📄 digest.jj
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/* * Copyright © 2002 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * California 95054, U.S.A. All rights reserved. Sun Microsystems, Inc. has * intellectual property rights relating to technology embodied in the product * that is described in this document. In particular, and without limitation, * these intellectual property rights may include one or more of the U.S. * patents listed at http://www.sun.com/patents and one or more additional * patents or pending patent applications in the U.S. and in other countries. * U.S. Government Rights - Commercial software. Government users are subject * to the Sun Microsystems, Inc. standard license agreement and applicable * provisions of the FAR and its supplements. Use is subject to license terms. * Sun, Sun Microsystems, the Sun logo and Java are trademarks or registered * trademarks of Sun Microsystems, Inc. in the U.S. and other countries. This * product is covered and controlled by U.S. Export Control laws and may be * subject to the export or import laws in other countries. Nuclear, missile, * chemical biological weapons or nuclear maritime end uses or end users, * whether direct or indirect, are strictly prohibited. Export or reexport * to countries subject to U.S. embargo or to entities identified on U.S. * export exclusion lists, including, but not limited to, the denied persons * and specially designated nationals lists is strictly prohibited. */PARSER_BEGIN(Digest)import java.io.*;public class Digest { static int count = 0; static String buffer = ""; public static void main(String args[]) throws ParseException { Digest parser = new Digest(System.in); System.out.println("DIGEST OF RECENT MESSAGES FROM THE JAVACC MAILING LIST"); System.out.println("----------------------------------------------------------------------"); System.out.println(""); System.out.println("MESSAGE SUMMARY:"); System.out.println(""); parser.MailFile(); if (count == 0) { System.out.println("There have been no messages since the last digest posting."); System.out.println(""); System.out.println("----------------------------------------------------------------------"); } else { System.out.println(""); System.out.println("----------------------------------------------------------------------"); System.out.println(""); System.out.println(buffer); } }}PARSER_END(Digest)// PARSER SPECIFICATIONS BEGIN HEREvoid MailFile() : { }{ ( { count++; } MailMessage() )* <EOF>}void MailMessage() : { Token subj=null, from=null, date=null, body; }{ ( subj=<SUBJECT> | from=<FROM> | date=<DATE> )+ { System.out.println(count + ". " + ((subj==null) ? "no subject" : subj.image)); buffer += "\n"; buffer += "Message " + count + ":\n"; buffer += "\n"; buffer += "Subject: " + ((subj==null) ? "no subject" : subj.image) + "\n"; buffer += "From: " + ((from==null) ? "" : from.image) + "\n"; buffer += "Date: " + ((date==null) ? "" : date.image) + "\n"; buffer += "\n"; } ( body=<BODY> { buffer += body.image; } )* <END> { buffer += "\n"; buffer += "----------------------------------------------------------------------\n"; }}// LEXICAL SPECIFICATIONS BEGIN HERETOKEN:{ <#EOL: "\n" | "\r" | "\r\n">| <#TWOEOLS: (("\n"|"\r\n") <EOL>) | ("\r\r" [ "\n" ])>| <#NOT_EOL: ~["\n","\r"]>}<DEFAULT>SKIP:{ <<EOL> "*** EOOH ***" <EOL>> : MAILHEADER| <~[]>}<MAILHEADER>SKIP:{ <_TWOEOLS: <TWOEOLS>> : MAILBODY // We cannot have just a reference to a regular expression in a // lexical specification - i.e., we cannot simply have <TWOEOLS>.| "Subject: " : MAILSUBJECT| "From: " : MAILFROM| "Date: " : MAILDATE| <~[]>}<MAILSUBJECT>TOKEN:{ <SUBJECT: ( <NOT_EOL> )+>}<MAILSUBJECT>SKIP:{ <_EOL1: <EOL>> : MAILHEADER}<MAILFROM>TOKEN:{ <FROM: ( <NOT_EOL> )+>}<MAILFROM>SKIP:{ <_EOL2: <EOL>> : MAILHEADER}<MAILDATE>TOKEN:{ <DATE: ( <NOT_EOL> )+>}<MAILDATE>SKIP:{ <_EOL3: <EOL>> : MAILHEADER}<MAILBODY>TOKEN:{ <BODY: (~["\n","\r","\u001f"])* <EOL>>| <END: "\u001f"> : DEFAULT}⌨️ 快捷键说明
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