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# Copyright (c) 2019, Riverbank Computing Limited
# All rights reserved.
#
# This copy of SIP is licensed for use under the terms of the SIP License
# Agreement. See the file LICENSE for more details.
#
# This copy of SIP may also used under the terms of the GNU General Public
# License v2 or v3 as published by the Free Software Foundation which can be
# found in the files LICENSE-GPL2 and LICENSE-GPL3 included in this package.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import os
import sys
class UserException(Exception):
""" An exception capturing user friendly information. """
def __init__(self, text, *, detail=None):
""" Initialise the exception with its user friendly text and the
optional detail.
"""
super().__init__()
self.text = text
self.detail = detail
class UserFileException(UserException):
""" An exception related to a specific file. """
def __init__(self, filename, text, *, detail=None):
""" Initialise the exception. """
super().__init__("{0}: {1}".format(filename, text), detail=detail)
class UserParseException(UserFileException):
""" An exception related to the parsing of a specific file. """
def __init__(self, filename, *, detail=None):
""" Initialise the exception. """
super().__init__(filename, "unable to parse file", detail=detail)
def handle_exception(e):
""" Tell the user about an exception. """
if isinstance(e, UserException):
# An "expected" exception.
if e.detail is not None:
message = "{0}: {1}".format(e.text, e.detail)
else:
message = e.text
print("{0}: {1}".format(os.path.basename(sys.argv[0]), message),
file=sys.stderr)
sys.exit(1)
# An internal error.
print(
"{0}: An internal error occurred...".format(
os.path.basename(sys.argv[0])),
file=sys.stderr)
raise e
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