Triangle-Tools/programs/directories.tri

let
 type Name   ~ array 6 of Char;
 type Number ~ Integer;

 proc prompt () ~
  begin
  put('N'); put('a'); put('m'); put('e');
  put('?'); put(' ')
  end;

 proc getname (var newname: Name) ~
  let var i: Integer
  in
   begin
   i := 0;
   while i < 6 do
    begin
     if eol () then
      newname[i] := ' '
     else
      get (var newname[i]);
     i := i+1
    end
   end;

 proc putname (newname: Name) ~
  let var i: Integer
  in
   begin
   i := 0;
   while i < 6 do
    begin
     put (newname[i]);
     i := i+1
    end
   end;

 type Entry     ~ record
                   number: Number,
                   name: Name
                  end;
 type Directory ~ record
                   size: Integer,
                   entry: array 100 of Entry
                  end;

 proc initialize (var dir: Directory) ~
  dir.size := 0;

 proc add (var dir: Directory,
           newname: Name,
           newnumber: Number) ~
  begin
   dir.entry[dir.size] :=
    {number ~ newnumber, name ~ newname};
   dir.size := dir.size + 1
  end;

 proc lookup (var dir: Directory,
              oldname: Name,
              var oldnumber: Number,
              var found: Boolean) ~
  let
   var i: Integer;
   var searching: Boolean
  in
   begin
    i := 0; searching := true;
    while (i < dir.size) /\ searching do
     if dir.entry[i].name = oldname then
      searching := false
     else
      i := i+1;
    found := \searching;
    if found then
     oldnumber := dir.entry[i].number
    else !skip
   end;

 var mydir: Directory

in

 begin
  initialize (var mydir);
  add (var mydir,
   ['D','a','v','i','d',' '], 6041);
  add (var mydir,
   ['M','u','f','f','y',' '], 4969);
  add (var mydir,
   ['K','i','e','r','a','n'], 6042);
  add (var mydir,
   ['A','l','e','x','a',' '], 5322);
   
  let
   const blank ~ [' ', ' ', ' ', ' ', ' ', ' '];
   var name: Name;
   var num: Number;
   var ok: Boolean
  in
   begin
    prompt ();
   	getname (var name); geteol ();
     while name \= blank do
      begin
       putname (name); put (' ');
       lookup (var mydir, name, var num, var ok);
       if ok then
        putint (num)
       else
        put ('?');
       puteol ();
       prompt ();
       getname (var name); geteol ()
     end
   end
 end