import java.io.*;



/*

 * @name TagGetter

 * @purpose gets from a reader a tag ("<...>") or an inter-tag text

 * 

 * 

 */

class TagGetter{

    int lastChar;

    Reader r;



    public TagGetter(Reader r) throws IOException{

        this.r = r;

        lastChar = this.r.read();

    }



    public String next() throws IOException{

        switch(lastChar){

            case '<':    return nextTag(lastChar);      // start of "<...>"

            case -1 :    return null;                   // End Of File

            default :    return nextText(lastChar);     // regular text

        }

    }



    // ------------- protected methods below ------------------ //



    String nextTag(int c) throws IOException{

        if( c!='<' ) throw new IOException("Illegal argument to getTag():"+c);

        StringBuffer s = new StringBuffer();

        s.append((char)c);



        while( (c=r.read()) != -1 ){

            s.append((char)c);

            if(c=='>') {

                lastChar = r.read();

                return s.toString();

            }

        }

        return null;

    }





    String nextText(int c) throws IOException{



        StringBuffer s = new StringBuffer();

        s.append((char)c);



        while( (c=r.read()) != -1 ){

            if(c=='<') {

                lastChar = c;

                return s.toString();

            }

            s.append((char)c);

        }

        return null;

    }





/*

    public static void main(String[] args)

        throws FileNotFoundException, IOException

    {

        if( args.length < 1 ){

            System.out.println("Usage: java TagGetter filename.html");

            return;

        }



        System.out.println("Loading file "+args[0]);



        FileReader r = new FileReader(args[0]);

        TagGetter  t = new TagGetter(r);

        String s;

        

        while( (s = t.next()) != null ){

            System.out.println("Next tag:--------------");

            System.out.println(s);

        }

        System.out.println("End of file --------------");

    }

*/

}