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110 lines
3.8 KiB
Python
110 lines
3.8 KiB
Python
# Copyright 2000-2008 Michael Hudson-Doyle <micahel@gmail.com>
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# Armin Rigo
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#
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# All Rights Reserved
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#
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#
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# Permission to use, copy, modify, and distribute this software and
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# its documentation for any purpose is hereby granted without fee,
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# provided that the above copyright notice appear in all copies and
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# that both that copyright notice and this permission notice appear in
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# supporting documentation.
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#
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# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO
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# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
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# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""
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OS-independent base for an event and VT sequence scanner
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See unix_eventqueue and windows_eventqueue for subclasses.
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"""
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from collections import deque
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from . import keymap
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from .console import Event
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from .trace import trace
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class BaseEventQueue:
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def __init__(self, encoding: str, keymap_dict: dict[bytes, str]) -> None:
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self.compiled_keymap = keymap.compile_keymap(keymap_dict)
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self.keymap = self.compiled_keymap
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trace("keymap {k!r}", k=self.keymap)
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self.encoding = encoding
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self.events: deque[Event] = deque()
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self.buf = bytearray()
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def get(self) -> Event | None:
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"""
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Retrieves the next event from the queue.
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"""
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if self.events:
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return self.events.popleft()
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else:
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return None
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def empty(self) -> bool:
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"""
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Checks if the queue is empty.
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"""
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return not self.events
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def flush_buf(self) -> bytearray:
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"""
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Flushes the buffer and returns its contents.
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"""
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old = self.buf
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self.buf = bytearray()
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return old
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def insert(self, event: Event) -> None:
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"""
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Inserts an event into the queue.
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"""
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trace('added event {event}', event=event)
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self.events.append(event)
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def push(self, char: int | bytes) -> None:
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"""
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Processes a character by updating the buffer and handling special key mappings.
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"""
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assert isinstance(char, (int, bytes))
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ord_char = char if isinstance(char, int) else ord(char)
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char = ord_char.to_bytes()
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self.buf.append(ord_char)
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if char in self.keymap:
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if self.keymap is self.compiled_keymap:
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# sanity check, buffer is empty when a special key comes
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assert len(self.buf) == 1
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k = self.keymap[char]
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trace('found map {k!r}', k=k)
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if isinstance(k, dict):
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self.keymap = k
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else:
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self.insert(Event('key', k, bytes(self.flush_buf())))
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self.keymap = self.compiled_keymap
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elif self.buf and self.buf[0] == 27: # escape
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# escape sequence not recognized by our keymap: propagate it
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# outside so that i can be recognized as an M-... key (see also
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# the docstring in keymap.py
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trace('unrecognized escape sequence, propagating...')
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self.keymap = self.compiled_keymap
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self.insert(Event('key', '\033', b'\033'))
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for _c in self.flush_buf()[1:]:
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self.push(_c)
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else:
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try:
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decoded = bytes(self.buf).decode(self.encoding)
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except UnicodeError:
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return
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else:
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self.insert(Event('key', decoded, bytes(self.flush_buf())))
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self.keymap = self.compiled_keymap
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