INNER CODE UNIT · Python

_parse_chain

gokayfem/ComfyUI-fal-API · nodes/builder_node.py:41

def _parse_chain(node_name: str, chain: str, container: type) -> Any:
    """Parse a prior chain string into ``container`` (list or dict).

    An empty/blank chain yields a fresh empty container. Anything that is not
    valid JSON of the right container type raises a clear FalApiError.
    """
    text = (chain or "").strip()
    if not text:
        return container()
    try:
        parsed = json.loads(text)
    except ValueError as err:
        logger.error("%s: invalid chain JSON: %s", node_name, err)
        raise FalApiError(node_name, f"'chain' is not valid JSON: {err}") from err
    if not isinstance(parsed, container):
        wanted = "array" if container is list else "object"
        if isinstance(parsed, dict):
            got = "object"

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