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if __name__ == '__main__': from __init__ import init; init()
from unittest import TestCase, main
from inspect import isfunction, getargspec
import inspect
from sys import intern
FUNC = 'func'
DIRECTION = 'direction'
QUANTIFIER = 'n'
MATCH = intern('!!')
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 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
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.quant1
self.direction = keybuffer.direction
self.keys = str(keybuffer)
class KeyBuffer(object):
"""The evaluator and storage for pressed keys"""
def __init__(self, keymap, direction_keys):
self.keymap = keymap
self.direction_keys = direction_keys
self.clear()
def add(self, key):
if self.failure:
return None
assert isinstance(key, int)
assert key >= 0
# evaluate first quantifier
if self.level == 0:
if is_ascii_digit(key):
if self.quant1 is None:
self.quant1 = 0
self.quant1 = self.quant1 * 10 + key - 48
else:
self.level = 1
# evaluate the command and the second quantifier.
# it's possible to jump between them. "x3xj" is equivalent to "xx3j"
if self.level == 1:
try:
self.tree_pointer = self.tree_pointer[key]
except KeyError:
try:
match = self.tree_pointer[MATCH]
except KeyError:
self.failure = True
return None
# self.command = match
if is_ascii_digit(key):
if self.quant2 is None:
self.quant2 = 0
self.quant2 = self.quant2 * 10 + key - 48
else:
self.level = 2
self.tree_pointer = self.direction_keys._tree
else:
try:
match = self.tree_pointer[MATCH]
except KeyError:
pass
else:
self.command = match
if not match.has_direction:
if self.quant2 is not None:
self.direction = self.direction * self.quant2
self.done = True
# evaluate direction keys {j,k,gg,pagedown,...}
if self.level == 2:
try:
self.tree_pointer = self.tree_pointer[key]
except KeyError:
self.failure = True
else:
try:
match = self.tree_pointer[MATCH]
except KeyError:
pass
else:
self.direction = match.actions['dir'] * self.quant2
self.done = True
def clear(self):
self.failure = False
self.done = False
self.quant1 = None
self.quant2 = None
self.command = None
self.direction = Direction(down=1)
self.all_keys = []
self.tree_pointer = self.keymap._tree
self.direction_tree_pointer = self.direction_keys._tree
self.level = 0
# level 0 = parsing quantifier 1
# 1 = parsing command or quantifier 2
# 2 = parsing direction
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 string:
self.add(ord(char))
if self.done:
return self.command
if self.failure:
break
class Keymap(object):
"""Contains a tree with all the keybindings"""
def __init__(self):
self._tree = dict()
def add(self, *args, **keywords):
if keywords:
return self.add_binding(*args, **keywords)
firstarg = args[0]
if isfunction(firstarg):
keywords[FUNC] = firstarg
return self.add_binding(*args[1:], **keywords)
def decorator_function(func):
keywords = {FUNC:func}
self.add(*args, **keywords)
return func
return decorator_function
def _split(self, key):
assert isinstance(key, (tuple, int, str))
if isinstance(key, tuple):
return key
if isinstance(key, str):
return (ord(k) for k in key)
if isinstance(key, int):
return (key, )
raise TypeError(key)
def add_binding(self, *keys, **actions):
assert keys
bind = binding(keys, actions)
for key in keys:
assert key
chars = tuple(self._split(key))
tree = self.traverse_tree(chars)
tree[MATCH] = bind
def traverse_tree(self, generator):
tree = self._tree
for char in generator:
try:
tree = tree[char]
except KeyError:
tree[char] = dict()
tree = tree[char]
except TypeError:
raise TypeError("Attempting to override existing entry")
return tree
def __getitem__(self, key):
tree = self._tree
for char in self._split(key):
try:
tree = tree[char]
except TypeError:
raise KeyError("trying to enter leaf")
except KeyError:
raise KeyError(str(char) + " not in tree " + str(tree))
try:
return tree[MATCH]
except KeyError:
raise KeyError(str(char) + " not in tree " + str(tree))
class binding(object):
"""The keybinding object"""
def __init__(self, keys, actions):
assert hasattr(keys, '__iter__')
assert isinstance(actions, dict)
self.keys = set(keys)
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
def add_keys(self, keys):
assert isinstance(keys, set)
self.keys |= keys
def has(self, action):
return action in self.actions
def action(self, key):
return self.actions[key]
def n(value):
""" return n or value """
def fnc(n=None):
if n is None:
return value
return n
return fnc
def nd(n=1, direction=Direction()):
""" n * direction """
if n is None:
n = 1
return n * direction.down
class Test(TestCase):
"""The test cases"""
def test_add(self):
c = Keymap()
c.add(lambda *_: 'lolz', 'aa', 'b')
self.assert_(c['aa'].actions[FUNC](), 'lolz')
@c.add('a', 'c')
def test():
return 5
self.assert_(c['b'].actions[FUNC](), 'lolz')
self.assert_(c['c'].actions[FUNC](), 5)
self.assert_(c['a'].actions[FUNC](), 5)
def test_quantifier(self):
km = Keymap()
directions = Keymap()
kb = KeyBuffer(km, directions)
km.add(n(5), 'd')
match = kb.simulate_press('3d')
self.assertEqual(3, match.function(kb.quant1))
kb.clear()
match = kb.simulate_press('6223d')
self.assertEqual(6223, match.function(kb.quant1))
kb.clear()
def test_direction(self):
km = Keymap()
directions = Keymap()
kb = KeyBuffer(km, directions)
directions.add('j', dir=Direction(down=1))
directions.add('k', dir=Direction(down=-1))
km.add(nd, 'd')
km.add('dd', func=nd, with_direction=False)
match = kb.simulate_press('3d5j')
self.assertEqual(15, match.function(n=kb.quant1, direction=kb.direction))
kb.clear()
match = kb.simulate_press('3d5k')
self.assertEqual(-15, match.function(n=kb.quant1, direction=kb.direction))
kb.clear()
match = kb.simulate_press('3d5d')
self.assertEqual(15, match.function(n=kb.quant1, direction=kb.direction))
kb.clear()
match = kb.simulate_press('3dd')
self.assertEqual(3, match.function(n=kb.quant1, direction=kb.direction))
kb.clear()
match = kb.simulate_press('dd')
self.assertEqual(1, match.function(n=kb.quant1, direction=kb.direction))
kb.clear()
km.add(nd, 'x')
km.add('xxxx', func=nd, with_direction=False)
match = kb.simulate_press('xxxxj')
self.assertEqual(1, match.function(n=kb.quant1, direction=kb.direction))
kb.clear()
match = kb.simulate_press('xxxxjsomeinvalidchars')
self.assertEqual(1, match.function(n=kb.quant1, direction=kb.direction))
kb.clear()
self.assertEqual(None, kb.simulate_press('xxxj'))
kb.clear()
self.assertEqual(None, kb.simulate_press('xxj'))
kb.clear()
self.assertEqual(None, kb.simulate_press('xxkldfjalksdjklsfsldkj'))
kb.clear()
self.assertEqual(None, kb.simulate_press('xyj'))
kb.clear()
self.assertEqual(None, kb.simulate_press('x')) #direction missing
kb.clear()
if __name__ == '__main__': main()
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