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/*
 * HTMLTokenMarker.java - HTML token marker
 * Copyright (C) 1998, 1999 Slava Pestov
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */

package org.syntax.jedit.tokenmarker;

import org.syntax.jedit.*;
import javax.swing.text.Segment;

/**
 * HTML token marker.
 *
 * @author Slava Pestov
 * @version $Id: HTMLTokenMarker.java,v 1.34 1999/12/13 03:40:29 sp Exp $
 */
public class HTMLTokenMarker extends TokenMarker
{
	public static final byte JAVASCRIPT = Token.INTERNAL_FIRST;

	public HTMLTokenMarker()
	{
		this(true);
	}

	public HTMLTokenMarker(boolean js)
	{
		this.js = js;
		keywords = JavaScriptTokenMarker.getKeywords();
	}

	public byte markTokensImpl(byte token, Segment line, int lineIndex)
	{
		char[] array = line.array;
		int offset = line.offset;
		lastOffset = offset;
		lastKeyword = offset;
		int length = line.count + offset;
		boolean backslash = false;

loop:		for(int i = offset; i < length; i++)
		{
			int i1 = (i+1);

			char c = array[i];
			if(c == '\\')
			{
				backslash = !backslash;
				continue;
			}

			switch(token)
			{
			case Token.NULL: // HTML text
				backslash = false;
				switch(c)
				{
				case '<':
					addToken(i - lastOffset,token);
					lastOffset = lastKeyword = i;
					if(SyntaxUtilities.regionMatches(false,
						line,i1,"!--"))
					{
						i += 3;
						token = Token.COMMENT1;
					}
					else if(js && SyntaxUtilities.regionMatches(
						true,line,i1,"script>"))
					{
						addToken(8,Token.KEYWORD1);
						lastOffset = lastKeyword = (i += 8);
						token = JAVASCRIPT;
					}
					else
					{
						token = Token.KEYWORD1;
					}
					break;
				case '&':
					addToken(i - lastOffset,token);
					lastOffset = lastKeyword = i;
					token = Token.KEYWORD2;
					break;
				}
				break;
			case Token.KEYWORD1: // Inside a tag
				backslash = false;
				if(c == '>')
				{
					addToken(i1 - lastOffset,token);
					lastOffset = lastKeyword = i1;
					token = Token.NULL;
				}
				break;
			case Token.KEYWORD2: // Inside an entity
				backslash = false;
				if(c == ';')
				{
					addToken(i1 - lastOffset,token);
					lastOffset = lastKeyword = i1;
					token = Token.NULL;
					break;
				}
				break;
			case Token.COMMENT1: // Inside a comment
				backslash = false;
				if(SyntaxUtilities.regionMatches(false,line,i,"-->"))
				{
					addToken((i + 3) - lastOffset,token);
					lastOffset = lastKeyword = i + 3;
					token = Token.NULL;
				}
				break;
			case JAVASCRIPT: // Inside a JavaScript
				switch(c)
				{
				case '<':
					backslash = false;
					doKeyword(line,i,c);
					if(SyntaxUtilities.regionMatches(true,
						line,i1,"/script>"))
					{
						addToken(i - lastOffset,
							Token.NULL);
						addToken(9,Token.KEYWORD1);
						lastOffset = lastKeyword = (i += 9);
						token = Token.NULL;
					}
					break;
				case '"':
					if(backslash)
						backslash = false;
					else
					{
						doKeyword(line,i,c);
						addToken(i - lastOffset,Token.NULL);
						lastOffset = lastKeyword = i;
						token = Token.LITERAL1;
					}
					break;
				case '\'':
					if(backslash)
						backslash = false;
					else
					{
						doKeyword(line,i,c);
						addToken(i - lastOffset,Token.NULL);
						lastOffset = lastKeyword = i;
						token = Token.LITERAL2;
					}
					break;
				case '/':
					backslash = false;
					doKeyword(line,i,c);
					if(length - i > 1)
					{
						addToken(i - lastOffset,Token.NULL);
						lastOffset = lastKeyword = i;
						if(array[i1] == '/')
						{
							addToken(length - i,Token.COMMENT2);
							lastOffset = lastKeyword = length;
							break loop;
						}
						else if(array[i1] == '*')
						{
							token = Token.COMMENT2;
						}
					}
					break;
				default:					backslash = false;
					if(!Character.isLetterOrDigit(c)
						&& c != '_')
						doKeyword(line,i,c);
					break;
				}
				break;
			case Token.LITERAL1: // JavaScript "..."
				if(backslash)
					backslash = false;
				else if(c == '"')
				{
					addToken(i1 - lastOffset,Token.LITERAL1);
					lastOffset = lastKeyword = i1;
					token = JAVASCRIPT;
				}
				break;
			case Token.LITERAL2: // JavaScript '...'
				if(backslash)
					backslash = false;
				else if(c == '\'')
				{
					addToken(i1 - lastOffset,Token.LITERAL1);
					lastOffset = lastKeyword = i1;
					token = JAVASCRIPT;
				}
				break;
			case Token.COMMENT2: // Inside a JavaScript comment
				backslash = false;
				if(c == '*' && length - i > 1 && array[i1] == '/')
				{
					addToken((i+=2) - lastOffset,Token.COMMENT2);
					lastOffset = lastKeyword = i;
					token = JAVASCRIPT;
				}
				break;
			default:
				throw new InternalError("Invalid state: "
					+ token);
			}
		}

		switch(token)
		{
		case Token.LITERAL1:
		case Token.LITERAL2:
			addToken(length - lastOffset,Token.INVALID);
			token = JAVASCRIPT;
			break;
		case Token.KEYWORD2:
			addToken(length - lastOffset,Token.INVALID);
			token = Token.NULL;
			break;
		case JAVASCRIPT:
			doKeyword(line,length,'\0');
			addToken(length - lastOffset,Token.NULL);
			break;
		default:
			addToken(length - lastOffset,token);
			break;
		}

		return token;
	}

	// private members
	private KeywordMap keywords;
	private boolean js;
	private int lastOffset;
	private int lastKeyword;

	private boolean doKeyword(Segment line, int i, char c)
	{
		int i1 = i+1;

		int len = i - lastKeyword;
		byte id = keywords.lookup(line,lastKeyword,len);
		if(id != Token.NULL)
		{
			if(lastKeyword != lastOffset)
				addToken(lastKeyword - lastOffset,Token.NULL);
			addToken(len,id);
			lastOffset = i;
		}
		lastKeyword = i1;
		return false;
	}
}