Re: how to push token back for Bison to consider it?

jyrixx@astro.temple.edu (Andrew Gwozdziewycz)
6 May 2003 19:15:46 -0400

          From comp.compilers
Related articles
how to push token back for Bison to consider it? mdurovic@vcisnet.net (Milan Durovic) (2003-04-13)
Re: how to push token back for Bison to consider it? jyrixx@astro.temple.edu (2003-05-06)
Re: how to push token back for Bison to consider it? blackmarlin@asean-mail.com (2003-05-15)
| List of all articles for this month |
From: jyrixx@astro.temple.edu (Andrew Gwozdziewycz)
Newsgroups: comp.compilers
Date: 6 May 2003 19:15:46 -0400
Organization: http://groups.google.com/
References: 03-04-038
Keywords: lex
Posted-Date: 06 May 2003 19:15:46 EDT

> ruleBlah: nonterm1 nonterm2
> {
> while( yylex() != SOME_PARTICULAR_TOKEN )
> { do_something(); }
> }
>
> ruleBlah2: SOME_PARTICULAR_TOKEN nonterm3 nonterm4
>
> The problem is that the code above "swallows" SOME_PARTICULAR_TOKEN
> token, and the generated parser never sees it. This causes the parser
> never to match "ruleBlah2" that requires that token.


Using flex you can use the "/" in the pattern rule


So 0/1 will match 01 but push back 1. not sure if that's what your
looking for exactly
[Probably not. -John]


Post a followup to this message

Return to the comp.compilers page.
Search the comp.compilers archives again.