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@ -30,6 +30,22 @@ from keymapper.logger import logger
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from keymapper.paths import get_config_path
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def update_reverse_mapping(func):
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"""Generate a reverse mapping to optimize reverse lookups.
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If _mapping contains `20: "a, A"`,
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reverse mapping will contain `"a": 20, "A": 20`
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"""
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def wrapper(self, *args, **kwargs):
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func(self, *args, **kwargs)
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self._reverse_mapping = {}
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for key, value in self._mapping.items():
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for character in value.split(','):
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self._reverse_mapping[character.strip()] = key
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return wrapper
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class Mapping:
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"""Contains and manages mappings.
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@ -38,6 +54,14 @@ class Mapping:
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"""
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def __init__(self):
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self._mapping = {}
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# Maintain this second mapping in order to optimize get_keycode.
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# This mapping is not complete, since multiple keycodes can map
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# to the same character in _mapping which is not possible in
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# _reverse_mapping! It is based on _reverse_mapping and
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# reconstructed on changes.
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self._reverse_mapping = {}
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self.changed = False
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def __iter__(self):
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@ -47,6 +71,7 @@ class Mapping:
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def __len__(self):
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return len(self._mapping)
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@update_reverse_mapping
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def change(self, new_keycode, character, previous_keycode=None):
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"""Replace the mapping of a keycode with a different one.
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@ -85,6 +110,7 @@ class Mapping:
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return False
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@update_reverse_mapping
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def clear(self, keycode):
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"""Remove a keycode from the mapping.
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@ -96,11 +122,13 @@ class Mapping:
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del self._mapping[keycode]
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self.changed = True
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@update_reverse_mapping
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def empty(self):
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"""Remove all mappings."""
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self._mapping = {}
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self.changed = True
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@update_reverse_mapping
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def load(self, device, preset):
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"""Load a dumped JSON from home to overwrite the mappings."""
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path = get_config_path(device, preset)
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@ -141,17 +169,12 @@ class Mapping:
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self.changed = False
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def get_keycode(self, character):
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"""Get the keycode for that character."""
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# TODO prepare separate data structure for optimization
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for keycode, mapping in self._mapping.items():
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# note, that stored mappings are already lowercase
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if ', ' in mapping:
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if character in [c.strip() for c in mapping.split(',')]:
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return keycode
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elif mapping == character:
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return int(keycode)
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return None
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"""Get the keycode for that character.
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If multiple keycodes map to that character, an arbitrary one of
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those is returned.
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"""
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return self._reverse_mapping.get(character)
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def get_character(self, keycode):
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"""Read the character that is mapped to this keycode.
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