Info Catalog flex: Can you discuss some flex internals? flex: FAQ flex: The | operator is not doing what I want

flex: unput() messes up yy_at_bol

 
 unput() messes up yy_at_bol
 ===========================
 
      To: Xinying Li <xli@npac.syr.edu>
      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.
      
      		Vern
 

Info Catalog flex: Can you discuss some flex internals? flex: FAQ flex: The | operator is not doing what I want