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ast.ml
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ast.ml
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(* Abstract Syntax Tree and functions for printing it *)
type op = Add | Sub | Mult | Div | Equal | Neq | Less | Leq | Greater | Geq |
And | Or | Elmult | Eldiv
type uop = Neg | Not
type expr =
Literal of int
| Fliteral of string
| BoolLit of bool
| StrLit of string
| Id of string
| Binop of expr * op * expr
| Unop of uop * expr
| Assign of expr * expr
| Call of string * expr list
| Mat of expr list list
| Col of string
| Row of string
| Tran of string
| Access of string * expr * expr
| Noexpr
type typ =
Void
| Int
| Bool
| Float
| String
| Matrix of typ * int * int
type bind = typ * string
type stmt =
Block of stmt list
| Expr of expr
| Return of expr
| If of expr * stmt * stmt
| For of expr * expr * expr * stmt
| While of expr * stmt
type func_decl = {
typ : typ;
fname : string;
formals : bind list;
locals : bind list;
body : stmt list;
}
type program = bind list * func_decl list
(* Pretty-printing functions *)
let string_of_op = function
Add -> "+"
| Sub -> "-"
| Mult -> "*"
| Div -> "/"
| Elmult -> ".*"
| Eldiv -> "./"
| Equal -> "=="
| Neq -> "!="
| Less -> "<"
| Leq -> "<="
| Greater -> ">"
| Geq -> ">="
| And -> "&&"
| Or -> "||"
let string_of_uop = function
Neg -> "-"
| Not -> "!"
let rec string_of_expr = function
Literal(l) -> string_of_int l
| Fliteral(l) -> l
| BoolLit(true) -> "true"
| BoolLit(false) -> "false"
| StrLit(l) -> "\"" ^ (String.escaped l) ^ "\""
| Mat(_) -> "matLit"
| Id(s) -> s
| Binop(e1, o, e2) ->
string_of_expr e1 ^ " " ^ string_of_op o ^ " " ^ string_of_expr e2
| Unop(o, e) -> string_of_uop o ^ string_of_expr e
| Assign(v, e) -> string_of_expr v ^ " = " ^ string_of_expr e
| Call(f, el) ->
f ^ "(" ^ String.concat ", " (List.map string_of_expr el) ^ ")"
| Col(s) -> s ^ ".col"
| Row(s) -> s ^ ".row"
| Tran(s) -> s ^ ".T"
| Access(s, r, c) -> s ^ "[" ^ string_of_expr r ^ "]" ^ "[" ^ string_of_expr c ^ "]"
| Noexpr -> ""
let rec string_of_stmt = function
Block(stmts) ->
"{\n" ^ String.concat "" (List.map string_of_stmt stmts) ^ "}\n"
| Expr(expr) -> string_of_expr expr ^ ";\n";
| Return(expr) -> "return " ^ string_of_expr expr ^ ";\n";
| If(e, s, Block([])) -> "if (" ^ string_of_expr e ^ ")\n" ^ string_of_stmt s
| If(e, s1, s2) -> "if (" ^ string_of_expr e ^ ")\n" ^
string_of_stmt s1 ^ "else\n" ^ string_of_stmt s2
| For(e1, e2, e3, s) ->
"for (" ^ string_of_expr e1 ^ " ; " ^ string_of_expr e2 ^ " ; " ^
string_of_expr e3 ^ ") " ^ string_of_stmt s
| While(e, s) -> "while (" ^ string_of_expr e ^ ") " ^ string_of_stmt s
let string_of_typ = function
Int -> "int"
| Bool -> "bool"
| Float -> "float"
| Void -> "void"
| String -> "String"
| Matrix(_, r, c) -> "matrix [" ^ (string_of_int r) ^ "][" ^ string_of_int c ^ "]"
let string_of_vdecl (t, id) = string_of_typ t ^ " " ^ id ^ ";\n"
let string_of_fdecl fdecl =
"def" ^ " " ^ string_of_typ fdecl.typ ^ " " ^
fdecl.fname ^ "(" ^ String.concat ", " (List.map snd fdecl.formals) ^
")\n{\n" ^
String.concat "" (List.map string_of_vdecl fdecl.locals) ^
String.concat "" (List.map string_of_stmt fdecl.body) ^
"}\n"
let string_of_program (vars, funcs) =
String.concat "" (List.map string_of_vdecl vars) ^ "\n" ^
String.concat "\n" (List.map string_of_fdecl funcs)