Re: Jumps and yyin

[Anthony DeRobertis]

On Tue, 2002-06-04 at 23:41, Bruno Ribeiro wrote:
> Hello!
> 
> I'm trying to implement jump operation, like GOTO, on my visual basic 
> interpreter. What I have done was index all the line numbers as file 
> positions.

Don't do that! Instead, build a parse tree of some sort. 

file --> LEXICAL ANALYZER --> tokens --> PARSER --> tree --> INTERPRETER

This will give you a much easier and cleaner implementation, and it'll
even run faster. See just about any book on compilers or interpreters
for more; look up, e.g., "abstract syntax tree."

[ As for your yyin stuff, bison and flex do a fair amount of buffering.
  You'll have to flush all the buffers after doing that seek. Don't
  remember off hand how to do that, but I think its in the manual. ]

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