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import logging
import unicodedata
from collections.abc import Iterable, MutableMapping, MutableSequence
from typing import Any, Final, Optional, Union, cast
from urllib.parse import urldefrag, urlsplit
import rdflib
import rdflib.namespace
from rdflib import Graph, URIRef
from rdflib.namespace import RDF, RDFS
from ruamel.yaml.comments import CommentedMap, CommentedSeq
from .exceptions import SchemaException
from .utils import ContextType, aslist, json_dumps
_logger = logging.getLogger("salad")
def pred(
datatype: MutableMapping[str, Union[dict[str, str], str]],
field: Optional[dict[str, Any]],
name: str,
context: ContextType,
defaultBase: str,
namespaces: dict[str, rdflib.namespace.Namespace],
) -> Union[dict[str, Optional[str]], str]:
split: Final = urlsplit(name)
vee: Optional[str] = None
if split.scheme != "":
vee = name
(ns, ln) = rdflib.namespace.split_uri(str(vee))
name = ln
if ns[0:-1] in namespaces:
vee = str(namespaces[ns[0:-1]][ln])
_logger.debug("name, v %s %s", name, vee)
v: Optional[Union[dict[str, Optional[str]], str]] = None
if field is not None and "jsonldPredicate" in field:
if isinstance(field["jsonldPredicate"], MutableMapping):
v = {}
for k, val in field["jsonldPredicate"].items():
v[("@" + k[1:] if k.startswith("_") else k)] = val
if "@id" not in v:
v["@id"] = vee
else:
v = field["jsonldPredicate"]
elif "jsonldPredicate" in datatype:
if isinstance(datatype["jsonldPredicate"], Iterable):
for d in datatype["jsonldPredicate"]:
if isinstance(d, MutableMapping):
if d["symbol"] == name:
v = d["predicate"]
else:
raise SchemaException(
"entries in the jsonldPredicate List must be " "Dictionaries"
)
else:
raise SchemaException("jsonldPredicate must be a List of Dictionaries.")
ret = v or vee
if not ret:
ret = defaultBase + name
if name in context:
if context[name] != ret:
raise SchemaException(f"Predicate collision on {name}, {context[name]!r} != {ret!r}")
else:
_logger.debug("Adding to context '%s' %s (%s)", name, ret, type(ret))
context[name] = ret
return ret
def process_type(
t: MutableMapping[str, Any],
g: Graph,
context: ContextType,
defaultBase: str,
namespaces: dict[str, rdflib.namespace.Namespace],
defaultPrefix: str,
) -> None:
if t["type"] not in ("record", "enum"):
return
if "name" in t:
recordname = t["name"]
_logger.debug("Processing %s %s\n", t.get("type"), t)
classnode: Final = URIRef(recordname)
g.add((classnode, RDF.type, RDFS.Class))
split: Final = urlsplit(recordname)
predicate = recordname
if t.get("inVocab", True):
if split.scheme:
(ns, ln) = rdflib.namespace.split_uri(str(recordname))
predicate = recordname
recordname = ln
else:
predicate = f"{defaultPrefix}:{recordname}"
if context.get(recordname, predicate) != predicate:
raise SchemaException(
f"Predicate collision on {recordname!r}, "
f"{context[recordname]!r} != {predicate!r}"
)
if not recordname:
raise SchemaException(f"Unable to find/derive recordname for {t}")
_logger.debug("Adding to context '%s' %s (%s)", recordname, predicate, type(predicate))
context[recordname] = predicate
if t["type"] == "record":
for i in t.get("fields", []):
fieldname = i["name"]
_logger.debug("Processing field %s", i)
v: Union[dict[Any, Any], str, None] = pred(
t, i, fieldname, context, defaultPrefix, namespaces
)
if isinstance(v, str):
v = v if v[0] != "@" else None
elif v is not None:
v = v["_@id"] if v.get("_@id", "@")[0] != "@" else None
if bool(v):
try:
(ns, ln) = rdflib.namespace.split_uri(str(v))
except ValueError:
# rdflib 5.0.0 compatibility
uri = str(v)
colon_index = str(v).rfind(":")
if colon_index < 0:
raise
split_start = rdflib.namespace.SPLIT_START_CATEGORIES
for j in range(-1 - colon_index, len(uri)):
if unicodedata.category(uri[j]) in split_start or uri[j] == "_":
# _ prevents early split, roundtrip not generate
ns = uri[:j]
if not ns:
break
ln = uri[j:]
break
if not ns or not ln:
raise
if ns[0:-1] in namespaces:
propnode = namespaces[ns[0:-1]][ln]
else:
propnode = URIRef(v)
g.add((propnode, RDF.type, RDF.Property))
g.add((propnode, RDFS.domain, classnode))
# TODO generate range from datatype.
if isinstance(i["type"], MutableMapping):
process_type(i["type"], g, context, defaultBase, namespaces, defaultPrefix)
if "extends" in t:
for e in aslist(t["extends"]):
g.add((classnode, RDFS.subClassOf, URIRef(e)))
elif t["type"] == "enum":
_logger.debug("Processing enum %s", t.get("name"))
for i in t["symbols"]:
pred(t, None, i, context, defaultBase, namespaces)
def salad_to_jsonld_context(
j: Iterable[MutableMapping[str, Any]], schema_ctx: MutableMapping[str, Any]
) -> tuple[ContextType, Graph]:
context: Final[ContextType] = {}
namespaces: Final = {}
g: Final = Graph()
defaultPrefix: Final = ""
for k, v in schema_ctx.items():
context[k] = v
namespaces[k] = rdflib.namespace.Namespace(v)
if "@base" in context:
defaultBase = cast(str, context["@base"])
del context["@base"]
else:
defaultBase = ""
for k, v in namespaces.items():
g.bind(str(k), v)
for t in j:
process_type(t, g, context, defaultBase, namespaces, defaultPrefix)
return (context, g)
def fix_jsonld_ids(obj: Union[CommentedMap, float, str, CommentedSeq], ids: list[str]) -> None:
"""Add missing identity entries."""
if isinstance(obj, MutableMapping):
for i in ids:
if i in obj:
obj["@id"] = obj[i]
for v in obj.values():
fix_jsonld_ids(v, ids)
if isinstance(obj, MutableSequence):
for entry in obj:
fix_jsonld_ids(entry, ids)
def makerdf(
workflow: Optional[str],
wf: Union[CommentedMap, float, str, CommentedSeq],
ctx: ContextType,
graph: Optional[Graph] = None,
) -> Graph:
prefixes: Final = {}
idfields: Final = []
for k, v in ctx.items():
if isinstance(v, MutableMapping):
url = v["@id"]
else:
url = v
if url == "@id":
idfields.append(k)
doc_url, frg = urldefrag(url)
if "/" in frg:
p = frg.split("/")[0]
prefixes[p] = f"{doc_url}#{p}/"
fix_jsonld_ids(wf, idfields)
g: Final = Graph() if graph is None else graph
if isinstance(wf, MutableSequence):
for w in wf:
w["@context"] = ctx
g.parse(
data=json_dumps(w, default=str),
format="json-ld",
publicID=str(workflow),
)
elif isinstance(wf, MutableMapping):
wf["@context"] = ctx
g.parse(data=json_dumps(wf, default=str), format="json-ld", publicID=str(workflow))
else:
raise SchemaException(f"{wf} is not a workflow")
# Bug in json-ld loader causes @id fields to be added to the graph
for sub, pred, obj in g.triples((None, URIRef("@id"), None)):
g.remove((sub, pred, obj))
for k2, v2 in prefixes.items():
g.namespace_manager.bind(k2, v2)
return g
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