errormsg.sml

signature ERRORMSG =
sig
    val anyErrors : bool ref
    val fileName : string ref
    val lineNum : int ref
    val linePos : int list ref
    val sourceStream : TextIO.instream ref
    val error : int -> string -> unit
    exception Error
    val impossible : string -> 'a   (* raises Error *)
    val reset : unit -> unit
end

structure ErrorMsg : ERRORMSG =
struct

  val anyErrors = ref false
  val fileName = ref ""
  val lineNum = ref 1
  val linePos = ref [1]
  val sourceStream = ref TextIO.stdIn

  fun reset() = (anyErrors:=false;
		 fileName:="";
		 lineNum:=1;
		 linePos:=[1];
		 sourceStream:=TextIO.stdIn)

  exception Error

  fun error pos (msg:string) =
      let fun look(a::rest,n) =
		if a<pos then app print [":",
				       Int.toString n,
				       ".",
				       Int.toString (pos-a)]
		       else look(rest,n-1)
	    | look _ = print "0.0"
       in anyErrors := true;
	  print (!fileName);
	  look(!linePos,!lineNum);
	  print ":";
	  print msg;
	  print "\n"
      end

  fun impossible msg =
      (app print ["Error: Compiler bug: ",msg,"\n"];
       TextIO.flushOut TextIO.stdOut;
       raise Error)

end  (* structure ErrorMsg *)