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# Copyright (C) 2013, Martin Abente Lahaye - tch@sugarlabs.org
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
import os
from gi.repository import GObject
def get_valid_file_name(file_name):
# Invalid characters in VFAT filenames. From
# http://en.wikipedia.org/wiki/File_Allocation_Table
invalid_chars = ['/', '\\', ':', '*', '?', '"', '<', '>', '|', '\x7F']
invalid_chars.extend([chr(x) for x in range(0, 32)])
for char in invalid_chars:
file_name = file_name.replace(char, '_')
# FAT limit is 255, leave some space for uniqueness
max_len = 250
if len(file_name) > max_len:
name, extension = os.path.splitext(file_name)
file_name = name[0:max_len - len(extension)] + extension
return file_name
class PreConditionsError(Exception):
"""
To manage a precondition error exception, the view only show a message
and restart the process
"""
pass
class PreConditionsChoose(Exception):
"""
To manage a precondition choose exception, the view need show options
to the user and continue process.
options is a dictionary with structure:
options = {}
options['parameter'] = (str) the name of the parameter to request
options['options'] = []
"""
def __init__(self, message, options):
Exception.__init__(self, message)
self.options = options
class Backend(GObject.GObject):
__gsignals__ = {
'started': (GObject.SignalFlags.RUN_FIRST, None, ([])),
'progress': (GObject.SignalFlags.RUN_FIRST, None, ([float])),
'finished': (GObject.SignalFlags.RUN_FIRST, None, ([])),
'cancelled': (GObject.SignalFlags.RUN_FIRST, None, ([]))}
def verify_preconditions(self):
raise NotImplementedError()
def start(self):
raise NotImplementedError()
def cancel(self):
raise NotImplementedError()
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