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

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package org.unlaxer.tinyexpression.parser;

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.ZeroOrMore;
import org.unlaxer.parser.elementary.WordParser;
import org.unlaxer.tinyexpression.parser.javalang.JavaStyleDelimitedLazyChain;

public abstract class AbstractBooleanExpressionParser extends JavaStyleDelimitedLazyChain
    implements BooleanExpression, VariableTypeSelectable {

  public AbstractBooleanExpressionParser() {
    super();
  }

  @Override
  public org.unlaxer.parser.Parsers getLazyParsers(boolean withNakedVariable) {

    Class booleanExpressionParserClazz = withNakedVariable ? BooleanFactorParser.class
        : StrictTypedBooleanFactorParser.class;

    //  ::=
    // [('=='|'!='|'&'|'|'|'^')]*
    return new Parsers(
        Parser.get(booleanExpressionParserClazz),
        new ZeroOrMore(
            new WhiteSpaceDelimitedChain(
                new Choice(
                    Parser.get(() -> new EqualEqualParser()),
                    Parser.get(() -> new NotEqualParser()),
                    Parser.get(() -> new AndParser()),
                    Parser.get(() -> new OrParser()),
                    Parser.get(() -> new XorParser())//
                ), //
                Parser.get(booleanExpressionParserClazz)//
            )//
        )//
    );
  }

}