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Copy pathinterface.py
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131 lines (115 loc) · 4.72 KB
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"""
PC-BASIC - interface.interface
Interface class
(c) 2013--2023 Rob Hagemans
This file is released under the GNU GPL version 3 or later.
"""
import sys
import threading
import logging
import traceback
from ..compat import queue
from ..basic.base import signals
from .base import InitFailed, video_plugins, audio_plugins, WAIT_MESSAGE
from .audio import AudioPlugin
# millisecond delay
DELAY = 12
class Interface(object):
"""User interface for PC-BASIC session."""
def __init__(self, try_interfaces=(), audio_override=None, wait=False, **kwargs):
"""Initialise interface."""
self._input_queue = queue.Queue()
self._video_queue = queue.Queue()
self._audio_queue = queue.Queue()
self._wait = wait
self._video, self._audio = None, None
for video in try_interfaces:
try:
self._video = video_plugins[video](self._input_queue, self._video_queue, **kwargs)
except KeyError:
logging.error('Unknown video plugin `%s`', video)
except InitFailed as e:
logging.info('Could not initialise video plugin `%s`: %s', video, e)
if self._video:
break
else:
# video plugin is necessary, fail without it
raise InitFailed('Failed to initialise any video plugin.')
audio = audio_override or video
try:
self._audio = audio_plugins[audio](self._audio_queue, **kwargs)
except KeyError:
# ignore if an interface has no audio, but not if an override doesn't exist
if audio_override and audio_override not in ('none', 'false'):
logging.error('Unknown audio plugin `%s`', audio)
except InitFailed as e:
logging.info('Could not initialise audio plugin `%s`: %s', audio, e)
if not self._audio:
# audio fallback to no-plugin
self._audio = AudioPlugin(self._audio_queue, **kwargs)
def get_queues(self):
"""Retrieve interface queues."""
return self._input_queue, self._video_queue, self._audio_queue
def launch(self, target, *args, **kwargs):
"""Start an interactive interpreter session."""
thread = threading.Thread(target=self._thread_runner, args=(target,) + args, kwargs=kwargs)
try:
# launch the BASIC thread
thread.start()
# run the interface
self.run()
except Exception as e:
logging.error('Fatal error in interface')
logging.error(''.join(traceback.format_exception(*sys.exc_info())))
finally:
self.quit_input()
thread.join()
def _thread_runner(self, target, *args, **kwargs):
"""Session runner."""
try:
target(*args, **kwargs)
finally:
if self._wait:
self.pause(WAIT_MESSAGE)
self.quit_output()
def run(self):
"""Start the main interface event loop."""
with self._audio:
with self._video:
while self._audio.alive or self._video.alive:
# ensure both queues are drained
self._video.cycle()
self._audio.cycle()
if not self._audio.busy and not self._video.busy:
# nothing to do, come back later
self._video.sleep(DELAY)
def pause(self, message):
"""Pause and wait for a key."""
self._video_queue.put(signals.Event(signals.VIDEO_SET_CAPTION, (message,)))
self._video_queue.put(signals.Event(signals.VIDEO_SHOW_CURSOR, (False, False)))
while True:
signal = self._input_queue.get()
if signal.event_type in (signals.KEYB_DOWN, signals.QUIT):
self._video_queue.put(signals.Event(signals.VIDEO_SET_CAPTION, (u'',)))
return signal
def quit_input(self):
"""Send signal through the input queue to quit BASIC."""
self._input_queue.put(signals.Event(signals.QUIT))
# drain video queue (joined in other thread)
while not self._video_queue.empty():
try:
signal = self._video_queue.get(False)
except queue.Empty:
continue
self._video_queue.task_done()
# drain audio queue
while not self._audio_queue.empty():
try:
signal = self._audio_queue.get(False)
except queue.Empty:
continue
self._audio_queue.task_done()
def quit_output(self):
"""Send signal through the output queues to quit plugins."""
self._video_queue.put(signals.Event(signals.QUIT))
self._audio_queue.put(signals.Event(signals.QUIT))