unput() messes up yy_at_bol
To: Xinying Li <email@example.com>
Subject: Re: FLEX ?
In-reply-to: Your message of Wed, 13 Nov 1996 17:28:38 PST.
Date: Wed, 13 Nov 1996 19:51:54 PST
From: Vern Paxson <vern>
> "unput()" them to input flow, question occurs. If I do this after I scan
> a carriage, the variable "YY_CURRENT_BUFFER->yy_at_bol" is changed. That
> means the carriage flag has gone.
You can control this by calling yy_set_bol(). It's described in the manual.
> And if in pre-reading it goes to the end of file, is anything done
> to control the end of curren buffer and end of file?
No, there's no way to put back an end-of-file.
> By the way I am using flex 2.5.2 and using the "-l".
The latest release is 2.5.4, by the way. It fixes some bugs in 2.5.2 and
2.5.3. You can get it from ftp.ee.lbl.gov.