org.unlaxer.tinyexpression.parser.BooleanClauseParser Maven / Gradle / Ivy

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package org.unlaxer.tinyexpression.parser;

import java.util.List;

import org.unlaxer.parser.Parser;
import org.unlaxer.parser.Parsers;
import org.unlaxer.parser.combinator.Choice;
import org.unlaxer.parser.combinator.WhiteSpaceDelimitedChain;
import org.unlaxer.parser.combinator.WhiteSpaceDelimitedLazyChain;
import org.unlaxer.parser.combinator.ZeroOrMore;
import org.unlaxer.parser.elementary.WordParser;

public class BooleanClauseParser extends WhiteSpaceDelimitedLazyChain{

	private static final long serialVersionUID = 1362501275934237988L;

	public BooleanClauseParser() {
		super();
	}

	List parsers;

	@Override
	public void initialize() {
		//  ::= [('=='|'!='|'&'|'|'|'^')]*
		
		parsers =
			new Parsers(
				Parser.get(BooleanExpressionParser.class),
				new ZeroOrMore(
					new WhiteSpaceDelimitedChain(
						new Choice(
							Parser.get(()->new WordParser("==")),
							Parser.get(()->new WordParser("!=")),
							Parser.get(()->new WordParser("&")),
							Parser.get(()->new WordParser("|")),
							Parser.get(()->new WordParser("^"))
						),
						Parser.get(BooleanExpressionParser.class)
					)
				)
			);
	}

	@Override
	public List getLazyParsers() {
		return parsers;
	}
	
}