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

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package org.unlaxer.tinyexpression.parser;

import java.util.List;

import org.unlaxer.Name;
import org.unlaxer.parser.Parser;
import org.unlaxer.parser.Parsers;
import org.unlaxer.parser.combinator.LazyChoice;
import org.unlaxer.parser.elementary.ParenthesesParser;

public class BooleanExpressionParser extends LazyChoice{

	private static final long serialVersionUID = -3195226739862127225L;
	
	public BooleanExpressionParser() {
		super();
	}
	
	List parsers;

	@Override
	public void initialize() {
		// BooleanExpression ::= 
		//		| 'true'
		//		| 'false'
		//		| 'not(' BooleanClause ')'
		//		| '(' BooleanClause ')'
		//		| Expression '==' Expression 
		//		| Expression '!=' Expression 
		//		| Expression '>=' Expression 
		//		| Expression '<=' Expression 
		//		| Expression '>' Expression 
		//		| Expression '<' Expression 
		//		| BooleanExpressionOfString
		//		| Variable
		parsers =
			new Parsers(
				Parser.get(TrueTokenParser.class),
				Parser.get(FalseTokenParser.class),
				Parser.get(NotBooleanExpressionParser.class),
				new ParenthesesParser(Parser.get(BooleanClauseParser.class)),
				Parser.get(IsPresentParser.class),
				Parser.get(EqualEqualExpressionParser.class),
				Parser.get(NotEqualExpressionParser.class),
				Parser.get(GreaterOrEqualExpressionParser.class),
				Parser.get(LessOrEqualExpressionParser.class),
				Parser.get(GreaterExpressionParser.class),
				Parser.get(LessExpressionParser.class),
				Parser.get(BooleanExpressionOfStringParser.class),
				Parser.get(()->new VariableParser(Name.of("booleanVariable")))
			);
	}

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