Nested simple_expression objects are not parsed

[AntoineGautier]

I am opening this issue for reference. It comes from a chat discussion with @JayHuLBL.

Nested function calls are not parsed into funArgsObjExp objects but are simply returned as strings as below.

Case of a function call nested into another function call:

{
    "name": "max",
    "arguments": [
      {
        "name": "{sum({(if [object Object] then 1 else 0) for j in 1:nEqu}) for i in 1:nSta}"
      }
    ]
  }

Case of a function call nested into a string expression:

  "expression": {
    "simple_expression": "capCoo_nominal/abs(TChiWatSup_nominal -TChiWatRet_nominal)/ctl.cp_default/ctl.rho_default"
  }

The same issue is observed with nested ifExpressionObj objects, and is likely common to all simple_expression objects.

  "expression": {
    "simple_expression": "(THeaWatRet_nominal -THeaWatSup_nominal)*(if ctl.have_hrc then 0.5 else 1)"
  }