exception LexerException of string
let lexer_token_safe lexbuf =
    try Lexer.token lexbuf
    with Failure s -> raise (LexerException s)

let render tmppath finalpath tree =
    let outtex = Util.mapjoin Texutil.render_tex tree in
    let md5 = Digest.to_hex (Digest.string outtex) in
    begin
	let mathml = Mathml.render tree
	and html = Html.render tree
	in print_string (match (html,!Html.conservativeness,mathml) with
	    None,_,None -> "+" ^ md5 
	  | Some h,Html.CONSERVATIVE,None -> "c" ^ md5  ^ h
	  | Some h,Html.MODERATE,None -> "m" ^ md5  ^ h
	  | Some h,Html.LIBERAL,None -> "l" ^ md5  ^ h
	  | Some h,Html.CONSERVATIVE,Some m -> "C" ^ md5  ^ h ^ "\000" ^ m
	  | Some h,Html.MODERATE,Some m -> "M" ^ md5  ^ h ^ "\000" ^ m
	  | Some h,Html.LIBERAL,Some m -> "L" ^ md5 ^ h ^ "\000" ^ m
	  | None,_,Some m -> "X" ^ md5   ^ m
	);
	Render.render tmppath finalpath outtex md5
    end
let _ =
    Texutil.set_encoding (try Sys.argv.(4) with _ -> "UTF-8");
    try render Sys.argv.(1) Sys.argv.(2) (Parser.tex_expr lexer_token_safe (Lexing.from_string Sys.argv.(3)))
    with Parsing.Parse_error -> print_string "S"
       | LexerException _ -> print_string "E"
       | Texutil.Illegal_tex_function s -> print_string ("F" ^ s)
       | Util.FileAlreadyExists -> print_string "-"
       | Invalid_argument _ -> print_string "-"
       | Failure _ -> print_string "-"
       | Render.ExternalCommandFailure s -> ()
       | _ -> print_string "-"