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 * Copyright (C) jparsec.org                                                *
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 * Licensed under the Apache License, Version 2.0 (the "License");           *
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 * You may obtain a copy of the License at                                   *
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 * http://www.apache.org/licenses/LICENSE-2.0                                *
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package org.jparsec.examples.bnf.ast;

import org.jparsec.examples.common.Strings;
import org.jparsec.examples.common.ValueObject;

import java.util.Collections;
import java.util.List;

/**
 * Represents a rule with a bunch of alternatives.
 * 
 * @author benyu
 */
public final class AltRule extends ValueObject implements Rule {
  public final List alternatives;
  
  public AltRule(List alternatives) {
    this.alternatives = Collections.unmodifiableList(alternatives);
  }
  
  @Override public String toString() {
    return "(" + Strings.join(" | ", alternatives) + ")";
  }
}