Representing logic as data in JSON

Question

For business reasons we need to externalize some conditional logic into external files: preferably JSON.

A simple filter-by scenario could be handled by adding a node a

Answer 1

The first came to mind would be the recurisve

dict1={'$lte':'<','$nin':'not in '}

def updateOp(subdictItem):

    for ites in subdictItem:
        ops = ites
        print dict1.get(ops), subdictItem.get(ops), type(subdictItem.get(ops))
        if type(subdictItem.get(ops)) is list:
            valuelist=subdictItem.get(ops)
            strlist=' ,'.join([str(x) for x in valuelist])
            sub = dict1.get(ops) + "(" +strlist +")"
        else:
            sub = dict1.get(ops) +' ' + str(subdictItem.get(ops))
    return sub

def jsonString(input_dict):
    items=''
    itemslist=[]
    list = []
    for item in input_dict:
        op=item
        itemssublist=[]

        # print "item",op
        for subitem in input_dict.get(op):
            # print("subitem",subitem)
            for ite in subitem:
                if ite not in ('and','or'):
                    # print('ite_raw',ite,subitem.get(ite))
                    sub=''
                    if type(subitem.get(ite)) is dict:
                        sub=updateOp(subitem.get(ite))
                    else:
                        sub='=' + str(subitem.get(ite))
                    itemssublist.append(ite+sub)
                else:
                    item1=jsonString(subitem)
                    itemssublist.append(item1)

        delimiter=" "+op+ " "
        items= "("+delimiter.join(itemssublist)+")"
    return items 





if __name__ == "__main__":

    input_dict={}
    with open('ops.json','r') as f:
        input_dict=json.load(f)

    print input_dict

    test= jsonString(input_dict)

#result : (age< 3 or name=Joe or (age=5 and age not in (1 ,2 ,3)))
ops.json file:
{
   "or":[
      {
         "age":{
            "$lte":3
         }
      },
      {
         "name":"Joe"
      },
      {
         "and":[
            {
               "age":5
            },
            {
               "age ":{
                  "$nin":[
                     1,
                     2,
                     3
                  ]
               }
            }
         ]
      }
   ]
}