Initial import

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diff --git a/lulua/test_writer.py b/lulua/test_writer.py
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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.
+
+from io import StringIO
+
+import pytest
+
+from .writer import Writer, SkipEvent
+from .layout import *
+from .keyboard import defaultKeyboards
+
+def toButtonComb (keyboard, data):
+    lookupButton = lambda x: keyboard.find (x)
+    return ButtonCombination (*map (lambda y: frozenset (lookupButton (z) for z in y), data))
+    
+def test_writer ():
+    keyboard = defaultKeyboards['ibmpc105']
+    layout = defaultLayouts['ar-linux'].specialize (keyboard)
+    w = Writer (layout)
+
+    f = w[LEFT][RING]
+    assert f.number == RING
+    assert f.hand.position == LEFT
+
+typeData = [
+    ('شسضص', [
+        ('ش', (tuple (), ('Dl1', ))),
+        ('س', (tuple (), ('Dl2', ))),
+        ('ض', (tuple (), ('Cl1', ))),
+        ('ص', (tuple (), ('Cl2', ))),
+        ]),
+    ('aصb', [
+        (None, SkipEvent ('a')),
+        ('ص', (tuple (), ('Cl2', ))),
+        (None, SkipEvent ('b')),
+        ]),
+    ]
+
+@pytest.mark.parametrize("s, expect", typeData)
+def test_writer_type (s, expect):
+    keyboard = defaultKeyboards['ibmpc105']
+    layout = defaultLayouts['ar-linux'].specialize (keyboard)
+    w = Writer (layout)
+
+    data = StringIO (s)
+    result = list (w.type (data))
+
+    newExpect = []
+    for char, comb in expect:
+        if isinstance (comb, SkipEvent):
+            newExpect.append ((char, comb))
+        else:
+            newExpect.append ((char, toButtonComb (keyboard, comb)))
+    expect = newExpect
+    assert result == expect
+
+testCombs = [
+    ([
+        (('El_shift', ), ('Dr7', )),
+        (('Er_shift', ), ('Dr7', )),
+    ], 0, None
+    ), ([
+        (('El_shift', ), ('Dl5', )),
+        (('Er_shift', ), ('Dl5', )),
+    ], 1, None
+    ), ([
+        (tuple (), ('Fl_space', )),
+        (tuple (), ('Fr_space', )),
+    ], 0, (tuple (), ('Dr7', ))
+    ), ([
+        (tuple (), ('Fl_space', )),
+        (tuple (), ('Fr_space', )),
+    ], 1, (tuple (), ('Dl5', ))
+    ), ([
+        (tuple (), ('Fl_space', )),
+        (tuple (), ('Fr_space', )),
+    ], 0, (('El_shift', ), ('Dr7', ))
+    ), ([
+        (tuple (), ('Fl_space', )),
+        (tuple (), ('Fr_space', )),
+    ], 0, (('Er_shift', ), ('Dl5', ))
+    ), ([
+        # choose the shortest combination if there’s two available
+        (tuple (), ('CD_ret', )),
+        (('Er_shift', ), ('CD_ret', )),
+        (('El_shift', ), ('CD_ret', )),
+    ], 0, None),
+    ]
+
+@pytest.mark.parametrize("combs, expect, prev", testCombs)
+def test_writer_chooseComb (combs, expect, prev):
+    keyboard = defaultKeyboards['ibmpc105']
+    layout = defaultLayouts['ar-linux'].specialize (keyboard)
+    w = Writer (layout)
+
+    if prev:
+        prev = toButtonComb (keyboard, prev)
+        w.press (prev)
+    combs = [toButtonComb (keyboard, x) for x in combs]
+    assert w.chooseCombination (combs) == combs[expect]
+