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# Copyright (c) 2009, 2010 hut <hut@lavabit.com>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR 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, DIRECT, 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.
import curses
from string import ascii_lowercase
from inspect import isfunction, getargspec
from ranger.ext.tree import Tree
MAX_ALIAS_RECURSION = 20
PASSIVE_ACTION = 9003
DIRKEY = 9001
ANYKEY = 9002
FUNC = 'func'
DIRECTION = 'direction'
DIRARG = 'dir'
ALIASARG = 'alias'
class Direction(object):
"""An object with a down and right method"""
def __init__(self, down=0, right=0):
self.down = down
self.right = right
def copy(self):
new = type(self)()
new.__dict__.update(self.__dict__)
return new
def __mul__(self, other):
copy = self.copy()
if other is not None:
copy.down *= other
copy.right *= other
return copy
__rmul__ = __mul__
def to_string(i):
"""convert a ord'd integer to a string"""
try:
return chr(i)
except ValueError:
return '?'
def is_ascii_digit(n):
return n >= 48 and n <= 57
class CommandArgs(object):
"""The arguments which are passed to a keybinding function"""
def __init__(self, fm, widget, keybuffer):
self.fm = fm
self.wdg = widget
self.keybuffer = keybuffer
self.n = keybuffer.quant
self.direction = keybuffer.directions and keybuffer.directions[0] or None
self.directions = keybuffer.directions
self.keys = str(keybuffer)
self.matches = keybuffer.matches
self.match = keybuffer.matches and keybuffer.matches[0] or None
self.binding = keybuffer.command
@staticmethod
def from_widget(widget):
return CommandArgs(widget.fm, \
widget, widget.env.keybuffer)
class KeyMap(Tree):
"""Contains a tree with all the keybindings"""
def map(self, *args, **keywords):
if keywords:
return self.add_binding(*args, **keywords)
firstarg = args[-1]
if isfunction(firstarg):
keywords[FUNC] = firstarg
return self.add_binding(*args[:-1], **keywords)
def decorator_function(func):
keywords = {FUNC:func}
self.map(*args, **keywords)
return func
return decorator_function
__call__ = map
def add_binding(self, *keys, **actions):
assert keys
bind = Binding(keys, actions)
for key in keys:
self.set(translate_keys(key), bind)
def __getitem__(self, key):
return self.traverse(translate_keys(key))
class Binding(object):
"""The keybinding object"""
def __init__(self, keys, actions):
assert hasattr(keys, '__iter__')
assert isinstance(actions, dict)
self.actions = actions
try:
self.function = self.actions[FUNC]
except KeyError:
self.function = None
self.has_direction = False
else:
argnames = getargspec(self.function)[0]
try:
self.has_direction = actions['with_direction']
except KeyError:
self.has_direction = DIRECTION in argnames
try:
self.direction = self.actions[DIRARG]
except KeyError:
self.direction = None
try:
alias = self.actions[ALIASARG]
except KeyError:
self.alias = None
else:
self.alias = tuple(translate_keys(alias))
class KeyBuffer(object):
"""The evaluator and storage for pressed keys"""
def __init__(self, keymap, direction_keys):
self.assign(keymap, direction_keys)
def assign(self, keymap, direction_keys):
self.keymap = keymap
self.direction_keys = direction_keys
def add(self, key):
if self.failure:
return None
assert isinstance(key, int)
assert key >= 0
# evaluate quantifiers
if self.eval_quantifier and self._do_eval_quantifier(key):
return
# evaluate the command
if self.eval_command and self._do_eval_command(key):
return
# evaluate (the first number of) the direction-quantifier
if self.eval_quantifier and self._do_eval_quantifier(key):
return
# evaluate direction keys {j,k,gg,pagedown,...}
if not self.eval_command:
self._do_eval_direction(key)
def _do_eval_direction(self, key):
# swap quant and direction_quant in bindings like '<dir>'
if self.quant is not None and self.command is None \
and self.direction_quant is None:
self.direction_quant = self.quant
self.quant = None
try:
assert isinstance(self.dir_tree_pointer, dict)
self.dir_tree_pointer = self.dir_tree_pointer[key]
except KeyError:
