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|
import yaml
from ._extension import Extension
from ._tag import TagDefinition
class ManifestExtension(Extension):
"""
Extension implementation that reads the extension URI, ASDF
Standard requirement, and tag list from a manifest document.
Parameters
----------
manifest : dict
Parsed manifest.
converters : iterable of asdf.extension.Converter, optional
Converter instances for the tags and Python types
supported by this extension.
compressors : iterable of asdf.extension.Compressor, optional
Compressor instances to support additional binary
block compression options.
legacy_class_names : iterable of str, optional
Fully-qualified class names used by older versions
of this extension.
"""
@classmethod
def from_uri(cls, manifest_uri, **kwargs):
"""
Construct the extension using the manifest with the
specified URI. The manifest document must be registered
with ASDF's resource manager.
Parameters
----------
manifest_uri : str
Manifest URI.
See the class docstring for details on keyword parameters.
"""
from ..config import get_config
manifest = yaml.safe_load(get_config().resource_manager[manifest_uri])
return cls(manifest, **kwargs)
def __init__(self, manifest, *, legacy_class_names=None, converters=None, compressors=None):
self._manifest = manifest
if legacy_class_names is None:
self._legacy_class_names = []
else:
self._legacy_class_names = legacy_class_names
if converters is None:
self._converters = []
else:
self._converters = converters
if compressors is None:
self._compressors = []
else:
self._compressors = compressors
@property
def extension_uri(self):
return self._manifest["extension_uri"]
@property
def legacy_class_names(self):
return self._legacy_class_names
@property
def asdf_standard_requirement(self):
version = self._manifest.get("asdf_standard_requirement", None)
if version is None:
return None
elif isinstance(version, str):
return f"=={version}"
else:
specifiers = []
for prop, operator in [("gt", ">"), ("gte", ">="), ("lt", "<"), ("lte", "<=")]:
value = version.get(prop)
if value:
specifiers.append(f"{operator}{value}")
return ",".join(specifiers)
@property
def converters(self):
return self._converters
@property
def compressors(self):
return self._compressors
@property
def tags(self):
result = []
for tag in self._manifest.get("tags", []):
if isinstance(tag, str):
# ExtensionProxy knows how to handle str tags.
result.append(tag)
elif isinstance(tag, dict):
result.append(
TagDefinition(
tag["tag_uri"],
schema_uris=tag.get("schema_uri"),
title=tag.get("title"),
description=tag.get("description"),
)
)
else:
raise TypeError("Malformed manifest document")
return result
|
