Return anonymous structure from expression macro

Given a map Map<String, Int> how can I create anonymous structure from expression macro?

This is what I am trying to achieve:

var res = myMacroFunc(["var1"=>12, "var2"=>66]);

res == {var1: 12, var2: 66}

There might be a cleaner way to do this... but you can iterate through each expression in the array declaration, use switch statement to match $a => $b and generate ObjectField. Store all ObjectFields in an array to create a EObjectDecl.

Here's a working version in Haxe Playground.

public static macro function myMacroFunc(e:haxe.macro.Expr):haxe.macro.Expr {
  final objects = [];
  switch (e.expr) {
    // input is array decl
    case EArrayDecl(values):
      {
        for (v in values) {
          switch (v) {
            // match expression of format $a => $b
            case macro $a => $b: {
                switch (a.expr) {
                  // "a" must be a string constant, so we extract that
                  case EConst(CString(s, _)): {
                      objects.push({field: s, expr: b});
                    }
                  case _: {}
                }
              }
            case _: {}
          }
        }
      }
    case _:
      {}
  }

  return {
    pos: e.pos, // re-use input position
    expr: EObjectDecl(objects) // pass to EObjectDecl
  };
}