MAKE_VALUE macro rg, rb

   local    Value

   Value = (rg shl 4) or rb 
   exitm %Value  

endm


BASE8              EQU     1
BASE16             EQU     2

VAL_1           EQU     MAKE_VALUE(BASE8, 1)
VAL_2           EQU     MAKE_VALUE(BASE8, 2)


; testing the waters....

mov    eax, VAL_1   ; EAX = (1 << 4) or 1
mov         eax, VAL_2   ; EAX = (1 << 4) or 2    

struc MAKE_VALUE rg, rb { . equ ((rg) shl 4 or (rb)) }

BASE8   equ     1
BASE16  equ     2
VAL_1   MAKE_VALUE BASE8, 1
VAL_2   MAKE_VALUE BASE8, 2

mov     eax, VAL_1   ; EAX = (1 << 4) or 1
mov     eax, VAL_2   ; EAX = (1 << 4) or 2    

struc reequ [val] {
common
  restore .
  . equ val
}

macro ^ [args] {
common
  local head, expr, tail, matched
  head equ
  expr equ
  tail equ
  matched equ 0
  match _head =~ _expr =~ _tail, args \{
    head reequ _head
    expr reequ _expr
    tail reequ _tail
    matched reequ 1
  \}
  match =0 _head =~ _expr =~, matched args \{
    head reequ _head
    expr reequ _expr
    matched reequ 1
  \}
  match =0 =~ _expr =~ _tail, matched args \{
    expr reequ _expr
    tail reequ _tail
    matched reequ 1
  \}
  match =1, matched \{
    \local val
    match _expr, expr \\{
      val _expr
      head val tail
    \\}
    restore val
  \}
  match =0, matched \{ args \}
  restore head, expr, tail, matched
}

struc RGB r, g, b { . equ (((r) shl 8 or (g)) shl 8 or (b)) }

^       mov     eax, ~RGB 1,2,3~+0xFF000000
^ magenta = ~RGB 255, 0, 255~
        mov     ecx, magenta