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# SPDX-FileCopyrightText: 2021-2023 Blender Authors
#
# SPDX-License-Identifier: GPL-2.0-or-later
__all__ = (
"property_definition_from_data_path",
"decompose_data_path",
)
class _TokenizeDataPath:
"""
Class to split up tokens of a data-path.
Note that almost all access generates new objects with additional paths,
with the exception of iteration which is the intended way to access the resulting data."""
__slots__ = (
"data_path",
)
def __init__(self, attrs):
self.data_path = attrs
def __getattr__(self, attr):
return _TokenizeDataPath(self.data_path + ((".{:s}".format(attr)),))
def __getitem__(self, key):
return _TokenizeDataPath(self.data_path + (("[{!r}]".format(key)),))
def __call__(self, *args, **kw):
value_str = ", ".join([
val for val in (
", ".join(repr(value) for value in args),
", ".join(["{:s}={!r}".format(key, value) for key, value in kw.items()]),
) if val])
return _TokenizeDataPath(self.data_path + ('({:s})'.format(value_str), ))
def __iter__(self):
return iter(self.data_path)
def decompose_data_path(data_path):
"""
Return the components of a data path split into a list.
"""
ns = {"base": _TokenizeDataPath(())}
return list(eval("base" + data_path, ns, ns))
def property_definition_from_data_path(base, data_path):
"""
Return an RNA property definition from an object and a data path.
In Blender this is often used with ``context`` as the base and a
path that it references, for example ``.space_data.lock_camera``.
"""
data = decompose_data_path(data_path)
while data and (not data[-1].startswith(".")):
data.pop()
if (not data) or (not data[-1].startswith(".")) or (len(data) < 2):
return None
data_path_head = "".join(data[:-1])
data_path_tail = data[-1]
value_head = eval("base" + data_path_head)
value_head_rna = getattr(value_head, "bl_rna", None)
if value_head_rna is None:
return None
value_tail = value_head.bl_rna.properties.get(data_path_tail[1:])
if not value_tail:
return None
return value_tail
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