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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