check-ios-bus/Utilities/platform/2/generation/pipeBusSource.py

def pipeBusSource(name, entity, busKey, structure, fmtBusPipe, fmtBusPipeToggle):
    valueType = structure.model.fields[name][0]
    fmt = fmtBusPipe
    if "toggle" in entity.pipes[name]:
        fmt = fmtBusPipeToggle

    return fmt \
        .replace("%BUS_KEY%", busKey) \
        .replace("%BUS_VALUE_TYPE%", valueType)