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# Copyright 2022 The HuggingFace Team and Brian Chao. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
This file contains utilities for handling input from the user and registering specific keys to specific functions,
based on https://github.com/bchao1/bullet
"""
from typing import List
from .keymap import KEYMAP, get_character
def mark(key: str):
"""
Mark the function with the key code so it can be handled in the register
"""
def decorator(func):
handle = getattr(func, "handle_key", [])
handle += [key]
func.handle_key = handle
return func
return decorator
def mark_multiple(*keys: List[str]):
"""
Mark the function with the key codes so it can be handled in the register
"""
def decorator(func):
handle = getattr(func, "handle_key", [])
handle += keys
func.handle_key = handle
return func
return decorator
class KeyHandler(type):
"""
Metaclass that adds the key handlers to the class
"""
def __new__(cls, name, bases, attrs):
new_cls = super().__new__(cls, name, bases, attrs)
if not hasattr(new_cls, "key_handler"):
new_cls.key_handler = {}
new_cls.handle_input = KeyHandler.handle_input
for value in attrs.values():
handled_keys = getattr(value, "handle_key", [])
for key in handled_keys:
new_cls.key_handler[key] = value
return new_cls
@staticmethod
def handle_input(cls):
"Finds and returns the selected character if it exists in the handler"
char = get_character()
if char != KEYMAP["undefined"]:
char = ord(char)
handler = cls.key_handler.get(char)
if handler:
cls.current_selection = char
return handler(cls)
else:
return None
def register(cls):
"""Adds KeyHandler metaclass to the class"""
return KeyHandler(cls.__name__, cls.__bases__, cls.__dict__.copy())
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