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# Copyright (c) 2019 lulua contributors
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import json
from operator import itemgetter
from .layout import *
# XXX: dynamically index this by Button()?
defaultFingermap = {
# fingers: hand (L/R), finger (counting from left to right on left hand and right to left on right hand)
# B: number row
# number keys left side
'Bl1': (LEFT, LITTLE),
'Bl2': (LEFT, LITTLE),
'Bl3': (LEFT, LITTLE),
'Bl4': (LEFT, RING),
'Bl5': (LEFT, MIDDLE),
'Bl6': (LEFT, INDEX),
'Bl7': (LEFT, INDEX),
# number keys right side
'Br6': (RIGHT, INDEX),
'Br5': (RIGHT, INDEX),
'Br4': (RIGHT, MIDDLE),
'Br3': (RIGHT, RING),
'Br2': (RIGHT, LITTLE),
'Br1': (RIGHT, LITTLE),
'Br_bs': (RIGHT, LITTLE),
# C: top row
'Cl_tab': (LEFT, LITTLE),
# letter keys left side
'Cl1': (LEFT, LITTLE),
'Cl2': (LEFT, RING),
'Cl3': (LEFT, MIDDLE),
'Cl4': (LEFT, INDEX),
'Cl5': (LEFT, INDEX),
# letter keys right side
'Cr7': (RIGHT, INDEX),
'Cr6': (RIGHT, INDEX),
'Cr5': (RIGHT, MIDDLE),
'Cr4': (RIGHT, RING),
'Cr3': (RIGHT, LITTLE),
'Cr2': (RIGHT, LITTLE),
'Cr1': (RIGHT, LITTLE),
# return key
'CD_ret': (RIGHT, LITTLE),
# D: middle row
'Dl_caps': (LEFT, LITTLE),
# letter keys left side
'Dl1': (LEFT, LITTLE),
'Dl2': (LEFT, RING),
'Dl3': (LEFT, MIDDLE),
'Dl4': (LEFT, INDEX),
'Dl5': (LEFT, INDEX),
# letter keys right side
'Dr7': (RIGHT, INDEX),
'Dr6': (RIGHT, INDEX),
'Dr5': (RIGHT, MIDDLE),
'Dr4': (RIGHT, RING),
'Dr3': (RIGHT, LITTLE),
'Dr2': (RIGHT, LITTLE),
'Dr1': (RIGHT, LITTLE),
# E: bottom row
'El_shift': (LEFT, LITTLE),
# letter keys left side
'El1': (LEFT, LITTLE),
'El2': (LEFT, LITTLE),
'El3': (LEFT, RING),
'El4': (LEFT, MIDDLE),
'El5': (LEFT, INDEX),
'El6': (LEFT, INDEX),
# letter keys right side
'Er5': (RIGHT, INDEX),
'Er4': (RIGHT, INDEX),
'Er3': (RIGHT, MIDDLE),
'Er2': (RIGHT, RING),
'Er1': (RIGHT, LITTLE),
'Er_shift': (RIGHT, LITTLE),
# F: bottom control row
'Fl_ctrl': (LEFT, LITTLE),
'Fl_fn': (LEFT, LITTLE),
'Fl_win': (LEFT, THUMB),
'Fl_alt': (LEFT, THUMB),
'Fl_space': (LEFT, THUMB),
'Fr_space': (RIGHT, THUMB),
'Fr_altgr': (RIGHT, THUMB),
'Fr_win': (RIGHT, THUMB),
'Fr_menu': (RIGHT, THUMB),
'Fr_ctrl': (RIGHT, LITTLE),
}
class SkipEvent:
__slots__ = ('char', )
def __init__ (self, char):
self.char = char
def __eq__ (self, other):
if not isinstance (other, SkipEvent):
return NotImplemented
return self.char == other.char
def __repr__ (self):
return f'SkipEvent({self.char!r})'
class Writer:
""" The magical being whose commands the machine obeys """
__slots__ = ('hands', 'lastCombination', 'layout')
def __init__ (self, layout: KeyboardLayout):
self.layout = layout
# assuming 10 finger typing
self.hands = {
LEFT: Hand (LEFT, [Finger (x) for x in FingerType]),
RIGHT: Hand (RIGHT, [Finger (x) for x in reversed (FingerType)]),
}
self.lastCombination = None
def __getitem__ (self, k):
return self.hands[k]
def getHandFinger (self, button: Button):
return defaultFingermap[button.name]
def chooseCombination (self, combinations):
"""
Choose the best button combination from the ones given.
Return the actual button combination used.
For instance:
- A key on the right is usually combined with the shift button on the
left and vice versa.
- The spacebar is usually hit by the thumb of the previously unused
hand or the one on the left if two buttons were pressed at the same
time.
- The combination with the minimum amount of fingers required is chosen
if multiple options are available
"""
dirToScore = {LEFT: 1, RIGHT: -1}
def calcEffort (comb):
prev = self.lastCombination
if prev is None:
e = 0
elif len (prev) > 1:
# prefer left side
e = dirToScore[RIGHT]
else:
assert len (prev.buttons) == 1
e = dirToScore[self.getHandFinger (first (prev.buttons))[0]]
for b in comb:
pos = self.getHandFinger (b)[0]
e += dirToScore[pos]
#print ('score for', buttons, abs (e))
return abs (e) + len (comb)
return min (zip (map (calcEffort, combinations), combinations), key=itemgetter (0))[1]
def press (self, comb):
self.lastCombination = comb
def type (self, fd):
buf = ''
while True:
buf += fd.read (self.layout.bufferLen-len (buf))
if not buf:
break
try:
match, combinations = self.layout (buf)
assert len (match) > 0, (match, combinations, buf)
comb = self.chooseCombination (combinations)
yield match, comb
self.press (comb)
buf = buf[len (match):]
except KeyError:
# ignore unknown characters
yield None, SkipEvent (buf[0])
buf = buf[1:]
continue
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