Source code for joy.vui.stack_viewer

# -*- coding: utf-8 -*-
#
#    Copyright © 2019 Simon Forman
#
#    This file is part of Thun
#
#    Thun is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    Thun is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
#
'''

Stack Viewer
=================

'''
from joy.utils.stack import expression_to_string, iter_stack
from joy.vui import core, text_viewer


MAX_WIDTH = 64


[docs]def fsi(item): '''Format Stack Item''' if isinstance(item, tuple): res = '[%s]' % expression_to_string(item) elif isinstance(item, str): res = '"%s"' % item else: assert not isinstance(item, unicode), repr(item) res = str(item) if len(res) > MAX_WIDTH: return res[:MAX_WIDTH - 3] + '...' return res
[docs]class StackViewer(text_viewer.TextViewer): def __init__(self, surface): super(StackViewer, self).__init__(surface) self.stack_holder = None self.content_id = 'stack viewer' def _attach(self, display): if self.stack_holder: return om = core.OpenMessage(self, 'stack.pickle') display.broadcast(om) if om.status != core.SUCCESS: raise RuntimeError('stack unavailable') self.stack_holder = om.thing def _update(self): self.lines[:] = map(fsi, iter_stack(self.stack_holder[0])) or [''] def focus(self, display): self._attach(display) super(StackViewer, self).focus(display) def handle(self, message): if (isinstance(message, core.ModifyMessage) and message.subject is self.stack_holder ): self._update() self.draw_body()