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

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package org.unlaxer.tinyexpression.parser;

import java.util.List;
import java.util.stream.Collectors;

import org.unlaxer.Name;
import org.unlaxer.Token;
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.posix.CommaParser;

public class SideEffectExpressionParameterParser extends WhiteSpaceDelimitedLazyChain {

	private static final long serialVersionUID = -1540940685498628668L;

	public SideEffectExpressionParameterParser() {
		super();
	}

	public SideEffectExpressionParameterParser(Name name) {
		super(name);
	}
	
	List parsers;
	
	@Override
	public void initialize() {
		parsers = 
			new Parsers(
				Parser.get(ExpressionParser.class),
				new ZeroOrMore(
					new WhiteSpaceDelimitedChain(
						Parser.get(CommaParser.class),
						new Choice(
					    Parser.get(BooleanClauseParser.class),
					    Parser.get(StringExpressionParser.class),
							Parser.get(ExpressionParser.class)
						)
					)	
				)
			);
	}

	@Override
	public List getLazyParsers() {
		return parsers; 
	}
	
	public List parameterTokens(Token sideEffectExpressionParameterParserToken){
		
		if(false == sideEffectExpressionParameterParserToken.parser instanceof SideEffectExpressionParameterParser) {
			throw new IllegalArgumentException("token is invalid");
		}
		
		return sideEffectExpressionParameterParserToken.filteredChildren.stream()
			.filter(token->{
				Parser parser = token.parser;
				return parser instanceof Expression ||
						parser instanceof BooleanExpression ||
						parser instanceof StringExpression;
			}).collect(Collectors.toList());
			
	}
}