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|
# standard imports
import os
import typing
import urllib
# bsie imports
from bsie.utils import bsfs
# inner-module imports
from . import nodes
from .matcher import Matcher
# exports
__all__: typing.Sequence[str] = (
'DefaultMatcher',
)
## code ##
class DefaultMatcher(Matcher):
"""Compose URIs as <host/user/node_type#fragment>
What information is used as fragment depends on the node type.
Typically, the default is to use the "ucid" hint.
The fallback in all cases is to generate a random uuid.
Never changes previously assigned uris. Sets uris in-place.
"""
def __init__(
self,
host: bsfs.URI,
user: str,
):
self._prefix = bsfs.Namespace(os.path.join(host, user))
def match_node(self, node: nodes.Node) -> nodes.Node:
if node.uri is not None:
return node
if isinstance(node, nodes.Entity):
return self.match_entity(node)
if isinstance(node, nodes.Preview):
return self.match_preview(node)
if isinstance(node, nodes.Tag):
return self.match_tag(node)
if isinstance(node, nodes.Face):
return self.match_face(node)
raise ValueError(f'no matching policy available for bsfs.typename{node}')
def match_entity(self, node: nodes.Entity) -> nodes.Entity:
"""Set a bsn:Entity node's uri fragment to its ucid."""
node.uri = getattr(self._prefix.file(), node.ucid)
return node
def match_preview(self, node: nodes.Preview) -> nodes.Preview:
"""Set a bsn:Preview node's uri fragment to its ucid and size suffix."""
fragment = node.ucid + '_s' + str(node.size)
node.uri = getattr(self._prefix.preview(), fragment)
return node
def match_tag(self, node: nodes.Tag) -> nodes.Tag:
"""Set a bsn:Tag node's uri to its label."""
# FIXME: match to existing tags in bsfs storage?!
fragment = urllib.parse.quote(node.label)
node.uri = getattr(self._prefix.tag(), fragment)
return node
def match_face(self, node: nodes.Face) -> nodes.Face:
"""Set a bsn:Face node's uri to its ucid."""
node.uri = getattr(self._prefix.face(), node.ucid)
return node
## EOF ##
|
