mlox/lib/lox.ml

let ( let* ) = Result.bind

module Error = Error
module Expr = Expr
module Lexer = Lexer
module Parser = Parser

type token = Lexer.token
type lox_error = Error.lox_error
type lox_value = Nil

let run (source : string) : (unit, lox_error) result =
  let* tokens = Error.of_lexer_error (Lexer.tokenize source) in
  let f token = Printf.printf "%s " (Lexer.show_token token) in
  Printf.printf "Got %d tokens\n" (List.length tokens);
  List.iter f tokens;
  print_endline "";
  let* expr = Error.of_parser_error (Parser.parse tokens) in
  Printf.printf "%s\n" (Expr.show_expr expr);
  Ok ()

let runRepl () : unit =
  try
    while true do
      print_string "> ";
      let line = read_line () in
      let result = run line in
      Result.iter_error Error.print_error result
    done
  with End_of_file -> ()