AW: Loops using flex/bison..

[Olav Groehn]

Hi Matthew,

check enclosed bison gramar (basic Interpreter)

Olav

-----Ursprüngliche Nachricht-----
Von: address@hidden [mailto:address@hidden
Auftrag von Matthew Tedder
Gesendet: Dienstag, 5. Februar 2002 21:45
An: address@hidden
Betreff: Loops using flex/bison..



Hi,

  I wrote a little interpreter that's like a bucket with a big hole in the
bottom.  I connected a flex-based lexer with a bison-based parser but don't
know how this combination is supposed to be able to support loops?

  Is there a way to do this other than having flex output pcode into an
array
and having a special program feed that to the parser?

  All I need are FOR, WHILE, and GOTO/LABEL loops..  I figured out a goofy,
but effective way to make my IF .. THEN .. conditionals execute statements
only when a condition is set.  But I feel very inefficient having to put
every single statement on the right side of bison's rules in an if(..)
condition..

  It's a little BASIC interpreter.  I have some great ideas for enhancing
it.
 I also thought about using flex to translate BASIC to C.  Would it be
possible to turn such a thing easily into a gcc front-end?

--Matthew

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