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()