Extract signal from ECUc file.

def ecuc_extract_signal(signal_node, ns):
    # type: (_Element, str) -> canmatrix.Signal
    """Extract signal from ECUc file."""
    attributes = signal_node.findall(".//" + ns + "DEFINITION-REF")  # type: typing.Sequence[_Element]
    start_bit = None
    size = 0
    is_little = False
    # endianness = None
    # init_value = 0
    # signal_type = None
    # timeout = 0
    for attribute in attributes:
        if attribute.text.endswith("ComBitPosition"):
            start_bit = int(attribute.getparent().find(".//" + ns + "VALUE").text)
        if attribute.text.endswith("ComBitSize"):
            size = int(attribute.getparent().find(".//" + ns + "VALUE").text)
        if attribute.text.endswith("ComSignalEndianness"):
            endianness = attribute.getparent().find(".//" + ns + "VALUE").text
            is_little = "LITTLE_ENDIAN" in endianness
        if attribute.text.endswith("ComSignalInitValue"):
            init_value = int(attribute.getparent().find(".//" + ns + "VALUE").text)
        if attribute.text.endswith("ComSignalType"):
            signal_type = attribute.getparent().find(".//" + ns + "VALUE").text
        if attribute.text.endswith("ComTimeout"):
            timeout = int(attribute.getparent().find(".//" + ns + "VALUE").text)
    return canmatrix.Signal(get_element_name(signal_node, ns), start_bit=start_bit, size=size, is_little_endian=is_little)