/**
 * Copyright winterwell Mathematics Ltd.
 * @author Daniel Winterstein
 * 11 Jan 2007
 */
package winterwell.markdown.editors;

import java.util.ArrayList;
import java.util.List;
import java.util.Arrays;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;

/**
 * 
 *
 * @author Daniel Winterstein
 */
public class ListRule implements IRule {
	private ArrayList<Integer> markerList;
	protected IToken fToken;
		
	public ListRule(IToken token) {	
		Assert.isNotNull(token);
		fToken= token;
	}
	

	/*
	 * @see IRule#evaluate(ICharacterScanner)
	 * @since 2.0
	 */
	public IToken evaluate(ICharacterScanner scanner) {
		if (scanner.getColumn() != 0) {
			return Token.UNDEFINED;
		}
//		// Fast mode
//		if (scanner.read() != '-') {
//			scanner.unread();
//			return Token.UNDEFINED;
//		}
//		if (Character.isWhitespace(scanner.read())) {
//			return fToken;
//		}
//		scanner.unread();
//		scanner.unread();
//		return Token.UNDEFINED;
//		// Fast mode
		int readCount = 0;
		int c;
		while ((c = scanner.read()) != ICharacterScanner.EOF) {
			readCount++;
			if( !Character.isWhitespace( c ) ) {
				int after = scanner.read();
//				readCount++;
				scanner.unread();
//				if ( markerList.contains(c) && Character.isWhitespace( after ) ) {
				if ( (c == '-' || c == '+' || c == '*') 
						&& Character.isWhitespace( after ) ) {
					return fToken;
				} else {
					for (; readCount > 0; readCount--)
						scanner.unread();
					return Token.UNDEFINED;
				}
			}
		}
		// Reached ICharacterScanner.EOF
		for (; readCount > 0; readCount--)
			scanner.unread();
		return Token.UNDEFINED;
	}
}