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From: Ted Dennison <dennison@telepath.com>
Newsgroups: comp.lang.ada
Subject: Re: very specific question on Ada syntax
Date: Tue, 30 Jan 2001 19:16:11 GMT
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In article <956vav$e7q$1@nnrp1.deja.com>,
  Robert Dewar <robert_dewar@my-deja.com> wrote:
> will have trouble. Note that if you are using a tool like
> flex, there is absolutely no problem in dealing with this.

To the best of my knowledge, flex has no "last token" function in its
API. It can do *character* context, but not token context. Thus to
properly handle this situation with lex, you'd have to hack it in
manually with inserted C code (most likely by passing info back from the
parser).

I just checked the Ada95 lex spec available from the AdaIC site
(http://www.adaic.org/standards/95lrm_rat/lexer9x.l
). It indeed contains no context information in the token definitions,
and thus should have the same problem. The relevent entries are:
-------------------------------------------
"'"                     return(TIC);
"'"."'"                 return(char_lit);
-------------------------------------------


--
T.E.D.

http://www.telepath.com/~dennison/Ted/TED.html


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