str_stream.sa

 
---------------------------> Sather 1.1 source file <--------------------------
-- Author: Benedict A. Gomes <gomes@samosa.ICSI.Berkeley.EDU>
-- Copyright (C) 1995, International Computer Science Institute
-- $Id: str_stream.sa,v 1.2 1996/04/09 10:05:57 borisv Exp $
--
-- COPYRIGHT NOTICE: This code is provided WITHOUT ANY WARRANTY
-- and is subject to the terms of the SATHER LIBRARY GENERAL PUBLIC
-- LICENSE contained in the file: Sather/Doc/License of the
-- Sather distribution. The license is also available from ICSI,
-- 1947 Center St., Suite 600, Berkeley CA 94704, USA.


class STR_STREAM < $OSTREAM, $STR 
class STR_STREAM < $OSTREAM, $STR is
   -- An output stream that writes out to a string (an FSTR, for
   -- efficiency). Very similar to a file.
   -- 
   -- Usage:
   --    write_to_stream(o: $OUTSTREAM) is
   --        o + "this is a test";
   --    end;
   --    Which can be invoked using:
   --     s: STR_STREAM := #;
   --     write_to_stream(s);
   --     write_to_stream(s);
   --     s.str then would have two copies of "this is a test" in it.

   private attr f: FSTR;
   
   create: SAME is
      -- Create a new stream
      res ::= new;
      res.f := #FSTR("");
      return res;
   end;
   
   plus(s: $STR): SAME is
      -- Append the string "s" to self
      f := f+s.str;
      return self;
   end;

   plus(s: $STR) is discard ::= plus(s) end;
   
   str: STR is     return f.str;  end;

end; -- class STR_STREAM