From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,ed5c783a710fcda5,start
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 1995-02-28 05:24:26 PST
Path: 
 nntp.gmd.de!stern.fokus.gmd.de!ceres.fokus.gmd.de!zib-berlin.de!fauern!news.th-darmstadt.de!terra.wiwi.uni-frankfurt.de!zeus.rbi.informatik.uni-frankfurt.de!news.dfn.de!fu-berlin.de!zrz.TU-Berlin.DE!netmbx.de!unlisys!news.maz.net!pipex!howland.reston.ans.net!newsserver.jvnc.net!monmouth.edu!moncol!s0222353
From: s0222353@moncol.monmouth.edu (DEAN RUNZEL)
Newsgroups: comp.lang.ada
Subject: AFLEX help needed
Date: 28 Feb 1995 13:24:26 GMT
Organization: Monmouth College, W. Long Branch, NJ  07764
Message-ID: <3iv86a$9lr@monmouth.edu>
NNTP-Posting-Host: moncol.monmouth.edu
X-Newsreader: TIN [version 1.2 PL2]
Date: 1995-02-28T13:24:26+00:00
List-Id: <comp.lang.ada>

Is there someone out there who is familiar with Aflex and Ayacc and who could
tell me how to get in touch with the maintainers of these programs? We are
using them to develop an Ada95 parser as part of our master's thesis project
and I have run into a real problem with Aflex. 

The problem is:

We use [a-zA-Z](_?[a-zA-Z0-9])* as the BNF for Ada identifiers. This should
prevent identifiers with leading underscores or with consecutive underscores.
When we run this through Aflex and build a simple tool to print the tokens
and their values to a file, the lexical analyzer calls items with both
leading underscores and consecutive underscores identifiers and allows them
as valid tokens. Why? 

I'd be willing to send the code to anyone who can help. I could probably
fix this by putting in a validity checking routine to scan each identifier
for leading or consecutive underscores but, given the above BNF, this should
be unnecessary and is definitely undesireable.

Any help would be greatly appreciated. Thanks in advance for any info.

Dean R. Runzel