1 (*===----------------------------------------------------------------------=== 2 * Top-Level parsing and JIT Driver 3 *===----------------------------------------------------------------------===*) 4 5 (* top ::= definition | external | expression | ';' *) 6 let rec main_loop stream = 7 match Stream.peek stream with 8 | None -> () 9 10 (* ignore top-level semicolons. *) 11 | Some (Token.Kwd ';') -> 12 Stream.junk stream; 13 main_loop stream 14 15 | Some token -> 16 begin 17 try match token with 18 | Token.Def -> 19 ignore(Parser.parse_definition stream); 20 print_endline "parsed a function definition."; 21 | Token.Extern -> 22 ignore(Parser.parse_extern stream); 23 print_endline "parsed an extern."; 24 | _ -> 25 (* Evaluate a top-level expression into an anonymous function. *) 26 ignore(Parser.parse_toplevel stream); 27 print_endline "parsed a top-level expr"; 28 with Stream.Error s -> 29 (* Skip token for error recovery. *) 30 Stream.junk stream; 31 print_endline s; 32 end; 33 print_string "ready> "; flush stdout; 34 main_loop stream 35
