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

Following Jeremy Wadhams comment, I implemented a parser I hope it can help you:

https://play.golang.org/p/QV0FQLrTlyo

The idea is to set all logic operators in special keys with $ character like $and or $lte.

As an example:

{ 
   "$or":[ 
      { 
         "age":{ 
            "$lte":3
         }
      },
      { 
         "name":"Joe"
      },
      { 
         "$and":[ 
            { 
               "age":5
            },
            { 
               "age ":{ 
                  " $nin ":[ 
                     1,
                     2,
                     3
                  ]
               }
            }
         ]
      }
   ]
}

Regards.

Is translated as:

 ( age  <= 3 OR  name  = Joe  OR  ( age  = 5  AND  age  NOT IN (1,2,3) )  )