.quantifier_key in self.keymap:
if self.keymap[self.quantifier_key] == 'false':
self.finished_parsing_quantifier = True
def add(self, key):
self.keys.append(key)
self.result = None
if not self.finished_parsing_quantifier and key in digits:
if self.quantifier is None:
self.quantifier = 0
self.quantifier = self.quantifier * 10 + key - 48 # (48 = ord(0))
else:
self.finished_parsing_quantifier = True
moved = True
if key in self.pointer:
self.pointer = self.pointer[key]
elif self.any_key in self.pointer and \
key not in self.exclude_from_anykey:
self.wildcards.append(key)
self.pointer = self.pointer[self.any_key]
else:
moved = False
if moved:
if isinstance(self.pointer, dict):
if self.passive_key in self.pointer:
self.result = self.pointer[self.passive_key]
else:
self.result = self.pointer
self.finished_parsing = True
else:
self.finished_parsing = True
self.parse_error = True
def __str__(self):
return "".join("{0:c}".format(c) for c in self.keys)
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