src/main/java/io/devnulllabs/openjava/syntax/PrepPhraseRule.java


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/*
 * PrepPhraseRule.java
 *
 * comments here.
 *
 * @author   Michiaki Tatsubori
 * @version  %VERSION% %DATE%
 * @see      java.lang.Object
 *
 * COPYRIGHT 1999 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
 */
package io.devnulllabs.openjava.syntax;

import io.devnulllabs.openjava.ptree.ParseTree;

/**
 * The class <code>PrepPhraseRule</code> represents the syntax rule
 * of a prepositional phrase.
 * Suppose there's a syntax rule <code>A</code> and a given identifier
 * <code>i</code>.  This class can represent the syntax:
 * <pre>
 * PrepPhraseRule := i A
 * </pre>
 * <p>
 *
 * @author   Michiaki Tatsubori
 * @version  1.0
 * @since    $Id: PrepPhraseRule.java,v 1.2 2003/02/19 02:54:31 tatsubori Exp $
 * @see java.lang.Object
 */
public class PrepPhraseRule extends AbstractSyntaxRule {

    private String prep;
    private SyntaxRule words;

    /**
     * Allocates a new rule representing the syntax of a prepositional
     * phrase consisting of a preposition and a syntax.
     */
    public PrepPhraseRule(String prep, SyntaxRule words) {
        this.prep = prep;
        this.words = words;
    }

    public ParseTree consume(TokenSource token_src) throws SyntaxException {
        IdentifierRule ident = new IdentifierRule(prep);
        ident.consume(token_src);
        return words.consume(token_src);
    }

}