expressions.py 文件源码

def preprocess(cls, op, clauses):
        param = clauses["between"]
        if isinstance(param, list):
            param = param
        elif isinstance(param, Mapping):
            var, vals = param.items()[0]
            if isinstance(vals, list) and len(vals)==2:
                param = [var, {"literal":vals[0]}, {"literal":vals[1]}]
            else:
                Log.error("`between` parameters are expected to be in {var: [prefix, suffix]} form")
        else:
            Log.error("`between` parameters are expected to be in {var: [prefix, suffix]} form")

        return param, {
            "default": clauses["default"],
            "start": clauses["start"]
        }