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      To: "Stones, Darren" <Darren.Stones@nectech.co.uk>
      Subject: Re: You're the man to see?
      In-reply-to: Your message of Wed, 23 Jun 1999 11:10:29 PDT.
      Date: Wed, 23 Jun 1999 09:01:40 PDT
      From: Vern Paxson <vern>
 
      > I hope you can help me.  I am using Flex and Bison to produce an interpreted
      > language.  However all goes well until I try to implement an IF statement or
      > a WHILE.  I cannot get this to work as the parser parses all the conditions
      > eg. the TRUE and FALSE conditons to check for a rule match.  So I cannot
      > make a decision!!
 
      You need to use the parser to build a parse tree (= abstract syntax trwee),
      and when that's all done you recursively evaluate the tree, binding variables
      to values at that time.
 
      		Vern

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