Convert string to mongo query format

Question

I am trying to build advance search functionality. I want to convert the input string into mongodb query format.

for example, the input

'status = confirmed AND (assignee = xyz OR priority = low)'

Should be converted to output:

{
  and : [{
    status : 'confirmed'  
  }, {
    or: [
      {assignee: xyz},
      {priority: low}
    ]
  }]
}