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(*
* UPEM / L3 / Functional programming / Project: URM
* Pacien TRAN-GIRARD, Adam NAILI
*)
open Common
let instptr_mk urmcmd_list =
let rec aux urmcmd_list count acc = match urmcmd_list with
| [] -> acc
| instr :: tail -> aux tail (count + 1) ((count, instr) :: acc)
in InstPtr([], List.rev (aux urmcmd_list 0 []))
let instptr_move_up = function
| InstPtr(instr :: list1, list2) -> InstPtr(list1, instr :: list2)
| x -> x
let instptr_move_down = function
| InstPtr(list1, instr :: list2) -> InstPtr(instr :: list1, list2)
| x -> x
let instptr_get = function
| InstPtr(_, x :: _) -> x
| InstPtr(_, []) -> failwith "No instruction left"
let instptr_string instptr =
let string_of_inst = function
| Zero(a) -> "Zero " ^ (string_of_int a)
| Succ(a) -> "Succ " ^ (string_of_int a)
| Copy(a, b) -> "Copy " ^ (string_of_int a) ^ " " ^ (string_of_int b)
| Jump(a, b, c) -> "Jump " ^ (string_of_int a) ^ " " ^ (string_of_int b) ^ " " ^ (string_of_int c)
in let string_of_instptr (l, inst) = (string_of_int l) ^ ": " ^ string_of_inst inst
in try string_of_instptr (instptr_get instptr) with _ -> "null"
let instptr_end = function
| InstPtr(_, []) -> true
| _ -> false
let rec instptr_jump ptr offset = match offset with
| 0 -> ptr
| _ when offset > 0 -> instptr_jump (instptr_move_up ptr) (offset - 1)
| _ -> instptr_jump (instptr_move_down ptr) (offset + 1)
|