/*
 * ASPTokenMarker.java 
 * Copyright (c) 1999 André Kaplan
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
  
package org.gjt.sp.jedit.syntax;

import java.util.Enumeration;
import java.util.Stack;
import javax.swing.text.Segment;

import gnu.regexp.*;


/**
 * An utility class to save some relevant infos (language and client/server side)
 * found in SCRIPT Tags or <%@ like Tags
 *
 * @author  Andre Kaplan
 * @version 0.6
 */
class ASPStateInfo
{
	ASPStateInfo() {}

	ASPStateInfo(boolean client, String language)
	{
		this.client   = client;
		this.language = language;
	}

	void init(boolean client, String language)
	{
		this.client   = client;
		this.language = language;
	}

	public boolean equals(Object o)
	{
		if (o == null || !(o instanceof ASPStateInfo))
		{
			return false;
		}

		ASPStateInfo other = (ASPStateInfo)o;

		return ((this.client == other.client) && this.language.equals(other.language));
	}
 
	byte toASPMode()
	{
		for (int i = 0; i < modes.length; i++)
		{
			if (this.equals(modes[i][0]))
			{
				return ((Byte)modes[i][1]).byteValue();
			}
		}

		return ASPMode.HTML;
	}

	void display(java.io.PrintStream o)
	{
		o.println("LANGUAGE: [" + this.language + "]");
		o.println("CLIENT:   [" + this.client   + "]");
	}

	boolean client   = true;
	String  language = "javascript";

	private static Object[][] modes = new Object[][] {
		 new Object[] { new ASPStateInfo(true,  "html"),       new Byte(ASPMode.HTML) }
		,new Object[] { new ASPStateInfo(false, "html"),       new Byte(ASPMode.HTML) }
		,new Object[] { new ASPStateInfo(true,  "javascript"), new Byte(ASPMode.CSJS) }
		,new Object[] { new ASPStateInfo(true,  "jscript"),    new Byte(ASPMode.CSJS) }
		,new Object[] { new ASPStateInfo(false, "javascript"), new Byte(ASPMode.SSJS) }
		,new Object[] { new ASPStateInfo(false, "jscript"),    new Byte(ASPMode.SSJS) }
		,new Object[] { new ASPStateInfo(true,  "vbscript"),   new Byte(ASPMode.CSVB) }
		,new Object[] { new ASPStateInfo(false, "vbscript"),   new Byte(ASPMode.SSVB) }
		,new Object[] { new ASPStateInfo(true,  "perlscript"), new Byte(ASPMode.CSPS) }
		,new Object[] { new ASPStateInfo(false, "perlscript"), new Byte(ASPMode.SSPS) }
	};
}
	
/**
 * ASP Token Marker.
 * TO DO: CSS support, HTML Entities, HTML Attributes & Values colorizing
 *
 * @author Andre Kaplan
 * @version 0.6
 */
public class ASPTokenMarker 
	extends    TokenMarker
	implements TokenMarkerWithAddToken
{
	// Token to request next line parsing when the mode has changed
	public static final byte MODE_CHANGE = Token.INTERNAL_FIRST;

	public ASPTokenMarker()
	{
	}

	public void addToken(int length, byte id)
	{
		super.addToken(length, id);
	}

	// **************
	// markTokensImpl
	// **************
	protected byte markTokensImpl(byte token, Segment line, int lineIndex)
	{
		TokenMarkerContext tokenContext = new TokenMarkerContext(line, lineIndex, this, this.lineInfo);
		
		// We store the old defaultASPMode
		byte defaultASPMode = this.defaultASPMode;

		MultiModeToken prevLineToken = MultiModeToken.NULL;

		if (    tokenContext.prevLineInfo != null 
			 && tokenContext.prevLineInfo.obj != null 
			 && tokenContext.prevLineInfo.obj instanceof MultiModeToken
		)
		{
			prevLineToken = (MultiModeToken)tokenContext.prevLineInfo.obj;
		}

		MultiModeToken currLineToken = MultiModeToken.NULL;
		if (    tokenContext.currLineInfo != null 
			 && tokenContext.currLineInfo.obj != null 
			 && tokenContext.currLineInfo.obj instanceof MultiModeToken
		)
		{
			currLineToken = (MultiModeToken)tokenContext.currLineInfo.obj;
		}

		MultiModeToken res = this.markTokensImpl(prevLineToken, tokenContext);

		byte retval = res.token;

		// We check if mode has changed
		if (
				(defaultASPMode != this.defaultASPMode || currLineToken.mode != res.mode)
			 && (currLineToken.token == res.token)
		)
		{
			// We inform markTokens that the mode has changed
			retval = MODE_CHANGE;
		}

		tokenContext.currLineInfo.obj = res;

		return retval;
	}

	// **************
	// markTokensImpl
	// **************
	MultiModeToken markTokensImpl(final MultiModeToken token, TokenMarkerContext tokenContext)
	{
		MultiModeToken res = new MultiModeToken(token);

loop:   for (this.debug.reset(); tokenContext.hasMoreChars(); )
		{
			char c = tokenContext.getChar();

			if (!this.debug.isOK(tokenContext)) {
				// We got stuck here at some point
				// Log this and increment tokenContext.pos to escape this
				tokenContext.pos++;
			}

			// Switch to ASP Mode if <% found at pos
			// Except if already in a server-side mode
			if (	(res.mode != ASPMode.HTML_SCRIPT)
				 &&	(res.mode != ASPMode.SSI)
				 &&	(res.mode != ASPMode.ASP)
				 &&	(res.mode != ASPMode.ASP_CFG)
				 &&	(res.mode != ASPMode.SSVB)
				 &&	(res.mode != ASPMode.SSJS)
				 &&	(res.mode != ASPMode.SSPS)
			   )
			{
				if (this.doASP(res, tokenContext)) { 
					continue; }
			}

			// Switch to HTML_SCRIPT Mode if