def chain(action, g, jumpnum, delete_lines):
""" Chain load the program from g and hand over execution. """
if delete_lines:
# delete lines from existing code before merge (without MERGE, this is pointless)
delete(*delete_lines)
action(g)
# don't close files!
# RUN
flow.jump(jumpnum, err=error.IFC)
def chain(action, g, jumpnum, delete_lines):
""" Chain load the program from g and hand over execution. """
if delete_lines:
# delete lines from existing code before merge (without MERGE, this is pointless)
delete(*delete_lines)
action(g)
# don't close files!
# RUN
flow.jump(jumpnum, err=error.IFC)
def trap_error(self, e):
""" Handle a BASIC error through trapping. """
if e.pos is None:
if state.basic_state.run_mode:
e.pos = state.basic_state.bytecode.tell()-1
else:
e.pos = -1
state.basic_state.errn = e.err
state.basic_state.errp = e.pos
# don't jump if we're already busy handling an error
if state.basic_state.on_error is not None and state.basic_state.on_error != 0 and not state.basic_state.error_handle_mode:
state.basic_state.error_resume = state.basic_state.current_statement, state.basic_state.run_mode
flow.jump(state.basic_state.on_error)
state.basic_state.error_handle_mode = True
state.basic_state.events.suspend_all = True
else:
raise e
def start(cmd='', run=False, quit=False):
""" Start the interpreter. """
if cmd:
store_line(cmd)
if run:
# run command before program
if cmd:
run_once()
# position the pointer at start of program and enter execute mode
flow.jump(None)
state.basic_state.execute_mode = True
state.console_state.screen.cursor.reset_visibility()
# read-eval-print loop until quit or exception
while True:
run_once()
if quit and state.console_state.keyb.buf.is_empty():
break
def start(cmd='', run=False, quit=False):
""" Start the interpreter. """
if cmd:
store_line(cmd)
if run:
# run command before program
if cmd:
run_once()
# position the pointer at start of program and enter execute mode
flow.jump(None)
state.basic_state.execute_mode = True
state.console_state.screen.cursor.reset_visibility()
# read-eval-print loop until quit or exception
while True:
run_once()
if quit and state.console_state.keyb.buf.is_empty():
break
def trap_error(e):
""" Handle a BASIC error through trapping. """
if e.pos is None:
if state.basic_state.run_mode:
e.pos = state.basic_state.bytecode.tell()-1
else:
e.pos = -1
state.basic_state.errn = e.err
state.basic_state.errp = e.pos
# don't jump if we're already busy handling an error
if state.basic_state.on_error is not None and state.basic_state.on_error != 0 and not state.basic_state.error_handle_mode:
state.basic_state.error_resume = state.basic_state.current_statement, state.basic_state.run_mode
flow.jump(state.basic_state.on_error)
state.basic_state.error_handle_mode = True
state.basic_state.events.suspend_all = True
else:
raise e
def run(self, command, run, quit, wait):
""" Interactive interpreter session. """
if command:
self.store_line(command)
self.loop()
if run:
# position the pointer at start of program and enter execute mode
flow.jump(None)
state.basic_state.parse_mode = True
state.console_state.screen.cursor.reset_visibility()
try:
try:
while True:
self.loop()
if quit and state.console_state.keyb.buf.is_empty():
break
except error.Exit:
# pause before exit if requested
if wait:
signals.video_queue.put(signals.Event(signals.VIDEO_SET_CAPTION, 'Press a key to close window'))
signals.video_queue.put(signals.Event(signals.VIDEO_SHOW_CURSOR, False))
state.console_state.keyb.pause = True
# this performs a blocking keystroke read if in pause state
events.check_events()
finally:
# close interfaces
signals.video_queue.put(signals.Event(signals.VIDEO_QUIT))
signals.message_queue.put(signals.Event(signals.AUDIO_QUIT))
# persist unplayed tones in sound queue
state.console_state.tone_queue_store = [
signals.save_queue(q) for q in signals.tone_queue]
state.save()
# close files if we opened any
devices.close_files()
devices.close_devices()
except error.Reset:
# delete state if resetting
state.delete()
