//  Job: Jay's Own Browser, a web browser written in Java by Jay Skeer
//  Copyright (C) 1996 Jay Skeer, Jay Prime Positive
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//

/** 
Subclass of HtmlTokenStream which produces a stream of HtmlComponents
*/
import Jdb;
import java.io.*;
import HtmlToken;
import HtmlTokenStream;
import HtmlComponent;

public class HtmlComponentStream extends HtmlTokenStream {

    /** Given a filename, construct a HtmlComponentStream */
    public HtmlComponentStream(File file) throws IOException {
	super(file);
    }

    /** Given a filename, construct a HtmlComponentStream */
    public HtmlComponentStream(String file) throws IOException {
	super(new File(file));
    }

    public void close() throws IOException {
	super.close();
    }

    public boolean eof() {
	return super.eof();
    }

    /** Internal, given a token, return some kind of HtmlComponent */
    private HtmlComponent tokenToComp(HtmlToken t) {
	HtmlComponent rv= null;
	if (HtmlToken.TEXT == t.id) {
	    rv= new HtmlComponent(HtmlComponent.TEXT, t.value);
	    rv.value= null;
	} else if (HtmlToken.HTML == t.id) {
	    rv= new HtmlComponent(HtmlComponent.HTML);
	    rv.value= "begin";
	} else if (HtmlToken.HEAD == t.id) {
	    rv= new HtmlComponent(HtmlComponent.HEAD);
	    rv.value= "begin";
	} else if (HtmlToken.TITLE == t.id) {
	    rv= new HtmlComponent(HtmlComponent.TITLE);
	    rv.value= "begin";
	} else if (HtmlToken.BODY == t.id) {
	    rv= new HtmlComponent(HtmlComponent.BODY);
	    rv.value= "begin";
	} else if (HtmlToken.H1 == t.id) {
	    rv= new HtmlComponent(HtmlComponent.H1);
	    rv.value= "begin";
	} else if (HtmlToken.H2 == t.id) {
	    rv= new HtmlComponent(HtmlComponent.H2);
	    rv.value= "begin";
	} else if (HtmlToken.H3 == t.id) {
	    rv= new HtmlComponent(HtmlComponent.H3);
	    rv.value= "begin";
	} else if (HtmlToken.H4 == t.id) {
	    rv= new HtmlComponent(HtmlComponent.H4);
	    rv.value= "begin";
	} else if (HtmlToken.H5 == t.id) {
	    rv= new HtmlComponent(HtmlComponent.H5);
	    rv.value= "begin";
	} else if (HtmlToken.PRE == t.id) {
	    rv= new HtmlComponent(HtmlComponent.PRE);
	    rv.value= "begin";
	} else if (HtmlToken.TT == t.id) {
	    rv= new HtmlComponent(HtmlComponent.TT);
	    rv.value= "begin";
	} else if (HtmlToken.STRONG == t.id) {
	    rv= new HtmlComponent(HtmlComponent.STRONG);
	    rv.value= "begin";
	} else if (HtmlToken.B == t.id) {
	    rv= new HtmlComponent(HtmlComponent.B);
	    rv.value= "begin";
	} else if (HtmlToken.CENTER == t.id) {
	    rv= new HtmlComponent(HtmlComponent.CENTER);
	    rv.value= "begin";
	} else if (HtmlToken.HR == t.id) {
	    rv= new HtmlComponent(HtmlComponent.HR);
	    rv.value= null;
	} else if (HtmlToken.P == t.id) {
	    rv= new HtmlComponent(HtmlComponent.P, t.value);
	    rv.value= null;
	} else if (HtmlToken.ANCHOR == t.id) {
	    rv= new HtmlComponent(HtmlComponent.ANCHOR, t.value);
	    rv.value= "begin";
	} else if (HtmlToken.AHREF == t.id) {
	    rv= new HtmlComponent(HtmlComponent.AHREF, t.value);
	    rv.value= "begin";
	} else if (HtmlToken.ANAME == t.id) {
	    rv= new HtmlComponent(HtmlComponent.ANAME, t.value);
	    rv.value= "begin";
	} else if (HtmlToken.LIST == t.id) {
	    rv= new HtmlComponent(HtmlComponent.LIST, t.value);
	    rv.value= "begin";
	} else if (HtmlToken.DL == t.id) {
	    rv= new HtmlComponent(HtmlComponent.DL, t.value);
	    rv.value= "begin";
	} else if (HtmlToken.UL == t.id) {
	    rv= new HtmlComponent(HtmlComponent.UL, t.value);
	    rv.value= "begin";
	} else if (HtmlToken.LI == t.id) {
	    rv= new HtmlComponent(HtmlComponent.LI, t.value);
	    rv.value= null;
	} else if (HtmlToken.DD == t.id) {
	    rv= new HtmlComponent(HtmlComponent.DD);
	    rv.value= null;
	} else if (HtmlToken.DT == t.id) {
	    rv= new HtmlComponent(HtmlComponent.DT);
	    rv.value= null;
	} else if (HtmlToken.IMG == t.id) {
	    rv= new HtmlComponent(HtmlComponent.IMG, t.value);
	    rv.value= null;
	} else {
	    rv= new HtmlComponent(HtmlComponent.OTHER, t.value);
	    rv.value= "begin";
	}
Jdb.trace("new HCS(String) => "+rv);
	return rv;
    }

