Re: Basic Yacc Question (W. Craig Trader)
Thu, 20 Apr 1995 04:13:11 GMT

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Newsgroups: comp.compilers
From: (W. Craig Trader)
Keywords: yacc, design
Organization: Compilers Central
References: 95-04-069
Date: Thu, 20 Apr 1995 04:13:11 GMT

> > Basically I picked up the Gnu-Bison documentation and started to read
> > through it with a view to creating a pre-processor. Everything is (nearly)
> > clear to be *except* if (as in this case) you're writting an interpretter
> > instead of a compiler, how do you implement a definite-loop ?

> [I'd parse the entire program and turn it into RPN or trees, then run my
> interpreter on that. Interpreting on the fly is a losing battle for any but
> the most simple languages. -John]

There's a particularly good example of this in _The UNIX Programming
Environment_ by Kernighan & Pike (Prentice Hall, 1984) that covers building
an interpreted calculator using Yacc (and to a lesser extent, Lex).
Particularly useful is the iterative design/develop/test methodolgy they use.

      W. Craig Trader, Programmer/Analyst, Datatel, Inc. <>

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