self.failure = True
else:
self._direction_try_to_finish()
def _direction_try_to_finish(self, rec=MAX_ALIAS_RECURSION):
if rec <= 0:
self.failure = True
return None
match = self.dir_tree_pointer
assert isinstance(match, (Binding, dict, KeyMap))
if isinstance(match, KeyMap):
self.dir_tree_pointer = self.dir_tree_pointer._tree
match = self.dir_tree_pointer
if isinstance(self.dir_tree_pointer, Binding):
if match.alias:
try:
self.dir_tree_pointer = self.direction_keys[match.alias]
self._direction_try_to_finish(rec - 1)
except KeyError:
self.failure = True
return None
else:
direction = match.actions['dir'] * self.direction_quant
self.directions.append(direction)
self.direction_quant = None
self.eval_command = True
self._try_to_finish()
def _do_eval_quantifier(self, key):
if self.eval_command:
tree = self.tree_pointer
else:
tree = self.dir_tree_pointer
if is_ascii_digit(key) and ANYKEY not in tree:
attr = self.eval_command and 'quant' or 'direction_quant'
if getattr(self, attr) is None:
setattr(self, attr, 0)
setattr(self, attr, getattr(self, attr) * 10 + key - 48)
else:
self.eval_quantifier = False
return None
return True
def _do_eval_command(self, key):
assert isinstance(self.tree_pointer, dict), self.tree_pointer
try:
self.tree_pointer = self.tree_pointer[key]
except TypeError:
print(self.tree_pointer)
self.failure = True
return None
except KeyError:
if DIRKEY in self.tree_pointer:
self.eval_command = False
self.eval_quantifier = True
self.tree_pointer = self.tree_pointer[DIRKEY]
assert isinstance(self.tree_pointer, (Binding, dict))
self.dir_tree_pointer = self.direction_keys._tree
elif ANYKEY in self.tree_pointer:
self.matches.append(key)
self.tree_pointer = self.tree_pointer[ANYKEY]
assert isinstance(self.tree_pointer, (Binding, dict))
self._try_to_finish()
else:
self.failure = True
return None
else:
if isinstance(self.tree_pointer, dict):
try:
self.command = self.tree_pointer[PASSIVE_ACTION]
except (KeyError, TypeError):
self.command = None
self._try_to_finish()
def _try_to_finish(self, rec=MAX_ALIAS_RECURSION):
if rec <= 0:
self.failure = True
return None
assert isinstance(self.tree_pointer, (Binding, dict, KeyMap))
if isinstance(self.tree_pointer, KeyMap):
self.tree_pointer = self.tree_pointer._tree
if isinstance(self.tree_pointer, Binding):
if self.tree_pointer.alias:
try:
self.tree_pointer = self.keymap[self.tree_pointer.alias]
self._try_to_finish(rec - 1)
except KeyError:
self.failure = True
return None
else:
self.command = self.tree_pointer
self.done = True
def clear(self):
self.failure = False
self.done = False
self.quant = None
self.matches = []
self.command = None
self.direction_quant = None
self.directions = []
self.all_keys = []
self.tree_pointer = self.keymap._tree
self.dir_tree_pointer = self.direction_keys._tree
self.eval_quantifier = True
self.eval_command = True
def __str__(self):
"""returns a concatenation of all characters"""
return "".join(to_string(c) for c in self.all_keys)
def simulate_press(self, string):
for char in translate_keys(string):
self.add(char)
if self.done:
return self.command
if self.failure:
break
return self.command
special_keys = {
'dir': DIRKEY,
'any': ANYKEY,
'bg': PASSIVE_ACTION,
'cr': ord("\n"),
'enter': ord("\n"),
'space': ord(" "),
'space': ord(" "),
'down': curses.KEY_DOWN,
'up': curses.KEY_UP,
'left': curses.KEY_LEFT,
'right': curses.KEY_RIGHT,
'mouse': curses.KEY_MOUSE,
'resize': curses.KEY_RESIZE,
'pagedown': curses.KEY_NPAGE,
'pageup': curses.KEY_PPAGE,
'home': curses.KEY_HOME,
'end': curses.KEY_END,
'tab': ord('\t'),
}
for char in ascii_lowercase:
special_keys['c-' + char] = ord(char) - 96
def translate_keys(obj):
"""
Translate a keybinding to a sequence of integers
Example:
lol<CR> => (108, 111, 108, 10)
"""
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:
yield special_keys[string]
except KeyError:
yield ord('<')
for c in bracket_content:
yield ord(c)
yield ord('>')
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)
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