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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
from ...utils.uris import as_file
class Location(object):
"""
Base class for ARIA locations.
Locations are used by :class:`~aria.parser.loading.LoaderSource` to delegate to
an appropriate :class:`~aria.parser.loading.Loader`.
"""
def is_equivalent(self, location):
raise NotImplementedError
@property
def prefix(self):
return None
class UriLocation(Location):
"""
A URI location can be absolute or relative, and can include a scheme or not.
If no scheme is included, it should be treated as a filesystem path.
See :class:`~aria.parser.loading.UriTextLoader`.
"""
def __init__(self, uri):
self.uri = uri
def is_equivalent(self, location):
return isinstance(location, UriLocation) and (location.uri == self.uri)
@property
def prefix(self):
prefix = os.path.dirname(self.uri)
if prefix and (as_file(prefix) is None):
# Yes, it's weird, but dirname handles URIs,
# too: http://stackoverflow.com/a/35616478/849021
# We just need to massage it with a trailing slash
prefix += '/'
return prefix
def __str__(self):
return self.uri
class LiteralLocation(Location):
"""
A location that embeds content.
See :class:`~aria.parser.loading.LiteralLoader`.
"""
def __init__(self, content, name='literal'):
self.content = content
self.name = name
def is_equivalent(self, location):
return isinstance(location, LiteralLocation) and (location.content == self.content)
def __str__(self):
return '<%s>' % self.name
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