    /** parses the current </...> document. */
    public HtmlComponent readHtmlAngleEnd() {
        //Jdb.enter("HCS.readHtmlAngleEnd()");
	HtmlComponent rv= null;
        HtmlToken u;
	u= readToken();
	if ((HtmlToken.CLOSE != u.id)
	&&  (HtmlToken.EOF   != u.id))
	{
	    rv= tokenToComp(u);
	    rv= readHtmlAngleOnly(rv);
	    rv.value= "end";
	} else {
	    /* error */
	    rv= new HtmlComponent(HtmlComponent.OTHER, "error");
	    if (HtmlToken.EOF == u.id) unreadToken(u);
	}
	//Jdb.exit("HCS.readHtmlAngleEnd()");
	return rv;
    }

    /** parses the current <foo aaa> document. */
    public HtmlComponent readHtmlAngleOnly(HtmlComponent rv) {
	//Jdb.enter("HCS.readHtmlAngleOnly()");
	rv= readHtmlAngleArgList(rv);
	//Jdb.exit("HCS.readHtmlAngleOnly()");
	return rv;
    }

    /** parses a aaa=bbb pair ...> */
    public HtmlComponent readHtmlArg(String tag) {
	//Jdb.enter("HCS.readHtmlAngleArg()");
	HtmlComponent rv= new HtmlComponent(HtmlComponent.ARG);
        HtmlToken name, eq, value;
	name= readToken();
	if (HtmlToken.ID == name.id) {
	    eq= readToken();
	    if (HtmlToken.EQUAL == eq.id) {
		value= readArgValueToken(tag, name.value);
	        if (HtmlToken.EOF == value.id) {
		    unreadToken(value);
//		    value= new HtmlToken(HtmlToken.STRING);
//		    value.value= new String();
		}
		rv.name= name.value;
		rv.value= value.value;
	    } else if (HtmlToken.EOF == eq.id) {
		unreadToken(eq);
	    }
	} else if (HtmlToken.EOF == name.id) {
	    unreadToken(name);
	}
	//Jdb.exit("HCS.readHtmlAngleArg()");
	return rv;
    }

    /** parses the argument list in <foo aaa=bbb ccc ...> */
    public HtmlComponent readHtmlAngleArgList(HtmlComponent rv) {
	//Jdb.enter("HCS.readHtmlAngleArgList()");
	HtmlComponent av;
        HtmlToken t;
	t= readToken();
	while ((HtmlToken.CLOSE != t.id)
	   &&  (HtmlToken.EOF   != t.id))
        {
	    unreadToken(t);
	    av= readHtmlArg(rv.id_string);
	    rv.addArg(av);
	    t= readToken();
	}
	if (HtmlToken.EOF == t.id) unreadToken(t);
	//Jdb.exit("HCS.readHtmlAngleArgList()");
	return rv;
    }

    /** parses the current <foo aaa>bbb</foo> document. */
    public HtmlComponent readHtmlAngleBegin(HtmlComponent rv) {
	//Jdb.enter("HCS.readHtmlAngleBegin()");
        HtmlToken t;
	t= readToken();
	if ((HtmlToken.CLOSE != t.id)
	&&  (HtmlToken.EOF   != t.id))
        {
	    unreadToken(t);
	    rv= readHtmlAngleArgList(rv);
	}
	t= readToken();
	HtmlComponent kv;
	boolean working= true;
	while ((HtmlToken.EOF != t.id)
	   &&  working)
	{
	    unreadToken(t);
	    kv= readHtmlComponent();
	    if ((kv.id == rv.id)
	    &&  (null != kv.value)
	    &&  (kv.value.equalsIgnoreCase("end")))
	    {
		working= false;
	    } else {
	        //Jdb.trace("adding a kid == " + kv.toString());
		rv.add(kv);
	        //Jdb.trace("rv now is == " + rv.toString());
	    }
	    t= readToken();
	}
	rv.value= null;
	unreadToken(t);
	//Jdb.exit("HCS.readHtmlAngleBegin()");
	//Jdb.exit("HCS.readHtmlAngleBegin() => " + rv.toString());
	return rv;
    }

    /** parses a file into an html <...> document. */
    public HtmlComponent readHtmlAngle() {
	//Jdb.enter("HCS.readHtmlAngle()");
	HtmlToken t;
	HtmlComponent rv= null;
	t= readToken();
	if (HtmlToken.END == t.id) {
	    rv= readHtmlAngleEnd();
	} else if ((HtmlToken.CLOSE != t.id)
	       &&  (HtmlToken.EOF   != t.id))
	{
	    rv= tokenToComp(t);
	    //Jdb.trace("building a " + rv.toString());
	    if ((null != rv.value)
	    &&  (rv.value.equalsIgnoreCase("begin")))
	    {
		rv= readHtmlAngleBegin(rv);
	    } else { /* assume an "only" */
		rv= readHtmlAngleOnly(rv);
	    }
	}
	if (HtmlToken.EOF == t.id) unreadToken(t);
	//Jdb.exit("HCS.readHtmlAngle()");
	//Jdb.exit("HCS.readHtmlAngle() => " + rv.toString());
	return rv;
    }

    /** returns the next HtmlComponent from the stream. */
    public HtmlComponent readHtmlComponent() {
	//Jdb.enter("HCS.readHtmlComponent()");
	HtmlToken t;
	HtmlComponent rv= null;
	t= this.readToken();
	if (HtmlToken.OPEN == t.id) {
	    rv= readHtmlAngle();
	} else {
	    rv= tokenToComp(t);
	}
	//Jdb.exit("HCS.readHtmlComponent()");
	//Jdb.exit("HCS.readHtmlComponent() => " + rv.toString());
	return rv;
    }

}