Please help me decide about extending syntax for jmespath

[Thaina]

I am in process of starting new project extending jmespath with more syntax. Currently now I work on basic jmespath and extend it to support math operation + - * / % with antlr. I got the antlr file from https://github.com/burtcorp/jmespath-java

I am now stuck on design decision and wish that you could kindly help me with some suggestion

• Should I support bitwise operation with && || ^ ?

  • Is it acceptable to use && and || as bitwise operator?
    • 1 || 2 will return 3 for instance
  • And still wonder is it really necessary, especially xor operator ^
    • But if I include this ^ operator, it also support boolean xor in addition to && and ||

• Should I bring back root node $ from jsonpath?

• Should I bring back ** operator from jsonpath?

• Should I support ternary condition ? true : false operator ?

• Should I support ?? and ?! operator ?

  • And remove support on && || for null check in the same manner of js
    • It might be used as bitwise operator above instead
  • One difference is it will not treat false as null. Only null and empty

• I would like to add support to backtracing to parent node with @.. syntax

  • nth number of dots - 1 will backtrack to nth parent
    • $.me.obj.. is equal to $.me
    • $.me.obj... is equal to $
  • Is there any better syntax for this ?

• I would like to add support to index value with # symbol

  • For array, # would be index number 0,1,2,...
  • For object, # would be string "{key}"
  • What should I do for deep reference ?
    • # for current level, ## for previous level ?
      • $.me.obj[0].# return 0
      • $.me.obj[0].## return "obj"
      • $.me.obj[0].### return "me"
    • # for current level, ..# for previous level ?
      • $.me.obj[0].# return 0
      • $.me.obj[0]..# return "obj"
      • $.me.obj[0]...# return "me"
    • # for current level, ## will be fullpath as array?
      • $.me.obj[0].# return 0
      • $.me.obj[0].## return ["me","obj",0]
  • What should I do for slice and query? # will be index of sliced iteration or actual index?

• I would like to support object projection key by expression Should multiselect hash accept expressions as keys #64

• Any other idea overall? Any other things you don't satisfied with jmespath?

[FelixReuthlingerBMW]

Even just having the basic math would be fantastic!