type loc = string * int * int * int * int

type monop = Neg | Not
type binop = Add | Sub | Mul | Div | Mod
           | Eq | Ne | Lt | Le | Gt | Ge
           | And | Or
type ctype = Void | Bool | Int | Float
           | ArrayDec of ctype * string list
           | ArrayDef of ctype * node list
and node =
    (* global *)
    | Program of node list * loc
    | Param of ctype * string
    | FunDec of ctype * string * node list
    | FunDef of bool * ctype * string * node list * node list
    | GlobalDec of ctype * string
    | GlobalDef of bool * ctype * string * node option

    (* statements *)
    | VarDec of ctype * string * node option
    | Assign of string * node
    | Return of node
    | If of node * node list
    | IfElse of node * node list * node list
    | While of node * node list
    | DoWhile of node * node list
    | For of string * node * node * node * node list
    | Allocate of string * node list
    | Expr of node
    | Statements of node list

    (* expressions *)
    | BoolConst of bool
    | IntConst of int
    | FloatConst of float
    | ArrayConst of node list
    | ArrayScalar of node
    | Var of string
    | Deref of string * node list
    | Monop of monop * node
    | Binop of binop * node * node
    | Cond of node * node * node
    | TypeCast of ctype * node
    | FunCall of string * node list

(* intermediate representations between phases *)
type repr =
    | Inputfile of string option * int  (* filename, verbose *)
    | Node of node * int                (* ast, verbose *)
    | Assembly of string list * int     (* instructions *)

exception LocError of string * loc

exception CompileError of string


(*
 * Template for node matching follows below.
 *
 * let rec visit = function
 *     | Program (decls, loc) ->
 *     | Param (ctype, name, loc) ->
 *     | FunDec (ret_type, name, params, loc) ->
 *     | FunDef (export, ret_type, name, params, body, loc) ->
 *     | GlobalDec (ctype, name, loc) ->
 *     | GlobalDef (export, ctype, name, None, loc) ->
 *     | GlobalDef (export, ctype, name, Some init, loc) ->
 *
 *     | VarDec (ctype, name, None, loc) ->
 *     | VarDec (ctype, name, Some init, loc) ->
 *     | Assign (name, value, loc) ->
 *     | Return (value, loc) ->
 *     | If (cond, body, loc) ->
 *     | IfElse (cond, true_body, false_body, loc) ->
 *     | While (cond, body, loc) ->
 *     | DoWhile (cond, body, loc) ->
 *     | For (counter, start, stop, step, body, loc) ->
 *     | Expr (value, loc) ->
 *
 *     | BoolConst (value, loc) ->
 *     | IntConst (value, loc) ->
 *     | FloatConst (value, loc) ->
 *     | Var (name, loc) ->
 *     | Monop (op, value, loc) ->
 *     | Binop (op, left, right, loc) ->
 *     | Cond (cond, true_expr, false_expr, loc) ->
 *     | TypeCast (ctype, value, loc) ->
 *     | FunCall (name, args, loc) ->
 *
 *     | Statements (stats, loc) ->
 *
 *     | node -> transform visit node
 *
 *)