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"""Utilities."""
import re
from typing import Optional, Tuple
NAMESPACES = {
"didl_lite": "urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/",
"dc": "http://purl.org/dc/elements/1.1/",
"sec": "http://www.sec.co.kr/",
"upnp": "urn:schemas-upnp-org:metadata-1-0/upnp/",
"xsi": "http://www.w3.org/2001/XMLSchema-instance",
}
def expand_namespace_tag(tag: str) -> str:
"""
Expand namespace-alias to url.
E.g.,
_ns_tag('didl_lite:item') -> '{urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/}item'
"""
if ":" not in tag:
return tag
namespace, tag = tag.split(":")
namespace_uri = NAMESPACES[namespace]
return f"{{{namespace_uri}}}{tag}"
def split_namespace_tag(namespaced_tag: str) -> Tuple[Optional[str], str]:
"""
Extract namespace and tag from namespaced-tag.
E.g., _namespace_tag('{urn:schemas-upnp-org:metadata-1-0/upnp/}class') ->
'urn:schemas-upnp-org:metadata-1-0/upnp/', 'class'
"""
if "}" not in namespaced_tag:
return None, namespaced_tag
idx = namespaced_tag.index("}")
namespace = namespaced_tag[1:idx]
tag = namespaced_tag[idx + 1 :] # noqa: E203
return namespace, tag
def to_camel_case(name: str) -> str:
"""Get camel case of name."""
sub1 = re.sub("(.)([A-Z][a-z]+)", r"\1_\2", name)
return re.sub("([a-z0-9])([A-Z])", r"\1_\2", sub1).lower()
def didl_property_key(didl_property_name: str) -> str:
"""Get Python property key for a DIDL property name."""
if ":" in didl_property_name:
# Remove the namespace from the property name
didl_property_name = didl_property_name.partition(":")[2]
if didl_property_name.startswith("@"):
return to_camel_case(didl_property_name.replace("@", ""))
return to_camel_case(didl_property_name.replace("@", "_"))
def didl_property_def_key(didl_property_def: Tuple[str, ...]) -> str:
"""Get Python property key for didl_property_def."""
if didl_property_def[1].startswith("@"):
return to_camel_case(didl_property_def[1].replace("@", ""))
return to_camel_case(didl_property_def[1].replace("@", "_"))
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