Jonathon Broughton
73a44c6d5c
build and deploy Speckle functions / publish-automate-function-version (push) Has been cancelled
72 lines
3.3 KiB
Python
72 lines
3.3 KiB
Python
"""Helper module for a simple speckle object tree flattening."""
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from typing import Tuple, Optional, List
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from specklepy.objects import Base
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from specklepy.objects.other import Instance, Transform
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# def flatten_base(base: Base) -> Iterable[Base]:
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# """Take a base and flatten it to an iterable of bases."""
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# if hasattr(base, "elements") and base["elements"] is not None:
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# for element in base["elements"]:
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# yield from flatten_base(element)
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# yield base
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def extract_base_and_transform(
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base: Base,
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inherited_instance_id: Optional[str] = None,
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transform_list: Optional[List[Transform]] = None,
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) -> Tuple[Base, str, Optional[List[Transform]]]:
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"""
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Traverses Speckle object hierarchies to yield `Base` objects and their transformations.
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Tailored to Speckle's AEC data structures, it covers the newer hierarchical structures
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with Collections and also with patterns found in older Revit specific data.
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Parameters:
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- base (Base): The starting point `Base` object for traversal.
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- inherited_instance_id (str, optional): The inherited identifier for `Base` objects without a unique ID.
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- transform_list (List[Transform], optional): Accumulated list of transformations from parent to child objects.
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Yields:
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- tuple: A `Base` object, its identifier, and a list of applicable `Transform` objects or None.
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The id of the `Base` object is either the inherited identifier for a definition from an instance
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or the one defined in the object.
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"""
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# Derive the identifier for the current `Base` object, defaulting to an inherited one if needed.
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current_id = getattr(base, "id", inherited_instance_id)
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transform_list = transform_list or []
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if isinstance(base, Instance):
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# Append transformation data and dive into the definition of `Instance` objects.
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if base.transform:
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transform_list.append(base.transform)
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if base.definition:
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yield from extract_base_and_transform(
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base.definition, current_id, transform_list.copy()
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)
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else:
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# Initial yield for the current `Base` object.
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yield base, current_id, transform_list
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# Process 'elements' and '@elements', typical containers for `Base` objects in AEC models.
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elements_attr = getattr(base, "elements", []) or getattr(base, "@elements", [])
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for element in elements_attr:
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if isinstance(element, Base):
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# Recurse into each `Base` object within 'elements' or '@elements'.
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yield from extract_base_and_transform(
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element, current_id, transform_list.copy()
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)
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# Recursively process '@'-prefixed properties that are Base objects with 'elements'.
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# This is a common pattern in older Speckle data models, such as those used for Revit commits.
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for attr_name in dir(base):
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if attr_name.startswith("@"):
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attr_value = getattr(base, attr_name)
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# If the attribute is a Base object containing 'elements', recurse into it.
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if isinstance(attr_value, Base) and hasattr(attr_value, "elements"):
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yield from extract_base_and_transform(
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attr_value, current_id, transform_list.copy()
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)
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